JPH0436683Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present application relates to a seat body for a chair that can stand up and is used in theaters and the like.

2. Description of the Related Art In general, the seat of a fixed chair used in theaters, etc. is always maintained in an upright position by an automatic upright mechanism equipped with a coil spring, and when in use, it collapses against the elastic biasing force of the coil spring. It is configured as follows.

By the way, a base shaft is passed through the rear part of a seat body constructed from a conventional blow-formed seat plate in the lateral direction, and both ends thereof are fixed to the left and right leg members, and the base shaft and the seat body are connected to each other. A chair with a coil spring that maintains the seat in an upright state at all times and increases the elastic force when the seat is reclined is known, for example, from Japanese Utility Model Application No. 77445/1983. The seat body of this known chair has a relatively large first recess formed in the left and right outer surfaces of the blow-molded seat plate from the side to the rear and back, and the base shaft is inserted into the first recess. A second recess having a shaft hole was formed, and an arm plate having the shaft hole was fitted into the first recess and secured with screws.

Problems to be solved by the invention However, according to the above-mentioned conventional configuration, the entire metal arm plate is largely exposed on the outer surface of the seat body, which not only significantly spoils the appearance but also makes the arm plate Since it exists only on the outer surface of the seat plate, there was a defect in that the mechanical strength was poor, especially in the part that supported the base shaft.

Means for Solving the Problems Therefore, in order to improve the conventional defects, the present application has a vertically elongated hollow side wall, a recessed portion extending in the transverse direction at the rear of the upper surface, and an outer surface of the rear of the side surface inwardly. the outer surface recess is opposed to the recess, the rear part of the side wall is formed into a double layer, and the hollow part of the side wall is opened by a slit at the position of the outer surface recess. The base of the support fitting is fitted into the outer recess of the seat plate, and the plate-shaped arm extending forward of the base is inserted into the side wall hollow through the slit, and the end of the recess is fitted. , with a bracket interposed,
A rear part of the side wall of the seat plate is held between this receiving fitting and the base of the supporting fitting, and these are fixed together, and a shaft hole is passed through this position.

Function: The base of the support fitting is fitted into the recess on the outer surface of the blow-formed seat plate, and the plate-like arm of the support fitting is inserted into the hollow part of the side wall through the slit, and the recess is inserted into the hollow part of the side wall. A receiving metal fitting is interposed in the end portion of the seat plate, and the side portion of the seat plate is held between the receiving metal fitting and the base of the supporting metal fitting, and this holding portion is fixed with screws or the like.

The seat configured in this manner has a base shaft provided with a coil spring interposed in the concave portion, and both ends thereof protrude outward from the shaft hole.
By fixing both of the protruding ends to the pair of left and right leg members, it can be mounted on the leg members so as to be able to rise and fall freely.

Embodiments The embodiments of the present application will be described in detail below with reference to the drawings.
Reference numeral 1 denotes a seat plate made by blow molding, and the upper surface of the seat plate 1 is shallowly recessed. A seat made of cushion material is installed in the recess 2, and the rear position of the seat plate 1 is shallowly recessed. A concave portion 3 is formed which extends in the width direction and is slightly wider at both ends thereof.

As shown in FIGS. 4 and 5, the left and right side surfaces of the seat plate 1 are bulged in a hollow shape, and the outer surface is slightly depressed inward at the position of the concave portion 3.
the third so that the hollow bulge 5 closes at the position
As shown in the figure, it is twice as thick as the material, and a shaft hole 6 is bored in the center of the recess 4.

The recess 4 extends to the back position, and the hollow bulge 5 is at the position of the recess 4.
It is opened by a slit 7.

Reference numerals 8a and 8b are supporting metal fittings having base parts 9a and 9b bent into an L-shape and narrow plate-like arms 10a and 10b integrally extended in front of the hanging pieces. are provided with shaft holes 11a, 11b and outwardly directed shaft pins 12a, 12b, respectively.

Reference numerals 13a and 13b are metal holders having a U-shaped cross section and having shaft holes 14a and 14b in their vertical surfaces.

Therefore, when configuring the seat body, the supporting metal fittings 8a, 8
At the same time, the plate arms 11a and 11b are inserted into the seat plate 1 through the slit 8.
It is inserted into the hollow bulge 5 on the side surface. Further, the rear side surface portion of the seat plate 1 is held between the vertical surfaces of the support fittings 13a and 13b at both ends of the concave portion 3 and the hanging pieces of the bases 9a and 9b of the support fittings 8a and 8b. , and in a state where the shaft holes 14a, 6, 11a and the shaft holes 14b, 6, 11b are aligned with each other, they are screwed together.

In addition, a base shaft 15 having a coil spring (not shown) is interposed in the concave portion 3 of the seat configured as described above, and both ends of the base shaft 15 protrude outside from the shaft holes at the left and right positions. Both ends are pivoted to a pair of left and right leg members 16. Also, shaft pin 1
2a and 12b are leg members 16 when the seat body is collapsed.
It comes into contact with a protrusion (not shown) provided at the top to prevent further collapse.

Effects of the Device As described above, according to the present application, the rear both sides of the seat plate through which the base shaft is inserted are sandwiched between the base of the support fitting and the receiving metal fitting, and the plate-shaped arms of the support fitting are attached to the seat plate. Since it is inserted into the hollow part of the side wall of the seat plate, it has excellent mechanical strength and durability, and since the metal part is only exposed at the rear of the seat plate, it looks good, and the base shaft can be recessed from the top of the seat plate. Since the seat body can be inserted into the leg member, it has the advantage that it is possible to easily attach the seat body to the leg member via the base shaft.

[Brief explanation of drawings]

The drawings show an embodiment of the present application, and FIG. 1 is an exploded perspective view, FIG. 2 is an enlarged sectional view of the main part, and FIGS. 3 to 5 are taken along lines AA and B- in FIG. 1. B line and C
- It is an enlarged cross-sectional view of the C line. In the figure, 1 is a seat plate, 3 is a recessed part, 4 is a recessed part, and 5
is a hollow bulge, 6a and 6b are support fittings, 8
a, 8b are bases, 9a, 9b are plate-like arms, 12
A and 12b are shaft pins, and 13a and 13b are metal fittings.

Claims (1)

[Claims for Utility Model Registration] (1) It has a vertically elongated hollow side wall, is provided with a recessed portion extending in the horizontal direction at the rear of the upper surface, and is recessed inwardly on the outer surface of the rear portion of the side surface, and this outer surface recessed portion is connected to the recessed portion. A supporting metal fitting is attached to the outer recess of the seat plate, the rear part of the side wall of which is formed in a double layer, and the hollow part of the side wall is formed by blow-forming with a slit opening at the position of the outer recess. At the same time, a plate-shaped arm extending forward of the base is inserted into the side wall hollow part through the slit, and a receiving metal fitting is inserted into the end of the recessed part to insert the receiving part. A seat body for a chair, characterized in that a rear part of a side wall of a seat plate is held between a metal fitting and a base of the support metal fitting, and these are fixed together, and a shaft hole is passed through this position. (2) Insert the base of the support fitting from the outer recess of the seat plate.
A seat body for a chair according to claim 1, which is formed in an L-shape so as to span the back surface. (3) The seat body for a chair according to claim 1, in which the receiving metal fitting is formed in a U-shape.