Folding mechanism with lock for wheel type walking aid

Abstract

A folding mechanism with a lock for a wheel type walking aid comprises a front frame fixing structure, a rear frame fixing structure, a left joint folding connecting piece, a right joint folding connecting piece, a lower joint folding connecting piece, an automatic locking piece structure and a seat fixing plate, and a front opening is formed in the middle of the front frame fixing structure; a rear opening is formed in the middle of the rear frame fixing structure, a first shaft rod is arranged at the top of the front frame fixing structure in a penetrating mode, the automatic locking piece structure is located below the seat fixing plate and fixedly connected with the seat fixing plate, and the seat fixing plate is fixedly connected with the top face of the rear frame fixing structure. The automatic locking piece structure comprises an elastic spring bolt and an unlocking pull piece, the elastic spring bolt is locked with the first shaft rod when the front frame fixing structure and the rear frame fixing structure are unfolded, and the elastic spring bolt is separated from the first shaft rod when the unlocking pull piece is pulled. The front and back folding wheel type walking aid is applied to the front and back folding wheel type walking aid, and the front and back folding operation of the wheel type walking aid is simpler and more convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to walking auxiliary appliance field, specifically speaking is a kind of folding mechanism with lock for wheeled walking aid. BACKGROUND

[0002] Folding mechanism is a kind of common baby carriage, wheelchair, trailer, wheeled walking aid etc. Body mechanism, especially for portable furniture, tool, front and rear folding wheeled walking aid field, and widely applicable to the crowd.

[0003] The existing front and rear folding wheeled walking aid includes front support frame and rear support frame, and folding mechanism is usually arranged between the front support frame and the rear support frame, so as to realize the folding of the front support frame and the rear support frame, and the operating mechanism of the existing folding mechanism is set as buckle type, and manual pulling, prying, pressing and the like are needed to complete locking and unlocking, which is time-consuming and laborious, and there is a risk that the user is injured due to loss of balance after automatic unlocking to a certain extent, which is very inconvenient for the old people, disabled people or people with injured limbs who are highly dependent on the wheeled walking aid to use pulling, prying, pressing and the like, and automatic unlocking may have a very adverse effect on them, causing some injuries, so there is a certain safety hazard to a certain extent, which is not conducive to the safe and effective use of the user group. CONTENT OF THE UTILITY MODEL

[0004] The utility model provides a folding mechanism with lock for wheeled walking aid, and the main purpose is to overcome the problem that the folding mechanism of the existing front and rear folding wheeled walking aid is inconvenient to operate and time-consuming and laborious when folding.

[0005] In order to solve the above technical problems, the utility model adopts the following technical scheme:

[0006] A kind of belt lock folding mechanism for wheeled walker, including front frame fixed structure, rear frame fixed structure, left joint folding connecting piece, right joint folding connecting piece, lower joint folding connecting piece, automatic lock structure and seat fixed plate, the middle part of the front frame fixed structure is equipped with front opening, the middle part of the rear frame fixed structure is equipped with rear opening, the top of the front frame fixed structure is equipped with first shaft rod, the front and rear ends of the left joint folding connecting piece are respectively hinged with the left side upper portion of front frame fixed structure and the left side upper portion of rear frame fixed structure, the front and rear ends of the right joint folding connecting piece are respectively hinged with the right side upper portion of front frame fixed structure and the right side upper portion of rear frame fixed structure, the front end of the lower joint folding connecting piece is located at the bottom of front opening and is hinged with front frame fixed structure, the rear end of the lower joint folding connecting piece is located at the bottom of rear opening and is hinged with rear frame fixed structure, the automatic lock structure is located below seat fixed plate and is fixedly connected with seat fixed plate, the top surface of seat fixed plate is fixedly connected with rear frame fixed structure, the automatic lock structure includes elastic lock tongue and unlocking pull tab, when the front frame fixed structure and rear frame fixed structure are unfolded, elastic lock tongue is locked with first shaft rod, when unlocking pull tab is pulled, elastic lock tongue is separated from first shaft rod.

