CN111497918A - a cart - Google Patents

Abstract

The invention discloses a cart. The cart frame includes a middle frame and two sets of rear brackets arranged on the left and right sides of the middle frame. The middle frame includes a front bracket and a push rod frame. The upper part of the front bracket is connected to the pusher. The lower part of the rod frame is rotatably connected, the lower part of each rear bracket is provided with a rear wheel assembly, and the upper part of the two sets of rear brackets is respectively rotatably connected to the middle frame, when the cart frame is in the unfolded state, the left and right sides The rear brackets extend downward and outward from the upper part in the left and right directions respectively, and the two groups of rear wheel assemblies are relatively far away from the left and right directions; The rear brackets are respectively folded along the left and right directions on the left and right sides of the middle frame, and the rear wheel assemblies of the two groups are folded relatively along the left and right directions, thereby reducing the width of the folded cart frame. The structure of the cart frame is simple, the size is small after folding, and the operation is also very convenient.

Description

a cart

technical field

The present invention relates to a cart.

Background technique

The stroller plays an important role for users in daily life. For example, the stroller can be used as a child to sit and use when traveling, and some other strollers can also be used to carry heavy objects, such as golf carts. In the prior art, the structure of the cart is various, the folding principle of the frame is also different, and the shape and volume after folding are also different.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a cart with a novel structure.

In order to achieve the above object, the technical solution adopted in the present invention is: a cart, comprising a cart frame having an unfolded state and a folded state, a front wheel assembly, a rear wheel assembly, and a push cart frame for locking the cart frame In the locking mechanism in the unfolded state, the cart frame includes a middle frame and two sets of rear brackets arranged on the left and right sides of the middle frame, the middle frame includes a front bracket and a push rod frame, the The front wheel assembly is arranged at the lower part of the front bracket, the upper part of the front bracket is rotatably connected with the lower part of the push rod frame, the lower part of each group of the rear brackets is provided with the rear wheel assembly, two groups of The upper parts of the rear brackets are respectively rotatably connected to the intermediate frame,

When the cart frame is in the unfolded state, the rear brackets on the left and right sides respectively extend downward and outward from the upper part in the left and right directions, and the two groups of the rear wheel assemblies are relatively far apart in the left and right directions; When the cart frame is in the folded state, the push rod frame and the front bracket are folded together, and the two sets of the rear brackets are respectively folded on the left and right sides of the middle frame along the left and right directions. The rear wheel assemblies are relatively folded in the left-right direction.

Preferably, the upper part of the front bracket and the upper part of the push rod frame are rotatably connected around a first axis, and the upper parts of the rear brackets on both sides are each connected to the upper part of the front bracket or the upper part of the front bracket through a second axis. The lower part of the push rod frame is rotatably connected, wherein the axis line of the second shaft is inclined relative to the axis line of the first shaft, and the axis lines of the second shafts on both sides are not parallel to each other. coincide.

Further, each of the second shafts on both sides is connected to the two ends of the first shaft through a universal rotation connecting piece.

Further, the universal rotation connecting piece includes a first U-shaped connecting piece fixedly arranged on the end of the first shaft, and a second U-shaped connecting piece fixedly arranged on the end of the second shaft. , and a connecting rod, the first U-shaped connecting piece is rotatably connected to one end of the connecting rod about the third axis, and the second U-shaped connecting piece is rotatably connected to the connecting rod about the fourth axis On the other end of the , the extending direction of the third shaft and the extending direction of the fourth shaft are perpendicular to each other.

Further, the push rod frame has two push rods respectively arranged on the left and right sides of the front bracket, the upper part of the rear bracket on the left side is rotatably connected to the side of the push rod on the left side, and the right side The upper part of the rear bracket is rotatably connected to the side part of the push rod on the right side.

Further, the lower part of the push rod has a push rod connection seat, the upper part of the rear bracket has a rear connection seat, and the rear connection seat is rotatably connected with the push rod connection seat around the second axis, so The outer side surface of the push rod connection seat and the inner side surface of the rear connection seat are inclined surfaces that are in contact with each other and are perpendicular to the second axis.

Further, the locking mechanism includes a first locking mechanism disposed between the front bracket and the push rod frame for locking the two relative to each other, and a first locking mechanism disposed between the push rod and the rear bracket for locking the two relative to each other. As for the second locking mechanism that locks the two relative to each other, there are two groups of the second locking mechanism, and the first locking mechanism and the second locking mechanism are interlocked and unlocked.

