JP4491317B2 - Chair seat structure - Google Patents

Description

  The present invention relates to a seat structure of a chair in which a net or a porous sheet skin material is stretched on the upper surface of a seat frame.

In a chair with a net-like skin material stretched on the upper surface of the seat frame, a guide rail facing in the front-rear direction is provided on the left and right upper sides of the base attached to the upper end of the pedestal, and this guide rail is provided on the lower left and right sides of the seat. Patent Documents relating to the applicant of the present application have disclosed movable rails that are provided apart from a seat so as to be slidable back and forth (Patent Document 1).
JP 2004-49654 A

  However, in the above-mentioned chair, it is necessary to attach a movable rail separate from the seat with the front and rear screws to the left and right lower sides of the seat, and also to prevent the guide rail and the movable rail from coming off. For this reason, there is a problem that the number of parts is large, the assembly is troublesome and requires a lot of work.

  In view of the above-described problems, the present invention provides a seat structure for a chair having a seat frame that has a small number of parts, can be easily assembled in a short time, has good sitting comfort, and has sufficient strength. For the purpose.

The above-described problems are solved by the invention having the following configuration, as shown in each of the claims.
(1) In a chair seat structure in which a net or a porous sheet skin is stretched on the upper surface of the seat frame, the left and right members of the seat frame are inclined downward from the outer edge in the left-right direction toward the inner edge. And a recess receiving portion that is slidably fitted back and forth on seat support rods facing in the front-rear direction provided on the left and right sides of the support base attached to the upper end of the pedestal. The inner side surface in the left-right direction of the concave receiving portion that is formed integrally with the seat frame and opens downward is an upstanding surface that rises upward from the lower surface of the seat frame, and in the concave receiving portion. The outer side surface on the outer side in the left-right direction is formed by the inner side surface of the ridge facing in the front-rear direction depending from the lower surface of the seat frame .

  (2) In the above item (1), the front and rear members of the seat frame are formed so as to be inclined downward from the outer edge in the front and rear direction toward the inner edge.

  (3) In the above item (1) or (2), the front and rear members of the seat frame are provided with upward or downward ribs in the left-right direction.

  (4) In the above item (3), upward or downward ribs on the front and rear members are provided on the inner end edges of the front and rear members over the entire length thereof.

(5) In any one of the above items (1) to (4) , a disengagement preventing means for preventing disengagement between the seat support rod and the concave receiving portion is provided.

(6) In the above item (5) , the locking means is provided on at least one of the left and right sides of each seat support rod, with locking pieces protruding in the left-right direction, separated in the front-rear direction, Engagement that is located below the locking piece and is separated from the seat support rod in the front-rear movement region when the chair is used, so as to prevent the recess receiving part from coming off upward. Provide a stop.

According to the present invention, the following effects can be obtained.
According to the first aspect of the present invention, since the concave receiving portion formed integrally when the seat frame is formed functions as a guide groove of 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, it is not necessary to screw the movable rail, and it can be easily assembled in a short time due to labor saving.
Further, since the left and right members of the seat frame are formed so as to be inclined downward from the outer edge in the left and right direction toward the inner edge, the net or the porous sheet skin material stretched on the upper surface of the seat frame When sitting on the top, even if the skin material extends due to the weight and falls downward, the buttocks do not hit the inner edge of the seat frame, etc., and the seating comfort is good, and the seat frame itself is also vertically The load bearing strength is improved.
In addition, by making the receiving portion a concave receiving portion in the front-rear direction that opens downward, the receiving portion that fits with the seat support rod and can slide in the front-rear direction can be easily integrated when forming the seat frame. In addition, by forming such a concave receiving portion, the strength of the left and right members can be improved, and the load bearing strength of the seat frame can be increased.

  According to the second aspect of the present invention, the front and rear members of the seat frame together with the left and right members are inclined downward from the outer end edge toward the inner end edge. The seating comfort is further improved, and the load bearing strength of the seat frame is further improved.

  According to the third aspect of the present invention, since the front and rear members of the seat frame are provided with the ribs in the left and right direction, the seat frame is combined with the reinforcing effect by the concave receiving portions provided on the lower surfaces of the left and right members. The load bearing strength is further improved.