[0007] Further, the automatic lock structure further includes a housing, the elastic lock tongue is located in the housing, the front end of the elastic lock tongue extends out of the housing, the unlocking pull tab is connected to the rear end of the elastic lock tongue, the housing is provided with a spring and a spring sleeve rod, the bottom of the elastic lock tongue is provided with a receiving groove, the top of the elastic lock tongue is provided with a strip-shaped groove in communication with the receiving groove, the receiving groove is provided with a spring abutting portion, the spring is arranged between the spring sleeve rod and the spring abutting portion, the seat fixed plate is connected with the housing by a first bolt, the bottom of the first bolt is connected with a first nut in sequence through the strip-shaped groove, the receiving groove and the bottom surface of the housing.

[0008] Further, the front end surface of the elastic lock tongue is a circular arc surface inclined from front to back.

[0009] Further, the top surface of the housing is provided with a spacer sleeve, the housing is provided with a fixing sleeve, the fixing sleeve passes through the strip-shaped groove and the receiving groove, and the first bolt passes through the spacer sleeve and the fixing sleeve.

[0010] Further, the front frame fixed structure includes a left front fixed block and a right front fixed block, the left front fixed block and the right front fixed block form the front opening, the first shaft rod passes through the top of the left front fixed block and the top of the right front fixed block, the left part of the first shaft rod passes through the front end of the left joint folding connecting piece, the right part of the first shaft rod passes through the front end of the right joint folding connecting piece, a second shaft rod passes through the bottom of the left front fixed block and the bottom of the right front fixed block, and the second shaft rod passes through the front end of the lower joint folding connecting piece.

[0011] Further, the top of the left front fixed block and the top of the right front fixed block are provided with a first T-shaped plastic pipe sleeve, the front end of the left joint folding connecting piece and the front end of the right joint folding connecting piece are provided with a second T-shaped plastic pipe sleeve, the first shaft rod passes through the first T-shaped plastic pipe sleeve and the second T-shaped plastic pipe sleeve, the bottom of the left front fixed block and the bottom of the right front fixed block are provided with a third T-shaped plastic pipe sleeve, the front end of the lower joint folding connecting piece is provided with a fourth T-shaped plastic pipe sleeve, and the second shaft rod passes through the third T-shaped plastic pipe sleeve and the fourth T-shaped plastic pipe sleeve.

[0012] Further, the rear frame fixed structure comprises a left rear fixed block and a right rear fixed block, the left rear fixed block and the right rear fixed block form the rear opening, the top of the left rear fixed block and the top of the right rear fixed block are provided with a third shaft rod, the left part of the third shaft rod passes through the rear end of the left joint folding connecting piece, the right part of the third shaft rod passes through the rear end of the right joint folding connecting piece, the bottom of the left rear fixed block and the bottom of the right rear fixed block are provided with a fourth shaft rod, and the fourth shaft rod passes through the rear end of the lower joint folding connecting piece.

[0013] Further, the top of the left rear fixed block and the top of the right rear fixed block are provided with a fifth T-shaped plastic pipe sleeve for the third shaft rod to pass through, the rear end of the left joint folding connecting piece and the rear end of the right joint folding connecting piece are provided with a sixth T-shaped plastic pipe sleeve, the third shaft rod passes through the fifth T-shaped plastic pipe sleeve and the sixth T-shaped plastic pipe sleeve, the bottom of the left rear fixed block and the bottom of the right rear fixed block are provided with a seventh T-shaped plastic pipe sleeve, the rear end of the lower joint folding connecting piece is provided with an eighth T-shaped plastic pipe sleeve, and the fourth shaft rod passes through the seventh T-shaped plastic pipe sleeve and the eighth T-shaped plastic pipe sleeve.

[0014] Further, the seat fixed plate is connected with the rear frame fixed structure through a plurality of screws.