As a preferred embodiment, the front bracket has two sets of front struts, between the front strut on the left and the push rod on the left, and the front strut on the right and the push rod on the right A set of the first locking mechanisms are respectively provided between the push rods, and unlocking handles for synchronously unlocking the first locking mechanisms on both sides are also rotatably provided between the two sets of the front support rods.

As a preferred embodiment, the upper part of the front strut has a front connection seat, the lower part of the push rod has a push rod connection seat, the upper part of the rear bracket has a rear connection seat, and the front connection seat is connected to the push rod connection seat. The rod connecting seat is rotatably connected around the first axis, and the rear connecting seat and the push rod connecting seat are rotatably connected around the second axis,

The first locking mechanism includes a first locking tooth plate rotatably arranged between the front connecting seat and the push rod connecting seat and capable of sliding along the axial direction of the first shaft, the first locking tooth The outer periphery of the disc has a plurality of first locking teeth spaced along the circumferential direction, the front connecting seat is provided with a plurality of first tooth slots, and the push rod connecting seat is provided with a plurality of second tooth slots, A first elastic member for driving the first locking tooth plate away from the push rod connecting seat is further provided between the push rod connecting seat and the first locking toothed plate;

The second locking mechanism includes a second locking tooth plate rotatably disposed between the rear connecting seat and the push rod connecting seat and capable of sliding along the axial direction of the second shaft, the second locking tooth The outer peripheral portion of the disc has a plurality of second locking teeth spaced along the circumferential direction, the rear connecting seat is provided with a plurality of third tooth grooves, and the push rod connecting seat is provided with a plurality of fourth tooth grooves, A second elastic member for driving the second locking toothed plate away from the rear connecting seat is further provided between the rear connecting seat and the second locking toothed plate;

When the locking mechanism is in the locked state, the shaft ends on both sides of the first locking tooth are respectively accommodated in the first tooth slot and the second tooth slot, and the shaft ends on both sides of the second locking tooth are respectively accommodated in the first tooth slot and the second tooth slot. They are respectively accommodated in the third tooth slot and the fourth tooth slot; when the locking mechanism is in the unlocked state, the first locking tooth is separated from the first tooth slot, and the second locking tooth is separated from the first locking tooth. Four tooth slots.

Further, a first unlocking block capable of sliding along the axial direction of the first shaft is arranged between the unlocking handle and the front connecting seat, and a first unlocking block is arranged on the unlocking handle for driving the first unlocking handle when rotating. An unlocking block moves toward the first locking toothed plate in the axial direction. A second unlocking block for driving the second locking toothed plate to move, wherein when the first unlocking block pushes the first locking toothed plate to slide, the second unlocking block drives the second locking toothed plate to move .

Due to the application of the above-mentioned technical solutions, the present invention has the following advantages compared with the prior art: the cart of the present invention only includes a middle frame formed by the front bracket and the push rod frame, and two sets of rear The upper parts of the two sets of rear brackets are respectively connected to the left and right sides of the middle frame respectively. When the cart frame is folded, the lower parts of the rear brackets can be relatively folded in the left and right directions when the rear bracket is rotated, thereby reducing the folding back push The width dimension of the frame of the vehicle. The frame of the stroller has a simple structure, a small size after being folded, and convenient operation, and can be used as a children's stroller or a golf cart.

Description of drawings

Accompanying drawing 1 is the perspective view of the cart in the unfolded state of the present invention;

Accompanying drawing 2 is the side view of the cart in the unfolded state of the present invention;

Accompanying drawing 3 is the perspective view during the folding process of the cart of the present invention;

4 is a side view of the cart in the folded state of the present invention;

Accompanying drawing 5 is the structural decomposition schematic diagram of the cart of the present invention;

Accompanying drawing 6 is the three-dimensional schematic diagram 1 of the center rotating joint in the cart of the present invention;

Accompanying drawing 7 is the three-dimensional schematic diagram 2 of the center rotating joint in the cart of the present invention;

8 is a schematic diagram of the internal structure of the center rotating joint when the cart frame is in an unfolded state;

9 is a schematic diagram of the internal structure of the cart frame at the center pivot joint during the folding process;

