CN217161503U - Chair back lifting mechanism convenient to adjust - Google Patents

Abstract

The utility model discloses a chair back lifting mechanism convenient to adjust, which comprises a chair seat rear frame extending vertically and a chair back frame sleeved on the chair seat rear frame and capable of sliding up and down; an adjusting block with an adjusting structure is arranged in the chair back frame, and the adjusting block can move upwards to a first station, can move movably and downwards to a second station and keeps still; the chair seat rear frame is provided with a vertically extending adjusting groove, the side edge of the adjusting groove is communicated with a plurality of layers of gear grooves inclined to the adjusting groove, and the adjusting structure is inserted in the adjusting groove or the gear grooves; when the adjusting block is positioned at the first station and the chair back frame slides upwards, the adjusting structure can slide into the adjusting groove from the gear groove of the current layer, and the chair back frame is provided with an elastic piece for driving the adjusting block to reset and enabling the adjusting structure to slide into the gear groove of the previous layer; the upper/lower end of the adjusting groove can push the adjusting structure to enable the adjusting block to enter the second station/the first station. The beneficial effects of the utility model reside in that, simple structure is difficult for taking place mechanical failure.

Description

Chair back lifting mechanism convenient to adjust

Technical Field

The utility model relates to a back of chair elevating system, especially the back of chair elevating system convenient to adjust.

Background

Office chairs or leisure chairs are usually provided with a plurality of structures which can be adjusted by users according to their own use habits or comfort, for example, a lifting mechanism is arranged on the chair back to adjust the height of the chair back so as to adapt to users with different heights.

Prior art publication number is CN 208875767U's patent application discloses a back of chair altitude mixture control mechanism, include the tailboard and the slider of being connected with the back of the chair, the tailboard includes bolt seat and the base of being connected with the cushion, the bolt seat with base integrated into one piece, be equipped with in the slider and supply the slider is followed gliding track about the base, be equipped with the gear groove of two rows of cockscombs on the base, free articulated in the slider have can with gear groove meshing's first gear lock tooth and second gear lock tooth.

The height adjusting mechanism can realize the height adjustment of the chair back by pulling the chair back upwards and automatically engaging the gear locking teeth with the gear grooves with corresponding heights. However, the following drawbacks exist: the first gear locking tooth and the second gear locking tooth are respectively clamped into the gear grooves on two sides under the elastic action of the elastic component between the first gear locking tooth and the second gear locking tooth, so that the first gear locking tooth and the second gear locking tooth are required to be bilaterally symmetrical in structure or clamping action, the fault tolerance rate is low, and mechanical faults are easy to occur; the locking and unlocking of the first gear locking tooth and the second gear locking tooth are completed through the clamping and embedding or separation of the cylindrical boss and the arc-shaped clamping groove, the first gear locking tooth and the second gear locking tooth can be used for a long time, and for example, the first gear locking tooth and the second gear locking tooth are deformed to cause the situation that the first gear locking tooth and the second gear locking tooth cannot be clamped and embedded.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a back of chair elevating system convenient to adjust, simple structure is difficult for taking place mechanical failure.

The utility model discloses a realize through following technical scheme.

A chair back lifting mechanism convenient to adjust comprises a chair seat rear frame which extends vertically and a chair back frame which is sleeved on the chair seat rear frame and can slide up and down; an adjusting block with an adjusting structure is arranged in the chair back frame, and the adjusting block can move upwards to a first station, can move movably and downwards to a second station and keeps still; the chair seat rear frame is provided with a vertically extending adjusting groove, the side edge of the adjusting groove is communicated with a plurality of layers of gear grooves inclined to the adjusting groove, and the adjusting structure is inserted in the adjusting groove or the gear grooves; when the adjusting block is positioned at the first station and the chair back frame slides upwards, the adjusting structure can slide into the adjusting groove from the gear groove of the current layer, and the chair back frame is provided with an elastic piece for driving the adjusting block to reset and enabling the adjusting structure to slide into the gear groove of the previous layer; the upper/lower end of the adjusting groove can push the adjusting structure to enable the adjusting block to enter the second station/the first station.

As a further improvement of the utility model, the inner surface of the back wall of the chair back frame is provided with a groove, and the adjusting block is arranged in the groove; the grooves comprise main grooves and second grooves communicated with the lower sides of the main grooves, the upper and lower lengths and the left and right widths of the main grooves are larger than those of the adjusting blocks, and the left and right widths of the main grooves are larger than those of the second grooves; the adjusting block moves upwards, is completely positioned in the inner groove and can move left and right, and the main groove forms a first station; and when the lower end of the adjusting block is clamped in the second groove and is kept static, the main groove and the second groove form a second station.

