JP6755657B2 - Seat and chair - Google Patents

Description

The present invention relates to the structure of a chair seat.

Conventionally, in a chair, the fit of the seat to the buttocks is poor, so that the buttocks are not properly set when seated, which makes the sitting uncomfortable, or it is difficult to maintain a proper sitting posture and the sitting posture collapses. There was a problem. Further, particularly in a chair having a backrest, conventionally, there has been a problem that the buttocks slip forward when a seated person leans against the backrest.

Therefore, as a conventional chair seat structure for preventing the buttock of the seated person from slipping forward, as shown in FIG. 12, a flexible inner shell 101 and a urethane cushion 102 arranged on the inner shell 101 are used. The seat 100 is formed by wrapping the material with the skin material 103 on the upper surface of the rigid outer shell 104, and the rigid outer shell 104 is formed in a shape in which the vicinity of the buttocks of the seated person on the seat surface is recessed. In addition, there is a case in which the inner shell 101 having flexibility is made to follow the recessed shape of the outer shell 104 to exert the function of preventing forward slippage (Patent Document 1). In FIG. 12, reference numeral 105 represents a support base attached to the upper end of the leg body of the chair, and reference numeral 106 represents a back support rod to which the backrest is attached.

Japanese Unexamined Patent Publication No. 2014-090991

However, in the structure of the chair seat in Patent Document 1, it is necessary to dent the upper surface shape of the outer shell 104, and in order to form this dented shape, it is necessary to create the outer shell 104 by molding using a mold. There is a problem that mold costs are incurred. Further, a flexible inner shell 101 is also required, and the need for an inner shell 101 in addition to the outer shell 104 also leads to an increase in cost. Further, the inner shell 101 and the outer shell 104 have to be dedicated parts for a specific product, and there is a problem that the versatility is low.

Therefore, the present invention is a seat capable of improving the fit to the buttocks at the time of sitting and preventing the buttocks from slipping forward without requiring molding of the members constituting the outer shell of the seat of the chair. And to provide a chair with this seat.

In order to achieve such an object, the present invention relates to a chair seat in which the backrest support mechanism is configured to be swingable with respect to a support base and the backrest is locked. It has a cushion member arranged on the seat receiving member and a skin member covering at least the upper surface and the side surface of the cushion member, and the cushion member is a lower surface when the seated person is seated in a plan view. It has a flexure promoting portion formed in a part range including the buttocks position, and the seat support member has a flat upper surface shape, and the flexure promoting portion is a plan view of the lower surface of the cushion member. It is formed behind the center position in the front-back direction.

Therefore, according to this seat, since the cushion member has a bending promoting portion at the buttock position of the seated person, the buttock position portion of the cushion member is more likely to bend and dent than other portions, and the buttock portion sinks. As a result, the seated person's buttocks are suppressed from slipping forward to prevent forward slippage, and the fit to the buttocks when seated is improved to stabilize the sitting posture.

According to this seat, the seating position of the seated person is appropriate by adjusting the position and shape of the bending promoting portion (that is, the position in the front-rear direction and the left-right direction in the plan view of the seat surface). At the same time, the seat as a whole is properly supported by the buttocks of the seated person, and a proper seating posture is promoted and maintained.

Further, the molding seat receiving member is, because upper surfaces are flat, it is not necessary to recess the upper surface shape of the seat receiving member is a member that supports receiving the cushion member, member for supporting undergoing cushions member (seat receiving member) mold for the need and are such not.

Further, it flexures seen promoting portion is to be formed towards after the longitudinal central position in plan view of the lower surface of the cushion member, a suitable range to suppress the hip displacement forward of the seated person Is a part that easily bends and dents, and the front slip of the buttocks of the seated person is accurately prevented.

In the seat of the present invention, the bending promoting portion may also be a groove having a downward opening. In this case, a bending promoting portion is formed as a shape suitable for suppressing the forward displacement of the buttocks of the seated person and preventing forward slipping, although the shape is relatively simple and simple.

The seat of the present invention may also have a groove as a bending promoting portion which is a straight line whose longitudinal direction is along the left-right direction or a wavy shape which meanders and extends in the left-right direction in a plan view. In this case, the forward displacement of the buttocks of the seated person is appropriately suppressed, and the forward slip is accurately prevented.

In the seat of the present invention, the seat receiving member may also be composed of a single plate-shaped member. In this case, the seat receiving member is configured to be simple and inexpensive, and the seat, and thus the chair, is manufactured simply and inexpensively.

