TWM480321U - Seatback leaning elasticity adjustment device - Google Patents

Description

The back of the chair leans against the elastic adjustment device

The present invention relates to an elastic unit mounted between a chassis for mounting a chair foot and a seat back seat for mounting the seat back, and a torsion spring on the elastic unit and an adjusting device for the torsion spring pair chair The elastic reaction force of the back support can be adjusted according to personal preference.

Generally speaking, the back of the office chair is generally provided with a seat back that can be resiliently reclined, and the device for elastically reclining the back of the chair, as shown in the publication No. M422356, is installed. The base of the chair foot is pivoted to a seat back support for mounting the seat back, and a spring is arranged between the chassis and the seat back support, and the upper end of the spring is abutted against a chair The upper retainer on the back support, and the lower end of the spring is abutted on the lower retainer, and the lower retainer is held by an adjusting screw screwed at the corresponding position of the chassis.

When the back support of the seat back is tilted back with the back of the seat, the seat back support exerts an elastic reaction against the compression of the spring, so that the back of the seat has a resilient leaning effect, thereby increasing the comfort of the occupant while leaning; Through the up and down adjustment of the adjusting screw, the elastic reaction force of the spring can be obtained to meet the individual needs.

However, the mounting method of the above spring may cause the spring to be in a curved compression state after the seat back support swings backward, resulting in a large radial stress on the adjusting screw of the lower retaining plate, which is easy to adjust the screw portion of the screw. Wear and even bending deformation, causing the adjustment screw to not rotate and lose the adjustment function.

At the same time, when the seat back support swings repeatedly with the back of the chair, the adjusting screw It is also subject to the radial stress reversal, which is also likely to cause loosening of the adjusting screw, so that the adjusted seat back leans against the elastic force, and the change is made to reduce the comfort of the leaning.

The reason is that in order to improve the above-mentioned elastic backrest device and its elastic adjustment method, it is easy to cause looseness and damage of the adjusting screw, and the present invention provides a chassis and a seat back support which are pivoted together by two shafts. And a corresponding torsion spring is arranged on both sides of the shaft, and an elastic adjusting arm is disposed on the middle shaft thereof, and the front and rear legs of the two torsion springs respectively abut against the seat back support The front end is at the rear end of the elastic adjusting arm, and the front end of the elastic adjusting arm is provided with a swinging screwing portion, and is screwed with a spring adjusting screw that is worn by the outer side of the chassis, so that the rotation of the adjusting screw is adjusted by the elastic force. The rear end of the elastic adjusting arm is placed at different angles to the rear legs of the two torsion springs, so that the front end of the seat back support is abutted by different elastic forces, thereby achieving the adjustment of the back elastic force of the chair.

The technical solution adopted by the novel to solve the technical problem is: a front side of the middle of the chassis for mounting the chair legs, and a seat back support for pivoting a rear end thereof for mounting the seat back and swinging up and down And an elastic unit for elastically reclining the seat back support between the chassis and the seat back support, wherein the chassis pivots the seat back support through a shaft provided on the inner shaft thereof The front end shaft of the seat back support is provided with an abutting rod, and the rear end thereof is provided with a seat back joint portion; the elastic unit is an elastic force adjusting arm including a middle shaft disposed at the middle of the shaft shaft, and the elastic force is The sleeves on the shafts on both sides of the adjusting arm are provided with torsion springs, and the corresponding supporting legs of the two torsion springs abut against the rear end of the elastic adjusting arm, and the front legs of the two torsion springs abut against The front end of the seat back bracket is disposed on the abutting rod, and at the same time, the front end of the elastic adjusting arm is provided with a swinging screwing portion, and the outer side corresponding to the corresponding portion of the bottom plate penetrates a screw portion of the swinging portion The elastic adjustment screw of the combination.

In the above solution, the swinging screwing portion of the front end of the elastic adjusting arm is the elastic force The front end of the adjusting arm is provided with two opposite concave arc portions, and a swinging screw block which is screwed with the elastic adjusting screw and has a convex arc portion matching the concave arc portion is disposed.

In the above solution, the elastic adjusting screw is provided with an arc-shaped abutting portion, and an arc-shaped socket which can be matched with the curved abutting portion is provided at the corresponding portion of the chassis.

In the above solution, a freely rotating sleeve is sleeved on both sides of the shaft of the pivotal chassis and the seat back support, so that the two torsion springs of the elastic unit are sleeved on the sleeve.

