US20170268843A1

US20170268843A1 - Semi-automatic firearm trigger mechanism and safety device

Info

Publication number: US20170268843A1
Application number: US15/510,978
Authority: US
Inventors: Charles K. Heizer
Original assignee: Heizer Defense LLC
Current assignee: Heizer Defense LLC
Priority date: 2013-09-13
Filing date: 2015-09-15
Publication date: 2017-09-21

Abstract

A firearm has a frame, a barrel assembly, a slide assembly which holds a recoil assembly, and a firing system with a trigger assembly and safety mechanism. The slide and recoil assemblies are located above the barrel so that the barrel is situated between the topmost part of the frame and the bottom of the slide assembly. The barrel assembly includes a housing which is covered by the slide assembly and secures one side of the recoil assembly. The barrel can be removably connected to the frame through front and rear mounts with removable pins and can modularly connect with the frame and slide assembly so that different caliber barrels can be interchanged. In addition to the trigger, the trigger assembly has a hammer, a sear, a lever arm that engages the trigger, sear and hammer, and springs that bias the trigger assembly components.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority from U.S. patent application Ser. Nos. 14/486,633 and 62/100,342 respectively filed on Sep. 15, 2014 and Jan. 6, 2015, hereby incorporated by reference.

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH

Not Applicable.

APPENDIX

Not Applicable.

BACKGROUND OF THE INVENTION

Field of the Invention
The present invention relates to a semi-automatic pistol, and more particularly to modular compact semi-automatic pistols with quick-change barrels and corresponding inserts for different caliber barrels, an improved recoil mechanism having a shock absorbing system with a spring and dampener assembly that is held in place and stopped by a housing formed above the barrel, and a firing system with a trigger assembly and safety device having reduced complexity.
Related Art
Known firearms generally experience kickback and muzzle climb due to discharge gases when the firearm is fired. Kickback is created by a forward momentum of the bullet and results in a rearward acting force upon the firearm and the marksman. Additionally, muzzle climb is caused by a torque which creates an upward movement of the barrel when the firearm is discharged. Recoil and muzzle climb typically increase with the size of the bullet or projectile. Moreover, there is typically an inverse relationship between the weight of the firearm and the kickback effects such that a lower weight firearm produces an increased kickback and muzzle climb transferred to the operator of the firearm. Kickback and muzzle climb may cause marksmen to flinch or hesitate when discharging the firearm, thereby resulting in less control of the firearm. Additionally, muzzle climb and recoil may lead to fatigue in the marksman and may inhibit the marksman's ability to repeatedly discharge the firearm. Kickback and muzzle climb can cause the marksman to move out of alignment with the target after each round is fired requiring additional setup time for each subsequent shot. As such, kickback and muzzle climb can decrease the accuracy of the marksman.
Most prior art semi-automatic pistols either have recoil mechanisms beneath the barrel or, around the barrel in some cases, and there are a few instances in which the recoil mechanisms are above the barrel. However, pistols with the recoil mechanism beneath the barrel create a higher torque from the kickback or “recoil” upon discharging the firearm due to the offset of the barrel from the position of the operator's hand. The larger the offset distance, the greater the counterforce that the operator of the firearm must exert to overcome the torque and maintain control after discharging the firearm, resulting in discomfort and increased fatigue to the operator of the firearm. In traditional semi-automatic pistols in which an ammunition magazine (or clip) slides into the butt handle of the firearm, the centerline of the barrel is offset by approximately an inch or higher than the top of the trigger and the top of the handle where the operator's hand is located. Even with compact semi-automatic pistols, nearly an inch offset is typical. None of these traditional prior art pistols have the recoil mechanism secured over the barrel by a housing positioned over the barrel or firing chamber.
Furthermore, the gun barrels in many prior art firearms move during operation of the firearm, either sliding or rotating. This movement can negatively impact the accuracy of the firearms, since this creates a floating-type moment when firing the weapon. However, as indicated in U.S. Pat. No. 747,585 it has generally been considered that the closer location of the barrel to the sighting line would result in increased accuracy. There has been a desire to replace barrels without the need for any tool, and although some barrels located above the recoil assembly have provided this ability, there has not been a firearm in which different caliber barrels could be interchanged in a modular manner so that they both work with the same frame, firing system, slide assembly and recoil mechanism.
In those firearms in which the barrel is situated below the recoil mechanism, it would be beneficial to permit the replacement of the barrel without the need for any tool. Additionally, there would be additional benefits to a barrel that is connected directly to the frame and does not move which can provide a stable, unmoving platform to hold the recoil mechanism to reduce the complexity of the firearm and minimize the moving parts in the firearm. There would also be benefits of an improved recoil mechanism with a shock absorbing system.
It would also be beneficial to provide a firing system with a trigger assembly that is compact and lightweight and that can operate with different caliber barrels. Additionally, it would be beneficial to provide a safety device for a trigger assembly that is both effective and reduces the complexity of the parts.

