JPH0414036Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention utilizes the gas pressure of a gas spring to interlock the seat and backrest of a chair to comfortably tilt them, and to adjust the angle of the backrest relative to the seat. This invention relates to a device that can be finely adjusted as desired.

[Conventional technology]

A device for comfortably tilting the seat and backrest of a chair using the gas pressure of a gas spring is described, for example, in Japanese Utility Model Application Publication No. 72646/1983.

This device has gas springs installed between the base frame installed at the top of the pedestal and the seat mounting frame, and between the base frame and the backrest support rod. The inclination angle of the seat and backrest can be adjusted by driving a spring extension plug.

In addition, as described in Japanese Utility Model Application No. 60-117742, a single gas spring is used to interlock the seat and backrest depending on the time of work and rest.
Some devices are designed to tilt at an optimal angle.

[Problem that the invention attempts to solve]

The former device uses two gas springs, which makes it expensive, and because both gas springs cause the seat and backrest to tilt independently and do not work together, the balance between the tilt angles of the two becomes unbalanced. This tends to make sitting uncomfortable, and a large space is required under the seat to accommodate both gas springs, which imposes significant restrictions on the design of the chair.

In addition, with the latter device, the seat and backrest always tilt in conjunction with each other, and when the gas spring is locked, both tilt at a fixed angle, so only the backrest can be tilted according to the preference of the seated person. I can't.

[Means for solving the problem] The present invention is to attach the front part of the seat mounting frame and the front end of the gas spring facing in the front-rear direction to the front part of the base frame fixed to the upper end of the chair pillar. At the same time, a lever for extending and retracting the gas spring is provided, and the rear upper end of the seat mounting frame and the rear upper end of the link facing downward and forward are connected to the front upper end of the backrest support rod.
A longitudinally long long shaft is provided at the rear of the base frame, and both ends of the engagement shaft, which pivots with a stop shaft facing the side and pivots the rear end of the gas spring and the front lower end of the link, are attached to the rear end of the base frame. The telescopic end of the rear end of the telescopic rod, which faces in the front-rear direction and is fitted into a pair of left and right elongated holes and is fixed on the engagement shaft so as not to move back and forth, is pivoted to the front lower end of the backrest support rod using a support shaft. By doing so, the above-mentioned problems are solved.

[Effect]

By operating the gas spring expansion/contraction lever and expanding/contracting the gas spring, the engagement shaft moves within the long hole, causing the seat and backrest to interlock and tilt to the desired angle, allowing the gas spring to move comfortably. You can enjoy the repulsive force.

By expanding and contracting the telescopic rod, the angle of the backrest relative to the seat can be finely adjusted to suit your body physique and preferences.

〔Example〕

As shown in the attached drawing, the upper end of the pedestal 1 includes:
The front part of the horizontal base frame 2 is fixed, and the front part of the mounting frame 4 of the seat 3 and the front end of the gas spring 5 facing in the front-rear direction are attached to the front end of the base frame 2 by means of a pivot 6 facing laterally. It is pivotally supported.

A lever 7 for extending and retracting the gas spring 5 is pivotally installed at the front end of the base frame 2, and the lever 7 is connected to a handle (not shown) provided on the underside of the seat 3 by means of a wire 8.
is linked to.

At the rear end of the mounting frame 4, the front upper end of a support rod 10 that curves toward the front is pivotally supported by a support shaft 11, and on the support shaft 11, a pair of left and right links 12 that face downward and forward are pivoted. It is worn.

The front lower ends of both links 12 and the rear end of the gas spring 5 are pivotally connected to an engaging shaft 13 facing sideways, and both ends of the engaging shaft 13 are connected to the base frame 2 and the support frame 14 whose entire surface is U-shaped. It is engaged in longitudinally elongated holes 15 and 16 formed in the left side pieces 2a and 14a so as to be movable back and forth.

Reference numeral 17 denotes a telescopic rod in which a male threaded rod 19 is screwed into the rear part of a female threaded tube 18 facing in the front-rear direction, and the front portion of the male threaded rod 19 is pivoted to the center of the above-mentioned engagement shaft 13 so as not to be movable back and forth. has been done.

The front end of the female threaded cylinder 18 is connected to a handle 21 pivotally provided on the side surface of the mounting frame 4 through a flexible tube 20, and the rear end of the male threaded rod 19 is connected to the front lower end of the backrest support frame 10 through a support shaft 22. supported.

In the above device, when the gas spring 5 is expanded or contracted by operating a handle (not shown), the engagement shaft 13 moves back and forth along the elongated holes 15 and 16, and the front lower end of the link 12 tilts forward and downward. Since both the substantially horizontal telescoping rods 17 move back and forth, the seat 3 and the backrest 9 tilt in conjunction with each other.

In addition, by operating the handle 21, the telescopic rod 17
When the female threaded cylinder 18 is rotated, the male threaded rod 19 moves back and forth, and only the backrest 9 tilts back and forth.

[Effect of idea]

With the device of this invention, the angle of the backrest relative to the seat can be arbitrarily adjusted with a simple operation, and the two can be tilted in conjunction with each other, so many people with different physiques and tastes can use the chair satisfactorily. It is convenient because it can be done.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional side view of a main part of a chair to which the present invention is applied, FIG. 2 is an enlarged plan view of the device of the present invention with the seat removed, and FIG. 3 is a perspective view of the same. 1... Pillar, 2... Base frame, 3... Seat, 4...
Mounting frame, 5...Gas spring, 6...Pivot, 7
...Lever, 8...Wire, 9...Backrest, 1
0... Support rod, 11... Support shaft, 12... Link,
13... Engagement shaft, 14... Support frame, 15, 16...
...Long hole, 17...Telescopic rod, 18...Femally threaded tube, 1
9... Male screw rod, 20... Flexible tube, 21... Handle, 22... Support shaft.

Claims (1)

[Scope of utility model registration request] The front part of the seat mounting frame and the front end of the gas spring facing in the front-rear direction are pivoted to the front part of the base frame fixed to the upper end of the chair's leg column with a pivot pointing to the side. Equipped with a lever for expansion and contraction,
The rear upper end of the seat mounting frame and the rear upper end of the link facing downward and forward are pivoted to the front upper end of the backrest support rod with a stop shaft facing sideways, and the rear end of the gas spring and the rear upper end of the link Both ends of the engagement shaft that pivots the lower front end are fitted into a pair of elongated left and right holes provided at the rear of the base frame. A tilting device for a seat and a backrest of a chair, in which a retractable end of a rear end of an extensible rod is pivoted to a lower front end of a backrest support rod using a support shaft.