CN110464562A - A kind of rotary positioning mechanism of wheel-chair - Google Patents

Abstract

The invention relates to a rotation positioning mechanism of a wheelchair, which is used for the seat of the wheelchair to rotate relative to the chassis of the wheelchair. The rotation mechanism includes a seat bottom plate, a rotating shaft, a chassis and a locking unit. On the chair bottom, the upper end of the rotating shaft is fixed on the seat bottom, and the lower end is rotatably connected to the chassis. The chassis is provided with a positioning hole. The locking unit includes a handle and a guide pin. The pin is arranged in the middle of the handle, and when the handle is turned, the lower end of the guide pin can be inserted into the positioning hole; the rotating mechanism of the present invention has a simple structure and is convenient for realizing the locking and unlocking of the rotating shaft and the chassis.

Description

A rotary positioning mechanism for a wheelchair

technical field

The invention relates to a rotating mechanism of a wheelchair, belonging to the technical field of wheelchair structure design.

Background technique

Electric wheelchairs are usually driven by rear wheels, and the front wheels are universal wheels. The passing performance of electric wheelchairs of this design is poor on complex road surfaces; limited by the turning radius, it is difficult for existing wheelchairs to turn around on narrow road surfaces. Wheelchairs with swivel functions can already overcome the above problems. When passing through complex roads, you only need to rotate the seat 180° to turn it into a front-wheel drive, which can enhance the passability of complex roads; when you need to turn around on narrow roads, you only need to rotate Seat can be realized, get rid of the limitation of turning radius. However, the existing wheelchair with rotating function, especially the wheelchair with rotating driving function, combines the upper seat and the vehicle body through a relatively complicated mechanical connection, and the seat and the vehicle body become an integral body and cannot Separated, unless mechanically disassembled, thus inconvenient for portability, transportation and maintenance.

Contents of the invention

In order to solve the problems in the prior art, the present invention provides a rotating mechanism of a wheelchair that is simple in structure and convenient for locking and unlocking.

In order to achieve the above object, the technical solution proposed by the present invention is: a rotary positioning mechanism of a wheelchair, which is used for the seat of the wheelchair to rotate relative to the chassis of the wheelchair, and the rotary positioning mechanism includes a seat bottom plate, a rotating shaft, a chassis and a lock The seat of the wheelchair is fixed on the seat bottom, the upper end of the rotating shaft is fixed on the seat bottom, and the lower end is rotatably connected to the chassis. The chassis is provided with a positioning hole. The locking unit includes a handle and a guide pin. , a lock pin frame and a connecting plate, one end of the lock pin frame is fixed on the rotating shaft, the other end is provided with a guide hole, the lower end of the connecting plate is hinged on the lock pin frame, and the upper end is hinged with one end of the handle; the guide pin passes through the The handle is hingedly arranged at the position where the handle matches the positioning hole, and is slidably connected in the guide hole. The handle rotates downward around the hinge point with the connecting plate, the lower end of the guide pin can be inserted into the positioning hole, and the seat bottom is positioned on the chassis.

The locking unit further includes a spring, the spring is sleeved on the guide pin, and the upper end of the spring abuts against the lock pin frame, and the lower end abuts against the guide pin, and the elastic force of the spring makes the guide pin protrude downward.

Two positioning holes are provided, and the two positioning holes are respectively arranged on a positioning seat, and the two positioning seats are symmetrically arranged on the chassis on opposite sides of the rotating shaft.

The rotation positioning mechanism also includes an anti-rotation frame, the anti-rotation frame is fixed on the chassis and is on one side of the positioning seat, when the lock pin frame is against the anti-rotation frame, the lower end of the guide pin is inserted into the positioning hole.

A vertical plate extends upward from one side of the positioning seat, and when one side of the lock pin frame is against the vertical plate, the lower end of the guide pin is inserted into the positioning hole.

The bottom of the lock pin frame is provided with a groove at the guide hole, the lower end of the guide pin is connected with a retaining ring, the upper end of the spring is against the bottom surface of the groove, and the lower end is against the retaining ring.