The seat of the present invention may also have a vent formed at a position of a bending promoting portion of the cushion member in a plan view of the seat receiving member. In this case, when the flexing promoting portion is deformed so as to be crushed by seating, the air in the flexing promoting portion is discharged from the vent, so that the air escape route is secured as a natural flow of air, so that the flexing is performed. The outflow of air from the promotion part is not hindered, and therefore the deformation of the cushion member is not hindered by the extension of the bending promotion part, and the air in the bending promotion part is transferred between the cushion member and the seating member. The generation of abnormal noise when the air is forcibly discharged through the space is prevented.

Further, the present invention is provided with the above-mentioned seat in a chair in which the backrest is locked . In this case, a chair in which the above-mentioned action of the seat is exhibited is realized.

According to the seat of the present invention and the chair provided with this seat, the buttocks, which is the fulcrum of the upper body that tilts and swings according to the locking of the backrest, fits the seat firmly, and in particular, pushes backward while leaning against the backrest. When the upper body is tilted backward, the displacement of the buttocks to the front is suppressed, the front slip is prevented, and the sitting posture can be stabilized, so that the sitting comfort is improved and the sitting comfort is extended. It is possible to improve the comfort of using the chair. Moreover, it is possible to easily bend only the buttock position without having two shells, an inner shell and an outer shell, and the seat configuration is simple, and the cost is low. However, it becomes possible to exert the above-mentioned action and effect.

According to the seat of the present invention and the chair provided with the seat, the seating position of the seated person is guided to an appropriate position by adjusting the mode of the bending promoting portion, and the seating person's buttocks support as a whole is appropriately supported. Since it is possible to promote and hold an appropriate sitting posture, it is possible to unknowingly realize a good sitting comfort and a sitting posture.

Further, since the upper surface shape of the seat receiving member is a flat, since the mold for molding the members (the seat receiving member) for supporting receiving a cushion member is not required, be made inexpensive fabrication costs of the seat Therefore, it is possible to provide a highly versatile seat and, by extension, a chair.

Further, by bending promotion portion is formed towards after the center position, forward sliding of the buttocks of the seated person as easily dent easily deflectable portion an appropriate range to suppress the displacement in the buttocks forward of the seated person Since it is possible to accurately prevent the sitting comfort, it is possible to improve the sitting comfort and the comfort of using the chair.

The seat of the present invention and the chair provided with this seat have a relatively simple and simple shape when the bending promoting portion is a groove of a downward opening, but the seated person's buttocks can be displaced forward. Since the bending promoting portion can be formed as a shape suitable for suppressing and preventing forward slippage, it is possible to improve the versatility as a seat and, by extension, as a chair.

When the seat of the present invention and the chair provided with the seat have a linear or wavy groove as a bending promoting portion, the seater's buttocks are appropriately suppressed from being displaced forward to prevent forward slippage. Since it can be prevented accurately, it is possible to improve the sitting comfort and the comfort of sitting, and by extension, the comfort of using a chair.

In the seat of the present invention and the chair provided with the seat, when the seat receiving member is composed of one plate-shaped member, the seat receiving member may be configured as a simple and inexpensive one and may be extended. Since the chair can be manufactured easily and inexpensively, it is possible to further improve the versatility as a seat and, by extension, as a chair.

In the seat of the present invention and the chair provided with this seat, when a vent is formed in the seat receiving member, the cushion member is deformed so that the outflow of air from the bending promoting portion is not hindered. It is possible to prevent the air from being hindered, so that the smooth deformation of the bending promoting part is ensured and the function is maintained well to maintain the comfort of sitting and the comfort of using the chair. In addition, it is possible to prevent the generation of abnormal noise when air is discharged by sitting, so that it is possible to ensure the comfort of sitting and the comfort of using a chair. ..

It is a figure explaining the structure of a seat together with the whole structure of a chair of an embodiment, and is the right side view of the state which disassembled a seat. It is a figure explaining the structure of the seat together with the whole structure of the chair of an embodiment, and is the perspective view seen from the diagonally front above in the state which disassembled the seat. It is a figure explaining the structure of a seat together with the whole structure of the chair of an embodiment, and is the perspective view seen from the lower side diagonally rearward in the disassembled state. It is a bottom view which shows an example of embodiment of the cushion member of the seat of this invention. It is a figure which looked at the cushion member of FIG. 4 from another viewpoint. (A) is a perspective view seen from diagonally below on the right side surface. (B) is a diagram showing a state in which (A) is cut in a vertical plane in the front-rear direction. It is a bottom view which shows an example of another embodiment of the cushion member of the seat of this invention. It is a figure which looked at the cushion member of FIG. 6 from another viewpoint. (A) is a perspective view seen from diagonally below on the right side surface. (B) is a diagram showing a state in which (A) is cut in a vertical plane in the front-rear direction. It is a bottom view which shows an example of still another embodiment of the cushion member of the seat of this invention. It is a figure which looked at the cushion member of FIG. 8 from another viewpoint. (A) is a perspective view seen from diagonally below on the right side surface. (B) is a diagram showing a state in which (A) is cut in a vertical plane in the front-rear direction. It is a bottom view which shows an example of still another embodiment of the cushion member of the seat of this invention. It is a figure which looked at the cushion member of FIG. 10 from another viewpoint. (A) is a perspective view seen from diagonally below on the right side surface. (B) is a diagram showing a state in which (A) is cut in a vertical plane in the front-rear direction. It is a figure explaining the structure of the seat of a conventional chair, and is the perspective view seen from the lower part diagonally rearward in the disassembled state.

