JP2004202055A - Chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple-structured chair to be inexpensively manufactured, capable of energizing a leg rod in good balance and smoothly by a torsion coil spring and storing the torsion coil spring compactly and in good appearance. <P>SOLUTION: A cylindrical body 32 facing in the left/right directions is attached to the lower end of the leg rod 11, and a pivot 12 is inserted into a shaft hole 34 formed nearly at the center of each end cap 33 for closing either end of the cylindrical body 32. Winding parts 13a of a pair of left and right torsion coil springs 13 are disposed on both ends of the cylindrical body 32, and an extension end part 13b extending from the end on the inner side of each winding part 13a is engaged with a through hole formed on the inner side of the cylindrical body 32 to open inside the leg rod 11. At the same time, an extension end part 13c on the outer side is made to pierce a notch 36, long in the circumferential direction and formed on the outer surface of the end cap 33 to be locked with a base 5. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair in which a seat and a leg supporting the seat move forward toward a desk when not in use. More specifically, the present invention relates to a support for a spring for urging a leg forward. Regarding the structure.
[0002]
[Prior art]
In a chair of this type, a seat is fixed to an upper end portion of a single leg pivotally attached to a lower part of a counter, a floor surface in front of a desk, or the like with a left-right axis. The rod is tilted rearward to be able to rotate from a use position where the seat is supported substantially horizontally, to a substantially vertical or forward tilt, to an unused position where the seat is stored under the counter or desk, In addition, there is one in which a leg rod is constantly biased toward a non-use position (for example, see Patent Documents 1 to 3).
[0003]
[Patent Document 1]
Japanese Utility Model Laid-Open No. 5-21745 (pages 1-2, FIG. 2).
[Patent Document 2]
Japanese Patent No. 2815341 (pages 1 to 4, FIG. 1).
[Patent Document 3]
JP-B-58-36857 (pages 1-2, FIG. 2).
[0004]
[Problems to be solved by the invention]
However, in the above-described conventional device, an arm or the like is integrally provided at the lower end of the leg rod, and the compression coil spring is contracted between the tip of the arm and the base that pivotally supports the leg rod. (For example, see Patent Literatures 1 and 2), a large accommodation space is required for accommodating the arm and the compression coil spring in the base, and the base becomes large and hinders a foot of a seated person.
[0005]
Further, there is a type in which a torsion coil spring is provided only on one side of a mounting shaft that pivotally supports the leg rod (for example, see Patent Document 3). According to this, the biasing force of the torsion coil spring acts on the leg rod in a balanced manner. However, there is a problem that the mounting shaft is twisted or the rotation of the leg rod is not smooth, which is not preferable, and that the torsion coil spring is exposed to the outside and is unsightly.
[0006]
The present invention has been made in consideration of the above-described problems of the related art, and allows a leg rod to be urged in a well-balanced and smooth manner by a torsion coil spring, and accommodates the torsion coil spring compactly in a good shape. It is an object of the present invention to provide a chair which is simple in structure and can be manufactured at low cost.
[0007]
[Means for Solving the Problems]
According to the present invention, the above-mentioned problem is solved as follows.
(1) The lower end of the leg rod supporting the seat is pivotally attached to the base with a pivot point in the left-right direction, so that the seat and the leg rod are rotated between a non-use position in front and a use position in rear. In a chair in which the seat and the leg are always biased toward a non-use position by a biasing means, a tubular body facing left and right is fixed to a lower end of the leg, and The pivot is inserted through a shaft hole provided substantially at the center of an end cap that closes both ends of the body, and wound on both sides of the cylindrical body from both ends of a coil-shaped winding portion wound around the pivot. A pair of left and right torsion coil springs serving as biasing means, wherein the extending portion of the wire extends toward the outside of the winding portion, the winding portion is provided, and an inner end of the winding portion is provided. An extension end extending from the portion is provided on the inner surface of the cylindrical body so as to open into the leg rod. The extended end portion engaging with the hole and extending from the outer end portion of the winding portion is penetrated into a circumferentially long notch provided in an end cap or the outer peripheral portion of the cylindrical body, Lock to base.
[0008]
(2) In the above item (1), a sleeve is provided between the pivot and the winding portions of the two torsion coil springs.
[0009]
(3) In the above item (1) or (2), the base is provided with a concave portion into which the cylindrical body and the end cap can be fitted, and the outer extending end of the double torsion coil spring is provided on the inner surface on both sides of the concave portion. An engaging portion with which the portion can be provided.
