CN112295126A - Telescopic positive pressure type air respirator back plate device and telescopic method thereof - Google Patents
Telescopic positive pressure type air respirator back plate device and telescopic method thereof Download PDFInfo
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- CN112295126A CN112295126A CN201910695328.2A CN201910695328A CN112295126A CN 112295126 A CN112295126 A CN 112295126A CN 201910695328 A CN201910695328 A CN 201910695328A CN 112295126 A CN112295126 A CN 112295126A
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- 238000000034 method Methods 0.000 title claims abstract description 6
- 230000000670 limiting effect Effects 0.000 claims description 58
- 230000000694 effects Effects 0.000 claims description 30
- 238000010586 diagram Methods 0.000 description 12
- 230000006978 adaptation Effects 0.000 description 9
- 241000561734 Celosia cristata Species 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 210000001520 comb Anatomy 0.000 description 3
- 206010021143 Hypoxia Diseases 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B9/00—Component parts for respiratory or breathing apparatus
- A62B9/04—Couplings; Supporting frames
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Abstract
The invention discloses a telescopic positive pressure type air respirator back plate device and a telescopic method thereof, wherein the telescopic positive pressure type air respirator back plate device comprises: the movable backboard is movably connected with the main backboard; the main back plate is connected with the movable back plate through a U-shaped clamping groove; a fastening device is arranged between the main back plate and the movable back plate; the fastening device is divided into a screw fixing mode and a bayonet fixing mode. The invention discloses a telescopic positive pressure type air respirator back plate device, which adjusts the size of the back plate device through a telescopic movable back plate, so that the back plate device which flexibly extends and retracts to adjust the size according to the height of an operator can be provided, the back plate device is further adapted to operators with different heights, and the discomfort of the operator caused by the fact that the size of the back plate device is not accordant is avoided.
Description
Technical Field
The invention relates to a back plate device of an air respirator, in particular to a telescopic positive pressure type back plate device of the air respirator, and belongs to the field of security protection.
Background
The respirator is a self-sufficient open type air respirator, which is widely applied to departments such as fire control, chemical engineering, ships, petroleum, smelting, warehouses, laboratories, mines and the like, and is used for fire extinguishment, rescue and relief work and rescue work of firemen or rescue and rescue personnel under various environments such as dense smoke, toxic gas, steam or oxygen deficiency and the like.
During high-risk activities such as fire rescue, emergency rescue, industrial places and the like, operating personnel need to use the air respirator to ensure the safety during operation, and when the operating personnel enter the site, the carried air respirator is usually carried on the back plate device.
However, current backplate device size is fixed, can't provide better use experience to the operating personnel of different heights, can squat at the operating personnel even when carrying out the task, because the size of backplate device does not conform to and causes uncomfortable sense and the constraint of use to feel, and then influence the rescue.
Disclosure of Invention
The purpose of the invention is as follows: the utility model provides a scalable positive pressure air respirator backplate device to solve the above-mentioned problem that prior art exists.
The technical scheme is as follows: a scalable positive pressure air respirator back plate apparatus comprising:
the movable backboard is movably connected with the main backboard; the main back plate is connected with the movable back plate through a U-shaped clamping groove; a fastening device is arranged between the main back plate and the movable back plate; the fastening device is divided into a screw fixing mode and a bayonet fixing mode.
In further embodiment, the screw fixation mode includes at the main backplate and the criss-cross overlapping region of activity backplate, adjusts fixedly with a set of screw combination nut, it has the screw fixation hole to open on the main backplate, it has the waist hole with the screw fixation hole adaptation to open on the activity backplate, and it has the waist hole with the screw fixation hole adaptation to open screw fixation hole on the main backplate and open on the activity backplate, mainly can need not to take out the screw when removing the activity backplate, only need relax the screw can.
In a further embodiment, the screw fixing mode further includes that a waist hole is formed in the main back plate, and a screw fixing hole matched with the waist hole is formed in the movable back plate, and the waist hole is formed in the main back plate and is used for driving a screw to slide along the range of the waist hole when the movable back plate is moved, so that a cleaning effect is caused to a certain extent.
