Locking and unlocking device for rear foot bar and backrest vertical pipe

Abstract

The utility model discloses a locking and unlocking device for a rear foot rod and a backrest vertical pipe, comprising a rear foot rod inclined from the back to the front, a backrest vertical pipe, a plastic head, a lock hook plate, a transverse locking rod, and an elastic device; the inner side wall of the bottom section of the rear foot rod is movably connected to the bottom of the lock hook plate; the inner side wall of the bottom section of the backrest vertical pipe is movably connected to the lower part of the upper section of the lock hook plate; the bottom section of the backrest vertical pipe is movably connected with a transverse locking rod, the transverse locking rod can move up and down, the elastic device is connected to the inside of the backrest vertical pipe, and the elastic device and the transverse locking rod are connected. The rod is pressed against the top to connect, so that the horizontal locking rod forms an upward and downward compression elastic activity; a hook hole is opened on the upper top of the lock hook plate, and the mouth of the hook hole faces downward; the horizontal locking rod falls into the hook hole to hook and lock the rear foot rod and the vertical tube of the backrest, and vice versa to unlock; the horizontal locking rod of this product automatically falls into the hook hole, and the lock hook plate will not automatically fall off after hooking the horizontal locking rod through the hook hole, and its hooking is firm and stable; when unlocking, press the horizontal locking rod with your hand or foot, and the horizontal locking rod will fall out of the hook hole, and it is easy to unlock.

Description

Technical Field

[0001] The utility model relates to wheelchair components, in particular to a locking and unlocking device for a rear foot rod and a backrest vertical pipe. Background Art

[0002] For example: Chinese patent document publication number: CN220778553U discloses a folding wheelchair, including a front tripod, a rear tripod, a seat, and a backrest. The rear tripod is tilted forward, the top of the front tripod is hingedly connected to the top of the rear tripod, the back of the front section of the seat is hingedly connected to the top of the rear tripod, the rear of the seat is hingedly connected to the middle section of the backrest, the left and right bottoms of the front tripod are connected to front casters, the left and right bottoms of the rear tripod are connected to rear casters, and a linked folding device is hingedly connected between the bottom of the backrest and the front tripod; the left and right bottoms of the backrest are detachably supported and connected to the left and right tops of the middle section of the rear tripod; the folding wheelchair also includes The lower left hinge piece and the lower right hinge piece; the left and right sides of the lower section of the rear leg are hingedly connected to the corresponding bottom of the lower left hinge piece and the lower right hinge piece; the left and right bottom sides of the backrest are hingedly connected to the corresponding upper sections of the lower left hinge piece and the lower right hinge piece; a locking and unlocking device is provided between the bottom section of the backrest and the corresponding top of the lower left hinge piece and the lower right hinge piece; after the wheelchair is unfolded, the left and right bottom sides of the backrest are connected with the left and right top sides of the middle section of the rear leg in a contact support manner, the rear leg supports the backrest, and the left and right bottom sides of the backrest are locked with the corresponding lower left hinge piece and the lower right hinge piece through the locking and unlocking device; after the locking and unlocking device is unlocked, the wheelchair can be folded.

[0003] The above-mentioned foldable wheelchair has a locking and unlocking device between the backrest and the rear legs. The wheelchair is locked after being unfolded through the locking and unlocking device. The wheelchair can only be folded after the locking and unlocking device is unlocked. The structural design of the locking and unlocking device is complex, and the coordination between the backrest, the hinge plate, and the rear legs is not good enough. After locking, the locking is not firm and stable enough; and unlocking is relatively laborious. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a locking and unlocking device for a rear foot rod and a backrest vertical pipe, which has a reasonable structural design, a firm hook connection, and is easy to unlock.

