JP2005211250A - Seat for chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat for the chairs which enables the obtaining of a connection part with a sufficient strength. <P>SOLUTION: In the seat 1 for the chairs having a middle shell 3 with a cushion body mounted on the front and an outer shell 5 mounted on the rear of the middle shell 3, a step part 15 protruding backward on the side below the upper end rim 3a of the middle shell is provided in the top part of the rear of the middle shell while a cut 16 opened in the top and back parts is provided at the step part and an engaging piece 17 facing upward is provided protrusively on the undersurface of the cut and a box-like engaging part 19 with the bottom part opened engageable with the engaging piece 17 while being fitted into the cut 16 is provided on the top part of the front of the outer shell 5. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a seat for a chair provided with a synthetic resin middle shell on which a cushion body is mounted on the front surface, and a synthetic resin outer shell attached to the rear surface of the middle shell.

  As a seat for a chair, two support pieces are set up in parallel on one of the opposing surfaces of the inner shell and the outer shell, and the ends of the support pieces are connected by a connecting piece. A space portion is formed by the surface, the support piece, and the connecting piece, and a downward L-shaped hook-shaped piece provided on the other surface is inserted into the space portion, thereby coupling the middle shell and the outer shell to each other. (For example, refer to Patent Document 1).

  In the chair seat, when a force in a direction in which the outer shell is relatively separated from the middle shell is applied, the hook-shaped piece is restricted by the connecting piece, and the separation of the outer shell from the middle shell is prevented. When a force in a direction in which the outer shell moves sideways is applied to the shell, the side surface of the bowl-shaped piece is restricted by the support piece, and the lateral movement of the outer shell relative to the middle shell is prevented.

  In addition, an elastic locking piece is provided on one of the opposing surfaces of the middle shell and the outer shell, and an engaging protrusion is provided on the other, and the claw formed at the tip of the engaging protrusion is used as the elastic engaging piece. There is one in which an intermediate shell and an outer shell are coupled to each other by being engaged (see, for example, Patent Document 2).

In the chair seat disclosed in Patent Document 2, a hollow portion is formed on the rear surface of the middle shell, and a pair of elasticity that inclines inward toward the inside of the hollow portion at the opening of the hollow portion. A locking piece is formed, a shaft portion is projected from the front surface of the outer shell, a flange portion protruding in a hook shape is formed at the front end of the shaft portion, and the flange portion at the front end of the shaft portion is formed as the recess portion. The inner shell and the outer shell are coupled to each other by inserting the collar portion between the elastic locking pieces and locking the collar portion at the front end of the shaft portion to the elastic locking pieces.
JP-A-8-252148 (FIG. 5) Japanese Patent Application No. 7-255556 (FIGS. 1 to 4)

  In the seat for a chair disclosed in Patent Document 1, the hook-shaped piece that is one of the coupling portions is merely protruding from the middle shell, so that sufficient strength cannot be obtained and the hook-shaped piece may be broken. .

  Moreover, in the seat for chairs disclosed in Patent Document 2, the bottom wall of the recess formed in the middle shell protrudes from the front surface of the middle shell toward the cushion body. The load caused by sitting on the chair may adversely affect the coupling portion.

  In view of the above-mentioned problems of the prior art, the present invention provides a joint portion having sufficient strength, and the joint portion partially protrudes from the front surface of the middle shell to reduce cushioning properties. An object of the present invention is to provide a seat for a chair that does not adversely affect the coupling portion when the seat is seated on the chair.

According to the present invention, the above problem is solved as follows.
(1) In a seat for a chair including a middle shell on which a cushion body is mounted on the front surface and an outer shell attached to the rear surface of the middle shell, a lower side than an upper end edge of the middle shell is located on the rear surface upper portion of the middle shell. A step projecting rearward is provided, a notch opening upward and rearward is provided in the step, an engagement piece projecting upward is formed on the lower surface of the notch, and the outer shell A box-like engagement portion that is fitted in the notch and opens downwardly to be engageable with the engagement piece is provided on the front upper portion.

  (2) In the above item (1), the engagement piece and the front surface of the notch facing the engagement piece are connected by a rib, and the rib can be fitted to the engagement portion. A notch is provided.