Hereinafter, the configuration of the present invention will be described in detail based on an example of an embodiment shown in the drawings.

1 to 5 show an example of the seat of the present invention and an embodiment of a chair provided with the seat.

In the present embodiment, a case where the present invention is applied to a chair whose overall configuration is shown in FIGS. 1 to 3 will be described as an example.

Further, in the description of the present invention, "upper" and "lower", "front" and "rear", and "left" and "right" are defined (in other words) with reference to the seated person sitting on the chair. Means "upper" and "lower", "front" and "rear", and "left" and "right" when viewed from the seated person).

The chair of the present embodiment is provided on the support base 10 attached to the upper end of the pedestal 18 standing on the leg base 17 of the leg blade type, the seat 1 supported by the support base 10, and the support base 10. It has a backrest support mechanism 11 and a backrest 15 attached to and supported by the backrest support mechanism 11.

The leg blade type leg base 17 is arranged so that the integrally molded leg base 17a and the respective base ends are connected to the leg base 17a and the longitudinal direction is along the radial direction centered on the leg base 17a. It has a plurality of leg blades 17b to be provided.

In the present embodiment, five leg blades 17b are arranged radially, and casters 19 are provided on the lower surface of each tip portion. That is, the chair of the present embodiment includes a leg body in a mode called a so-called rotating leg. However, it is not an essential configuration in the present invention that the leg blades 17b are provided with casters 19, and further, it is an essential configuration in the present invention to have a leg blade type leg base 17 as a part of the leg body. Absent. That is, the specific shape and mode of the legs of the chair to which the present invention can be applied are not limited to specific ones, and appropriate ones are appropriately selected in consideration of the use and design of the chair.

The leg base 17a at the center of the leg base 17 is provided with a through hole having a circular cross section (in other words, in a plan view) in the vertical direction, and the pedestal 18 is fitted and fixed to the through hole.

In the present embodiment, the pedestal 18 is mainly composed of a gas spring having a cylinder 18a and a rod 18b that can move up and down with respect to the cylinder 18a, and the cylinder 18a is fitted into a through hole provided in the leg base 17a. The pedestal 18 (that is, the gas spring) is fixed to the leg base 17 by being fixed.

Further, the support base portion 10 is attached to the tip end portion (in other words, the upper end portion) of the gas spring rod 18b as the pedestal 18.

The support base 10 is attached to the upper end of the pedestal 18, supports the seat 1 and supports the backrest 15 via the backrest support mechanism 11, and covers the base portion 10A and the base portion 10A. It has an upper cover portion 10B to be covered with.

The bottom of the base portion 10A is provided with a through hole for penetrating the upper end portion of the pedestal 18 (specifically, the tip portion of the rod 18b of the gas spring in the example shown in the figure).

Then, in a state where the tip portion of the rod 18b has entered the support base portion 10 through the through hole, the base portion 10A is fixed and attached to the tip portion of the rod 18b, so that the support base portion 10 is attached to the pedestal 18. It is attached to.

An operation button for locking and unlocking the gas spring is provided at the tip of the rod 18b of the gas spring. The operation button is operated so as to be pushed in or released by an elevating operation lever (not shown) swingably attached to the support base 10. Then, by operating the lifting / lowering operation lever, it is possible to raise / lower the seat 1 together with the support base 10 in the state where the gas spring is unlocked, while the support base is in the state where the gas spring is locked. The height positions of 10 and the seat 1 are fixed.

The upper cover portion 10B has a top plate 10c and a pair of left and right side walls 10d and 10d extending downward from each of the left and right edge portions of the top plate 10c.

The top plate 10c of the upper cover portion 10B is provided with a seat plate fixing portion 10e extending toward the left and right sides and having through holes in the vertical direction at each of the four front, rear, left, and right corners in a plan view.

