JPH0225332Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a backrest position adjustment device for a study chair used mainly in a study desk.

Conventional technology and problems Study chairs can be used comfortably over a considerable period of time, from infancy or early school years when children are still short, to middle school or high school students, depending on their physical growth. It is hoped that this will be possible.

For this reason, study chairs whose seat height can be variably adjusted have been extremely common. However, in order to make it ergonomic and usable according to the body shape, it is necessary to adjust not only the height of the seat but also the effective depth of the seat and the height of the backrest. It is desirable that it be able to be freely adjusted.

In response to such demands, a chair in which the mounting position of the backrest can be adjusted in the front and back direction with respect to the seat is known, for example, as seen in Japanese Utility Model Publication No. 53-21285. However, this type of conventional backrest position adjustment device is approximately L when viewed from the side.
The horizontal rod part of the backrest support rod forming a letter shape is held on the lower surface side of the seat part so as to be slidable in the front and rear direction,
This can be fixed at any position using a stopper mechanism or a locking mechanism, but generally the manufacturing cost is high due to the complexity of the structure, and there are concerns about the strength after adjustment, and it is difficult for schoolchildren etc. It is unsuitable for use as a backrest adjustment device for study chairs due to the high risk of failure due to rough handling. Although there is a strong desire to do so, the current situation is that it is difficult to apply such methods to wooden chairs, and as a result, study chairs have not yet been put into practical use.

Based on the above-mentioned background, this invention is structurally simple, does not require high production costs, can be easily adjusted even by children or women, and has excellent strength and robustness. The object of the present invention is to provide a chair backrest position adjustment device that can simultaneously satisfy various requirements, such as being able to be applied without any problem even when the upper structure including the seat is made of wood. do.

Means for Solving the Problems For the above purpose, this invention has a backrest that is height-adjustably mounted between the rising portions of a pair of left and right connecting frames formed approximately in an L-shape, and a backrest that is height-adjustable. A long hole or groove long in the front-rear direction and a bolt insertion hole are provided in the horizontal part of the frame at the front position and the rear end position, respectively, and
A sliding guide pin that is loosely fitted into the elongated hole or groove, and a plurality of screw holes, any one of which is selectively matched with the bolt insertion hole, are provided on both sides of the seat. The gist of the present invention is a chair backrest position adjusting device, which is equipped with a fixing bolt that is screwed into any one of the bolts through the bolt insertion hole and fixes the connecting frame.

Embodiment Figures 1 and 2 show an embodiment of this invention. Reference numeral 1 denotes a leg column, which is provided with a plurality of leg seat parts 2 extending radially at the lower end, and is connected to the upper end through seat fittings. A seat portion 3 is placed and fixed. This seat portion 3 is constructed by attaching a cushion material 7 to the upper surface of a wooden seat frame 4, and further covering the entire outer surface with an exterior material such as cloth. Reference numeral 8 denotes a plurality of screw holes arranged at predetermined intervals in the front-rear direction in the back half of both sides of the seat part 3, and as shown in FIG. It is formed by being embedded in a fitted state. Reference numeral 10 denotes sliding guide pins protruding from positions near the front end of both sides of the seat part 3,
It was typed into.

Reference numeral 11 denotes a backrest, which is constructed by covering the outer surface of a wooden back frame with a cushion material, and further covering the entire outer surface with an exterior material such as cloth. Reference numeral 12 denotes two mounting holes provided at both base ends of the backrest at a predetermined interval in the vertical direction, each having a nut embedded therein.

Reference numeral 13 denotes a pair of left and right wooden connecting frames that are integrally formed into a substantially L-shape, and a plurality of through holes 14 are bored in the upright part at predetermined intervals in the vertical direction, and in the horizontal part. has a longitudinally long elongated hole 16 and a bolt insertion hole 15 formed in its front and rear ends. And these two connecting frames 13
Of the through holes 14 in the vertical part on one side, two at arbitrary height positions are connected to the mounting holes 1 of the backrest 11.
2 and are in contact with both sides of the backrest 11, and are screwed and fixed by screws 18, respectively, and the horizontal parts are arranged in contact with both sides of the seat part 3,
The sliding guide pin 10 of the seat part 3 is loosely fitted into the elongated hole 16, and the bolt insertion hole 15 is aligned with one of the screw holes 8 of the seat part 3, so that the handle is attached. It is screwed and fixed by a fixing bolt 17. Note that the elongated hole 16 may be replaced with a groove.

