JPH0553544U - Control device for gas spring in chair - Google Patents

Abstract

(57) [Abstract] [Purpose] When the actuator for pressing the push rod of the gas spring in a chair is made of synthetic resin, the operation of the gas spring may become incomplete due to wear of the actuator. Make sure to prevent. A metal contact piece 20 is provided on a portion 14a of the actuation body 14 that directly abuts the push rod 13 or a portion 14a that abuts the pressing body 23 on the push rod 13.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an improvement of a gas spring for adjusting a back tilt angle of a backrest of a chair or an operating device of the gas spring for adjusting a height of a seat body.

[0002]

[Prior Art]

 As a gas spring operating device for adjusting the back tilting angle of a backrest in a chair, Japanese Utility Model Laid-Open No. 3-64533 discloses that a left and right long support shaft is mounted on the front portion of a seat receiving member in the chair. A bracket having a U-shape in plan view is fitted on the support shaft, the front end of the gas spring is fixed to the bracket, and the pressing body of the gas spring against the push rod is rotatably supported. , A synthetic resin actuating member formed in a cam shape so that the pushing member can be turned can be fitted on the support shaft, and the actuating member is turned and pushed by lever operation from the outside of the chair. A device has been described in which the push rod of the gas spring is pressed through the body.

[0003]

[Problems to be solved by the device]

 In this way, when the actuating body is made of synthetic resin, it can be easily manufactured even if the actuating body has a complicated shape, and since the synthetic resin does not rust, the actuating body can be easily rotated. This has the advantage that the movement can be performed smoothly. However, on the other hand, synthetic resin is more likely to wear than metal, so during repeated operation of the gas spring, the part of the actuating element that comes into contact with the pressing body becomes worn, and the pressing body However, there is a problem in that the pushing operation of the push rod cannot be reliably performed because the rotation of the push button is not complete.

The present invention aims to solve this problem.

[0005]

Means for Solving the Problems To achieve this object, the present invention provides a seat receiving member of a chair, a gas spring for adjusting a back tilt angle of a backrest, or a push rod in a gas spring for adjusting a height of a seat. Of the gas spring is provided so that the push rod of the gas spring can directly or indirectly press the push rod of the gas spring by an operation from the outside of the chair. A metal contact piece is provided on the surface portion contacting the push rod or the pressing body.

[0006]

[Operation and effect of the device]

 In this way, when the metal contact piece is attached to the portion of the actuating body that comes into contact with the push rod or the pressing body, the push rod can be directly pressed by the rotation of the actuating body, or the operating body can be rotated. Even if the pressing body is repeatedly rotated by rotating, the contact piece hardly wears.Therefore, push the gas spring push rod to expand and contract the gas spring. It can be done reliably.

[0007] Furthermore, the contact piece is only provided at a portion contacting the push rod or the pressing body of the gas spring, and the other portions are made of synthetic resin. Therefore, the operating body is made of synthetic resin. It does not impair the advantages of forming by, that is, the advantages such as ease of manufacturing and smooth operation. Therefore, according to the present invention, there is an effect that the gas spring can be reliably operated for a long period of time without impairing the easiness of manufacturing the actuator and the smooth operation.

[0008]

【Example】

 Next, an embodiment in which the present invention is applied to a gas spring for adjusting the back tilt angle of a backrest will be described with reference to the drawings. 1 to 7 show the first embodiment. In these drawings, reference numeral 1 is a leg body having a gas spring (not shown) built in, and reference numeral 2 is an upward direction fixed to the upper end of the leg body 1. Each of the open seat receiving members is shown, and a seat plate 4 provided with a cushion body 3 is fixed to a flange 2b formed at the upper ends of the left and right side plates 2a of the seat receiving member 2.

Further, at the rear portion of the left and right side plates 2a, 2a of the seat receiving member 2, a front and rear midway portion of a backrest support rod 5 formed in a U-shaped cross section is rotatably supported by a horizontal pivot pin 6. On the other hand, the gas spring 7 is arranged inside the seat receiving member 2 in a tilted posture, and the rear end of the gas spring 7 and the front ends of the left and right side plates 5a of the backrest support rod 5 are horizontally arranged. Is rotatably pivoted by a pin 8, and a horizontal support shaft 9 is mounted between the front ends of the left and right side plates 2a, 2a of the seat receiving member 2, and the support shaft 9 is flat. A bracket 10 having a U-shape in plan view is rotatably fitted, the tip of the piston rod 11 of the gas spring 7 is fixed to the bracket 10 with a nut 12, and the push rod 13 is directed toward the spindle 9. Exposed.

An actuating body 14 formed of a synthetic resin in a cylindrical shape is rotatably fitted on the support shaft 9, and one end of the actuating body 14 projects laterally from the seat receiving member 2. A small-diameter shaft portion 14a having a non-circular cross section is formed at this one end, and the proximal end portion 15a of the operation lever 15 formed in a substantially L-shape is non-rotatably fitted to the small-diameter shaft portion 14a so that the operation lever 15 is rotated. The operating body 14 can be rotated by a dynamic operation.