[0015] From the above description of the utility model, compared with the prior art, the utility model has the following advantages: the front frame fixing structure and the rear frame fixing structure are fixedly connected with the front support frame and the rear support frame of the front-rear folding wheeled walking aid respectively, the top surface of the seat fixing plate is connected with a seat, when the walking aid is unfolded for use, the elastic lock tongue is locked with the first shaft rod, at this time, the front frame fixing structure and the rear frame fixing structure cannot be folded; when the front-rear folding wheeled walking aid needs to be folded, the elastic lock tongue is separated from the first shaft rod by pulling the unlocking pull piece, and then the front end of the seat is lifted up, the rear frame fixing structure, the left joint folding connecting piece, the right joint folding connecting piece, the lower joint folding connecting piece, the automatic lock piece structure, the seat fixing plate and the seat are synchronously folded, so that the rear support frame of the front-rear folding wheeled walking aid is folded to the front support frame, thereby the folding of the walking aid is completed. When the wheeled walking aid is unfolded, the front support frame and the rear support frame of the front-rear folding wheeled walking aid are unfolded front and back, under the action of gravity, the rear frame fixing structure, the left joint folding connecting piece, the right joint folding connecting piece, the lower joint folding connecting piece, the automatic lock piece structure, the seat fixing plate and the seat are moved downwards, and the elastic lock tongue is locked with the first shaft rod. The utility model is applied to the front-rear folding wheeled walking aid, and is more convenient and labor-saving in folding the wheeled walking aid front and back, and only needs to pull the unlocking pull piece to be unlocked, and is automatically locked under the gravity of the rear frame fixing structure, the left joint folding connecting piece, the right joint folding connecting piece, the lower joint folding connecting piece, the automatic lock piece structure, the seat fixing plate and the seat, so that the safety hidden danger existing in operation of the user is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural diagram of the utility model.

[0017] Figure 2 It is a structural diagram of the utility model from another angle.

[0018] Figure 3 It is a structural exploded view of the utility model.

[0019] Figure 4 It is a further structural exploded view. Figure 3

[0020] Figure 5 It is a structural diagram of the automatic lock piece structure of the utility model.

[0021] Figure 6 It is a structural exploded view of the automatic lock piece structure of the utility model.

[0022] Figure 7 It is a structural exploded view of the automatic lock piece structure of the utility model from another angle.

[0023] ​Figure 8 is a sectional view of the present application.

[0024] Figure 9 is a structure view of the present application after folding.

[0025] Figure 10 is a structure view of the present application after folding from another angle.

[0026] Figure 11 is a use state view of the present application. DETAILED DESCRIPTION

[0027] In the description of the present application, it is understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0028] Reference Figures 1 to 3 , Figure 8A kind of belt lock folding mechanism for wheeled walker, including front frame fixed structure 1, rear frame fixed structure 2, left joint folding connecting piece 3, right joint folding connecting piece 4, lower joint folding connecting piece 5, automatic lock piece structure 6 and seat fixing plate 7.The middle part of the front frame fixed structure 1 is equipped with front opening 10, the middle part of the rear frame fixed structure 2 is equipped with rear opening 20, the top of the front frame fixed structure 1 is equipped with first shaft 8.The front and rear ends of the left joint folding connecting piece 3 are respectively hinged with the left side upper portion of the front frame fixed structure 1 and the left side upper portion of the rear frame fixed structure 2, the front and rear ends of the right joint folding connecting piece 4 are respectively hinged with the right side upper portion of the front frame fixed structure 1 and the right side upper portion of the rear frame fixed structure 2, the front end of the lower joint folding connecting piece 5 is located at the bottom of front opening 10 and is hinged with the front frame fixed structure 1, the rear end of the lower joint folding connecting piece 5 is located at the bottom of rear opening 20 and is hinged with the rear frame fixed structure 2.The automatic lock piece structure 6 is located below seat fixing plate 7 and is fixedly connected with seat fixing plate 7, and the seat fixing plate 7 is fixedly connected with the top surface of the rear frame fixed structure 2.The automatic lock piece structure 6 includes elastic lock tongue 61 and unlocking pull tab 62, when the front frame fixed structure 1 and the rear frame fixed structure 2 are unfolded, elastic lock tongue 61 is locked with first shaft 8, while the front end bottom surface of seat fixing plate 7 is in contact with the top surface of front frame fixed structure 1, when unlocking pull tab 62 is pulled, elastic lock tongue 61 is separated from first shaft 8, and the front end surface of elastic lock tongue 61 is a circular arc surface 611 inclined from front to back.

