CN214967921U

CN214967921U - Wheelchair back angle adjustable mechanism

Info

Publication number: CN214967921U
Application number: CN202121594987.6U
Authority: CN
Inventors: 贡瑞金
Original assignee: Jiangsu Changrui Machinery Co ltd
Current assignee: Jiangsu Changrui Machinery Co ltd
Priority date: 2021-07-13
Filing date: 2021-07-13
Publication date: 2021-12-03
Anticipated expiration: 2031-07-13

Abstract

The utility model belongs to the wheelchair field, in particular to a wheelchair back angle adjusting mechanism, which comprises a wheelchair and a chair back hinged on the wheelchair through a rotating shaft; gears are symmetrically and fixedly connected with two ends of the rotating shaft; one side of the gear is provided with a sliding rod in a sliding way along the radial direction, and one end of the sliding rod, which is close to the gear, is fixedly connected with an inserting rod; the sliding rod is connected with a rotating and pulling mechanism which is used for driving the sliding rod to move towards the direction away from the gear so as to enable the inserted rod to be away from the gear; the sliding rod is connected with an automatic return mechanism which is used for driving the sliding rod to move towards the direction close to the gear, so that the inserted rod is inserted between the gear teeth of the gear. The utility model can adjust the chair back by rotating the hand wheel, and lock the chair back by the automatic return mechanism, which is convenient and fast; the utility model can prevent the rotation of the chair back from exceeding the limit by installing the angle limiting mechanism, thereby being beneficial to use; the utility model discloses a mechanism is prevented touching by mistake in the installation, can avoid touching the hand wheel because of the mistake and lead to the back of the chair rotatable, improved the security.

Description

Wheelchair back angle adjustable mechanism

Technical Field

The utility model belongs to the wheelchair field, concretely relates to wheelchair back of chair angle adjustment mechanism.

Background

The wheelchair is a tool for riding instead of walk, which is often used by people with lower limb disabilities and the elderly and infirm, and most wheelchairs are heavy in size at present, and the chair back can not be adjusted, so that the use comfort is reduced.

As publication number CN210355141U discloses a folding wheelchair support with adjustable back of the chair, including collapsible shrink's wheelchair support, the wheelchair support comprises seat support and back of the chair support, and it has the back of the chair connecting portion of two symmetries to articulate on the seat support, back of the chair support mounting is on back of the chair connecting portion, is equipped with the angle adjusting device who is used for adjusting back of the chair support for seat support inclination between seat support and the back of the chair connecting portion, angle adjusting device includes positioning mechanism and arc support piece, positioning mechanism installs on back of the chair connecting portion, and arc support piece's front end is articulated on the seat support, be equipped with the angle modulation hole on the arc support piece, the angle of fixed back of the chair support in the angle modulation hole is inserted in the positioning mechanism activity. The utility model discloses can satisfy the demand of adjusting the back of the chair through angle adjusting device's setting, simple structure, reliable that this structure used moreover has effectively improved user's use impression.

Also, as disclosed in publication No. CN208393177U, a child seat with a seat back angle adjusting function is disclosed, which comprises an angle adjusting device, a seat main body and a seat back, wherein two sides of the seat main body are both provided with a rotating shaft, a connecting plate is arranged at the lower end of the rotating shaft, an installation base is arranged at the lower end of the connecting plate, a manual hydraulic device is arranged at the upper end of the installation base, a seat back is arranged at one side of the seat main body, a safety belt is arranged at one side of the seat back, a connecting shaft is arranged at the lower end of the seat back, an angle adjusting device is arranged at one side of the connecting shaft, scale marks are arranged on the surface of the angle adjusting device, a sliding groove is arranged at one side of the scale marks, a plurality of grooves are arranged at one side of the sliding groove, a fixing cap is arranged at one side of the groove, and by arranging the manual hydraulic device, the seat main body can be driven to incline by the manual hydraulic device, so as to cooperate with the rotating shaft to drive the seat main body to adjust the bottom angle, thereby adjusting the optimal state of keeping the infant sleeping and sitting posture and facilitating the infant sleeping and sitting.

Most of wheelchairs in the prior art need the help of accompanying personnel when the back of the chair is adjusted, and are not beneficial to separate operation; and angle adjustment mechanism among the prior art lacks mistake and touches mechanism and angle stop gear, is unfavorable for using.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides a wheel chair back angle adjustable mechanism.

