JP5253845B2 - Chair - Google Patents

Description

  The present invention relates to a chair having a backrest tilting function.

Chairs capable of tilting the backrest are well known. For example, in the chair disclosed in the following patent document, the upper part of the tension member that forms the backrest surface is supported by the upper frame, the lower part of the tension member is supported by the lower frame, and the upper frame is supported by the lower frame. In contrast, the backrest surface is deformed by being tilted relatively.
JP 2002-119373 A

  The chair as in the above example can be produced only when a stretch material rich in stretchability is employed. However, the process of attaching such a tension material to the frame so that it does not come off even when subjected to the body load of the seated person is relatively cumbersome.

  The main object of the present invention made in view of the above is to realize a tilting function such as a backrest tilt with a structure that can be more easily assembled.

  In the present invention, the backrest member that forms the backrest surface, the lower support body that fixes and supports the lower portion of the backrest member, and the lower support body can be tilted independently, and the backrest member can be tilted when tilted. An upper support that supports the sliding mechanism through a sliding mechanism that allows relative sliding of the upper part of the bending member, and the backrest that is attached to the sliding mechanism and tilts the upper supporting body more than a predetermined angle. A chair comprising a stopper for preventing further sliding on the upper support in the upper part of the member was constructed. If it is such, a special elasticity is not requested | required of a backrest member, The thing which attached the urethane cushion to the resin molding member, the resin molding member, etc. can be used as a backrest member. Therefore, the troublesome process of sticking the tension material to the frame is omitted. In addition, the tilting range of the upper support can be regulated by a stopper attached to the slide mechanism.

  An insertion end that is provided in one of the upper part of the backrest member and the upper support and is provided with a hollow portion that is sandwiched by walls spaced apart from each other in the front-rear direction and extends vertically, and is inserted into the hollow portion and slides in the hollow portion. The slide mechanism is configured by providing an insertion portion having a portion, and when the upper support is tilted by a predetermined angle or more, a part of the insertion portion comes into contact with a part of the wall surrounding the cavity portion. If it is the stopper, a dedicated part for realizing the stopper function is not required, and the number of parts does not increase. In addition, the upper part of the backrest member can be attached to the upper support only with the man-hour for inserting the insertion end into the cavity.

  In the case where the hollow portion is provided in the backrest member, if a sliding contact member that is harder and less deformable than the backrest member is attached to the backrest member and the front wall of the hollow portion is formed by this sliding contact member, Even if the backrest member is bent and deformed by receiving the body load of the seated person, the front wall of the hollow portion is retained, and the sliding of the insertion end is not hindered.

  In order to ensure smooth sliding of the insertion end in the slide mechanism, a sliding contact member having a lower friction coefficient than the other is attached to the other, and the front wall or the rear wall of the cavity is formed by the sliding contact member. Is preferred.

  If the sliding contact member has left and right side walls and a bottom wall connecting the upper ends or the lower ends of both side walls, and the side walls and the bottom wall are respectively joined to the other side, the sliding contact member Installation is solid and structurally stable.

  Specifically, the hollow portion is surrounded by a front wall, a rear wall, and left and right side walls, and an upper end or a lower end thereof is closed by a bottom wall, and the insertion portion is connected to the one side and connected to the other side. It has a base end protruding toward the bottom and an insertion end extending up and down with the base end as a scaffold, and the insertion end enters the cavity from below or above.

  If the width dimension is set larger than the front-rear dimension for the inner shape of the hollow part, and the width dimension is set larger than the front-rear dimension for the outer shape of the insertion end of the insertion part, the backrest member rotates around the vertical axis. It is possible to suppress fluttering that makes a turn.

  Even if there are a plurality of insertion ends of the insertion portion intermittently in the width direction and one or a plurality of hollow portions for inserting the insertion ends are provided, the turning of the backrest member can be suppressed.

  In order to enhance the appearance and style of furniture without revealing the slide mechanism, it is desirable that the hollow portion and the insertion portion are concealed from behind by the upper support or the lower support.

  If the insertion part is integrally formed with the other, it contributes to a reduction in the number of assembly steps of the chair.