10 is a schematic diagram of the internal structure of the center rotating joint when the cart frame is in a folded state;

Among them: 1. Front bracket; 11. Front support rod; 12. Front connecting seat; 13. Shelf; 10. Front wheel assembly; 2. Rear bracket; 21. Rear connecting seat; 20. Rear wheel assembly; 3. Push Rod frame; 31, push rod; 32, push rod connection seat; 33, push handle; 4, unlock handle; 203, inclined plane;

5. The first shaft; 6. The second shaft; 7. The universal rotation connecting piece; 71, The first U-shaped connecting piece; 72, The second U-shaped connecting piece; 73, The connecting rod; 74, The third shaft; 75 8, locking mechanism; 81, the first locking tooth plate; 811, the first locking tooth; 82, the second locking tooth plate; 821, the second locking tooth; 83, the first unlocking block; 84, the first Second unlock block.

Detailed ways

The technical solutions of the present invention will be further elaborated below with reference to the accompanying drawings and specific embodiments.

Referring to the cart shown in Figures 1-4, it includes a cart frame having a deployed state and a folded state, a front wheel assembly 10, a rear wheel assembly 20, and a means for locking the cart frame in the deployed state locking mechanism.

The cart frame includes a middle frame and two sets of rear brackets 2 arranged on the left and right sides of the middle frame. The middle frame includes a front bracket 1 and a push rod frame 3 , and a front wheel assembly 10 is arranged at the lower part of the front bracket 1 , the upper part of the front bracket 1 is rotatably connected with the lower part of the push rod frame 3, the lower part of each group of rear brackets 2 is provided with a rear wheel assembly 20, and the upper parts of the two groups of rear brackets 2 are respectively rotatably connected to the middle frame. The upper part of the left rear bracket 2 is rotatably connected to the left part of the middle frame, and the upper part of the right rear bracket 2 is rotatably connected to the right part of the middle frame, and the upper part of the rear bracket 2 can be connected with the front The upper part of the bracket 1 is rotatably connected, and can also be rotatably connected with the lower part of the push rod frame 3 .

When the cart frame is in the unfolded state, as shown in FIGS. 1 and 2 , the rear brackets 2 on the left and right sides extend downwardly and outwardly from the upper part in the left-right direction, and two sets of rear wheel assemblies 20 extend in the left-right direction. When the cart frame is folded, as shown in Figure 3, the push rod frame 3 and the front bracket 1 are rotated and folded, and the two groups of rear brackets 2 are respectively moved towards the middle along the left and right directions and gradually folded in the middle frame. On the left and right sides, the two groups of rear wheel assemblies 20 are relatively folded in the left and right directions, and the folded cart frame is shown in FIG. 4 .

Specifically, as shown in FIGS. 5 to 10 , the upper part of the front bracket 1 is rotatably connected with the upper part of the push rod frame 3 around the first axis 5 , and the upper parts of the rear brackets 2 on both sides are connected to the front bracket 2 through a second axis 6 respectively. The upper part of the bracket 1 or the lower part of the push rod frame 3 are rotatably connected, wherein the axis line of the second shaft 6 is arranged obliquely with respect to the axis line of the first shaft 5, and the axis lines of the second shafts 6 on both sides are different from each other. Parallel and overlapping, see Figure 6 and Figure 7 for details.

In this embodiment, each of the second shafts 6 on both sides is connected to the two ends of the first shaft 5 through a universal rotating connecting piece 7 . The universal rotation connecting member 7 includes a first U-shaped connecting member 71 fixedly arranged on the end of the first shaft 5, a second U-shaped connecting member 72 fixedly arranged on the end of the second shaft 6, and a connecting rod 73. The first U-shaped connector 71 is rotatably connected to one end of the connecting rod 73 around the third axis 74, and the second U-shaped connector 72 is rotatably connected to the other end of the connecting rod 73 around the fourth axis 75. , the extending direction of the third shaft 74 and the extending direction of the fourth shaft 75 are perpendicular to each other. During connection, the connecting rod 73 is accommodated in the U-shaped accommodating space of the first U-shaped connecting piece 71 and the second U-shaped connecting piece 72 .