In a further embodiment, the screw fixing manner further comprises an anti-slip manner; the antiskid mode include in the main backplate with the contact surface of activity backplate be equipped with regular, the cockscomb structure with activity backplate slip direction vertically horizontal concave tooth's socket and protruding tooth's socket looks adaptation, with regular, cockscomb structure concave tooth's socket and protruding tooth's socket set up to be perpendicular with activity backplate slip direction, and with regular, cockscomb structure concave tooth's socket and protruding tooth's socket set up to transversely, can more effectual carry out the spacing effect to the activity backplate.
In a further embodiment, the anti-slip mode further comprises that a plurality of evenly distributed limiting convex ribs or limiting grooves are designed on the back plates with the waist holes and on the other sides of the contact surfaces of the two back plates.
In a further embodiment, the clamping pin fixing mode is divided into single-hole clamping pin fixing and double-hole clamping pin fixing.
In a further embodiment, the fixing mode of the single-hole bayonet lock comprises that a single limiting hole is arranged on the main back plate, and a single row of limiting holes are arranged on the movable back plate; the direction of the single-row limiting holes is parallel to the moving direction of the movable back plate.
In a further embodiment, the single-hole bayonet fixing mode further comprises that a single row of limiting holes are formed in the main back plate, and a single limiting hole is formed in the movable back plate; the direction of the single-row limiting holes is parallel to the moving direction of the movable back plate.
In a further embodiment, the fixing of the double-hole bayonet lock comprises that a single row of limiting holes are respectively arranged on two sides of the main back plate, and a single limiting hole is respectively arranged on two sides of the movable back plate; the direction of the single-row limiting holes is parallel to the moving direction of the movable back plate, the limiting holes matched with the two sides of the main back plate are designed on the two sides of the movable back plate, the main back plate and the movable back plate are fixed by using the two limiting holes, and the shaking phenomenon of the movable back plate can be reduced.
A method of telescoping a back panel apparatus of a retractable positive pressure air respirator comprises:
s1: when the screw fixing mode is used, the fastening screw penetrates through the fixing hole and the waist hole, the screw and the nut are screwed by hand or a tool for fixing, the screw or the nut are loosened, the movable back plate is adjusted to a required position, and then the screw or the nut is screwed to finish adjustment;
s2: after the screw and the nut are screwed, in order to prevent the main back plate and the movable back plate from sliding, two groups of anti-sliding modes are designed, (1) on the back plate with the waist hole and the other side of the contact surface of the two back plates, a plurality of limit raised ribs or grooves which are uniformly distributed are designed, (2) on the contact surface of the two back plates, a transverse concave tooth groove and a convex tooth groove which are regular in design and are sawtooth-shaped and vertical to the sliding direction are distributed, and the tooth grooves of the main back plate and the movable back plate are mutually matched; under the two groups of anti-skidding modes, even if the screw and the nut are not screwed too tightly, the main back plate and the movable back plate can not slide when in use;
s3: when a single-hole clamping pin fixing mode is used, when the lengths of the two back plates are adjusted in the U-shaped groove, the limiting holes between the main back plate and the movable back plate are overlapped at a certain specific position, the clamping pin penetrates through the two overlapped holes at the time of use, the two back plates cannot slide in the U-shaped clamping groove at the time, the clamping pin has an anti-falling function and can be a pin, a screw or an elastic buckle, and when the buckle is removed from the hole of any one of the main back plate or the movable back plate, the main back plate and the movable back plate are adjusted again;
s4: when using diplopore bayonet lock fixed mode, when two backplates were at U type inslot regulation length, at certain particular position, the spacing hole between main backplate and the activity backplate can appear overlapping, use the bayonet lock that can pass two overlapping holes, pass the overlapping hole of two backplates, two backplates can not slide in U type draw-in grooves again this moment, the bayonet lock is the elasticity knot that has the anti-drop function, shift out from the spacing hole of main backplate when the buckle, main backplate and activity backplate will be adjusted once more.
Has the advantages that: the invention discloses a telescopic positive pressure type air respirator back plate device, which adjusts the size of the back plate device through a telescopic movable back plate, so that the back plate device which flexibly extends and retracts to adjust the size according to the height of an operator can be provided, the back plate device is further adapted to operators with different heights, and the discomfort of the operator caused by the fact that the size of the back plate device is not accordant is avoided.
Drawings
Fig. 1 is a schematic view of the state of the expansion plate of the present invention.
Fig. 2 is a schematic structural diagram of a first embodiment and a second embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a third and a fourth embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a fifth embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a fifth embodiment of the present invention.
