JP4695165B2 - 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.

As this type of conventional front and rear sliding device, guide rails are provided in the front and rear directions on the left and right sides of the support base in the chair, and movable rails provided on the left and right sides of the seat are attached to the guide rails so that they can slide back and forth. In addition, at least one of the left and right guide rails is provided with an engaged portion along the longitudinal direction, and the seat is provided with an engaging portion that is rotatable about an axis in the front-rear direction and engages with the engaged portion. The lever member is attached and elastically biased in the direction in which the engaging portion and the engaged portion are engaged, and the lever member is rotated against the elastic biasing to The applicant of the present application has proposed that the combined state can be canceled (Patent Document 1).
JP 2004-49655 A

  However, in the above-described seat back-and-forth slide device in the chair, the restriction of the seat back-and-forth movement area relative to the guide rail is controlled by a shaft protruding upward from the upper surface of the guide rail, and the front and rear grooves provided on the movable rail. Since it is controlled by abutting against the end and the upward movement of the movable rail relative to the guide rail is prevented by screwing the head screw into the upper surface of the shaft, the number of parts is large, and assembly and maintenance In addition, there is a problem that the disassembly for disposal is troublesome and takes time.

  In view of the above-described problems, the present invention can reliably restrict the rotation of the lever member, can easily release the restriction of the rotation of the lever member, and can easily reduce the number of parts. It is an object of the present invention to provide a seat back-and-forth slide device that can be assembled in time and can be easily disassembled for maintenance and disposal.

The above-described problems are solved by the invention having the following configuration, as shown in each of the claims.
(1) Seat support rods facing in the front-rear direction are provided on the left and right sides of the base attached to the upper end of the pedestal in the chair, and the receiving portions provided on the lower side of the seat shell or on the left and right sides on the seat support rod are provided. The engagement portion is slidably fitted in the front-rear direction, and an engagement portion in the front-rear direction is provided on at least one of the left and right seat support rods, and the engagement portion can be rotated around the axis in the front-rear direction. A lever member provided with a locking portion to be engaged is attached, and the lever member is elastically biased in a direction in which the locking portion and the engaging portion engage with each other, and the lever member is resisted against the elastic biasing. In the front and rear sliding device of the chair in which the engagement state can be released by rotating the lever, the lever member is provided directly or indirectly on the lever handle and the upper end of the lever handle. And a rotating shaft facing in the front-rear direction. At least one of the left and right sides is provided with a lever member mounting portion that includes a front-rear opening and a shaft fitting receiving portion that is provided in the opening and opens downward to fit the rotation shaft. In order to fit the moving shaft to the shaft fitting receiving portion from below, and to support the front and rear end portions of the rotating shaft on the upper surface of the seat shell located before and after the opening, and to prevent the lever member from moving back and forth. The spacer part is fitted to the rotating shaft and is detachably attached.

(2) In the above item (1), the spacer is composed of a short cylindrical body facing in the front-rear direction where the upper part opens, and the upper opening is expanded and fitted to the rotating shaft from below. Make it possible.

(3) In the above item (1) or (2), the shaft fitting receiving portion is provided at the center in the front-rear direction in the front-rear opening provided in the seat shell, and the lever member is provided in the shaft fitting receiving portion. The rotation shaft is fitted from below, the front and rear end portions of the rotation shaft are supported on the upper surface of the seat shell, and the front and rear openings of the shaft fitting receiving portion are short in the front-back direction. The spacer part which consists of a small cylinder is fitted, and also the lower parts of these spacer parts are connected with a connecting piece.

(4) In the above item (2) or (3), a notch facing in the front-rear direction is provided on the bottom surface of the cylindrical portion of the spacer.

According to the present invention, the following effects can be obtained.
According to the first aspect of the present invention, when the seat is assembled to be slidable back and forth on the left and right seat support rods of the support base attached to the upper end of the pedestal, the spacer is provided to prevent the lever member from moving back and forth. By simply attaching the part to the seat shell, it can be easily assembled in a short time and the number of parts can be reduced.
Further, since the spacer portion is detachably attached by fitting to the rotation shaft located at the opening of the lever member attaching portion, the lever member can be prevented from moving back and forth.
Also, when disassembling the chair by separating the seat from the seat support rod for maintenance or disposal, it is easy to remove the spacer from the seat shell and move the seat to remove the seat from the seat support rod. Can be separated.

