TWM524185U - Folding mechanism of wheel chair - Google Patents

Description

Wheelchair folding mechanism

This creation relates to mobile aids, and in particular to a wheelchair that can be folded.

U.S. Patent No. 3,758,150 discloses a folding wheelchair having upper and lower two toggle members, the upper toggle member being pivotally connected to the two side frames adjacent to the seat back, and the lower toggle member being pivotally connected between the bottom portions of the two side frames. . In addition, a fabric seat covers the top of the two side frames and is located above the lower toggle member. Below the fabric seat is a link set pivotally connected between the two side frames.

Although the upper and lower toggle members and the link set are unfolded, the fabric seat can be stretched to facilitate a user to move to the desired position by wheelchair. When the connecting rod set is folded, the upper and lower two elbow joints are folded in half, and the fabric seat is maintained in a folded state to reduce the volume of the wheelchair, which is advantageous for collecting and avoiding occupying excess space.

However, the upper and lower two toggle members of the wheelchair disclosed in the Patent No. 3,758,150 are separately folded, which is not only troublesome to operate, but also has many components and complicated structures, which causes troubles in assembly and relatively increases the manufacturing cost.

Therefore, how to simplify the folding mechanism of the wheelchair has become an urgent problem to be solved in this creation.

In view of this, the present invention provides a new type of wheelchair, the main purpose of which is to use a simplified folding mechanism to reduce unnecessary components with a reasonable structure, which is not only easy to assemble, but also simple in operation, relatively reducing production cost, and increasing market. Competitiveness.

Due to the above objectives, the folding mechanism of the present invention comprises: two side frames; a grip having an active space and a plurality of guiding holes respectively communicating with the movable space; a switch having two pins, when the switch is set Into the gripping space, the pins are respectively inserted into the corresponding guiding holes, through the grip and connected to the two ends of the switch; a main connecting seat, which is connected to the grip and can be synchronized, the two maintain a certain distance; the two main arms, these The main arm is connected to both sides of the main coupling seat and can reciprocate in the unfolding and folding positions. Each main arm includes a receiving slot and a connecting end. The receiving slot and the connecting end are at different ends of the main arm, and the connecting end is coupled with the corresponding end. The side frame can be rotated.

In the unfolded position, the two main arms push the two side frames apart by a certain distance, and the two pin latches receive the slots and prevent the two main arms from being folded. In the folded position, the switch is displaced relative to the grip in the movable space, and the connecting pin is separated from the receiving slot to release the locking relationship of the main arm, and the grip moves along the horizontal direction between the two main frames together with the main connecting seat, so that The main arms are close together and reduce the distance between the two side frames.

Wherein, the main arm comprises: a swinging section, the connecting end is one of two ends of the swinging section; a limiting section is substantially perpendicular to the swinging section and the two are designed as one body, and the receiving groove is formed in the limiting section A pivoting portion is located at the swinging and restricting two-section abutment, and the pivoting portion is rotatable at the other end of the swinging section and connected to the main jointing seat. Therefore, in the deployed position, the restricting sections of the two main arms are aligned to accommodate the latching action of the slot engaging pin to prevent the movement of the swinging section.

The switch also has two elastic members, each of which is mounted in a corresponding guide hole of the grip, the supply pin partially exposes the force required by the grip, and forms a slope at the pin exposed to the grip.

Moreover, each side frame has a top portion, a bottom portion and a longitudinal portion, and the longitudinal portion is fixed between the top of the frame and the bottom portion of the frame. The connecting end of the swinging section is a riser, a riser and a longitudinal section Roughly parallel, the two maintain a rotatable coupling relationship.

Specifically, the main coupling is secured in the middle of a link. The connecting rod has a first end and a second end of the connecting grip, and the second end is connected to a sub-joint. Two jibs, the jibs are rotatably connected to both sides of the sub-joint seat, each jib maintains a pivotal relationship with the corresponding side frame, and the link and the main arm form a link mechanism. Moreover, the sub-joint seat has two side panels facing the main joint seat, and the side panels prevent the corresponding jibs from excessively swinging.

It is not difficult to understand from the above description. This creation provides a folding mechanism for wheelchairs. For the simplification of the rational structure, the non-essential components are reduced, which is not only easy to assemble, but also simple to operate, relatively reducing the production cost and increasing the competitiveness of the market.

Then, based on the detailed description of the related embodiments, the techniques, means and functions employed are described. It is believed that the above objects, structures and features of the present invention can be obtained from a deep and specific understanding.

