JP4547019B2 - Seat front / rear sliding device in a chair - Google Patents

Description

  The present invention relates to a back-and-forth slide device for a seat in a chair.

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.
On the other hand, the applicant of the present application copes 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 was first filed for an invention in which the front and rear position of the seat can be easily adjusted with a simple mechanism. (See Patent Document 1).
JP 2002-136376 A

  In addition to the above-mentioned object, the present invention is not limited even when the seat bends due to sitting, especially when the sheet-like member stretched on the seat frame is large, or when the seat frame is deformed due to long-term use. It is an object of the present invention to provide a seat back-and-forth sliding device for a chair that can satisfactorily adjust the front-rear position of the seat without hindrance.

According to the present invention, the above problem is solved as follows.
(1) A guide rail facing in the front-rear direction is provided above and below the base attached to the upper end of the pedestal in the chair, and the front and rear ends are secured with leg seats protruding from the lower surface of the front and rear ends of the seat. Thus, a pair of left and right movable rails facing in the front-rear direction is provided, and the movable rail is a front-rear sliding device for a seat in a chair attached to the guide rail so as to be slidable back and forth.

(2) In the above item (1), an upward columnar stopper is provided in the vicinity of the front and rear ends of the guide rail, and a long slide hole is formed in the vicinity of the front and rear ends of the movable rail before and after penetrating in the vertical direction. The movable rail is attached to the guide rail so as to be slidable back and forth by passing the front and rear stoppers through the front and rear slide holes, respectively.

(3) In the above item (2), a bolt is attached to the stopper provided on the guide rail from above, the diameter of the head of this bolt is made larger than the width of the slide hole of the movable rail, and the movable rail is guided by Do not come off the rail.

(4) In the above item (2) or (3), the guide rail has a U-shaped cross section, and the movable rail has an inverted trapezoidal fitting portion protruding from the lower side of the substantially square shape. The movable rail is attached to the guide rail so as to be slidable back and forth by fitting the fitting portion of the movable rail into the U-shaped groove of the U-shaped cross section of the guide rail.

(5) In the above item (4), a support piece in the front-rear direction is erected in the center of the U-shaped groove of the guide rail, and a stopper is provided in the vicinity of the front and rear ends of the support piece.

(6) In any one of the above items (1) to (5), a sliding sheet having a low sliding resistance is interposed between the guide rail and the movable rail.

According to the present invention, the following effects can be obtained.
(1) According to the first aspect of the present invention, the guide rails facing in the front-rear direction are provided on the left and right upper sides of the base attached to the upper end of the pedestal in the chair, and the legs project from the lower surfaces of the front and rear ends of the seat. A pair of left and right movable rails facing in the front-rear direction is provided by fixing the front and rear ends with a seat, and the movable rail is attached to the guide rail so that it can slide back and forth. When the seat is bent due to the seating of the seat and the seat is bent, the space for the bending can be secured, and the movable rail is not deformed by the bending, and the front and rear position of the seat is adjusted satisfactorily. be able to.
Further, even when the seat is deformed due to use for many years, the movable rail is not deformed thereby.

  (2) According to the invention described in claim 2, an upward columnar stopper is provided in the vicinity of the front and rear end portions of the guide rail, and a long slide hole is formed in the vicinity of the front and rear end portions of the movable rail in the front and rear direction. Since the movable rail is slidably attached to the guide rail by penetrating the front and rear stoppers through the front and rear slide holes, the movable rail can be moved within the range of the length of the slide hole. , Can be slid smoothly back and forth.

(3) According to the invention described in claim 3, a bolt is attached to the stopper provided on the guide rail from above, and the diameter of the head of the bolt is made larger than the width of the slide hole of the movable rail so as to be movable. Since the rail does not come off the guide rail, the movable rail can be smoothly slid back and forth within the range of the length of the slide hole.

(4) According to the invention described in claim 4, the guide rail has a U-shaped cross section, and the cross section has a shape in which an inverted trapezoidal fitting portion protrudes from the lower side of the movable rail. Since the movable rail is attached to the guide rail so as to be slidable back and forth by fitting the fitting portion of the movable rail into the U-shaped groove of the U-shaped cross section of the guide rail. The rail can be smoothly slid on the guide rail.