As a further improvement of the utility model, the grooves further comprise a third groove communicated with the side edge of the main groove; the elastic piece is arranged in the third groove and supports the adjusting block.

As a further improvement of the utility model, the groove also comprises a first groove communicated with the upper side of the main groove, the left and right width of the main groove is larger than that of the first groove, and the left and right width of the first groove is larger than the upper end of the adjusting block; the adjusting block moves upwards, the upper end of the adjusting block extends into the first groove, and the main groove and the first groove form a first station when the adjusting block rotates under the action of the elastic piece by taking a first external corner structure formed by the main groove and the first groove as a fulcrum.

As a further improvement of the utility model, the left and right width of the second groove is larger than the lower end of the adjusting block; the adjusting block moves downwards, and when the upper end and the lower end of the adjusting block respectively abut against the side edges of the first groove and the second groove and keep static under the action of the elastic piece, the main groove, the first groove and the second groove form a second station.

As the utility model discloses a further improvement, the side that the regulating block is close to first external corner structure is protruding to the outside and is formed first internal corner structure, and the angle of first internal corner structure is greater than first external corner structure for the restriction regulating block is around first external corner structure pivoted range.

As a further improvement, the upper end of the adjusting block is close to the limit groove formed by inwards sinking the side of the elastic part, and the elastic part is supported in the limit groove.

As a further improvement, the outside arch of lower extreme side of regulating block is formed with the reentrant corner structure of second, and the angle of the reentrant corner structure of second equals the second external corner structure that main recess and second recess formed for when the regulating block moves down with the mutual inlay card cooperation of second external corner structure.

As a further improvement of the present invention, the inner surface of the back wall of the seat back frame is located the left and right sides of the groove are provided with the vertically extending clamping plates, and the back surface and the left and right sides of the seat back frame are respectively attached to the inner surface of the back wall of the seat back frame and the two clamping plates.

As a further improvement of the utility model, the chair seat rear frame comprises a rear frame plate, a plurality of reinforcing ribs and a front cover plate; the back surface, the left side and the right side of the rear frame plate are respectively attached to the inner surface of the rear wall of the chair back frame and the two clamping plates; the adjusting groove is formed on the rear frame plate; the plurality of reinforcing ribs are arranged on the front surface of the rear frame plate; the front cover plate is fixed on the reinforcing ribs and is attached to the inner surface of the front wall of the seat back frame.

The utility model has the advantages that:

the utility model has simpler structure, less mechanical action and reduced mechanical failure rate; the switching of first station and second station is carried out through reciprocating of regulating block to realize the switching of locking state and unblock state, use the loss lower, the user state is also more reliable and more stable.

Drawings

The preferred embodiments of the present invention will hereinafter be described in detail to facilitate an understanding of the objects and advantages of the invention, with reference to the accompanying drawings, in which:

FIG. 1 is a perspective view of a chair back lifting mechanism;

FIG. 2 is an exploded view of the chair back lift mechanism from one perspective;

FIG. 3 is an exploded view of the chair back lift mechanism from another perspective;

FIG. 4 is a schematic view of the conditioning block in a first station;

FIG. 5 is a schematic view of the conditioning block in a second station.

Detailed Description

The invention is explained in more detail below with reference to the drawings and exemplary embodiments.

The terms of orientation of up, down, left, right, front, back, top, bottom, and the like as referred to or as may be referred to in this specification are defined with respect to the configuration shown in the drawings, and the terms "inner" and "outer" refer to directions toward and away from the geometric center of a particular component and are relative terms, and thus may be changed accordingly depending on the position and the state of use of the particular component. Therefore, these and other directional terms should not be construed as limiting terms.

Referring to fig. 1-5, a chair back lifting mechanism convenient to adjust comprises a chair seat rear frame 1 and a chair back frame 2, wherein the chair seat rear frame 1 extends vertically, the front end of the chair seat rear frame is fixedly connected with a chair seat, and the chair back frame 2 is of a hollow structure and is sleeved on the chair seat rear frame 1 and can slide up and down. Be provided with regulating block 3 in the back of the chair frame 2, regulating block 3 is last to have regulation structure 31, regulating block 3 can reciprocate in the certain limit, and regulating block 3 can get into two kinds of different stations in this within range, marks as first station and second station respectively, regulating block 3 upwards removes and can gets into first station, and regulating block 3 that is in first station can be relative back of the chair frame 2 activity, regulating block 3 downwards removes and can get into the second station, and regulating block 3 that is in the second station is for back of the chair frame 2 motionless.