10‧‧‧Side frame

11‧‧‧ bolt

12‧‧‧ top

14‧‧‧Bottom of the rack

16‧‧‧ longitudinal section

18‧‧‧ convex

20‧‧‧ front wheel

22‧‧‧ front wheel seat

24‧‧‧ Rear wheel

26‧‧·wheels

30‧‧‧ rear wheel seat

32‧‧‧fasteners

34‧‧‧Links

40‧‧‧ linkage

41‧‧‧Combined space

42‧‧‧ first end

43‧‧‧Event space

44‧‧‧ second end

45‧‧‧Filling

46‧‧‧Fixed holes

47‧‧‧ Guide hole

48‧‧‧ grip

50‧‧‧ switch

52‧‧‧ recess

54‧‧‧Flexible parts

56‧‧ ‧ sales

58‧‧‧Bevel

60‧‧‧Main joint

61‧‧‧Support tablets

62‧‧‧ main hole

63‧‧‧ side film

64‧‧‧ screws

65‧‧‧Connected parts

66‧‧‧Flap

68‧‧‧Sub-joint

70‧‧‧ main arm

71‧‧‧ accommodating slot

72‧‧‧swing section

74‧‧‧Restrictions

76‧‧‧ pivotal department

78‧‧‧Connecting end

80‧‧‧ jib

82‧‧‧ pivot end

84‧‧‧Connected end

Figure 1 is a partial exploded view of a preferred embodiment of the present invention.

Figure 2 is an exploded view of the folding portion of the wheelchair.

Figure 3 is a perspective view of the wheelchair after deployment.

Fig. 4 is a cross-sectional view showing the folding portion of the wheelchair when it is unfolded.

Fig. 5 is a cross-sectional view showing another angle when the folding portion of the wheelchair is deployed.

Figure 6 is a schematic view of the operation of the folding portion of the wheelchair.

Figures 7 and 8 are continuous motion diagrams of the folding of the wheelchair.

Referring to Fig. 1, a folding mechanism of a preferred embodiment of the wheelchair is illustrated, which mainly uses a link 40 to join a grip 48, a main coupling 60 and a sub-joint 68. The two main arms 70 are connected to both sides of the main coupling base 60 to be rotatable, and the two auxiliary arms 80 are pivotally connected to the auxiliary coupling seat 68. The two sides are configured to connect the two side frames 10. Therefore, the link 40 is supported by the main arm 70 and the sub-arm 80 between the two side frames 10.

The side frames 10 have substantially the same outline, and each of the side frames 10 is an elongated frame having a top portion 12, a bottom portion 14 and a longitudinal portion 16 secured between the top of the frame and the two portions 12 and 14 of the frame. And a two convex portion 18 is formed at the longitudinal section 16 facing the link 40. A freely rotatable front wheel mount 22 is coupled to the front end of the frame bottom 14 and a rear wheel mount 30 is secured to the outside of the longitudinal section 16 by fasteners 32 such as screws or rivets. The rear wheel base 30 has a coupling rod 34.

In the figure, the wheelchair has two front wheels 20 and two rear wheels 24. Each front wheel 20 is coupled to a front wheel mount 22. The pivot portion of the rear wheel 24 is a hub 26 with the hub 26 engaging the corresponding linkage rod 34 such that the rear wheel 24 is outside of the side frame 10. Although the axes of the front and rear wheels 20, 24 are not at the same height, the diameter of the front wheels 20 is smaller than the diameter of the rear wheels 24 and does not affect the movement of the wheelchair on the ground.

In the second figure, the grip 48 has a joint space 41 and an movable space 43, and a filler 45 is inserted into the joint space 41 of the grip 48. The filler 45 has three side-by-side guide holes 47 that communicate with the movable space 43 of the grip 48, respectively.

The connecting rod 40 has a first end 42 and a second end 44, and the first end 42 passes through a main hole 62 formed in the main joint 60, thereby being inserted and fixed to the guide hole 47 in the middle of the grip 48. A main shaft 60 is secured to the intermediate portion of the connecting rod 40 by a screw 64 through a fixing hole 46 formed in the connecting rod 40 and locked to the main coupling seat 60, so that the main coupling base 60 and the grip 48 can be synchronized. Actuating, the main coupling 60 is held at a distance from the grip 48.

In the present embodiment, the connecting rod 40 is a curved tubular body, and the second end 44 is sleeved with an exposed portion of the coupling member 65 fixed to the secondary coupling seat 68 to reach the connecting rod 40, the grip 48, and the main and auxiliary two. The coupling seats 60, 68 are integrated and can reciprocate linearly along the fourth drawing.