On the lower surface side of the top plate 10c of the upper cover portion 10B, a pair of left and right fixing members 14 and 14 are attached to each of the pair of left and right side walls 10d and 10d.

The pair of left and right fixing members 14, 14 are each formed in an elongated plate shape and arranged so that the longitudinal direction is along the front-rear direction, and the front end portion is attached to the side wall 10d of the upper cover portion 10B.

Further, a backrest support mechanism 11 is arranged between the pair of left and right fixing members 14, 14, and the rear end portion of each fixing member 14 is connected to the backrest support mechanism 11.

The backrest support mechanism 11 is for supporting the backrest 15 by the support base 10 via itself, and is a back support rod 12 formed of a relatively thick steel plate or the like, and the back support rod 12 of the back support rod 12. It has a back support rod mounting member 13 for connecting the front end portion and the support base portion 10.

The back support rod 12 has a fixing portion 12a extending forward and a supporting portion 12b connecting with the rear end portion of the fixing portion 12a and extending upward. With this configuration, the back support rod 12 is formed in an L-shape (or an L-shape that is reversed left and right) in a lateral view.

The back support rod mounting member 13 has a rectangular bottom plate 13a in a plan view, and a pair of left and right side walls 13b and 13b extending upward from each of the left and right edge portions of the bottom plate 13a.

A fixing portion 12a extending forward of the back support rod 12 is attached to the upper surface of the bottom plate 13a of the back support rod attachment member 13.

Further, the backrest 15 is fixedly attached to the support portion 12b extending upward in the back support rod 12.

Further, the front end portions of the left and right side walls 13b and 13b of the back support rod mounting member 13 and the rear end portion of the base portion 10A of the support base portion 10 can be swung by the first shaft member arranged in the left-right direction. Along with being connected, the rear ends of the left and right fixing members 14 and 14 attached to the upper cover portion 10B and the left and right side walls 13b and 13b of the back support rod attaching member 13 are arranged in the left-right direction. The back support rod attachment member 13 of the backrest support mechanism 11 is attached to the support base 10 by being swingably connected by the two shaft members.

Further, the upper cover portion 10B and the base portion 10A are connected via a rotation shaft arranged in the left-right direction, and the upper cover portion 10B is swingably attached to the base portion 10A. One shaft member and the second shaft member are arranged so as to act as a rotation shaft.

With the above configuration, the backrest support mechanism 11 is configured to be swingable with respect to the support base 10, the backrest 15 is locked (tilting operation, swinging operation), and the backrest support mechanism 11 and the left and right sides are rocked. The seat 1 is configured to tilt together with the upper cover portion 10B in synchronization with the locking of the backrest 15 via the pair of fixing members 14, 14.

However, it is not essential in the present invention that the seat 1 and the backrest 15 are synchronized and locked, and the seat 1 and the backrest 15 may be configured to be locked separately, and the seat 1 may be locked separately. It may be configured so that only one of the seat 1 and the backrest 15 is locked, and further, neither the seat 1 nor the backrest 15 may be locked.

The mechanism (specific structure) for synchronizing the seat 1 and the backrest 15 for locking is not limited to the above-mentioned mechanism, and other mechanisms may be used. Further, the mechanism for locking the seat 1 and the backrest 15 separately or for locking only one of them is not limited to a specific mechanism, and an appropriate one is appropriately selected.

On the other hand, the seat 1 has a seat receiving member 7, a cushion member 2 arranged on the seat receiving member 7, and a skin member 8 covering at least the upper surface and the side surface of the cushion member 2, and cushions the seat 1. The member 2 has a flexure promoting portion 3 formed in a part of the lower surface 2a including the position of the buttocks when the seated person is seated in a plan view.

The seat support member 7 is arranged on the upper cover portion 10B of the support base portion 10 and supports the cushion member 2 arranged on the upper surface side of the support base portion 10.

The seat receiving member 7 is attached to the seat plate fixing portion 10e of the upper cover portion 10B by a fastener / joining tool such as a screw, whereby the seat receiving member 7 is fixed and attached to the support base portion 10.

The shape of the seating member 7 is limited to a specific shape as long as the upper surface side has at least a portion that supports the cushion member 2 and the lower surface side has at least a portion that can be attached to the support base portion 10. Not done.

Then, in the present invention, even if the upper surface shape of the seat receiving member 7 is not recessed, in other words, even if it is flat, the cushion member 2 is fitted to the buttocks by the action of the bending promoting portion 3. It is possible to improve the sexuality and prevent the buttocks from slipping forward.

It goes without saying that the flatness relating to the upper surface shape of the seat member 7 includes a state of being completely flat (that is, a completely flat surface over the entire surface), but is limited to a state of being completely flat. It also includes a state in which it is generally flat.