[0010]
(4) In any one of the above items (1) to (3), an outer cylindrical portion fitted to the end of the cylindrical body is formed on the inner end surface of the end cap, concentric with the outer cylindrical portion, and a pivot is fitted therein. An inner tube portion is provided, and the outer end of the winding portion of the torsion coil spring is fitted between the inner and outer tube portions, and the torsion coil is inserted into a notch provided in a part of the outer tube portion. The outer extending end of the spring is inserted.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
1 and 3 show a state when the chair according to an embodiment of the present invention is in the use position, FIGS. 2 and 4 show a state when the chair is in the non-use position, and FIGS. Indicates details of each part.
[0012]
The chair (1) has an anchor bolt (4) on the floor (3) behind the desk (2) (see the imaginary line in FIG. 4) (the left side in FIGS. 1 to 4 is the front). A vertical leg post (6) is provided approximately at the center of the fixed base (5).
[0013]
The leg support (6) is made of a tubular material having an oblong cross section that is long in the front-rear direction, and a central portion of a horizontal rod (7) facing left and right is fixed to an upper end thereof via a mounting plate (7a). .
[0014]
Receiving rollers (8) are pivotally mounted on both end surfaces of the horizontal rod (7) with horizontal shafts (9) facing left and right.
At the rear center of the base (5), a lower end of a backrest support rod (11) for supporting the backrest (10) is pivotally mounted with a pivot (12) pointing in the left-right direction.
[0015]
The backrest support rod (11) is arranged around the pivot (12), and one end is fixed to the backrest support rod (11) and the other end is fixed to the base (5). The pair of torsion coil springs (urging means) (13) (13) are constantly urged toward a direction in which the coil springs stand forward, that is, toward a non-use position.
The details of the structure of the portion of the backrest support rod (11) including the torsion coil springs (13) pivotally attached to the base (5) at the lower end will be described later.
[0016]
The lower half of the backrest support rod (11) is formed by a single square tube (14), and the upper half of the left and right ends is fixed to the upper end of the square tube (14) by welding or the like. The backrest frame (17) is formed by a backrest frame (17) having an upward U-shape when viewed from the front, comprising a horizontal rod (15) facing in the direction, and a pair of left and right side rods (16) rising from both side ends thereof. ) Are supported by the left and right side rods (16).
[0017]
At the front and rear portions of the lower surface of the seat body (18), both ends of a seat support plate (19) (20) facing in the left and right direction are fixed, and on both sides of the seat support plate (19) (20). A pair of left and right rails (21) (21) facing in the front-rear direction and having an inward U-shaped cross section is fixed by welding or the like.
[0018]
The left and right receiving rollers (8) and (8) are fitted into the two rails (21) and (21) from inside, whereby the seat body (18) can move in the front-rear direction and the receiving rollers ( 8) and (8) can be rotated around the axes (9) and (9).
[0019]
On the lower surface on both sides of the rear seat support plate (20), the bearing fittings (22) (22), the central U-shaped bearing part (22a) (22a), the backrest support rod (11) The horizontal rod (15) is fitted to the both sides from below, and the upper end of the bearing (22a) is fixed so as to be closed by the lower surface of the seat support plate (20), whereby the seat body (18) The rear end portion is connected to an intermediate portion of the backrest support rod (11) so as to be rotatable around a left-right direction axis.
[0020]
As shown in FIGS. 1 and 3, the seat body (18) is substantially horizontal, the backrest support rod (11) is inclined rearward, and the center front part of the mounting plate (7a) of the horizontal rod (7) is The backrest support rod (11) is raised from the use position in contact with the inverted L-shaped stopper (23) viewed from the side fixed to the lower surface of the central portion of the front seat support plate (19). When rotated by a required angle, as shown in FIGS. 2 and 4, the horizontal rod (15), which is the connecting portion between the seat body (18) and the back support rod (11), is higher than the receiving roller (8). The seat body (18) is inclined forward and downward, and the center rear surface of the horizontal rod (7) is in contact with a stopper (24) provided on the lower surface of the center portion of the rear seat support plate (19). Position.
[0021]
The rear stopper (24) is provided at the front end of a front-rearward adjusting screw (27) screwed into the screw hole (26) of the block (25) fixed to the lower surface of the center portion of the seat support plate (19), By rotating the adjusting screw (27), its front and rear position can be adjusted.
[0022]
A cover (28) is detachably provided on the lower surface of the seat body (18) so as to cover the rails (21), (21) and the like. At the approximate center of the cover (28), there is a long hole (29) in the front-rear direction through which the leg post (6) can be inserted, and a rectangular through-hole (30) through which the backrest support rod (11) is inserted. Is provided. A substantially U-shaped notch (31) through which the horizontal rod (15) is inserted is provided at a rising edge at both rear portions of the cover (28).
[0023]
Since the backrest support rod (11) is urged forward by the torsion coil spring (13), the chair (1) is always close to the desk (2) as shown in FIG. The seat (1) is located behind the chair (1).