SUMMARY OF THE INVENTION

Embodiments of the present invention comprise a firearm with a frame, a barrel assembly, a slide assembly with a recoil mechanism, and a firing system with a trigger assembly and safety device. The slide assembly and recoil mechanism are located above the barrel assembly so that the barrel is situated between the topmost part of the frame and the bottom of the slide assembly. The barrel assembly includes a housing situated above the firing chamber which is covered by the slide assembly and secures the side of the recoil assembly proximate to the breech plate.
The firearm of the present invention is also designed to have modular barrel assemblies that are interchangeable with each other so that different caliber gun barrels can use the same frame, firing system, recoil mechanism and possibly even the same slide assembly. The modular barrel assemblies are connected to the frame with takedown pins which permit quick removal and replacement without any tools apart from the cartridges used in the firearm. The removable connection of the barrel assembly to the frame are preferably through front and rear mounts that may be secured using the removable takedown pins.
The firing system has a trigger assembly that is compact and lightweight and that can operate with different caliber barrels. The trigger assembly includes a lever arm extending between the trigger pull and the sear; the lever arm has a ram that engages a tab on the sear and an extension that engages a cam surface on the hammer. The safety device for the trigger assembly reduces the complexity of the parts from traditional safeties, using a rotating shaft which engages the sear and forces the sear into its engaged position with the hammer catch surface in a safety-on configuration; a cutout section of the shaft allows the sear to rotate away from the hammer catch surface in the firing-ready configuration.
Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. The detailed description and specific examples of the invention in the specification and drawings are intended for purposes of illustration only and are not intended to limit the scope of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become more fully understood from the detailed description and the accompanying drawings, wherein:

FIG. 1A is a cross-sectional view of a firearm of the present invention.

FIG. 1B is a partial cross-sectional view of the firearm of the present invention.

FIG. 1C is a front view of the firearm of the present invention.

FIG. 1D is a cross-sectional view of the firearm of the present invention with a variation in the sear design.

FIG. 2A is an exploded cross-sectional view of the firearm shown in FIG. 1A.

FIG. 2B is a front view of the frame of the firearm shown in FIG. 2A.

FIG. 2C is a front view of an interchangeable barrel assembly and breech plate insert for the firearm.

FIG. 3A is an exploded isometric view of the firearm of the present invention.

FIG. 3B is a detail isometric view of an alternative mount for barrel assemblies.

FIG. 3C is an isometric view of the firing system with the trigger assembly and the linear striker mechanism.

FIG. 3D is an isometric view of an alternative firing system.

FIGS. 4A-4H are a progression of views as the firearm discharges, cocks, and returns to its firing-ready position.

FIGS. 5A and 5B are cross-sectional detail views of the safety device in an engaged position and a disengaged position, respectively.

FIG. 5C is an isometric view of the safety device shown in FIGS. 5A and 5B.

FIGS. 6A and 6B are cross-sectional detail views of an alternative safety device in an engaged position and a disengaged position, respectively.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The following description of the preferred embodiment(s) is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. Generally, as shown in FIG. 1, the firearm 10 of the present invention includes a frame 12, a barrel assembly 14, a slide assembly 16 that contains a recoil mechanism 18, and a firing system 20. The slide assembly and recoil mechanism are located above the gun barrel 14 a so that the barrel is situated between the topmost part of the frame and the bottom of the slide assembly. The barrel assembly 14 includes a housing 14 b which is covered by the slide assembly 16 and secures one side of the recoil assembly 18. The firearm is operated by the firing system 20 which includes a trigger assembly 22 and linear striker mechanism 24. Details of the various features of the firearm are described below with reference to FIGS. 1-3, and the operation of the firearm is described below with reference to the drawings shown in FIGS. 4A-4H. A preferred embodiment of the firing system's safety mechanism 60 and its corresponding operation are shown in FIGS. 3C, 5A, and 5B, and an alternative safety mechanism 60′ and its operation are shown in FIGS. 3D, 6A and 6B.
The barrel assembly can be removably connected to the frame through front and rear mounts 14 c, 14 d that may be secured using removable pins 26. The barrel assembly can modularly connect with the frame and slide assembly so that different caliber barrels 14′, 14″ can be interchanged with each other using the same frame and slide assembly. When the same slide assembly is used for different caliber barrels, an insert 50 preferably mounts within a fitting 52 in the slide. It will also be appreciated that each different caliber barrel may have its own uniquely sized slide assembly to avoid the use of inserts. Additionally, it is also possible to form the barrel assembly with the frame so that they are permanently attached to each other.
The frame 12 has a handle portion 12 a and a trigger portion 12 b. The handle portion has a left side and a right side extending from the trigger portion to a butt end 12 c of the frame. The sides each have a side aperture 32 a proximate to the trigger portion and a lip 12 d that is proximate to the top end of the handle portion and extends along the top end to the butt end of the handle portion. The trigger portion has an arm 12 e extending from the handle portion and a cavity 34 recessed from a top face of the arm 12 f. A pair of sides of the arm extends from the sides of the handle portion to form a pair of side walls on opposite sides of the cavity, and each of the side walls has a side wall aperture 36 a.
The barrel assembly 14 is positioned adjacent to the top face of the arm. The barrel assembly includes a gun barrel 14 a, a housing 14 b, a front mount 14 c, and a rear mount 14 d and has a front portion 14 e, a rear portion 14 f, a top side 14 g, and a bottom side 14 h. The front and back mounts extend from the bottom side of the front and back portions, respectively. The housing 14 b extends from the top side of the gun barrel and has inner and outer surfaces 38 a, 38 b and front and back surfaces 40 a, 40 b. The top side includes a pair of longitudinal ribs 42 extending between the front portion and the rear portion. The front mount is seated in the cavity and has a front aperture 36 b aligned with the side wall aperture 36 a in each of the side walls. The rear mount is seated between the first side and the second side and has a rear aperture 32 b aligned with the side apertures 32 a. As shown in FIG. 3A, the mounts are preferably pinned. However, as particularly shown in FIG. 3B, a latch mount 28 may be used in place of either one of the pin mounts. The latch mount would engage with a catch 30 on the frame and then the pin mount would be locked in place, preferably with a takedown pin.
The takedown pin locks the barrel assembly to the frame and can be dislodged from the pin aperture using a standard caliber cartridge 44. The user can then pull the pin out of the aperture to remove the barrel assembly 14 from the frame 12. The barrel assembly 14 can interchangeably connect with the frame 12 and the slide assembly 16 in a modular manner. For example, one barrel assembly 14′ can be one caliber (0.45) while another barrel assembly 14″ can be a different caliber (9 mm), as shown in FIGS. 2B and 2C, respectively. These barrel assemblies 14 are interchangeable with each other, and the centerline 46 of each gun barrel aligns with the firing pin hole 16 g in the breech plate 16 b. As shown in FIGS. 2B and 2C, different breech plate inserts 50 may have the same outer size 50 a to mount within the fitting 52 in the slide assembly and different sized interior spacing 50 b′, 50 b″ to accommodate different caliber ammunition. For example, a thin-walled insert 50 b′ may be used to hold 45 caliber ammunition in alignment with the firing pin hole 16 g while a thick-walled insert 50 b″ corresponds with 9 mm ammunition. The centerline 46 of the gun barrels are aligned with the center of the firing pin hole in the breech plate. To lock the barrel assembly to the frame, a takedown pin 26 a extends through the aperture in the front mount and the side wall aperture in each one of the side walls. Similarly, a takedown pin 26 b extends through the aperture in the rear mount and the side apertures in the frame.
The slide assembly 16 includes a front casing 16 a, a rear casing 16 b, a breech plate 16 c, a firing pin bore 16 d, an internal recess 16 e, and a conduit 16 f between the internal recess and the rear casing. As indicated above, the breech plate has a firing pin hole 16 g aligned with the firing pin bore 16 d. The front casing extends from the internal recess to a distal end around the nose portion of the recoil rod. The front casing mates with the barrel and encloses the recoil assembly in an interior space between the front casing and the top side of the barrel. The front casing has a pair of apertures 48 at the distal end and a pair of inwardly-facing grooves 16 g extending from the distal end to a location proximate to the internal recess. The pair of longitudinal ribs slide in the pair of inwardly-facing grooves. The rear casing has a pair of outwardly-facing grooves 16 h, and the first lip and the second lip slide in the pair of outwardly-facing grooves. The back surface of the housing abuts the internal recess and the recoil assembly sleeve continues through the housing and is seated at the back wall of the internal recess.