Fig. 6 is a six-structure diagram of the embodiment of the invention.
Fig. 7 is a schematic structural diagram of a U-shaped card slot of the present invention.
Fig. 8 is a schematic view of the anti-slip mode of the second and fourth embodiments of the present invention.
Fig. 9 is a schematic view of the anti-slip modes of the second and fourth embodiments of the present invention.
Fig. 10 is a schematic view of the anti-slip mode of the first and third embodiments of the present invention.
The reference signs are: the movable back plate comprises a movable back plate 1, a convex tooth groove 101, a main back plate 2, a concave tooth groove 201, a screw fixing hole 3, a waist hole 4, a limiting groove 401, a convex rib 402, a single limiting hole 5 and a single row of limiting holes 6.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.
Through research and analysis of the applicant, the reason for the problem (uncomfortable feeling and constraint feeling when workers use the backboard device) is that the existing backboard device is fixed in size, good use experience cannot be provided for operators with different heights, even when the operators squat down to perform tasks, the use uncomfortable feeling and the constraint feeling are caused by the fact that the size of the backboard device is not consistent, and rescue is affected.
A scalable positive pressure air respirator back plate apparatus comprising: the movable back plate comprises a movable back plate 1, a convex tooth groove 101, a main back plate 2, a concave tooth groove 201, a screw fixing hole 3, a waist hole 4, a limiting groove 401, a convex rib 402, a single limiting hole 5 and a single row of limiting holes 6.
The main backboard 2 is movably connected with the movable backboard 1, the main backboard 2 is connected with the movable backboard 1 through a U-shaped clamping groove, a fastening device is arranged between the main backboard 2 and the movable backboard 1, and the fastening device is divided into a screw fixing mode and a clamping pin fixing mode; the clamping pin fixing mode is divided into single-hole clamping pin fixing and double-hole clamping pin fixing, and the A, B, C attached drawing in figure 1 is a state schematic diagram of the backboard device.
The first embodiment is as follows: the screw fixation mode includes at main backplate 2 and the 1 criss-cross overlap region of activity backplate, adjusts fixedly with a set of screw combination nut, it has screw fixed orifices 3 to open on main backplate 2, it has the waist hole 4 with 3 adaptations of screw fixed orifices to open on activity backplate 1, and it has the waist hole 4 with 3 adaptations of screw fixed orifices to open screw fixed orifices 3 on main backplate 2 and open on activity backplate 1, mainly can need not to take out the screw when removing activity backplate 1, only need relax the screw can.
The anti-slip mode comprises that a regular and sawtooth-shaped transverse concave tooth groove 201 and a convex tooth groove 101 which are vertical to the sliding direction of the movable back plate 1 are arranged on the contact surface of the main back plate 2 and the movable back plate 1, the main back plate 2 is matched with the tooth grooves of the movable back plate 1, the regular sawtooth-shaped concave tooth groove 201 and the convex tooth groove 101 are arranged to be vertical to the sliding direction of the movable back plate 1, and the regular sawtooth-shaped concave tooth groove 201 and the convex tooth groove 101 are arranged to be transverse, the limiting effect on the movable back plate 1 can be more effectively carried out, due to the arrangement of the matching, regular, saw-tooth-shaped concave tooth grooves 201 and convex tooth grooves 101, so that when the concave tooth groove 201 is matched with the convex tooth groove 101, the contact between the main backboard 2 and the movable backboard 1 is further completed due to the interaction force between the concave tooth groove 201 and the convex tooth groove 101, and the drawing A, B in fig. 2 is a drawing showing the telescopic state of the telescopic device of the embodiment.
The second embodiment is as follows: the screw fixation mode includes at main backplate 2 and the 1 criss-cross overlap region of activity backplate, adjusts fixedly with a set of screw combination nut, it has screw fixed orifices 3 to open on main backplate 2, it has the waist hole 4 with 3 adaptations of screw fixed orifices to open on activity backplate 1, and it has the waist hole 4 with 3 adaptations of screw fixed orifices to open screw fixed orifices 3 on main backplate 2 and open on activity backplate 1, mainly can need not to take out the screw when removing activity backplate 1, only need relax the screw can.