The lock pin frame is provided with a connection hole, which is located at the other end of the lock pin frame relative to the guide hole. Or the symmetrical sides are provided with the first screw hole communicating with the connecting hole, the first screw hole is in the radial direction of the connecting hole perpendicular to the length direction of the lock pin frame; the rotating shaft is provided with a connecting part adapted to the connecting hole , and the radial position of the connecting part corresponding to the first screw hole is provided with a waist-shaped groove arranged in the axial direction, the lower end of the connecting part is provided with a positioning shoulder, and the connecting hole of the lock pin frame is sleeved on the connecting part of the rotating shaft. Axially positioned on the shoulder of the positioning shaft, the screw is screwed into the first screw hole and the end is tightly against the bottom surface of the waist-shaped groove, so that the lock pin frame is fixed on the rotating shaft.

The lock pin frame is also provided with a second screw hole, and the second screw hole and the first screw hole are located in the axial direction of the same connecting hole; the lower end of the connecting plate is provided with a through hole, and the screw is screwed through the through hole. Connected in the second screw hole, connecting the connecting plate on the lock pin frame; when the second screw hole is set below the first screw hole, the screw screwed in the first screw hole sinks below the corresponding first screw hole in the hole.

One end of the handle close to the rotating shaft is provided with ears on both sides, which are symmetrically arranged on both sides of the rotating shaft and hinged to a connecting plate respectively.

The seat bottom plate is provided with an offset tapered sleeve, and the upper end of the rotating shaft is provided with a conical surface adapted to the taper of the tapered sleeve. The seat bottom plate is pluggable and relatively non-rotating through the combination of the tapered sleeve and the tapered surface. Connected to the upper end of the shaft.

The lower end of the rotating shaft is rotationally connected with the chassis through a tapered roller bearing. .

The beneficial effects of the present invention are:

The rotating mechanism of the present invention realizes the locking and unlocking operations between the rotating shaft and the chassis through the simple structure of the handle and the guide pin, and has a simple structure and convenient operation.

The invention can make the seat rotate 180°, that is, the rear wheel drive can be changed into the front wheel drive, and the passability of complex road surfaces can be enhanced.

In the present invention, the seat is only plugged and connected with the rotating shaft, which is convenient for disassembly; the seat can be tilted backward by a small angle through the taper of the taper sleeve and the taper of the rotating shaft, making the seat more comfortable, and at the same time realizing the seat and the rotating shaft. synchronous rotation.

Description of drawings

FIG. 1 is a schematic structural view of Embodiment 1 of the present invention;

FIG. 2 is a schematic structural diagram of Embodiment 2 of the present invention;

Fig. 3 is a schematic diagram of unlocking the locking unit in Fig. 2;

Fig. 4 is a schematic diagram of seat inclination in Fig. 2;

Fig. 5 is a partially enlarged view of the guide pin part in Fig. 2;

Fig. 6 is a partial enlarged view of the connecting plate part in Fig. 2;

Fig. 7 is a schematic diagram of the structure of the handle in Fig. 2;

Fig. 8 is a schematic diagram of the connection between the rotating shaft and the lock pin frame in Fig. 1;

Fig. 9 is a schematic diagram of the structure of the lock pin frame in Fig. 1;

Fig. 10 is the front view of the anti-rotation frame in the third embodiment;

Fig. 11 is a top view of the anti-rotation frame in the third embodiment.

1-seat bottom plate, 2-handle, 21-side ear, 3-taper sleeve, 4-guide pin, 5-spring, 6-tapered roller bearing, 7-chassis, 8-lock pin frame, 81-connection hole, 82-first screw hole, 83-second screw hole, 84-waist groove, 85-positioning shoulder, 86-connecting part, 87-guide hole, 9-anti-rotation frame, 10-connecting plate, 11-rotating shaft , 12-spring retaining ring, 13-groove, 14-locating seat, 15-riser, 16-locating hole.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Embodiment one

