JP5521206B2 - Chair backrest - Google Patents

Description

  The present invention relates to a component of a chair backrest.

There are various types of chairs used in offices and the like. Even if paying attention to the backrest, the frame is stretched with a stretchable mesh material (see, for example, Non-Patent Document 1 below), or the shell is attached to the front of the shell (for example, Non-Patent Document 2 below) and those mainly composed of a hard resin plate (for example, see Non-Patent Document 3 below).
“FOSTER ETHOS”, KOKUYO General Catalog 2008 Edition, KOKUYO Corporation, December 2007, p. 320-323 “SEDISTA”, KOKUYO General Catalog 2008 Edition, KOKUYO Corporation, December 2007, p. 356-359 “Proty”, KOKUYO General Catalog 2008 Edition, KOKUYO Corporation, December 2007, p. 392-393

  If the back surface that supports the body of the seated person is formed of a single resin molded member, the manufacturing cost can be reduced as compared with a case where a tension member is stretched or a cushion is attached.

  However, with conventional hard resin plates, it is impossible to realize the deformability and elasticity of the backrest surface, which is disadvantageous in terms of sitting comfort of the chair.

  The present invention, which has been made paying attention to the above problems, has an intended purpose of effectively imparting deformability and elasticity to a resin-integrated backrest member.

In order to solve the above-described problems, in the present invention, a body holding part that has a belt-like or plate-like shape and that directly or indirectly contacts the body of the seated person and receives the load of the seated person, and the body holding part The frame part that supports the body, the end part of the body holding part and the frame part are interposed and connected to each other, and the distance between the end part of the body holding part and the frame part is expanded and contracted through elastic deformation The resin stretchable part does not protrude forward from the front of the body holding part, and it forms the back of the chair that supports the back of the seated person without attaching a cushion to the front It was decided.

  That is, the body holding part can be displaced relative to the frame part by extending the telescopic part, and at the same time, an elastic repulsive force according to the load on the seated person's body can be exhibited. If it is such, it can manufacture at a comparatively low cost, and the deformability and elasticity of a backrest surface are also ensured. Moreover, since the expansion / contraction part is connected to the end part of the body holding part, it is difficult to touch the seated person's body and it is difficult to disturb the sitting comfort.

  The expansion / contraction part is formed in a bowl shape extending and contracting in the left / right, up / down or front / rear direction, for example, with a shape projecting and retracting in the front / rear or left / right direction.

  If the expansion / contraction part protrudes behind the body holding part and is formed so as not to protrude forward from the front surface of the body holding part, it can be avoided that the expansion / contraction part comes into contact with the body of the seated person.

  More specifically, the frame portions are provided in pairs on the left and right sides, the body holding portion is provided in the area between them, and the left end portion or the right end portion of the body holding portion is connected to the frame portion via the extendable portion.

  The elastic part is interposed between the body holding part that supports the back of the seated person and the frame part, while the elastic part is not interposed between the body holding part that supports the waist of the seated person and the frame part. For example, the body holding part that supports the lumbar part does not sink backward even when a load is applied, and a lumbar support function can be realized.

  The expansion / contraction part connected to the body holding part supporting the relatively upper part of the seated person's body has a more extensible amount than the expansion / contraction part connected to the body holding part supporting the relatively lower part of the seated person's body. If it is large, the backrest surface shape can be formed so as to wrap the back of the seated person when the seated person is drowning so as to leave the body.

  The left end portion is connected to the upper end portion of the left frame portion, the right end portion is connected to the upper end portion of the right frame portion, and the connecting body that connects the left and right frame portions is provided. If the connecting body is bent or bent and is separated rearward from the body holding portion, the deformable shape and elasticity can be realized even on the uppermost side of the backrest surface.

  The frame portions may be provided as a pair in the vertical direction, the body holding portion may be provided in the region between them, and the upper end portion or the lower end portion of the body holding portion may be connected to the frame portion via the extendable portion.

  According to the present invention, resilience and mobility can be imparted to a backrest member molded with resin, and this can contribute to improving the sitting comfort of a chair using the backrest member.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a chair to which a backrest member 1 according to the present invention is applied. Like the existing chair, this chair comprises a leg 5, a support base 4 attached to the upper part of the leg 5, a seat 3 and a backrest 2 supported by the support base 4. The backrest member 1 of a hard resin integral molded product is employed as a main component constituting the body 2.