The utility model provides a following technical scheme:

a wheelchair backrest angle adjustable mechanism comprises a wheelchair and a wheelchair backrest hinged to the wheelchair through a rotating shaft;

gears are symmetrically and fixedly connected to two ends of the rotating shaft; one side of the gear is provided with a sliding rod in a sliding way along the radial direction, and one end of the sliding rod, which is close to the gear, is fixedly connected with an inserting rod;

the sliding rod is connected with a rotating and pulling mechanism which is used for driving the sliding rod to move towards the direction away from the gear so as to enable the inserted rod to be away from the gear;

the sliding rod is connected with an automatic return mechanism which is used for driving the sliding rod to move towards the direction close to the gear, so that the inserted rod is inserted between the gear teeth of the gear.

The rotating and pulling mechanism comprises a first bearing arranged on the wheelchair, and a rotating rod is arranged on the first bearing; a pair of cable discs are symmetrically and fixedly connected to the rotating rod, and a cable is sleeved on each cable disc; one end of the inhaul cable is fixedly connected with the sliding rod through a first reversing wheel and a second reversing wheel.

The dwang is through preventing mistake touching mechanism and hand wheel connection.

The mistaken touch preventing mechanism comprises a mounting seat fixedly connected with the wheelchair, and the mounting seat is provided with a step through hole; one end of the rotating rod penetrates through the second bearing and extends into the stepped through hole; one end of the rotating rod extending into the stepped through hole is fixedly connected with a connecting block, and a clamping block is arranged on the connecting block; a connecting rod is inserted into the other end of the stepped through hole, one end of the connecting rod, which is positioned outside the stepped through hole, is fixedly connected with the hand wheel, and one end of the connecting rod, which is positioned inside the stepped through hole, is fixedly connected with an inserting block which is slidably arranged in the stepped through hole; one end of the insertion block, which is close to the connecting block, is provided with an insertion groove.

The automatic return mechanism comprises a guide block fixedly connected with the wheelchair, and a spring is connected between the guide block and the sliding rod.

And a guide rod is inserted in the spring, one end of the guide rod is fixedly connected with the sliding rod, and the other end of the guide rod penetrates through a guide hole formed in the guide block and extends to the upper part of the guide block.

An angle limiting mechanism is arranged between the chair back and the wheelchair and used for limiting the included angle between the chair back and the cushion of the wheelchair to be a.

The angle limiting mechanism comprises a sliding block which is slidably arranged in a sliding groove arranged on the wheelchair; the slide block is connected with a connecting rod through a hinge, and the other end of the connecting rod is hinged with the chair back.

The range of a is 90-150 degrees.

The utility model has the advantages that:

1. the utility model can adjust the chair back by rotating the hand wheel, and lock the chair back by the automatic return mechanism, which is convenient and fast;

2. the utility model can prevent the rotation of the chair back from exceeding the limit by installing the angle limiting mechanism, thereby being beneficial to use;

3. the utility model discloses a mechanism is prevented touching by mistake in the installation, can avoid touching the hand wheel because of the mistake and lead to the back of the chair rotatable, improved the security.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic structural view of the anti-false touch mechanism of the present invention;

fig. 3 is a schematic view of the installation of the rotating rod of the present invention;

fig. 4 is an installation schematic diagram of the automatic return mechanism of the present invention;

fig. 5 is a schematic view of the chair back of the present invention rotated to 150 °;

fig. 6 is a schematic view of the chair back of the utility model rotated to 90 °.

Labeled as: the wheelchair comprises a wheelchair 101, a chair back 102, a connecting rod 103, a hand wheel 104, a connecting rod 105, a mounting seat 106, an insertion block 107, an insertion block 108, a clamping block 109, a connecting block 110, a second bearing 111, a rotating rod 112, a cable disc 113, a first bearing 114, a cable 115, a sliding groove 116, a sliding block 117, a first reversing wheel 201, a second reversing wheel 202, an insertion rod 203, a gear 204, a rotating shaft 205, a sliding rod 206, a spring 207, a guide block 208 and a guide rod 209.

Detailed Description

As shown in the figure, the wheelchair back angle adjustable mechanism comprises a wheelchair 101 and a chair back 102 hinged on the wheelchair 101 through a rotating shaft 205. The gears 204 are symmetrically and fixedly installed at two ends of the rotating shaft 205, and when the deflection angle of the chair back 102 is adjusted, the rotating shaft 205 rotates, and the gears 204 rotate together. A sliding rod 206 is slidably installed on one side of the gear 204 in the radial direction, and an insertion rod 203 is fixedly installed on one end of the sliding rod 206 close to the gear 204. When the deflection angle of the chair back 102 needs to be adjusted, the sliding rod 206 moves towards the direction away from the gear 204, and the inserted rod 203 is away from the gear teeth of the gear 204, so that the chair back 102 can deflect; when the position of the chair back 102 needs to be fixed, the sliding rod 206 is moved towards the direction close to the gear 204, so that the insertion rod 203 is inserted between the wheel teeth, the gear 204 cannot rotate, and the chair back 102 cannot deflect.