In the above embodiment, when changing and adjusting the position of the backrest, the fixing bolts 1 on both sides of the seat 3
7 in the escape direction and remove it from the screw hole 8 of the seat 3, then move the horizontal part of the connecting frame 13 to the desired position forward or backward by inserting it into the elongated hole 16.
The bolt insertion hole 15 is made to match the screw hole 8 at the desired position by sliding the pin 10 loosely fitted therein as a guide. Next, tighten the fixing bolt 1 with the handle again.
7, by tightening and fixing both horizontal parts to both sides of the seat part 3, the mounting position of the backrest 11 is adjusted to the seat part 3.
can be changed to a desired position in the front-back direction.
The height of the backrest 11 can also be adjusted by removing the screws 18 from the mounting holes 12 of the backrest 11.
1 to a desired height position, align the mounting hole 12 of the backrest 11 after the height change with the through hole 14 of the connecting frame 13 at the corresponding height position, and screw in the screw 18 to secure it. By adjusting the height of the backrest 11, the height of the backrest 11 can be adjusted as desired.

Effects of the invention Since this invention has the above-mentioned configuration, when variably adjusting the longitudinal position of the backrest with respect to the seat, the fixing bolts are loosened and the horizontal part of both connecting frames and the seat are adjusted. Once unfastened from both sides of the horizontal part, use the guiding action of the sliding guide pin to move the horizontal part to any desired position forward or backward, and then tighten the fixing bolts again at the desired position to fix both horizontal parts. By fixing the parts to both sides of the seat, the standing position of the backrest attached between the rising parts of both the connecting frames can be adjusted to any desired position in the front-rear direction of the seat. Therefore, by this adjustment, the effective width of the seat, especially the depth, can be changed, and together with the adjustment of the height of the backrest, it can be adjusted to suit the body shape of the user, from children to adults. Therefore, it can be put to practical use in a manner that provides the most ergonomically suitable sitting posture.

In addition, one pair of left and right connected frames each
It can be securely fixed to the seat by tightening the book fixing bolt, has a very small number of component parts, is structurally simple, and is easy to adjust at first glance. From what we know, the chair can be easily adjusted manually by lower grade children and women, has excellent robustness and has no risk of failure, and has a wooden upper structure as in the example. It has the advantage that it can be conveniently applied without any problems.

[Brief explanation of the drawing]

Figures 1 to 4 show one embodiment of this invention. Figure 1 is a perspective view of the entire chair, Figure 2 is a perspective view of the main parts with one of the connecting frames removed, and Figure 3 is a perspective view of the main part with one of the connecting frames removed. The figure is a cross-sectional view taken along the line A--A in FIG. 1, and FIG. 4 is a cross-sectional view taken along the line B--B in FIG. 3... Seat part, 8... Screw hole, 10... Sliding guide pin, 11... Backrest, 13... Connection frame, 15... Bolt insertion hole, 16... Long hole, 17
...Fixing bolt.

Claims (1)

[Scope of utility model registration request] A backrest is installed in a height-adjustable manner between the rising parts of a pair of left and right connecting frames formed in an approximately L shape, and long holes or grooves in the front-rear direction and bolts are provided in the horizontal parts of both connecting frames. Insertion holes are provided at the front and rear end positions, respectively, and sliding guide pins are provided on both sides of the seat and are loosely fitted into the elongated holes or grooves, and any one of the bolt insertion holes is selected. a plurality of screw holes that are matched with each other, and a fixing bolt that is screwed into any one of these screw holes through the bolt insertion hole and fixes the connecting frame. Backrest position adjustment device.