Then, in the present invention, when the upper surface shape of the seat receiving member 7 is "generally flat", it is gradually (in other words, monotonous) from the central portion to the edge portion in either the front-rear direction or the left-right direction. Including a shape that rises or falls (in other words, is curved), and specific examples thereof include the following forms.

i) In the front-rear direction, it is straight without bending, and in the left-right direction, it gradually rises from the left-right center to the left-right side edges and bends upward.
ii) In the front-back direction, it is straight without bending, and in the left-right direction, it gradually descends from the left-right center to the left-right side edges and bends downward.
iii) In the left-right direction, it is straight without bending, and in the front-rear direction, it gradually rises from the front-rear center to the front-rear side edges and bends upward.
iv) In the left-right direction, it is straight without bending, and in the front-rear direction, it gradually descends from the front-rear center to the front-rear side edges and bends downward.

Further, the front edge portion of the seating member 7 is warped downward (in other words, hangs down) so as to reduce the strength of contact with the back side of the thigh of the seated person, or the seating member 7 The form in which the edge portion has a convex portion protruding upward so as to fit with the cushion member 2 is also included in the "state in which the upper surface shape of the seat receiving member 7 is substantially flat" in the present invention.

For example, in the example shown in the figure, the upper surface of the seating member 7 has a shape that gradually rises from the left and right center portion to the left and right both side edges in the left-right direction and is curved by warping upward, but in the front-rear direction. In, for example, the part of the buttock position of the seated person at the time of sitting is not dented more than the other parts and is straight. Therefore, the upper surface shape of the seating member 7 in the example shown in the figure satisfies the flatness requirement in the present invention.

The material of the seating member 7 is not limited to a specific type, and an appropriate material is appropriately selected in consideration of, for example, the required strength in consideration of the intended use. That is, the present invention can be applied without being restricted by the material of the seat member 7.

The seat receiving member 7 may be formed of a single flat plate (including plywood), for example, when the upper surface shape is to be completely flat.

The cushion member 2 is formed of an elastic member and is arranged on the seat receiving member 7. The cushion member 2 is directly installed on the upper surface of the seat support member 7 without interposing another component or member between the cushion member 2 and the seat support member 7.

The material of the cushion member 2 is not limited to a specific type as long as it has elasticity and can be formed into an arbitrary shape. For example, the elastic force exerted and the ease of forming process are taken into consideration. After that, an appropriate one is appropriately selected. Specifically, for example, urethane (either molded urethane or slab urethane may be used) may be selected as the material of the cushion member 2.

The flexure promoting portion 3 of the cushion member 2 is for making a specific portion of the cushion member 2 more easily flexed than other portions, and sinks the buttocks of the seated person to prevent the buttocks from shifting forward. As described above, it is provided in a range of the lower surface 2a of the cushion member 2 including the buttocks position when seated on the seat 1 in a plan view.

The specific structure of the bending promoting portion 3 is not limited to a specific configuration / mode as long as the portion is more likely to bend than other portions, and various configurations / modes are appropriately selected. To.

For example, the lower surface 2a of the cushion member 2 is provided with irregularities, and the range corresponding to the bending promoting portion 3 is provided with more spaces (in other words, cavities and voids) than other portions, so that the portion as the bending promoting portion 3 is provided. May be configured to be more flexible than other parts, or a material in which the range corresponding to the bending promoting portion 3 of the lower edge portion of the cushion member 2 is more easily bent than other parts (in other words, By being made of a soft material), the portion as the bending promoting portion 3 may be configured to be more easily bent than other portions.

Further, the range of the bending promoting portion 3 is not limited to a specific range in the plan view of the seat 1, and the seating at the time of sitting is taken into consideration in consideration of the shape of the entire seat 1 and the expected usage mode. Based on the position of the buttocks of the person, an appropriate range is appropriately set to sink the buttocks and suppress the forward displacement.

Specifically, for example, the range of the bending promoting portion 3 is set to a range behind the central position in the front-rear direction in the plan view of the lower surface 2a of the cushion member 2. In this case, the space (cavity, void) as the bending promoting portion 3 is formed only behind the front-rear center position of the lower surface 2a of the cushion member 2, or the front-rear side is compared with the front-rear center position. More space may be formed behind the central position.

When the bending promoting portion 3 is provided with unevenness only in the range behind the center position in the front-rear direction in the plan view of the lower surface 2a of the cushion member 2, specifically, for example, FIGS. 4 and 5 show. As shown, a linear groove 4 may be formed.