  (3) In the above paragraph (1) or (2), a concave portion to which the upper portion of the seat frame is fitted and attached is provided at the central portion of the rear surface of the middle shell, and the upper peripheral portion of the concave portion is provided By providing the engagement piece and correspondingly providing an engagement portion on the outer shell, a first coupling portion is formed, and on the left and right peripheral portions of the recess portion, a rear direction and the recess portion direction are formed. Is provided with an elastic engagement piece projecting from the opposite side wall surface in the vertical direction toward the other side wall surface, and further on the front surface of the outer shell. The second coupling portion is provided by providing an engagement protrusion having an engagement claw that can be engaged with the elastic engagement piece at the front end while being fitted.

  (4) In the above paragraph (3), the seat frame is a backrest.

  (5) In the above paragraph (3), the seat frame shall be a scissors in the seat.

According to the present invention, the following effects can be obtained.
(A) According to the invention described in (1) above, substantially the entire inner surface of the front side wall of the box-shaped engagement portion of the outer shell is in contact with the inner surface of the engagement piece of the middle shell, so that the outer shell is Since movement in the direction away from the shell is prevented, the outer shell is firmly coupled to the middle shell without separation, and the outer surfaces of the left and right side walls of the engaging portion are in contact with the inner surfaces of the left and right side walls of the notch. Since the movement of the outer shell in the left-right direction with respect to the middle shell is prevented, damage to the engaging piece is prevented without applying a load to the engaging piece.
Further, since the coupling portion composed of the engagement piece and the engagement portion does not protrude from the front surface of the middle shell toward the cushion body, the load when sitting on the chair is adversely affected on the coupling portion without deteriorating the cushioning property. Never give.

(B) According to the invention described in (2) above, since the engaging piece is connected to the front surface of the notch by the rib, the strength of the engaging piece against the load in the front-rear direction is increased, and the coupling with the outer shell The power can be increased.

(C) According to the invention described in the item (3), the outer shell is pushed downward from the upper rear side of the middle shell to first join the first coupling portion, and then the outer shell is pushed forward toward the middle shell. Accordingly, the outer shell and the middle shell can be firmly coupled to each other by both the first and second coupling portions with a simple operation of coupling the second coupling portion.

(D) According to the invention described in the above item (4), it is possible to easily form the backrest of the chair having a good cushioning property.

(E) According to the invention described in the above item (5), a chair seat having a good cushioning property can be easily formed.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a chair seat according to the present invention, FIG. 2 is an exploded perspective view showing an inner shell, an outer shell, and a backrest of the chair seat shown in FIG. 1, and FIG. It is an enlarged rear view of the middle shell in a state where the shell is removed. 4 to 7 are cross-sectional views showing a state in which the middle shell and the outer shell are coupled to each other, and are taken along lines IV to IV, V to V, VI to VI, and VII to VII in FIG. It is sectional drawing. FIG. 8 is an enlarged perspective view showing a portion A of the middle shell shown in FIG. 3 and a portion of the outer shell corresponding to the portion A. 9 to 11 are cross-sectional views showing a connecting portion in a state where the middle shell and the outer shell are connected to each other, and are cross sections taken along lines IX to IX, X to X, and XI to XI in FIG. 8, respectively. FIG.

  The seat (1) for the chair has the same shape as the middle shell (3) made of a hard synthetic resin with a cushion body (2) made of foamed resin such as urethane on the front, and this middle shell (3). An outer shell (5) for mounting an upper portion of the backrest ridge (4) is provided between the rear surface of the middle shell (3).

  As shown in FIG. 3, the rear surface of the middle shell (3) is formed with a recessed portion (6) having a substantially vertically long quadrilateral shape in front view that accommodates the upper portion of the backrest ridge (4) at the center. Two screw mounting bosses (7) and (8) are erected on the bottom surface of the recessed portion (6) in the horizontal direction at the upper and lower portions, respectively. Female screw holes (7a) and (8a) are formed in the rear end surfaces of these mounting bosses (7) and (8).

  As shown in FIG. 2, the backrest ridge (4) includes two pipes (9) and (9) which are arranged in parallel and bent substantially in an L shape, and the pipes (9) and (9). In the upper part and the intermediate part, it is constituted by connecting plates (10) (11) for connecting the pipes. Screw insertion holes (10a) (11a) are formed in the connecting plates (10) (11).

  As shown in FIGS. 4 and 7, the middle shell (3) brings the bosses (7) and (8) into contact with the connecting plates (10) and (11) of the backrest ridge (4). By screwing the screws (12a) and (12b) inserted into the screw insertion holes (10a) and (11a) of (11) into the female screw holes (7a) and (8a) formed in the bosses (7) and (8), Fastened to the backrest (4).