Be equipped with vertical extension's adjustment tank 61 on seat support rear frame 1, the side intercommunication of adjustment tank 61 has the gear groove 62 of multilayer slope in adjustment tank 61 to gear groove 62 inclines downwards by the root of intercommunication adjustment tank 61 to its tip, the regulation structure 31 of regulating block 3 is inserted and is established in adjustment tank 61 or gear groove 62. When the adjusting structure 31 is inserted into the gear slots 62, the height of the back frame 2 is defined, and the number of the gear slots 62 defines the number of layers of the back frame 2 with adjustable height. When the adjusting block 3 is at the first station and the back frame 2 slides upwards, the adjusting structure 31 can slide into the adjusting groove 61 from the gear groove 62 on the current layer, and the back frame 2 is provided with the elastic element 4 for driving the adjusting block 3 to reset and enabling the adjusting structure 31 to slide into the gear groove 62 on the previous layer. The adjusting structure 31 can only move from the shift position groove 62 on the current floor to the shift position groove 62 on the previous floor, but cannot move to the shift position groove 62 on the next floor, that is, the backrest frame 2 can only adjust the height and lock layer by layer from bottom to top, but cannot adjust the height from top to bottom. The upper/lower end of the adjustment groove 61 pushes the adjustment structure 31 so that the adjustment block 3 enters the second/first station. When the adjusting structure 31 is from the gear groove 62 on the uppermost layer, the upward sliding of the seat back frame 2 enables the adjusting structure 31 to slide into the adjusting groove 61 from the gear groove 62 on the uppermost layer and then to abut against the upper end of the adjusting groove 61, the upward sliding of the seat back frame 2 is continued, the upper end of the adjusting groove 61 pushes the adjusting structure 31, the adjusting block 3 moves downward relative to the seat back frame 2 and enters the first station from the second station, at this time, the adjusting structure 31 cannot slide into the gear groove 62, and the seat back frame 2 and the seat back frame 1 are in an unlocking state, so that the seat back frame 2 can freely slide up and down along the seat back frame 1. When the back frame 2 is slid downwards until the lower end of the adjusting groove 61 abuts against the adjusting structure 31, the back frame 2 is slid downwards, the lower end of the adjusting groove 61 pushes the adjusting structure 31, so that the adjusting block 3 moves upwards relative to the back frame 2 and enters the first station, and at this time, under the driving of the elastic element 4, the adjusting structure 31 slides into the gear groove 62 at the bottommost layer.

Compared with the prior art, the chair back frame 2 is locked in height by sliding the locking structure into the gear groove 62, the structure is simpler, the mechanical action is less, and the probability of mechanical failure is lower. This application is through adjusting block 3 and at present to reciprocating of back of the chair frame 2, carries out the switching of first station and second station to realize the switching of locking state and unblock state, to adjusting block 3 and regulation structure 31, there is not loss of use's problem basically, consequently life is longer, and the user state is also more reliable and more stable.

Furthermore, a groove is formed in the inner surface of the rear wall of the seat back frame 2, the groove is formed by inwards recessing the surface of the rear arm, and the adjusting block 3 is arranged in the groove. The groove comprises a main groove 5 and a second groove 52, the main groove 5 and the second groove 52 are both in a direction structure, and the adjusting block 3 is in a slender structure with narrow left and right width and long up and down length. The second groove 52 is communicated with the lower edge of the main groove 5, and the left-right width of the main groove 5 is larger than that of the second groove 52. The adjusting block 3 moves upwards and can move left and right when being completely positioned in the main groove 5, and the main groove 5 forms a first station. The adjusting block 3 moves downwards, the lower end of the adjusting block is clamped in the second groove 52, the adjusting block 3 cannot move at the moment, namely the adjusting block is kept static relative to the backrest frame 2, and the main groove 5 and the second groove 52 form a second station.