As shown in Figure 1, a kind of rotary positioning mechanism of wheelchair vehicle of the present embodiment is used for the seat of wheelchair vehicle to rotate relative to the chassis of wheelchair vehicle, and this rotary positioning mechanism comprises seat bottom plate 1, rotating shaft 11, chassis 7 and lock The locking unit includes a handle 2, a guide pin 4, a locking pin frame 8 and a connecting plate 10. The seat of the wheelchair is fixed on the seat bottom 1, the rollers are arranged on the bottom of the chassis 7, and the upper end of the rotating shaft 11 is fixed on the seat. The upper and lower ends of the bottom plate 1 are rotatably connected to the chassis 7 through bearings. The chassis 7 is provided with a positioning hole 16. One end of the lock pin frame 8 is fixed on the rotating shaft 11, and the other end is provided with a guide hole. The lower end of the connecting plate 10 is hinged on the lock pin frame. 8, the upper end is hinged with one end of the handle 2; the guide pin 4 is arranged on the position where the handle 2 matches the positioning hole 16 by being hinged with the handle 2, and is slidably connected in the guide hole; turning the handle 2 makes the handle wrap around and connect The hinge point of the plate 10 turns downward, the guide pin 4 slides downward along the guide hole, and the lower end can be inserted into the positioning hole 16, the seat bottom plate 1 is positioned on the chassis, and the handle 2 is turned upward, the guide pin 4 slides upward along the guide hole, and the lower end Sliding the positioning hole 16, the seat bottom plate 1 can rotate relative to the chassis through the rotating shaft.

Embodiment two

As shown in Figure 2, the structure of a wheelchair rotating mechanism of this embodiment is basically the same as that of Embodiment 1. The difference is that an offset taper sleeve 3 is provided at the bottom of the seat floor, and the cone of the taper sleeve 3 The angle between the axis of the hole and the plane where the seat is located is 8°. The upper end of the rotating shaft 11 is provided with a tapered surface that cooperates with the taper sleeve 3, and is fixed on the seat bottom plate 1 by matching with the taper of the taper sleeve 3. The rotating shaft 11 is vertically arranged. The lower end is rotatably connected to the chassis 7 through the tapered roller bearing 6, so that the seat can be tilted back at a small angle (8°), making the seat more comfortable, and at the same time, the force on the tapered sleeve 3 is uneven when it contacts the conical surface of the rotating shaft 11 , rotating the seat can simultaneously drive the rotating shaft 11 to rotate, as shown in FIG. 4 .

In this embodiment, the locking unit also includes a spring 5. As shown in FIG. 6 and FIG. Two connecting plates 10 lower ends are respectively hinged on both sides of one end of the lock pin frame 8, and the handle 2 is provided with two side ears 21 near the rotating shaft 11. The ears 21 on both sides are hinged; as shown in Fig. 5, the guide pin 4 is slidably connected in the guide hole, the upper end of the guide pin 4 passes through the guide hole and is hinged in the middle of the handle 2, and the lower end passes through the guide hole and is fixed with a retaining ring 12, The bottom of the lock pin frame 8 is provided with a groove 13 at the guide hole, the spring 5 is sleeved on the guide pin 4, and the upper end is against the groove at the bottom of the lock pin frame 8, and the lower end is against the spring retaining ring 12, and the chassis 7 is provided with a positioning seat 14, and the positioning seat 14 is provided with a positioning hole, and the lower end of the guide pin 4 is located in the positioning hole. Lift up the end of the handle 2 away from the rotating shaft as shown in Figure 3, the handle 2 drives the guide pin 4 to slide upward, and compresses the spring into the groove, the lower end of the guide pin 4 is separated from the positioning hole, and the rotating shaft 11 and the chassis 7 are unlocked. The rotating shaft 11 and the chassis 7 can rotate relatively, thereby driving the seat to rotate; loosen the handle, the spring 5 rebounds, pushes the guide pin 4 to slide downward, inserts the lower end of the guide pin 4 into the positioning hole, locks the rotating shaft 11 and the chassis 7, and the seat Cannot be turned.