  According to the present invention, the tilting function of the backrest can be realized with a structure that can be assembled more simply.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 5, the chair according to the present embodiment has a leg 11, a support base 12 placed on the leg 11, and a rear end portion of the support base 12 that is pivotable about an axis 45. The back support rod 3, the seat support 21 supported on the support base 12 at the front and the back support support 3 at the back, the seat member 22 attached to the seat support 21, and the back support 3 A backrest member 6.

  In the present embodiment, the lower portion 4 and the upper portion 5 of the back support rod 3 are separate members, and the lower portion of the back support member 6 is fixed to the lower portion of the back support rod 4 while the upper portion of the back support member 6 is fixed. Is supported on the upper portion 5 of the back support rod so as to be slidable up and down. In addition, the back support rod upper part 5 can be tilted independently of the back support rod lower part 4.

  More specifically, the back support rod lower portion 4 serving as a lower support body includes a pair of left and right frame bodies 41 positioned outward from both side surfaces of the support base 12, and a plurality of rigid connection shafts 44 that rigidly connect the both frame bodies 41. , 46, 47, and a cover 42 that covers the frame body 41 so that it cannot be directly seen. The back support rod lower portion 4 extends rearward and upward from a lower end portion pivotally attached to the side view support base 12 and has a general shape bent upward and forward near the upper end thereof. An attached portion 43 for attaching a lower portion of the backrest member 6 is provided at the upper end portion of the back support rod lower portion 4. The attached portion 43 is formed with a nut hole (not shown) into which a fastening tool 76 such as a bolt or a screw is screwed.

  The upper portion 5 of the back support rod, which is the upper support, is located between the left and right frame bodies 41 of the lower portion 4 of the back support rod 4 and can be rotated around the shaft 48 around the upper end of the lower portion 4 of the back support rod 4. To support. The upper portion 5 of the back support rod extends upward while curving in a slightly bow shape when viewed from the side. The lower end portion extends rearward and lower than the rear edge of the back support rod lower portion 4.

  An insertion portion 51 is provided on the front side of the upper end portion of the back support rod upper portion 5. As shown in FIGS. 6 to 9, the insertion portion 51 includes a base end 52 that is connected to the front side of the upper portion 5 of the back support rod 5 and protrudes forward, and an insertion end 53 that extends upward with the base end 52 as a scaffold. Is substantially L-shaped in side view. The insertion end 53 is a flat body whose left and right widths are larger than the front and rear thicknesses, and is inserted into a cavity portion of the backrest member 6 described later. The front surface of the insertion end 53 bulges forward in a side view. The back support rod upper part 5 is made of a high-strength material including the insertion part 51, for example, an integrally molded product made of glass nylon.

  As shown in FIGS. 2 and 5, the lower support rod lower portion 4 and the rigid shaft 44 located directly below the support base 12 are interposed between the support base 12 and the entire back support rod 3. It is connected to one end of an elastic member 13 such as a coil spring or a gas spring that generates a reaction force relative to the backward tilting operation. The rigid shaft 46 located on the upper edge side near the middle of the back support rod lower portion 4 serves as a back seat sync shaft that pivotally supports the rear portion of the seat receiver 21. In addition, the rigid shaft 47 located near the upper end of the lower portion of the back support rod 4 is interposed between the upper portion of the back support rod 5 and an elastic member that generates a reaction force relative to the backward tilting operation of only the upper portion of the back support rod 5. 14 is connected to one end. The other end of the elastic member 14 is connected to the lower end portion of the back support rod upper portion 5.

  The backrest member 6 forms a backrest surface that supports the back and waist of the seated person, and can bend and deform under the body load of the seated person. The backrest member 6 includes an outer shell 7 that is a structural member and an inner shell 8 that directly receives the body load of the seated person.