As shown in Figs. 2 and 4, a switch 50 is placed in the movable space 43 of the grip 48, and has a recess 52 at each end. The remaining guide holes 47 of the grip 48 accommodate two elastic members 54 and two pins 56. Each The pin 56 passes through the wall of the grip 48 and is inserted and secured to the corresponding recess 52 of the switch 50, and a bevel 58 is formed at the grip 56 at the grip 48. Because the switch 50 is blocked from the wall of the grip 48, the pin 56 does not leave the grip 48.

In the present embodiment, the resilient member 54 is a compression spring having one end that abuts against the wall of the grip 48 and the other end that bears against the pin 56. The supply pin 56 partially exposes the force required by the guide bore 47 of the grip 48. In some embodiments, the resilient member 54 can be a disc spring or other providing work.

The main coupling seat 60 has two pairs of fins 66, and each pair of fins 66 independently extends from the side of the joint 60 to a distance and is separated by a certain distance. The sub-joint seat 68 also has two pairs of support pieces 61. Each pair of support pieces 61 extends outward from the side of the sub-jointing seat 68 and is spaced apart from each other such that the main and sub-joint joints 60, 68 are substantially identical in shape.

The difference between the primary and secondary secondary couplings 60, 68 is that the secondary coupling seat 68 has two side panels 63, and each side panel 63 is formed at the secondary coupling seat 68 facing the main coupling seat 60, which cooperates with the two side panels. 63 encloses a U-shaped accommodation space.

The main arm 70 is similar to an L-shaped body, defining a long section as a swinging section 72 and a short paragraph as a limiting section 74. The swinging section 72 has a connecting end 78 which is a riser. The riser is placed between the two convex portions 18 and locked by the two bolts 11, so that the connecting end 78 is substantially parallel to the longitudinal section 16 and both Maintain a rotatable connection. The restriction section 74 is substantially perpendicular to the oscillating section 72, which are designed to be unitary and form a receiving groove 71 at the free end of the restriction section 74.

The main arm 70 also has a pivoting portion 76 that is located adjacent to the swinging, restricting two sections 72, 74. The pivoting portion 76 and the connecting end 78 are at different ends of the swinging section 72, and are placed between the two flaps 66 to maintain a rotatable state, so that the main arm 70 is in a deployed position and a folded position relative to the main joint 60. Reciprocating motion.

In the deployed position, the two main arms 70 push the two side frames 10 apart by a certain distance (as in Figure 3). At this moment, the limiting sections 74 of the two main arms 70 are merged, and the two pins 56 enter the corresponding receiving slots 71, facing the main The swinging of the arm 70 creates a latching action that prevents the two main arms 70 from moving toward the folded position.

As shown in Fig. 6, the volume of the switch 50 is smaller than the volume of the movable space 43, the force is moved relative to the grip 48, and the associated pin 56 is separated from the receiving groove 71 to release the locking relationship of the restricting section 74 or the main arm 70. At the same time, the grip 48 moves together with the main coupling base 60 in the horizontal direction (ie, the coordinate X axis of the seventh figure) between the two side frames 10, so that the two main arms 70 are close to each other until the folded position of FIG. The distance between the two side frames 10 is separated.

When the two side frames 10 are pulled outward by force, the two main arms 70 are gradually unfolded from the side-by-side state, and the main coupling seat 60 drives the connecting rod 40 to drive the grip 48 to reverse the X-axis of the coordinate of the figure 7 until the restriction section The end faces of 74 are oriented toward the respective ends of the switch 50 as in Fig. 4. At the same time, the inclined surface 58 does not interfere with the swing of the main arm 70, but can convert the rotational kinetic energy of the restricting portion 74 into the potential energy of the pin 56 retracted into the guide hole 47, so that the elastic member 54 is pressed by the pin 56 to cause deformation.

When the elastic member 54 is released, the pin 56 is displaced toward the restricting portion 74, thereby being caught in the corresponding receiving groove 71 of the restricting portion 74, blocking the swinging portion 72, and returning the main arm 70 to the deployed position.

In addition, the jibs 80 of FIGS. 2, 4, and 5 are defined, and the two ends thereof are defined as a pivoting end 82 and a connecting end 84. The pivoting end 82 is rotatably connected between the two supporting pieces 61, and the connecting end 84 is pivotally connected. The side frame 10 has a corresponding frame top 12. Therefore, the jib 80 is oscillated in the same direction as the main arm 70, and the side frame 10 and the link 40 constitute a four-bar linkage mechanism to support the two side frames 10 to be smoothly folded or unfolded. Of course, the sub-joint 68 prevents the sub-arm 80 from excessively swinging with the side panels 63 while restricting the swing of the main arm 70.

