JPH0537792Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Field of industrial application] This invention allows the seat to be tilted forward, the backrest to be tilted backward, or both the seat and backrest to be tilted, depending on the preference of the person sitting on the chair. This relates to a device that can perform

[Conventional technology]

As a tilting device for the backrest of a chair, for example, as described in Japanese Utility Model Publication No. 38-17139, Japanese Utility Model Application Publication No. 55-66320, Japanese Utility Model Application Publication No. 1987-143049, and Japanese Patent Publication No. 61-2363. , those using springs are well known.

Also, devices are known that use gas springs or the like to tilt either the backrest or the seat.

[The problem that the idea attempts to solve]

The conventional device described above can only tilt either the backrest or the seat, but requires two sets of devices to tilt both, resulting in a complex structure and an unsightly appearance. .

[Means to solve the problem]

This invention fixes the rear part of the support frame to the upper end of the leg rod, and in the support frame, immediately in front of the leg rod, there is a support base that supports the seat and surrounds the support frame, and a pair of left and right back rods that support the backrest. The front lower end of the support frame is pivoted with a pivot pointing in the left-right direction, and stop rods pointing in the left-right direction are penetrated through the front part of the support frame and are centered on the said pivot. While engaging the arcuate hole,
Immediately behind the support frame on the support base, a coil spring facing in the left-right direction is supported with a support rod, and both ends of the coil spring facing forward are locked to the rear portions of both sides of the support frame,
In addition, the locking portion formed rearward in the center of the coil spring is connected to the connecting plate connecting the left and right back rods below the support base using an adjustable rod facing in the vertical direction and whose length can be adjusted. This is an attempt to solve the above-mentioned problem.

[Effect]

According to the device of the present invention, the support base and the back rod are pivotally supported by one pivot on the support frame at the upper end of the leg rod, the front end is locked to the support base, and the front end is locked to the support frame, and the back rod is locked in the center facing rearward. The seat is rotatable against a coil spring connected to the back rod, and the stop rod engages with an arcuate hole in the support frame, so the tilting range of the seat is restricted.

Furthermore, the upper end of the adjustment rod comes into contact with the lower surface of the seat plate, thereby restricting the tilting range of the back rod.

Therefore, when the chair is empty, the seat is held almost horizontally and the backrest is held almost vertically, and the seat can be tilted forward or the backrest can be tilted back to a desired angle depending on the position and posture of the seater's center of gravity. Or,
Alternatively, the seat and backrest can be tilted at the same time.

〔Example〕

The drawing shows an embodiment of the present invention, in which a support frame 2 in the form of a horizontal downward channel is provided at the upper end of the leg rod 1, and a vertical mounting tube 3 penetrating through the rear end is attached to the upper end of the leg rod 1. It is attached by fitting into the rod 1.

Fitted into the rear part of the support frame 2 is a mounting plate 4 whose front face is bent into a U-shape, overlaps the bottom and both side surfaces of the support frame 2, and has both ends protruding upward. , the locking tools 5, 5 are pivotally connected with a pivot shaft 6 facing in the left-right direction.

Immediately in front of the leg rod 1 in the support frame 2, there is a support frame 2 having a rectangular plate shape for supporting the seat plate 8 (cushion not shown) of the seat 7 from below.
The front ends of a pair of left and right back rods 10, 10 for supporting the supporting base 9 surrounding the and the backrest (not shown) are
They are pivoted around a common pivot 11 that faces left and right. Reference numeral 12 denotes a spacer fitted between the support frame 2 and the outer surface of the support base 9 with a pivot 11 .

At the front of the support base 9, there is a locking rod 13 facing left and right.
The locking rod 13 passes through arc-shaped holes 14, 14 centered around the pivot shaft 11, which are bored in the front portions of both side plates of the support frame 2.

A pair of left and right notch holes 15, 15 are provided at the rear upper ends of the left and right side plates 9a of the support base 9, spanning the outward facing pieces 9b.
A support rod 16 facing left and right in a downward channel shape is fitted into both notch holes 15, 15 so as to be detachable from above and immovable back and forth and left and right. A pair of left and right locking holes 17, 17 are bored at key points on the upper surface of the support rod 16.

A downward gutter-shaped spring receiver 18 facing left and right is removably fitted to the support rod 16 from above, and projections 1 are drilled from key points on the lower surface of the spring receiver 18.
9 and 19 are engaged with the locking holes 17 and 17, thereby preventing the spring receiver 18 from moving laterally. There are retainers 2 on both left and right ends of the spring receiver 18.
0 and 20 are set up.