As shown in Figures 8 and 9, the lock pin frame 8 is provided with a connection hole 81, which is located at the other end of the lock pin frame relative to the guide hole, and the connection direction between the center of the connection hole and the center of the guide hole is the direction of the lock pin. In the lengthwise direction of the frame, one side or symmetrical sides of the connecting hole 81 are provided with a first screw hole 82 communicating with the connecting hole, and the first screw hole 82 is in the radial direction of the connecting hole perpendicular to the lengthwise direction of the lock pin frame; 11 is provided with a connecting portion 86 adapted to the connecting hole, and a waist-shaped groove 84 arranged in the axial direction is provided at the radial position of the connecting portion 86 corresponding to the first screw hole 82, and a positioning shoulder is provided at the lower end of the connecting portion 86 85, the connecting hole 81 of the lock pin frame 8 is sleeved on the connecting part 86 of the rotating shaft 11 and positioned axially on the positioning shoulder 85, the screw is screwed into the first screw hole 82 and the end is tightly against the waist groove 84 The bottom surface of the groove makes the lock pin frame 8 fixed on the rotating shaft 11, and the rotating shaft 11 can drive the lock pin frame 8 to rotate together.

As shown in FIG. 8 , the lock pin frame 8 is also provided with a second screw hole 83 , the second screw hole 83 is located in the same axial direction as the first screw hole 82 , and the second screw hole 83 is located in the first screw hole 82 . Above a screw hole 82 ; the lower end of the connecting plate 10 is provided with a through hole, and the screw passes through the through hole and is screwed into the second screw hole 83 to connect the connecting plate on the lock pin frame 8 . If the second screw hole 83 is disposed below the first screw hole 82 , the screw screwed to the first screw hole sinks into the counterbore corresponding to the first screw hole, providing space for the installation of the connecting plate 10 .

In this embodiment, since the two ends of the connecting plate 10 are respectively hinged on the handle 2 and the lock pin frame 8, when the handle 2 is lifted, the upper end of the connecting plate 10 can rotate toward the side close to the guide pin 4, thereby ensuring that the guide pin 4 is always Movement in the vertical direction.

In this embodiment, there are two positioning seats 14, and the two positioning seats 14 are symmetrically arranged on the chassis 7 on both sides of the rotating shaft 11. The chassis 7 is fixed with an anti-rotation frame 9 on one side of the positioning seat 14. Drive the locking unit to rotate together. When the lock pin frame 8 was on the anti-rotation frame 9, the lower end of the guide pin 4 was facing the positioning hole on the positioning seat 14. At this time, the handle 2 was released, and the lower end of the guide pin 4 can be positioned on the locating seat 14. The spring 5 is just inserted into the positioning hole, and the anti-rotation frame 9 can locate the rotation of the rotating shaft 11, which saves the trouble of aligning the positioning hole, and is easy and simple to operate. Since the two positioning seats 14 and the rotating shaft are on the same straight line, the rotation angle of the rotating shaft 11 is 180° so that the wheelchair is converted between the front-wheel drive and the rear-wheel drive.

Embodiment Three

As shown in Fig. 10 and Fig. 11, the structure of this embodiment is basically the same as that of Embodiment 1, the difference is that in this embodiment, a vertical plate 15 extends upward from one side of the positioning seat 14, and when one side of the lock pin frame 8 abuts against When on the riser 15, the lower end of the guide pin 4 is inserted into the positioning hole.

The technical solutions of the present invention are not limited to the above-mentioned embodiments, and all technical solutions obtained by adopting equivalent replacement methods fall within the protection scope of the present invention.

Claims (11)

1. a kind of rotary positioning mechanism of wheel-chair, the seat for wheel-chair is rotated relative to the chassis of wheel-chair, and feature exists In: including seat plate, shaft, chassis and locking unit, the seat of wheel-chair is fixed on seat plate, and shaft upper end is fixed On seat plate, lower end is rotatably connected on chassis, the chassis be equipped with location hole, the locking unit include handle, Guide pin, lock pin frame and connecting plate, lock pin frame one end are fixed in shaft, and the other end is equipped with pilot hole, the connecting plate Lower end is hinged on lock pin frame, and upper end and handle one end are hinged；The guide pin is by being hingedly set to handle with handle and determining It on the position of position hole adaptation, and is slidably connected in pilot hole, handle is rotated down around with connecting plate hinge joint, guide pin lower end It can be inserted into location hole, seat plate positions on chassis.

