Lock catch structure of folding wheelchair

Abstract

The utility model relates to the field of wheelchairs, in particular to a lock catch structure of a folding wheelchair, which comprises an upper folding seat, a lower folding seat, a buckling piece and a buckling piece, the rear ends of the upper folding seat and the lower folding seat are mutually hinged, and the buckling piece and the buckling piece are respectively arranged at the front ends of the upper folding seat and the lower folding seat and vertically correspond to each other. The buckling piece is hinged to the upper folding base or the lower folding base in a resettable mode through a torsion spring, an upper outer connecting part is arranged at the top of the rear side of the upper folding base, a lower outer connecting part is arranged at the bottom of the lower folding base, and a guiding buckling piece used for guiding the buckling end of the buckling piece to the buckling piece is further arranged on the lower folding base. The upper folding seat is provided with a limiting piece used for limiting the maximum rotation amplitude of inward rotation of the buckling piece under the action of the torsional spring. The wheelchair can be quickly, efficiently and automatically locked, locking is convenient, and the wheelchair is light and convenient to fold.

Description

TECHNICAL FIELD

[0001] The utility model relates to a wheelchair field especially relates to a folding wheelchair's lock catch structure. BACKGROUND

[0002] The existing foldable wheelchair needs to be locked through some lock catch structures to be able to normally use after being folded to open use state, the existing lock catch structure is generally side lock catch and rear lock catch, the side lock catch generally needs manual to turn over lock catch piece to buckle firmly, and the rear lock catch needs the operator to turn to the rear of the wheelchair to unlock the wheelchair lock catch and then fold. Such as the application number " CN202321971349.0 " disclosed portable folding wheelchair, including backrest frame, cushion frame, armrest frame assembly and foot support assembly, the backrest frame middle part is folded with the rear end of cushion frame through armrest frame assembly, the lower end of backrest frame is folded with the rear end of foot support assembly, the front end of cushion frame is folded with the front end of foot support assembly, the front and rear ends of foot support assembly are respectively equipped with universal caster and rear caster, the pull rod assembly is connected on the foot support assembly, the pull rod assembly is arranged on the center position or close to the center position in the folding circle of wheelchair. The wheelchair is side lock catch structure, and manual rotation lock catch is needed to unlock, and it is more troublesome to operate. SUMMARY

[0003] The utility model discloses a folding wheelchair's lock catch structure can be unlocked and locked automatically, and the operation is convenient.

[0004] The utility model discloses a folding wheelchair's lock catch structure can be unlocked and locked automatically, and the operation is convenient.

[0005] A folding wheelchair's lock catch structure, including upper folding seat, lower folding seat, buckling piece and counter buckling piece, the rear end of upper folding seat and lower folding seat is hinged to each other, and the front end of upper folding seat and lower folding seat is respectively equipped with buckling piece and counter buckling piece and corresponds to each other, the buckling piece is resettablely hinged on upper folding seat or lower folding seat through torsional spring, the top of rear side of upper folding seat is equipped with upper outer connecting part, the bottom of lower folding seat is equipped with lower outer connecting part, the lower folding seat is still equipped with guide buckling piece for guiding the buckling end of buckling piece to counter buckling piece, and the upper folding seat is equipped with limiting piece for limiting the maximum turning amplitude of buckling piece under the action of torsional spring.

[0006] As preferred, the buckling piece includes the hook part at the lower part and the brake part at the upper part or the lower end of the hook part.

[0007] As preferred, when the brake part is at the upper part, the brake part is the tongue-shaped structure that is rear to front and upward, and when the brake part is at the lower end of the hook part, the hook part extends downward and forward from the lower end of the brake part.

[0008] As preferred, the pair of fasteners at least have front side and top with arc-shaped guide surface, the hook part can be abutted on the arc-shaped guide surface and can slide along the arc-shaped guide surface until the hook part is locked with the bottom of the guide fastener.