(5) According to the invention described in claim 5, since the support piece in the front-rear direction is erected in the center of the U-shaped groove of the guide rail, and the stopper is provided in the vicinity of the front and rear ends of the support piece. The movable rail can be smoothly slid back and forth within the range of the length of the slide hole.

(6) According to the invention described in claim 6, since the sliding sheet having a low sliding resistance is interposed between the guide rail and the movable rail, the movable rail is smoothly slid on the guide rail. be able to.

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.

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).

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).

  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).

  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.

  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).

  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.

  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.

  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.

  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.

  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).

  As shown in FIGS. 5 and 6, the movable rail (20) has a shape in which an inverted trapezoidal fitting portion (20a) protrudes from a 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.

  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.

  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).

  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.

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).

  Between the guide rail (13) and the movable rail (20), there is provided a position adjusting device for adjusting the seat (7) by sliding it to a desired position in the front-rear direction and then fixing the seat (7) at that position.

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 an engagement provided on the movable rail (20) to engage with the engaged portion (25). And a lever member (27) having a portion (26).

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.

  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).

  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).

  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.

  A fixed handle (31) having substantially the same shape as that of the outer end (28c) of the lever handle (28) is projected outwardly at a substantially central portion of the movable rail (20) in the front-rear direction. 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.

  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.

  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).

  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.

  As shown in FIG. 10, the upper and lower ends of the lever handle (28) are as shown in FIG. 10 by the action of the locking concave hole (42) and the coil springs (40) and (40) locked to the locking cylinder (41). The engaging portion (26) of the lever handle (28) is engaged with the engaged portion (25) of the guide rail (13). ing.

  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.

  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.

The seat (7) is formed by attaching an outer peripheral portion of a sheet-like member, for example, a net member (44), to a seat frame (43). Specific embodiments thereof will be described below.
FIG. 12 is an exploded perspective view showing an embodiment of the structure of the seat (7).
FIG. 13 is an enlarged longitudinal sectional view showing the outer end portion of the structure of the seat (7), and FIG. 14 is an enlarged longitudinal sectional view showing the same in an exploded manner.

  As shown in FIGS. 12 to 14, the seat (7) is made of a high-tensile plastic or other appropriate material along the upper surface and the outer surface of the seat frame (43) having a desired closed shape, for example, elastic deformation. After contacting the peripheral part of the possible net member (44) (including the perforated plate), the peripheral end of the net member (44) is folded inward, and the seat frame (44a) is placed on the lower surface of the folded part (44a). 43) and a bolt (47) inserted from below the through holes (46) drilled in various places of the fastening frame (45). ) Is formed by fastening the inwardly folded portion (44a) of the net member (44) to the lower surface of the fastening frame (45) by screwing into a screw hole (48) drilled at a corresponding position on the lower surface of the fastening frame (45). Has been.

The seat frame (43) is provided with an elastic piece (50) inclined downward inward from the upper surface of the thick rigid outer periphery (49), and the thick rigid outer periphery (49). On the lower surface, a downward ridge (51) in the circumferential direction, an upward holding groove (52), and an upward pinching groove (53) are provided from the inside to the outside.
The screw hole (48) is formed from the lower surface of the downward protrusion (51).

  The fastening frame (45) has a planar outer peripheral portion (54) corresponding to the outer peripheral portion (49) of the seat frame (43), and the upper surface of the outer peripheral portion (54) has a seat frame (43) An upper protective flange (45a) that can be superposed on the outer side of the seat frame (43), and a portion corresponding to the downward protrusion (51) and the pinching groove (53) of the seat frame (43), are provided respectively. An annular concave hole (55) and an upright piece (56) that can be fitted are provided.

  The gap between the sandwiching groove (53) and the upright piece (56) is determined so that the folded portion (44a) of the net member (44) can be inserted and fastened therebetween.

  The outer peripheral edge of the net member (44) is slightly narrower than the width of the holding groove (52) in the outer peripheral portion (49) of the seat frame (43) and has an outward locking piece (57) at the lower end. In addition, a sandwiching piece (58) which is continuous or divided in the circumferential direction is fixed.

  In order to stretch the net member (44), its peripheral part is brought into contact with the upper surface and the outer surface of the outer peripheral part (49) of the seat frame (43), and then the outer end is bent inward. The sandwiching piece (58) fixed to the outer peripheral edge is inserted from below the holding groove (52).