  According to the second aspect of the present invention, the spacer portion is composed of a short cylindrical body facing in the front-rear direction in which the upper portion opens, and the upper opening is expanded so as to be fitted to the rotating shaft from below. As a result, the spacer can be attached to the rotating shaft with a single touch.

  According to the third aspect of the present invention, since the lower portions of the spacer portions are connected to each other by the connecting pieces, the connecting pieces are gripped and the front and rear spacer portions are respectively connected to the levers from below the seat shell. By positioning the upper part opening of the spacer part against the rotating shaft by positioning it below the respective openings before and after the receiving part in the member attaching part, the spacer part can be attached to the rotating shaft with one touch, Similarly, the front and rear spacers can be easily removed simply by holding the connecting piece and pulling it downward.

  According to the fourth aspect of the present invention, when the spacer is attached to the rotating shaft, the upper opening of the spacer is pressed against the rotating shaft to expand the upper opening. However, since it becomes easy by the notch | incision provided in the cylinder bottom surface of the spacer part, a spacer part can be easily attached to a rotating shaft by one touch.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
1 to 3 are a front view, a side view, and an exploded perspective view of a chair provided with the front and rear sliding device of the present invention, respectively.

As shown in FIGS. 1 to 3, the chair 100 includes a leg body 3 having five leg rods 2 having a radial shape with a caster 1 provided at a tip portion.
In the center of the leg 3, a telescopic leg column 5 having a gas spring 4 is erected, and the rear part of the support base 6 is fixed to the upper end of the leg column 5.

The support base 6 has a substantially hollow box shape with a rhombus in plan view in which the upper surface of the front half is open, and the opening on the upper surface is covered with a removable upper cover 7.
On both side surfaces of the front portion of the support base 6, arm portions 6a extending in the left and right sides are integrally formed.

  A pivot 8 made of a hexagonal shaft facing in the left-right direction passes through substantially the center in the front-rear direction of the support base 6, and a backrest 9 is supported at both ends of the pivot 8 protruding from the support base 6 on both sides. A pair of left and right backrest support rods 10 and 10 is formed with a cylindrical portion 10a and 10a facing in the left and right direction formed at the front end portion of the lower portion facing forward, and the pivot 8 and the backrest support rods 10 and 10 and the back. The drooping 9 is configured to be rotatable with respect to the support base 6 integrally with each other around the axis of the pivot 8.

  Inside the support base 6 is a rubber torsion unit 11 (see FIG. 3) for biasing the pivot 8 counterclockwise in FIG. 2 and its biasing force adjusting means (not shown). In the center of the lower surface of the front portion, there are provided gas spring units 12 that are linked to the rubber torsion unit 11 and assist the urging force of the rubber torsion unit 11, respectively, so that the backrest 9 is attached in the direction to stand up. A biasing means for biasing is formed.

  The lower surface of the rubber torsion unit 11 is covered with a pair of left and right lower covers 13, 13 detachably provided on the lower surface of the support base 6.

  4 and 5 are enlarged side views of the main part when the backrest 9 is set to the standing position and the backward tilt position, respectively.

  As shown in FIGS. 3 to 5, short standing arms 10 b and 10 b are provided to protrude slightly upward from the pivot 8 in the left and right backrest supporting rods 10 and 10, and each standing arm 10 b The rear ends 15a of a pair of left and right seat support rods 15 and 15 that support both sides of the seat 14 are coupled to the upper end of the seat 14 with a shaft 16 that faces the left and right directions.

  6 and 7 are respectively an enlarged view of the lower side of the seat support rod 15 and an enlarged perspective view of the lower side of the seat.

The front portion of each seat support rod 15 is formed in a box shape with an open top surface, and extends downward. The lower end surface of the seat support rod 15 forms an inclined surface 17 that is inclined rearward and downward. Continuously, an upright wall 18 facing rearward and upward is formed.
Each inclined surface 17 is slidably mounted in the front-rear direction on an inclined receiving surface 19 which is formed on the upper surface of the distal end portion of the arm portion 6a of the support base 6 and is inclined downward.

