JP2006102147A - Seat forward/backward sliding device for chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To assemble a seat sliding device in a short period of time by reducing the number of parts for attaching a lever member. <P>SOLUTION: The sliding device is for adjusting and fixing the front/rear position of the seat in a chair by the lever member 30. The lever member 30 consists of a lever grip 31 and a turning shaft 33 provided at the upper end of the lever grip facing/projecting in the front/rear direction. A seat shell 23 has a lever member attaching part 39 consisting of an opening 40 in the front/rear direction and a center bearing part 42 disposed at the center in the front/rear direction of the opening 40 to open downward. The turning shaft 33 is fitted to the center bearing part 42 from below, and the front and rear ends of the turning shaft 33 are supported on the upper surface of the seat shell 23 in the front and rear of the opening 40. At the same time, a spacer 37 for preventing the lever member 30 from moving forward/backward is fitted into respective openings in the front and rear of the center bearing part 42 and is detachably attached to the turning shaft 33. In this way, the lever member 30 is turnably attached to the seat shell 23. <P>COPYRIGHT: (C)2006,JPO&NCIPI

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 sliding device, the lever member is attached by screwing a cap, which is a member different from the movable rail, to the movable rail, so that the number of parts is large, the assembly is troublesome, and it takes time. was there.

  In view of the above-described problems, the present invention provides a seat sliding device capable of adjusting the front-rear position in a chair, which can be easily assembled in a short time with a reduced number of parts for attaching a lever member. The purpose is to do.

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 slidably fitted in the front-rear direction and at least one of the left and right seat support rods is provided with an engaged part in the front-rear direction so that the seat shell can be rotated about the front-rear direction axis. A lever member provided with an engaging portion that engages with the joint 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 elastically biased. In the front and rear sliding device of the seat in the chair that can release the engagement state by rotating against the lever, the lever member is directly or indirectly on the lever handle and the upper end of the lever handle. A rotating shaft that faces in the front-rear direction and projects forward and backward And at least one of the left and right sides of the seat shell, an opening in the front-rear direction, and a central receiving portion that is provided at the center in the front-rear direction of the opening and that opens downward to fit with the center of the pivot shaft A lever member mounting portion is provided, the rotation shaft is fitted into the center receiving portion from below, and the front and rear end portions of the rotation shaft are supported on the upper surface of the seat shell before and after the opening, and the center receiving portion The lever member is rotatably attached to the seat shell by inserting a spacer for preventing the lever member from moving back and forth in each of the front and rear opening portions and detachably attaching the spacer member to the rotary shaft.

  (2) In the above item (1), the front and rear spacers are connected by a connecting piece.

  (3) In the above item (2), the spacer is a connecting piece for connecting the two front and rear spacer portions made of a short cylindrical body facing the front and rear direction where the upper portion opens and the lower portions of the both spacer portions. It constitutes as a spacer member consisting of.

  (4) In the above item (3), a notch directed in the front-rear direction is provided on the bottom surface of the cylindrical body of the spacer portion formed of a short tubular body facing the front-rear direction in which the upper part opens.

According to the present invention, the following effects can be obtained.
According to the first aspect of the present invention, the lever member, for example, the front end portion of the rotating shaft is inserted from below the seat shell from the front portion of the opening in the lever member mounting portion, and is formed on the upper front surface of the seat shell. Next, make the pivot shaft horizontal and fit it in the center receiving part and move it slightly backward so that the rear end of the pivot shaft is supported on the upper rear surface of the seat shell, and then the center The lever member can be easily attached to the seat shell without using a screw or the like by inserting the spacer into the opening portions before and after the receiving portion and attaching the spacer to the rotating shaft. Therefore, the number of parts for attaching the lever member is small, and it is possible to easily assemble a seat sliding device capable of adjusting the front-rear position without the need for screwing or the like.
Furthermore, even when the lever member is damaged, it can be easily replaced.

  According to the invention described in claim 2, since the front and rear spacers are connected by the connecting pieces, the handling of the spacer is facilitated, and the assembly time of the seat sliding device capable of adjusting the front and rear positions is further increased. Can be shortened.

  According to the invention of claim 3, the connecting piece is gripped, and the front and rear spacers are positioned below the respective opening portions at the front and rear of the central receiving portion in the lever member mounting portion from below the seat shell. Then, by pressing the upper opening of the spacer portion against the rotating shaft, the upper opening is expanded, and the spacer member can be attached to the rotating shaft with one touch. Therefore, it is possible to further reduce the assembly time of the seat sliding device capable of adjusting the front-rear position.