Specifically, the sliding rod 206 is connected with a rotating and pulling mechanism, and the sliding rod 206 can be driven to move in a direction away from the gear 204 by the rotating and pulling mechanism, so that the inserted rod 203 is away from the gear 204. The rotational pulling mechanism includes a first bearing 114 mounted on the wheelchair 101, and the first bearing 114 has the rotating rod 112 mounted thereon. A pair of cable discs 113 are symmetrically and fixedly installed on the rotating rod 112, and a cable 115 is sleeved on the cable discs 113. One end of the inhaul cable 115 is fixedly connected with the sliding rod 206 through the first reversing wheel 201 and the second reversing wheel 202. The rotating rod 112 is rotated to wind the cable 115 on the cable drum 113, and the cable 115 pulls the sliding rod 206 to move the sliding rod 206 away from the gear 204.

In order to solve the problem that the rotating rod 112 abnormally rotates due to accidental touch in daily use, the rotating rod 112 is connected with the handwheel 104 through an accidental touch prevention mechanism. Specifically, the anti-false touch mechanism comprises a mounting seat 106 fixedly mounted with the wheelchair 101, and the mounting seat 106 is provided with a step through hole. And a second bearing 111 is arranged at one end of the stepped through hole, and one end of the rotating rod 112 penetrates through the second bearing 111 and extends into the stepped through hole. One end of the rotating rod 112 extending into the stepped through hole is fixedly connected with a connecting block 110, and a clamping block 109 is arranged on the connecting block 110. A connecting rod 105 is inserted into the other end of the stepped through hole, one end of the connecting rod 105, which is positioned outside the stepped through hole, is fixedly connected with the handwheel 104, and one end of the connecting rod 105, which is positioned inside the stepped through hole, is fixedly connected with an inserting block 107 which is slidably installed inside the stepped through hole. The insertion block 107 has a slot 108 near one end of the connection block 110. The connection rod 105 is inserted from the end of the stepped through-hole having a smaller inner diameter, and the outer diameter of the insertion block 107 is larger than the diameter of the stepped through-hole having a smaller inner diameter. When the rotating rod 112 needs to be rotated, the hand wheel 104 is held, the inserting block 107 is clamped with the connecting block 110, so that the hand wheel 104 is rotated to rotate the rotating rod 112, and then the chair back 102 is adjusted; after the position of the seat back 102 is adjusted, in order to prevent the rotating rod 112 from rotating abnormally due to the accidental touch of the handwheel 104, the handwheel 104 is pulled away from the rotating rod 112 for a certain distance, so that the fixture block 109 is separated from the slot 108. Since the outer diameter of the insertion block 107 is larger than the inner diameter of the smaller inner diameter hole of the stepped through hole, the insertion block 107 is not drawn out.

The sliding rod 206 is connected with an automatic return mechanism, and the sliding rod 206 can be driven to move towards the direction close to the gear 204 by the automatic return mechanism, so that the inserted rod 203 is inserted into the wheel space of the gear 204. Specifically, the self-return mechanism includes a guide block 208 fixedly connected to the wheelchair 101, and a spring 207 is connected between the guide block 208 and the sliding rod 206. When handwheel 104 is turned, slide rod 206 moves away from gear 204 and spring 207 is compressed; after the position of the chair back 102 is adjusted, the handwheel 104 is loosened, the sliding rod 206 returns under the elastic force of the spring 207, so that the inserted rod 203 is inserted between the teeth of the gear 204, and the gear 204 cannot rotate.

In order to improve the motion stability of the sliding rod 206, a guide rod 209 is inserted into the spring 207, one end of the guide rod 209 is fixedly connected with the sliding rod 206, and the other end of the guide rod 209 extends above the guide block 208 through a guide hole formed in the guide block 208. When the sliding rod 206 moves, the guide rod 209 moves in the guide hole, so that the sliding rod 206 can move only in a straight line.