Between the front end portion of the arm portion 6a of the support base 6 and the front portion of the seat support rod 15, there is provided a locking means 20 for preventing the inclined surface 17 from separating upward from the inclined receiving surface 19. Yes.
The detachment preventing means 20 is provided with a long hole 21 provided in the inclined surface 17 facing in the front-rear direction, a protrusion provided on the inclined receiving surface 19 and slidably fitted in the long hole 21, and the width of the long hole 21. And a headed shaft 22 having a larger enlarged head 22a.

  In conjunction with the backrest 9 being tilted backward from the standing state, the seat support rods 15 and the seats 14 supported by the seat support rods 15 have the inclined surfaces 17 from the state shown in FIG. 4 as shown in FIG. While sliding along the inclined receiving surface 19, it can be moved rearward and downward.

  As shown in FIG. 4, the seat 14 is configured by stretching a skin material 24 made of a net member or the like on the upper surface of the seat shell 23.

  FIG. 8 is a lower enlarged perspective view of a main part of the seat 14 before assembly.

The seat shell 23 is generally formed of a synthetic resin, and on the left and right sides of the lower surface thereof, concave and long receiving portions 25 facing in the front-rear direction are integrally formed at the time of molding.
The concave receiving portion 25 opens downward, and a plurality of horizontally engaged pieces 27 are provided at the lower end edge of the inner side surface 26 on the inner side in the left-right direction of the concave receiving portion 25 so as to be separated in the front-rear direction. .

  On the other hand, as shown in FIG. 7, the seat support rod 15 is provided with horizontal locking pieces 29 before and after the left and right inner edges of the upper surface 28.

  9 is a cross-sectional view taken along the line IX-IX in FIG. 4, and FIG. 10 is a cross-sectional view taken along the line X-X in FIG.

The positional relationship between the locking piece 29 of the seat support rod 15 and the locked piece 27 of the seat shell 23 is such that the rear end 15a of the seat support rod 15 is received by a concave strip as shown by a two-dot chain line in FIG. When positioned at the rear end 25 a of the portion 25, the position of the locking piece 29 and the locked piece 27 in the front-rear direction does not overlap, and the upper portion of the seat support rod 15 is placed in the recessed strip receiving portion 25. The seat support rod 15 can be moved from the above position relative to the concave receiving portion 25 as indicated by a solid line, and the seat shell 23 is normally used when the chair 100 is used. In the case where the seat shell 23 is moved in the forward / backward movement region, the latched piece 27 of the seat shell 23 engages with the latch piece 29 of the seat support rod 15, and the seat shell 23 is disengaged upward from the seat support rod 15. (See FIG. 10).

That is, only when the concave receiving portion 25 is moved to one of the front and rear beyond the normal forward / backward movement region with respect to the seat supporting rod 15, the concave receiving portion 25 together with the seat shell 23 is supported by the seat supporting rod. 15 can be attached and detached.
Further, the concave receiving portion 25 is formed longer in the front-rear direction than the seat support rod 15, and when the chair 100 is used, the seat shell 23 is inserted into the seat supporting rod 25 via the concave receiving portion 25. By making it possible to slide back and forth with respect to 15, the seat 14 can be adjusted to a desired front and back position.

  The latched piece 27 and the latching piece 29 constituting the slip-off preventing means between the concave receiving portion 25 and the seat support rod 15 in the seat shell 23 are the latched piece 27 and the latching piece 29. Rather, it is formed of small pieces having a smaller length in the front-rear direction, and the locked piece 27 is configured by providing a plurality of these small pieces apart from each other in the front-rear direction.

  Further, a lever member 30 is provided to fix the seat 14 at a desired front and rear position.

  11, 12, and 13 are an enlarged upper perspective view, a lower perspective view, and a side view of the lever member 30, respectively.