  As shown in FIG. 2 and the like, the backrest member 1 includes a body holding part 11 that receives a load of the seated person in contact with the body of the seated person, frame parts 12 and 13 that support the body holding part 11, and a body holding part. An expansion / contraction part 14 is provided between the end part of the part 11 and the frame parts 12 and 13 to connect them. The elastic part 14 expands / contracts the distance between the end part of the body holding part 11 and the frame parts 12 and 13 through elastic deformation.

  <First Embodiment> In the backrest member 1 shown in FIGS. 2 to 4, the frame portion 13 is formed by extending the upper end portions and the lower end portions of the pair of left and right frame portions 12 extending in the vertical direction in the left-right direction. Are connected to each other to construct a four-sided frame when viewed from the front, and the body holding part 11 extended in the left-right direction is arranged on the inner periphery thereof. The two are connected by interposing.

  The body holding part 11 is more flexible than the frame parts 12 and 13 and has a strip shape in which the front and rear thicknesses are thinner than the vertical width. In the example shown in FIG. 2, a plurality of body holding portions 11 are provided in the vertical direction. The stretchable portion 14 is connected to the left and right end portions of the band-shaped body holding portion 11 and has a hook shape (or a wave shape) folded so as to project back and forth therefrom. The telescopic part 14 protrudes backward and does not protrude forward from the front surface of the body holding part 11. The stretchable part 14 has a higher elastic modulus than the body holding part 11 and the frame parts 12, 13, that is, is easily elastically deformed and stretched. When the body holding portion 11 receives a load on the seated person's body, the hook-like portion of the expansion / contraction portion 14 expands by elastic deformation, and the distance between the end portion of the body holding portion 11 and the frame portion 12 is increased. spread. As a result, the body holding part 11 is displaced backward relative to the frame parts 12 and 13. At the same time, the stretchable part 14 exerts an elastic repulsive force that pushes back the seated person's body through the body holding part 11. When the seated person leans on the backrest 1 in a posture that is biased to the left or right, in other words, when an unbalanced load is applied, one of the left and right stretchable parts 14 as shown in FIG. Elongates more than the other, and the dorsal surface tilts to the left or right.

  The body holding part 11 and the expansion / contraction part 14 arranged vertically are independent from each other. As illustrated in FIGS. 3A and 3B, the stretchable portion 14 (shown in FIG. 3A) positioned relatively upward is rearward compared to the stretchable portion 14 (shown in FIG. 3B) positioned relatively below. The length of the bay has increased, and the amount that can be stretched is large. Therefore, the higher the body holding portion 11 sunk deeper rearward when receiving a load.

  It is also conceivable that the body holding part 11 at a certain position is difficult to sink and the body holding part 11 at another position is easily sinked by changing the elastic modulus of each stretchable part 14 at various places. In order to change the elastic modulus of the expansion / contraction part 14, the protruding length of the ridge-like part and the number of ridges are changed, the wall thickness is made thin or thin, or reinforcement such as a rib is formed in association with the expansion / contraction part 14.

  The backrest member 1 is supported by the main body side of the chair, usually the support base 4. When the left and right frame parts 12 and 13 have sufficient strength, the frame parts 12 and 13 can be extended forward and downward, and the extended ends thereof can be pivotally supported on the support base 4 so as to be fixed or tiltable. The backrest member 1 is not directly supported by the support base 4, but the frame portions 12 and 13 are attached to a metal back support rod or the like connected to the support base 4 to support the backrest member 1. Good.

  <Second Embodiment> In the backrest member 1 shown in FIG. 5, both end portions of the body holding portion 11x corresponding to the height position of the waist of the seated person are directly connected to the frame portion 12 without the stretchable portion 14. Connected. Even if this body holding part 11x receives a load, it does not sink behind, but functions as a lumbar support.

  <Third Embodiment> In the backrest member 1 shown in FIGS. 6 to 7, the frame portion 13 connecting the upper ends of the left and right frame portions 12 is eliminated, and the body holding portion 11 is bridged instead. Yes. This body holding part 11 also has an end connected to the frame part 12 via the expansion / contraction part 14 and is displaced rearward as the expansion / contraction part 14 is extended when a body load of the seated person is received.

  Since the frame part 13 on the upper side is eliminated, one of the left and right frame parts 12 may tilt backward with respect to the other, leading to a twist of the backrest. Therefore, a connecting body 15 that connects the left and right frames is provided separately. Is preferred. Regardless of the material such as hard resin or metal, the connecting body 15 can be attached to the frame portion 12 later without being integrally formed with the backrest member 1. As shown in FIG. 7, the connecting body 15 has left and right end portions respectively connected to the left and right frame portions 12, and an intermediate portion curved or bent in plan view and separated rearward from the body holding portion 11. The body holding part 11 is allowed to be displaced backward without interfering with the body holding part 11.