The recoil assembly 18 includes a rod 18 a, a helical spring 18 b and a sleeve 18 c. The recoil rod 18 a has a nose portion 18 d and an elongated rod 18 e extending from the nose portion. The nose portion has a bore 18 f. The sleeve 18 c has a flange 18 g around an open end at the front and an annular rib 18 h at an opening at the back end. The elongated rod extends through an interior portion 18 i of the sleeve and projects out the opening at the back end. The helical spring 18 b surrounds the elongated rod 18 a and is contained between the nose portion and the annular rib. An outer surface 18 j of the sleeve is contained within the inner surface 38 a of the housing 14 b, and the flange 18 g abuts the front surface 40 a of the housing 14 b. The recoil assembly also preferably includes a dampener device 18 k which softens the impact of the slide as it is forced back following a discharged of a round. For example, a series of Belleville washers in a back-to-back arrangement can be situated around the rod between the spring and the nose portion so that when the slide reaches its backmost travel, the washers are compressed between the nose portion and the sleeve's flange at a slide stop formed by the housing's front surface 40 a. The recoil assembly 18 is preferably connected to the slide assembly by another takedown pin 26 c. The pin extends through the pair of apertures in the front casing of the slide assembly and through the bore in the nose portion of the recoil assembly. It will be appreciated that any standard fastener can be used to connect the recoil assembly to the slide assembly.
The firing system 20 includes a trigger assembly 22 and a linear striker mechanism 24 as particularly illustrated in FIGS. 3C and 3D. The linear striker mechanism includes the firing pin 24 a and the firing pin spring 24 b which are seated in the firing pin bore 16 d in the slide assembly 16. The linear striker mechanism may also include a bushing 54 as shown in FIGS. 2A and 3D and a tab 56 with a slot 58 to maintain the firing pin in its proper position in the firing pin bore. Different caliber rounds may have differently sized firing pins 24 a, 24 a′ and the firing pin springs 24 b, 24 b′ as shown in FIGS. 3C and 3D.
The trigger assembly 22 as shown in FIGS. 3C and 3D have many of the same components, including a hammer 22 a, a sear 22 b, a lever arm 22 c, and a trigger pull 22 d. The lever arm 22 c extends from the trigger pull to its engagement with the sear and the hammer. The trigger assembly 22 also includes a safety mechanism 60 and several springs which are described below relative to the components of the trigger assembly that the springs bias in various positions and orientations. One trigger assembly with a preferred safety mechanism 60 is shown in FIG. 3C, and another trigger assembly with an alternative safety mechanism 60′ is shown in FIG. 3D. Both versions of the trigger assembly use the same hammer design and also use a very similar sear design. The lever arm has some of the same features in both versions of the trigger assembly, but the lever arm used for the alternative safety mechanism 60′ has additional parts that are not in the preferred safety mechanism 60.
The hammer 22 a is pivotally mounted to the frame so that it rotates between its cocked orientation and its discharge orientation. The hammer has a catch surface 62 a and a cam surface 62 b which interact with the sear and lever arm as described in detail below and has a striking surface 62 c that impacts the backside 24 c of the striker mechanism 24. Generally, the sear engages the hammer's catch surface to hold the hammer in its cocked position, and the hammer's cam surface engages the lever arm to disengage it from the sear when the hammer rotates from its cocked orientation to its discharge orientation. The hammer spring 62 c biases the hammer to its discharge orientation, and the hammer disengages the lever arm from the sear to prevent fully-automatic firing of the firearm. After the lever arm is disengaged from the sear, the trigger pull must be released for the lever arm to reengage with the sear.
Both the preferred safety mechanism 60 and the alternative safety mechanism 60′ have a safety toggle switch 60 a that is located in a recess 12 g in the exterior of the frame 12. The switch connects to a shaft 60 b that extends through and is rotatable in a pair of holes 54 in the frame. Preferably, the safety mechanism is ambidextrous, having a safety switch on each end of the shaft. The switch may have a detent, such as a nub 60 a′ on its inner surface, which engages with a depression 12 h in the recess to hold the switch in the safety-on position. A user must push the switch past the detent to rotate the switch and shaft into the safety-off position. In the preferred safety mechanism, a solid portion 60 c of the shaft engages the sear and forces the sear into its engaged position with the hammer catch surface for the safety-on configuration. In this preferred version, a cutout section 60 d of the shaft allows the sear to rotate away from the hammer catch surface for the safety-off, firing-ready configuration. It will be appreciated that the particular shape of the shaft in the region of the sear could be an oblong or other irregular shape that matches with a corresponding mating surface on the sear so that the shaft surface generally serves as a cam with an engaged (safety-on) position and a disengaged (safety-off) position relative to the sear. In the alternative safety mechanism which is described in detail below, the shaft 60 b has a cam surface 60′c that engages the lever arm 22 c to force it into a safety-on configuration with the sear, the cam surface disengages from the lever arm to allow it to move into a safety-off configuration with the sear.
As shown in FIG. 3C, the sear 22 b engages the hammer 22 a with a latching position that holds the hammer in its cocked orientation. In particular, the sear has a latch 64 a which engages the catch surface when the sear is in its latching position and the hammer is in its cocked position. When the safety is off and the trigger is squeezed, i.e. moved from its rest position to its pulled position, the lever arm is actuated so that it pushes the sear to its releasing position which is where the latch falls away from the catch surface. A trigger spring 66 biases the trigger in the rest position, and the sear's latch is biased toward the catch by a sear spring 68 (see also FIG. 1D). The sear preferably includes a tab 64 b which extends from the sear's side and is acted on by the lever arm; the sear spring biases the tab toward the lever arm. When the sear is at its releasing position, the catch surface is no longer held by the latch, and the hammer spring forces the hammer to rotate from its cocked orientation to its discharge orientation. The sear also preferably includes a notch 64 c which is positioned on the back side of the sear on the opposite side from the latch 64 a and adjacent to the shaft's cutout section 60 d when the safety switch is rotated into the safety-off position. The alignment of the notch in the sear with the cutout section allows the sear to rotate from its latching position back to its releasing position.
As shown in FIG. 3D, the trigger assembly with the alternative safety mechanism has a sear 22 b component with slightly different features. In this embodiment, the search also has the latch 64 a and the tab 64 b. However, instead of a notch on the back of the sear as in the embodiment shown in FIG. 3C, the sear has a safety catch 64 d that extends from the same side of the sear as the tab 64 b to interact with the lever arm 22 c when the safety is on.