  According to invention of Claim 4, while providing a rib in the inner edge of a front-and-back member, the breakage-proof strength of an inner edge can be raised, and an inner edge is inclined downward from an outer edge. Since it is located below, even when an upward rib is provided, it is possible to provide a rib having a large height, and it is possible to easily provide a rib having a required height according to a desired strength. .

According to the fifth aspect of the present invention, when the chair is used, the seat can be safely slid back and forth and adjusted to a preferred position.

According to the sixth aspect of the present invention, it is possible to easily form the locking means that can reliably perform the locking action, and to set the concave receiving portion on one side in the front-rear direction with respect to the seat support rod. It is also easy to form so that the release stopper can be released only when it is moved largely.

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 or a porous sheet on the upper surface of the seat frame (23).
FIG. 8 is an enlarged perspective view showing a part of the seat frame (23) on which the skin material (24) is stretched, and FIG. 9 is an enlarged sectional view taken along line IX to IX in FIG.
As shown in FIGS. 8 and 9, the left and right members (23a) and (23a) in the seat frame (23) are inclined downward from the outer edge (23b) in the left and right direction toward the inner edge (23c). Similarly, the front and rear members (23d) and (23d) are also formed to be inclined downward from the outer end edge (23e) in the front and rear direction toward the inner end edge (23f).
On the inner end edge (23f) of the front and rear members (23d) and (23d), an upward rib (23g) is provided over the entire length.

FIG. 10 is a lower enlarged perspective view of the main part of the seat (14) before assembly. The seat frame (23) is generally formed of a synthetic resin, and on the left and right sides of the lower surface thereof, a concave strip receiving portion (25) facing in the front-rear direction is integrally formed at the time of molding. The concave receiving portion (25) opens downward, and the inner side surface (26) on the inner side in the left-right direction of the concave receiving portion (25) is an upright surface that stands upward from the lower surface of the seat frame (23). there are, on the lower edge of its, a plurality of horizontal direction of the locking piece away around (27) is provided.
Further, the outer side surface (26a) on the outer side in the left-right direction in the concave receiving portion (25) is formed by the inner side surface of the ridge (26b) facing the front-rear direction depending from the lower surface of the seat frame (23).

  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).

  11 is a sectional view taken along line XI-XI in FIG. 4, and FIG. 12 is a sectional view taken along line XII-XII in FIG. The positional relationship between the locking piece (29) of the seat support rod (15) and the locked piece (27) of the seat frame (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 frame (23) is moved forward relative to the receiving portion (25) and moved within the normal back-and-forth movement area of the seat frame (23) when the chair (100) is used, the seat frame (23) The locked piece (27) engages with the locking piece (29) of the seat support rod (15) so that the seat frame (23) does not come off from the seat support rod (15). (See FIG. 12). 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 frame (23) is 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) constituting the slip prevention means between the concave receiving portion (25) and the seat support rod (15) in the seat frame (23) 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.

  FIGS. 13, 14, and 15 are an enlarged upper perspective view, a lower perspective view, and a side view of the lever member (30), respectively.

As shown in FIGS. 13 to 15, 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. 16 is an enlarged top perspective view of the spacer member (36) used when the lever member (30) is attached to the seat frame (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. 17 is an enlarged upper perspective view (circle A portion in FIG. 3) of the lever member attaching portion (39) in the seat frame (23).

  The lever member mounting portion (39) includes a front-rear receiving portion (41a) comprising an opening (40) in the front-rear direction provided in the seat frame (23) and an upper surface portion of the seat frame (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).

  18 and 19 are enlarged upper perspective views showing a procedure for attaching the lever member (30) to the seat frame (23).

First, the lever member (30) with the lever handle (31) on the outer side in the left-right direction, for example, the front end (33a) of the rotating shaft (33) from the lower side of the seat frame (23), the lever member mounting portion (39) is inserted from the front part of the opening (40) and is supported by the front receiving part (41a) on the upper surface of the seat frame (23), and then the rotating shaft (33) is placed in a horizontal state and the lever member (30 ) Is moved slightly rearward so that 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 frame (23) to obtain the state shown in FIG. Next, from the lower side of the seat frame (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 frame (23), the state shown in FIG. 19 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 frame (23) and the lever handle. (31) is pivotally mounted on the seat frame (23) stably with the pivot shaft (33) as a pivot.

  20 is an enlarged perspective view of the lower part of the seat frame (23) in which the seat support rod (15) and the lever member (30) are assembled. FIG. 21 is a sectional view taken along line XXI-XXI in FIG. FIG. 22 is a sectional view taken along line XXII to XXII in FIG. 21.