  As shown in FIGS. 1, 3, 6, etc., the outer shell 7 has the upper end and the lower end retreated from the middle in the height direction, and the left and right side ends from the center in the width direction. Is also a three-dimensional plate that has been advanced. The lumbar support 71 in the middle in the height direction has a greater degree of bending and protruding forward than the upper portion 5 of the back support rod in side view. The lumbar support 71 has a slit 72 extending in the width direction. In the region above the lumbar support 71, a number of lightening holes 73 are formed. The opening ratio, which is the ratio occupied by the lightening holes 73 within a certain area of the outer shell 7, gradually increases toward the upper end portion and the side end portion of the outer shell 7. At the lower end portion of the outer shell 7, an attachment portion 74 for attaching to the attached portion 43 of the back support rod lower portion 4 is provided. The attachment portion 74 protrudes far behind the rear surface, and the inner space is opened forward. An insertion hole 741 through which the fastener 76 is inserted is formed in the rear wall.

  In the upper portion of the outer shell 7, a hollow portion 73 is not formed at a position lower than a center and an upper end by a predetermined dimension, and a recessed portion 75 is formed instead. As shown in FIGS. 7 to 9, the recess 75 has a shape that is recessed forward and opened backward. The left and right widths of the recessed portion 75 are larger than the front and rear depths. The side wall 751 of the recessed portion 75, the front edges of the upper wall 752 and the lower wall 753, and the front wall 754 protrude forward from the front surface around the recessed portion 75. The side wall 751 and the upper wall 752 of the recessed portion 75 protrude rearward so as to be edged on the rear surface side, but the lower wall 753 does not. The rear surface of the portion immediately below the recessed portion 75 is an inclined surface that is inclined so as to approach the front wall 754 of the recessed portion 75. On the rear surface of the front wall 754 of the recessed portion 75, there are intermittently a plurality of protrusions 755 across the width direction. The protrusion 755 extends in the up-down direction and has a taper shape in which the front-rear dimension gradually decreases toward the upper side. An insertion hole 756 through which the fastener 97 is inserted is formed at a position near the lower side of the front wall 754. In addition, an insertion hole 757 is formed at the corner where the upper wall 752 of the recessed portion 75 and the front wall 754 intersect. The insertion hole 757 is continuous with the upper edge portion of the front wall 754 of the recessed portion 75, and penetrates the upper wall 752 of the recessed portion 75 from there up and down.

  The inner shell 8 is wrapped with a tension member on a cushion and is attached to the front side of the outer shell 7. Each of the outer shell 7 and the inner shell 8 is an integrally molded product made of an elastically deformable material, for example, polypropylene.

  On the rear surface side of the outer shell 7, a sliding contact member 9 that receives the insertion end 53 of the back support rod upper portion 5 is attached. As shown in FIGS. 6 to 9, the sliding contact member 9 has left and right side walls 91, a front wall 94, a rear wall 93, and an upper wall 92, and has a box shape in which the upper side is closed and the lower side is opened. Is. The side wall 91, the front wall 94, the rear wall 93, and the upper wall 92 of the sliding contact member 9 serve as a peripheral wall that surrounds the hollow portion into which the insertion end 53 of the back support rod upper portion 5 is to be inserted. The inner peripheral surface of the sliding contact member 9, particularly the rear surface of the front wall 94, is a smooth surface so that the insertion end 53 can easily slide. The outer dimension of the sliding contact member 9 substantially corresponds to the inner dimension of the recessed portion 75. And as for the internal dimension of the sliding contact member 9, the width | variety on either side is larger than the depth of front and back. The lower end of the rear wall 93 of the sliding contact member 9 is above the lower end of the front wall 94, and the lower end of the side wall 91 is inclined so as to connect the lower ends. A nut hole 95 into which the fastener 97 is screwed is formed at a position near the lower side of the front wall 94. The peripheral wall of the nut hole 95 projects forward in a boss shape. In addition, a claw 96 is provided at the corner where the upper wall 92 and the front wall 94 intersect. The claw 96 slightly protrudes forward at the upper edge portion of the front wall 94 and extends upward from the upper wall 92. The sliding contact member 9 is made of a material that is harder than the outer shell 7 and has a low coefficient of friction and good sliding properties, for example, an integrally molded product made of polyacetal.