[0029] Referring to Figure 1 , the front frame fixed structure 1, the rear frame fixed structure 2, the left joint folding connecting piece 3, the right joint folding connecting piece 4, the lower joint folding connecting piece 5, the automatic lock piece structure 6 and the seat fixing plate 7 are all made of metal material.

[0030] Referring to Figure 1 , Figures 3 to 8The automatic lock structure 6 further comprises a housing 63 connected by an upper housing and a lower housing, the elastic lock tongue 61 is located in the housing 63, the front end of the elastic lock tongue 61 extends out of the housing 63, and the unlocking pull tab 62 is connected to the rear end of the elastic lock tongue 61. The housing 63 is provided with a spring 64 and a spring sleeve rod 65, the bottom of the elastic lock tongue 61 is provided with a containing groove 66, the top of the elastic lock tongue 61 is provided with a strip-shaped groove 67 in communication with the containing groove 66, the containing groove 66 is provided with a spring abutting portion 68, and the spring 64 is arranged between the spring sleeve rod 65 and the spring abutting portion 68. The seat fixing plate 4 is connected with the housing 63 through a first bolt 69, the bottom of the first bolt 69 is connected with a first nut 60 in sequence by penetrating through the strip-shaped groove 67, the containing groove 66 and the bottom surface of the housing 63, and the first bolt 69 is a internal hexagonal bolt. The top surface of the housing 63 is provided with a spacer sleeve 631, the housing 63 is provided with a fixing sleeve 632, the fixing sleeve 632 penetrates through the strip-shaped groove 67 and the containing groove 66, the first bolt 69 penetrates through the spacer sleeve 631 and the fixing sleeve 632, and in the embodiment, the first bolt 69, the first nut 60, the spacer sleeve 631 and the fixing sleeve 632 are each provided with two.

[0031] With reference to Figures 1 to 4 The front frame fixing structure 1 comprises a left front fixed block 11 and a right front fixed block 12, the left front fixed block 11 and the right front fixed block 12 form the front opening 10, the first shaft rod 8 penetrates through the top of the left front fixed block 11 and the top of the right front fixed block 12, the left part of the first shaft rod 8 penetrates through the front end of the left joint folding connecting piece 3, and the right part of the first shaft rod 8 penetrates through the front end of the right joint folding connecting piece 4. A second shaft rod 13 penetrates through the bottom of the left front fixed block 11 and the bottom of the right front fixed block 12, and the second shaft rod 13 penetrates through the front end of the lower joint folding connecting piece 5. The top of the left front fixed block 11 and the top of the right front fixed block 12 are each provided with a first T-shaped plastic pipe sleeve 14, the front end of the left joint folding connecting piece 3 and the front end of the right joint folding connecting piece 4 are each provided with a second T-shaped plastic pipe sleeve 15, and the first shaft rod 8 penetrates through the first T-shaped plastic pipe sleeve 14 and the second T-shaped plastic pipe sleeve 15. The bottom of the left front fixed block 11 and the bottom of the right front fixed block 12 are each provided with a third T-shaped plastic pipe sleeve 16, the front end of the lower joint folding connecting piece 5 is provided with a fourth T-shaped plastic pipe sleeve 17, and the second shaft rod 13 penetrates through the third T-shaped plastic pipe sleeve 16 and the fourth T-shaped plastic pipe sleeve 17.

[0032] With reference to Figures 1 to 4The first T-shaped plastic pipe sleeve 14 can avoid abrasion between the left front fixed block 11 and the right front fixed block 12 and the first shaft 8 during folding or unfolding, and can reduce the gap between the left front fixed block 11 and the right front fixed block 12 and the first shaft 8. The second T-shaped plastic pipe sleeve 15 can avoid abrasion between the front end of the left joint folding connecting piece 3 and the right joint folding connecting piece 4 and the first shaft 8 during folding or unfolding, and can reduce the gap between the left joint folding connecting piece 3 and the right joint folding connecting piece 4 and the first shaft 8. The third T-shaped plastic pipe sleeve 16 can avoid abrasion between the left front fixed block 11 and the right front fixed block 12 and the second shaft 13 during folding or unfolding, and can reduce the gap between the left front fixed block 11 and the right front fixed block 12 and the second shaft 13. The fourth T-shaped plastic pipe sleeve 17 can avoid abrasion between the lower joint folding connecting piece 5 and the second shaft 13 during folding or unfolding, and can reduce the gap between the lower joint folding connecting piece 5 and the second shaft 13.

