CN110613260A

CN110613260A - Angle adjusting and positioning mechanism for chair back

Info

Publication number: CN110613260A
Application number: CN201910934916.7A
Authority: CN
Inventors: 卜耀南
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-09-29
Filing date: 2019-09-29
Publication date: 2019-12-27
Anticipated expiration: 2039-09-29
Also published as: CN110613260B

Abstract

The invention discloses a chair back angle adjusting and positioning mechanism, which comprises a base, a chair seat, a chair back and an adjusting and locking unit, wherein the base is provided with a positioning pipe which is sleeved with a connecting groove; the adjusting and locking unit is provided with a movable rod, a control button, a control cable and a locking device, wherein the movable rod is arranged in the sleeving groove, and a plurality of first convex teeth which are continuously arranged along the axial direction are arranged on the outer side of the movable rod; the front end of the movable rod is pivoted with the front part of the chair seat; the control button is arranged on the base frame; one end of the control cable is connected with the control button; the locking device mainly comprises a locking block and an elastic member, wherein one side of the locking block is provided with a second convex tooth capable of being engaged with the first convex tooth, and the locking block is linked and combined with the control cable; the elastic member provides an engaging elastic force for the first and second teeth; therefore, the invention can be controlled to be locked or unlocked by the control button, and has the effects of conveniently adjusting and positioning the angle of the chair back and stabilizing.

Description

Angle adjusting and positioning mechanism for chair back

Technical Field

The present invention relates to a chair back angle adjusting and positioning mechanism, and more particularly to a chair back angle adjusting and positioning mechanism.

Background

The present leisure chair capable of adjusting sitting and lying is generally provided with a rod on a base, and the rod is sleeved with a locking mechanism capable of moving on the rod, and the locking mechanism is connected with a seat, so that the seat can be adjusted to move and the locking mechanism can correspondingly move along the rod, and after moving to a set position, the locking mechanism is fixed with the rod to position the seat, and the seat is generally linked with a chair back when moving, so that the angle of the common sitting or the angle of the reclining can be adjusted for use.

However, most of the existing locking mechanisms are fixed by a knob to tightly press the rod body, but the screwing mode has inconvenience in operation and is not really lost in positioning when not screwed, and the loosening knob adjustment process is easy to cause inconvenience in adjusting the angle because the chair back with the reclining angle is in a loose state due to the fact that the chair back is greatly reclined to the maximum angle by the gravity of the chair back.

To improve the above-mentioned deficiency, the locking device as in US7735925 comprises a clamp, a positioning block, an adjusting rod, a combination mechanism, wherein the clamp is linked with the chair seat, the chair seat is linked with the chair back, a sleeve hole is provided for sleeving the rod of the chair seat, and a first and a second seat bodies are provided for unfolding and clamping; the positioning block is arranged on the clamp holder, the adjusting rod is combined by the combination mechanism and arranged on one side of the positioning block and is provided with a positioning part connected with the positioning block, so that the adjusting rod can be pivoted to expand the first clamp body and the second clamp body and enable the seat to drive the clamp holder to slide on the rod body, the backward tilt angle of the chair back is changed, the adjusting rod can be pivoted to enable the first seat body and the second seat body to clamp the rod body when the first clamp body and the second clamp body slide to the set position, the positions of the clamp holder and the seat can be locked, and the backward tilt angle of the chair back can be positioned.

The structure can make the first and second seat bodies unfold or the clamping rod body lock in a friction mode by pivoting the adjusting rod, and has the effect of simple and convenient operation, however, when the clamping position is abraded or greasy, the situation that the clamping locking is not firm due to insufficient friction force can be caused, and the adjusting rod also moves correspondingly when the seat and the clamping seat move, so that the hand of a user can not control the adjusting rod according to the habitual position, and if the clamping seat moves to a lying posture formed by moving forward, the user can hold the adjusting rod which moves to the front by lifting the hand to adjust, and has the defect of inconvenient adjustment.

Disclosure of Invention

The present invention is directed to at least one of the problems of the prior art, and provides a structure capable of locking the position of a seat and adjusting and positioning the angle of a backrest, and having better operation convenience and locking stability.