In the examples shown in FIGS. 4 and 5, six (six) cushion members 2 have their longitudinal directions along the left-right direction only in the range behind the center position in the front-rear direction in the plan view of the lower surface 2a. The bending promoting portion 3 is formed by forming the linear grooves 4 of the above in the front-rear direction.

The bending promoting portion 3 may be formed by arranging a plurality of linear grooves whose longitudinal directions are along the front-rear direction in the left-right direction, and the longitudinal direction is the left-right direction or the front-rear direction. Only one (one) linear groove may be formed along the line. In addition, when a plurality of linear grooves are formed, the depths of the grooves may be the same or different.

When the bending promoting portion 3 is provided with unevenness only in the range behind the central position in the front-rear direction in the plan view of the lower surface 2a of the cushion member 2, as shown in FIGS. 6 and 7. The wavy groove 5 may be formed.

In the examples shown in FIGS. 6 and 7, each of the lower surface 2a of the cushion member 2 meanders and extends in the left-right direction only in the range behind the center position in the front-rear direction in the plan view (in other words, each of them). The bending promoting portion 3 is formed by forming the three (three) wavy grooves 5 (the longitudinal direction is along the left-right direction) so as to be arranged in the front-rear direction.

The deflection promoting portion 3 is formed so that a plurality of wavy grooves each extending in the front-rear direction while meandering (in other words, each longitudinal direction is along the front-rear direction) are arranged in the left-right direction. Alternatively, only one (one) wavy groove extending in the left-right direction or the front-back direction while meandering may be formed. In addition, when a plurality of wavy grooves are formed, the depths of the grooves may be the same or different.

When the bending promoting portion 3 is provided with unevenness only in the range behind the central position in the front-rear direction in the plan view of the lower surface 2a of the cushion member 2, as shown in FIGS. 8 and 9, further, as shown in FIGS. A groove 6 having a shape (specifically, generally a forward concave shape) that imitates the contour of the buttocks including the base portion of the thigh may be formed.

In the examples shown in FIGS. 8 and 9, three grooves 6A and 6B, each of which has a concave shape that is generally forward, are formed only in the range behind the center position in the front-rear direction in the plan view of the lower surface 2a of the cushion member 2. , 6C are formed. Specifically, in the bending promoting portion 3, the outer peripheral portion of the inner concave groove 6A is surrounded by the central concave groove 6B, and the outer peripheral portion of the central concave groove 6B is surrounded by the outer concave groove 6C. It is constructed by forming a triple groove by surrounding it.

In the examples shown in FIGS. 8 and 9, the central concave groove 6B is formed as a deeper groove than the outer concave groove 6C, and is formed inside the central concave groove 6B. The concave groove 6A is formed as a deeper groove. Therefore, the flexure promoting portion 3 is formed so as to gradually bend more easily from the outer (outer circumference) portion to the inner (center) portion of the buttocks when seated, whereby the cushion member 2 fits on the buttocks when seated. The sexuality is improved and the sitting posture is stable. However, the depths of the grooves 6A, 6B, and 6C may be the same.

As the bending promoting portion 3, only one (single) concave groove that is generally forward facing may be formed.

Hemispherical or pyramidal concave portions may be formed on the lower surface 2a of the cushion member 2 as unevenness as the bending promoting portion 3, or hemispherical or pyramidal convex portions. (In other words, a concave portion that is connected so that a hemispherical or cone-shaped convex portion remains) may be formed.

In the examples shown in FIGS. 10 and 11, the lower surface 2a of the cushion member 2 is bent by forming a plurality of hemispherical recesses 9 from the central portion in the front-rear direction to the rear range in the plan view. The promotion unit 3 is configured.

In the examples shown in FIGS. 10 and 11, a total of 45 hemispherical recesses 9 arranged in 9 columns in the front-rear direction and 5 rows in the left-right direction are arranged at equal intervals at the center position, but are bent. The number and arrangement of the hemispherical recesses 9 as the promoting portion 3 are not limited to those shown in FIGS. 10 and 11.

In the examples shown in FIGS. 10 and 11, the hemispherical recess 9 is formed so that the size and depth (that is, the radius as a sphere) gradually increase and deepen from the outer portion to the central portion. Radius. Specifically, the hemispherical recess 9B at the center position in the left-right lateral front-back direction and the hemispherical recess 9C at the center position in the front-rear lateral left-right direction are larger and deeper than the hemispherical recess 9D at the corner. The hemispherical recesses 9A at the center positions of the front, back, left, and right are larger and deeper than the hemispherical recesses 9B and 9C. Therefore, the flexure promoting portion 3 is formed so as to gradually bend more easily from the outer (outer circumference) portion to the inner (center) portion of the buttocks when seated, whereby the cushion member 2 fits on the buttocks when seated. The sexuality is improved and the sitting posture is stable. However, the size and depth of each of the hemispherical recesses 9 (9A, 9B, 9C, 9D) may be the same.

