Telescopic backrest adjusting structure

Abstract

The utility model belongs to the technical field of electric wheelchairs, and particularly relates to a telescopic backrest adjusting structure. The telescopic backrest adjusting structure comprises two oppositely-arranged supports, a plurality of connecting rods are fixedly connected to the two supports, a telescopic device is fixedly connected between the two oppositely-arranged connecting rods, the telescopic device comprises a center pipe and two sleeves, a plurality of inserting holes are formed in the two ends of the center pipe, and the two sleeves are fixedly connected to the two ends of the center pipe. A spring is fixedly connected in a groove formed in one side of the center pipe, one end of the spring is fixedly connected with a positioning block, a plurality of positioning grooves are formed in the inner wall of the sleeve, and when the positioning block moves into one positioning groove, a through hole formed in the sleeve right faces one inserting hole. According to the telescopic backrest adjusting structure provided by the utility model, through the arrangement of the positioning block and the positioning groove, the through hole of the sleeve can be conveniently aligned with the insertion hole of the central tube at one time, and through the arrangement of the sliding block, the central tube is not easy to rotate in the sleeve when moving.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric wheelchairs, and in particular relates to a telescopic backrest adjustment structure. Background Art

[0002] An electric wheelchair is an assistive mobility device designed for people with limited mobility that uses electricity to drive the wheels, helping the user move freely in indoor or outdoor environments. Electric wheelchairs are usually battery-powered and have an adjustable seat, armrests and footrests, as well as various controls such as joysticks or buttons to control the wheelchair's forward, reverse, steering and speed.

[0003] In order to enhance the comfort of the electric wheelchair backrest, some electric wheelchairs have an additional backrest installed on the backrest. The existing installed backrest is generally a fixed structure when in use. The fixed backrest structure has strong limitations when in use and cannot adjust the width of the backrest according to the needs of the user. Therefore, a backrest with adjustable width has also appeared. When adjusting the width, the relative position between the telescopic pipe and the sleeve is adjusted so that the through holes on the telescopic pipe correspond to the through holes on the sleeve, and the connection is achieved by bolts and nuts. However, when the backrest of this structure is in use, the through holes on the telescopic pipe are not easy to align with the through holes on the sleeve at one time, which makes the operation more troublesome. Utility Model Content

[0004] In view of the above problems existing in the prior art, the purpose of the utility model is to provide a telescopic backrest adjustment structure that is easy to operate.

[0005] In order to solve the above problems, the technical solution adopted by the utility model is as follows:

[0006] The telescopic backrest adjustment structure comprises two brackets arranged opposite to each other, and a plurality of connecting rods arranged opposite to each other are fixedly connected to the two brackets, and a telescopic device is fixedly connected between the two connecting rods arranged opposite to each other;

[0007] The telescopic device includes a central tube and two sleeves, the two sleeves are fixedly connected to the two connecting rods, respectively, the two ends of the central tube are respectively arranged in the two sleeves, the two ends of the central tube are provided with a plurality of insertion holes, the side walls of the sleeves are also provided with through holes, the central tube and the sleeves are bolted together, a spring is fixedly installed in a groove provided on one side surface of the central tube, one end of the spring is fixedly connected with a positioning block, the positioning block is an isosceles triangular prism structure at the end away from the spring, and a plurality of positioning grooves are provided on the inner wall of the sleeve to accommodate the end of the isosceles triangular prism structure of the positioning block. When the positioning block moves into one of the positioning grooves, the through hole provided on the sleeve faces one of the insertion holes.

[0008] Preferably, a slider is fixedly connected to the opposite side of the positioning block of the central tube, and one end of the slider is slidably installed in a chute opened on the inner wall of the sleeve.

[0009] Preferably, an adjustment groove distributed in a ring shape is formed on the central tube located above, a rotating device is connected to the central tube at the position of the adjustment groove, and a backing plate is fixedly connected to one side of the rotating device;

[0010] The rotating device includes a fixing frame in a U-shaped structure, a limiting component, and a fixing tube. The fixing tube is fixedly connected to the backing plate, the fixing tube is sleeved on the central tube at the same time, and a rotating ring is fixedly connected to the fixing tube. The rotating ring can rotate in an annular groove formed on the outer surface of the central tube. The fixing frame is fixedly connected to the backing plate, and the limiting component is installed on the fixing frame;

[0011] The limiting component includes a bidirectional screw rod, two moving plates, and two insertion rods. The bidirectional screw rod is rotatably connected to the fixing frame, the two moving plates are respectively threadedly connected to both ends of the bidirectional screw rod, the two insertion rods are respectively fixedly connected to the two moving plates, and the insertion rods can be movably inserted into a through hole formed on the fixing tube and the adjustment groove.

[0012] Preferably, one ends of the two moving plates are movably arranged in a groove formed on the inner wall of the fixing frame, and a handle is fixedly connected to one end of the bidirectional screw rod extending outside the fixing frame.