  As shown in FIG. 20, 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. 21, the lever handle (31) is attached 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 frame (23). It is energized.

FIG. 20 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), The state in which the relative movement of the seat frame (23) with respect to (15) is restricted is shown. In this state, in order to move the seat frame (23) and adjust the position of the seat (14) in the front-rear direction, a 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 frame (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).

  The position A of the lever handle (31) indicated by the solid line in FIG. 21 is engaged with the locking piece (35) of the lever handle (31) and the engagement groove (44) of the seat support rod (15). 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 20, a stopper (47) is provided on 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) in the seat frame (23) are engaged, and the seat The frame (23) does not come off the seat support rod (15).

Thus, the stopper (47) restricts the forward / backward movement area of the seat frame (23) during normal use of the chair.
In order to release the restriction by the stopper (47), the following may be performed.

  First, the spacer member (36) is pulled downward and removed from the seat frame (23) (see FIG. 20). Next, when the lever handle (31) is rotated counterclockwise in FIG. 21, 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 position, the locking piece (35) of the lever handle (31) does not come into contact with the stopper (47), and the seat frame (23) of the stopper (47) The restriction of forward / backward movement is released.

  Therefore, as shown by a two-dot chain line in FIG. 11, the seat frame (23) is substantially in contact with the rear end of the concave receiving portion (25) in the seat frame (23). It is possible to move forward to the contact position. When the seat frame (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 frame (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. FIG. 3 is an enlarged perspective view showing a part of a seat frame on which a skin material is stretched. It is the IX-IX line sectional enlarged view in FIG. It is a downward expansion perspective view of the principal part of the seat before an assembly. It is the XI-XI sectional view taken on the line in FIG. It is the XII-XII sectional view taken on the line in FIG. 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 frame. It is an expansion upper perspective view which shows the procedure which attaches a lever member to a seat frame. Similarly, it is an expansion upper perspective view which shows the procedure which attaches a lever member to a seat frame. It is a downward expansion perspective view of the principal part of the seat after an assembly. It is the XXI-XXI sectional view taken on the line in FIG. It is the XXII-XXII 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 frame
(23a) Left and right members
(23b) Outer edge
(23c) Inner edge
(23d) Front and rear members
(23e) Outer edge
(23f) Inner edge
(23g) Ribs
(24) Skin material
(25) Recess receiving part
(26) Inner side
(26a) Outer surface
(26b) Projections
(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 (6)

In a seat structure of a chair in which a net or porous sheet skin material is stretched on the upper surface of the seat frame, the left and right members of the seat frame are formed so as to tilt downward from the outer edge in the left and right direction toward the inner edge. In addition, a concave frame receiving portion that is slidably fitted back and forth on seat support rods facing in the front-rear direction provided on the left and right sides of the support base attached to the upper end of the pedestal is provided on the lower surface of the left and right members. The inner surface on the inner side in the left-right direction of the concave groove receiving portion that is formed downward is an upright surface that stands upward from the lower surface of the seat frame, and the outer side in the left-right direction of the concave groove receiving portion. A seat structure for a chair, characterized in that the outer side surface of the chair is formed by an inner side surface of a ridge facing in the front-rear direction depending from the lower surface of the seat frame .   The seat structure of a chair according to claim 1, wherein the front and rear members of the seat frame are formed so as to be inclined downward from the outer edge in the front-rear direction toward the inner edge.   The seat structure of the chair according to claim 1 or 2, wherein ribs in the left-right direction are provided on the front and rear members of the seat frame.   The seat structure of the chair according to claim 3, wherein upward or downward ribs in the front and rear members are provided on the inner end edges of the front and rear members over the entire length thereof. The seat structure for a chair according to any one of claims 1 to 4, further comprising a detent means for preventing the fitting of the seat support rod and the recess receiving portion from coming off. The stopper means is provided on at least one of the left and right sides of each seat support rod with a locking piece projecting in the left-right direction, and the recess receiving portion is provided with front and rear of the recess receiving portion when the chair is used. In the moving region, it is configured by providing a locked piece that is positioned below the locking piece and that is separated from the seat support rod in the front-rear direction to prevent the concave strip receiving portion from coming off upward. The seat structure of the chair according to claim 5, characterized in that:

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