The groove further comprises a third groove 53, the third groove 53 is communicated with the side edge of the main groove 5, the elastic piece 4 is arranged in the third groove 53, two ends of the elastic piece are respectively supported on the side edge of the third groove 53 and the side edge of the adjusting block 3, and a pressure spring is preferably used for the elastic piece 4. When the adjusting block 3 is located at the first station, i.e. the adjusting block 3, and the backrest frame 2 slides upwards, the gear groove 62 on the current layer pushes the adjusting structure 31 to enable the adjusting block 3 to move beyond the third groove 53, the elastic part 4 is gradually compressed, after the adjusting structure 31 slides into the adjusting groove 61, the elastic force of the elastic part 4 drives the adjusting part to move reversely and reset, so that the adjusting part is clamped into the gear groove 62 on the previous layer.

The side that the upper end of regulating block 3 is close to elastic component 4 inwards caves in and forms spacing groove 32, and spacing length is set for according to the distance that regulating block 3 actually can reciprocate, and the one end of elastic component 4 supports in spacing groove 32, and spacing groove 32 plays the limiting displacement to elastic component 4, can avoid the slippage of elastic component 4.

In a further optimization of the first station, the grooves further comprise a first groove 51, and the first groove 51 is communicated with the upper edge of the main groove 5. The left-right width of the main groove 5 is larger than that of the first groove 51, and the left-right width of the first groove 51 is larger than that of the upper end of the adjusting block 3. The side edge of the first groove 51 and the upper edge of the main groove 5 form a first external corner structure A1, the adjusting block 3 moves upwards, the upper end of the adjusting block extends into the first groove 51, and the main groove 5 and the first groove 51 form a first working position when the adjusting block rotates under the action of the elastic piece 4 by taking the first external corner structure A1 as a fulcrum. Through setting up first recess 51, the activity restriction when being in first station regulating block 3 is for using first external corner structure A1 as the rotation of fulcrum, can reduce the uncertainty of regulating block 3 for back of the chair frame 2 activity orbit to the gliding stability and the reliable degree of regulating block 3 along gear groove 62 have been improved, mechanical failure rate is further reduced.

Still further, the side edge of the adjusting block 3 close to the first external corner structure a1 protrudes outward to form a first internal corner structure B1, the angle of the first internal corner structure B1 is greater than that of the first external corner structure a1, so as to limit the rotation range of the adjusting block 3 around the first external corner structure a1, the moving accuracy of the adjusting block 3 and the adjusting structure 31 can be improved, and the stability of the back of the chair frame 2 in heightening and shifting is further improved.

The second station can be further optimized due to the provision of the first recess 51. The left and right width of the second groove 52 is larger than the lower end of the adjusting block 3, the adjusting block 3 moves downwards, and under the action of the elastic piece 4, when the upper end and the lower end of the adjusting block respectively abut against the side edges of the first groove 51 and the second groove 52 and keep static, the main groove 5, the first groove 51 and the second groove 52 form a second station. Make the lower extreme of regulating block 3 need not the inlay card in second recess 52 on the one hand, reduced friction loss between them, on the other hand, the upper and lower both ends of regulating block 3 obtain the support of first recess 51, second recess 52 side respectively, have avoided regulating block 3 under the elastic force effect of elastic component 4, owing to the whole horizontal tilt's that leads to under the upper end free no stress state trend.

The outside arch of lower extreme side of regulating block 3 is formed with second reentrant corner structure B2, and the angle of second reentrant corner structure B2 equals second external corner structure A2 that main recess 5 and second recess 52 formed, and when regulating block 3 moved down and got into the second station, second reentrant corner structure B2 can block in second external corner structure A2, has improved the stability that regulating block 3 is in under the second station.

In addition, the inner surface of the back wall of the seat back frame 2 is provided with the vertically extending clamping plates 21 at the left side and the right side of the groove, and the back surface and the left side and the right side of the seat back frame 1 are respectively attached to the inner surface of the back wall of the seat back frame 2 and the two clamping plates 21, so that the seat back frame 2 cannot deflect in the left-right direction relative to the seat back frame 1 no matter in an unlocking state or a locking state.

