JPH0132906Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an improvement of a lifting device for a height-adjustable chair in which the height of the seat can be adjusted.

<Prior Art> In general, a chair for a piano or an electronic musical instrument has a seat mounting frame 1 supporting a seat A and a leg mounting frame 2 fixed to legs B disposed one above the other as shown in FIGS. A pair of left and right working rods 4, 4 are disposed between both frames 1, 2, intersectingly and rotatably connected by a shaft 3. Then, the right ends 4a, 4b of the working rods 4, 4 are inserted into the long holes 6a, 6b provided horizontally on the right side of the upper and lower frames 1, 2 in the left-right direction.
a, 5b, and are slidably engaged. The left end portions 4c, 4d are rotatably connected to the left end portions of the upper and lower frames 1, 2 by pins 5c, 5d. A screw 8 extending in the left and right direction is rotatably attached to the lower part of the seat mounting frame 1 by means of support fittings 7, 7, the right end of the screw 8 extends outward, a handle 9 is attached here, and one The lower part of the engagement plate 10 attached to the upper right end 4a of the working rod 4 is screwed onto the screw 8, and the working rod 4 is engaged with the screw 8.

To adjust the height of the seat A, the screw 8 is rotated in forward and reverse directions using the handle 9 to move the engagement plate 10 left and right. When the engagement plate 10 is moved to the left, the pins 5a and 5b at the right end of the working rods 4 and 4
moves to the left, the distances between the left and right pins 5a and 5c, 5b and 5d become narrower, and the working rods 4, 4 rise. This causes the seat attachment frame 1 to rise, and the seat A to rise.

On the other hand, when the handle 9 is reversed and the engagement plate 10 is moved to the right, the working rods 4, 4 are expanded in the left-right direction, the seat mounting frame 1 is lowered, and the seat A is lowered.

<Problems and Means to be Solved> Although the seat A is raised and lowered in this manner, the conventional device described above does not have a height display section that objectively indicates the height of the seat A. Therefore, if you carelessly sit down after someone else has changed the height without permission, the seat height will not be optimal and you will have to adjust the height again.

The present invention aims to eliminate the above-mentioned drawbacks through simple improvements and provide a chair with a height display section that allows the user to objectively know the height of the seat.

<Embodiments> Examples of the present invention will be described below with reference to FIGS. 1 and 2. Two long sides 11a and two short sides 11b are connected by four connecting fittings 12,
A rectangular lower frame 11 is formed and fixed to the upper part of the leg B. The upper frame body 13 that fixes the seat A,
It is formed by connecting two long angle members 13a and one short angle member 13b in a U-shape. Both angle members 13a and 13b have an L-shaped cross section, and the upper surface thereof serves as a mounting portion 13c for the seat A. Upper and lower frame bodies 11,1
A lifting device 14 for adjusting the height of the seat A is provided between the seats A and 3. The lifting device 14 includes a pair of link levers 1
5a and 15b are crossed at their longitudinal centers and are rotatably connected to each other, and this link lever 15 is connected to the upper and lower frames
1 and 13 (front side and back side in FIG. 1) to support the upper frame body 13. Front link/
The lever 15 and the rear link lever 15 have the same configuration, and only one side will be described below.

The link levers 15a, 15b are connected to the intersection 16
They are rotatably connected by a pin 16a. Mounting fittings 17, 17 are attached to the inner sides of the long side members 11a, 11a of the lower frame 11, and the right end of the link lever 15a is rotatably attached to the right end of the mounting fitting 17 with a pin 18. Other link lever 1
The right end of 5b is the long angle member 13 of the upper frame 13.
Rotatably attach it to the right end of a with a pin 18.
The left ends of the link levers 15a and 15b are horizontally connected to the left end of the long angle member 13a of the upper frame 13 and the left end of the mounting bracket 17 attached to the long side member 11a of the lower frame 11, respectively. Opened long groove 1
9a, 19b by sliding pieces 20a, 20b so as to be slidable in the left-right direction. Link lever 1
5a, that is, the sliding piece 20a engaged with the long groove 19a of the long angle member 13a of the upper frame 13 has a connecting rod 21 that connects the link lever 15 on the front side and the link lever 15 on the back side. Connect. Also, pins 16a, 1 at intersections 16, 16
6a with rod 22, and between both left and right ends with rod 2
Connect with 3,23. In this way, a total of four rods connect the link lever 15 on the front side and the link lever 15 on the back side, so that the two can move as one.