In the above solution, the rear end of the elastic adjusting arm traverses an abutting rod which can be abutted by the rear leg of the two torsion springs.

Therefore, the adjustment of the different angles of the elastic adjusting arm by the elastic adjusting screw provided on the elastic unit of the present invention causes the angle between the front and rear legs of the torsion spring to change, thereby allowing the backrest of the chair to be abutted. The elastic pre-stress of the seat swing is adjusted, that is, the elastic force when the seat back is lean can be adjusted to meet the individual needs.

1‧‧‧Chassis

11‧‧‧ shaft

12‧‧‧ bushings

13‧‧‧Arc-shaped socket

2‧‧‧Front back support

21‧‧‧Abutment pole

22‧‧‧Front back joint

3‧‧‧Torque spring

31‧‧‧Back foot

32‧‧‧Front feet

4‧‧‧Flexor adjustment arm

41‧‧‧Axis hole

42‧‧‧Resistance rod

43‧‧‧ concave arc

5‧‧‧ turning pendulum

51‧‧‧ convex arc

52‧‧‧ screw holes

6‧‧‧Elastic adjustment screw

61‧‧‧Arc-shaped abutment

62‧‧‧ screw

7‧‧‧Shield

A‧‧‧elastic unit

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

Figure 1 is a schematic perspective view of the present invention.

2 is a schematic exploded perspective view of the present invention.

3 is a perspective exploded view of the present invention in a bottom view.

Figure 4 is a side cross-sectional view of the present invention.

Fig. 5 is a schematic view showing the action of the elastic unit of the present invention when the seat back support is tilted back.

Fig. 6 is a schematic view showing the adjustment of the elastic unit of the present invention.

Referring to FIG. 1 to FIG. 3, the elastic unit A of the chair backrest leaning against the elastic adjusting device is accommodated in a chassis 1 for mounting the legs, and the middle of the chassis 1 is slightly forward. Both sides of the shaft are pivoted by a shaft 11 and can be swung by a backrest. 2, at the same time, the front end shaft of the seat back support 2 is provided with an abutting rod 21, and the abutting rod 21 can be accommodated in the notch provided on the front side of the chassis 1 (not shown), and in the seat back support The rear end of the seat 2 is provided with a seat back joint portion 22 for the seat back, and the outer side of the seat back support 2 is covered with a shield 7 for preventing the user from gripping the hand.

The above-mentioned elastic unit A is a shaft hole 41 shaft including a middle of an elastic force adjusting arm 4. It is disposed at the middle of the shaft 11 and can be pivoted, and the front end of the elastic adjusting arm 4 is provided with two opposite concave arc portions 43, and a bottom surface thereof is opposite to the convex arc portion 51, and a screw is arranged in the middle. The turning screw 5 of the hole 52 is seated on the concave arc portion 43, so that the turning nut 5 can swing freely on the concave arc portion 43, that is, the front end of the elastic adjusting arm 4 forms a turning screw portion. (Unmarked number), a rear end of the elastic adjusting arm 4 is disposed with a resisting lever 42.

Furthermore, on the sleeve 12 which is sleeved on the shafts 11 of the elastic adjusting arms 4 Two opposite torsion springs 3 are disposed, and the opposite leg 31 of the two torsion springs 3 abut against the abutting rod 42 provided at the rear end of the elastic adjusting arm 4, and the opposite legs of the two torsion springs 3 are opposite. 32 is abutted against the abutment rod 21 provided at the front end of the seat back support 2.

Further, a screw 62 with a rotary adjusting screw 6 of the rotary knob is provided at the end of the screw 62 The chassis 1 is screwed into the swinging screw 5 of the swinging screwing portion of the front end of the elastic adjusting arm 4, and the elastic adjusting screw 6 is provided with an arc-shaped abutting portion 61, and the corresponding portion of the chassis 1 is provided. An arcuate socket 13 engageable with the arcuate abutment 61, thereby enabling the spring adjustment screw 6 to pivot at the arcuate socket 13.

Therefore, please refer to FIG. 4 and FIG. 5, and the elastic force adjusting screw 6 pulls the elastic force. When the front end of the arm 4 is adjusted, the rear end of the elastic adjusting arm 4 generates a pre-stress against the rear leg 31 of the torsion spring 3, and the front leg 32 of the torsion spring 3 is elastically biased against the back of the chair. The front end of the seat 2 abuts against the rod 21, so when the seat back support 2 swings upside down with the back of the chair, the front end of the seat back support 2 will swing upward, but at the same time it will be subjected to the front support of the torsion spring 3 The foot 32 is elastically resisted, allowing the occupant leaning against the back of the chair to feel a relaxed and comfortable elastic leaning.