Referring to the drawings, in this embodiment, the push rod bracket 3 has two push rods 31 respectively disposed on the left and right sides of the front bracket 1 , and the upper part of the left rear bracket 2 is rotatably connected to the left push rod 31 On the side, the upper part of the right rear bracket 2 is rotatably connected to the side of the right push rod 31 . Further, the front bracket 1 also has two sets of front struts 11 , the two sets of front struts 11 are arranged at intervals and are located between the two sets of push rods 31 , and between the two sets of front struts 11 and the two sets of push rods 31 . They are connected together to rotate about the first axis 5 .

The locking mechanism 8 includes a first locking mechanism and a second locking mechanism. The first locking mechanism and the second locking mechanism are each provided with two groups. The first locking mechanism is provided between the front support rod 11 and the push rod 31 for connecting the two The second locking mechanism is provided between the push rod 31 and the rear bracket 2 to lock the two relative to each other. The first locking mechanism and the second locking mechanism are linked and unlocked. Here, between the two sets of front support rods 11 are also provided with unlocking handles 4 for synchronously unlocking the first locking mechanisms on both sides. After the first locking mechanism on the side is unlocked, the second locking mechanisms on both sides are unlocked by linkage.

5 to 10, the upper part of the front support rod 11 has a front connecting seat 12, the lower part of the push rod 31 has a push rod connecting seat 32, and the upper part of the rear bracket 2 has a rear connecting seat 21. On the left and right sides, the front The connecting seat 12 and the push rod connecting seat 32 are rotatably connected around the first axis 5 , and the rear connecting seat 21 and the push rod connecting seat 32 are rotatably connected around the second axis 6 . The outer side surface of the push rod connecting seat 32 and the inner side surface of the rear connecting seat 21 are inclined surfaces 203 that are in contact with each other, and the axis line of the second shaft 6 is perpendicular to the inclined surface 203 on the corresponding side.

The first locking mechanism includes a first locking toothed plate 81 rotatably disposed between the front connecting seat 12 and the push rod connecting seat 32 and slidable along the axial direction of the first shaft 5 . The outer circumference of the first locking toothed plate 81 The front connecting seat 12 is provided with a plurality of first tooth slots (not shown in the figure), and the push rod connecting seat 32 is provided with a plurality of second teeth A groove (not shown in the figure), a first elastic member (not shown in the figure) for driving the first locking toothed plate 81 away from the push rod connection base 32 is also provided between the push rod connecting seat 32 and the first locking toothed plate 81 ), the first elastic member may specifically be a spring. When the shaft ends on both sides of the first locking tooth 811 on the first locking tooth plate 81 are respectively accommodated in the first tooth slot and the second tooth slot, the first locking mechanism is locked so that the push rod 31 is opposite to the front support rod 11 When an external force acts to make the first locking tooth plate 81 move toward the push rod connecting seat 32 against the force of the first elastic member, so that the first locking tooth 811 is disengaged from the first tooth slot, the first locking tooth 811 is The locking mechanism is unlocked, so that the push rod 31 can rotate relative to the front support rod 11 around the first axis 5 .

The second locking mechanism includes a second locking toothed plate 82 rotatably disposed between the rear connecting seat 21 and the push rod connecting seat 32 and slidable along the axial direction of the second shaft 6 . The outer peripheral portion of the second locking toothed plate 82 There are a plurality of second locking teeth 821 distributed at intervals along the circumferential direction, a plurality of third tooth slots (not shown in the figure) are arranged on the rear connecting seat 21, and a plurality of fourth tooth slots are arranged on the push rod connecting seat 32 (not shown in the figure), a second elastic member (not shown in the figure) for driving the second locking toothed plate 82 away from the rear connection base 21 is further provided between the rear connecting seat 21 and the second locking toothed plate 82 , Specifically, the second elastic member can also be a spring. When the shaft ends on both sides of the second locking tooth 821 on the second locking tooth plate 82 are respectively accommodated in the third tooth slot and the fourth tooth slot, the second locking mechanism is locked, so that the push rod 31 and the rear bracket 2 are relatively locked When there is an external force, the second locking tooth plate 82 overcomes the force of the second elastic member and moves toward the rear connecting seat 21, so that the second locking tooth 821 is disengaged from the fourth tooth slot, the second locking mechanism That is, it is unlocked, so that the push rod 31 can rotate relative to the rear bracket 2 around the second axis 6 .