[0033] Referring to Figures 1 to 4 The rear frame fixing structure 2 includes a left rear fixed block 21 and a right rear fixed block 22, both of which are triangular, and the left rear fixed block 21 and the right rear fixed block 22 form the rear opening 20 therebetween. A third shaft 23 is provided through the top of the left rear fixed block 21 and the top of the right rear fixed block 22, the left part of the third shaft 23 passes through the rear end of the left joint folding connecting piece 3, and the right part of the third shaft 23 passes through the rear end of the right joint folding connecting piece 4. A fourth shaft 24 is provided through the bottom of the left rear fixed block 21 and the bottom of the right rear fixed block 22, and the fourth shaft 24 passes through the rear end of the lower joint folding connecting piece 5. The top of the left rear fixed block 21 and the top of the right rear fixed block 22 are provided with a fifth T-shaped plastic pipe sleeve 25 for the third shaft 23 to pass through, the rear end of the left joint folding connecting piece 3 and the rear end of the right joint folding connecting piece 4 are provided with a sixth T-shaped plastic pipe sleeve 26, and the third shaft 23 passes through the fifth T-shaped plastic pipe sleeve 25 and the sixth T-shaped plastic pipe sleeve 26. The bottom of the left rear fixed block 21 and the bottom of the right rear fixed block 22 are provided with a seventh T-shaped plastic pipe sleeve 27, and the rear end of the lower joint folding connecting piece 5 is provided with an eighth T-shaped plastic pipe sleeve 28, and the fourth shaft 24 passes through the seventh T-shaped plastic pipe sleeve 27 and the eighth T-shaped plastic pipe sleeve 28.

[0034] Referring to Figures 1 to 4The fifth T-shaped plastic pipe sleeve 25 can avoid abrasion between the third shaft rod 23 and the left rear fixed block 21 and the right rear fixed block 22 during folding or unfolding, and can reduce the gap between the third shaft rod 23 and the left rear fixed block 21 and the right rear fixed block 22. The sixth T-shaped plastic pipe sleeve 26 can avoid abrasion between the third shaft rod 23 and the left joint folding connector 3 and the right joint folding connector 4 during folding or unfolding, and can reduce the gap between the third shaft rod 23 and the left joint folding connector 3 and the right joint folding connector 4. The seventh T-shaped plastic pipe sleeve 27 can avoid abrasion between the fourth shaft rod 24 and the left rear fixed block 21 and the right rear fixed block 22 during folding or unfolding, and can reduce the gap between the fourth shaft rod 24 and the left rear fixed block 21 and the right rear fixed block 22. The eighth T-shaped plastic pipe sleeve 28 can avoid abrasion between the fourth shaft rod 24 and the lower joint folding connector 5 during folding or unfolding, and can reduce the gap between the fourth shaft rod 24 and the lower joint folding connector 5.

[0035] With reference to Figure 1 , Figure 3 and Figure 11 In the embodiment, the front end of the left front fixed block 11 and the front end of the right front fixed block 12 are both provided with a front mounting port 18, and a front support frame 30 of the front-rear folding wheeled walker is welded in the front mounting port 18; the rear end of the left rear fixed block 21 and the right rear fixed block 22 are both provided with a rear mounting port 29, and a rear support frame 31 of the front-rear folding wheeled walker is locked in the rear mounting port 29. The first shaft rod 8, the second shaft rod 13, the third shaft rod 23 and the fourth shaft rod 24 are all internal hexagonal bolts, one end of which is provided with a threaded section, and the threaded section is connected with a second nut 19.

[0036] With reference to Figure 2 , Figure 3 and Figure 11 The seat fixing plate 7 is connected with the rear frame fixing structure 2 through a plurality of screws 71, specifically, the seat fixing plate 7 is fixedly connected with the left rear fixed block 21 and the right rear fixed block 22 through the screws 71, and the top surface of the seat fixing plate 7 is connected with a seat 32.

