TWM530079U - Elastic support adjustment device for chair back reclining - Google Patents

Description

Bounce adjustment device for the back of the chair

The present invention relates to a pivoting portion of a seat base and a seat back support, and a torsion spring for urging the back of the seat to be elasticated, and penetrating through the side of the base of the seat and a content thereof The adjusting screws of the two opposite sliders are respectively screwed to the left and the right, and the opposite sides of the two sliders are provided with abutting blocks which are abutting against the opposite sides and the back end of which is abutted by the torsion springs. Adjusting the rotation of the screw drives the relative movement of the two sliders, causing the torsion force to adjust the torsion force of the torsion spring, so that the seat back combined with the seat back support can obtain different elastic force.

The known office chair is generally provided with a device for adjusting the backrest of the chair. The device mainly comprises a seat base for connecting the seat and a seat back support for connecting the seat back. The two are pivoted together, and then through the compression spring or the torsion spring installed in the seat base, the back pressure of the seat back support is exerted, so that the backward swing of the seat back support is countered by the elastic force. Even if the back of the chair has a resilient leaning effect, for example, Taiwan's TWM244001 (ie, the mainland notice CN2666265Y) patent is a fixed device that can selectively fix the tilting angle of the swinging member (back), when the lifting device's trigger is at the first In the position, the swinging member (back of the seat) cannot be pivoted relative to the body, and the effect of the tilting angle of the fixed swinging member (backrest) is obtained when the trigger of the fixing device is in the second position (the swinging member) The back of the seat can be tilted freely; and the micro-adjustment device can adjust the tilting force of the back of the chair. When the pull rod of the micro-adjusting device is located at the rear, the elastic body is not pulled by the pull rod. At this time, the swinging member (back) The tilting elasticity is soft, when the micro-adjustment device of The drawbar is located at the front and stretches the elastic body, and the tilting force of the swinging member (back of the seat) is hard.

The adjusting device is rotated through the teeth on the rotating rod to drive the teeth at the end of the rotating wheel, so that the screw portion at the other end of the rotating wheel is screwed with the screw hole of the pulling rod, so that the front and rear displacement can be performed, and the rod is suspended. The tightness of the elastic body between the oscillating member and the oscillating member can be adjusted to achieve the soft and hard adjustment of the chair back tilting force.

However, the two teeth (ie, the worm and the worm wheel) for driving the rotating wheel (ie, the screw portion) to rotate and mesh with each other, based on the design of the two driving elements, tend to occupy a large space in the body of the base, the body The design must also consider the adequate accommodation space and the smooth installation structure when rotating, which will cause technical problems in the design and processing precision of the mechanism.

At the same time, the two intermeshing teeth (worm and worm gear) rotating by the screw part are driven, and the worm wheel can rotate one tooth when the worm rotates one turn, which causes the change of the seat back elastic force to be slow, laborious and time consuming. , resulting in operationally inconsistent efficiency requirements.

The reason is that in order to improve the above-mentioned problem that the adjusting device of the known seatback elastic force is more occupied than the assembly space and the adjustment operation is slow, the present invention provides a combination of the central portions of the two central pivots being pivoted together. The seat base of the seat and the back support of the back of the seat, the front end of the seat back is fixed to a front axle which is inserted into the slot formed in the front end of the seat base, and is at the front end of the seat base The content is provided with two opposite sliders, and a resisting block is arranged between the two sliding blocks, and the opposite sides of the front end of the abutting block and the two sliding blocks are provided with abutting oblique abutting edges, and a screw is arranged for the left and right screws. The portion is screwed with the two sliders, and a torsion spring on the front pivot shaft of the upper pivot shaft is pressed against the front shaft and the other lower pressing foot abuts against the rear end of the abutting block, so that Not only can the two sliders move inward or outward relative to each other by adjusting the rotation of the screw, forcing the front and rear displacement of the abutting block to change the torsion force of the torsion spring, and then the rear end of the chair is forced by the front end of the seat back support. The connected seat back can be adjusted by different elastic force, and the entire adjusting device can be installed in the seat base with a small occupied space.