  As a result, the outer peripheral edge of the net member (44) is retained in the holding groove (52) so that the fastening frame (52) comes into contact with the lower surface of the seat frame (43), and the bolt (47) Is inserted from below the through-hole (46) and screwed into the screw hole (48) of the seat frame (43), the clamping piece (58) is pushed by the clamping frame (45), Enter the branch groove (53).

  Therefore, the peripheral portion of the net member (44) is pulled into the lower surface of the seat frame (43), and is automatically stretched with a uniform tension in the circumferential direction and the inner and outer directions.

  Furthermore, in the embodiment, at this time, the standing piece (56) on the upper surface of the fastening frame (45) presses the peripheral portion of the net member (44), and the support groove ( 53) Since it is pushed into the net member, the tension of the net member (44) becomes larger.

It is a front view of a chair provided with the back-and-forth sliding device of the seat of one embodiment of the present invention. Similarly, it is a side view of the chair. FIG. 3 is a cross-sectional view taken along line III to III in FIG. 1. FIG. 4 is a vertical sectional view taken along the line IV-IV in FIG. 1. Similarly, it is the VV line longitudinal cross-sectional view in FIG. Similarly, it is the VI-VI line longitudinal cross-sectional view in FIG. It is a downward perspective partial enlarged view in the broken-line ellipse in FIG. It is an upper perspective exploded view of the principal part of the position adjusting device in FIG. Similarly, it is the IX-IX line longitudinal cross-sectional view in FIG. Similarly, it is an X-X line longitudinal cross-sectional view in FIG. 7, and shows a state where the engaging portion of the lever handle is engaged with the engaged portion of the guide rail. FIG. 11 is a view similar to FIG. 10, showing a state where the engagement between the engaging portion of the lever handle and the engaged portion of the guide rail is released. It is a lower perspective view which decomposes | disassembles and shows one Embodiment of the structure of a seat. Similarly, it is an enlarged vertical sectional view showing the outer end of the structure of the seat. Similarly, it is an enlarged vertical sectional view showing the outer end portion of the seat structure in an exploded manner.

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
(43) Seat frame
(44) Net member
(44a) Folding part
(45) Tightening frame
(45a) Upward protective flange
(46) Through hole
(47) Bolt
(48) Screw hole
(49) Outer periphery
(50) Elastic piece
(51) Downward protrusion
(52) Upward holding groove
(53) Upward ridge support groove
(54) Outer periphery
(55) Recessed hole
(56) Standing piece
(57) Outward locking piece
(58) Insert

Claims (6)

  By providing guide rails facing in the front-rear direction on the upper left and right of the base attached to the upper end of the pedestal in the chair, and fixing the front and rear ends with the leg seats protruding from the lower surface of the front and rear ends of the seat, A front / rear sliding apparatus for a seat in a chair, characterized in that a pair of left and right movable rails facing in the front-rear direction are provided, and the movable rails are attached to the guide rails so as to be slidable back and forth.   An upward columnar stopper is provided near the front and rear ends of the guide rail, a long slide hole is formed in the vicinity of the front and rear ends of the movable rail in the vertical direction, and the front and rear stoppers are respectively attached to the front and rear ends. The seat back-and-forth slide device according to claim 1, wherein the movable rail is attached to the guide rail so as to be slidable back and forth.   A bolt attached to the stopper provided on the guide rail from above, and the diameter of the head of this bolt is made larger than the width of the slide hole of the movable rail so that the movable rail does not come off the guide rail. The seat back-and-forth sliding device in the chair according to Item 2.   The guide rail has a U-shaped cross section, and the movable rail has a cross section with a shape in which an inverted trapezoidal fitting portion protrudes from the lower side of the quadrangle, and the fitting portion in the movable rail The seat of the chair according to claim 2 or 3, wherein the movable rail is attached to the guide rail so as to be able to slide back and forth by being fitted in a U-shaped groove of the U-shaped cross section of the guide rail. apparatus.   The front and rear sliding device for a seat in a chair according to claim 4, wherein a support piece in the front-rear direction is erected in the center of the U-shaped groove of the guide rail, and a stopper is provided in the vicinity of the front and rear ends of the support piece.   The front and rear sliding device for a seat in a chair according to any one of claims 1 to 5, wherein a sliding seat having a low sliding resistance is interposed between the guide rail and the movable rail.

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