JPH0620456Y2 - Spring mounting device for backrest tilting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a coil spring mounting device that facilitates the assembly of a tilting device in a chair in which a backrest is elastically tilted by a coil spring. .

[Conventional technology]

Various types of chair backrest tilting devices using various springs are known.

[Problems to be solved by the device]

In all of the tilting devices using the conventional coil springs, the work of assembling the springs is troublesome and the workability is poor, so that the productivity of the chair is hindered.

[Means for Solving the Problems]

The present invention has a pair of left and right notches that are cut from the upper end on the rear upper and right sides of the support base that supports the seat of the chair.
A spring support material with a coil spring fitted with a margin is inserted from above so that it cannot be moved back and forth and left and right, and both ends of the coil spring that face forward are locked in place on the support base and at the center of the coil spring. The above-described problem is solved by locking the locking portion provided rearward to the backrest supporting back rod whose front end is pivotally supported by the front portion of the support base.

[Action]

When fitting the spring support material fitted with the coil spring into the notch of the support base from above, lock both ends of the coil spring that face the front from below in proper places on the support base, and then secure the locking portion of the coil spring. The coil spring can be incorporated into the support base by a very simple operation of locking the front end to the back rod which is pivotally attached to the support base in advance.

〔Example〕

FIG. 4 shows a chair to which the present invention is applied.
Horizontal rectangular plate-shaped support base supported in the center by (1) (2)
On the upper surface of the seat, the reinforcing rod (4a) of the synthetic resin seat plate (4) of the seat (3)
Is stuck. (5) is a cushion.

A pair of left and right back rods (7) (7) supporting the backrest (6) are provided on the outer front parts of the left and right side plates (2a) (2a) of the support base (2).
The lower front part of the horizontal part is pivotally supported by an axis (8).

At the rear of both left and right sides of the flange (2b) of the support base (2), each side plate (2
A pair of left and right notch holes (9) (9) are cut out across a), and a channel-shaped support rod (1) having a bottom surface opening is provided between both notch holes (9) (9).
0) is fitted so as to be detachable from above and immovable forward, backward, leftward and rightward. Locking holes (11) are provided at important points on the upper surface of the support rod (10).
(11) is drilled.

The support rod (10) has a downward gutter-shaped synthetic resin spring support.
(12) is detachably fitted from above, and the projections (13) and (13) protruding from the bottom surface of the spring receiver (12) engage with the locking holes (11) and (11), Lateral movement is prevented. At the left and right ends of the spring bearing (12), retaining stoppers (14) and (14) facing upward are provided upright.

At the rear part of the support plate (15) installed between the center parts on both the left and right sides of the flange (2b) of the support base (2), there is a pair of left and right brackets that bend upward at a position closer to the suspension than the flange (2b). Gutter (16) (1
6) has been formed.

A coil spring (17) is fitted on the support rod (10) and the spring receiver (12) with a margin, and both ends of the coil spring (17) facing forward are fitted in both locking grooves (16) (16). It is engaged from below.
At the center of the coil spring (17), a locking portion (18) which is bent in a U shape and protrudes rearward is formed.

A hook (19a) formed on the upper end of the adjustment rod (19) facing the up-down direction is engaged with the locking portion (18), and the screw portion (19b) at the lower portion of the adjustment rod (19) is attached to the back rod ( 7) It hangs downward.

(20) is a flat channel-shaped connecting plate that connects the lower surfaces of the left and right back rods (7) and (7), and has a trough-shaped groove formed in the center of the connecting plate that faces in the left-right direction and is recessed upward. A horseshoe-shaped washer (22) is fitted in 21).

The threaded portion (19b) of the adjusting rod (19) penetrates the trough-shaped groove (21) and the washer (22), and the nut (24) embedded in the center of the annular synthetic resin handle (23) is inserted therein. It is screwed.

The coil spring (17) includes an adjusting rod (19), a nut (24) and a washer (22).
By urging the horizontal portion of the back rod (7) upward through the connection plate (20) and the connecting plate (20), the backrest (6) is urged forward, and the backrest (6) is It can tilt in response to the leaning stress of the seated person. The biasing force can be adjusted by rotating the handle (23).

To assemble the tilting device described above, first of all, the spring bearing (12)
The coil spring (17) on the spring support material fitted to the support rod (10).
And fit both ends of the support rod (10) to both notches (9) of the support base (2).
(9), and attach both ends of the coil spring (17) to the support plate.
It locks in both locking grooves (16) and (16) of (15) from below.

Then, the hook (19a) of the adjusting rod (19) is engaged with the locking portion (18) of the coil spring (17), and the nut (24) of the handle (23) is screwed into the screw portion (19b). Thus, the lower end of the adjusting rod (19) is locked via the washer (22) to the connecting plate (20) of the back rod (7) whose front end is pivotally supported on the support base (2) in advance.

In the above description, the spring support member includes the support rod (10) and the spring support (1
Although it is composed of 2), the support rod (10) may be formed in substantially the same shape as the spring support member, and the spring receiver (12) may be omitted.

Further, when the frame (2b) is omitted from the support base (2), the notch hole (9) is replaced with a notch groove, and both lower ends of the support rod (10) are notched so that the support base (2) is The lateral movement of the support rod (10) may be prevented by engaging the side plates (2a) (2a).

The means for locking both ends of the coil spring (17) is not limited to the locking groove (16) of the support plate (15).

[Effect of device]

According to the device of the present invention, the work of assembling the coil spring in the support base is much simpler and easier than the conventional device of the same kind, and the productivity of the chair is improved.

[Brief description of drawings]

FIG. 1 is a side view of a central longitudinal section of the present invention, FIG. 2 is a plan view of the same, FIG. 3 is an exploded perspective view showing the relationship between a supporting base, a supporting rod and a spring receiver, and FIG. It is a side view of a chair to which is applied. (1) …… Led rod, (2) …… Supporting base (2a) …… Side plate, (2b) …… Flange (3) …… Seat, (4) …… Seat plate (4a) …… Reinforcing rod, (5) …… Cushion (6) …… Backrest, (7) …… Back rod (8) …… Axis, (9) …… Notch hole (10) …… Support rod, (11) …… Locking hole (12) …… Spring receiver, (13) …… Projection (14) …… Retaining stopper, (15) …… Support plate (16) …… Locking groove, (17) …… Coil spring (18) …… Locking part, (19) …… Adjusting rod (19a) …… Hook, (19b) …… Screw part (20) …… Connecting plate, (21) …… Gutter groove (22) …… Washer, (23 ) …… Handle (24) …… Nut

Claims (1)

[Scope of utility model registration request] Claims: 1. A spring support member having coil springs fitted to a pair of left and right notches facing each other, which are cut out from the upper end on the upper left and right sides of a support base for supporting a seat of a chair, with a margin.
It is removable from above and immovable in the front, rear, left and right,
Both ends of the coil spring facing forward are locked in proper positions on the support base, and a locking part provided at the center of the coil spring facing backward is pivotally supported at the front end of the support base to support the backrest. A spring mounting device in a backrest tilting device that is locked to a rod.