2. the rotary positioning mechanism of wheel-chair according to claim 1, it is characterised in that: the locking unit further includes bullet Spring, the spring pocket is on guide pin, and upper end is against on lock pin frame, and lower end is against on guide pin, and the elastic force of spring makes to be oriented to Pin extends downwardly.

3. the rotary positioning mechanism of wheel-chair according to claim 2, it is characterised in that:, should there are two the location hole is set Two location holes are separately positioned on a positioning seat, and two positioning seats are symmetrically disposed on the chassis of opposite shaft two sides.

4. the rotary positioning mechanism of wheel-chair according to claim 3, it is characterised in that: the rotary positioning mechanism further includes Anti- pivoted frame, anti-pivoted frame is fixed on chassis and in positioning seat side, and when lock pin frame is against on anti-pivoted frame, guide pin lower end is inserted Enter location hole.

5. the rotary positioning mechanism of wheel-chair according to claim 3, it is characterised in that: the positioning seat side upwardly extends A riser out, when lock pin frame side is against on riser, location hole is inserted into guide pin lower end.

6. the rotary positioning mechanism of wheel-chair according to claim 4 or 5, it is characterised in that: leading lock pin frame bottom Groove is equipped with to hole, the guide pin lower end is connected with check ring, and the spring upper end is against the groove bottom of groove, lower end It is against on check ring.

7. the rotary positioning mechanism of wheel-chair according to claim 2, it is characterised in that: the lock pin frame is equipped with connection Hole, the connection hole is on another end position that lock pin frame is oppositely oriented hole, the line side in the connecting hole center of circle and the pilot hole center of circle To the length direction for lock pin frame, connecting hole side or symmetrical two sides are equipped with the first screw hole being connected to connecting hole, the first screw hole In the radial direction in the connecting hole vertical with lock pin frame length direction；The shaft is equipped with the connection being adapted to connecting hole Portion, and it is equipped with axially disposed kidney slot in the radially position that interconnecting piece corresponds to the first screw hole, interconnecting piece lower end is equipped with Positioning shaft shoulder, the connecting hole of lock pin frame are socketed on the interconnecting piece of shaft and the axially position in positioning shaft shoulder, and screw is screwed on first Screw hole and end are closely against the groove bottom of kidney slot, are fixed on lock pin frame in shaft.

8. the rotary positioning mechanism of wheel-chair according to claim 7, it is characterised in that: be additionally provided with second on the lock pin frame Screw hole, second screw hole and the first screw hole are located on same connecting hole axial direction；The connecting plate lower end is equipped with through-hole, screw It is screwed in the second screw hole across through-hole, connects connecting plate on lock pin frame；In the second screw hole, the lower section of the first screw hole is set When, the screw for being rotatably connected in the first screw hole is sunken in the counterbore of corresponding first screw hole.

9. the rotary positioning mechanism of wheel-chair according to claim 7, it is characterised in that: the handle is set close to shaft one end There are two to pick up the ears, two, which pick up the ears, is symmetrically disposed on the two sides of shaft, and hinged with a connecting plate respectively.

10. the rotary positioning mechanism of wheel-chair according to claim 1, it is characterised in that: the seat plate is equipped with biasing Tapered sleeve, the shaft upper end is equipped with the conical surface that be adapted to the tapered sleeve taper, and seat plate passes through the combination of tapered sleeve and the conical surface It is pluggable and be connected to shaft upper end relative to no rotation.

11. the rotary positioning mechanism of wheel-chair according to claim 1, it is characterised in that: the shaft lower end passes through circular cone Roller bearing and chassis are rotatablely connected.