However, if the occupant flexes elastically against the back of the chair, it does not meet the individual's personal strength. When the demand is required, as shown in FIG. 6, the front end of the elastic force adjusting arm 4 is swung downward by the clockwise rotation of the elastic adjusting screw 6, and the rear end of the elastic adjusting arm 4 is swung upward to force the torsion spring. The angle between the rear leg 31 and the front leg 32 of the 3 is reduced, thereby causing the front leg 32 to exert a greater elastic preload on the abutting rod 21 at the front end of the seat back support 2, that is, tilting the seat back The swinging spring is strengthened; on the contrary, when the spring adjusting screw 6 rotates counterclockwise, the angle between the rear leg 31 and the front leg 32 of the torsion spring 3 is increased, and the front leg 32 is opposite to the backrest The abutment rod 21 at the front end of the seat 2 produces a small elastic preload, so that the tilting and swinging force of the seat back can be weakened.

Therefore, through the torsion spring 3 provided on the elastic unit A, not only can Increase the softness of the back of the chair while relying on the adjustability of the elastic force, so that the occupants can adjust according to personal preferences, making the chair more suitable for individual needs.

Secondly, when the back of the chair is adjusted by the elastic force, the back of the chair is placed back and forth by the chair. During the movement, only the front leg 32 of the torsion spring 3 has a swinging motion, and the rest of the elastic adjusting arm 4 and the elastic adjusting screw 6 remain in a stationary state, so that the elastic adjusting screw 6 does not loose at all. This causes the reclining of the seat back to change.

1‧‧‧Chassis

11‧‧‧ shaft

12‧‧‧ bushings

13‧‧‧Arc-shaped socket

2‧‧‧Front back support

21‧‧‧Abutment pole

22‧‧‧Front back joint

3‧‧‧Torque spring

31‧‧‧Back foot

32‧‧‧Front feet

4‧‧‧Flexor adjustment arm

41‧‧‧Axis hole

42‧‧‧Resistance rod

43‧‧‧ concave arc

5‧‧‧ turning pendulum

51‧‧‧ convex arc

6‧‧‧Elastic adjustment screw

61‧‧‧Arc-shaped abutment

62‧‧‧ screw

7‧‧‧Shield

A‧‧‧elastic unit

Claims (5)

The chair back rests on the elastic adjusting device, which is a slightly front side of the middle of the chassis for mounting the chair legs, and a seat back support for pivoting a rear end thereof for mounting the seat back and swinging up and down An elastic unit for elastically reclining the seat back support is disposed between the chassis and the seat back support, wherein the chassis has a shaft through the inner shaft to pivot the chassis and the seat back support The seat back support has a front end shaft provided with an abutting rod, and a rear end is provided with a seat back joint portion; the elastic unit includes an elastic force adjusting arm with a middle shaft disposed between the shaft shafts, and the elastic adjusting arm The sleeves on the two sides of the shaft are provided with torsion springs, and the corresponding rear legs of the two torsion springs abut against the rear end of the elastic adjusting arm, and the corresponding front legs of the two torsion springs abut against The abutting rod of the front end of the seat back support is provided with a swinging screwing portion at the front end of the elastic adjusting arm, and is screwed to the outer side of the corresponding portion of the chassis to be screwed with the turning screw The elastic adjustment screw. The chair back according to claim 1 is a resilient adjusting device, wherein the swinging screwing portion of the front end of the elastic adjusting arm is provided with two opposite concave arc portions at the front end of the elastic adjusting arm, and is provided with the elastic force The turning screw is adjusted to pass through the screw and has a convex arc portion having a convex arc portion that matches the concave arc portion. The seat back according to claim 1 is disposed on the elastic adjusting device, wherein the elastic adjusting screw is provided with an arc-shaped abutting portion, and an arc-shaped bearing conforming to the curved abutting portion is disposed at a corresponding portion of the chassis. nest. The back of the chair according to claim 1 is placed on the elastic adjusting device, wherein a freely rotating sleeve is sleeved on both sides of the shaft of the chassis and the seat back support, and the two torsion spring sleeves of the elastic unit are arranged. Set on the sleeve. The seat back according to claim 1 leans against the elastic adjusting device, wherein the rear end of the elastic adjusting arm traverses an abutting rod which can abut against the rear leg of the two torsion springs.