JP3128746B2 - Chair backrest tilting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front horizontal portion at a lower end of a back rod and a seat lower portion when a backrest of a chair is tilted.
Between the surface after the end or seat support for supporting base, relates backrest tilting device to prevent the clothes or objects is sandwiched.

[0002]

2. Description of the Related Art FIGS. 4 and 5 show an example of an office chair provided with a conventional backrest tilting device. A horizontal arm is provided at the upper end of a leg (2) provided at the center of a leg (1). the support base (3) is solid deposition <br/>, on the upper surface of the support base (3), the seat (4) is installed.

Slightly in front of the leg rod (2) in the support base (3), a horizontal portion at the lower end of a pair of right and left back rods (5) having an inverted L-shaped side surface and being parallel to each other. the front end of (5a) (5a) is pivotally supported on a front surface upper portion of Se杆(5) vertical section of (5) (5b) (5b), backrest (6) is installed.

[0004] underside strategic points Se杆(5) horizontal section of (5) (5a) (5a)
The erection is a connecting plate (7) between the handle (8) is inserted from below, the upper end of the handle (8), an end to the upper end of Ashi杆(2) in the support base (3) Locked torsion coil spring
(9) other end is engaged in the backrest (6) it is adjustably biased toward front upward.

[0005] In the above-mentioned chair, in a normal state, the backrest (6) is moved by the force of the torsion coil spring (9) as shown in FIG.
Has become an upright state, the horizontal portion of Se杆(5) (5) (5a ) (5
a) it is close substantially form a horizontal, on the side lower end after the seat (4) (4a). Thus, the gap between them (10) is small, the seated person leans on the backrest (6), as shown in FIG. 5, the back
Rod (5), together with the backrest (6) is tilted rearward and downward against the torsion coil spring (9), the horizontal portion (5a) is side lower <br/> end after the seat (4) (4a ), The gap (10) expands.

[0006]

When [0005] According to backrest tilting device of the aforementioned chair while seated person, in the gap that has expanded in the backrest after傾時, pledged relatively thick clothing and articles When the backrest is returned to the normal state, the gap may be reduced and clothes or articles may be strongly sandwiched in the gap.

[0007]

According to the present invention SUMMARY OF], the support base provided at the center portion of the lower surface of the seat, the Se杆supporting the backrest
The forward horizontal portion definitive vertically pivoted rotatably pivotally supported, in the chair that the longitudinal tilting Saseu so that the backrest, the seat,
Covers the seat plate with high cushioning properties and the underside of the seat plate.
The seat cover, and the seat cover,
Peripheral side where the periphery rises to the bottom of the ship, and upper at the center
A horizontal step that projects in the direction of
A concave that opens downward as it goes to the forward horizontal portion of the rod
Suspended piece that have a section are formed integrally, and further, the central portion
Having a horizontal upward step protruding upward,
The front horizontal portion of the back rod is lowered into the recess of the hanging piece.
From above, and into the recess on the lower surface of the upward step,
The above problem was solved by fixing the upper end of the support base.
You.

[0008] Incidentally, the horizontal portion of the Se杆is Oite in front of the recess of the suspending piece, it is preferable provided with a closure plate covering the recess.

[0009]

According to the device of the present invention, the hanging piece suspended from the rear end of the lower surface of the seat is formed around the wide gap created between the horizontal portion and the rear lower end of the seat by the back rod tilting rearward and downward. the circumference Munode,
The clothes and goods from entering Ru is prevented.

[0010] If a closing plate is provided in the horizontal portion, the gap is more sufficiently surrounded , and safety is improved.

[0011]

1 to 3 show a chair to which the present invention is applied. The same members as those described above are denoted by the same reference numerals and description thereof will be omitted.

[0012] seat (11) includes a seat plate having a high cushioning property (11a), a seat cover covering the lower periphery of the seat plate (11a) (11
Are I Do from b). Seat cover (11b) includes a peripheral side portion of the peripheral is present I rising ship bottom shaped (11c), upward stepped portion of the horizontal projecting Oite on <br/> facing the central portion and (11d) the provided, it is formed by molding a synthetic resin material. Upward stage portion of the horizontal (11d)
Of the lower surface of the recess, the upper end of the support base (3) is fixed.