It should be noted that the linear groove 4 as shown in FIGS. 4 and 5, the wavy groove 5 as shown in FIGS. 6 and 7, and the concave groove 6 (6A, 6B, as shown in FIGS. 8 and 9). 6C), and two or more of hemispherical recesses 9 (9A, 9B, 9C, 9D) as shown in FIGS. 10 and 11 or hemispherical protrusions or cone-shaped recesses or protrusions. Grooves, recesses, and protrusions according to the above embodiment may be used in combination.

Further, for example, irregularities such as various grooves 4, 5 and 6 in the examples shown in FIGS. 4 to 9 and hemispherical or pyramidal irregularities such as recesses 9 in the examples shown in FIGS. 10 and 11 are formed. Recesses provided on the lower surface 2a of the cushion member 2 (for example, grooves 4, 5, 6 or hemispherical recesses 9 or cone-shaped recesses, or around hemispherical or cone-shaped protrusions. The depth of the concave portion) is not limited to a specific value, and is appropriately set to an appropriate value after considering, for example, the softness of the cushion member 2 and the ease of bending to be expressed as the bending promoting portion 3. Set. However, it is preferable that the remaining thickness of the cushion member 2 in the portion where the recess is formed is approximately 45 mm or more, specifically, the depth of the recess such as a groove is 8 to 12 mm and the position of the recess. It is one of the preferable examples that the remaining thickness of the cushion member 2 is set to about 45 mm (therefore, the total thickness of the cushion member 2 is about 53 to 57 mm).

Here, a vent (not shown) may be provided in the seat receiving member 7 on which the cushion member 2 is arranged on the upper surface side.

The vent is formed as a hole that penetrates the seat receiving member 7 in the vertical direction in a region of the seat receiving member 7 that corresponds to the range of the bending promoting portion 3 of the cushion member 2 in a plan view. In particular, when the lower surface 2a of the cushion member 2 is provided with irregularities as the bending promoting portion 3, a hole penetrating the seat receiving member 7 is ventilated at the position of the concave portion in a plan view, in other words, so as to communicate with the concave portion. Formed as a mouth.

Specifically, for example, in the case of the examples shown in FIGS. 4 and 5, each groove 4 in a plan view corresponds to each of the linear grooves 4 as recesses provided on the lower surface 2a of the cushion member 2. At the position, in other words, a hole penetrating the cushion member 7 is formed as a vent so as to communicate with each groove 4.

Due to the formation of the vent in the seat member 7, when the flexure promoting portion 3 is deformed so as to be crushed by seating, the inside of the flexure promoting portion 3 (in the groove 4 in the examples shown in FIGS. 4 to 11). Since the air in the groove 5 (inside the groove 5, in the groove 6 or in the recess 9) is discharged from the vent, the air flows out from the bending promoting portion 3 because an escape route for the air is secured as a natural flow of the air. It is not hindered, and therefore the deformation of the bending promoting portion 3 and thus the cushion member 2 is not hindered. Therefore, the smooth deformation of the cushion member 2 including the bending promoting part 3 is ensured, and the function of the bending promoting part 3 that it is easier to bend than other parts is maintained satisfactorily.

By forming the vent in the seat member 7, the air in the flexure promoting portion 3 is discharged from the vent when the flexing promoting portion 3 is deformed so as to be crushed by the seating. Since an air escape route is secured as a natural flow, it is impossible for the air in the bending promoting portion 3 to flow between the cushion member 2 and the seat receiving member 7 (it is assumed that both are in surface contact). The generation of abnormal noise when being discharged through the air is prevented, and therefore the generation of abnormal noise when sitting is prevented.

The skin member 8 wraps and covers the cushion member 2, and may cover at least the upper surface and the side surface of the cushion member 2.

The skin member 8 may also wrap a part (specifically, for example, a peripheral portion) of the seat receiving member 7 on which the cushion member 2 is placed on the upper surface. However, it is not an essential configuration in the present invention that a part of the seat receiving member 7 is also wrapped by the skin member 8, only the cushion member 2 is wrapped by the skin member 8, and the seat receiving member 7 is the skin. Depending on the member 8, it may not be wrapped.

In the example shown in the figure, the skin member 8 is formed in a bag shape according to the shape of the cushion member 2 (and the seat member 7), and the seat member 7 is formed on the lower surface side (that is, in the assembled state as the seat 1). An opening is provided on the side).