  As shown in FIGS. 11 to 13, the lever member 30 has a flat semicircular shape in a plan view, and a lever handle 31 whose front portion is bent downward, and stands upward from the upper end of the lever handle 31. The upright piece 32, the upper end of the upright piece 32, the rotating shaft 33 protruding forward and backward of the upright piece 32, and the lever shaft 31 below the lever handle 31 extend in the opposite direction to the lever handle 31. The engaging portion 34 is formed by three parallel locking pieces 35.

  In the present embodiment, the rotation shaft 33 is provided indirectly on the upper end of the lever handle 31 via the standing piece 32, but the rotation shaft 33 may be provided directly on the upper end of the lever handle 31.

  FIG. 14 is an enlarged top perspective view of the rotation restricting means 36 used when the lever member 30 is attached to the seat shell 23.

The rotation restricting means 36 includes two front and rear spacer portions 37, 37 made of a short cylindrical body facing the front-rear direction in which the upper portion opens, and a connecting piece 38 that connects the lower portions of the both spacer portions. Has been.
The connecting piece 38 has a thin plate shape in the vertical direction except for both ends.

  FIG. 15 is an enlarged upper perspective view of the lever member mounting portion 39 in the seat shell 23 (circle A portion in FIG. 3).

  The lever member mounting portion 39 includes a front-rear direction opening 40 provided in the seat shell 23, front-rear receiving portions 1 a, 41 b including upper surface portions of the seat shell 23 before and after the opening 40, and a front-rear direction within the opening 40. It is comprised from the shaft fitting receiving part 42 which consists of a semi-cylindrical body of the front-back direction provided in the center part and opening downward.

  16 and 17 are enlarged upper perspective views showing a procedure for attaching the lever member 30 to the seat shell 23.

  First, the lever member 30 is inserted with the lever handle 31 outward in the left-right direction, and for example, the front end portion 33a of the rotation shaft 33 is inserted from below the seat shell 23 through the front portion of the opening 40 in the lever member mounting portion 39. The support member 41a on the upper surface of the seat shell 23 is supported on the upper surface of the seat shell 23, the lever shaft 30 is moved slightly rearward with the pivot shaft 33 in a horizontal state, and the rear end portion 33b of the pivot shaft 33 is moved to the seat shell. 16 is supported by the rear bearing portion 41b on the upper surface of 23, and the state shown in FIG.

Next, from the lower side of the seat shell 23, the rotation restricting means 36 is positioned with the connecting piece 38 outside the lever handle 31 in the left-right direction, and the spacer portions 37, 37 are respectively connected to the front portion of the opening 40, By fitting into the rear portion, the upper opening 37a of the spacer portion 37 is expanded and fitted to the rotating shaft 33 of the lever handle 31, it is attached to the seat shell 23 and brought into the state shown in FIG.

  Note that a notch 37b in the front-rear direction is provided on the bottom surface of the cylindrical portion 37 of the spacer portion 37 made of a short cylindrical body facing in the front-rear direction. The upper opening 37a is easily expanded just by being inserted into the lever 33, and can be fitted to the rotating shaft 33 of the lever handle 31 with one touch.

  By attaching the rotation restricting means 36, the movement of the lever member 30 in the front-rear direction is prevented, so that the lever member 30 is prevented from falling off from the seat shell 23, and the lever handle 31 is attached to the rotation shaft 33. As a pivot, it is stably attached to the seat shell 23 so as to be rotatable.

  18 is an enlarged perspective view of the lower part of the main part of the seat shell 23 in which the seat support rod 15 and the lever member 30 are assembled, FIG. 19 is a sectional view taken along line XIX to XIX in FIG. 4, and FIG. 20 is IIX in FIG. FIG.

  As shown in FIG. 18, a plurality of engaging grooves 44 that engage with the locking pieces 35 of the lever member 30 are arranged in the front-rear direction at the center of the side surface 43 on the outer side in the left-right direction of the seat support rod 15. An engagement portion 45 formed in this manner is provided.

  As shown in FIG. 19, the lever handle 31 is biased inward in the left-right direction by a coil spring 46 having one end attached to the back surface of the lever handle 31 and the other end attached to the seat shell 23.

