CN213607552U

CN213607552U - Constant angle retaining mechanism for wheelchair armrest

Info

Publication number: CN213607552U
Application number: CN202022702302.7U
Authority: CN
Inventors: 张彬; 王玉庆; 兰小青; 路兰兰; 尹小伟; 刘建民
Original assignee: Henan Yiheng Medical Equipment Co ltd
Current assignee: Henan Yiheng Medical Equipment Co ltd
Priority date: 2020-11-20
Filing date: 2020-11-20
Publication date: 2021-07-06
Anticipated expiration: 2030-11-20

Abstract

The utility model provides a wheelchair handrail constant angle hold mechanism, including the lift post, connect the seat on the lift post, the back of the chair frame, fixedly connected with crank on the back of the chair frame, articulated between crank and the seat through the articulated shaft A of left right direction rotate to be connected, it is articulated between linear drive device's one end and the crank, the other end articulates on the lift post, articulated on the articulated shaft A have a corner piece, articulated shaft A and corner piece's pin joint is located the corner position of corner piece, it has connecting rod A to articulate at a limit A tip of corner piece, connecting rod A's the other end articulates on the lift post, it has connecting rod B to articulate at another limit B tip of corner piece, connecting rod B's the other end and handrail frame fixed connection, handrail frame pass through and form between articulated shaft B and the back of the chair frame and rotate and be. In the process of adjusting the angle of the chair back of the wheelchair, the armrests can keep a constant angle.

Description

Constant angle retaining mechanism for wheelchair armrest

Technical Field

The utility model relates to a wheelchair, in particular to an armrest mechanism on a wheelchair, which belongs to the technical field of machinery.

Background

The wheelchair is a common tool in the process of nursing for the old and transferring patients, in order to adapt to the needs of patients, the prior wheelchair can carry out seat lifting, seat angle adjustment and chair back angle adjustment, the lifting is generally carried out by driving a lifting column at the lower part of the seat to lift, the angle adjustment of the chair back is generally realized by driving the chair back to rotate through a crank connecting rod mechanism by a linear driving device (an air spring, an electric cylinder, an electric push rod, a linear motor and the like), a crank has a rotating fulcrum, the adjustment of the seat angle is generally realized by hinging the bottom of the seat on the lifting column, the linear driving device is arranged between the lifting column and the bottom of the seat, both ends of the linear driving device are generally hinged, after the chair back rotates, the armrests at both sides of the wheelchair are required to keep the original angle, because the armrests can cause users to feel uncomfortable along with the rotation of the, the handrail angle on many wheelchairs at present keeps relying on artifical the regulation, and many angular adjustment structure angular adjustment are discontinuous moreover, can't adjust to the optimal condition with patient's adaptation, when there is upper limbs disease or upper limbs dysfunction in the wheelchair user, the patient need be touched to the mode of this kind of manual adjustment, probably triggers patient's sick affected part, makes the patient experience not good, can't adjust to the optimal angle and can make the patient feel uncomfortable, influences its psychosomatic impression.

Disclosure of Invention

The utility model aims to overcome the above-mentioned problem that present wheelchair handrail adjustment exists, provide a wheelchair handrail constant angle hold mechanism.

In order to realize the purpose of the utility model, the following technical proposal is adopted: a constant angle keeping mechanism for wheelchair armrest comprises a lifting column, a seat connected on the lifting column, a back frame, a crank fixedly connected on the back frame, the crank is rotatably connected with the seat through a hinge shaft A in left and right directions, one end of a linear driving device is hinged with the crank, the other end of the linear driving device is hinged on the lifting column, a corner piece is hinged on the hinge shaft A, the hinge point of the hinge shaft A and the corner piece is positioned at the corner part of the corner piece, a connecting rod A is hinged at one side A end part of the corner piece, the other end of the connecting rod A is hinged on the lifting column, the hinge point of the linear driving device and the lifting column, the hinge point of the connecting rod A and one side A end part of the corner piece and the central point of the hinge shaft A form a four-point parallelogram, a connecting rod B is hinged at the other side B end part of the corner piece, and, the armrest frame is rotationally connected with the chair back frame through the hinge shaft B, and the hinge point of the end part of the other side B of the corner piece and the connecting rod B, the fixed point between the connecting rod B and the armrest frame, the central point of the hinge shaft B and the central point of the hinge shaft A form another parallelogram.

Further, the method comprises the following steps of; the end part of the handrail frame is provided with an arc-shaped seam, a pin shaft is fixedly connected to the connecting rod B, the pin shaft is inserted into the arc-shaped seam, a locking device is connected to the pin shaft, and the position of the pin shaft in the arc-shaped seam can be adjusted by loosening the locking device.

Further, the method comprises the following steps of; the articulated shaft A is directly or indirectly fixedly connected on the seat.

Further, the method comprises the following steps of; the seat is fixedly connected with a bracket, and the articulated shaft A is fixedly connected on the bracket.

The utility model discloses an actively beneficial technological effect lies in: in the process of adjusting the angle of the chair back of the wheelchair, the armrests can keep a constant angle.

Drawings

Figure 1 is one of the schematic views of the mechanism on a wheelchair.

Figure 2 is a second schematic view of the mechanism on a wheelchair.

Detailed Description

In order to explain the utility model more fully, the utility model provides an implementation example. These examples are merely illustrative of the present invention and do not limit the scope of the present invention.