Then, the skin member 8 is put on the cushion member 2 (and the peripheral edge of the seat receiving member 7) while taking in the cushion member 2 (and the peripheral edge of the seat receiving member 7) from the opening on the lower surface side. Can be attached.

The material of the skin member 8 is not limited to a specific type, and an appropriate material is appropriately selected in consideration of, for example, the required strength in consideration of the intended use. That is, the present invention can be applied without being restricted by the material of the skin member 8.

According to the seat 1 having the above configuration and the chair provided with the seat 1, since the cushion member 2 has the bending promoting portion 3 at the buttock position of the seated person, the buttock position portion of the cushion member 2 is other than the seat 1. It is easier to bend and dent than the part of the chair, and the buttocks sink, so that the seated person's buttocks can be prevented from slipping forward and the fit to the buttocks when seated can be improved. It is possible to improve and stabilize the sitting posture, improve the sitting comfort, improve the sitting comfort, and extend the comfort of using the chair. Moreover, it is possible to easily bend only the part at the buttocks position without having two shells, an inner shell and an outer shell, and the seat configuration is simple, and the cost is low. However, it becomes possible to exert the above-mentioned action and effect.

According to the seat 1 having the above configuration and the chair provided with the seat 1, the seating position of the seated person is guided to an appropriate position by adjusting the mode of the bending promoting portion 3, and the seated person as a whole seat. Since it is possible to properly support the buttocks and promote and hold an appropriate sitting posture, it is possible to unknowingly realize a good sitting comfort and a sitting posture.

According to the seat 1 having the above configuration and the chair provided with the seat 1, since the seat receiving member 7 having a flat upper surface shape is used, the seat receiving member which is a member for receiving and supporting the cushion member 2. Since it is not necessary to dent the upper surface shape of the member 7, and therefore a mold for molding the member (seat member 7) that supports the cushion member 2 is not required, no mold making cost is incurred, so that the seat is manufactured. The cost can be reduced, and it becomes possible to provide a highly versatile seat and, by extension, a chair.

Although the above-described embodiment is an example of a suitable mode for carrying out the present invention, the embodiment of the present invention is not limited to the above-mentioned one, and the present invention is not limited to the above-mentioned embodiment and does not deviate from the gist of the present invention. The invention can be modified in various ways.

For example, in the above-described embodiment, the present invention is applied to a chair whose overall configuration is shown in FIGS. 1 to 3, but the specific shape and mode of each component of the chair to which the present invention can be applied are. The chair is not limited to the above-described embodiment, and an appropriate chair is appropriately selected based on the use and design of the chair. Specifically, as long as the seat 1 including the cushion member 2 is attached and fixed, that is, the chair has at least a configuration corresponding to the support base 10 in the above-described embodiment, the mode of the chair and each component member It does not matter what the shape is.

1 Seat 2 Cushion member 2a Bottom surface 3 Flexion promotion part 4 Straight groove 5 Wavy groove 6 (6A, 6B, 6C) Concave groove 7 Seat receiving member 8 Skin member 9 (9A, 9B, 9C, 9D) Hemisphere Body-shaped recess 10 Support base 10A Base 10B Top cover 10c Top plate 10d Side wall 10e Seat plate fixing part 11 Backrest support mechanism 12 Back support rod 12a Fixing part 12b Support part 13 Back support rod mounting member 13a Bottom plate 13b Side wall 14 Fixing member 15 Backrest 17 Leg base 17a Leg base 17b Leg blade 18 Leg column 18a Cylinder 18b Rod 19 Caster

Claims (6)

In a chair seat where the backrest is configured so that the backrest support mechanism is swingable with respect to the support base and the backrest is locked.
The seat has a seat receiving member, a cushion member arranged on the seat receiving member, and a skin member covering at least the upper surface and the side surface of the cushion member, and the cushion member is on the lower surface. It has a flexure promoting portion formed in a part including the position of the buttocks when the seated person is seated in the plan view of the above, and the seating member has a flat upper surface shape.
A seat characterized in that the bending promoting portion is formed behind the central position in the front-rear direction in a plan view of the lower surface of the cushion member. The seat according to claim 1, wherein the bending promoting portion is a groove having a downward opening. The seat according to claim 2, wherein the groove is a straight line whose longitudinal direction is along the left-right direction or a wavy shape which meanders and extends in the left-right direction in a plan view. The seat according to claim 1, wherein the seat receiving member is composed of a single plate-shaped member. The seat according to claim 1, wherein a vent is formed at a position of the bending promoting portion of the cushion member in a plan view of the seat member. A chair with a rocking backrest, which comprises the seat according to any one of claims 1 to 5.