On the backboard with the waist hole 4, on the other side of the contact surface of the two backboards, a plurality of limiting protruding ribs 402 or limiting grooves 401 which are uniformly distributed are designed, the limiting grooves 401 and the protruding ribs 402 are arranged on the two sides of the waist hole 4, the limiting grooves 401 are matched with the nuts, the diameter of the nuts is larger than that of the screws, so that when the nuts are partially embedded in the limiting grooves 401, the movable backboard 1 and the main backboard 2 are limited, the movable backboard cannot be moved at the moment, the protruding parts of the nuts are arranged outside the waist hole 4 after the nuts are screwed, when the protruding ribs 402 are abutted to the protruding parts of the nuts, the movable backboard 1 and the main backboard 2 are limited at the moment, the movable backboard cannot be moved at the moment, and the A, B in fig. 2 is a telescopic state diagram of the telescopic device of the embodiment.
The third concrete implementation mode: the screw fixing mode further comprises that a waist hole 4 is formed in the main back plate 2, the movable back plate 1 is provided with a screw fixing hole 3 matched with the waist hole 4, and the waist hole 4 is formed in the main back plate 2 and is assembled so as to drive screws to slide along the range of the waist hole 4 when the movable back plate 1 is moved, so that the cleaning effect is caused to a certain extent.
The screw fixing mode also comprises an anti-skidding mode; the antiskid mode comprises that a regular and serrated transverse concave tooth groove 201 and a serrated convex tooth groove 101 which are perpendicular to the sliding direction of the movable back plate 1 are arranged on the contact surface of the main back plate 2 and the movable back plate 1, the tooth grooves of the main back plate 2 and the movable back plate 1 are matched, the regular and serrated concave tooth groove 201 and the serrated convex tooth groove 101 are perpendicular to the sliding direction of the movable back plate 1, the regular and serrated concave tooth groove 201 and the serrated convex tooth groove 101 are arranged to be transverse, the limiting effect on the movable back plate 1 can be more effectively carried out, and the A, B attached drawing in fig. 3 is a telescopic state diagram of the telescopic device in the embodiment.
The fourth concrete implementation mode: the screw fixing mode further comprises that a waist hole 4 is formed in the main back plate 2, the movable back plate 1 is provided with a screw fixing hole 3 matched with the waist hole 4, and the waist hole 4 is formed in the main back plate 2 and is assembled so as to drive screws to slide along the range of the waist hole 4 when the movable back plate 1 is moved, so that the cleaning effect is caused to a certain extent.
The antiskid mode also comprises that a plurality of evenly-distributed limiting raised ribs 402 or limiting grooves 401 are designed on the back plates with the waist holes 4 and on the other sides of the contact surfaces of the two back plates, the limiting grooves 401 and the raised ribs 402 are arranged on the two sides of the waist holes 4, the limiting grooves 401 are matched with the nuts, and the diameters of the nuts are larger than those of the screws, so that when the nuts are partially embedded in the limiting grooves 401, the movable back plate 1 and the main back plate 2 are limited and cannot move at the moment, when the raised ribs 402 are partially abutted to the nuts, the movable back plate 1 and the main back plate 2 are limited and cannot move at the moment, and the A, B drawing in fig. 3 is a telescopic state diagram of the telescopic device of the embodiment.
The fifth concrete implementation mode: the fixing mode of the single-hole bayonet lock comprises that a single limiting hole 5 is arranged on the main back plate 2, and a single row of limiting holes 6 are arranged on the movable back plate 1; the direction of the single-row limiting holes 6 is parallel to the moving direction of the movable back plate 1.
The single-hole bayonet fixing mode further comprises that a single row of limiting holes 6 are formed in the main back plate 2, and a single limiting hole 5 is formed in the movable back plate 1; the direction of the single-row limiting hole 6 is parallel to the moving direction of the movable backboard 1, and the drawings A, B in fig. 4 and 5 are diagrams of the telescopic device of the embodiment.
The sixth specific implementation mode: the double-hole bayonet lock comprises a main back plate 2, a movable back plate 1 and a double-hole bayonet lock, wherein the two sides of the main back plate 2 are respectively provided with a single row of limiting holes 6, and the two sides of the movable back plate 1 are respectively provided with a single limiting hole 5; the direction of the single-row limiting holes 6 is parallel to the moving direction of the movable backboard 1, the limiting holes matched with the two sides of the main backboard 2 are designed on the two sides of the movable backboard 1, the main backboard 2 and the movable backboard 1 are fixed by using the two limiting holes, the shaking phenomenon of the movable backboard 1 can be reduced, and the A, B attached drawing in fig. 6 is a telescopic state diagram of the telescopic device of the embodiment.
