JP4153740B2 - Seat front / rear sliding device in a chair - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a back-and-forth slide device for a seat in a chair.
[0002]
[Prior art]
A chair in which the backrest tilts backward due to the load of a seated person leaning on the backrest and the seat moves back and forth in conjunction with the backrest is known.
The applicant of the present application has dealt with the recent spread of office automation equipment, and finely adjusts the front and rear positions of the seat with respect to the backrest and armrests, for example, when using a personal computer keyboard on a desk, regardless of the back tilt of the backrest. In order to improve the sitting comfort of the seated person and improve the work efficiency of the desk work, a patent application has been filed for an invention that can easily adjust the front and rear position of the seat with a simple mechanism. (Unexamined-Japanese-Patent No. 2002-136376).
[0003]
[Problems to be solved by the invention]
In addition to the above-mentioned object, the present invention provides an easy-to-operate operation for adjusting the front / rear position of the seat, and can stably hold the adjusted position. It is an object of the present invention to provide a front / rear sliding device.
[0004]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
(1) Guide rails are provided in the front-rear direction on the left and right sides of the support base attached to the upper end of the pedestal of the chair, and movable rails provided on the lower left and right sides of the seat are attached to the guide rails so that they can slide back and forth and wherein the hand of the left and right guide rails along the longitudinal direction provided engaged portion, the movable rail sliding on the guide provided engaged portion rails, rotates around the axis in the longitudinal direction A lever member provided with an engaging portion that engages with the engaged portion is attached, and the lever member is elastically biased in a direction in which the engaging portion and the engaged portion are engaged, A seat back-and-forth sliding device in a chair that can release the engaged state by rotating a lever member against elastic biasing, wherein the engaged portion is disposed outside the guide rail. Plural vertical engagement grooves on the side The lever member is provided with an engaging portion including an engaging protrusion that engages with a part of the engaging groove of the engaged portion on the inner end surface, and the lever handle is provided on the lever handle. It is assumed that it comprises a pivot shaft in the front-rear direction, and this pivot shaft is rotatably attached to the movable rail, and a pair of the lever handle is placed above the lever member at a substantially central portion in the front-rear direction of the movable rail. As described above, a seat front and rear sliding device in which a fixed handle protrudes outward is formed .
[0005]
(2) In the above item (1), when the lever member is rotated against the elastic bias, the engagement state can be easily released using both the fixed handle and the lever handle. Like that .
[0006]
(3) In the above item (1) or (2), the fixed handle has a shape substantially the same as the outer end of the lever handle.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
1 and 2 are a front view and a side view, respectively, of a chair provided with a seat front and rear sliding device according to an embodiment of the present invention.
3 is a cross-sectional view taken along the line III-III in FIG. 1, and FIG. 4 is a vertical cross-sectional view taken along the line IV-IV in FIG.
[0008]
As shown in FIGS. 1 and 2, this chair is provided with a gas spring (not shown) in the center of a leg (3) having a leg rod (2) provided with a caster (1) at the tip. A pedestal column (4) is erected, and the rear portion of the support base (5) is fixed to the upper end of the pedestal column (4).
Biasing means for returning the backrest (6) and the seat (7) are provided inside the support base (5).
[0009]
At both ends of the support shaft (8) projecting left and right from the both side walls (5a) and (5a) of the support base (5), a pair of left and right backs that are substantially L-shaped in side view supporting the backrest (6) The cylindrical part (9a) (9a) facing the left-right direction provided in the front end part of the back support bar (9) (9) is fitted, and the back back (6) and the back support bar (9) (9) Is integrated with the support shaft (8) and can be tilted rearward and downward.
An armrest (10) is provided upright in the middle of the forward portion at the lower part of the left and right backrest support rods (9).
[0010]
An upward seat support rod (11) is integrally provided at an intermediate portion between the cylindrical portion (9a) and the armrest (10) of the left and right backrest support rods (9).
[0011]
As shown in FIG. 5 which is a longitudinal sectional view taken along line V-V in FIG. 2 and FIG. 3, the upper and lower ends of the seat support rods (11) are connected to each other by a horizontal rod (12). The rear ends of the pair of left and right guide rails (13) facing in the direction are connected with a shaft (14) facing in the left-right direction.
[0012]
The front end portions of the left and right guide rails (13) and (13) are side walls of the support base (5) as shown in FIG. 6, which is a longitudinal sectional view taken along line VI-VI in FIGS. (5a) The inner surface of the upper end of the left and right support links (16) (16), which are pivotally attached to the outside of the outwardly facing cylinders (15) (15) provided at the front of (5a) Are connected with a horizontal axis (17) facing left and right. Thus, the two support brackets, the seat support rod (11) and the support link (16), which support the front and rear ends of the guide rail (13), abut one support bracket against the inner side surface of the guide rail (13). The other support fitting is supported in contact with the outer side surface of the guide rail (13).