A coil spring 2 is attached to the support rod 16 and the spring receiver 18.
1 is fitted on the outside with plenty of room. coil spring 2
A locking portion 21a is formed in the center of 1. The locking portion 21a is bent into a U-shape and protrudes rearward.

The left and right back rods 10, 10 are connected slightly behind the leg rod 1 by a flat upward channel-shaped connecting plate 22. An upwardly recessed portion 23 having a hole 23a in the center is formed in the center of the connecting plate 22.

Forward rods 21b at both ends of the coil spring 21,
21b engages with the lower surface of the locking tools 5, 5 of the support frame 2, and the locking portion 21a, which also faces rearward at the center, engages with a hook 25a formed at the upper end of the adjustment rod 25 facing in the vertical direction. It matches.

The threaded portion 25b at the lower end of the adjustment rod 25 passes through the hole 23a in the connecting plate 22 and the washer 24 in contact with the lower surface thereof, and a nut 27 integral with the synthetic resin handle 26 is screwed into the lower end. has been done.

In the above-mentioned chair, when the seat is vacant, the front rod 21b of the coil spring 21, as shown in FIG.
21b, the portion of the support base 9 rearward of the pivot 11 is urged downward via the spring receiver 18 and the support rod 16. Therefore, the seat 7 is rotated so that its front end faces upward until the stop lever 13 abuts the upper end of the arcuate hole 14 of the support frame 2, and the seat 7 is substantially horizontal.

In addition, the locking portion 21a of the coil spring 21 allows
Adjusting rod 25, handle 26, washer 24, and connecting plate 2
2, the pivot 11 in both back rods 10, 10
The more rearward portion is biased upward. Therefore, the lower portions of both back bars 10, 10 rotate upward until the hook 25a of the adjustment lever 25 comes into contact with the lower surface of the seat plate 8, and the upper portions of both back bars 10, 10 become almost vertical. There is.

When a person sits on the seat 7, the seat 7, together with the seat plate 8, tilts forward against the coil spring 21 in accordance with the load, the longitudinal position of the center of gravity, and the biasing force of the coil spring 21.

When the user leans against the backrest, the backrest tilts backward against the coil spring 21 in response to the load and the biasing force of the coil spring 21.

When the user leans against the backrest with the center of gravity at the upper front of the seat, the seat 7 leans forward and the backrest leans back, as shown in FIG.

The biasing force of the coil spring 21 can be adjusted according to the physique and preference of the seated person by rotating the handle 26 and changing the actual length of the adjustment rod 25.

〔Effect of the invention〕

Depending on the physique and preferences of the occupant, the seat can be tilted forward, the backrest can be tilted backwards, or the seat and backrest can be tilted at the same time.

Moreover, the spring used is a simple coil spring 1.
Only one piece is required, making the configuration simple and compact.
It does not spoil the appearance of the chair and can be manufactured at low cost.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of an embodiment of the device of the present invention;
Figure 2 is a longitudinal side view of the center when the seat is empty;
The figure also shows a plan view with the seat removed, and the fourth
The figure is also a central longitudinal side view when the passenger is seated. 1...Leg rod, 2...Support frame, 3...Mounting tube, 4
...Mounting plate, 5...Locking tool, 6...Pivot, 7...
Seat, 8... Seat plate, 9a... Side plate, 9b... Outward piece, 9... Support base, 10... Back rod, 11... Pivot,
12... Spacer, 13... Stop rod, 14... Arc-shaped hole, 15... Notch hole, 16... Support rod, 17...
... Locking hole, 18 ... Spring receiver, 19 ... Protrusion, 2
0...Preventing from coming off, 21...Coil spring, 21a...
...Locking part, 21b...Front-facing rod, 22...Connection plate,
23... Upward recess, 23a... Hole, 24... Washer, 25... Adjustment rod, 25a... Hook, 25b
...screw part, 26...handle, 27...nut.

Claims (1)

[Scope of utility model registration request] The rear part of the support frame is fixed to the upper end of the leg rod, and the support base that supports the seat and surrounds the support frame and the front lower ends of the pair of left and right back rods that support the backrest are attached immediately in front of the leg rod in this support frame. , is pivoted with a pivot that faces left and right, and a stop rod that faces left and right and penetrates through the front part of the support frame is connected to an arcuate hole centered on the pivot that is drilled on both sides of the support frame. At the same time, immediately behind the support frame on the support base, a coil spring facing left and right is supported with a support rod, both ends of the coil spring facing forward are locked to the rear of both sides of the support frame, and the coil spring is A locking part formed toward the rear in the center of is attached to the connecting plate that connects the left and right back bars below the support base.
It has an adjustable rod that faces up and down and has an adjustable length.
A tilting device for the chair back and seat that are linked together.