According to an aspect of the present invention, there is provided a chair back angle adjustment positioning mechanism, comprising:

a base, which can be grounded and is provided with a base frame, wherein the base frame is provided with a positioning pipe which protrudes forwards and is sleeved with a connecting groove, the front part of the positioning pipe is provided with an opening, and the side wall of the positioning pipe is provided with a first through hole which penetrates through the connecting groove;

a chair seat arranged at the central position of the base frame;

the chair back is arranged at the rear of the base frame, the lower part of the chair back is pivoted with the rear part of the chair seat, and the side part of the chair back is pivoted with the base frame;

an adjusting and locking unit, which has a movable rod, a control button, a control cable, and a locking device, wherein the movable rod is disposed in the sleeving groove and can axially extend and retract, and a plurality of first convex teeth are axially and continuously arranged on the outer side corresponding to the first through hole; the front end of the movable rod is pivoted with the front part of the chair seat; one end of the control cable is connected with the control button; the locking device mainly comprises a locking block and an elastic piece, wherein the locking block is arranged at the position of the first through hole of the positioning block, one side of the locking block is provided with a second convex tooth which can be meshed with the first convex tooth, and the locking block is linked and combined with the other end part of the control cable; the elastic member provides an elastic force for engaging the first and second teeth to lock the movable rod, and the control button controls the movement of the locking block to disengage the first and second teeth from the unlocking movable rod.

Preferably, the locking device further comprises a bushing which has shock absorption property compared with metal, the bushing is fixedly arranged at the front end of the sleeving groove and cannot rotate corresponding to the sleeving groove, the center of the bushing is provided with a through hole corresponding to the axial direction of the sleeving groove, one side of the through hole is provided with a concave part, and the concave part of the through hole is provided with a second through hole capable of being inserted into one side of the locking block corresponding to the first through hole of the sleeving groove; the movable rod is provided with a convex part corresponding to the concave part of the bushing, the movable rod can be inserted into the through hole of the bushing and can not rotate corresponding to the bushing, and the first convex tooth is arranged on the convex part.

Preferably, a guide wheel with a diameter larger than that of the movable rod and capable of rotating along the inner wall of the sleeving groove is arranged behind the movable rod.

Preferably, the base frame has at least one side frame portion, at least one second pivot portion is disposed above the side frame portion, the control button is disposed on a side of the base frame, and the base frame has a hook portion, and one side of the control button opposite to the hook portion has a ninth pivot portion pivotally connected to the second pivot portion of the base frame.

Preferably, a first pivot part is arranged on the side wall of the positioning tube near the first through hole; the locking device further comprises a pivoting block, the pivoting block is provided with a tenth pivoting part which can be pivoted with the first pivoting part of the positioning tube, an upper plate part and a side plate part are respectively arranged above and at the side of the tenth pivoting part, and the upper plate part is combined with the other end part of the control cable; the side plate is connected to the locking block, and a slot is formed in the center of the locking block for inserting the control cable, and the other end of the control cable is inserted into the slot and combined with the upper plate.

Preferably, the elastic member is disposed between the upper plate portion of the pivot block and the locking block, and provides the pivot block with an actuating elasticity.

Preferably, the elastic member is a telescopic spring, and two ends of the elastic member respectively abut against the inner side of the upper plate part and the top surface of the locking block.

Preferably, an engagement piece is disposed below the first pivot portion, and the engagement piece can be inserted into the loop hole of the control cable.

Preferably, the base further comprises a base and a pillar, the base can be grounded, and the pillar is vertically arranged above the base; the base frame is arranged above the pillar and is provided with a cross frame part, two sides of the cross frame part are respectively provided with a side frame part upwards, and the positioning pipe is arranged in the center of the cross frame part and slants forwards and upwards.

Preferably, a third pivot part is disposed at the rear side of the side frame part of the base frame; the seat has a fourth pivot part in the front center, at least a fifth pivot part in the rear, at least a sixth pivot part pivoted to the fifth pivot part of the seat under the chair back, and seventh pivot parts pivoted to the third pivot part of the base frame on both sides; the front end of the movable rod is provided with an eighth pivot part which is pivoted with the fourth pivot part of the chair seat.