[0013]
A lower end portion of the support link (16) is pivotally attached to the outside of the cylindrical portion (15) with a horizontal axis (18) facing in the left-right direction, and is provided by a torsion coil spring provided in the cylindrical portion (15). 2 is urged counterclockwise in FIG.
[0014]
When the backrest (6) and the backrest support rods (9) and (9) are tilted rearward and downward about the support shaft (8), the backrest support rods (9) and (9) at that time are integral seats. The rear part of the seat (7) is moved rearward and downward by the rearward tilting of the support rods (11) and (11), and in conjunction therewith, the front part of the seat (7) is also moved to the left and right support links (16) ( 16) can be moved slightly rearward and downward by tilting backward against the biasing force of the torsion coil spring.
[0015]
The left and right guide rails (13) and (13) have short leg seats (19) and (19) projecting from the lower surface of the seat (7), and the front and rear ends are fixed and separated from the seat (7). A pair of left and right movable rails (20) and (20) facing the front-rear direction are mounted so as to be slidable in the front-rear direction.
[0016]
As shown in FIG. 4, the short leg seats (19) and (19) projecting from the lower surfaces of the front and rear ends of the seat (7) are provided with female screw holes (19a) in the vertical direction. The front and rear ends of the movable rail (20) are screwed to the lower surface by bolts (21) and (21) inserted from below.
[0017]
As shown in FIGS. 5 and 6, the guide rail (13) has a U-shaped cross-section with outward flanges (13a) (13a) on the left and right sides of the upper end, and the inner center of the U-shaped groove (13b). Further, a support piece (13c) in the front-rear direction having a height of about two-thirds of the depth of the groove is provided upright. As shown in FIG. 4, columnar stoppers (13d) and (13d) are provided in the vicinity of the front and rear ends of the support piece (13c).
[0018]
As shown in FIGS. 5 and 6, the movable rail (20) has a shape in which an inverted trapezoidal fitting part (20a) protrudes from the lower side of a substantially horizontally long cross section, as shown in FIG. As shown, long slide holes (20b) and (20b) are formed in the vicinity of the front and rear end portions before and after penetrating in the vertical direction.
[0019]
A sliding sheet (22) with low sliding resistance is interposed between the guide rail (13) and the movable rail (20) so that the movable rail (20) slides smoothly on the guide rail (13). To get.
[0020]
The sliding sheet (22) has a low-profile U-shaped section with outward flanges (22a) (22a) on the left and right sides of the upper end, and the left and right flanges (22a) (22a) are guided rails. It is placed on the upper surface of the left and right flanges (13a) and (13a) of (13) and is fitted to the upper part of the U-shaped groove (13b) of the guide rail (13). The stopper (13d) of the guide rail (13) is inserted into the through hole (22b) (22b) that is supported by the support piece (13c) of 13) and is drilled in the vicinity of the front and rear ends of the sliding seat (22). By doing so, it is fixed on the guide rail (13).
[0021]
The movable rail (20) has an inverted trapezoidal fitting portion (20a) projecting from the lower surface thereof fitted into the U-shaped groove (22c) of the sliding seat (22) and the guide rail (13 ) Front and rear stoppers (13d) and (13d) are respectively passed through the front and rear slide holes (20b) and (20b), and then bolts (23) and (20) are inserted into the female screw holes provided in the stoppers (13d) and (13d). 23) is screwed together.
[0022]
The diameter of the head (23a) (23a) of the bolt (23) (23) is larger than the width of the slide hole (20b) of the movable rail (20), so that the movable rail (20) becomes the guide rail (13). It is made not to come off from.
The movable rail (20) can slide smoothly back and forth within the range of the length of the slide hole (20b).
[0023]
Position adjustment device for fixing the seat (7) between the guide rail (13) and the movable rail (20) on either side by sliding the seat (7) to a desired position in the front-rear direction and then fixing it (24) is provided.
[0024]
FIG. 7 is a partially enlarged perspective view of the lower part in the broken-line ellipse in FIG.
The position adjusting device (24) includes an engaged portion (25) provided on the guide rail (13) and a movable rail (20). And a lever member (27) having an engaging portion (26) that engages with the engaged portion (25), provided at a substantially central portion in the front-rear direction .
[0025]
FIG. 8 is an exploded top perspective view of the main part of the position adjusting device (24) in FIG.