An upwardly rising pointing rod 24 is attached to the left end of the link lever 15b, that is, the sliding piece 20b engaged with the long groove 19b of the mounting bracket 17 of the lower frame 11, and the pointing rod 24 is connected to the pointing portion 24a at the upper end of the pointing rod 24. A scale plate 25 is provided on the upper surface of the long side material 11a. The scale plate 25 is provided with a scale so that the position indicated by the indicator 24a is the height of the seat A at that time.

A handle screw shaft 26 extending in the left-right direction is provided at the center of the upper frame 13 in the front-rear direction, its left and right ends protrude outward, and handles 26a are attached to both ends. This handle screw shaft 26 is connected to the long angle member 13.
The right end is supported by a support piece 26b that stands up on the lower surface of the seat A. A pair of operating screw shafts 27, 27 are provided on both sides of the handle screw shaft 26, that is, on the front and back, and the left ends of both operating screw shafts 27, 27 are attached to the short angle member 13b of the upper frame 13 by bearings 28, and the right side is connected. Screw into rod 21. The operation screw shafts 27, 27 each have a sprocket gear 3.
Attach 0, 30 and use chains 31, 31.
Sprocket gear 32, 3 of handle screw shaft 26
2, so that both operating screw shafts 27, 27 are linked with the handle screw shaft 26 and rotated at the same time.

As a result, when the handle screw shaft 26 is rotated, the operation screw shafts 27, 27 are rotated, and the rotation of the handle screw shaft 27 causes the connecting rod 21 to move forward and backward (move left and right in FIGS. 1 and 2). When the connecting rod 21 moves in the direction of the arrow A, the distance between the two ends of the link levers 15, 15 becomes narrower, and the link levers 15, 15 gradually stand up, raising the upper frame 13 and the seat A. When the handle screw shaft 24 is turned in the opposite direction, the connecting bar 21 retreats in the direction of arrow A, and the two ends are widened, and the upper frame 1
3. Locus A descends.

<Effects of the invention> As explained above, the present invention has an indicator rod attached to either the upper or lower sliding end of the link lever of the lifting device, and a scale indicating the seat height corresponding to the indicator rod. Since a scale plate is provided, the height of the seat can be determined objectively by looking at the scale plate. Therefore, the height of the seat can be quickly adjusted to the optimum height for each performer.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing the elevating device of the present invention, Fig. 2 is a cross-sectional view taken from Fig. 1, and Fig. 3 is a side view showing a height-adjustable chair to which the elevating device of the present invention is applied. FIG. 4 is a longitudinal sectional view showing a conventional lifting device. 11... lower frame body, 13... upper frame body, 14...
... Lifting device, 15 ... Link lever, 24 ...
Indicator stick, 25...scale plate.

Claims (1)

[Scope of utility model registration request] An upper frame body that fixes the seat and a lower frame body that fixes the upper part of the legs are arranged vertically, and between the two frames, a pair of links are connected to each other so as to be rotatable, intersecting each other at the center in the longitudinal direction.・A lever is provided, and one end and the other end of this link lever are spaced horizontally from each other,
In the height-adjustable chair lifting device, the upper and lower ends of one end are rotatably connected to the frame, and the upper and lower ends of the other end are horizontally slidably connected to the frame. A height-adjustable chair lifting device comprising a height indicator rod attached to either the upper or lower sliding end of the chair, and a scale plate provided with a scale indicating the height of the seat corresponding to the height indicator rod.