Description of the working principle: when the screw fixing mode is used, a fastening screw penetrates through the fixing hole and the waist hole 4, the screw and the nut are screwed by hand or a tool for fixing, the screw or the nut are loosened, the movable back plate 1 is adjusted to a required position, and then the screw or the nut is screwed to finish adjustment; after screw and nut were screwed up, in order to prevent that main backplate 2 and activity backplate 1 from taking place to slide, design two sets of anti-skidding modes:
(1) on the back plate with the waist hole 4, the other sides of the contact surfaces of the two back plates are designed with a plurality of evenly distributed limiting convex ribs 402 or grooves; the limiting grooves 401 and the protruding ribs 402 are arranged on two sides of the waist hole 4, the limiting grooves 401 are matched with the nut, the diameter of the nut is larger than that of the screw, when the nut is partially embedded in the limiting grooves 401, the movable back plate 1 and the main back plate 2 are limited, the movable back plate cannot move at the moment, the protruding part of the nut is arranged on the outer side of the waist hole 4 after the nut is screwed down, when the protruding ribs 402 abut against the protruding part of the nut, the movable back plate 1 and the main back plate 2 are limited at the moment, and the movable back plate cannot move at the moment;
(2) at the contact surface of two backplates, distribution design rule, jagged with slip direction vertically horizontal concave tooth groove 201 and convex tooth groove 101, main backplate 2 is identical with the tooth groove of activity backplate 1 each other, owing to set up the adaptation of each other, regular, jagged concave tooth groove 201 and convex tooth groove 101 for because concave tooth groove 201 and convex tooth groove 101 between the mutual effort and then accomplish the contact to main backplate 2 and activity backplate 1 when carrying out the adaptation.
Under the two groups of anti-skidding modes, even if the screw and the nut are not screwed too tightly, the main back plate 2 and the movable back plate 1 cannot slide when in use;
when a single-hole bayonet lock fixing mode is used, when the lengths of the two back plates are adjusted in the U-shaped groove, the limiting holes between the main back plate 2 and the movable back plate 1 are overlapped at a certain specific position, the bayonet lock penetrates through the two overlapped holes when the single-hole bayonet lock is used, the two back plates cannot slide in the U-shaped bayonet lock, the bayonet lock has an anti-falling function and can be a pin, a screw or an elastic buckle, and when the buckle is removed from the hole of any one of the main back plate 2 or the movable back plate 1, the main back plate 2 and the movable back plate 1 are adjusted again;
when using diplopore bayonet lock fixed mode, when two backplates were at U type inslot regulation length, in certain particular position, the spacing hole between main backplate 2 and the activity backplate 1 can appear overlapping, use the bayonet lock that can pass two overlapping holes, pass the overlapping hole of two backplates, two backplates can not slide in U type draw-in grooves again this moment, the bayonet lock is the elasticity knot that has anti-drop function, shift out from the spacing hole of main backplate 2 when the buckle, main backplate 2 will be adjusted once more with activity backplate 1, because bayonet lock fixed mode itself has limit function, so will not need to use anti-skidding mode after using bayonet lock fixed mode.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the embodiments, and various equivalent changes can be made to the technical solution of the present invention within the technical idea of the present invention, and these equivalent changes are within the protection scope of the present invention.
Claims (10)
1. A scalable positive pressure air respirator backplate device, characterized by includes:
the movable backboard is movably connected with the main backboard; the main back plate is connected with the movable back plate through a U-shaped clamping groove; a fastening device is arranged between the main back plate and the movable back plate; the fastening device is divided into a screw fixing mode and a bayonet fixing mode.
2. The retractable positive pressure air respirator back plate apparatus of claim 1, wherein: the screw fixing mode comprises that a screw fixing hole is formed in the main back plate, and a waist hole matched with the screw fixing hole is formed in the movable back plate.
3. The retractable positive pressure air respirator back plate apparatus of claim 1, wherein: the screw fixing mode can also be that a waist hole is formed on the main back plate, and a screw fixing hole matched with the waist hole is formed on the movable back plate.