Any one of the technical schemes at least has the following beneficial effects:

when the control button is not hooked, the locking block can make the second convex tooth engage with the first convex tooth of the movable rod by means of elastic force of the elastic component, so as to position the seat position and the back-tilting angle, and when the back-tilting angle is to be changed, the control button can be hooked by hand to drive the control cable and the pivoting block and locking block of the locking device to displace, and make the second convex tooth of the locking block disengage from the first convex tooth, at the same time, the user can make the back-tilting to proper angle, and make the seat drive the movable rod to move forward, and said bushing with better shock absorption property can be cover-connected with the movable rod and its guide wheel, and can be rolled in the cover-connected groove to raise the effect of stabilizing and silencing, and after the control button is released, the second convex tooth can engage with the first convex tooth of the correspondent position, so as to position the seat position and back-tilting angle.

The technical scheme can control locking or unlocking by hooking the control button, is simple and convenient to operate, has better positioning stability compared with the existing clamping mode by meshing and positioning the first convex teeth and the second convex teeth, and has better use convenience by matching with operation habits because the control button is positioned at a fixed position.

Drawings

The invention is further described below with reference to the accompanying drawings and examples;

FIG. 1 is an assembly view of an embodiment of the present invention;

FIG. 2 is a partially exploded view of an embodiment of the present invention;

FIG. 3 is a side view of an embodiment of the present invention;

FIG. 4 is a partial cross-sectional view of an embodiment of the present invention, showing a locked state;

FIG. 5 is a schematic view of the embodiment of the present invention showing the control button being actuated to adjust the angle of the backrest;

FIG. 6 is a partial cross-sectional view of an embodiment of the present invention, shown in an unlocked state;

FIG. 7 is a partial cross-sectional view of an embodiment of the present invention showing the locked state after adjusting the angle of the seat back.

Detailed Description

Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

Referring to fig. 1-4, the present embodiment includes a base 1, a seat 2, a backrest 3, and an adjustable locking unit 4, the base 1 has a base 11, a pillar 12, and a base frame 13, the base 1 can be grounded, and the pillar 12 is vertically disposed above the base 11; the base frame 13 is provided above the support column 12 and is pivotable with respect to the support column 12, and has a cross frame portion 14, and side frame portions 15 are provided on both sides of the cross frame portion 14.

An inclined positioning tube 16 is installed at the center of the cross frame 14 facing forward and upward, a sleeve groove 161 is formed at the center of the positioning tube 16, the front of the engaging slot 161 has an opening 160, and a first pivoting portion 162 is disposed on the front side wall, one side of the first pivot portion 162 is provided with a first through hole 163 communicated with the sleeve slot 161, and a joint piece 164 is disposed under the first pivot portion 162, the engaging piece 164 has a sleeve hole 165, and a bushing 17 is disposed at the front opening 160 of the sleeve groove 161, the bushing 17 may be made of plastic or other shock-absorbing material, which may be better than metal, and may be fixed at the front end of the bushing groove 161 by a coupling member 174, the bushing 17 is not able to rotate corresponding to the receiving groove 161, and the center of the bushing 17 has a through hole 171 corresponding to the axial direction of the receiving groove 161, a concave part 172 is disposed on one side of the through hole 171, and a second through hole 173 is disposed at the position of the concave part 172 of the through hole 171 corresponding to the first through hole 163 of the sleeving groove 161; the side frame part 15 is connected with the side plate 151, a second pivoting part 18 is arranged above the center of the side frame part 15, a stop edge 181 is arranged below the second pivoting part 18, and a third pivoting part 19 is arranged at the rear side of the side frame part 15.

The seat 2 is disposed at the center of the base frame 13, and has a fourth pivot portion 21 at the front center and two fifth pivot portions 22 at the rear.

The backrest 3 is disposed behind the base frame 13, and has two sixth pivoting portions 31 pivotally connected to the fifth pivoting portion 22 of the seat 2 at the lower portion thereof and seventh pivoting portions 32 pivotally connected to the third pivoting portion 19 of the base frame 13 at the two sides thereof.