[0037] With reference to Figures 1 to 11The utility model discloses a front frame fixed structure 1's left front fixed block 11 and right front fixed block 12 are welded with the front support frame 30 of front -back folding wheel type walking aid, the left rear fixed block 21 and right rear fixed block 22 of rear frame fixed structure 2 are fixedly connected with the rear support frame 31 of front -back folding wheel type walking aid, the top of seat fixed plate 7 is connected with seat 32. When front -back folding wheel type walking aid is unfolded and is used, the top of elastic lock tongue 61 is in contact with the bottom of first axle rod 8 and is locked, and at this time, front frame fixed structure 1 and rear frame fixed structure 2 structure can not be folded. When front -back folding wheel type walking aid needs folding, unblock pull -tab 62 and drive elastic lock tongue 61 to move back to make elastic lock tongue 61 and first axle rod 8 separate, and then the front end of seat 32 is lifted, and rear frame fixed structure 2, left joint folding connecting piece 3, right joint folding connecting piece 4, lower joint folding connecting piece 5, automatic lock piece structure 6, seat fixed plate 7 and seat are folded synchronously, so that the rear support frame 31 of front -back folding wheel type walking aid is folded to the front support frame 30, thereby the folding of walking aid is completed. When opening wheel type walking aid, the front support frame 30 and rear support frame 31 of front -back folding wheel type walking aid are opened forward and backward, under the action of gravity, rear frame fixed structure 2, left joint folding connecting piece 3, right joint folding connecting piece 4, lower joint folding connecting piece 5, automatic lock piece structure 6, seat fixed plate 7 and seat move downward, when the front end of elastic lock tongue 61 arc surface 611 is in contact with first axle rod 8, because arc surface 611 is inclined from front to back, with the descending of elastic lock tongue 61, elastic lock tongue 61 is automatically moved back, until arc surface 61 and first axle rod 8 have no contact, and elastic lock tongue 61 is automatically reset, and the top of elastic lock tongue 61 is in contact with the bottom of first axle rod 8 and is locked.

[0038] The above is merely a specific implementation manner of the utility model, but the design concept of the utility model is not limited to this, and any non-essential change of the utility model by using the concept should belong to the act of infringing the protection scope of the utility model.

Claims

1. A strap locking folding mechanism for a wheeled rollator, characterized by: The application relates to a seat folding structure, which comprises a front frame fixing structure, a rear frame fixing structure, a left joint folding connecting piece, a right joint folding connecting piece, a lower joint folding connecting piece, an automatic locking structure and a seat fixing plate, a front opening is formed in the middle of the front frame fixing structure, a rear opening is formed in the middle of the rear frame fixing structure, a first shaft rod is arranged on the top of the front frame fixing structure, the front and rear ends of the left joint folding connecting piece are hingedly connected to the upper left side of the front frame fixing structure and the upper left side of the rear frame fixing structure respectively, the front and rear ends of the right joint folding connecting piece are hingedly connected to the upper right side of the front frame fixing structure and the upper right side of the rear frame fixing structure respectively, the front end of the lower joint folding connecting piece is located at the bottom of the front opening and is hingedly connected to the front frame fixing structure, the rear end of the lower joint folding connecting piece is located at the bottom of the rear opening and is hingedly connected to the rear frame fixing structure, the automatic locking structure is arranged below the seat fixing plate and is fixedly connected to the seat fixing plate, the seat fixing plate is fixedly connected to the top surface of the rear frame fixing structure, the automatic locking structure comprises an elastic lock tongue and an unlocking pull piece, the elastic lock tongue is locked with the first shaft rod when the front frame fixing structure and the rear frame fixing structure are unfolded, and the elastic lock tongue is separated from the first shaft rod when the unlocking pull piece is pulled.