As shown in FIGS. 3C and 3D, the lever arm 22 c interacts with and directly contacts the trigger 22 d, the sear 22 b, and the hammer 22 a. The lever arm is rotatably connected to the trigger through a pivot pin 82 and has a ram 72 a and an extension 72 b through which the lever arm engages the other components of the trigger assembly. In the lever arm's ready position, the ram engages the tab and the ram uses the tab to push the sear back so that the latch is pushed away from the hammer catch. The lever arm is biased up toward the hammer by the lever arm spring 74 so that the extension contacts the hammer's cam surface. In the lever arm's firing position, the hammer's cam surface engages the extension and forces the lever arm down as the hammer rotates from its cocked orientation to its discharge orientation, and this also causes the ram to disengage from the sear's tab. After the firearm discharges and the recoil mechanism begins cocking the hammer back, the cam surface rotates back with the hammer and allows the lever spring arm to bias the lever arm up back toward the tab on the sear. In the semi-automatic mode of operation, an interference between the tab and the ram prevents the tab and ram from reengaging while the trigger remains depressed, even when the hammer is latched and the slide returns to chamber another round. When the trigger is released, the trigger spring biases the trigger and lever arm forward which brings the ram past the interference, thereby allowing the lever arm to return to its fully upward position in which the ram engages the tab to permit another triggering sequence to discharge the cartridge.
According to the embodiment of the invention shown in FIG. 3D, the lever arm can also have a hook 72 c, a notch 72 d and a projection 72 e. When the hammer is in its discharge orientation, the hammer's cam surface 62 b pushes the lever arm down so that the notch in the lever arm is forced onto a firing detent 70 which prevents the lever arm and trigger from resetting at the same time that the firearm is being discharged. In the firing ready operation, the hammer cocking action allows the lever arm up off of the firing detent. In the lever arm's safety position for this embodiment, the safety's cam pushes the lever arm down so that the safety notch is on the safety detent and the hook is around the safety catch. The safety notch/detent engagement prevents the trigger from moving from its rest position to its pulled position, and the hook/catch safety engagement prevents the sear from moving from its latching position to its releasing position. Due to weight and/or space limitations or to place the toggle bar in a quick release location on the handle, the cam may be offset from the top side of the lever arm. Accordingly, the lever arm may include the projection 72 e to contact the safety's cam that adjusts for the offset.
While one of ordinary skill in the art would generally understand the semi-automatic firearm's cycle of operation, a general cycle and its constituent phases are described below, starting with a cartridge feeding phase after a round has been fired from the pistol. The cartridge feeding phase involves the upward movement of cartridges in a magazine 76 loaded into the pistol. This upward movement of cartridges is generally accomplished by a follower and a spring positioned within magazine. However, other methods of cartridge feeding may be used to move the rounds upward into the path of the pistol's slide by the magazine follower and spring assembly. The feeding phase may also include a ramping action that occurs as the pistol slide moves forward and starts to strip a cartridge forward from the magazine. It is important to note that, in many pistols, the barrel is not stationary with the frame of the pistol, but instead moves forward and backward during the entire cycle of operation, i.e., a floating barrel.
A cartridge chambering phase occurs next in the cycle of operation, where a cartridge is stripped from the magazine and placed into the chamber of the pistol. This stripping action occurs as the slide moves forward under compressed recoil spring pressure, which in turn pulls a cartridge from the magazine. The combined movement of the slide and the upward pressure of the follower/spring assembly in magazine push the cartridge up a frame/barrel ramp and into the chamber. In many prior art pistols, the front muzzle end of the barrel angles upward and the rearward firing chamber end of the barrel angles downward during this phase to effect the chambering of a cartridge. In the present invention, the barrel remains fixed with the frame and may even be integrally formed with the frame.
Next, the pistol enters a locking phase in which the cartridge is locked into place in the barrel with the firing mechanism at the rear of the cartridge. In the semi-automatic pistols in which the barrel rotates, the barrel and slide are held in place relative to the frame during this phase. As indicated above, according to one aspect of the present invention, the barrel remains fixed in place and does not move, and the slide is locked into position relative to both the barrel and the frame.
The cycle of operation then “suspends” at this stage, until an operator of the pistol pulls the pistol trigger, at which time the cycle of operation enters into a firing phase. A triggering mechanism releases a striker or another form of a hammer, whereby the striker transfers its energy to the firing pin, which, in turn, strikes the primer. The primer ignites the propellant charge in the chambered cartridge. The gas created by the ignited propellant charge expands behind the bullet, forcing the bullet away from the cartridge casing and down the barrel. Generally, the barrel and slide remain in position during this initial portion of the firing phase. In the final portion of the firing phase, the bullet exits the barrel through a muzzle and the gas pressure within the barrel drops. At this point, the inertial thrust of the exiting bullet imparts an equal rearward force on the slide assembly. As a result, the slide assembly moves rearward as the recoil spring assembly absorbs this “recoil” energy. It should be noted that the prior art pistols position the recoil spring beneath their respective floating barrels, the significance of which is discussed below.
At this point, the pistol enters an unlock phase, where the slide “unlocks”, “unlinks” or otherwise disengages from the barrel and frame, such that the slide can move relative thereto. The next phase, the fired cartridge case extraction phase, often occurs during this phase due to the breaking of friction between the expended cartridge case and the chamber wall. During the fired cartridge case extraction phase, the slide continues moving rearward and the breech opens. The rim of the fired cartridge case remains firmly in place, such as by an extractor and the continued rearward motion of the slide extracts the cartridge casing from the barrel. Finally, during the fired cartridge case ejection phase, the fired cartridge case is ejected through an ejection port. During the ejection, the cartridge case may be pivot upward and to one side which can free the case from the extractor. Finally, the pistol enters a cocking phase, whereby the striker and firing mechanism are positioned to fire the next cartridge. Generally, this occurs during the continued rearward motion of the slide.
The operational sequence of firing the pistol and automatic reloading is shown in FIGS. 4A-4H. The firing-ready rest position is shown in FIG. 4A. As indicated above, in this position, the cutout section 60 d of the shaft is rotated towards the notch 64 c in the sear. When the safety switch is rotated into the safety-off position, the notch is positioned adjacent to the cutout section which allows the sear to rotate away from the hammer catch surface. With the safety off, the sear can rotate from its latching position back to its releasing position.