  In addition, in the backrest member 1 shown in FIG. 6, a band-shaped body holding portion 11y extended in the vertical direction is added so as to connect the body holding portions 11 and 11x that are separated from each other in the vertical direction. Thereby, the body holding | maintenance part 11, 11x, 11y forms the backrest surface of a front view lattice net shape.

  <Fourth Embodiment> In the backrest member 1 shown in FIG. 8, the belt-like body holding portion 11 extended in an oblique direction when viewed from the front has a lattice net shape as a whole. The point which has the expansion-contraction part 14 interposed between the edge part of the body holding part 11 and the frame parts 12 and 13 is the same as the past. A part of the belt-shaped body holding part 11 has one end connected to the left or right frame part 12 and the other end connected to the upper or lower frame part 13.

  <Fifth Embodiment> In the backrest member 1 shown in FIG. 9, the upper and lower end portions of the belt-like body holding portion 11 expanded in the vertical direction and the frame portion 13 paired in the vertical direction are provided with the stretchable portion 14. Connected through.

  <Sixth Embodiment> In the backrest member 1 shown in FIG. 10, the body holding portion 11 has a plate shape that is expanded vertically and horizontally, and is expanded and contracted between the left and right ends and the left and right frame portions 12. The part 14 is interposed, and / or the elastic part 14 is interposed between the upper and lower end parts and the upper and lower frame parts 13 to connect them. You may drill a through-hole, a slit, etc. in the plate-shaped body holding part 11.

  <Seventh Embodiment> In the backrest member 1 shown in FIG. 11, an extendable part 14 is formed extending along the inner edge of the frame part 12, and the end part of the body holding part 11 is attached to the extendable part 14. It is connected.

  <Eighth Embodiment> In the backrest member 1 shown in FIG. 12, the end portion of the body support portion 11 and the frame portion 12 are biased in the front-rear direction, and the stretchable portion 14 is interposed therebetween. Unlike the conventional ones, the expansion / contraction part 14 has a hook shape that protrudes and sinks in the left-right direction instead of the front-rear direction, but does not protrude forward from the front surface of the body holding part 11. The telescopic part 14 is compressed when it receives a load on the body of the seated person via the body support part 11 and allows the body holding part 11 to be displaced rearward. Exhibits an elastic repulsive force that pushes the body forward. When the seated person leans on the backrest 1 in a posture biased to the left or right, in other words, when an unbalanced load is applied, as illustrated in FIG. Is compressed more than the other, and the backrest surface tilts to the left or right.

  According to this embodiment, the body holding part 11 that receives the load of the seated person, the frame parts 12 and 13 that support the body holding part 11, the end of the body holding part 11, and the frame parts 12 and 13 Since the elastic member 14 is integrally formed with the stretchable part 14 that expands and contracts the distance between the end part of the body holding part 11 and the frame parts 12 and 13 through elastic deformation. In addition to being manufactured at a low cost, the backrest can be deformed and elastic. Moreover, since the expansion-contraction part 14 exists in a row from the edge part of the body holding part 11, it is hard to touch a seated person's body and does not become obstructive of sitting comfort.

  The stretchable portion 14 is shaped so as not to protrude forward from the front surface of the body holding portion 11, and the stretchable portion 14 can be prevented from coming into contact with the body of the seated person and feeling uncomfortable.

  If the frame part 12 is provided in a pair on the left and right, the body holding part 11 is provided in the area between them, and the left end or right end part of the body holding part 11 is connected to the frame part 12 via the extendable part 14 Coupled with the flexibility of the body holding portion 11, the central portion in the left-right direction can be sunk most deeply backward, and fits the body of the seated person.

  While the stretchable part 14 is interposed between the body holding part 11 that supports the back of the seated person and the frame part 12, the stretchable part 14 is provided between the body holding part 11x that supports the waist of the seated person and the frame part 12. If the body is not interposed, the body holding portion 11 that supports the lumbar portion does not sink back even when a load is applied, and a lumbar support function can be realized.

  The stretchable part 14 connected to the body holding part 11 supporting the relatively upper part of the seated person's body is more than the stretchable part 14 connected to the body holding part 11 supporting the relatively lower part of the seated person's body. If the stretchable amount is large, the backrest surface shape can be formed so as to wrap the back of the seated person when the seated person leans over so as to leave the body.