[0005] The solutions to the above technical problems are:

[0006] A locking and unlocking device for a rear foot rod and a backrest vertical tube belongs to a wheelchair component, comprising a rear foot rod tilted from the back to the front, a backrest vertical tube, a plastic head, a lock hook plate, a horizontal locking rod, and an elastic device. A plastic head is fixed to the bottom of the backrest vertical tube, and the plastic head and the rear foot rod can be connected in a press-contact manner. The plastic head and the rear foot rod can be separated. The inner side wall of the bottom section of the rear foot rod is movably connected to the bottom of the lock hook plate; the inner side wall of the bottom of the backrest vertical rod is movably connected to the lower part of the upper section of the lock hook plate; the bottom section of the backrest vertical tube is movably connected to the horizontal locking rod The locking rod and the transverse locking rod can move up and down, and the elastic device is connected to the inside of the backrest vertical tube. The elastic device is connected to the transverse locking rod with pressure, so that the transverse locking rod can form an up and down compression elastic movement; the upper top of the lock hook plate is provided with a hook buckle opening, and the opening of the hook buckle opening faces downward; when the plastic head presses the rear foot rod, the transverse locking rod falls into the hook buckle opening to hook and lock the rear foot rod and the backrest vertical tube; the transverse locking rod comes out of the hook buckle opening to unlock the rear foot rod and the backrest vertical tube. After unlocking, the backrest vertical tube can be flipped and folded relative to the rear foot rod, and the plastic head moves synchronously with the backrest vertical tube.

[0007] The beneficial effects of the locking and unlocking device of the rear foot rod and the backrest vertical tube of the present invention are as follows: 1. The rear foot rod, the backrest vertical tube and the locking hook plate of this product are movably connected in a coordinated manner, the movable connection is stable, and has a coordinated movable positioning function; 2. The hook mouth, the transverse locking rod and the elastic device are locked and unlocked in a coordinated manner; when the backrest vertical tube is unfolded and erected, the locking hook plate moves synchronously, and the transverse locking rod automatically falls into the hook mouth. After the locking hook plate hooks the transverse locking rod through the hook mouth, it will not automatically come off, and the hooking is firm and stable; when unlocking, press the transverse locking rod with your hand or foot, and the transverse locking rod will fall out of the hook mouth, and it is easy to unlock. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a three-dimensional diagram of the utility model product with the horizontal locking rod falling into the hook buckle mouth and locked;

[0009] Figure 2 This is a three-dimensional diagram of the utility model product with the horizontal locking rod out of the hook and buckle mouth and unlocked;

[0010] Figure 3 This is a three-dimensional diagram of the backrest vertical tube in the flipped and folded state after the utility model is unlocked;

[0011] Figure 4 This is a three-dimensional diagram of the utility model product, in which the lock hook plate is disassembled, the bottom of the backrest vertical tube is fixedly connected to the plastic head, the plastic head presses on the rear foot rod, and the rear foot rod supports the plastic head and the backrest vertical tube;

[0012] Figure 5 This is a disassembled diagram of the product of this utility model.

[0013] Rear foot rod 1, backrest vertical tube 2, vertical long hole 21, plastic head 3, lock hook plate 4, hook mouth 41, horizontal locking rod 5, elastic device 6, pressure return spring 61. DETAILED DESCRIPTION

[0014] A locking and unlocking device for a rear foot rod 1 and a backrest vertical tube 2 belongs to a foldable wheelchair component and is used for a foldable wheelchair. It includes a rear foot rod 1 tilted from back to front, a backrest vertical tube 2, a plastic head 3, a locking hook plate 4, a transverse locking rod 5, and an elastic device 6; the outer contour of the locking hook plate 4 is triangular; the rear foot rod 1 is made of an aluminum tube or an iron tube; the backrest vertical tube 2 is made of an aluminum tube or an iron tube; the locking hook plate 4 is made of aluminum, iron, or stainless steel; the transverse locking rod 5 is made of a solid aluminum rod, a solid iron rod, or a solid stainless steel rod; a plastic head 3 is fixed to the bottom of the backrest vertical tube 2, that is: a rubber head socket is opened at the top of the plastic head 3, and the bottom of the backrest vertical tube 2 can be tightly inserted into the rubber head socket to form an integrated fixed connection with the plastic head 3, and the backrest vertical tube 2 and the plastic head 3 are also connected as a whole by a transverse screw to improve the firmness and stability of the connection. The plastic head 3 and the rear foot rod 1 can be connected in a press-contact manner, and the plastic head 3 and the rear foot rod 1 can be separated. In order to facilitate the folding and unfolding of the wheelchair, when the wheelchair is unfolded, the bottom surface of the plastic head 3 presses against the rear foot rod 1, supporting the backrest vertical tube 2 through the rear foot rod 1. When the wheelchair is folded, the backrest vertical tube 2 and the plastic head 3 are lifted and flipped backward, and the plastic head 3 is separated from the rear foot rod 1.