The firing-ready cocked position is shown in FIG. 4B. In this position, the sear is brought to its break point. The trigger pull is pressed inwardly, and the lever arm ram pushes the sear tab to the sear break point in which the sear latch is at the edge of the hammer catch. Also, at the sear break point, the lever arm extension engages the hammer cam. If the trigger pull is released, the trigger assembly returns to the rest position, with the trigger and lever arm being biased forward by the trigger spring, the lever arm remaining biased upward by the lever arm spring and the sear being biased forward by sear spring. Any further pull on the trigger causes the sear to release the hammer as shown in FIG. 4C. With the trigger pressed fully inward, the lever arm ram pushes the sear tab over the sear break point so that the sear latch moves past the edge of the hammer catch. The hammer spring forces the hammer to rotate around its pivot. The hammer cam forces the lever arm extension down and disengages the lever arm ram from the sear tab. As shown in FIG. 4D, the hammer rotates fully to hit the linear striker which propels the firing pin into the primer of the cartridge, discharging the round and firing the bullet.
As shown in FIGS. 4E and 4F, the discharge of the cartridge results in a reaction force being applied through its base against the breach plate. The slide is forced back, and the hammer is cocked while the spent shell is ejected out of the cartridge firing chamber. The slide bearing surface pushes the hammer so that it rotates back around its pivot. As the hammer rotates back, the hammer cam also rotates and allows the lever arm extension up, and the lever arm spring biases the lever arm up. The lever arm spring pushes the lever arm up against the sear tab while the trigger remains pressed inward, but the ram may not fully engage the sear tab until the trigger pull is released. The slide fully cocks the hammer, and the next cartridge in the clip is auto-loaded into the firing chamber. As the slide bearing surface fully cocks the hammer, and the sear spring biases the sear to its forward most position so that the sear latch engages the hammer catch.
As shown in FIGS. 4G and 4H, the recoil spring biases the slide forward and returns the slide to the firing ready position. When the trigger pull is released, the trigger and lever arm are biased forward by the trigger spring. The lever arm spring pushes the lever arm up further to engage the sear tab. As the slide returns to the firing ready position, the auto-loaded round from the magazine is seated in the insert with the base of the cartridge abutting against the breech plate and the shell and bullet forced into the cartridge firing chamber. When there are no additional rounds in the magazine, the clip may hold the slide open. A loaded magazine can be inserted into the handle and the safety can be released to chamber the first round.
The preferred safety device in an engaged position and a disengaged position are respectively shown in FIGS. 5A and 5B. As explained above, in the safety-on configuration, a solid portion 60 c of the shaft engages the sear and forces the sear into its engaged position with the hammer catch surface. In the safety-off, firing-ready configuration, a cutout section 60 d of the shaft allows the sear to rotate away from the hammer catch surface. The shaft preferably extends between both sides of the frame, and the cutout section in the center portion of the shaft is bounded by the cylindrical shaft at both ends.
The alternative safety device in an engaged position and a disengaged position are respectively shown in FIGS. 6A and 6B. In FIG. 6A, the safety lock is engaged so that the pistol's firing system is in a non-firing arrangement. In this arrangement, the safety switch cam rotates down and pushes the lever arm down, and the sear safety hook engages the sear safety catch. With the lever arm pushed down in its lowered position, the trigger safety notch on the lever arm engages the trigger safety detent in the side of the frame. Additionally, with the lever arm in its lowered position, the lever arm ram is disengaged from the sear tab. The firing-ready rest position is shown in FIG. 6B. In this position, the safety switch rotates the safety cam up so that the safety is off. With the safety off, the lever arm spring biases the lever arm up so that the sear safety hook is disengaged from the sear safety catch and the trigger safety notch is disengaged from the trigger safety detent. When the lever arm moves up, the lever arm ram engages the sear tab.
The position of the recoil assembly above the barrel assembly permits the barrel of the gun to be positioned closer to the trigger and thereby closer to the operator's hand that is holding the firearm at the handle grip. Generally, the offset distance 78 between barrel's centerline 46 and the top portion of the trigger 80 is less than a diameter of the barrel (D). The barrel's centerline 46 or the bottom of the barrel can be positioned at or less than approximately one-half inch (<½″) from the trigger pull's topmost exposed portion 80 at the top of the trigger guard. The small offset is possible even with a barrel that handles 45 caliber ammunition, having a bullet diameter of approximately 0.452″ and a base diameter of approximately 0.476″.
The closer proximity of the barrel centerline to the trigger pull and the top of the handle reduces the moment arm between the location where the kickback force pushes against the firearm, i.e., within the barrel, and where the operator of the firearm must exert a force to stabilize the firearm, i.e., at the handle grip and trigger. A smaller moment arm can significantly reduce the torque that an operator must overcome in holding the firearm as it is discharged, thereby allowing for much more accuracy in successive shots that are then fired. For example, for a typical semi-automatic pistol that has a recoil energy of approximately 4,500 in-lb, a barrel-to-handgrip distance of an inch or more would result in over 4,500 in-lb in torque that the operator must overcome. Even for a compact semi-automatic pistol, a barrel-to-handgrip distance that is a little less than an inch or around ⅞″ would result in approximately 4,000 in-lb in torque. In comparison, with the top-mounted recoil mechanism of the present invention in a traditional semi-automatic pistol design, the barrel-to-handgrip offset can be brought to within approximately one-half inch (½″) or less which would reduce the torque to less than 2,250 in-lb.
Modifications to the exemplary embodiments without departing from the scope of the invention, and all matter contained in the foregoing description and shown in the accompanying drawings are illustrative rather than limiting. For example, it is within the invention's scope to incorporate any known firing pin block which is directly connected to the trigger and prevents or otherwise stops the firing pin from extending into the cartridge firing chamber and contacting the cartridge primer except when the trigger is pulled, such as described in U.S. Pat. No. 3,830,002 and which is incorporated by reference herein. Thus, the invention's scope is not limited by any of the above-described exemplary embodiments, and is defined only in accordance with the following claims appended hereto and their equivalents.