Seat support after-frame 1 includes back frame plate 11, a plurality of strengthening rib 12, front shroud 13, the back of back frame plate 11, the left and right sides laminate respectively on internal surface, two cardboard 21 of back frame 2 back wall, adjustment tank 61 forms on back frame plate 11, and a plurality of strengthening ribs 12 set up the front at back frame plate 11, front shroud 13 is fixed on strengthening rib 12 and the laminating is on the internal surface of back frame 2 antetheca to the overall structure's that back frame 2 and seat support after-frame 1 constitute fastness and stability have been improved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments can be modified, or some technical features can be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A chair back lifting mechanism convenient to adjust is characterized by comprising a chair seat rear frame which extends vertically and a chair back frame which is sleeved on the chair seat rear frame and can slide up and down; an adjusting block with an adjusting structure is arranged in the chair back frame, and the adjusting block can move upwards to a first station, can move movably and downwards to a second station and keeps still; the chair seat rear frame is provided with a vertically extending adjusting groove, the side edge of the adjusting groove is communicated with a plurality of layers of gear grooves inclined to the adjusting groove, and the adjusting structure is inserted in the adjusting groove or the gear grooves; when the adjusting block is positioned at the first station and the chair back frame slides upwards, the adjusting structure can slide into the adjusting groove from the gear groove of the current layer, and the chair back frame is provided with an elastic piece for driving the adjusting block to reset and enabling the adjusting structure to slide into the gear groove of the previous layer; the upper/lower end of the adjusting groove can push the adjusting structure to enable the adjusting block to enter the second station/the first station.

2. The adjustable chair back lifting mechanism as recited in claim 1, wherein a groove is formed on an inner surface of the back wall of the chair back frame, and the adjusting block is disposed in the groove; the grooves comprise main grooves and second grooves communicated with the lower sides of the main grooves, the upper and lower lengths and the left and right widths of the main grooves are larger than those of the adjusting blocks, and the left and right widths of the main grooves are larger than those of the second grooves; the adjusting block moves upwards, is completely positioned in the inner groove and can move left and right, and the main groove forms a first station; and when the lower end of the adjusting block is clamped in the second groove and is kept static, the main groove and the second groove form a second station.

3. The adjustable chair back riser mechanism of claim 2, wherein the recess further comprises a third recess communicating with the side of the main recess; the elastic piece is arranged in the third groove and supports the adjusting block.

4. The chair back lifting mechanism convenient to adjust of claim 3, wherein the upper end of the adjusting block is recessed inwardly near the side of the elastic member to form a limiting groove, and the elastic member is supported in the limiting groove.

5. The chair back lifting mechanism convenient to adjust as recited in claim 3, wherein the groove further comprises a first groove communicated with the upper side of the main groove, the left-right width of the main groove is larger than that of the first groove, and the left-right width of the first groove is larger than that of the upper end of the adjusting block; the adjusting block moves upwards, the upper end of the adjusting block extends into the first groove, and the main groove and the first groove form a first station when the adjusting block rotates under the action of the elastic piece by taking a first external corner structure formed by the main groove and the first groove as a fulcrum.

6. The easy-to-adjust chair back lift mechanism of claim 5, wherein the second groove has a greater lateral width than the lower end of the adjustment block; the adjusting block moves downwards, and when the upper end and the lower end of the adjusting block respectively abut against the side edges of the first groove and the second groove and keep static under the action of the elastic piece, the main groove, the first groove and the second groove form a second station.

7. The chair back lifting mechanism convenient to adjust of claim 5, wherein the side edge of the adjusting block near the first external corner structure protrudes outwards to form a first internal corner structure, and the angle of the first internal corner structure is larger than that of the first external corner structure so as to limit the rotation amplitude of the adjusting block around the first external corner structure.

8. The chair back lifting mechanism convenient to adjust as claimed in claim 6, wherein the lower end side of the adjusting block is formed with a second internal corner structure protruding outwards, and the angle of the second internal corner structure is equal to a second external corner structure formed by the main groove and the second groove, so that the adjusting block is engaged with the second external corner structure when moving downwards.

9. The adjustable chair back lifting mechanism as claimed in claim 2, wherein the inner surface of the back frame rear wall is provided with vertically extending clamping plates at the left and right sides of the groove, and the back surface, the left and right sides of the chair seat rear frame are respectively attached to the inner surface of the back frame rear wall and the two clamping plates.

10. The adjustable chair back lift mechanism of claim 9, wherein the chair seat back frame comprises a back frame plate, a plurality of ribs, a front cover plate; the back surface, the left side and the right side of the rear frame plate are respectively attached to the inner surface of the rear wall of the chair back frame and the two clamping plates; the adjusting groove is formed on the rear frame plate; the plurality of reinforcing ribs are arranged on the front surface of the rear frame plate; the front cover plate is fixed on the reinforcing ribs and is attached to the inner surface of the front wall of the seat back frame.

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