[0015] The main technical improvements of this product are:

[0016] The bottom of the inner side wall of the bottom section of the rear foot rod 1 is movably connected to the bottom of the lock hook plate 4. The movably connected lock hook plate 4 is to facilitate the flipping movement of the backrest vertical tube 2 during folding and unfolding, and also plays a role in connection stability and positioning; the lock hook plate 4 is arranged on the inner side so as not to protrude outward, reasonably utilize space, and not hinder the movement of the backrest vertical tube 2 and the plastic head 3, so as to avoid possible pinching of people.

[0017] The bottom inner wall of the backrest vertical tube 2 is movably connected to the lower part of the upper section of the locking hook plate 4. The movable locking hook plate 4 is used to facilitate the flipping and movement of the backrest vertical tube 2 during folding and unfolding, and also plays a role in connection stability and positioning. The backrest vertical tube 2 can be flipped and hinged relative to the rear foot rod 1 through the locking hook plate 4. After hinged folding, the backrest vertical tube 2 moves closer to the rear foot rod 1.

[0018] The bottom section of the backrest vertical tube 2 is movably connected with a transverse locking rod 5, which can move up and down. The elastic device 6 is fixedly connected to the inner tube cavity of the backrest vertical tube 2, which is just suitable. The elastic device 6 is pressed against the transverse locking rod 5. Since the transverse locking rod 5 can move up and down, the transverse locking rod 5 can form an upward and downward compression elastic movement. Under normal circumstances, the transverse locking rod 5 is lifted up by the elastic device 6 and is in a locked state. The specific structure of the elastic device 6 is not limited here, and it only needs to have an elastic reset function.

[0019] The top of the lock hook plate 4 is provided with a hook hole 41, the mouth of the hook hole 41 is downward, and the hook hole 41 is in an inverted U shape, so that the transverse locking rod 5 can easily fall into the hook hole 41; after the wheelchair is unfolded, when the plastic head 3 presses the rear foot rod 1, the transverse locking rod 5 can automatically fall into the hook hole 41 to hook and lock the rear foot rod 1 and the backrest vertical tube 2; because the transverse locking rod 5 is inserted into the hook hole 41 from bottom to top and is continuously pressed upward by the elastic device 6, the transverse locking rod 5 will not automatically fall, so the lock hook plate 4 is locked by The hooking mouth 41 can hook the horizontal locking rod 5 tightly without automatically being unhooked. The hooking is firm and stable, so that the plastic head 3 is clamped between the backrest vertical tube 2 and the rear foot rod 1. The purpose of providing the plastic head 3 is to increase the connection area with the rear foot rod 1. The bottom surface shape of the plastic head 3 is consistent with the shape of the contact point of the top of the rear foot rod 1, so that the contact connection support is more stable. In addition, when the plastic head 3 is in contact with the rear foot rod 1, there will be no hard collision, and the mechanical contact between the two will be reduced.

[0020] To hinge and fold the wheelchair, the user first presses the horizontal locking rod 5 with their hand or foot, which releases the locking rod 5 from the hook opening 41. This release unlocks the connection between the rear leg rod 1 and the backrest vertical tube 2. Once unlocked, the backrest vertical tube 2 can be tilted and folded relative to the rear leg rod 1, and the plastic head 3 moves synchronously with the backrest vertical tube 2. That is, once unlocked, when the backrest vertical tube 2 tilts relative to the rear leg rod 1, the plastic head 3 moves synchronously with the backrest vertical tube 2 away from the rear leg rod 1. This locking structure is easy to unlock, provides a secure and stable hook connection, and is safe to use.

[0021] Preferably: a vertical long hole 21 is provided in the bottom section of the vertical tube 2 of the backrest, and the height of the vertical long hole 21 is not less than 3 cm to 4 cm, and the width is 7 mm to 10 mm; the transverse locking rod 5 can just be connected to the vertical long hole 21 in a transverse manner, and the end of the transverse locking rod 5 is fixed with a limit pin to prevent it from falling off, the top of the elastic device 6 presses the transverse locking rod 5, and the bottom presses on the bottom wall of the tube, and the height of the elastic device 6 is 3 cm to 5 cm. The transverse locking rod 5 forms an upward and downward compression elastic activity through the elastic device 6. This is to further refine the specific structure between the vertical tube 2 of the backrest and the transverse locking rod 5. The transverse locking rod 5 is well positioned for upward and downward elastic activity, has a good elastic compression effect, is simple in structure, and is easy to assemble; when unlocking, the transverse locking rod 5 is pressed down by the hand or foot, and the elastic device 6 is compressed. After releasing the hand or foot, the elastic device 6 rebounds and lifts up the transverse locking rod 5, always keeping it locked or waiting to be locked, preventing forgetting to lock, and ensuring safety in use.