  According to the fourth aspect of the present invention, when the spacer member is attached to the rotating shaft, the upper opening of the spacer portion is pressed against the rotating shaft to expand the upper opening. However, it becomes easy by the notch | incision provided in the cylinder bottom face of the spacer part, and a spacer member can be attached to a rotating shaft still more efficiently.

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 (3) having five radial rods (2) each having a caster (1) provided at the tip. . A telescopic leg column (5) having a gas spring (4) is erected at the center of the leg body (3), and a rear portion of the support base (6) is located at the upper end of the leg column (5). It is fixed.

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

  A pivot (8) consisting of a hexagonal shaft facing in the left-right direction passes through the center of the support base (6) in the front-rear direction, and both ends of the pivot (8) projecting on both sides from the support base (6) The left and right cylindrical portions 10a and 10a formed at the front end of the lower portion facing forward in the pair of left and right back support rods 10 and 10 that support the backrest 9 are shown. The pivot (8), the backrest support rod (10), (10), and the backrest (9) are fixed to each other with respect to the support base (6) around the axis of the pivot (8). Can be rotated.

  Inside the support base (6), there is a rubber torsion unit (11) (see FIG. 3) for biasing the pivot (8) in the counterclockwise direction in FIG. 2 and its biasing force adjusting means (not shown). In addition, a gas spring unit (12) is provided in the center of the lower surface of the front portion of the support base (6), which is linked to the rubber torsion unit (11) and assists the urging force of the rubber torsion unit (11). As a result, a biasing means for biasing the backrest (9) toward the standing direction is formed.

  The lower surface of the rubber torsion unit (11) is covered with a pair of left and right lower covers (13) and (13) which are 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 in the standing position and the backward tilt position, respectively.

  As shown in FIGS. 3 to 5, short upright arms (10b) and (10b) project upward from the left and right back support rods (10) and (10) slightly behind the pivot (8). The rear end of a pair of left and right seat support rods (15) and (15) that support both sides of the seat (14) is located at the upper end of each standing arm (10b). Each is connected with a shaft (16) pointing in the direction.

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

The front part of each seat support rod (15) is formed in a box shape with an open top surface and extends downward, and its lower end surface forms an inclined surface (17) inclined downward and rearward, and the inclined surface ( 17) A standing wall (18) facing the rear upper side is formed continuously to the rear end.
Each inclined surface (17) is slidably mounted in the front-rear direction on an inclined receiving surface (19) formed on the upper surface of the tip of the arm portion (6a) of the support base (6) and inclined downward. Has been.

The inclined surface (17) is separated from the inclined receiving surface (19) upward between the tip of the arm (6a) of the support base (6) and the front portion of the seat support rod (15). A stop means (20) for blocking is provided.
The retaining means (20) includes a long hole (21) facing the front-rear direction provided on the inclined surface (17) and a protrusion provided on the inclined receiving surface (19) and slidably fitted into the long hole (21). And a headed shaft (22) having an enlarged head (22a) larger than the width of the long hole (21).

  As the backrest (9) is tilted backward from the standing state, each seat support rod (15) and the seat (14) supported thereby are changed from the state shown in FIG. 4 to the state shown in FIG. Furthermore, the inclined surface (17) slides along the inclined receiving surface (19) and is 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 the 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 the front-rear direction are integrally formed at the time of molding. The recessed strip receiving portion (25) opens downward, and a plurality of horizontally-engaged pieces separated in the front-rear direction are provided at the lower end edge of the inner side surface (26) on the inner side in the left-right direction of the recessed strip receiving portion (25). (27) is provided.

  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 inner edge in the left-right direction on 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 as shown by a two-dot chain line in FIG. ) When the rear end (30) is positioned at the rear end (31) of the groove receiving portion (25), the position of the locking piece (29) and the locked piece (27) in the front-rear direction is Without overlapping, the upper portion of the seat support rod (15) can be fitted into the recess receiving portion (25), and the seat support rod (15) from the above position is recessed as shown by the solid line. If the seat shell (23) is moved forward relative to the receiving portion (25) and moved within the normal back-and-forth movement area of the seat shell (23) when the chair (100) is used, the seat shell (23) The locked piece (27) engages with the locking piece (29) of the seat support rod (15) so that the seat shell (23) does not come off from the seat support rod (15). (See FIG. 10). That is, 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 connected to the concave receiving portion. The seat (14) can be adjusted to a desired front-rear position by allowing the seat support rod (15) to slide back and forth via (25).