  A procedure for attaching the backrest member 6 to the back support rod 3 will be described. First, the sliding contact member 9 is attached to the outer shell 7. When the claw 96 of the sliding contact member 9 is stored in the upper edge of the recessed portion 75 and inserted into the insertion hole 757 from below, the outer side surface of the side wall 91 of the sliding contact member 9 contacts the inner side surface of the side wall 751 of the recessed portion 75. The upward surface of the upper wall 92 of the sliding contact member 9 is in contact with the downward surface of the upper wall 752 of the recessed portion 75, and the forward surface of the front wall 94 of the sliding contact member 9 is the protrusion 755 of the recessed portion 75. Abut. At the same time, the lower end of the front wall 94 of the sliding contact member 9 is in contact with or close to the upward surface of the lower wall 753 of the recessed portion 75, and the nut hole 95 of the sliding contact member 9 faces the insertion hole 756 of the recessed portion 75. In this state, when the fastener 97 is inserted from the front through the insertion hole 756 and screwed into the nut hole 95 of the sliding contact member 9, the sliding contact member 9 is fixed to the outer shell 7. Thereafter, the inner shell 8 is attached to the front side of the outer shell 7 using a known appropriate method.

  Next, the upper part and the lower part of the backrest member 6 are supported by the upper part 5 and the lower part 4 respectively. The insertion end 53 of the insertion portion 51 of the upper portion of the back support rod 5 is inserted into the cavity portion above the outer shell 7, in other words, the inner space of the sliding contact member 9, and the front surface of the attached portion 43 of the lower portion of the back support rod 4. With the rear wall of the mounting portion 74 of the outer shell 7 faced, the fastener 76 is inserted into the insertion hole 741 from the front and screwed into the nut hole of the mounted portion 43 and tightened. Installation to the support 3 is completed.

  As shown in FIG. 3, in the chair of this embodiment, the back support rod 3 is erected on the back of the backrest member 6 and in the center of both widths. The left and right regions L and R of the intermediate region C behind the back support rod 3 in the upper part of the backrest member 6 can be displaced back and forth without interfering with the back support rod 3 through bending deformation.

  The sliding contact member 9 fixed to the rear surface side of the backrest member 6 and the insertion portion 51 protruding from the front surface side of the upper portion 5 of the back support member 5 can slide up and down the upper part of the backrest member 6 and move forward and backward. A slide mechanism that is supported so as not to be separated is configured. As shown in FIGS. 4 and 5, when only the back support rod upper part 5 is tilted around the axis 48 without moving the back support rod lower part 4, the backrest member 6 is bent and deformed like a side view bow, A lumbar support 71 between the upper part and the lower part protrudes forward. At this time, the upper portion of the backrest member 6 is displaced downward relative to the upper portion 5 of the back support rod, and the insertion end 53 is displaced upward relative to the inside of the cavity. When the upper portion 5 of the back support rod is further tilted and the tilt angle reaches a predetermined size, as shown in FIG. 9, the upper end of the insertion end 53 comes into contact with the upper wall 92 which is the bottom wall of the cavity portion and beyond. Can not slide. As a result, further tilting of the upper portion 5 of the back support rod is prevented. That is, a part of the insertion portion 51 which is a component of the slide mechanism and a part of the peripheral wall 9 of the hollow portion come into contact with each other, so that a stopper function for suppressing the tilting of the back support upper portion 5 is performed.

  As shown in FIG. 3, the slide mechanism is concealed from behind by the back support rod 3. The width of the upper part 5 of the back support rod gradually narrows upward, but the width dimension of the recessed portion 75, the width dimension of the sliding contact member 9, and the width dimension of the insertion portion 51 are larger than both widths of the upper part of the back support rod 5. The sliding contact member 9 and the insertion portion 51 do not appear on the back view.