The invention is explained in further detail with reference to the drawings, in which the reference symbols are: 1: a lifting column; 2: a seat; 3: a back of chair frame; 4: a crank; 5: a support; 6: a hinged shaft A; 7: a linear drive device; 8: a corner fitting; 9: edge A; 10: a connecting rod A; 11: edge B; 12: a connecting rod B; 13: a handrail frame; 14: a hinged shaft B; 15: the hinge point of the linear driving device and the lifting column; 16: the hinge point of the connecting rod A and the lifting column; 17: the connecting rod A is hinged with the end part of one edge A of the corner piece; 18: the end part of the other side B of the corner piece is hinged with the connecting rod B; 19: a fixed point between the connecting rod B and the armrest frame; 20: an arc-shaped seam; 21: and (7) a pin shaft. The linear driving device in the application can adopt an electric push rod.

As shown in the attached drawings, the constant angle maintaining mechanism for the wheelchair armrest comprises a lifting column 1, a seat 2 connected to the lifting column, a back frame 3, a crank 4 fixedly connected to the back frame, and a hinge shaft a6 rotatably connected between the crank and the seat in the left-right direction, wherein the hinge shaft a is directly or indirectly fixedly connected to the seat, in the embodiment, a bracket 5 is fixedly connected to the seat, and the hinge shaft a is fixedly connected to the bracket.

One end of the linear driving device 7 is hinged with the crank 4, the other end is hinged with the lifting column 1, a corner piece 8 is hinged with the hinge shaft A, the hinge point of the hinge shaft A and the corner piece is positioned at the corner part of the corner piece, a connecting rod A10 is hinged at the end part of one edge A9 of the corner piece, the other end of the connecting rod A10 is hinged with the lifting column 1, and a parallelogram is formed by the hinge point 15 of the linear driving device and the lifting column, the hinge point 16 of the connecting rod A and the lifting column, the hinge point 17 of the connecting rod A and the end part of one edge A of the corner piece, and the four-point center point of the hinge shaft A.

The end part of the other side B11 of the corner piece is hinged with a connecting rod B12, the other end of the connecting rod B is fixedly connected with the armrest frame 13, the end part of the armrest frame is provided with an arc-shaped seam 20, a pin shaft 21 is fixedly connected with the connecting rod B12 and inserted in the arc-shaped seam, a locking device is connected with the pin shaft, the locking device is loosened, the position of the pin shaft in the arc-shaped seam can be adjusted, the locking device can adopt a nut, the nuts are screwed on the pin shafts on two sides of the arc-shaped seam to realize locking, and after the locking, the pin shaft is fixedly connected with the armrest frame.

The armrest frame is rotatably connected with the backrest frame 3 through a hinge shaft B14, in the embodiment, the hinge shaft B is fixedly connected with the backrest frame, and a hinge point 18 between the end part of the other side B of the corner piece and the connecting rod B, a fixed point 19 between the connecting rod B and the armrest frame, the central point of the hinge shaft B and the central point of the hinge shaft A form another parallelogram.

The linear driving device on the mechanism needs a configurable power supply and a controller driven by the power supply.

The mechanism adopts two parallel four-bar linkage mechanisms which are mutually related, the initial angle of the handrail can be adjusted through the position of the pin shaft in the arc-shaped seam, after the angle is set, the handrail frame is constantly parallel to the side B, the side A is constantly parallel to the lifting column, and the included angle between the side A and the side B is fixed, so that the handrail can keep a constant angle in the process of adjusting the angle of the seat back of the chair.

After the embodiments of the present invention have been described in detail, those skilled in the art can clearly understand that various changes and modifications can be made without departing from the scope and spirit of the above claims, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention all fall within the scope of the technical solution of the present invention, and the present invention is not limited to the embodiments of the examples given in the specification.

Claims

1. The utility model provides a constant angle retaining mechanism of wheelchair handrail, includes lift post, connects the seat on the lift post, back of the chair frame, its characterized in that: a crank is fixedly connected on the chair back frame, the crank is rotationally connected with the chair through a hinge shaft A in the left-right direction, one end of a linear driving device is hinged with the crank, the other end of the linear driving device is hinged with the lifting column, the hinge shaft A is hinged with a corner piece, the hinge point of the hinge shaft A and the corner piece is positioned at the corner part of the corner piece, a connecting rod A is hinged at the end part of one side A of the corner piece, the other end of the connecting rod A is hinged with the lifting column, the hinge point of the linear driving device and the lifting column, the hinge point of the connecting rod A and the end part of one side A of the corner piece and the central point of the hinge shaft A form a parallelogram, a connecting rod B is hinged at the end part of the other side B of the corner piece, the other end of the connecting rod B is fixedly connected, the hinge point of the end part of the other side B of the corner piece and the connecting rod B, the fixed point between the connecting rod B and the handrail frame, the central point of the hinge shaft B and the central point of the hinge shaft A form another parallelogram.

2. A wheelchair armrest constant angle retention mechanism of claim 1, wherein: the end part of the handrail frame is provided with an arc-shaped seam, a pin shaft is fixedly connected to the connecting rod B, the pin shaft is inserted into the arc-shaped seam, a locking device is connected to the pin shaft, and the position of the pin shaft in the arc-shaped seam can be adjusted by loosening the locking device.

3. A wheelchair armrest constant angle retention mechanism of claim 1, wherein: the articulated shaft A is directly or indirectly fixedly connected on the seat.

4. A wheelchair armrest constant angle retention mechanism of claim 1, wherein: the seat is fixedly connected with a bracket, and the articulated shaft A is fixedly connected on the bracket.