[0024]
To use the chair (1), the backrest support rod (11) together with the backrest (10) is tilted backward to the use position against the urging force of the torsion coil spring (13), and the seat body (18) ) Is horizontal and sit on it.
[0025]
After use, when the occupant separates from the chair (1), the backrest support rod (11) is rotated forward by the urging force of the torsion coil spring (13), and the seat body (18) is accordingly moved. The chair (1) is stopped at the non-use position by moving downward, sloping downward, reaching the non-use position, and contacting the stopper (25) with the center of the horizontal rod (7).
[0026]
The above configuration is substantially the same as that described in the specification and drawings attached to the application of Japanese Patent Application No. 2002-302462 filed by the present applicant, but the present invention provides the following backrest support rod. It is characterized by the structure of the portion of the lower end of (11) pivotally attached to the base (5).
That is, as shown in FIG. 8, a tubular body (32) facing left and right is fixed to the lower end of the backrest support rod (11), which is a leg rod, and an end cap that closes both ends of the tubular body (32). The pivot (12) is inserted into a shaft hole (34) provided substantially at the center of (33), and a coiled coil wound around the pivot (12) is provided on both sides in the cylindrical body (32). Biasing means such that extending ends (13b) and (13c) of the windings extend outward from both ends of the winding portion (13a) in a tangential direction at both ends of the winding portion (13a). The winding portions (13a) and (13a) of the pair of left and right torsion coil springs (13) and (13) are provided, and extend from the inner end of each winding portion (13a). (13b) (13b) is fitted into through-holes (35) (35) provided on the inner surface of the cylinder (32) so as to open into the backrest support rod (11), and is inserted into the cylinder (32). The extended ends (13c) (13c) which are locked (see FIG. 5) and extend from the outer end of the winding portion (13a) are attached to the outer peripheral portion of the end cap (33). Through the-out long notches (35) in the girder circumferential direction and is locked to the base (5).
[0027]
The base (5) has an isosceles triangular shape in plan view with the apex facing forward, and has a mountain-like side shape with the apex positioned slightly toward the rear end, and the bottom is substantially horizontal at the front center. A shallow concave portion (37) for receiving the lower end of the leg post (6) is provided at the center of the rear portion, and is continuous with the rear end of the concave portion (37), and at the lower end of the backrest support rod (11). (33), a deep recess (38) for accommodating the end cap (33), etc., and a recess (39) for mounting an anchor bolt (4) are provided at three places, a front end and rear sides. Has been.
[0028]
Outer extending ends (13c) (13c) of the left and right torsion coil springs (13) and (13) are provided on both sides of the stepped portion of the central front and rear concave portions (37) and (38) in the base (5). A vertically long slot (40) is provided so as to be fitted and locked, and the upper end of the long hole (40) has an engagement portion with which the extension end (13c) engages. I am doing.
[0029]
On the inner end surface of each end cap (33), an outer cylindrical portion (33a) fitted to the end of the cylindrical body (32) and concentric with it, and a pivot (12) was inserted therein. An inner cylindrical portion (33b) is provided, and the outer end of the winding portion (13a) of the torsion coil spring (13) is fitted between the inner and outer cylindrical portions (33b) (33a), and the outer cylindrical portion is provided. A notch (36) provided in a part of (33a) is adapted to be inserted into an outer extending end (13c) of the torsion coil spring (13).
[0030]
Around the pivot (12) between the left and right end caps (33), (33), a sleeve (41) made of a synthetic resin or the like having a small friction coefficient and good lubricity is externally fitted. By externally fitting the winding portion (13a) of both torsion coil springs (13), the torsion coil spring (13) does not directly contact the pivot (12), and the backrest support rod (11) rotates smoothly. It can move.
[0031]
At both ends of the sleeve (41), short diameter reducing steps (41a) that fit into the shaft holes (34) of the end caps (33) are provided. A bush (42) made of the same material as the sleeve (41) is fitted to the outer end of the shaft hole (34) so that the backrest support rod (11) can rotate more smoothly. .
[0032]
After the pivot (12) is inserted into the shaft hole (43) facing in the left and right direction provided on both side walls of the concave portion (38) at the rear center of the base (5), it is prevented from coming out of the shaft hole (43). Therefore, headed screws (44) are screwed to both ends of the pivot (12).
[0033]
It should be noted that the present invention is not limited to only the above-described embodiment, and can be implemented in various modified forms.
[0034]
Further, the present invention is also applied to a chair in which only a single leg rod having no leg support (6) can be tilted back and forth, as described in Patent Documents 1 to 3 described above. You can do it.
[0035]
【The invention's effect】
According to the first aspect of the present invention, most of the pair of left and right torsion coil springs are compactly accommodated in the cylinder and are hardly exposed to the outside. With the torsion coil spring, the spring can be urged in a well-balanced and smooth manner, and can be manufactured at a low cost with a simple structure.
[0036]
According to the second aspect of the present invention, since the winding portion of the coil spring does not directly contact the pivot, wear thereof can be prevented, durability can be improved, and sliding at the time of rotation of the leg rod can be achieved. Generation of abnormal noise such as sound can be prevented.
[0037]
According to the third aspect of the present invention, the cylindrical body and the end cap are fitted into the concave portion of the base, and the torsion coil spring housed in the cylindrical body also has an outer extending end that extends outside the cylindrical body. Since the engaging portions provided on the inner surfaces on both sides of the concave portion are engaged, the torsion coil spring is hardly exposed to the outside, and the appearance is good.
[0038]
According to the fourth aspect of the invention, the winding portion of the torsion coil spring is stably held by the inner and outer cylindrical portions provided on the end cap, and the torsion coil spring moves in the axial direction when the leg is rotated. Can be prevented, and the end cap can be firmly fitted to the end of the cylinder by the outer cylinder, so that the cylinder can be accurately positioned with respect to the pivot.
[Brief description of the drawings]
FIG. 1 is an external perspective view of an embodiment of the present invention as viewed obliquely from a front when used.
FIG. 2 is a perspective view showing a similar external appearance when it is in a non-use position.
FIG. 3 is a longitudinal sectional side view of the center when the position is the use position.
FIG. 4 is also a longitudinal sectional side view of the center when it is in an unused position.
FIG. 5 is an enlarged vertical sectional front view taken along the line VV of FIG. 3;
6 is an enlarged vertical sectional view taken along the line VI-VI in FIG. 3;
FIG. 7 is an enlarged vertical sectional front view taken along line VII-VII of FIG. 3;
FIG. 8 is an exploded perspective view of a pivoted portion of the lower end portion of the backrest supporting rod to a base.
[Explanation of symbols]
(1) Chair
(2) Desk
(3) Floor surface
(4) Anchor bolt
(5) Base
(6) Leg support
(7) Horizontal rod
(7a) Mounting plate
(8) Receiving roller
(9) axis
(10) Backrest
(11) Backrest support rod (leg rod)
(12) Axis
(13) Torsion coil spring (biasing means)
(13a)
(13b) (13c) winding part
(14) Square tube
(15) Horizontal rod
(16) Side rod
(17) Backrest frame
(18) Seat
(19) (20) Seat support plate
(21) Rail
(22) Bearing bracket
(22a) Bearing
(23) Stopper
(24) Stopper
(25) Block
(26) Screw hole
(27) Adjustment screw
(28) Cover
(29) Slot
(30) Through hole
(31) Cut
(32) Cylinder
(33) End cap
(34) Shaft hole
(35) Through hole
(36) Notch
(37) (38) (39) Recess
(40) Slot (engagement part)
(41) Sleeve
(41a) Reduced diameter step
(42) Bush
(43) Shaft hole
(44) Headed screw

Claims (4)

By pivotally attaching the lower end of the leg rod supporting the seat to the base with a pivot pointing in the left-right direction, the seat and the leg rod can be turned between a non-use position in front and a use position in rear, And in a chair in which the seat and the leg are constantly biased toward the non-use position by a biasing means, a left-right cylinder is fixed to a lower end of the leg and both ends of the cylinder are fixed. The pivot is inserted through a shaft hole provided substantially at the center of an end cap that closes the end cap, and the winding is extended from both ends of the coil-shaped winding portion wound around the pivot on both sides in the cylindrical body. The winding portion of a pair of right and left torsion coil springs serving as biasing means, having an extended end portion extending toward the outside of the winding portion, is disposed, and extends from an inner end of the winding portion. The projecting extension end is inserted into a through hole provided on the inner surface of the cylindrical body so as to open into the leg rod. The extended end extending from the outer end of the winding portion and extending from the outer end of the wound portion is penetrated through a notch provided in the outer peripheral portion of the end cap or the cylindrical body so as to be engaged with the base. A chair characterized by being stopped. The chair according to claim 1, wherein a sleeve is provided between the pivot and the winding portion of the two torsion coil springs. The base is provided with a concave portion into which the cylinder and the end cap can be fitted, and the inner surface on both sides of the concave portion is provided with an engaging portion with which the outer extended end portion of each of the torsion coil springs can be engaged. The chair according to 1 or 2. On the inner end face of the end cap, an outer cylinder part fitted to the end of the cylinder, and an inner cylinder part concentric with the inner cylinder and having a pivot inserted therein are provided, between the inner and outer cylinder parts. The outer extended end of the torsion coil spring is inserted into a notch provided in a part of the outer cylindrical portion while fitting the outer end of the winding portion in the torsion coil spring. Chair according to any of the above.

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