The technical solution adopted by the novel to solve the technical problem is that a central pivot is fixed in the middle of a seat base and a seat back support, and the front end of the seat back support is fixedly connected to the front end of the seat base. a front axle that is guided in the slot, and the upper shaft of the pivot shaft is biased on the front axle, and another lower pressing leg on the spring is pressed against a torsion spring at the rear end of the abutting block. And the opposite sides of the front end of the block are provided with corresponding inclined abutting edges, so as to abut against the oblique abutting edges provided on the corresponding sides of the opposite sliders, and the two opposite sliders are respectively set as left-handed screw holes and right The screw hole is provided, and at the same time, an adjusting screw is provided with a left screw portion and a right screw portion and screwed into the two sliders.

In the above solution, the front end side of the seat base is provided with a side abutting edge and a top abutting edge to form a space for guiding the two opposite sliders and the abutting block, and a guiding groove is arranged on the top abutting edge, and then A convex portion guided in the guiding groove is disposed corresponding to the top surface of the resisting block.

In the above solution, the seat base side is provided with a seat height adjusting wrench and a chair back adjusting adjustment member which are coaxially sheathed together, and the adjusting screw is coaxially disposed therein.

Therefore, the torsion force of the torsion spring is adjusted by the abutting block that is abutted between the two relatively movable sliders in the seat base, and the backrest of the chair is also reversed by the torsion spring. The elastic force can be adjusted, which not only makes the adjustment of the seat back elastic force more rapid and easy, but also enables the entire adjustment mechanism to be accommodated in the seat base with a small volume.

1‧‧‧ seat base

10‧‧‧ slots

11‧‧‧ Side-to-side

12‧‧‧Top

121‧‧‧Guide

2‧‧‧Front back support

3‧‧‧ pivot axis

4‧‧‧Torque spring

41‧‧‧Upper presser foot

42‧‧‧Lamb presser

5‧‧‧ front axle

6‧‧‧ Slider

61‧‧‧ obliquely offset

7‧‧‧

71‧‧‧ obliquely offset

72‧‧‧ convex

81‧‧‧ seat height adjustment wrench

82‧‧‧Front back adjustment wrench

9‧‧‧Adjusting screw

91‧‧‧Left screw

92‧‧‧Right screw

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Figure 1 is a perspective view of the present invention.

2 is a perspective exploded view of the present invention.

Figure 3 is a side cross-sectional view of the present invention.

Figure 4 is a partially exploded perspective view of the chair back adjustment mechanism of the present invention.

FIG. 5 is a schematic cross-sectional view showing the adjustment of the backrest of the present invention.

Referring to FIG. 1 and FIG. 3, the present invention is a base device mounted on the upper end of the chair for coupling the seat, and includes a seat base 1 for fixing the seat and a rear end thereof for connecting. The seat back support 2 of the seat back is disposed at a middle of the seat base 1 and the 2 seat back support 2, and a central shaft 3 is pivoted together, and the central shaft 3 is sleeved The torsion spring 4 is provided with a pressing pin 41 and a lower pressing leg 42. The front end of the seat back 2 is provided with a front axle 5, and the front axle 5 is fitted to the chair. When the seat back support 2 is pivoted with the pivot shaft 3 as a fulcrum in the slot 10 formed at the front end of the base 1, the front axle 5 is vertically displaced in the slot 10.

2 and FIG. 4, the front end of the seat base 1 is provided with a side abutting edge 11 and a top abutting edge 12 to form a space for receiving and guiding, and two phases are arranged in the space. Corresponding to the slider 6, the front end of the two sliders 6 and the end surface of the top end are respectively abutted against the side abutting edge 11 and the top abutting edge 12, and a left-handed screw hole is respectively arranged in the middle of the two sliders 6 One is a right-handed screw hole, and a corresponding oblique abutting edge 61 is disposed at an inner side opposite to the two sliding blocks 6, and a backing block 7 is further disposed on the rear side between the two sliding blocks 6, and the top of the resisting block 7 is made A convex portion 72 is disposed on the surface, and the convex portion 72 is guided to slide in a guiding groove 121 provided on the top abutting edge 12, so that the resisting block 7 can be moved forward and backward along the guiding groove 121, and the resisting block 7 is simultaneously arranged. The front end portion is provided with a corresponding oblique abutting edge 71, and the oblique abutting edges 61 of the sliders 6 on both sides abut each other.