The adjusting and locking unit 4 has a movable rod 41, a control button 42, a control cable 43, and a locking device 44, wherein the movable rod 41 can be inserted into the engaging slot 161 of the positioning tube 16 and the through hole 171 of the bushing 17, a protrusion 411 is disposed on one side corresponding to the position of the recess 172 of the bushing 17, the movable rod 41 can only extend and retract in the axial direction of the engaging slot 161 without rotating in the engaging slot 161, and a plurality of first teeth 412 are disposed on the protrusion 411 corresponding to the engaging slot 161 and arranged continuously in the axial direction; the front end of the movable rod 41 is provided with an eighth pivot 413 pivoted to the fourth pivot 21 of the seat 2, the front end is provided with a stop post 414 capable of limiting the length of the movable rod 41 and abutting against the front bushing 17 of the positioning tube 16, and the rear end of the movable rod 41 is provided with a guide wheel 415 which has a diameter larger than that of the movable rod 41 and can rotate along the inner wall of the sleeve groove 161.

The control button 42 is disposed on the side of the base frame 13 and has a hook portion 421, a ninth pivot portion 422 pivotally connected to the second pivot portion 18 of the base frame 13 is disposed on one side of the hook portion 421, and a joint hole 423 is disposed on the control button 42.

The control cord 43 has two end portions 431, 432, one end portion 431 of which is combined with the engagement hole 423 of the control knob 42.

The locking device 44 has a pivot block 45, a locking block 46, and an elastic member 47, the pivot block 45 has a tenth pivot portion 451 pivotally connected to the first pivot portion 162 of the positioning tube 16, and an upper plate portion 452 and a side plate portion 453 are respectively disposed above and beside the tenth pivot portion 451, the upper plate portion 452 is disposed with an engagement hole 454, and the other end of the control cable 43 is inserted into the engagement piece 164 of the positioning tube 16 through the engagement hole 165, and the other end 432 is combined with the engagement hole 454 of the upper plate portion 452, the engagement hole 165 can enhance the combination stability of the control cable 43, and the side plate portion 453 is disposed with an engagement hole 455.

The locking block 46 is inserted through the first and second through holes 163, 173 of the positioning tube 16 and the bushing 17 at one side thereof, and has a second protrusion 461 engageable with the first protrusion 412 of the movable rod 41, an attachment hole 462 engageable with the attachment hole 455 of the pivot block 45 by the engagement element 463 is formed at the side opposite to the second protrusion 461, and a slot 464 engageable with the control cable 43 is formed at the center of the locking block 46.

The elastic element 47 is a flexible spring disposed between the upper plate 452 and the locking block 46 of the pivot block 45, and two ends of the elastic element respectively abut against the inner wall of the upper plate 452 and the top wall of the locking block 46, and provide the pivot block 45 and the locking block 46 with operation elasticity.

In this embodiment, when the control button 42 is not hooked, the elastic force of the elastic member 47 can make the second teeth 461 of the locking block 46 engage with the first teeth 412 of the movable rod 41, and can position the seat 2 and the backrest 3 at a reclining angle, and the control button 42 can abut against the stopping edge 181 to position the non-hooked position of the control button 42.

Referring to fig. 5 and 6, in the present embodiment, when the reclining angle of the chair back 3 is to be changed, the control button 42 can be pivoted by the hook portion 421 of the control button 42, but the control button 42 does not move as in the conventional manner at the fixed position in the present embodiment, and the present embodiment can be used conveniently in accordance with the operation habit, and the control button 42 can drive the control cable 43 and the pivot block 45 and the locking block 46 of the locking device 44 to move, and the second tooth 461 of the locking block 46 can be separated from the first tooth 412 and simultaneously compress the elastic member 47, at this time, the user can tilt the chair back 3 backwards to a proper angle, and the chair seat 2 can drive the movable rod 41 to move forward correspondingly, and the bushing 17 with better shock absorption can be sleeved on the movable rod 41 and the guide wheel 415 of the movable rod 41 can roll in the sleeving groove 161, so as to improve the better motion stability and mute effect.