[0013] Compared with the related art, the telescopic backrest adjustment structure provided by the present invention has the following beneficial effects:

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] In this solution, one end of the central tube is inserted into the sleeve, the slider moves into the chute and slides in the chute. When the positioning block moves, the sleeve squeezes the inclined surface of the positioning block, so that the sleeve moves into the groove of the central tube, and the spring is compressed. When the positioning block moves to the first positioning groove, under the action of the spring, the positioning block moves into the positioning groove. At this time, the through hole of the sleeve corresponds to the first jack of the central tube. If the required width is not at this position, the central tube can be moved continuously. When the through hole of the sleeve is directly opposite to the second jack, the positioning block moves into the positioning groove. If it is the required position, the bolt can be inserted through the through hole of the sleeve and the corresponding jack, and then the nut can be tightened on the bolt.

[0016] When the device is in use, the positioning block and the positioning groove are provided to facilitate the one-time alignment of the through hole of the sleeve and the insertion hole of the central tube, and the slider is provided to prevent the central tube from rotating in the sleeve when moving. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of this structure;

[0018] Figure 2 is a schematic diagram of the structure from another angle;

[0019] Figure 3 This is an exploded schematic diagram of the structure;

[0020] Figure 4 is a cross-sectional schematic diagram of the casing and the central tube;

[0021] Figure 5 for Figure 1 Schematic diagram of the local structure in;

[0022] In the figure: 1- bracket; 2- connecting rod; 3- sleeve; 4- center tube; 5- positioning groove; 6- positioning block; 7- spring; 8- slide groove; 9- slider; 10- support plate; 11- fixed tube; 12- rotating ring; 13- adjusting groove; 14- bidirectional screw; 15- moving plate; 16- plug rod; 17- fixed frame; 18- socket. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with specific embodiments.

[0024] like Figure 1-Figure 5As shown, the telescopic backrest adjustment structure described in the utility model includes two relatively arranged brackets 1, and a plurality of connecting rods 2 are fixedly connected to the two brackets 1. A telescopic device is fixedly connected between the two relatively arranged connecting rods 2. The telescopic device includes a central tube 4 and two sleeves 3. The two sleeves 3 are fixedly connected to the two connecting rods 2 respectively. The two ends of the central tube 4 are respectively arranged in the two sleeves 3. The two ends of the central tube 4 are provided with a plurality of jacks 18. The side walls of the sleeves 3 are provided with through holes. The central tube 4 and the sleeves 3 are connected by bolts and nuts. A spring 7 is fixedly connected in a groove provided on one side of the central tube 4. A positioning block 6 is fixedly connected to one end of the spring 7. The end of the positioning block 6 away from the spring 7 is an isosceles triangular prism structure. The inner wall of the sleeve 3 is provided with a plurality of isosceles triangular prism structures for the positioning block 6. The end portion is moved into the positioning groove 5. When the positioning block 6 is moved into one of the positioning grooves 5, the through hole opened on the sleeve 3 is opposite to one of the insertion holes 18. The center tube 4 is located on the opposite side of the positioning block 6 and is fixedly connected with a slider 9. One end of the slider 9 is slidably arranged in the slide groove 8 opened on the inner wall of the sleeve 3. The slider 9 is arranged so that the center tube 4 is not easy to rotate in the sleeve 3 when it moves. When the positioning block 6 is moving, the sleeve 3 squeezes the inclined surface of the positioning block 6 so that the sleeve 3 moves into the groove of the center tube 4, and the spring 7 is compressed. When the positioning block 6 moves to the first positioning groove 5, under the action of the spring 7, the positioning block 6 moves into the positioning groove 5. At this time, the through hole of the sleeve 3 corresponds to the first insertion hole 18 of the center tube 4, which is convenient for aligning the through hole of the sleeve 3 with the insertion hole 18 of the center tube 4 at one time.

[0025] Among the multiple central tubes 4, the upper central tube 4 is provided with adjustment grooves 13 distributed in a ring shape. A rotating device is connected to the central tube 4 at the position of the adjustment groove 13. One side of the rotating device is fixedly connected with a backing plate 10. The rotating device includes a fixing bracket 17 in a U-shaped structure, a limiting component, and a fixing tube 11. The fixing tube 11 is fixedly connected to the backing plate 10. The fixing tube 11 is sleeved on the central tube 4, and a rotating ring 12 is fixedly connected to the fixing tube 11. The rotating ring 12 can rotate in the annular groove formed on the outer surface of the central tube 4. The fixing bracket 17 is fixedly connected to the backing plate 10. The limiting component is installed on the fixing bracket 17. The limiting component includes a bidirectional screw 14, two moving plates 15, and two inserting rods 16. The bidirectional screw 14 is rotatably connected to the fixing bracket 17. The two moving plates 15 are respectively threadedly connected to both ends of the bidirectional screw 14. The two inserting rods 16 are respectively fixedly connected to the two moving plates 15. The inserting rods 16 can be movably inserted into the through holes formed in the fixing tube 11 and the adjustment grooves 13. One ends of the two moving plates 15 are both movably arranged in the grooves formed on the inner wall of the fixing bracket 17. One end of the bidirectional screw 14 extending to the outside of the fixing bracket 17 is fixedly connected with a handle. When adjusting the angle of the backing plate 10, the backing plate 10 can be rotated. The backing plate 10 drives the fixing tube 11 to rotate on the central tube 4. The rotating ring 12 rotates in the groove of the central tube 4. After rotating to a suitable angle, the handle is rotated to make the bidirectional screw 14 rotate. The two moving plates 15 move closer to each other, and the two inserting rods 16 are both inserted into the through holes of the fixing tube 11 and the adjustment grooves 13.

