JP2572827Y2 - Built-in structure of operation lever in chair lifting device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembling structure of an operating lever for operating a gas spring in a chair elevating device for raising and lowering a seat by a gas spring.

[0002]

2. Description of the Related Art In recent years, many chair lifting and lowering devices using gas springs have been used. However, a built-in structure of a lever for operating a gas spring is not always sufficient in terms of assembling efficiency. There were difficulties such as breaking the gas spring due to excessive pressurization.

[0003]

SUMMARY OF THE INVENTION The object of the present invention is to provide an assembling structure of an operating lever in an elevating device in which the operating lever can be easily assembled and excessive pressurization of a spring pin by the operating lever is eliminated. It is intended.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, a seat receiving pipe 3 having a downward opening for supporting a seat is fixedly mounted on a gas spring 2 incorporated in a pillar 1. Then, the operation lever 5 is inserted into the through hole 4 formed in the side surface of the seat receiving pipe 3 so that the insertion portion of the operation lever 5 faces the spring pin 2 a of the gas spring 2. The spring pin 2a is engaged with an engagement hole 6 formed below the distal end portion, and the tip of a stopper screw 8 screwed into the seat pipe 3 is protruded into the seat pipe 3. Notch 7 formed at the tip of
The upper wall 7a of the notch 7 is engaged with the tip of the stopper screw 8 through the notch.

[0005]

According to the present invention, when the operating lever 5 is pulled upward, the spring pin 2a is pressurized, the gas spring 2 is actuated, and the seat is raised and lowered. The pressurization of the spring pin 2a by the operation lever 5 is stopped when the upper wall 7a of the part 7 is engaged with the tip of the stopper screw 8. That is, the pressing of the operating lever 5 against the spring pin 2a is performed until the upper wall 7a of the notch 7 comes into contact with the stopper screw 8,
It is regulated so that excessive pressurization is avoided as in the case of the conventional product and that the pressurization is performed within a certain width.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an embodiment of the present invention; FIG. Then, the front end of the pipe-shaped operating lever 5 is fitted and fixed on the upper part of the gas spring 2 through a through hole 4 formed in one side surface (the front surface at the seat position) of the seat pipe 3. The spring pin 2a is engaged with an engagement hole 6 formed in the lower surface of the distal end of the operation lever 5 while being inserted into the operation lever 3, and a notch 7 is cut off at the distal end of the operation lever 5. Reference numeral 8 denotes a stopper screw screwed into the pipe from the back of the seat receiving pipe 3 so that its tip protrudes into the pipe. When the operation lever 5 is operated, the upper wall of the notch 7 engages with the stopper screw 8, It is designed to avoid excessive pressurization of the spring pin 2a by the operation lever 5.

[0007]

As described above, according to the present invention, a seat pipe 3 having a downward opening for supporting a seat is fitted and fixed on an upper part of a gas spring 2 incorporated in a pillar 1. An operating lever 5 is inserted through a through hole 4 formed in a side surface of the gas spring 2 so that an inserted portion of the operating lever 5 faces a spring pin 2 a of the gas spring 2. The notch 7 formed at the tip of the operating lever 5 is formed by engaging the spring pin 2a with the mating hole 6 and projecting the tip of the stopper screw 8 screwed into the seat pipe 3 into the seat pipe 3. The upper wall 7a of the notch 7 provided at the tip of the operating lever 5 is related to a configuration in which the upper wall 7a of the notch 7
a is engaged with the stopper screw 8 and the spring pin 2a
To avoid excessive pressurization of the operating lever 5 with respect to the gas spring 2, thereby avoiding failure and breakage of the gas spring 2.
It is considered that the function of the gas spring 2 can be sufficiently exhibited, and a comfortable chair elevating function can be expected, and the spring pin 2a is engaged with the engaging hole 6 of the operation lever 5 inserted from the through hole 4, It is only necessary to screw in the screw 8 for the stopper, and there are advantages that the mounting of the operation lever is very simple.

[Brief description of the drawings]

FIG. 1 is a side view of a chair embodying the present invention.

FIG. 2 is a sectional view of a main part.

FIG. 3 is an exploded perspective view of a main part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pillar 2 Gas spring 3 Seat pipe 4 Through hole 5 Operation lever 6 Engagement hole 7 Notch 8 Screw for stopper

Claims (1)

(57) [Scope of request for utility model registration] A seat pipe having a downward opening for supporting a seat is fixedly fitted on an upper part of a gas spring incorporated in a pillar, and a through hole formed in a side surface of the seat pipe. 4, the operating lever 5 is inserted through the spring pin 2 a of the gas spring 2 so that the inserted portion of the operating lever 5 faces the spring pin 2 a. 2a is engaged, and the tip of the stopper screw 8 screwed into the seat pipe 5 is projected into the seat pipe 3, so that a notch 7 formed at the tip of the operation lever 5 is formed.
The upper wall 7a of the cutout 7 is locked to the tip of the stopper screw 8 via the control lever.