4. The screw fastening method according to claim 2, wherein: the screw fixing mode also comprises an anti-skidding mode; the anti-slip mode comprises that a regular and zigzag transverse concave tooth groove and a convex tooth groove which are vertical to the sliding direction of the movable back plate are arranged on the contact surface of the main back plate and the movable back plate, and the tooth grooves of the main back plate and the movable back plate are matched.
5. The retractable positive pressure air respirator back plate apparatus of claim 4, wherein: the antiskid mode can also be that a plurality of spacing protruding ribs or spacing grooves which are evenly distributed are designed on the back plate with the waist hole and on the other side of the contact surface of the two back plates.
6. The retractable positive pressure air respirator back plate apparatus of claim 1, wherein: the bayonet fixing mode is divided into single-hole bayonet fixing and double-hole bayonet fixing.
7. The retractable positive pressure air respirator back plate apparatus of claim 6, wherein: the single-hole bayonet lock fixing mode comprises that a single limiting hole is formed in the main back plate, and a single row of limiting holes are formed in the movable back plate; the direction of the single-row limiting holes is parallel to the moving direction of the movable back plate.
8. The retractable positive pressure air respirator back plate apparatus of claim 6, wherein: the single-hole bayonet lock fixing mode can also be characterized in that a single row of limiting holes are formed in the main back plate, and a single limiting hole is formed in the movable back plate; the direction of the single-row limiting holes is parallel to the moving direction of the movable back plate.
9. The retractable positive pressure air respirator back plate apparatus of claim 6, wherein: the double-hole bayonet lock comprises a main back plate and a movable back plate, wherein the two sides of the main back plate are respectively provided with a single row of limiting holes; the direction of the single-row limiting holes is parallel to the moving direction of the movable back plate.
10. A method for stretching a back plate device of a telescopic positive pressure type air respirator is characterized by comprising the following steps:
s1: when a screw fixing mode is used, a group of screws are combined with nuts to be adjusted and fixed in an overlapped area where the main back plate and the movable back plate are crossed, fastening screws penetrate through the fixing holes and the waist holes, the screws and the nuts are screwed by hands or tools to be fixed, the screws or the nuts are loosened, the movable back plate is adjusted to a required position, and then the screws or the nuts are screwed to finish adjustment;
s2: after the screw and the nut are screwed, in order to prevent the main back plate and the movable back plate from sliding, two groups of anti-sliding modes are designed, (1) on the back plate with the waist hole and the other side of the contact surface of the two back plates, a plurality of limit raised ribs or grooves which are uniformly distributed are designed, (2) on the contact surface of the two back plates, a transverse concave tooth groove and a convex tooth groove which are regular in design and are sawtooth-shaped and vertical to the sliding direction are distributed, and the tooth grooves of the main back plate and the movable back plate are mutually matched; under the two groups of anti-skidding modes, even if the screw and the nut are not screwed too tightly, the main back plate and the movable back plate can not slide when in use;
s3: when a single-hole clamping pin fixing mode is used, when the lengths of the two back plates are adjusted in the U-shaped groove, the limiting holes between the main back plate and the movable back plate are overlapped at a certain specific position, the clamping pin penetrates through the two overlapped holes at the time of use, the two back plates cannot slide in the U-shaped clamping groove at the time, the clamping pin has an anti-falling function and can be a pin, a screw or an elastic buckle, and when the buckle is removed from the hole of any one of the main back plate or the movable back plate, the main back plate and the movable back plate are adjusted again;
s4: when using diplopore bayonet lock fixed mode, when two backplates were at U type inslot regulation length, at certain particular position, the spacing hole between main backplate and the activity backplate can appear overlapping, use the bayonet lock that can pass two overlapping holes, pass the overlapping hole of two backplates, two backplates can not slide in U type draw-in grooves again this moment, the bayonet lock is the elasticity knot that has the anti-drop function, shift out from the spacing hole of main backplate when the buckle, main backplate and activity backplate will be adjusted once more.
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| CN201910695328.2A CN112295126B (en) | 2019-07-30 | 2019-07-30 | Telescopic positive pressure type air respirator back plate device and telescopic method thereof |
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| CN201910695328.2A CN112295126B (en) | 2019-07-30 | 2019-07-30 | Telescopic positive pressure type air respirator back plate device and telescopic method thereof |
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| CN112295126B CN112295126B (en) | 2022-06-14 |
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| CN112295126B (en) | 2022-06-14 |
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