9 and 10 are a longitudinal sectional view taken along line IX to IX and a longitudinal sectional view taken along line X to X in FIG. 7, respectively.
[0026]
The engaged portion (25) is formed by providing a plurality of vertical engaging grooves (25a) in the front-rear direction on the outer side surface (13e) of the guide rail (13).
[0027]
The lever member (27) includes a plate-shaped lever handle (28), a mounting plate (29) erected on the inner end thereof, and a pivot shaft in the front-rear direction provided on the upper end of the mounting plate (29) ( 30).
[0028]
On the inner end surface (28a) of the lever handle (28), a plurality of engaging projections (28b) arranged in parallel in the front-rear direction are engaged with a part of the engaging groove (25a) of the engaged portion (25). ), And the outer end (28c) is curved outward so that it can be easily handled as a handle.
[0029]
Above the lever member (27) in the substantially central portion of the movable rail (20) in the front-rear direction, the lever handle (28) is paired with the outer end (28c) of the lever handle (28). A fixed handle (31) having substantially the same shape is provided so as to project outward. A concave portion (32) having a rectangular shape in plan view is provided at a position on the upper surface of the movable rail (20) where the fixed handle (31) is provided. Of the bottom surface (33) of the concave portion (32), the outer side The end is provided with an opening (34) that is long in the front-rear direction for allowing the rotation shaft (30) of the lever handle (28) to pass therethrough, and before and after the opening (34) of the rotation shaft (30). Support grooves (35) and (35) having a semicircular cross section for rotatably supporting both ends are provided.
[0030]
After the pivot shaft (30) of the lever handle (28) is supported in the support groove (35) (35), the recess (32) is covered with a cap (36). Near the outer end of the back surface of the cap (36) is provided a semicircular groove (37) that opens downward to complement the semicircular groove of the bearing groove (35) (35). The groove (37), in combination with the support groove (35), supports the rotation shaft (30) of the lever handle (28) so as to be rotatable with a stable position.
[0031]
The cap (36) is fixed by inserting a bolt (38) into each through hole (39) and screwing it into the female screw hole (39a) of the bottom surface (33) of the recess (32).
[0032]
Locking cylinders (41) into which the lower portions of the coil springs (40) can be fitted are provided on the front and rear sides of the upper surface of the lever handle (28), respectively, and the coil springs (40 ) (40) is provided with locking recesses (42) and (42) for locking the upper ends of them.
[0033]
The upper and lower ends of the lever handle (28) are shown in FIG. 10 by the action of the locking recess (42) and the coil springs (40) (40) fitted and locked to the locking cylinder (41). As shown in the figure, the engaging portion (26) of the lever handle (28) is engaged with the engaged portion (25) of the guide rail (13). Match.
[0034]
To adjust the front / rear position of the seat (7), for example, place the thumb of the hand on the upper surface of the fixed handle (31) and the other finger on the lower surface of the lever handle (28), as shown in FIG. The lever handle (28) is rotated around the rotation shaft (30) against the elastic bias by the coil springs (40) and (40), thereby releasing the engaged state and moving the movable rail (20 ) On the guide rail (13) through the sliding seat (22), the front and rear positions of the seat (1) can be easily adjusted.
[0035]
After adjusting the position, when the hand is released from the lever handle (28), the lever handle (28) is again engaged with the engaging portion (26) of the lever handle (28) by the action of elastic bias of the coil spring (40). Is engaged with the engaged portion (25) of the guide rail (13), and the front and rear positions of the seat (7) are fixed at that position.
[0036]
【The invention's effect】
According to the present invention, the following effects can be obtained.
(1) According to the invention described in claim 1, when adjusting the front and rear position of the seat, the lever member is rotated to release the engagement between the engaging portion and the engaged portion, and then the seat is moved. Since the lever portion is elastically biased by a simple operation of simply releasing the lever member after sliding it to the desired front-rear position, the adjusted position can be stably held.
In addition, since the engaged portion is provided on the outer side surface of the guide rail and a plurality of vertical engaging grooves are provided in the front-rear direction, it is easy to engage with the engaging portion and the front and rear of the seat after adjustment The engaged portion that can stably hold the position can be easily formed.
In addition, the lever member is provided with an engaging portion made of an engaging protrusion that engages with a part of the engaging groove of the engaged portion on the inner end surface, and the outer end is curved outward. The lever handle and a pivot shaft in the front-rear direction provided on this lever handle are pivotally attached to the movable rail, so when adjusting the front-rear position of the seat, A lever member that is easy to operate and can be easily and reliably engaged with the engaged portion can be easily formed.