  According to this embodiment, the backrest member 6 that forms the backrest surface, the lower support body 4 that fixes and supports the lower part of the backrest member 6, and the lower support body 4 can be tilted independently. An upper support 5 that supports a relative sliding of the upper part of the backrest member 6 when tilted, and an upper support 5 that supports the sliding mechanism, and the upper support 5 is attached to the slide mechanism. Since the chair is provided with a stopper that prevents further sliding with respect to the upper support 5 in the upper part of the backrest member 6 when tilted more than an angle, the backrest member 6 is required to have special stretchability. The backrest member 6 may be a resin molded member or a resin molded member with a urethane cushion attached thereto. Therefore, the troublesome process of sticking the tension material to the frame is omitted. In addition, the tilting range of the upper support 5 can be regulated by a stopper attached to the slide mechanism.

  A hollow portion that is sandwiched between walls 93 and 94 that are separated from each other in the front-rear direction is provided at an upper portion of the backrest member 6 and is extended vertically. An insertion end 53 that is inserted into the hollow support portion 4 and slides in the hollow portion. The insertion mechanism 51 is provided to form the slide mechanism, and when the upper support 5 is tilted by a predetermined angle or more, a part of the insertion part 51 surrounds the cavity part. Therefore, a dedicated part for realizing the stopper function is not required, and the number of parts does not increase. In addition, the upper portion of the backrest member 6 can be supported by the upper support body 5 with only the man-hour for inserting the insertion end 53 into the cavity.

  When the hollow portion is provided in the backrest member 6, a sliding contact member 9 that is harder than the backrest member 6 and hard to be deformed is attached to the backrest member 6, and the front wall 94 of the hollow portion is formed by the sliding contact member 9. Therefore, even if the backrest member 6 is bent and deformed by receiving the body load of the seated person, the front wall 94 of the cavity portion is retained, and the sliding of the insertion end 53 is not hindered.

  Since the sliding contact member 9 having a lower coefficient of friction than the backrest member 6 is attached to the backrest member 6 and the front wall 94 and the rear wall 93 of the cavity are formed by the sliding contact member 9, Smooth sliding of the insertion end 53 can be ensured.

  The sliding contact member 9 has left and right side walls 91 and an upper wall 92 as a bottom wall that connects the upper ends of both side walls 91, and the side walls 91 and the bottom wall 92 are respectively recessed portions of the backrest member 6. Since it is joined to 75, the attachment of the sliding contact member 9 becomes strong and structurally stable.

  The hollow portion is surrounded by the front wall 94, the rear wall 93, and the left and right side walls 91, and the upper end thereof is closed by the upper wall 92. The insertion portion 51 is connected to the upper support 5 and the back portion is closed. It has a base end 52 projecting toward the bending member 6 and an insertion end 53 extending vertically from the base end 52 as a scaffold, and the insertion end 53 enters the cavity from below. Time and effort in the process is reduced.

  Since the width dimension of the inner shape of the hollow portion is set larger than the front-rear dimension, and the outer dimension of the insertion end 53 of the insertion portion 51 is set larger than the front-rear dimension, the backrest member It is possible to suppress the fluttering and rattling that 6 rotates around the vertical axis.

  Since the hollow portion and the insertion portion 51 are concealed from the rear by the upper support 5, the slide mechanism is not exposed explicitly, and the beauty and tone as furniture can be enhanced.

  Since the insertion part 51 is integrally formed with the upper support body 5, it contributes to a reduction in the number of assembling steps of the chair.

  The present invention is not limited to the embodiment described in detail above. When enumerated, the inner shell 8 and the cushion in the backrest member 6 are not essential. The example shown in FIG. 10 is an embodiment in which the outer shell 7 itself forms a backrest that directly supports the body of the seated person. In this example, the recessed portion 75 formed in the upper part of the backrest member 6 protrudes rearward exclusively and does not protrude forward. In addition to the side wall 751, the front wall 754, and the upper wall 752, the recessed portion 75 also has a rear wall 758 that connects the rear edges of the left and right side walls 751. An insertion hole 757 that is recessed upward is formed on the lower surface of the upper wall 752 of the recessed portion 75. The sliding member 9 has a side wall 91, a front wall 94, and an upper wall 92, but does not have a rear wall. When the sliding contact member 9 is attached to the recessed portion 75, the side wall 91, the front wall 94, the upper wall 92, and the rear wall 758 of the recessed portion 75 of the sliding contact member 9 become peripheral walls that surround the cavity portion.