2. A folding mechanism with lock for a wheeled walking aid according to claim 1, characterized in that: The automatic locking structure further comprises a shell, the elastic lock tongue is arranged in the shell, the front end of the elastic lock tongue extends out of the shell, the unlocking pull piece is connected to the rear end of the elastic lock tongue, a spring and a spring sleeve rod are arranged in the shell, a containing groove is arranged at the bottom of the elastic lock tongue, a strip-shaped groove is arranged at the top of the elastic lock tongue and communicates with the containing groove, a spring abutting portion is arranged in the containing groove, the spring is arranged between the spring sleeve rod and the spring abutting portion, the seat fixing plate is connected to the shell through a first bolt, and the bottom of the first bolt is connected to a first nut through the strip-shaped groove, the containing groove and the bottom surface of the shell in sequence.

3. A folding mechanism with lock for a wheeled walking aid according to claim 1, characterized in that: The front end surface of the elastic lock tongue is a circular arc surface which is inclined from front to back.

4. A folding mechanism with lock for a wheeled walking aid according to claim 2, characterized in that: A spacer sleeve is arranged on the top surface of the shell, a fixing sleeve is arranged in the shell, the fixing sleeve passes through the strip-shaped groove and the containing groove, and the first bolt passes through the spacer sleeve and the fixing sleeve.

5. A folding mechanism for a wheeled walking aid according to claim 1, wherein: The front frame fixing structure comprises a left front fixing block and a right front fixing block, the left front fixing block and the right front fixing block form the front opening, the first shaft rod passes through the top of the left front fixing block and the top of the right front fixing block, the left part of the first shaft rod passes through the front end of the left joint folding connecting piece, the right part of the first shaft rod passes through the front end of the right joint folding connecting piece, a second shaft rod is arranged in the bottom of the left front fixing block and the bottom of the right front fixing block, and the second shaft rod passes through the front end of the lower joint folding connecting piece.

6. A folding mechanism with lock for a wheeled walking aid according to claim 5, characterized in that: The top of the left front fixed block and the top of the right front fixed block are provided with first T-shaped plastic pipe sleeves, the front end of the left joint folding connecting piece and the front end of the right joint folding connecting piece are provided with second T-shaped plastic pipe sleeves, the first shaft rod passes through the first T-shaped plastic pipe sleeves and the second T-shaped plastic pipe sleeves, the bottom of the left front fixed block and the bottom of the right front fixed block are provided with third T-shaped plastic pipe sleeves, the front end of the lower joint folding connecting piece is provided with a fourth T-shaped plastic pipe sleeve, and the second shaft rod passes through the third T-shaped plastic pipe sleeves and the fourth T-shaped plastic pipe sleeve.

7. A folding mechanism for a wheeled walking aid according to claim 1, wherein: The rear frame fixing structure comprises a left rear fixed block and a right rear fixed block, the left rear fixed block and the right rear fixed block form the rear opening, the top of the left rear fixed block and the top of the right rear fixed block are provided with a third shaft rod, the left part of the third shaft rod passes through the rear end of the left joint folding connecting piece, the right part of the third shaft rod passes through the rear end of the right joint folding connecting piece, the bottom of the left rear fixed block and the bottom of the right rear fixed block are provided with a fourth shaft rod, and the fourth shaft rod passes through the rear end of the lower joint folding connecting piece.

8. A folding mechanism with lock for a wheeled walking aid according to claim 7, characterized in that: The top of the left rear fixed block and the top of the right rear fixed block are provided with fifth T-shaped plastic pipe sleeves for the third shaft rod to pass through, the rear end of the left joint folding connecting piece and the rear end of the right joint folding connecting piece are provided with sixth T-shaped plastic pipe sleeves, the third shaft rod passes through the fifth T-shaped plastic pipe sleeves and the sixth T-shaped plastic pipe sleeves, the bottom of the left rear fixed block and the bottom of the right rear fixed block are provided with seventh T-shaped plastic pipe sleeves, the rear end of the lower joint folding connecting piece is provided with an eighth T-shaped plastic pipe sleeve, and the fourth shaft rod passes through the seventh T-shaped plastic pipe sleeves and the eighth T-shaped plastic pipe sleeve.

9. A folding mechanism for a wheeled walking aid according to claim 1, wherein: The seat fixing plate is connected with the rear frame fixing structure through a plurality of screws.

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