Referring to fig. 6 and 7, after the adjustment of the present embodiment, the pivot block 45 can be pivoted by the elastic force of the elastic member 47 to move the locking block 46 toward the positioning tube 16 by releasing the control button 42, and the second protrusion 461 can be engaged with the first protrusion 412 at the corresponding position to position the seat 2 and the backrest 3 at a reclining angle.

Therefore, the locking or unlocking can be controlled by hooking the control button 42, the operation is simple, the first and second teeth 412, 461 are engaged and positioned without sliding, the positioning stability is better than that of the conventional clamping method, and the control button 42 can be engaged and locked to achieve the better positioning stability when being arranged on the seat 2 or the backrest 3.

Although specific embodiments have been described for illustration, many modifications and variations are possible without departing from the technical scope of the embodiments, which is defined in the appended claims.

Claims

1. Seat back of chair angle adjustment positioning mechanism includes:

a chair seat arranged at the central position of the base frame;

2. The chair back angle adjustment positioning mechanism of claim 1, further comprising a bushing having shock absorption property than metal, the bushing being fixed to the front end of the engaging slot and being non-rotatable with respect to the engaging slot, a through hole being formed in the center of the bushing slot in the axial direction, a recess being formed on one side of the through hole, and a second through hole being formed in the recess of the through hole in the side of the through hole in the position corresponding to the first through hole of the engaging slot; the movable rod is provided with a convex part corresponding to the concave part of the bushing, the movable rod can be inserted into the through hole of the bushing and can not rotate corresponding to the bushing, and the first convex tooth is arranged on the convex part.

3. The chair back angle adjustment positioning mechanism of claim 2, wherein a guide wheel having a larger diameter than the movable rod and capable of rotating along the inner wall of the engaging groove is disposed behind the movable rod.

4. The chair back angle adjustment positioning mechanism of claim 1, wherein the base frame has at least one side frame portion, the side frame portion has at least one second pivot portion thereon, the control button is disposed on a side of the base frame, and has a hook portion, and the opposite side of the hook portion has a ninth pivot portion pivotally connected to the second pivot portion of the base frame.

5. The chair back angular adjustment positioning mechanism of claim 1, wherein the positioning tube has a first pivot portion disposed on a side wall thereof adjacent to the first aperture; the locking device further comprises a pivoting block, the pivoting block is provided with a tenth pivoting part which can be pivoted with the first pivoting part of the positioning tube, an upper plate part and a side plate part are respectively arranged above and at the side of the tenth pivoting part, and the upper plate part is combined with the other end part of the control cable; the side plate is connected to the locking block, and a slot is formed in the center of the locking block for inserting the control cable, and the other end of the control cable is inserted into the slot and combined with the upper plate.

6. The chair back angular adjustment positioning mechanism of claim 5, wherein the resilient member is disposed between the upper plate portion of the pivot block and the locking block and provides flexibility for actuation of the pivot block.

7. The chair back angular adjustment positioning mechanism of claim 6, wherein the resilient member is a retractable spring and has two ends that respectively abut against the inside of the upper plate portion and the top surface of the locking block.

8. The chair back angle adjustment positioning mechanism of claim 5, wherein an engagement piece is disposed below the first pivot portion, and the engagement piece is insertable into the loop hole of the control cable.

9. The chair back angle adjustment positioning mechanism of claim 1, wherein the base further comprises a base, a support, the base being adapted to be grounded, the support being vertically disposed above the base; the base frame is arranged above the pillar and is provided with a cross frame part, two sides of the cross frame part are respectively provided with a side frame part upwards, and the positioning pipe is arranged in the center of the cross frame part and slants forwards and upwards.

10. The chair back angle adjustment positioning mechanism of claim 9, wherein a third pivot portion is disposed behind the side frame portion of the base frame; the seat has a fourth pivot part in the front center, at least a fifth pivot part in the rear, at least a sixth pivot part pivoted to the fifth pivot part of the seat under the chair back, and seventh pivot parts pivoted to the third pivot part of the base frame on both sides; the front end of the movable rod is provided with an eighth pivot part which is pivoted with the fourth pivot part of the chair seat.