When the tilt angle of the backrest 102 is adjusted, in order to prevent the backrest 102 from rotating over the limit, an angle limiting mechanism is installed between the backrest 102 and the wheelchair 101, and limits the included angle range between the backrest 102 and the seat cushion of the wheelchair 101 to be a. In particular, the angular limit mechanism comprises a slider 117 slidably mounted in a chute 116 provided in the wheelchair 101. The slide block 117 is connected with a connecting rod 103 through a hinge joint, and the other end of the connecting rod 103 is hinged with the chair back 102. When the position of the chair back 102 is adjusted, the connecting rod 103 can drive the sliding block 117 to slide in the sliding groove 116. The range of a is 90-150 degrees, namely when the slide block 117 moves to the leftmost end of the slide groove 116, the included angle between the chair back 102 and the seat cushion of the wheelchair 101 is 90 degrees; when the slide block 117 moves to the rightmost end of the slide groove 116, the included angle between the chair back 102 and the cushion of the wheelchair 101 is 150 degrees

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A wheelchair back angle adjustable mechanism comprises a wheelchair (101) and a chair back (102) hinged to the wheelchair (101) through a rotating shaft (205); the method is characterized in that:

two ends of the rotating shaft (205) are symmetrically fixedly connected with gears (204); a sliding rod (206) is arranged on one side of the gear (204) in a sliding way along the radial direction, and one end of the sliding rod (206) close to the gear (204) is fixedly connected with an inserted rod (203);

the sliding rod (206) is connected with a rotating and pulling mechanism which is used for driving the sliding rod (206) to move towards the direction away from the gear (204) so that the inserted rod (203) is away from the gear (204);

the sliding rod (206) is connected with an automatic return mechanism which is used for driving the sliding rod (206) to move towards the direction close to the gear (204) so that the inserted rod (203) is inserted between the teeth of the gear (204).

2. The wheelchair back angle adjustable mechanism of claim 1, wherein: the rotating and pulling mechanism comprises a first bearing (114) arranged on the wheelchair (101), and a rotating rod (112) is arranged on the first bearing (114); a pair of cable discs (113) are symmetrically and fixedly connected to the rotating rod (112), and a cable (115) is sleeved on each cable disc (113); one end of a pull rope (115) is fixedly connected with the sliding rod (206) through a first reversing wheel (201) and a second reversing wheel (202).

3. The wheelchair back angle adjustable mechanism of claim 2, wherein: the rotating rod (112) is connected with the hand wheel (104) through a false touch prevention mechanism.

4. The wheelchair back angle adjustment mechanism of claim 3, wherein: the false touch prevention mechanism comprises a mounting seat (106) fixedly connected with the wheelchair (101), and the mounting seat (106) is provided with a step through hole; a second bearing (111) is installed at one end of the stepped through hole, and one end of the rotating rod (112) penetrates through the second bearing (111) and extends into the stepped through hole; one end of the rotating rod (112) extending into the stepped through hole is fixedly connected with a connecting block (110), and a clamping block (109) is arranged on the connecting block (110); a connecting rod (105) is inserted into the other end of the stepped through hole, one end of the connecting rod (105) positioned outside the stepped through hole is fixedly connected with the hand wheel (104), and one end of the connecting rod (105) positioned inside the stepped through hole is fixedly connected with an inserting block (107) which is slidably arranged in the stepped through hole; one end of the insertion block (107) close to the connection block (110) is provided with a slot (108).

5. The wheelchair back angle adjustable mechanism of claim 1, wherein: the automatic return mechanism comprises a guide block (208) fixedly connected with the wheelchair (101), and a spring (207) is connected between the guide block (208) and the sliding rod (206).

6. The wheelchair back angle adjustment mechanism of claim 5, wherein: a guide rod (209) is inserted in the spring (207), one end of the guide rod (209) is fixedly connected with the sliding rod (206), and the other end of the guide rod (209) penetrates through a guide hole formed in the guide block (208) and extends to the upper side of the guide block (208).

7. The wheelchair back angle adjustable mechanism of claim 1, wherein: an angle limiting mechanism is arranged between the chair back (102) and the wheelchair (101) and is used for limiting the included angle range between the chair back (102) and the seat cushion of the wheelchair (101) to be a.

8. The wheelchair back angle adjustment mechanism of claim 7, wherein: the angle limiting mechanism comprises a sliding block (117) which is slidably arranged in a sliding groove (116) arranged on the wheelchair (101); the slide block (117) is connected with a connecting rod (103) through a hinge joint, and the other end of the connecting rod (103) is hinged with the chair back (102).

9. The wheelchair back angle adjustment mechanism of claim 7 or 8, wherein: the range of a is 90-150 degrees.