[0013] the seat plate (11a) is placed on the upper surface of the vertical and horizontal reinforcing provided on the upper surface of the seat cover (11b) ribs (not shown), both are fixed appropriately.

At the rear end of the seat cover (11b), a hanging piece (12) hanging down toward the horizontal portion (5a) of the back rod (5) is integrally formed at the same time as the resin molding of the seat cover (11b). It is provided by molding.

At the lower end of the hanging piece (12), a pair of left and right upward recesses into which the horizontal portions (5a) (5a) can be fitted from below when the back rod (5) is tilted forward and upward. Groove (13) (13) provided
Is, the upper edge of the both concave grooves (13), when is tilted Se杆(5) towards the front is a normal state, the horizontal portion (5a) is defined to be adjacent .

The horizontal portions (5a) (5a) of the back rods (5) (5)
And the rear end of the connecting plate (7), tilting of up rear lower limit Se杆(5)
Even if the closure plate covering the upper front side of the recessed groove (13) (14) are projected.

[0017] The above-described chair according to the present invention, like the prior art chair, it is possible to tilt the backrest (6), and
By the time this was allowed to tilt, since the periphery of the enlarged gap (10) is surrounded by a vertical <br/> lower piece (12) closure plate (14), a possibility that clothing or objects is inserted is not Na .

[0018] Although not shown, the seat cover (11b) and suspending piece of seat (4) to (12), also be configured separately,
Seat plate and (11a) and the suspended piece seat cover (11b) and (12), all integral
As a synthetic resin.

[0019]

A suspended piece digits set on the lower surface rear end of the seat according to the present invention, closure plate provided upright from the horizontal portion of the Se杆is, when allowed to tilt the backrest rearward and downward, and the lower surface rear end of the seat Se杆since surrounding the wide gap occurring between the horizontal portion, clothing or objects is not <br/> Re Rukoto inserted into the gap.

Further , the cover of the seat and the hanging piece can be provided integrally and inexpensively by a synthetic resin , and can be provided simply and inexpensively.

[Brief description of the drawings]

1 is a partially cutaway side view definitive the normal state of the present invention the applied chair.

FIG. 2 is a partially cutaway side view in a state where the backrest is tilted backward.

[Figure 3] also is a rear view definitive to the normal state.

4 is a partially cutaway side view definitive the normal state of the conventional chair.

5 is a partially cutaway side view definitive state that the rearward tilt of the backrest of the chair of Figure 4.

[Explanation of symbols]

(1) running legs (2) Ashi杆(3) support base (4) seats (4a) side lower after the seat (5) Se杆(5a) horizontal section (5b) vertical section (6) backrest (7) Connecting plate (8) Handle (9) Torsion coil spring (10) Clearance (11) Seat (11a) Seat plate (11b) Seat cover (11c) Peripheral side (11d) Horizontal upward step (12) Hanging piece ( 13) Recessed groove (14) Closure plate

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A47C 3/00-7/48

Claims (2)

(57) [Claims] To 1. A support base provided at the center portion of the lower surface of the seat, the forward horizontal portion of Se杆for supporting the backrest vertically pivoted rotatably pivotally supported, and so the backrest capable of tilting back and forth In a chair, a seat is provided with a seat plate having high cushioning property and a lower side of the seat plate.
And a seat cover that covers the surrounding area.
The bars are located on the peripheral side where the periphery rises to the bottom
Has a horizontal step protruding upward, and a peripheral side portion
To the front horizontal portion of the back rod, and downward.
A depending piece having an opening recess is integrally formed,
In addition, there is a horizontal upward step protruding upward at the center.
The recessed portion of the hanging piece has the back rod facing forward.
The horizontal part is fitted from below, and the concave part on the lower surface of the upward step part.
The backrest tilting device for a chair , wherein the upper end of the support is fixed . 2. The backrest tilting device for a chair according to claim 1, wherein the horizontal portion of the back bar includes a closing plate that covers the recess in front of the recess of the hanging piece.