  A body holding portion 11 having a left end connected to the upper end of the left frame portion 12 and a right end connected to the upper end of the right frame portion 12 is provided, and a connecting body 15 that connects the left and right frame portions 12 to each other. If the connecting body 15 is curved or bent and is separated rearward from the body holding portion 11, the deformable shape and elasticity can be realized even on the uppermost side of the backrest surface.

  If the frame part 13 is provided in pairs in the vertical direction, the body holding part 11 is provided in the area between them, and the upper end or lower end part of the body holding part 11 is connected to the frame part 13 via the extendable part 14 The intermediate portion in the vertical direction of the body support portion 11 can be submerged most deeply and fits the seated person's body.

  The present invention is not limited to the embodiment described in detail above. In the above embodiment, both ends of the body holding part 11 are connected to the frame parts 12 and 13 via the expansion / contraction part 14, but the expansion / contraction part 14 is provided only at one end of the body holding part 11 and the other. This end portion does not prevent the embodiment from being connected directly to the frame portions 12 and 13 without using the stretchable portion 14.

The backrest member 1 may be covered with a tension member that covers the front surface and / or the rear surface thereof .

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

The front view which shows the chair which applied the backrest member which concerns on this invention. The front view of the backrest member of one Embodiment of this invention. The AA line flat end view of the backrest member of the embodiment. The BB line flat end view of the backrest member of the embodiment. The flat end view which illustrates the state which the backrest member of the embodiment received the eccentric load. The front view of the backrest member of one Embodiment of this invention. The front view of the backrest member of one Embodiment of this invention. The CC end plane end view of the backrest member of the embodiment. The front view of the backrest member of one Embodiment of this invention. The front view of the backrest member of one Embodiment of this invention. The front view of the backrest member of one Embodiment of this invention. The front view of the backrest member of one Embodiment of this invention. The flat end view of the backrest member of one Embodiment of this invention. The flat end view which illustrates the state which the backrest member of the embodiment received the eccentric load.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Backrest member 11, 11x, 11y ... Body holding part 12, 13 ... Frame part 14 ... Expansion-contraction part 15 ... Connection body

Claims (9)

A body holding part that is in the form of a strip or plate and that directly or indirectly contacts the seated person's body via a tension member and receives the seated person's load;
A frame portion for supporting the body holding portion;
A resin-integrated molding of a stretchable portion that is interposed between and connected between the end of the body holding portion and the frame portion and that expands or contracts the distance between the end portion of the body holding portion and the frame portion through elastic deformation. Provided ,
A backrest member that constitutes a backrest of a chair that supports a seated person's back without attaching a cushion to the front surface, with the resin stretchable portion not protruding forward from the front surface of the body holding portion . The backrest member according to claim 1, wherein the expansion / contraction portion has a shape that protrudes and retracts in the front / rear direction or the left / right direction, and has a hook shape that expands / contracts in the left / right, vertical / front / rear direction. The backrest member according to claim 1 or 2, wherein the elastic part has a higher elastic modulus than the body holding part and the frame part . A frame part is provided in a pair on the left and right sides, and a body holding part is provided in an area between them, and a left end part or a right end part of the body holding part is connected to the frame part via an extendable part. 3. The backrest member according to 3. A telescopic part is interposed between the body holding part that supports the back part of the seated person and the frame part, while an elastic part is not interposed between the body holding part that supports the waist part of the seated person and the frame part. Item 5. A backrest member according to item 1, 2, 3 or 4. The expansion / contraction part connected to the body holding part supporting the relatively upper part of the seated person's body has a more expandable / contractable amount than the expansion / contraction part connected to the body holding part supporting the relatively lower part of the seated person's body. The backrest member according to claim 1, 2, 3, 4 or 5. Provide a body holding part with the left end connected to the upper end of the left frame part and the right end connected to the upper end of the right frame part,
The backrest member according to claim 4, further comprising a connecting body that connects the left and right frame portions, the connecting body being bent or bent and spaced backward from the body holding portion. The frame part is provided as a pair in the vertical direction, and the body holding part is provided in an area between them, and the upper end part or the lower end part of the body holding part is connected to the frame part via the extendable part. 3. The backrest member according to 3. A chair having a backrest using the backrest member according to claim 1, 2, 3, 4, 5, 6, 7 or 8.

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