[0026] The working principle provided by the present utility model is as follows: When using this device, one end of the central tube 4 is inserted into the sleeve 3. At this time, the slider 9 moves into the chute 8 and slides in the chute 8. When the positioning block 6 moves, the sleeve 3 presses against the inclined surface of the positioning block 6, causing the sleeve 3 to move into the groove of the central tube 4, and the spring 7 is compressed. When the positioning block 6 moves to the first positioning groove 5, under the action of the spring 7, the positioning block 6 moves into the positioning groove 5. At this time, the through hole of the sleeve 3 corresponds to the first jack 18 of the central tube 4. If the required width is not at this position, the central tube 4 can be continuously moved. When the through hole of the sleeve 3 is directly opposite to the second jack 18, the positioning block 6 moves into the positioning groove 5. If it is the required position, a bolt can be inserted into the through hole of the sleeve 3 and the corresponding jack 18, and then a nut is tightened on the bolt. When adjusting the angle of the backing plate 10, the backing plate 10 can be rotated. The backing plate 10 drives the fixing tube 11 to rotate on the central tube 4. The rotating ring 12 rotates in the groove of the central tube 4. After rotating to a suitable angle, the handle is rotated to make the bidirectional screw 14 rotate. The two moving plates 15 move closer to each other, and the two inserting rods 16 are both inserted into the through holes of the fixing tube 11 and the adjustment grooves 13, thereby completing the limiting work.

Claims

1. A telescopic backrest adjustment structure, characterized in that: It includes two oppositely arranged brackets, and multiple groups of oppositely arranged connecting rods are fixedly connected to both of the two brackets, and a telescopic device is fixedly connected between two oppositely arranged connecting rods; The telescopic device includes a central tube and two sleeve tubes. The two sleeve tubes are respectively fixedly connected to the two connecting rods. Two ends of the central tube are respectively arranged in the two sleeve tubes. A plurality of jacks are opened at two ends of the central tube. A through hole is also opened on the side wall of the sleeve tube. The central tube and the sleeve tube are bolted. A spring is fixedly installed in a groove opened on one side surface of the central tube. One end of the spring is fixedly connected to a positioning block. The positioning block has an isosceles triangular prism structure at the end far from the spring. A plurality of positioning grooves capable of allowing the end part of the isosceles triangular prism structure of the positioning block to move in are also opened on the inner wall of the sleeve tube. When the positioning block moves into one of the positioning grooves, the through hole opened on the sleeve tube is aligned with one of the jacks.

2. The telescopic backrest adjustment structure according to claim 1, characterized in that: A slider is fixedly connected to the central tube on the opposite side of the positioning block, and one end of the slider is slidably installed in a chute opened on the inner wall of the sleeve tube.

3. The telescopic backrest adjustment structure according to claim 2, characterized in that: An annularly distributed adjustment groove is opened on the central tube located above. A rotating device is connected to the central tube at the position of the adjustment groove, and a backrest is fixedly connected to one side of the rotating device; The rotating device includes a fixing frame in a U-shaped structure, a limiting component and a fixing tube. The fixing tube is fixedly connected to the backrest. The fixing tube is simultaneously sleeved on the central tube, and a rotating ring is fixedly connected to the fixing tube. The rotating ring can rotate in an annular groove opened on the outer surface of the central tube. The fixing frame is fixedly connected to the backrest, and the limiting component is installed on the fixing frame; The limiting component includes a bidirectional screw rod, two moving plates and two insertion rods. The bidirectional screw rod is rotatably connected to the fixing frame. The two moving plates are respectively threadedly connected to two ends of the bidirectional screw rod. The two insertion rods are respectively fixedly connected to the two moving plates. The insertion rods can be movably inserted into the through holes and the adjustment groove opened on the fixing tube.

4. The telescopic backrest adjustment structure according to claim 3, characterized in that: One ends of the two moving plates are both movably arranged in a groove opened on the inner wall of the fixing frame, and a handle is fixedly connected to one end of the bidirectional screw rod extending to the outside of the fixing frame.

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