[0009] As preferred, the guide fastener is a guide tongue plate arranged from back to front and downward and extending to the upper surface of the pair of fasteners.

[0010] As preferred, the pair of fasteners is a round stick, the upper surface of the guide fastener extends to the top surface of the pair of fasteners, and the front end of the upper surface of the guide fastener is tangent to the stick surface of the pair of fasteners and the guide fastener.

[0011] As preferred, the upper folding seat includes upper seat plates on both sides and upper connecting plates connected between the upper seat plates, the lower folding seat includes lower seat plates on both sides and lower connecting plates connected between the lower seat plates, the limiting part is arranged at the symmetric center of the front end of the upper connecting plates, the guide fastener is arranged at the symmetric center of the front end of the lower connecting plates, the width of the limiting part is smaller than the width of the upper connecting plates, the width of the guide fastener is smaller than the width of the lower connecting plates, the upper seat plates and the lower seat plates are hinged through a hinge shaft, and the fastening part is hinged to the front end of the upper seat plates.

[0012] As preferred, the upper seat plates and the upper connecting plates are integrally formed by sheet metal material, and the lower seat plates and the lower connecting plates are integrally formed by sheet metal material.

[0013] Beneficial effects:

[0014] The upper and lower folding seats of the application are hinged, so that the seat frame of the wheelchair connected to the upper folding seat and the bottom frame of the wheelchair connected to the lower folding seat are hingedly associated and can rotate. When the wheelchair is unfolded, the fastening part on the upper folding seat at the bottom of the seat frame can automatically rotate and fasten to the pair of fasteners under the action of the gravity of the seat frame itself and the inertial force of the unfolding wheelchair. Moreover, the setting of the guide fastener can make the lower end of the fastening part abut on the guide fastener and then push the fastening part forward to rotate under the guidance of the surface of the guide fastener, so as to guide the fastening part to the pair of fasteners for fastening, thereby avoiding the situation that the fastening part cannot rotate under the action of the instantaneous fastening pressure and abuts on the lower folding seat. The setting of the limiting part can prevent the fastening part from excessively turning towards the rear of the wheelchair under the action of the torsional spring, which can cause the fastening part to be unable to be sequentially fastened or damaged due to the reverse force. The cooperation of the limiting part and the guide fastener can make the fastening part automatically lock quickly and efficiently, so as to conveniently lock the wheelchair. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0016] Figure 1 is a structure schematic diagram of the present application in use state;

[0017] Figure 2 is a structure schematic diagram of the present application in use state;

[0018] Figure 3 is a structure schematic diagram of the present application in use state;

[0019] Figure 4 is a structure schematic diagram of the present application in use state; DETAILED DESCRIPTION

[0020] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0021] The present application will be further described below in conjunction with the drawings:

[0022] Embodiment one:

[0023] The locking structure of the folding wheelchair comprises an upper folding seat 1, a lower folding seat 2, a clasp 3 and a counter-clasp 4. The rear ends of the upper folding seat and the lower folding seat are hinged to each other. The clasp and the counter-clasp are respectively arranged at the front ends of the upper folding seat and the lower folding seat and correspond to each other. The clasp is hingedly connected to the upper folding seat or the lower folding seat by a torsion spring. The top of the rear side of the upper folding seat is provided with an upper outer connecting part 11. The bottom of the lower folding seat is provided with a lower outer connecting part 12. The lower folding seat is further provided with a clasp guide 21 for guiding the clasp end of the clasp to the counter-clasp. The upper folding seat is provided with a limiting part 15 for limiting the maximum turning range of the clasp under the action of the torsion spring. The clasp comprises a clasp hook part 31 at the lower part and a brake part 32 at the upper part or at the lower end of the clasp hook part. When the locking of the wheelchair needs to be opened, the brake part can be manually pressed to drive the clasp to rotate and separate from the counter-clasp, thereby realizing quick unlocking. The brake part can be above the clasp. In order to prevent the brake part from being too close to the bottom of the seat of the wheelchair and causing inconvenience in upward pressing or difficulty in grasping, the brake part can be arranged at the bottom of the clasp hook part and extended forward of the seat, so that a gap is left between the brake part and the seat for the palm of the operator to exert force.