[0022] Preferably: the elastic device 6 is a pressure return spring 61, which is more universal, has good pressure rebound effect, low cost, and good elastic effect. The top of the pressure return spring 61 presses the horizontal locking rod 5, and the bottom presses the bottom wall of the tube as support.

[0023] Preferably, the top of the plastic head 3 is provided with a plastic head insertion hole, and the bottom of the backrest riser 2 is tightly inserted into the plastic head insertion hole to form an integral fixed connection with the plastic head 3, wrapping the bottom cross-section of the backrest riser 2. The backrest riser 2 and the plastic head 3 are integrally fixed by a transverse screw, so that glue will not come out, the connection structure is durable and firm.

[0024] Preferably, the bottom section of the rear foot rod 1 and the bottom of the locking hook plate 4 are connected as one body by a transverse screw, which is low in cost, easy to set up and easy to assemble.

[0025] The bottom of the backrest vertical tube 2 and the lower part of the upper section of the locking hook plate 4 are connected as a whole by transverse screws, which is low in cost and easy to set up and assemble.

[0026] Preferably, the rear leg rod 1 is tilted 40 to 50 degrees from the back to the front, preferably 45 degrees, which is relatively moderate.

[0027] Preferably, the rear leg rod 1 , the backrest vertical tube 2 , and the plastic head 3 correspond vertically to each other, and the rear leg rod 1 has better support stability for the backrest vertical tube 2 , and the supporting force is centered.

[0028] The specific structure of this product is as follows:

[0029] A locking and unlocking device for a rear foot rod 1 and a backrest vertical tube 2, belonging to a wheelchair component, comprises a rear foot rod 1 tilted from rear to front, a backrest vertical tube 2, a plastic head 3, a lock hook plate 4, a horizontal locking rod 5, and an elastic device 6; the rear foot rod 1 is tilted 45 degrees from rear to front; the rear foot rod 1, backrest vertical tube 2, and plastic head 3 correspond vertically;

[0030] A rubber head socket is provided on the top of the plastic head 3, and the bottom of the backrest vertical tube 2 is tightly inserted into the rubber head socket to form an integral fixed connection with the plastic head 3; the backrest vertical tube 2 and the plastic head 3 are connected and fixed as a whole by a transverse screw.

[0031] The bottom section of the rear foot rod 1 and the bottom of the lock hook plate 4 are connected as a whole by a transverse screw, so that the inner side wall of the bottom section of the rear foot rod 1 is movably connected to the bottom of the lock hook plate 4;

[0032] The bottom of the backrest vertical tube 2 is connected to the lower part of the upper section of the lock hook plate 4 by a transverse screw, so that the inner side wall of the bottom of the backrest vertical tube 2 is movably connected to the lower part of the upper section of the lock hook plate 4;

[0033] A vertical long hole 21 is opened transversely through the bottom section of the backrest vertical tube 2; the transverse locking rod 5 is connected to the vertical long hole 21 transversely, and the transverse locking rod 5 can move up and down. The elastic device 6 is connected to the inside of the backrest vertical tube 2, and the top of the elastic device 6 presses the transverse locking rod 5 and the bottom presses on the bottom wall inside the tube (that is, the elastic device 6 is a pressure return spring 61, and the top of the pressure return spring 61 presses the transverse locking rod 5 and the bottom presses on the bottom wall inside the tube). The transverse locking rod 5 forms an upward and downward compression elastic movement through the elastic device 6.

[0034] The upper top of the locking hook plate 4 is provided with a hook hole 41, and the mouth of the hook hole 41 faces downward; after the wheelchair is unfolded, when the plastic head 3 presses the rear foot rod 1, the transverse locking rod 5 can automatically fall into the hook hole 41 to hook and lock the rear foot rod 1 and the backrest vertical tube 2; when the wheelchair needs to be hinged and folded, first press the transverse locking rod 5 with your hand or foot, and the transverse locking rod 5 will come out of the hook hole 41. When the transverse locking rod 5 comes out of the hook hole 41, the rear foot rod 1 and the backrest vertical tube 2 are unlocked. After unlocking, the backrest vertical tube 2 can be flipped and folded relative to the rear foot rod 1, and the plastic head 3 moves synchronously with the backrest vertical tube 2.