A first unlocking block 83 that can slide in the axial direction of the first shaft 5 is provided between the unlocking handle 4 and the front connecting seat 12 , and the unlocking handle 4 is provided with a first unlocking block 83 for driving the first unlocking block 83 in the axial direction toward the first axis when rotating. A driving slope (not shown in the figure) for locking the movement of the toothed plate 81, and between the push rod connecting seat 32 and the second locking toothed plate 82 is also provided to slide along the axial direction of the second shaft 6 and for driving the second The second unlocking block 84 that locks the movement of the toothed plate 82, wherein the first unlocking block 83 pushes the first locking toothed plate 81 to slide, and drives the second unlocking block 84 to push the second locking toothed plate 82 to move.

In the cart frame, the front bracket 1 further includes a shelf 13 arranged between the two sets of front struts 11 , and the front wheel assembly 10 is installed between the lower parts of the two sets of front struts 11 . In the push rod frame 3, the upper parts of the two push rods 31 are respectively bent outward and upward to extend upward, and a push rod 33 is also fixed between the upper parts of the two push rods 31 for holding use, which is not only convenient for holding and pushing. , but also makes the structure of the frame more beautiful.

In conclusion, when the frame of the cart is unfolded, as shown in Figures 1 and 2, its structure is very simple and elegant. When it is necessary to unlock the cart frame, first operate the unlocking handle 4 to unlock the locking mechanism 8, and then push the push rod frame 3 to flip forward and fold it relative to the front frame 1. At the same time, the rear supports 2 on both sides are opposite to the push rod frame 3. Rotate around the second axis 6 and gradually fold to the middle position, the two rear wheel assemblies 20 are relatively close to each other in the left and right direction, and finally, the rear brackets 2 on both sides are folded on the left and right sides of the front bracket 1 and the push rod frame 3, and the two rear The wheel assemblies 20 are folded on the left and right sides of the front wheel assembly 10 , and the cart frame is supported on the ground by the push rod frame 3 and the rear wheel assembly 20 to form self-standing, as shown in FIG. 4 . The folded cart frame has a very compact structure and takes up less space.

On the one hand, the stroller can be used as a children's stroller, and the seat pocket assembly can be installed on it. On the other hand, the cart can also be used as a cart for carrying heavy objects, especially as a golf cart. The bag can be directly placed on the shelf 13, and its structure is simple and beautiful.

The above-mentioned embodiments are only intended to illustrate the technical concept and characteristics of the present invention, and the purpose thereof is to enable those who are familiar with the art to understand the content of the present invention and implement them accordingly, and cannot limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be included within the protection scope of the present invention.

Claims (10)

1. The utility model provides a shallow, is including having shallow frame, front wheel subassembly, the rear wheel subassembly of expansion state and fold condition, and be used for with the locking mechanical system of shallow frame locking under the expansion state which characterized in that: the cart frame comprises a middle frame and two groups of rear supports which are respectively arranged at the left side and the right side of the middle frame, the middle frame comprises a front support and a push rod frame, the front wheel assembly is arranged at the lower part of the front support, the upper part of the front support is rotationally connected with the lower part of the push rod frame, the lower part of each group of rear supports is provided with the rear wheel assembly, the upper parts of the two groups of rear supports are respectively rotationally connected on the middle frame,

when the cart frame is in a spreading state, the rear brackets on the left side and the right side extend downwards and outwards in a tilting manner from the upper part of the rear brackets in the left-right direction respectively, and the two groups of rear wheel assemblies are relatively far away from each other in the left-right direction; when the cart frame is in a folded state, the push rod frame and the front support frame are mutually folded, the two groups of rear supports are respectively folded on the left side and the right side of the middle frame in the left-right direction, and the two groups of rear wheel assemblies are oppositely folded in the left-right direction.

2. The cart of claim 1, wherein: the upper portion of the front support is connected with the upper portion of the push rod frame in a rotating mode around a first shaft, the upper portions of the rear supports on the two sides are respectively connected with the upper portion of the front support or the lower portion of the push rod frame in a rotating mode through a second shaft, wherein the shaft axis of the second shaft is obliquely arranged relative to the shaft axis of the first shaft, and the shaft axes of the second shafts on the two sides are not parallel to each other and coincide with each other.

3. The cart of claim 2, wherein: the second shafts on two sides are respectively connected to two ends of the first shaft through universal rotary connecting pieces.