  The stopper that restricts the tilting range of the upper support 5 may take a different aspect from the above embodiment. In the example shown in FIG. 11, when the back support rod upper part 5 as the upper support is tilted by a predetermined angle or more, the base part of the insertion part 51 comes into contact with the peripheral wall 93 of the cavity part to perform a stopper function. In short, the insertion end 53 of the insertion portion 51 and the bottom wall 92 of the hollow portion are not necessarily in contact with each other and become a stopper.

  As shown in FIG. 12, an insertion portion 77 having an insertion end 79 can be provided in the backrest member 6, and a cavity portion into which the insertion end 79 is inserted can be provided in the back support rod 3. In the insertion portion 77 in this example, a base end 78 that is connected to the rear surface side of the backrest member 6 and protrudes rearward and an insertion end 79 that extends downward with the base end 52 as a scaffold form a substantially L shape in side view. Is. The rear surface of the insertion end 79 bulges rearward in a side view. The sliding contact member 9 has left and right side walls 91, a front wall 94, a rear wall 93, and a lower wall 98. The sliding contact member 9 has a box shape in which the lower part is closed and the upper part is opened. The concave portion 54 is fixed. The side wall 91, the front wall 94, the rear wall 93, and the lower wall 98 of the sliding contact member 9 of the sliding contact member 9 serve as a peripheral wall that surrounds the hollow portion into which the insertion end 79 is to be inserted. When only the upper portion of the back support rod 5 is tilted around the axis 48 without moving the lower portion of the back support rod 4, the upper part of the backrest member 6 is displaced downward relative to the upper portion of the back support rod 5 and inserted. The end 79 slides in the cavity and is displaced relatively downward. When the back support rod upper part 5 is further tilted and the tilt angle reaches a predetermined size, the lower end of the insertion end 79 comes into contact with the lower wall 98, which is the bottom wall of the cavity, and cannot slide any further.

  As shown in FIG. 13, the upper part of the backrest member 6 is fixed to the upper support 5, and the lower part of the backrest member 6 is slidably supported by the lower support 4 via the slide mechanism. Good. The insertion portion 70 in this example has a base end 701 that is connected to the rear surface side of the outer shell 7 of the backrest member 6 and protrudes rearward, and an insertion end 702 that extends upward with the base end 701 as a scaffold in a side view. It is L-shaped. The sliding contact member 9 has left and right side walls 91, a front wall 94, a rear wall 93, and an upper wall 92. The sliding contact member 9 has a box shape in which the lower part is closed and the upper part is opened. It fixes to the recessed part 40 provided in the side. The side wall 91, the front wall 94, the rear wall 93, and the upper wall 92 of the sliding contact member 9 of the sliding contact member 9 serve as a peripheral wall that surrounds the hollow portion into which the insertion end 53 is to be inserted. When only the upper portion of the back support rod 5 is tilted around the axis 48 without moving the lower portion of the back support rod 4, the lower part of the backrest member 6 is displaced upward relative to the lower portion of the back support rod 4 and inserted. The end 702 slides in the cavity and is displaced relatively upward. When the back support rod upper part 5 is further tilted and the tilt angle reaches a predetermined size, the upper end of the insertion end 702 comes into contact with the upper wall 92 which is the bottom wall of the hollow portion and cannot slide any more.

  A plurality of slide mechanisms may be provided. In the example shown in FIG. 14, the upper end portion of the upper portion of the back support rod 5 branches in the width direction, and a slide mechanism, that is, a hollow portion 9 and an insertion portion 51, between each branch and an upper portion of the backrest member 6, respectively. Is installed. Even if it is such, fluttering and rattling that the backrest member 6 turns around the vertical axis can be suppressed.

  Alternatively, a plurality of insertion ends 53 of the insertion portion 51 may be intermittently juxtaposed in the width direction, and the insertion ends 53 may be inserted into the same cavity.