A hole 16 is formed in the seat receiving member 2 so that the actuating body 14 can be inserted and removed from the front, and a bearing portion 17 for the spindle 9 is provided on the side plate 2a so as to project forward. On the other hand, by forming a first cutout groove 18 into which the side plate 10a of the bracket 10 fits and a second cutout groove 19 into which the bearing portion 17 of the seat receiving member 2 fits, in the actuating body 14. The bracket 10 and the actuating body 14 are configured to be independently rotatable with respect to the support shaft 9.

A portion of the actuating body 14 sandwiched by the left and right side plates 10a, 10a of the bracket 10 is formed into a cam portion 14b having a flat portion for the push rod 13, and the flat portion of the cam portion 14b is formed. A contact piece 20 made of a metal plate is integrally embedded in the portion. The contact piece 20 may be stretched with an adhesive or the like after the actuation body 14 is formed. Reference numerals 21 and 22 in FIG. 3 indicate colors, respectively. A push rod 13 'is also provided at the upper end of the leg 1 so as to switch the gas spring built in the leg 1 between a locked state and an unlocked state.

In the above structure, when the operation lever 15 is rotated in the direction of arrow A, the operating body 14 is also integrally rotated in the same direction, and the cam portion 14b of the operating body 14 causes the push rod 13 of the gas spring 7 to move. Since the gas spring 7 is pressed, the lock of the gas spring 7 is released, and the piston rod 11 is projected by the internal pressure. Therefore, when the push rod 13 is held in a state of not leaning against the backrest, and when the backrest is in the desired posture, the operation lever 15 is released to release the pressure on the pushrod 13, thereby releasing the backrest. Can be changed to the forward tilt direction, and conversely, while the push rod 13 is being pressed by the actuating body 14, the person sitting in the chair leans against the backrest and the internal pressure of the gas spring 7 is reduced. By retreating the piston rod 11 against this, the posture of the backrest can be changed to the direction in which the backrest tilts backward.

Even when the operation of the gas spring 7 as described above is repeated over a long period of time, since the contact piece 20 is made of a metal plate, the contact piece 20 hardly wears. It is possible to reliably prevent the situation where the push rod 13 is insufficiently pushed and the gas spring 7 becomes inoperable. In the second embodiment shown in FIGS. 8 to 9, instead of directly pressing the push rod 13 with the actuating body 14, the left and right side plates 10a, 10a of the bracket 10 are formed into a V shape in a side view. An upper end of the bent pressing body 23 is pivotally attached by a pin 24 so as to be rotatable back and forth, the pressing body 23 is rotated by the actuating body 14, and the push rod 13 is pressed by the pressing body 23. is there.

In the third embodiment shown in FIG. 10, the operating body 14 is arranged between the support shaft 9 and the push rod 13, and the upper end of the operating body 14 is connected to the left and right side plates 2 a of the seat receiving member 2. The operation rod 25 is rotatably supported by the rotation shaft 2a and fixed to the operation shaft 25 so as not to be rotatable. The operation lever 15 is attached to the end of the operation shaft 25, and the push rod 13 is directly pressed by the actuating body 14. In such a case, the contact piece 20 made of a metal plate is embedded in the portion of the actuating body 14 that contacts the push rod 13.

In each of the above embodiments, the contact piece was embedded in the actuating body. However, the contact piece may be locked to the actuating body by utilizing its own elasticity, or fixed by a screw. Needless to say, the present invention can also be applied to a gas spring for adjusting the height of the seat body.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment.

FIG. 2 is a vertical sectional side view of a chair.

FIG. 3 is a plan view taken along line III-III of FIG.

4 is a sectional view taken along line IV-IV in FIG.

5 is a cross-sectional view taken along line VV of FIG.

6 is a sectional view taken along line VI-VI of FIG.

7 is a sectional view taken along line VII-VII in FIG.

FIG. 8 is a main part plan view showing a second embodiment.

9 is a sectional view taken along line IX-IX in FIG.

FIG. 10 is a cross-sectional view of essential parts showing a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Leg body 2 Seat receiving body 3 Seat plate 5 Backrest supporting rod 7 Gas spring 9 Support shaft 10 Bracket 11 Piston rod 13 Push rod 14 Actuator 14b Cam part 15 Operating lever 20 Contact piece 23 Pressing body

Claims (1)

[Scope of utility model registration request] 1. A seat receiving member of a chair, an operating member for a push rod of a gas spring for adjusting a back tilting angle of a backrest or a gas spring for adjusting a height of a seat is operated by an operation from the outside of the chair. A push rod of the gas spring is rotatably provided so as to be able to directly or indirectly press through a rotary pressing body, and a metal part is provided on a surface portion of the actuating body which is in contact with the push rod or the pressing body. A device for operating a gas spring in a chair, which is provided with a contact piece made of steel.