  The latched piece (27) and the latching piece (29), which constitute a means for preventing detachment between the concave receiving portion (25) of the seat shell (23) and the seat support rod (15), are The locking piece (27) is formed of small pieces that are smaller in length in the front-rear direction than the locking piece (29), and the locked piece (27) is provided with a plurality of these pieces separated in the front-rear direction. It is comprised by.

  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 plan view, and a lever handle (31) whose front portion is curved downward, and the lever handle (31). A vertical piece (32) that rises upward from the upper end of the rod, a pivot shaft (33) that projects forward and backward of the vertical piece (32), and a lower part of the lever handle (31) at the upper end of the vertical piece (32). The locking portion (34) extends in the opposite direction to the lever handle (31) with respect to the rotation shaft (33), and the locking portion (34) includes three parallel locking pieces (35). It is formed by.
In this embodiment, the rotation shaft (33) is provided indirectly on the upper end of the lever handle (31) via the upright piece (32), but the rotation is directly performed on the upper end of the lever handle (31). A shaft (33) may be provided.

  FIG. 14 is an enlarged top perspective view of the spacer member (36) used when the lever member (30) is attached to the seat shell (23).

  The spacer member (36) is a connecting piece for connecting the two front and rear spacer portions (37) and (37) made of a short cylindrical body facing the front-rear direction in which the upper portion is open and the lower portions of both spacer portions. (38). The connecting piece (38) has a thin plate shape in the vertical direction except for both ends.

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

  The lever member mounting portion (39) includes a front-rear receiving portion (41a) including an opening (40) in the front-rear direction provided in the seat shell (23) and an upper surface portion of the seat shell (23) before and after the opening (40). ) (41b) and a center receiving portion (42) made of a semi-cylindrical body in the front-rear direction that opens downward provided in the center portion in the front-rear direction of the opening (40).

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

First, with the lever member (30), the lever handle (31) outside in the left-right direction, for example, the front end portion (33a) of the rotating shaft (33) from the lower side of the seat shell (23), the lever member mounting portion (39) is inserted from the front of the opening (40) and supported by the front receiving part (41a) on the upper surface of the seat shell (23), and then the lever (30 ) Is moved slightly rearward, and the rear end portion (33b) of the pivot shaft (33) is supported by the rear receiving portion (41b) on the upper surface of the seat shell (23), resulting in the state shown in FIG. Next, from the lower side of the seat shell (23), the spacer member (36) is positioned with its connecting piece (38) on the outer side in the left-right direction of the lever handle (31), and the spacer portions (37) (37 ) Are inserted into the front and rear of the opening (40), respectively, and the upper opening (37a) of the spacer (37) is expanded to fit the rotating shaft (33) of the lever handle (31). By attaching it to the seat shell (23), the state shown in FIG. 17 is obtained.
In addition, an incision (37b) in the front-rear direction is provided on the bottom surface of the cylindrical portion of the spacer portion (37) made of a short cylindrical body facing in the front-rear direction, and an upper opening (37a) of the spacer portion (37) The upper opening (37a) can be easily expanded just by inserting it into the rotating shaft (33) from below, and can be fitted to the rotating shaft of the lever handle (31) with one touch. .

  By attaching the spacer member (36), the lever member (30) is prevented from moving in the front-rear direction, so that the lever member (30) is prevented from falling off from the seat shell (23) and the lever handle. (31) is pivotably and stably attached to the seat shell (23) about the pivot shaft (33).

  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. FIG. 20 is a cross-sectional view taken along the line IIX-IIX in FIG.

  As shown in FIG. 18, a plurality of engaging grooves that engage with the locking pieces (35) of the lever member (30) are formed in the central portion of the laterally outer side surface (43) of the seat support rod (15). An engagement portion (45) formed by arranging (44) in the front-rear direction is provided.

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

FIG. 18 shows that the latching piece (35) of the lever member (30) is engaged with the engagement groove (44) of the seat support rod (15) by the urging force of the coil spring (46), This shows a state where the relative movement of the seat shell (23) with respect to (15) in the front-rear direction 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), as shown in FIG. By rotating the lever handle (31) in the direction indicated by arrow F against the urging force of the spring (46), the engagement between the locking piece (35) and the engagement groove (44) is released. The seat shell (23) is movable in the front-rear direction with respect to the seat support rod (15). Next, after moving the seat (14) to the desired front-rear position, by releasing the lever handle (31), the urging force of the coil spring (46) automatically engages the locking piece (35). The engagement groove (44) engages, and the position of the seat (14) is fixed.
A two-dot chain line in FIG. 4 indicates a forward / backward movement region of the seat (14) during normal use of the chair (100).

