JPH0114216Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present application relates to a chair that has a simple structure and allows the seat to be easily raised and lowered.Examples thereof will be described in detail below with reference to the drawings. The embodiment shows the structure of a chair in which armrests are integrally provided on the leg frame and a backrest is integrally provided on the seat. 1 is made of one metal oval pipe, and this oval pipe is connected to the middle part of the chair. Bend it in a forward U-shape and connect the ground contact part 1.
a, and each of the front ends thereof is bent and extended upward so as to be inclined slightly backward to form a supporting portion 1b,
1b' is erected, and each upper end thereof is bent and extended rearward to integrally form elbow rests 1c, 1c'. A plurality of engagement holes 1d along the horizontal direction
is installed. 2, 2' are the supporting parts 1b,
A holding part 2a that is a sliding member that is slidably inserted into 1b' and that slidably holds the supporting parts 1b and 1b'.
and a pair of parallel mounting pieces 2c extending rearward from the rear end of the holding portion 2a and having a pivot hole 2b, and the sliding members 2, 2' are attached to the connecting rod 3. They are connected together. Reference numerals 4 and 4' denote rotation adjustment plates respectively attached to both sides of the front lower surface of the seat part 6 which is integrally provided with the backrest 5, and the front edge thereof is preferably inclined so as to contact the rear surface of the support part of the leg frame 1. An engaging protrusion 4a that selectively engages with one of the engaging holes 1d is provided at the lower part of the front edge, and a pivot portion 4a that matches the pivot hole 2b of the sliding member is provided at the upper part of the leading edge. Hole 4
Furthermore, mounting ribs 4c are integrally provided on the upper edges of the mounting ribs 4c that protrude inward and attach the lower surface of the seat portion 6, and the pair of rotation adjusting plates 4, 4' are connected to the sliding members 2, 2. A pair of parallel mounting pieces 2c provided at
2c, and then the pivot shaft 7 is inserted through the pivot holes 2b and 4b to be rotatably attached. The pair of rotation adjusting plates 4, 4' are integrally connected by fixing both ends of a horizontal rod 8 supporting the lower surface of the seat 6 to the mounting rib 4c. In the figure, 9 is a reinforcing board for the seat 6, and 10 is a sliding member 2, 2'.
It is a stopper.

Therefore, the engagement protrusions 4a provided on the rotation adjustment plates 4, 4' are normally connected to the left and right support portions 1b, 1b of the leg frame 1,
1b', and the front edges of the rotation adjustment plates 4, 4' are in contact with the rear surface of the support part of the leg frame 1, and the seat part 6 is attached to the leg frame 1. On the other hand, it is held almost horizontally. When trying to change the height position of the seat 6 from this state,
In FIG. 2, the seat 6 is rotated slightly counterclockwise. Then, the rotation adjusting plates 4, 4' rotate with respect to the sliding members 2, 2' using the pivot 7 as a support point, and the engagement protrusion 4a of the rotation adjusting plates 4, 4' separates from the engagement hole 1d. When the seat part 6 is moved up and down in this state, the sliding members 2 and 2' move up and down while being guided by the support parts 1b and 1b' of the leg frame 1, and the engagement protrusion 4a moves up and down while being guided by the support parts 1b and 1b' of the leg frame 1. The seat part 6 is engaged with the engagement hole 1d, and in this state, the seat part 6 stops moving up and down, and in this way, the engagement hole 1d
The height of the seat portion 6 can be changed by selecting the engagement protrusion 4a relative to the seat portion 6.

Since the present application is constructed as described above, it is easy to obtain a mechanism for lifting and lowering the seat relative to the leg frame made of metal pipes, and the lifting and lowering operations can be easily performed, making it convenient to handle. In addition, since only the front part of the seat was supported by the support part of the leg frame, a locking function was created in the seat.
It is very comfortable to sit on, and since the rotation adjustment plate is attached to the underside of the seat, the rotation adjustment plate is hidden by the seat, giving it a good appearance, and it does not touch the seat when in use. It has the advantage that the engagement state between the engagement protrusion and the engagement hole is guaranteed by the load, allowing safe use.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, in which Fig. 1 is a perspective view of the whole, Fig. 2 is an enlarged side view of the whole with a part cut away, and Fig. 3 shows a state in which a pair of sliding members are connected. FIG. 4 is a perspective view of a state in which a pair of rotation adjustment plates are connected. In the figure, 1 is the leg frame, 1b, 1b' are the support parts, 1
c is an engagement hole, 2 and 2' are sliding members, 2a is a holding part,
2c is a mounting piece, 3 is a connecting rod, 4 is a rotation adjustment plate, 4
a is an engaging protrusion, 6 is a seat, 7 is a pivot, and 8 is a horizontal rod.

Claims (1)

[Claims for Utility Model Registration] (1) A horizontal ground-contacting portion bent in a forward U-shape has a pair of linearly extending support portions at each front end thereof, and a pair of support portions extending in a straight line on the rear surface along the length direction. A pair of left and right sliding members connected by a connecting rod are slidably fitted into the supporting portion of the leg frame made of a metal pipe provided with a plurality of engagement holes, respectively,
The upper part of a rotation adjustment plate having an engagement protrusion selectively engaged with one of the engagement holes at the lower part of the front edge is pivotally attached to the rear part of each of the sliding members. A chair with a rotation adjustment plate attached to the underside of the seat. (2) Utility model registration claim 1, which is configured such that the front edge of the rotation adjustment plate comes into contact with the rear surface of the support part of the leg frame when the engagement protrusion is engaged with the engagement hole.
The chair mentioned in the section.