Claims

1. A locking and unlocking device for a rear foot rod and a backrest vertical pipe, belonging to a wheelchair component, comprising a rear foot rod inclined from the back to the front, a backrest vertical pipe, a plastic head, a lock hook plate, a horizontal locking rod, and an elastic device. A plastic head is fixed to the bottom of the backrest vertical pipe, and the plastic head and the rear foot rod can be connected in a pressing contact manner, and the plastic head and the rear foot rod can be separated, characterized in that: The inner side wall of the bottom section of the rear foot rod is movably connected to the bottom of the lock hook plate; The bottom inner side wall of the backrest vertical tube is movably connected to the lower part of the upper section of the lock hook plate; The bottom section of the backrest vertical tube is movably connected with a transverse locking rod, which can move up and down. The elastic device is connected to the inside of the backrest vertical tube, and the elastic device is connected to the transverse locking rod by top pressure, so that the transverse locking rod forms an upward and downward compression elastic movement; The upper top of the lock hook plate is provided with a hook opening, and the hook opening faces downward; When the plastic head presses against the rear foot rod, the horizontal locking rod falls into the hook and buckle opening to hook and lock the rear foot rod and the backrest vertical pipe; The horizontal locking rod is disengaged from the hook and buckle mouth to unlock the rear foot rod and the backrest vertical tube. After unlocking, the backrest vertical tube can be flipped and folded relative to the rear foot rod, and the plastic head moves synchronously with the backrest vertical tube.

2. A locking and unlocking device for a rear foot rod and a backrest vertical tube according to claim 1, characterized in that: A vertical long hole is opened transversely through the bottom section of the backrest vertical tube; a transverse locking rod is transversely penetrated and connected to the vertical long hole, the top of the elastic device presses the transverse locking rod, and the bottom presses on the bottom wall of the tube, and the transverse locking rod forms an upward and downward compression elastic activity through the elastic device.

3. The locking and unlocking device for the rear foot rod and the backrest vertical tube according to claim 1, characterized in that: The elastic device is a pressure return spring, the top of which presses the transverse locking rod, and the bottom of which presses the bottom wall of the tube.

4. A locking and unlocking device for a rear foot rod and a backrest vertical pipe according to any one of claims 1 to 3, characterized in that: The top of the plastic head is provided with a rubber head insertion hole, and the bottom of the backrest vertical pipe is tightly inserted into the rubber head insertion hole to form an integral fixed connection with the plastic head.

5. The locking and unlocking device for the rear foot rod and the backrest vertical pipe according to claim 4, characterized in that: The backrest vertical pipe and the plastic head are connected and fixed as a whole through transverse screws.

6. A locking and unlocking device for a rear foot rod and a backrest vertical pipe according to any one of claims 1 to 3, characterized in that: The bottom section of the rear foot rod and the bottom of the lock hook plate are connected as a whole through a transverse screw.

7. A locking and unlocking device for a rear foot rod and a backrest vertical pipe according to any one of claims 1 to 3, characterized in that: The bottom of the backrest vertical pipe and the lower part of the upper section of the lock hook plate are connected as a whole through transverse screws.

8. A locking and unlocking device for a rear foot rod and a backrest vertical pipe according to any one of claims 1 to 3, characterized in that: The rear foot rod is made of aluminum tube or iron tube; the backrest vertical tube is made of aluminum tube or iron tube; the lock hook plate is made of aluminum, iron or stainless steel; the horizontal lock rod is made of solid aluminum rod, solid iron rod or solid stainless steel rod.

9. A locking and unlocking device for a rear foot rod and a backrest vertical pipe according to any one of claims 1 to 3, characterized in that: The rear foot rod is inclined 40 to 50 degrees from the back to the front.

10. A locking and unlocking device for a rear foot rod and a backrest vertical pipe according to any one of claims 1 to 3, characterized in that: The rear foot rod, the backrest vertical pipe and the plastic head correspond vertically.

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