4. The cart of claim 3, wherein: the universal rotating connecting piece is including fixedly setting up first U type connecting piece, the fixed setting on the first axle tip are in second U type connecting piece on the second axle tip to and the connecting rod, first U type connecting piece is connected with rotating around the third axle on one end of connecting rod, second U type connecting piece is connected with rotating around the fourth axle on another tip of connecting rod, the extending direction of third axle with the extending direction mutually perpendicular of fourth axle.

5. The cart of claim 2, wherein: the push rod frame is provided with two push rods which are respectively arranged on the left side and the right side of the front support, the upper portion of the rear support on the left side is rotatably connected to the lateral portion of the push rod, and the upper portion of the rear support on the right side is rotatably connected to the right side of the push rod.

6. The cart of claim 5, wherein: the lower part of the push rod is provided with a push rod connecting seat, the upper part of the rear support is provided with a rear connecting seat, the rear connecting seat is rotatably connected with the push rod connecting seat around the second shaft, and the outer side surface of the push rod connecting seat and the inner side surface of the rear connecting seat are inclined planes which are matched, attached and contacted and vertical to the second shaft.

7. The cart of claim 5, wherein: the locking mechanism comprises a first locking mechanism arranged between the front support and the push rod frame and used for locking the front support and the push rod frame relatively, and a second locking mechanism arranged between the push rod and the rear support and used for locking the rear support and the push rod frame relatively, the number of the second locking mechanisms is two, and the first locking mechanism and the second locking mechanism are arranged in a linkage unlocking mode.

8. The cart of claim 7, wherein: the front support is provided with two groups of front supporting rods, the front supporting rod is arranged on the left side, between the push rods, on the right side, a group of first locking mechanisms are arranged between the push rods, and two groups of unlocking handles are rotatably arranged between the front supporting rods and used for unlocking the first locking mechanisms on two sides synchronously.

9. The cart of claim 8, wherein: the upper part of the front supporting rod is provided with a front connecting seat, the lower part of the push rod is provided with a push rod connecting seat, the upper part of the rear bracket is provided with a rear connecting seat, the front connecting seat and the push rod connecting seat are rotatably connected around the first shaft, the rear connecting seat and the push rod connecting seat are rotatably connected around the second shaft,

the first locking mechanism comprises a first locking fluted disc which is rotationally arranged between the front connecting seat and the push rod connecting seat and can slide along the axial direction of the first shaft, the periphery of the outer side of the first locking fluted disc is provided with a plurality of first locking teeth which are distributed at intervals along the circumferential direction, the front connecting seat is provided with a plurality of first tooth grooves, the push rod connecting seat is provided with a plurality of second tooth grooves, and a first elastic piece which is used for driving the first locking fluted disc to be far away from the push rod connecting seat is also arranged between the push rod connecting seat and the first locking fluted disc;

the second locking mechanism comprises a second locking fluted disc which is rotationally arranged between the rear connecting seat and the push rod connecting seat and can slide along the axial direction of the second shaft, a plurality of second locking teeth which are circumferentially distributed at intervals are arranged on the periphery of the outer side of the second locking fluted disc, a plurality of third tooth grooves are arranged on the rear connecting seat, a plurality of fourth tooth grooves are arranged on the push rod connecting seat, and a second elastic piece used for driving the second locking fluted disc to be far away from the rear connecting seat is further arranged between the rear connecting seat and the second locking fluted disc;

when the locking mechanism is in a locking state, shaft end parts on two sides of the first locking tooth are respectively accommodated in the first tooth groove and the second tooth groove, and shaft end parts on two sides of the second locking tooth are respectively accommodated in the third tooth groove and the fourth tooth groove; when the locking mechanism is in an unlocking state, the first locking tooth is separated from the first tooth groove, and the second locking tooth is separated from the fourth tooth groove.

10. The cart of claim 9, wherein: the unblock handle with be equipped with between the preceding connecting seat and follow the first piece that unlocks of the endwise slip of primary shaft, be provided with on the unblock handle and be used for ordering about when rotating first piece that unlocks is along the axial orientation the drive inclined plane of first locking fluted disc motion, the push rod connecting seat with still be equipped with between the second locking fluted disc and follow the endwise slip of secondary shaft just is used for ordering about the second piece that unlocks of second locking fluted disc motion, wherein first unblock piece promotes order about when first locking fluted disc slides second unblock piece promotes the motion of second locking fluted disc.

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