There are other embodiments of the wheelchair folding mechanism of the present invention, and the specific configuration thereof is substantially the same as that of the above embodiment, and the difference lies in: retaining the combination of the connecting rod, the grip, the switch, the pin, the elastic member, the main coupling seat and the main arm. The components, without the sub-joint and jib, still allow the wheelchair to have the equivalent of unfolding, folding and positioning.

Secondly, the length of the connecting rod is shorter than the above embodiment, and the grip is secured to the main joint. The seat maintains a certain distance and does not interfere with the restriction section to swing back and forth to the foot.

It is not difficult to understand from the above description. In this case, the folding mechanism of the wheelchair is simplified for a reasonable structure, and the non-essential components are reduced, which is not only easy to assemble, but also simple in operation, relatively reducing the production cost, and increasing the competitiveness of the market.

10‧‧‧Side frame

12‧‧‧ top

14‧‧‧Bottom of the rack

16‧‧‧ longitudinal section

18‧‧‧ convex

40‧‧‧ linkage

48‧‧‧ grip

50‧‧‧ switch

60‧‧‧Main joint

68‧‧‧Sub-joint

70‧‧‧ main arm

80‧‧‧ jib

Claims (7)

A wheelchair folding mechanism comprises: two side frames (10); a grip (48) having an active space (43) and a plurality of guiding holes (47) respectively communicating with the movable space (43); a switch ( 50), which has two pins (56), when the switch (50) is placed into the movable space (43) of the grip (48), these pins (56) are respectively inserted into the corresponding guide holes (47), through the grip (48) And connecting the two ends of the switch (50); a main coupling seat (60), which is connected to the grip (48) and can be operated synchronously, keeping a certain distance; the two main arms (70), the main arms (70) are connected The main coupling seat (60) is reciprocated in a deployed position and a folded position, and each of the main arms (70) includes a receiving groove (71) and a connecting end (78), and the receiving groove (71) is The connecting end (78) is at a different end of the main arm (70), and the connecting end (78) is coupled to the corresponding side frame (10) to be rotatable; in the deployed position, the two main arms (70) push the two side frames (10) Separate a certain distance, the two pins (56) cooperate with the receiving groove (71) to produce a latching action to prevent the two main arms (70) from being folded; in the folded position, the switch (50) is relatively held in the movable space (43) Displace the (48) and remove the pin (56) from the receiving groove (71) to release the jam of the main arm (70). System, the handle (48) together with the main coupling seat (60) between the horizontal (10) in the second direction side frame, so that the two main arms (70) and the reduction from two opposing closer side frame (10) spaced apart. The wheelchair folding mechanism according to claim 1, wherein the main arm (70) comprises: a swinging section (72), and the connecting end (78) is one of two ends of the swinging section (72). a restriction section (74) which is substantially perpendicular to the oscillating section (72) and which are integrally designed, the accommodating groove (71) being formed on the restriction section (74); a pivotal portion (76) Located at the abutment of the swinging and restricting two sections (72, 74), the pivoting portion (76) is rotatable at the other end of the swinging section (72) and connected to the main joint seat (60); In the deployed position, the restriction sections (74) of the two main arms (70) are aligned to accommodate the latching action of the slot (71) mating pin (56) to prevent movement of the swinging section (72). The wheelchair folding mechanism according to claim 1, wherein the switch (50) further has two elastic members (54), and each elastic member (54) is mounted on a corresponding guide hole of the grip (48) ( In 47), the supply pin (56) partially exposes the force required for the grip (48). The wheelchair folding mechanism according to claim 3, wherein the pin (56) is exposed at the grip (48) to form a slope (56). The wheelchair folding mechanism according to claim 1, wherein each side frame (10) has a top portion (12), a bottom portion (14) and a longitudinal portion (16), and the longitudinal portion (16) Fixed between the top of the rack and the bottom of the rack (12, 14); the connecting end (78) of the swinging section (72) is a riser, the riser is substantially parallel to the longitudinal section (16), and the two are maintained rotatable The connection relationship. The wheelchair folding mechanism according to claim 1, wherein the main coupling seat (60) is firmly fixed in a middle portion of a connecting rod (40) having a coupling grip (48) a first end (42) and a second end (44), the second end (44) being coupled to a pair of coupling seats (68); two arms (80), the jibs (80) being rotatably coupled to the pair On both sides of the coupling seat (68), each of the auxiliary arms (80) maintains a pivotal relationship with the corresponding side frame (10), and cooperates with the connecting rod (40) and the main arm (70) to form a link mechanism. The wheelchair folding mechanism according to claim 6, wherein the sub-joint (68) faces the main joint (60) with two side sheets (61), and the side sheets (61) block corresponding The jib (80) is excessively swung.