  In FIG. 18, the latching piece 35 of the lever member 30 is engaged with the engagement groove 44 of the seat support rod 15 by the biasing force of the coil spring 46, and the seat shell 23 is relative to the seat support rod 15 in the front-rear direction. This shows the state in which automatic movement is restricted.

In order to adjust the position of the seat 14 in the front-rear direction by moving the seat shell 23 from this state, the hand is placed on the lower surface of the lever handle 31 and the biasing force of the coil spring 46 is applied as shown in FIG. On the other hand, by rotating the lever handle 31 in the direction indicated by the arrow F, the engagement between the locking piece 35 and the engagement groove 44 is released, and the seat shell 23 is moved relative to the seat support rod 15. It is movable in the front-rear direction.

Next, after the seat 14 is moved to a desired front-rear position, the lever 35 is released, and the engaging piece 35 and the engaging groove 44 are automatically engaged by the urging force of the coil spring 46. The position of the seat 14 is fixed.

  A two-dot chain line in FIG. 4 indicates a region in which the seat 14 moves back and forth during normal use of the chair 100.

  A position A of the lever handle 31 indicated by a solid line in FIG. 19 indicates a state in which the locking piece 35 of the lever handle 31 and the engaging groove 44 of the seat support rod 15 are engaged, and the lever indicated by a two-dot chain line. A position B of the handle 31 indicates a state where the engagement is released.

  During normal use of the chair 100, the connecting piece 38 of the rotation restricting means 36 abuts on the standing piece 32 of the lever member 30, and the rotation of the lever handle 31 is restricted. It cannot be rotated beyond B.

  On the other hand, as shown in FIGS. 6 and 18, a stopper 47 is provided at the front portion of the engagement portion 45 in the seat support rod 15 toward the outside in the left-right direction.

  When the lever handle 31 is in the position B and the seat 14 is moved forward, the locking piece 35 of the lever handle 31 comes into contact with the stopper 47, and further forward movement of the seat 14 is restricted. .

  In this state, the locking piece 29 of the seat support rod 15 is engaged with the locked piece 27 of the concave receiving portion 25 in the seat shell 23, so that the seat shell 23 is detached from the seat support rod 15. There is nothing.

  As described above, the stopper 47 regulates the forward / backward movement region of the seat shell 23 during normal use of the chair.

In order to cancel the restriction by the stopper 47, the following may be performed.
First, the rotation restricting means 36 is pulled downward and removed from the seat shell 23 (see FIG. 18).

Next, when the lever handle 31 is rotated in the counterclockwise direction in FIG. 19, the rotation restricting means 36 is removed, so that the lever handle 31 can be rotated to the position of the imaginary line indicated by C.

When the lever handle 31 is rotated to the position, the locking piece 35 in the lever handle 31 does not come into contact with the stopper 47, and the restriction of the back and forth movement of the seat shell 23 by the stopper 47 is released.
Therefore, the seat shell 23 is moved forward to a position where the rear end 15a of the seat support rod 15 substantially comes into contact with the rear end 25a of the concave strip receiving portion 25 in the seat shell 23 as shown by a two-dot chain line in FIG. It becomes possible to make it.

When the seat shell 23 is moved to the above position, the engagement between the latched piece 27 of the concave strip receiving portion 25 and the latch piece 29 of the seat support rod 15 is released, and the concave strip receiving portion 25 and the seat support rod are disengaged. 15 so that the seat shell 23 can be lifted upward and removed from the seat support rod 15 easily.