Further, the outer shell (5) is fitted to the rear surface of the middle shell (3) so as to sandwich the upper portion of the backrest ridge (4), and first and second coupling portions (13), (14) described later (FIG. 5). To the middle shell (3).
As shown in FIGS. 6 and 7, the upper portion of the backrest ridge (4) is mounted in the recessed portion (6) of the middle shell (3) and covered from the rear by the outer shell (5).

  As shown in FIGS. 2 and 3, on the rear surface of the middle shell (3), there are four portions of the step portion (15) provided below the upper edge (3a) of the first coupling portion (13). One element (13a) is formed, and one element (14a) of the second coupling part (14) is formed at each of the upper and lower portions of the left and right peripheral edges (3b) (3b). .

  On the other hand, on the front surface of the outer shell (5), one element (13a) of the first coupling portion (13) of the middle shell (3) and one element (14a) of the second coupling portion (14) are connected. The other element (13b) of the first coupling part (13) and the other element (14b) of the second coupling part (14) are formed at corresponding positions.

  One element (13a) of the first coupling portion (13) of the middle shell (3) is larger than the surface of the upper edge (3a) on the rear surface of the middle shell (3), as shown in FIG. It is formed in a stepped portion (15) protruding rearward, and in this stepped portion (15), a notch (16) that opens upward and rearward, and the left and right and front side walls (16a) in this notch (16) ) (16b) and an engagement piece (17) projecting upward from the lower surface (16c) of the notch (16) at an appropriate interval. The engagement piece (17) and the front side wall (16b) of the notch (16) opposite to the engagement piece (17) are connected to each other by ribs (18) at the left and right intermediate portions. . The rib (18) rises from the lower surface (16c) of the notch (16), and its height is slightly lower than the upper end of the engagement piece (17).

  On the other hand, the other element (13b) of the first coupling portion (13) in the outer shell (5) is constituted by a box-shaped engaging portion (19) opening downward on the front surface of the outer shell (5). ing. A notch (21) that fits into the rib (18) is formed in the center of the side wall (19c) on the front surface side of the engaging portion (19).

  The first coupling portion (13) has an opening (19a) of a box-shaped engagement portion (19) provided in the outer shell (5) above the engagement piece (17) of the middle shell (3). By positioning and moving the outer shell (5) downward, the engaging portion (19) is fitted to the engaging piece (17), and the outer shell (5) is coupled to the middle shell (3). Can be made.

  As shown in FIG. 9, the side walls (19b) and (19c) of the box-shaped engaging portion (19) provided on the outer shell (5) are connected to the side walls (16a) of the notch (16) of the middle shell (3). ) (16b) and a U-shaped groove formed in a plan view between the notch (16) and the lower surface (16c) of the notch (16). The rearward movement of the outer shell (5) away from the outer shell (5) is regulated and prevented by the front side wall (19c) of the engaging portion (19) coming into contact with the locking piece (17), and the outer shell (5 ) In the left-right direction with respect to the middle shell (3) is regulated and prevented by the side wall (19b) of the engaging portion (19) contacting the side wall (16a) of the notch (16).

  12 is an enlarged perspective view showing a portion B of the middle shell (3) shown in FIG. 3 and a portion of the outer shell (5) corresponding to the portion B, and FIG. 13 is an enlarged sectional view of a portion C in FIG. It is.

  One element (14a) of the second coupling portion (14) of the middle shell (3) is a stepped peripheral portion defined on the left and right sides of the recessed portion (6) as shown in an enlarged view in FIG. In (3b), a notch (22) opening in the rear and indented portion (6) direction, and a vertically opposite side wall (22a) surface in the notch (22), toward the other side wall surface And the elastic engagement piece (22b) projectingly provided. The free end of the elastic engagement piece (22b) is bent forward.

  On the other hand, the other element (14b) of the second coupling portion (14) of the outer shell (5) has a U-shape projecting from the front surface of the outer shell (5) and opening rearward in a side view. It is comprised as an engaging protrusion (23) provided with engaging claws (23d) and (23d) above and below the front end.

  The engagement protrusion (23) is fitted into the notch (22) of the middle shell (3), thereby a pair of upper and lower elastic engagement pieces (22b) (22b) ( 22b) is pushed out and inserted so as to get over this, and as shown in FIG. 13, the engaging claws (23d) and (23d) of the engaging protrusion (23) are inserted into the elastic engaging pieces (22b) and (22b). Engaged.