Claims

1-20. (canceled)

21. A firearm for discharging ammunition, comprising:

a frame comprising a handle;

a barrel assembly connected to the frame;

a hammer pivotally mounted to the frame, wherein the hammer comprises a catch surface and a cam surface;

a hammer spring biasing the hammer to a discharge orientation;

a trigger having a rest position and a pulled position;

a sear comprising a latch on a front end and a tab extending from a side surface, wherein the sear has a latching position with the latch engaging the catch of the hammer and holding the hammer in a cocked orientation, wherein the sear has a releasing position with the latch disengaged from the catch, and wherein the hammer rotates from the cocked orientation to the discharge orientation when the sear moves from the latching position to the releasing position; and

a lever arm connecting the trigger to the sear, the lever arm comprising a ram and an extension, wherein the lever arm has a ready position and a firing position, wherein the ram engages the tab when the lever arm is in the ready position, wherein the cam surface of the hammer engages the extension when the lever arm is in the firing position, and wherein the cam surface forces the ram to disengage from the tab as the hammer rotates from the cocked orientation to the discharge orientation.

22. The firearm of claim 21, further comprising a safety mechanism comprising a safety switch and a shaft extending through the frame proximal to the sear, wherein the safety switch is connected to the shaft and rotates the shaft in the frame between a safety-on position and a safety-off position, wherein the shaft comprises a cutout section, wherein the cutout section is adjacent to a portion of the sear when the shaft is in the safety-off position and wherein the portion of the sear fits within the cutout section in the safety-off position, and wherein the cutout section is rotated away from the sear in the safety-on position.

23. The firearm of claim 21, wherein the barrel assembly comprises a gun barrel, a front mount, a rear mount and a housing, wherein the barrel assembly has a front portion, a rear portion, a top side, and a bottom side, wherein the front mount extends from the bottom side of front portion and connects to the frame, wherein the rear mount extends from the bottom side of the rear portion and connects to the frame, wherein the housing extends from the top side of the gun barrel and has an inner surface and a front surface, wherein the top side is further comprised of a pair of longitudinal ribs extending between the front portion and the rear portion.

24. The firearm of claim 23, further comprising a recoil assembly and a slide assembly, the recoil assembly comprising a rod, a helical spring and a sleeve, wherein the recoil rod comprises a nose portion and an elongated rod extending from the nose portion, wherein the sleeve has a flange around a first open end and an annular rib at a second open end, wherein the elongated rod extends through an interior portion of the sleeve and projects out the second open end, wherein the helical spring surrounds the elongated rod and is contained between the nose portion and the annular rib, wherein an outer surface of the sleeve is contained within the inner surface of the housing, wherein the flange abuts the front surface of the housing, wherein the slide assembly comprises a front casing, an internal recess, a breech plate, a rear casing, a firing pin bore, and a conduit between the internal recess and the rear casing, wherein the front casing extends from the internal recess to a distal end around the nose portion of the recoil rod, wherein the front casing mates with the barrel and encloses the recoil assembly in an interior space between the front casing and the top side of the barrel, wherein the distal end of the front casing is fixedly connected to the nose portion of the recoil assembly, wherein the breech plate has a firing pin hole aligned with the firing pin bore, wherein the front casing is slidably connected to the top side of the barrel, and wherein the rear casing is slidably connected to the frame.

25. The firearm of claim 24, wherein the recoil assembly further comprises a dampener situated between the spring and the nose portion of the recoil rod, and wherein the barrel assembly is located between the slide assembly and the frame.

26. The firearm of claim 23, further comprising a first takedown pin and a second takedown pin, wherein the frame is further comprised of an arm and a pair of sidewalls, wherein the arm extends from the handle and a cavity is recessed from a top face of the arm, wherein the pair of sidewalls is situated between the arm and the handle, wherein the arm has a first pair of apertures extending through the aperture, wherein the pair of sidewalls have a second pair of apertures, wherein the front mount is seated in the cavity and has a front aperture aligned with first pair of apertures, wherein the first takedown pin extends through the front aperture and the first pair of apertures, wherein the rear mount is seated between the pair of sidewalls and has a rear aperture aligned with the second pair of apertures, and wherein the second takedown pin extends through the rear aperture and the second pair of apertures.

27. The firearm of claim 21, further comprising a lever arm spring operatively connected to the lever arm, wherein the lever arm spring biases the lever arm towards the hammer.

28. The firearm of claim 27, further comprising a safety mechanism, wherein the safety mechanism comprises a safety switch, a shaft, and a cam, wherein the shaft connects to the safety switch at a proximal end, extends through the frame proximal to the lever arm, and connects to the cam on an interior side of the frame, wherein the safety mechanism has a first orientation and rotates to a second orientation, wherein the lever arm further comprises a hook, a notch, and a projection, wherein the cam engages the projection in the second orientation and forces the lever to a locked position with the ram disengaged from the tab, with the notch positioned over a firing detent proximate to the interior side of the frame, and with the hook engaged around a safety catch extending from the side surface of the sear.

29. The firearm of claim 21, further comprising a second barrel assembly and at least one insert, wherein the slide has a firing pin hole in a breech plate and a fitting in the breech plate around the pin hole at a location proximate to a chamber section of the barrel assembly, wherein the insert is mounted in the fitting, wherein the insert accommodates a second caliber of ammunition corresponding with the second barrel assembly, and wherein the barrel assembly corresponds with a first caliber of ammunition different from the second caliber.