In addition, since the fixed handle protrudes outwardly so as to form a pair with the lever handle above the lever member at the substantially central portion in the front-rear direction of the movable rail, it is easy to hang a hand as a handle. The operation for adjusting the front / rear position of the seat can be further facilitated.
[0037]
(2) According to the invention described in claim 2, when the lever member is rotated against the elastic bias, the engagement state is released using both the fixed handle and the lever handle. Since it can be easily performed, the operation for adjusting the front and rear position of the seat can be further facilitated.
[0038]
(3) According to the invention described in claim 3, since the fixed handle has a shape substantially the same as that of the outer end of the lever handle, it is easy to put a hand as a handle together with the lever handle.
[Brief description of the drawings]
FIG. 1 is a front view of a chair provided with a seat front and rear sliding device according to an embodiment of the present invention.
FIG. 2 is also a side view of the chair.
3 is a cross-sectional view taken along line III-III in FIG.
4 is a vertical cross-sectional view taken along the line IV-IV in FIG.
FIG. 5 is also a longitudinal sectional view taken along line V-V in FIG. 3;
6 is also a longitudinal sectional view taken along line VI-VI in FIG.
7 is a partially enlarged perspective view of the lower part in the ellipse of the broken line in FIG. 2. FIG.
8 is an exploded top perspective view of the main part of the position adjusting device in FIG. 7. FIG.
9 is also a longitudinal sectional view taken along line IX to IX in FIG.
10 is a longitudinal sectional view taken along the line X-X in FIG. 7 and shows a state in which the engaging portion of the lever handle is engaged with the engaged portion of the guide rail.
11 is a view similar to FIG. 10, showing a state in which the engagement between the engaging portion of the lever handle and the engaged portion of the guide rail is released.
[Explanation of symbols]
(1) Caster
(2) Legs
(3) Leg
(4) pedestal
(5) Support base
(5a) Side wall
(6) Backrest
(7) Seat
(8) Support shaft
(9) Back support
(9a) Tube part
(10) Armrest
(11) Seat support rod
(12) Yokohama
(13) Guide rail
(13a) Buttocks
(13b) U-shaped groove
(13c) Support piece
(13d) Stopper
(13e) Outer side
(14) Axis
(15) Tube part
(16) Support link
(17) (18) Horizontal axis
(19) Leg seat
(19a) Female screw hole
(20) Movable rail
(20a) Mating part
(20b) Slide hole
(21) Bolt
(22) Sliding sheet
(22a) Buttocks
(22b) Through hole
(22c) U-shaped groove
(23) Bolt
(23a) Head
(24) Position adjustment device
(25) Engaged part
(25a) Engaging groove
(26) Engagement part
(27) Lever member
(28) Lever handle
(28a) Inner end face
(28b) Engagement protrusion
(28c) Outer end
(29) Mounting plate
(30) Rotating shaft
(31) Fixed handle
(32) Recess
(33) Bottom
(34) Opening
(35) Bearing groove
(36) Cap
(37) Semicircular groove
(38) Bolt
(39) Through hole
(39a) Female screw hole
(40) Coil spring
(41) Locking cylinder
(42) Locking recess

Claims (3)

Guide rails are provided in the front-rear direction on the left and right sides of the support base attached to the upper end of the pedestal in the chair, and the movable rails provided on the lower left and right sides of the seat are attached to the guide rails so as to be slidable back and forth, the hand of left and right guide rails along the longitudinal direction provided engaged portion, the movable rail sliding on this guide rail having a engaged portion, rotatable about an axis in the longitudinal direction, A lever member provided with an engaging portion that engages with the engaged portion is attached, and the lever member is elastically biased in a direction in which the engaging portion and the engaged portion are engaged, and the lever member is A back-and-forth slide device for a seat in a chair that can be released from the engaged state by rotating against an elastic bias ,
The engagement portion is provided with a plurality of vertical engagement grooves on the outer side surface of the guide rail in the front-rear direction, and the lever member is provided on the inner end surface with a part of the engagement groove of the engagement portion. The lever handle is provided with an engaging portion made of an engaging projection that engages with the lever handle, and a pivot shaft in the front-rear direction provided on the lever handle. The pivot shaft is rotatably attached to the movable rail. With
A forward / backward sliding device for a seat in a chair , wherein a fixed handle protrudes outwardly so as to form a pair with the lever handle above the lever member at a substantially central portion in the front-rear direction of the movable rail. . The lever member can be easily released from the engaged state by using both the fixed handle and the lever handle when the lever member is rotated against the elastic bias. A back-and-forth sliding device for a seat in the chair according to claim 1 . The seat front and rear sliding device according to claim 1 or 2, wherein the fixed handle has a shape substantially the same as the outer end of the lever handle .

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