  Although the example in which the present invention is applied to the back seat has been described above, it is obvious that the present invention can also be applied to a seat seat.

It is a perspective view which shows the seat for chairs which concerns on this invention. It is a perspective view which decomposes | disassembles and shows the inner shell of the chair seat of FIG. 1, an outer shell, and the backrest. It is an enlarged rear view of the middle shell in a state where the outer shell is removed. FIG. 4 is a cross-sectional view of a state in which a middle shell and an outer shell are coupled to each other along line IV to IV in FIG. 3. FIG. 5 is a cross-sectional view of the state in which the middle shell and the outer shell are coupled to each other along the line V-V in FIG. 3. It is sectional drawing of the state which couple | bonded the intermediate | middle shell and the outer shell in the VI-VI line | wire of FIG. FIG. 4 is a cross-sectional view of a state in which a middle shell and an outer shell are coupled to each other along line VII to VII in FIG. 3. It is an expansion perspective view which shows the site | part of the middle shell shown in FIG. 3, and the site | part of the outer shell corresponding to this A part. FIG. 9 is a cross-sectional view illustrating a coupling portion in a state where an intermediate shell and an outer shell are coupled to each other in IX to IX of FIG. 8. It is a perspective view which shows the coupling | bond part of the state which couple | bonded the middle shell and the outer shell in the XX line of FIG. It is a perspective view which shows the coupling | bond part of the state which couple | bonded the middle shell and the outer shell in the XI-XI line | wire of FIG. It is an expansion perspective view which shows the site | part of the outer shell corresponding to B part of this middle shell shown in FIG. 3, and this B part. It is an expanded sectional view of the C section in FIG.

Explanation of symbols

(1) Chair seat
(2) Cushion body
(3) Middle shell
(3a) Upper edge (periphery)
(3b) Perimeter
(4) Backrest
(5) Outer shell
(6) Recessed part
(7) (8) Screw mounting boss
(7a) (8a) Female screw hole
(9) Pipe
(10) (11) Connecting plate
(10a) (11a) hole
(12) Screw
(13) First coupling part
(13a) One element
(13b) The other element
(14) Second coupling part
(14a) One element
(14b) The other element
(15) Step (periphery)
(16) Notch
(16a) (16b) Side wall
(16c) Bottom surface
(17) Engagement piece
(18) Rib
(19) Engagement part
(19a) Opening
(19b) (19c) Side wall
(20) Hollow part
(21) Cutting
(21a) Opening
(21b) (21c) Side wall
(22) Notch
(22a) Side wall
(22b) Elastic engagement piece
(23) Engagement protrusion
(23a) Opposite wall
(23b) End wall
(23c) Ceiling wall
(23d) Engaging claw

Claims (5)

In a chair seat comprising a middle shell on which the cushion body is mounted on the front surface and an outer shell attached to the rear surface of the middle shell,
In the upper part of the rear surface of the middle shell, a step is provided that protrudes rearward from the upper edge of the middle shell, and a notch that opens upward and rearward is provided in the step, and the lower surface of the notch is A box-shaped engaging portion that protrudes upward and has a box-shaped engaging portion that fits into the notch and opens at the lower part of the front surface of the outer shell and engages with the engaging piece. A seat for a chair characterized by being provided.   The engagement piece and the front surface of the notch facing the engagement piece are connected by a rib, and the engagement portion is provided with a notch portion into which the rib can be fitted. The chair seat according to claim 1.   At the center of the rear surface of the middle shell, a recess is provided to which the upper part of the seat frame is fitted and attached, and the engagement piece is provided on the upper peripheral edge of the recess, and the outer shell is provided correspondingly. By providing the engaging portion, a first coupling portion is formed, and a left and right peripheral edge portion of the recessed portion is provided with a notch that opens rearward and the recessed portion direction, and the vertical direction within the notched portion Elastically engaging pieces projecting from the opposite side wall surfaces to the other side wall surface, and further fitted into the notches on the front surface of the outer shell and engaged with the elastic engaging pieces at the front end The chair seat according to claim 1 or 2, wherein the second coupling portion is provided by providing an engaging protrusion having a possible engaging claw.   4. The chair seat according to claim 3, wherein the seat frame is a backrest.   The chair seat according to claim 3, wherein the seat frame is a scissors in the seat.

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