JP4456453B2 - 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 conventional front and rear sliding device of this type is provided with a guide rail facing in the front-rear direction on the left and right upper sides of the support base attached to the upper end of the pedestal. The applicant of the present application has proposed that the movable rail provided is attached so as to be slidable back and forth (Patent Document 1).
JP 2004-49654 A

  However, in the above-described front and rear sliding device, a movable rail separate from the seat shell is attached to the left and right lower sides of the seat shell with the front and rear screws, and the guide rail and the movable rail are prevented from coming off. There is a problem in that the number of parts is large because it is necessary to carry out the assembly, and it takes time to assemble.

  In view of the above problems, an object of the present invention is to provide a back-and-forth slide device for a seat in a chair that has a small number of parts, can be easily assembled in a short time, and is advantageous in terms of cost.

The above-described problems are solved by the invention having the following configuration, as shown in each of the claims.
(1) to the left and right above the support base attached to the upper end of the pedestal in a chair, provided a seat support rod facing the front-rear direction, the upper portion of the seat support rod, the right and left underside of the seat shell, in the molding of the seat shell A plurality of locking pieces projecting in the left-right direction are fitted on at least one of the left and right sides of the seat support rod , and the integrally formed concave opening receiving portion that opens downward is slidably fitted in the front-rear direction. It is provided at a distance from the front and the rear, and the recess receiving part is positioned below the locking piece in the longitudinal movement area of the seat shell when the chair is used, and is disengaged from the seat support rod to the upper side of the seat shell. When the seat shell is moved beyond the forward / backward movement region, the seat support rod is disengaged from the position below the locking piece, and the seat support rod is allowed to disengage upward from the seat shell. Multiple locked pieces that can be Provided by said locking piece and the locking piece, constituting the latch means of the fitting.

(2) In the above item (1) , the latched pieces in the recess receiving portion are formed with small pieces having a length in the front-rear direction smaller than the latch pieces in the seat support rod, and these small pieces are separated in the front-rear direction. Multiple.

(3) In the above item (1) or (2) , the engagement of the locking piece of the seat support rod and the locked piece of the recess receiving portion within the forward / backward movement region of the seat shell when the chair is used In addition to providing a restricting means for preventing the disengagement, the restricting means can be released.

According to the present invention, the following effects can be obtained.
According to the first aspect of the present invention, since the groove receiving portion formed integrally when the seat shell is molded functions as a guide groove for the seat support rod, a separate movable rail as in Patent Document 1 is unnecessary. In addition, a screw for attaching it is also unnecessary, and the number of parts is reduced.
Further, since it is not necessary to screw the movable rail and it can be easily assembled in a short time, it is possible to save labor and is advantageous in terms of cost.

Further, since the locking means can be integrally formed with the seat shell and the seat support rod when molding, it requires less work and costs compared to the case where a locking means is provided separately. Is also advantageous.
In addition, since the seat shell can be easily detached from the seat support rod, maintenance is easy.

According to the second aspect of the present invention, since it is formed with a small piece smaller than the locking piece, the opening for die removal at the time of molding the seat shell can be reduced, and the strength of the seat shell is prevented from being lowered. In addition, since a plurality of pieces to be locked are provided apart from each other in the front-rear direction, the means for preventing the fitting between the concave receiving portion of the seat shell and the seat support rod is provided in the seat when the chair is used. It can be easily formed over the entire length of the forward / backward movement region of the shell.

According to the invention described in claim 3 , when the chair is used, the seat shell can be safely moved back and forth to adjust the seat to a desired position, and the restriction means is released as necessary. The seat shell and the seat support rod can be easily separated and used for maintenance, for example.

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 portion (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) provided on the inclined surface (17) facing in the front-rear direction 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 horizontal 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.

  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 Inserted from the front part of the opening (40) in (39) and supported by the front receiving part (41a), then moved the lever member (30) slightly backward with the rotating shaft (33) in a horizontal state. The rear end portion (33b) of the rotating shaft (33) is supported by the rear receiving portion (41b), and the state shown in FIG. 16 is obtained. 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.

  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.

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), so that the seat support rod This shows a state where the relative movement of the seat shell (23) with respect to (15) in the front-rear direction is restricted. From this state, to move the seat shell (23) and adjust the position of the seat (14) in the front-rear direction, 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 front / rear 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) abuts against 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) 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 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. Since the fitting between the recess receiving part (25) and the seat support rod (15) can be released, the seat shell (23) can be lifted and easily removed from the seat support rod (15). .

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.

(100) Chair
(1) Casters
(2) Legs
(3) Leg
(4) Gas spring
(5) pedestal
(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
(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 (3)

The left and right above the support base attached to the upper end of the pedestal in a chair, provided a seat support rod facing the front-rear direction, the upper portion of the seat support rod, the right and left underside of the seat shell, integrally during the molding of the seat shell The formed recess receiving portion that opens downward is slidably fitted in the front-rear direction, and a plurality of locking pieces projecting in the left-right direction are separated from each other on at least one of the left and right sides of the seat support rod. In addition, it is provided on the concave receiving portion, and is positioned below the locking piece in the forward / backward movement region of the seat shell when the chair is used to prevent the seat shell from coming off the seat shell. At the same time, when the seat shell is moved beyond the forward / backward movement region, the seat support rod is disengaged from the position below the locking piece, and the seat shell can be allowed to disengage upward from the seat shell. A plurality of locked pieces , The engagement by the locking piece and the locking piece, before and after the sliding device of the seat in the chair, characterized by being configured to anti-removal means of said fitting. The locked piece in the concave receiving portion is formed with small pieces having a length in the front-rear direction smaller than the locking piece in the seat support rod, and a plurality of these small pieces are provided apart in the front-rear direction. The seat back-and-forth sliding device in the chair according to Item 1 . In the region where the seat shell is moved back and forth during use of the chair, a restricting means is provided to prevent the engagement between the locking piece of the seat support rod and the locked piece of the concave receiving portion, The seat back-and-forth sliding device for a chair according to claim 1 or 2, wherein the restricting means can be released.

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