It is a front view of a chair provided with the back-and-forth sliding device of the present invention. Similarly, it is a side view. Similarly, it is an exploded perspective view. It is an enlarged side view of the principal part when a backrest is made into an upright position. Similarly, it is an enlarged side view of the main part when the backrest is set to the rearward tilt position. It is an outer side downward enlarged perspective view of the seat support rod in the left-right direction. Similarly, it is an inner bottom view enlarged perspective view of the seat support rod in the left-right direction. It is a downward expansion perspective view of the principal part of the seat before an assembly. It is the IX-IX sectional view taken on the line in FIG. FIG. 10 is a cross-sectional view taken along line X-X in FIG. 9. It is an expansion upper perspective view of a lever member. Similarly, it is an expansion downward perspective view of a lever member. Similarly, it is an enlarged side view of a lever member. It is an expansion upper perspective view of a rotation control means. It is an expansion upper perspective view of the lever member attaching part in a seat shell. It is an expansion upper perspective view which shows the procedure which attaches a lever member to a seat shell. Similarly, it is an enlarged upper perspective view showing a procedure for attaching the lever member to the seat shell. It is a downward expansion perspective view of the principal part of the seat after an assembly. It is the XIX-XIX sectional view taken on the line in FIG. It is the IIX-IIX sectional view taken on the line in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Chair 1 Caster 2 Leg rod 3 Leg body 4 Gas spring 5 Pillar 6 Support base 6a Arm part 7 Upper cover 8 Axis 9 Backrest 10 Backrest support collar 10a Tube part 10b Standing arm 11 Rubber torsion unit (biasing means)
12 Gas spring unit (biasing means)
13 Lower cover 14 Seat 15 Seat support rod 15a Rear end 16 Shaft 17 Inclined surface 18 Standing wall 19 Inclined receiving surface 20 Detachment means 21 Long hole 22 Headed shaft 22a Expanded head 23 Seat shell 24 Skin material 25 Concave receiving portion 25a Rear end 26 Inner side surface 27 Locked piece 28 Upper surface 29 Locking piece 30 Lever member 31 Lever handle 32 Standing piece 33 Rotating shaft 33a Front end portion 33b Rear end portion 34 Locking portion 35 Locking piece 36 Rotation restricting means 37 Spacer portion 37a Upper opening 37b Notch 38 Connecting piece 39 Lever member mounting portion 40 Opening 41a Front bearing portion 41b Rear bearing portion 42 Shaft fitting receiving portion 43 Side surface 44 Engaging groove 45 Engaging portion 46 Coil spring 47 Stopper

Claims (4)

Seat support rods facing in the front-rear direction are provided on the left and right sides of the base attached to the upper end of the pedestal in the chair, and the receiving portions provided on the left and right sides below or below the seat shell on the seat support rods in the front-rear direction. In addition to being slidably fitted, at least one of the left and right seat support rods is provided with an engagement portion in the front-rear direction, and the seat shell can be rotated about the axis in the front-rear direction and engaged with the engagement portion. A lever member provided with a locking portion is attached, and the lever member is elastically biased in a direction in which the locking portion and the engaging portion are engaged, and the lever member is rotated against the elastic biasing. In the seat front and rear sliding device in which the engagement state can be released by
The lever member is composed of a lever handle and a pivot shaft that is provided directly or indirectly at the upper end of the lever handle and faces in the front-rear direction. Provided in the opening is a lever member mounting portion that includes a shaft fitting receiving portion that opens downward and fits with the rotating shaft, and fits the rotating shaft to the shaft fitting receiving portion from below. The front and rear end portions of the pivot shaft are supported on the upper surface of the seat shell positioned before and after the opening, and the spacer portion for preventing the lever member from moving back and forth is fitted to the pivot shaft. Then, the back-and-forth sliding device for the seat in the chair, which is detachably attached.   The chair according to claim 1, wherein the spacer portion is formed of a short cylindrical body facing in the front-rear direction in which the upper portion opens, and the upper opening is expanded so as to be fitted to the rotating shaft from below. Back and forth sliding device.   The shaft fitting receiving portion is provided at the center portion in the front-rear direction in the opening in the front-rear direction provided in the seat shell, and the turning shaft of the lever member is fitted to the shaft fitting receiving portion from below, and the turning The front and rear ends of the shaft are supported on the upper surface of the seat shell, and the front and rear openings of the shaft fitting receiving portion are fitted with a spacer portion made of a short cylindrical body facing the front and rear direction where the upper portion opens, and The seat back-and-forth sliding device for a chair according to claim 1 or 2, wherein the lower portions of both spacers are connected by connecting pieces.   The seat back-and-forth sliding device for a chair according to claim 2 or 3, wherein a notch facing in the front-rear direction is provided on the bottom surface of the cylindrical portion of the spacer portion.

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