  Instead of causing the front surface of the insertion end 53 (or the rear surface of the insertion end 79) to bulge toward the front wall 94 (or the rear wall 93) in the side view, the front wall 94 (or rear wall) of the cavity 93) may be bulged toward the insertion end 53 (or the insertion end 79) in a side view.

  The sliding contact member 9 is also not essential. It does not prevent the hollow portion (and the peripheral walls such as the front wall, the rear wall, and the bottom wall) from being integrally formed in the backrest member 6 or the support 3.

  Other specific configurations of each part can be variously modified without departing from the spirit of the present invention.

The side view of the chair of one embodiment of the present invention. The side view which shows the link mechanism of the chair (except for the cover). The rear view of the chair. The side view which shows the tilt operation of the chair. The side view which shows the tilting operation | movement of the chair corresponding to FIG. The principal part disassembled perspective view which shows the outer shell, back support rod upper part, and sliding contact member in the chair. The principal part flat end view which shows the outer shell in the same chair, an insertion end, and a sliding contact member. The principal part sectional side view which shows the outer shell, back support rod upper part, and sliding contact member in the chair. The principal part sectional side view which shows the relative slide movement of the backrest member at the time of tilting operation | movement of the chair. The principal part side sectional view which shows one of the modifications of this invention. The principal part side sectional view which shows one of the modifications of this invention. The principal part side sectional view which shows one of the modifications of this invention. The principal part side view which shows one of the modifications of this invention. The rear view which shows one of the modifications of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 ... Support body 4 ... Lower support body 5 ... Upper support body 51 ... Insertion part 6 ... Backrest member 9 ... Sliding member, Perimeter wall of cavity part

Claims (8)

A backrest member;
A lower support for fixing and supporting a lower part of the backrest member;
An upper support that is tiltable independently of the lower support, and supports it via a slide mechanism that allows relative sliding of the upper part of the backrest member when tilting;
Attached to the slide mechanism, and provided with a stopper that prevents further sliding relative to the upper support in the upper part of the backrest member when the upper support is tilted by a predetermined angle or more ,
An insertion end that is provided in one of the upper part of the backrest member and the upper support and is provided with a hollow portion that is sandwiched by walls spaced apart from each other in the front-rear direction and extends vertically, and is inserted into the hollow portion and slides in the hollow portion. The slide mechanism is configured by providing an insertion portion having
When the upper support is tilted by a predetermined angle or more, a part of the insertion part comes into contact with a part of the wall surrounding the cavity and becomes the stopper,
In the case where the hollow portion is provided in the backrest member, a sliding contact member that is harder and less deformable than the backrest member is attached to the backrest member, and the front wall of the hollow portion is formed by the sliding contact member. And a chair. The chair according to claim 1, wherein a sliding contact member having a lower friction coefficient than the other is attached to the other, and a front wall or a rear wall of the hollow portion is formed by the sliding contact member . The sliding contact member has left and right side walls and a bottom wall that connects upper ends or lower ends of both side walls, and the side walls and the bottom wall are respectively joined to the other side. The chair according to 1 or 2 . The hollow portion is surrounded by a front wall, a rear wall, and left and right side walls, and an upper end or a lower end thereof is closed by a bottom wall,
The insertion portion has a base end that is connected to the one and protrudes toward the other, and an insertion end that extends vertically with the base end as a scaffold, and the insertion end enters the cavity from below or above The chair according to any one of claims 1 to 3, wherein the chair enters . The inner shape of the hollow portion has a width dimension larger than a front-rear dimension,
The chair according to any one of claims 1 to 4, wherein the outer shape of the insertion end of the insertion portion has a width dimension larger than a front-rear dimension . There are a plurality of insertion ends of the insertion portion intermittently in the width direction,
The chair according to any one of claims 1 to 5, wherein one or a plurality of hollow portions into which the insertion ends are inserted are provided . The chair according to any one of claims 1 to 6, wherein the hollow portion and the insertion portion are concealed from the rear by the upper support or the lower support . The chair according to any one of claims 1 to 7, wherein the insertion portion is integrally formed with the other .

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