[0024] The hinged upper folding seat and lower folding seat of the application enable the seat frame of the wheelchair connected to the upper folding seat to be rotatably connected to the bottom frame of the wheelchair connected to the lower folding seat. When the wheelchair is opened, the clasp on the upper folding seat at the bottom of the seat frame can automatically rotate and be buckled to the counter-clasp under the action of the gravity of the seat frame itself and the inertial force of the unfolding of the wheelchair. Moreover, the arrangement of the clasp guide enables the lower end of the clasp to abut against the clasp guide when the wheelchair is unfolded, and then the clasp guide pushes the clasp to rotate forward under the guidance of the surface of the clasp guide, thereby guiding the clasp to the counter-clasp for buckling, so that the situation that the clasp cannot rotate under the action of the instantaneous buckling force and abuts against the lower folding seat can be avoided. The arrangement of the limiting part can prevent the clasp from excessively turning towards the rear of the wheelchair under the action of the torsion spring, thereby preventing the clasp from being buckled in disorder or being damaged due to the reverse force. The cooperation of the limiting part and the clasp guide enables the clasp to be automatically buckled quickly and efficiently when the locking is performed, thereby realizing convenient locking and facilitating the folding of the wheelchair.

[0025] Embodiment two:

[0026] The difference between the above embodiment and the present embodiment is that when the brake part is arranged at the upper part, the brake part is in the form of a plate tongue structure which is upwardly extended from rear to front. When the brake part is arranged at the lower end of the clasp hook part, the clasp hook part is downwardly and forwardly extended from the lower end of the brake part. When the upper folding seat is close to the bottom of the seat of the wheelchair, the brake part can be arranged outside the lower end of the clasp hook part. When there is enough space between the upper folding seat and the bottom of the seat of the wheelchair, the brake part in the form of a plate tongue structure can be arranged at the upper part of the clasp hook part.

[0027] Embodiment three:

[0028] The difference between the above embodiment is that the pair of buckles has an arc-shaped guide surface extending from the front side and the top, and the hook portion can be abutted against and slid along the arc-shaped guide surface until the hook portion is locked with the bottom of the guide buckle. The pair of buckles only needs to have an arc-shaped guide surface for guiding the hook portion.

[0029] Embodiment Four:

[0030] The difference between the above embodiment is that the guide buckle is a guide tongue plate extending from back to front and downward to the upper surface of the pair of buckles. The pair of buckles is a round rod, the upper surface of the guide buckle extends to the top surface of the pair of buckles, and the front end of the upper surface of the guide buckle is tangent to the rod surface of the pair of buckles and the guide buckle. The arc-shaped guide tongue plate extending from the guide buckle is tangent to the pair of buckles, so that the pair of buckles can be smoothly and conveniently guided to be locked, and the bottom of the hook portion is also provided with an arc-shaped surface, which can also ensure that the locking is not stuck and can be quickly and smoothly automatically locked. The pair of buckles can also not be a round rod, as long as the pair of buckles has an arc-shaped guide surface extending correspondingly to the upper surface of the guide buckle. Even the pair of buckles and the guide buckle can be integrally connected, or have a small gap, or be in contact or be fixed later.

[0031] Embodiment Four:

[0032] The difference between the above embodiment is that the upper folding seat includes upper seat plates 13 on both sides and upper connecting plates 14 connected between the upper seat plates, the lower folding seat includes lower seat plates 23 on both sides and lower connecting plates 22 connected between the lower seat plates, the limiting member is arranged at the center of symmetry of the front end of the upper connecting plate, the guide buckle is arranged at the center of symmetry of the front end of the lower connecting plate, the width of the limiting member is smaller than the width of the upper connecting plate, the width of the guide buckle is smaller than the width of the lower connecting plate, the upper seat plate and the lower seat plate are hinged through a hinge shaft, and the locking member is hinged to the front end of the upper seat plate. The upper seat plate 13 and the upper connecting plate 14 are integrally formed by a sheet-shaped metal material, and the lower seat plate 22 and the lower connecting plate 23 are integrally formed by a sheet-shaped metal material.