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

  During normal use of the chair (100), the connecting piece (38) of the spacer member (36) comes into contact with the standing piece (32) of the lever member (30), and the lever handle (31) rotates. The lever handle (31) cannot rotate beyond the position 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) of 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 the seat beyond that The forward movement of (14) is restricted.

  In this state, the locking piece (29) of the seat support rod (15) and the locked piece (27) of the recessed strip receiving portion (25) of the seat shell (23) are engaged, and the seat The shell (23) does not come off from the seat support rod (15).

Thus, the stopper (47) restricts the forward / backward movement area 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 spacer member (36) is pulled downward and removed from the seat shell (23) (see FIG. 18). Next, when the lever handle (31) is rotated counterclockwise in FIG. 19, the spacer member (36) is removed, so that the lever handle (31) is rotated to the position of the imaginary line indicated by the symbol C. It becomes possible to move. When the lever handle (31) is rotated to the above position, the locking piece (35) of the lever handle (31) does not come into contact with the stopper (47), and the seat shell (23) of the stopper (47) The restriction of forward / backward movement is released.

  Therefore, as shown by a two-dot chain line in FIG. 9, the seat shell (23) is substantially in contact with the rear end of the recess receiving portion (25) of the seat shell (23). It is possible to move forward to the contact position. When the seat shell (23) is moved to the above position, the engagement between the latched piece (27) of the concave receiving portion (25) and the latch piece (29) of the seat support rod (15) is released. In order to be able to release the fitting between the recess receiving part (25) and the seat support rod (15), the seat shell (23) can be lifted upward and easily removed from the seat support rod (15). Can do.

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 spacer member. 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

(100) Chair
(1) Casters
(2) Legs
(3) Leg
(4) Gas spring
(5) Pillar
(6) Support base
(6a) Arm
(7) Top cover
(8) Axis
(9) Backrest
(10) Back support
(10a) Tube part
(10b) Standing arm
(11) Rubber torsion unit (biasing means)
(12) Gas spring unit (biasing means)
(13) Bottom cover
(14) Seat
(15) Seat support rod
(16) axis
(17) Inclined surface
(18) Standing wall
(19) Inclined bearing surface
(20) Stop prevention means
(21) Long hole
(22) Headed shaft
(22a) Expanded head
(23) seat shell
(24) Skin material
(25) Recess receiving part
(26) Inner side
(27) Locked piece
(28) Upper surface
(29) Locking piece
(30) Lever member
(31) Lever handle
(32) Standing piece
(33) Rotating shaft
(33a) Front end
(33b) Rear end
(34) Locking part
(35) Locking piece
(36) Spacer member
(37) Spacer
(37a) Upper opening
(37b) Notch
(38) Connecting piece
(39) Lever member mounting part
(40) Opening
(41a) Front receiving part
(41b) Rear receiving part
(42) Central receiving part
(43) Side
(44) Engagement groove
(45) Engagement part
(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. The slidably fitted and at least one of the left and right seat support rods is provided with an engaged portion in the front-rear direction, and the seat shell can be rotated about an axis in the front-rear direction. A lever member provided with an engaging portion to be engaged is attached, and this lever member is elastically biased in a direction in which the engaging portion and the engaged portion are engaged, and the lever member is resisted against elastic biasing. In the front and rear sliding device of the seat in the chair that can be released from the engaged state by rotating the
The lever member is composed of a lever handle, and a pivot shaft that protrudes forward and backward, which is directly or indirectly provided at the upper end of the lever handle, and is provided on at least one of the left and right sides of the seat shell. Provided with a lever member mounting portion comprising a central opening portion and a downwardly opening central receiving portion that is fitted to the central portion of the rotational shaft, provided at the central portion of the opening in the front-rear direction. The center receiving portion is fitted from below, the front and rear end portions of the rotating shaft are supported on the upper surface of the seat shell before and after the opening, and the lever member is moved back and forth in each opening portion before and after the central receiving portion. A seat back-and-forth sliding device in a chair, wherein a lever member is rotatably attached to a seat shell by inserting a spacer to prevent it and detachably attaching it to a rotating shaft.   The seat front / rear sliding device according to claim 1, wherein the front and rear spacers are connected by a connecting piece.   The spacer is configured as a spacer member comprising two front and rear spacer parts made of a short cylindrical body facing the front and rear direction in which the upper part opens and a connecting piece that connects the lower parts of both spacer parts. The front and rear sliding device for a seat in a chair according to claim 2.   4. The seat front / rear sliding device according to claim 3, wherein a notch facing in the front-rear direction is provided on the bottom surface of the cylindrical portion of the spacer portion formed of a short tubular body facing in the front-rear direction in which the upper part opens.

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