JPS6118767Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an attachment device that allows a back plate support arm and a seat plate to be attached easily and reliably.

Chairs such as swivel chairs that are generally used for office purposes have a support column erected on the legs with casters, a seat plate attached to the upper end of the support column, and a roughly L-shaped back support arm attached horizontally to the bottom of the seat plate. The back plate is fixed to the vertical piece of the back plate support arm.

By the way, in conventional chairs, the L-shaped back support arm and the bottom surface of the seat board are directly fixed with screws, etc., or they are attached using simple mounting brackets, so there is some looseness at the attachment point of the back support arm. This tends to cause the back plate support arm to tilt or sway to some extent, resulting in poor stability.

The present invention solves the above-mentioned drawbacks by providing a mounting device that can mount and fix the back plate support arm in a predetermined position without causing play.

Next, the present invention will be explained with reference to the embodiments shown in the drawings. Reference numeral 1 denotes a substantially L-shaped back plate support arm made of an elastic plate, and its horizontal piece 1a fits into a mounting bracket 2 attached to the bottom of the seat plate. Retained.

FIG. 2 is a perspective view of the mounting bracket 2 seen from the bottom, and the mounting bracket 2 is made up of a T-shaped member as a whole by connecting square pipes 2a and 2b orthogonally. A column receiving member 3, into which the upper end of the column is fitted, protrudes from the lower surface of the square pipe 2a near the connecting portion. 4 is a screw for fixing the mounting bracket 2 to the bottom surface of the seat plate; 5 is a driving protrusion formed on both sides of one square pipe 2a of the mounting bracket 2 near the opening end; and 6 is a driving protrusion that projects inward of the pipe; Similarly, a folded piece 7 is cut and raised from the upper surface 2a' near the opening of one square pipe 2a toward the inside of the pipe.
8 is a long hole formed in the lower surface of one square pipe 2a.
is a hole for inserting a screwdriver for operating the screw 4. Further, 9 is a tightening screw that fixes the horizontal piece 1a of the back plate support arm 1 inserted into one square pipe 2a, and 10 is a screw provided at the tip of the horizontal piece of the back plate support arm through which the tightening screw is inserted. Hole 11 is the back plate.

The present invention is based on the above configuration, and first, the mounting bracket 2
The mounting bracket 2 is fixed to the lower surface of the seat plate A with screws 4 so that one square pipe 2a faces the rear of the seat plate A. When tightening the screw 4, use a hole for inserting a screwdriver as appropriate.

Next, attach the back plate support arm 1 to one square pipe 2a.
Insert and fit the horizontal piece 1a. At this time, the lateral side surface of the back plate support arm 1 is held under pinch pressure between the driving protrusions 5, 5, and the upper and lower surfaces of the back plate support arm 1 are held under pinch pressure by the lower surface of the mounting bracket 2 and the inclined folding piece 6. be done. The back plate support arm 1 inserted and fitted into the mounting bracket 2 in this way fits snugly without wobbling in the vertical and horizontal directions, and since the folding piece 6 has appropriate elasticity, the presser foot prevents wobbling. becomes certain.

Next, after adjusting the insertion depth of the horizontal piece 1a of the back plate support arm 1, screw the tightening screw 9 into the screw hole 10 of the back plate support arm via the long hole 7, and tighten it in this state. When the set screws are tightened, the back plate support arm and the mounting bracket are integrally fixed.

As mentioned above, the present invention has protrusions and folded pieces formed on the inner surface of the mounting bracket to prevent the back plate support arm from vertically moving and swaying, so the back plate support arm is completely free from wobbling. It is possible to provide a chair with excellent stability, and also has the advantages that the mounting operation to the seat plate is simple, and the mounting fittings themselves are easy to manufacture and can be obtained at low cost.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a perspective view of the back plate support arm, FIG. 2 is a bottom perspective view of the mounting bracket, and FIG. 3 is a front view with the back plate support arm attached. - line sectional view of , Figure 4 is the same -
FIG. In the figure, 1 is a back plate support arm, 1a is a horizontal piece, 2 is a mounting bracket, 5 is a protrusion, 6 is a folded piece, 7 is a long hole, 10
is a tightening screw.

Claims (1)

[Scope of utility model registration request] The horizontal piece attachment part of the back plate support arm in the mounting bracket attached to the lower surface of the seat plate is formed from a square pipe, and protrusions that protrude inward on both sides of this square pipe are also formed from the upper or lower surface. The horizontal piece of the back plate support arm is inserted into the position of the protrusion and the folded piece, and is screwed onto the square pipe with a tightening screw. A device for attaching a back plate support arm and a seat plate in a chair comprising: