JP4188678B2 - Chair - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chair used in a school classroom, a lecture hall, or the like, in which the backrest is moved forward toward the desk when not in use.
[0002]
[Prior art]
As a conventional chair of this type, a seat is fixed to the upper end of a leg column pivotally attached to the lower part of the counter with a shaft facing in the left-right direction, and the leg column is tilted backward to make the seat almost horizontal. There is one in which a spring is constantly biased from a supporting use position toward a non-use position in which the seat is accommodated under the counter in a substantially vertical direction (for example, see Patent Document 1).
[0003]
There is also a parallel link mechanism that allows the seat body to be moved in the front-rear direction from the use position to the non-use position close to the desk (see, for example, Patent Document 2).
[0004]
[Patent Document 1]
Japanese Patent No. 2815341 (pages 3 to 4, FIG. 1).
[Patent Document 2]
JP 2000-139603 A (pages 2 to 3, FIG. 1).
[0005]
[Problems to be solved by the invention]
However, in the former, since the seat is fixed integrally with the leg column, the seat surface tilts forward as the leg column rotates when the seat is not in use. If the unused position is left on the load, there is a problem that the load falls from the seat.
[0006]
In the latter, since the seat body is supported by only two parallel links inclined backward when in the use position, a heavy load is applied to the lower end of each parallel link, and the structure must be strong. Further, when the seat moves to the front unused position, the seat is lifted upward in the middle of movement along with the rotation of the parallel link, so a large storage space must be secured below the desk accordingly. I must.
[0007]
In view of the above-mentioned problems of the prior art, the present invention can stably and strongly support the seat during use, and can move the seat in a horizontal state when not in use. An object of the present invention is to provide a chair that can be compactly accommodated under a desk, has a simple structure, and can be manufactured at low cost.
[0008]
[Means for Solving the Problems]
According to the present invention, the seat support base is provided at the upper end portion of the leg support erected on the base, and the seat body is slidably mounted in the front-rear direction to support the backrest. The lower end is pivotally attached to the lower end of the base or the leg column with a shaft that faces in the left-right direction, and the rear part of the seat is supported by the backrest, and the backrest is interlocked with the rotation in the front-rear direction. Then, it is linked by the linkage means so as to move in the front-rear direction.
[0009]
(2) In the above paragraph (1), the linking means is slidably engaged with the backrest slidably in the longitudinal direction at both ends of the left and right shafts supported rotatably on the seat body. It is assumed that a moving member is provided continuously.
[0010]
(3) In the above item (1) or (2), an urging means for urging the seat body forward is provided between the seat support base and the seat body.
[0011]
(4) In any one of the above items (1) to (3), a plurality of receiving rollers are axially attached to both sides of the seat support base, and inwardly facing the front-rear direction provided on both sides of the lower surface of the seat body A U-shaped rail is fitted on each receiving roller.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
1 and 3 show the state when the chair according to the embodiment of the present invention is used, FIG. 2 shows the state of both the use position and the non-use position, and FIG. 4 shows the state of the non-use position. FIG. 5 shows details of the main part.
[0013]
This chair (1) has an anchor bolt (4) on the floor (3) behind the desk (2) (see the imaginary line in FIG. 2) (the left side in FIGS. 2 to 5 is the front). It is provided with a vertical leg column (6) erected substantially at the center of the fixed base (5). The lower end portion and the base of the leg column (6) are covered with a cover (7) (see the imaginary line in FIGS. 1 to 4).
[0014]
The leg column (6) is formed of a square tube, and the center of the lower surface of a shallow rectangular box-shaped seat support (8) having an upper surface opened is fixed to the upper end thereof by welding. A front wall (8a), a rear wall (8b), and a pair of left and right side walls (8c) facing upward are provided on the four edges of the seat support base (8).
[0015]
A pair of front and rear receiving rollers (9) and (9) are pivotally attached to the outer surface side of both side walls (8c) and (8c) with horizontal shafts (10) facing left and right.
[0016]
Seat support plates (12) and (13) facing the left-right direction are fixed to the front and rear portions of the lower surface of the seat body (11), and the both sides of the seat support plates (12) and (13) are In addition, a pair of left and right rails (14) and (14) whose cross-sectional shape is inwardly U-shaped are fixed by welding or the like. The lower portions of the front ends of the rails (14) and (14) are connected to each other by a front connecting member (16) having an inverted L shape in side view, and the rear ends are connected to each other by a rear connecting member (17) having a vertical plate shape. . Short opening pieces 14a and 14a are formed on the inner opening edges of the rails 14 and 14 so as to be vertically inward.
[0017]
Both rails (14) and (14) are externally fitted to the four receiving rollers (9) pivotally attached to both side walls (8c) and (8c) of the seat support base (8). 11) can move forward and backward.
[0018]
A hook member (18) is fixed to the center of the front surface of the rear connecting member (17), and an engagement hook (19) is fixed to the center of the rear surface of the front wall (8a) of the seat support base (8). Both ends of the tension coil spring (20), which is a biasing means, are locked between the engagement hook (19). The seat body (11) is constantly urged forward by this tension coil spring (20), that is, toward the non-use position. A notch portion (8d) through which the tension coil spring (20) is inserted is formed at the center of the rear wall (8b).
[0019]
The backrest (21) is formed by bending a tube with a circular cross section, and the upper half forms an inverted U-shaped backrest support (21a) that supports the backrest (22) The lower half further includes a guide support portion (21b) extending linearly from both lower ends of the backrest support portion (21a) to a position reaching the lower side of the seat body (11) and a guide support portion. It was bent inward from the lower end of the portion (21b) and pivotally attached with the shaft (23) pointing in the left-right direction so as to sandwich both side surfaces of the lower end of the leg strut (6) from the outside. It consists of a pivot (21c).
[0020]
Bearing brackets (24) and (24) are mounted on the lower surface of the rear part of the left and right rails (14) and (14), and U-shaped bearings (24a) and (24a) in the center are connected to the linkage means (25). The shaft (26) facing in the left-right direction is fixed to both sides of the shaft (26a) from below, and the upper end of the bearing portion (24a) is fixed so as to be closed by the lower surfaces of the rails (14) (14). (26) is connected so as to be rotatable about an axis facing in the left-right direction.
[0021]
The linking means (25) is fixedly fitted to both ends of the shaft (26) with mounting boss portions (27a) continuously provided in a T shape on the inner surface of the central portion of the cylindrical sliding member (27). It is made of what you did. The sliding member (27) is provided with a sliding support hole (27b) penetrating in a direction perpendicular to the axial direction of the mounting boss portion (27a), and is combined with the inner peripheral portion of the sliding support hole (27b). A sleeve (28) formed of a low friction material such as resin is press-fitted. The guide support portion (21b) of the backrest support (21) is slidably inserted into the slide support hole (27b) of the slide member (27) fixed to both ends of the shaft (26). .
[0022]
By the linkage means (25), the backrest (21) and the seat (11) are moved in the front-rear direction in conjunction with the back-and-forth rotation of the backrest (21). Are linked to each other.
[0023]
As shown in FIGS. 1 and 3, the front body 11 is almost horizontal, the backrest 21 is tilted rearward, and is fixed to the front lower surface of the rails 14, 14. From the use position (solid line in FIG. 2) where the stopper (29) fixed to the center of the rear surface of the member (16) is in contact with the front surface of the leg support (6), the back support (21) is moved forward. When the required angle is turned to stand up, the rear surface of the rear connecting member (17) for connecting the rear ends of the rails (14) and (14) as shown in FIG. It becomes a non-use position (state of an imaginary line in Drawing 2) contacted with a stopper (30) fixed to a rear surface of back wall (8b) of support base (8).
[0024]
A cover (31) is detachably provided on the lower surface of the seat (11) so as to cover the rails (14) (14) and the like. Near the center of the cover (28) is a long hole (not shown) through which the leg strut (6) is inserted and a through hole (31a) through which the shaft (26) of the linkage means (25) is inserted (see FIG. 5).
[0025]
Since the backrest (21) is urged forward by the tension coil spring (20), the chair (1) is always provided with a desk (2) as shown in FIGS. ) Is located in a non-use position in the vicinity of the chair (1), and a passage through which a person can pass is formed behind the chair (1).
[0026]
To use the chair (1), the backrest (22) and the backrest support (21) are rotated backward against the urging force of the tension coil spring (20). Accordingly, the seat body (11) linked to the backrest support (21) via the linkage means (25) is moved rearward, and the stopper (29) comes into contact with the front surface of the leg column (6). Therefore, the robot is stopped at the use position, and is seated on the seat body (11) in that state.
[0027]
After use, when the chair (1) is separated from the chair (1), the seat body (11) is moved forward by the biasing force of the tension coil spring (20), and accordingly, the seat body (11) is connected to the seat body (11) via the linking means (25). The linked backrest (21) is rotated forward, the stopper (30) comes into contact with the front surface of the rear connecting member (17), and the chair (1) is stopped at the non-use position.
[0028]
According to this embodiment, when in the use position, the front portion of the seat body (11) can be stably and strongly supported by the leg support (6) and the rear portion by the backrest support (21). In addition, when not in use, the seat (11) is moved forward in the horizontal state to be compactly accommodated below the desk (2), and a passage that allows people to pass behind the chair (1) is provided. Can be formed. Therefore, it is possible to prevent the luggage from falling from the seat body (11) even if the luggage is left on the seat body (11) and inadvertently placed in the unused position. Moreover, it is not necessary to secure a large storage space below the desk (2). Furthermore, since the chair (1) of this embodiment has a simple structure, it can be manufactured at low cost.
[0029]
In addition, this invention is not limited only to the said embodiment, It can implement in many modified aspects.
[0030]
For example, the linkage means (25) has an engagement pin projecting inward from the guide support portion (21b) of the backrest support (21), and is engaged with the engagement pin on the rear side surface of the seat (11). It can also be carried out by forming a long hole in the vertical direction that can be combined and engaging both. In other words, any structure may be used as long as the rotation of the backrest support (21) can be converted into the longitudinal movement of the seat (11).
[0031]
In the above embodiment, the pivot portion (21c) at the lower end portion of the backrest support (21) is pivotally attached to both side surfaces of the lower end portion of the leg strut (6) with the axis (23) facing in the left-right direction. However, the pivot (21c) may be pivotally attached to the base (5).
[0032]
【The invention's effect】
According to the first aspect of the invention, when in the use position, the front part of the seat body can be stably and strongly supported by the leg support and the back part by the backrest support, and when not in use. The seat body can be moved forward in a substantially horizontal state to be compactly accommodated under the desk, and a passage that allows a person to pass behind the chair can be formed. Therefore, even if the baggage is placed on the seat body and inadvertently placed in the unused position, the baggage does not fall from the seat body. Moreover, it is not necessary to secure a large accommodation space below the desk.
[0033]
According to the second aspect of the present invention, the linking means can operate smoothly, can have a simple structure, and can be manufactured at low cost.
[0034]
According to the third aspect of the present invention, the urging means can be accommodated in the hollow portion below the seat body in a compact manner so as not to be exposed to the outside.
[0035]
According to the invention of claim 4, even if there is only one leg support, the front portion of the seat body can be stably supported by the plurality of receiving rollers spaced from side to side, and the inward U-shape When the receiving roller is fitted to the rail, it is possible not only to smoothly guide the longitudinal movement of the seat body but also to prevent the seat body from moving upward and downward.
[Brief description of the drawings]
FIG. 1 is an external perspective view of an embodiment of the present invention viewed obliquely from the front when it is in a use position.
FIG. 2 is a side view showing a solid line when it is in the use position and an imaginary line when it is in the non-use position.
FIG. 3 is a longitudinal side view taken longitudinally at the center of the rail when in the use position.
4 is a longitudinal side view similar to FIG. 3 when it is in a non-use position. FIG.
FIG. 5 is an enlarged vertical front view taken along line VV in FIG. 4;
[Explanation of symbols]
(1) Chair
(2) Desk
(3) Floor surface
(4) Anchor bolt
(5) Base
(6) Leg support
(7) Cover
(8) Zodiac base
(8a) Front wall
(8b) Rear wall
(8c) Side wall
(8d) Notch
(9) Receiving roller
(10) axis
(11) Seat
(12) (13) Seat support plate
(14) Rail
(14a) Folded piece
(16) Front connecting member
(17) Rear connecting member
(18) Hook member
(19) Engagement hook
(20) Tension coil spring (biasing means)
(21) Backrest support
(21a) Backrest support
(21b) Guide support
(21c) Pivot
(22) Backrest
(23) Axis
(24) Bearing bracket
(24a) Bearing part
(25) Linkage means
(26) axis
(27) Sliding member
(27a) Mounting boss
(27b) Sliding support hole
(28) Sleeve
(29) Stopper
(30) Stopper
(31) Cover
(31a) Through hole

Claims (4)

A seat support base is provided at the upper end of the leg strut standing on the base, the seat body is slidably mounted in the front-rear direction on the seat support base, and the lower end of the backrest support that supports the backrest is It is pivotally attached to the lower end of the base or the leg column with an axis that faces in the left-right direction, and the rear part of the seat is supported on the backrest, in conjunction with the back-and-forth rotation of the backrest. A chair characterized by being linked by linkage means so as to move to The linking means is configured such that a sliding member that is slidably engaged with the backrest slidably in the longitudinal direction is connected to both ends of a shaft facing in the left-right direction that is rotatably supported by the seat body. Item 1. The chair according to Item 1. The chair according to claim 1 or 2, wherein a biasing means for biasing the seat body forward is provided between the seat support base and the seat body. A plurality of receiving rollers are pivotally attached to both sides of the seat support base, and inwardly U-shaped rails facing in the front-rear direction provided on both sides of the lower surface of the seat body are externally fitted to each receiving roller. The chair in any one of -3.

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