[0033] Through the above structure, the whole structure is simple, convenient to process, and low in cost. The guide buckle and the limiting member do not need to be too wide, as long as they can guide the pair of buckles smoothly.

[0034] The application has simple structure, low cost, and only needs to be fixed with the upper outer connecting part and the seat frame bottom of the wheelchair, and fixed with the lower outer connecting part and the front side frame tube of the bottom frame of the wheelchair during installation.

[0035] The basic principle, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application.

Claims

1. A locking structure for a folding wheelchair, characterized in that: The device comprises an upper closing seat (1), a lower closing seat (2), a buckling member (3) and a counter buckling member (4). The upper and lower closing seats are hingedly connected at their rear ends. The buckling member and the counter buckling member are arranged at the front ends of the upper and lower closing seats respectively and correspond to each other. The buckling member is hingedly connected to the upper or lower closing seat by a torsion spring. The upper closing seat is provided with an upper outer connecting part (11) at its top rear side. The lower closing seat is provided with a lower outer connecting part (12) at its bottom. The lower closing seat is further provided with a buckling guide (21) for guiding the buckling end of the buckling member to the counter buckling member. The upper closing seat is provided with a limiting member (15) for limiting the maximum turning range of the buckling member under the action of the torsion spring.

2. The folding wheelchair lock catch structure according to claim 1, wherein: The buckling member comprises a hook part (31) at its lower part and a brake part (32) at its upper part or at the lower end of the hook part.

3. The folding wheelchair lock catch structure according to claim 2, wherein: When the brake part is at the upper part, the brake part is in the form of a plate tongue structure which is raised upward from back to front. When the brake part is at the lower end of the hook part, the hook part extends downward and forward from the lower end of the brake part.

4. The folding wheelchair lock catch structure according to claim 2, wherein: The counter buckling member has an arc-shaped guide surface on at least its front side and top. The hook part can abut against the arc-shaped guide surface and slide along the arc-shaped guide surface until the hook part is buckled and locked with the bottom of the buckling guide.

5. The folding wheelchair locking structure according to any one of claims 2-4, wherein: The buckling guide is in the form of a guide tongue plate which extends from back to front and downward and to the upper surface of the counter buckling member.

6. The folding wheelchair lock catch structure according to claim 5, wherein: The counter buckling member is in the form of a round stick. The upper surface of the buckling guide extends to the top surface of the counter buckling member. The front end of the upper surface of the buckling guide is tangent to the stick surface of the counter buckling member and the buckling guide.

7. The folding wheelchair lock catch structure according to claim 5, wherein: The upper closing seat comprises upper seat plates (13) at its two sides and an upper connecting plate (14) connected between the upper seat plates. The lower closing seat comprises lower seat plates (23) at its two sides and a lower connecting plate (22) connected between the lower seat plates. The limiting member is arranged at the symmetric center of the front end of the upper connecting plate. The buckling guide is arranged at the symmetric center of the front end of the lower connecting plate. The width of the limiting member is smaller than the width of the upper connecting plate. The width of the buckling guide is smaller than the width of the lower connecting plate. The upper seat plates and the lower seat plates are hingedly connected by a hinge shaft. The buckling member is hingedly connected to the front end of the upper seat plate.

8. The folding wheelchair lock catch structure according to claim 7, wherein: The upper seat plates (13) and the upper connecting plate (14) are integrally formed by sheet metal material. The lower seat plates (23) and the lower connecting plate (22) are integrally formed by sheet metal material.

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