30. A firearm for discharging ammunition, comprising:

a frame comprising a handle;

a barrel assembly connected to the frame;

a hammer pivotally mounted to the frame;

a hammer spring biasing the hammer to a discharge orientation;

a trigger having a rest position and a pulled position;

a sear having a first position and a second position, wherein the sear holds the hammer in a cocked orientation when in the first position, and wherein the sear disengages from holding the hammer in the second position and releases the hammer to its discharge orientation;

a lever arm connecting the trigger to the sear, wherein a movement of the trigger from the rest position to the pulled position moves the sear from its first position to its second position; and

a safety mechanism comprising a safety switch and a shaft extending through the frame proximal to the sear, wherein the safety switch is connected to the shaft and rotates the shaft in the frame between a safety-on position and a safety-off position, wherein the shaft comprises a cutout section, wherein the cutout section is adjacent to a portion of the sear when the shaft is in the safety-off position and wherein the portion of the sear fits within the cutout section in the safety-off position, and wherein the cutout section is rotated away from the sear in the safety-on position.

31. The firearm of claim 30, further comprising a second barrel assembly and at least one insert, wherein the slide has a firing pin hole in a breech plate and a fitting in the breech plate around the pin hole at a location proximate to a chamber section of the barrel assembly, wherein the insert is mounted in the fitting, wherein the insert accommodates a second caliber of ammunition corresponding with the second barrel assembly, and wherein the barrel assembly corresponds with a first caliber of ammunition different from the second caliber.

32. The firearm of claim 30, wherein the hammer comprises a catch surface and a cam surface, wherein the sear comprises a latch on a front end and a tab extending from a side surface, wherein the latch engages the catch of the hammer in the first position to hold the hammer in the cocked orientation, wherein the latch is disengaged from the catch in the second position, and wherein the hammer rotates from the cocked orientation to the discharge orientation when the sear moves from the first position to the second position.

33. The firearm of claim 32, wherein the lever arm further comprises a ram and an extension, wherein the lever arm has a ready position and a firing position, wherein the ram engages the tab when the lever arm is in the ready position, wherein the cam surface of the hammer engages the extension when the lever arm is in the firing position, and wherein the cam surface forces the ram to disengage from the tab as the hammer rotates from the cocked orientation to the discharge orientation.

34. The firearm of claim 30, further comprising a recoil assembly and a slide assembly, wherein the barrel assembly is located between the slide assembly and the frame, and wherein the recoil assembly is located within the slide assembly.

35. The firearm of claim 30, further comprising a recoil assembly and a slide assembly, wherein the recoil assembly further comprises a recoil rod with an elongated rod and a nose portion, a spring situated around the elongated rod, and a dampener situated between the spring and the nose portion of the recoil rod.

36. A firearm for discharging ammunition, comprising:

a frame comprising a handle;

a barrel assembly connected to the frame;

a hammer spring biasing the hammer to a discharge orientation;

a trigger having a rest position and a pulled position;

a sear comprising a latch on a front end and a tab extending from a side surface, wherein the sear has a latching position with the latch engaging the catch of the hammer and holding the hammer in a cocked orientation, wherein the sear has a releasing position with the latch disengaged from the catch, and wherein the hammer rotates from the cocked orientation to the discharge orientation when the sear moves from the latching position to the releasing position;

a lever arm connecting the trigger to the sear, the lever arm comprising a ram and an extension, wherein the lever arm has a ready position and a firing position, wherein the ram engages the tab when the lever arm is in the ready position, wherein the cam surface of the hammer engages the extension when the lever arm is in the firing position, and wherein the cam surface forces the ram to disengage from the tab as the hammer rotates from the cocked orientation to the discharge orientation; and

37. The firearm of claim 36, further comprising a second barrel assembly and at least one insert, wherein the slide has a firing pin hole in a breech plate and a fitting in the breech plate around the pin hole at a location proximate to a chamber section of the barrel assembly, wherein the insert is mounted in the fitting, wherein the insert accommodates a second caliber of ammunition corresponding with the second barrel assembly, and wherein the barrel assembly corresponds with a first caliber of ammunition different from the second caliber.

38. The firearm of claim 36, further comprising a recoil assembly and a slide assembly, wherein the barrel assembly is located between the slide assembly and the frame.

39. The firearm of claim 36, further comprising a recoil assembly and a slide assembly, wherein the recoil assembly further comprises a recoil rod with an elongated rod and a nose portion, a spring situated around the elongated rod, and a dampener situated between the spring and the nose portion of the recoil rod.

40. The firearm of claim 30, further comprising a recoil assembly and a slide assembly, the recoil assembly comprising a rod, a helical spring and a sleeve, wherein the recoil rod comprises a nose portion and an elongated rod extending from the nose portion, wherein the sleeve has a flange around a first open end and an annular rib at a second open end, wherein the elongated rod extends through an interior portion of the sleeve and projects out the second open end, wherein the helical spring surrounds the elongated rod and is contained between the nose portion and the annular rib, wherein an outer surface of the sleeve is contained within the inner surface of the housing, wherein the flange abuts the front surface of the housing, wherein the slide assembly comprises a front casing, an internal recess, a breech plate, a rear casing, a firing pin bore, and a conduit between the internal recess and the rear casing, wherein the front casing extends from the internal recess to a distal end around the nose portion of the recoil rod, wherein the front casing mates with the barrel and encloses the recoil assembly in an interior space between the front casing and the top side of the barrel, wherein the distal end of the front casing is fixedly connected to the nose portion of the recoil assembly, wherein the breech plate has a firing pin hole aligned with the firing pin bore, wherein the front casing is slidably connected to the top side of the barrel, and wherein the rear casing is slidably connected to the frame.