Further, the upper pressing foot 41 of the torsion spring 4 is pressed up on the front shaft 5, and The lower pressing foot 42 of the torsion spring 4 is biased at the rear end of the aforementioned abutting block 7.

Furthermore, a front and rear side of the seat base 1 is provided with a seat height adjustment adjuster 81 for controlling the height of the seat, and a chair back adjustment adjuster 82 for the back of the controllable chair, and The two are coaxially coupled together and mounted on the side of the seat base 1, and an adjusting screw 9 having a corresponding left screw portion 91 and a right screw portion 92 is disposed thereon, so that the adjusting screw 9 is provided. Cooperating coaxially with the seat height adjusting member 81 and extending into the seat base 1 to screw the two sliders 6 respectively of the left-hand screw hole and the right-hand screw hole, and then fixing the end shaft to the end shaft On the seat base 1.

Therefore, as shown in FIG. 5, the two sliders 6 can be moved inward or outward by the forward and reverse rotation of the adjusting screw 9, so that the abutting block 7 of the torsion spring 4 which is pressed by the lower pressing foot 42 is backward or The forward displacement causes the torsion force of the torsion spring 4 to change, so that the upper pressing foot 41 of the torsion spring 4 exerts a different elastic force against the front shaft 5, so that the back of the seat back support 2 is fixed. , the adjustment of different impact forces can be obtained.

At the same time, the adjusting screw 9, the two sliders 6 and the abutting block 7 for adjusting the backrest of the seat back can be accommodated in a narrow space formed by the side abutting edge 11 and the top abutting edge 12 of the seat base 1, that is, The structure of the regulation is not large, so the space required for installation is small, and the design of the seat base 1 can be made easier.

Next, the adjusting screw 9 is coaxially engaged with the seat height adjusting and lowering member 81 and the seat back adjusting adjusting member 82, and the operating portion is located on the same side, thereby allowing the occupant to lean back on the chair. The adjustment of the height of the seat and the positioning of the back angle of the chair is more convenient.

1‧‧‧ seat base

10‧‧‧ slots

11‧‧‧ Side-to-side

12‧‧‧Top

121‧‧‧Guide

2‧‧‧Front back support

3‧‧‧ pivot axis

4‧‧‧Torque spring

41‧‧‧Upper presser foot

42‧‧‧Lamb presser

5‧‧‧ front axle

6‧‧‧ Slider

7‧‧‧

72‧‧‧ convex

81‧‧‧ seat height adjustment wrench

82‧‧‧Front back adjustment wrench

9‧‧‧Adjusting screw

91‧‧‧Left screw

92‧‧‧Right screw

Claims (3)

The springback adjusting device of the back of the chair is a central pivoting of a seat base and a seat back support, and the front end of the seat back seat is fixed to a slot formed at the front end of the seat base. The front guide shaft of the middle guide, wherein: the central shaft is sleeved with a torsion spring, wherein the torsion spring is provided with an upper pressing foot pressed against the front shaft, and the lower pressing foot is pressed against the rear end of the abutting block, And the opposite ends of the front end of the abutting block are provided with corresponding inclined abutting edges, and then two opposite sliders corresponding to the abutting abutting edges are disposed on both sides of the abutting block, and the two opposite sliders are respectively set to be left-handed The screw hole and the right-hand screw hole are repeatedly threaded by the adjusting screw corresponding to the left screw portion and the right screw portion from the seat base side, and are screwed correspondingly to the two sliders. According to the item 1 of the present invention, in the front end side of the seat base, a side abutting edge and a top abutting edge are formed, and a space for guiding the two opposite sliders and the abutting block is formed. And a guiding groove is arranged on the top abutting edge, and a convex portion guided in the guiding groove is arranged corresponding to the top surface of the abutting block. According to the item 1 of the present invention, the backrest adjustment device of the back of the chair, wherein the side of the seat base is provided with a seat height adjusting member and a chair back adjustment adjusting sleeve, and the adjustment is made. The screw concentric is threaded therein.