JP6327598B2 - Chair - Google Patents

Description

  The present invention relates to a chair having a backrest.

As a chair used for office work or the like, there is a structure in which a back support for receiving a load on a back of a seated person is supported on the front side of a back support connected to a chair main body.
As this type of chair, there is known a chair in which a portion spaced downward from the upper end of a back support is supported by a back support so as to be swingable (see, for example, Patent Documents 1 and 2).
Since this chair has a free end at the upper end side of the back receiving body that receives the load on the back of the seated person, there is an advantage that the seated person can easily take a comfortable posture when the back is greatly bent backward. On the other hand, in this chair, when the seated person makes his / her back contact with the back support, the head tends to tilt backward, and it is difficult to assume a working posture with the head slightly tilted forward.

On the other hand, as a chair suitable for maintaining the office posture, a chair in which the upper end portion of the back support body is connected to the upper end portion of the back support body has been devised (see, for example, Patent Documents 3 and 4). ).
In this chair, the upper end portion of the back support is fixed to the back support, and the lower position is more easily displaced to the rear side than the upper end of the back support. For this reason, when the shoulder part of the seated person touches the position slightly below the upper end part of the back support, the part of the back contact that is in contact with the shoulder of the seated person is deformed rearward, and the head of the seated person It becomes easy to take a working posture that is pushed forward relatively.

Japanese Patent No. 5132919 JP 2010-063821 A JP 2011-092537 A Japanese Patent No. 4663220

By the way, the chairs of the types described in Patent Documents 1 and 2 are moved by gripping the chair because the back support and the back support are connected to each other at a position spaced apart from the upper end by a predetermined distance. For example, the upper side of the back support can be easily grasped as a handle.
However, in the chairs of the types described in Patent Documents 3 and 4, since the back support and the back support are joined in contact with each other at their upper ends, the upper side of the back support is used as a handle. Even so, there is no gap for allowing the fingertip to enter the front side of the back support, and it is difficult to stably grip the upper portion of the chair.

  Accordingly, the present invention is intended to provide a chair that can be easily used as a handle while having a structure in which the upper ends of the back support and the back support are coupled to each other.

A chair according to the present invention includes a back support that receives a load on a back of a seated person, and a back support that is disposed on the back side of the back support and supports the back support. In a chair including a backrest portion in which an upper end portion of a receiver and an upper end portion of the back support are coupled to each other, a lateral beam portion extending in the left-right direction is provided on the upper end of the back support. The front surface of the cross beam portion is formed with an engagement recess that can be engaged with an engagement protrusion provided on the back support, and the lower surface of the cross beam portion is below the engagement recess and the cross beam. It is characterized in that a recessed portion that is recessed upward is allowed to allow insertion of a fingertip when the portion is gripped.
In the case of this invention, when moving a chair, etc., the upper part of the back support is easily and stably gripped by inserting a fingertip into the recess on the lower surface of the cross beam part of the back support. It becomes possible.

It is preferable that the horizontal beam portion is formed in a cross-sectional shape in which a rear surface and the lower surface form an acute angle.
In this case, when the thumb is hung on the upper side and the other fingers are turned to the side of the indentation on the lower surface of the cross beam portion, the joint of the other finger is applied with an acute angle between the rear surface and the lower surface of the cross beam portion. It can be bent at a natural angle that is easy to insert.

Moreover, it is desirable that a stepped portion that is recessed upward is provided on the lower surface of the transverse beam portion on the front side of the opening edge of the recessed portion.
In this case, even if the fingertip of a person who is trying to put a finger into the hollow portion in order to grasp the cross beam portion of the back support is inserted in front of the hollow portion, the hollow portion is located in front of the hollow portion. Since the step portion that is recessed upward is provided with respect to the opening edge, the cross beam portion can be easily grasped by placing a finger on the wall of the step portion.

A support portion for additional functional parts attached to the cross beam portion may be provided on the rear surface of the cross beam portion.
In this case, even when the additional functional component is attached to the cross beam portion, the addable component is supported by the rear surface of the cross beam portion, so that the depression on the lower surface side of the cross beam portion may be blocked by the additional functional component. In addition, the horizontal beam portion can be easily grasped by placing the fingertip on the hollow portion.

  According to the present invention, the lower surface of the lateral beam portion of the back support body is provided with a recess that allows insertion of a fingertip of a person holding the horizontal beam portion, so that the upper ends of the back support body and the back support body Although the parts are coupled to each other, the upper end portion of the back support can be easily and stably gripped using the handle.

It is a side view of the chair of one Embodiment of this invention. It is a top view of the chair of one Embodiment of this invention. It is a rear view of the chair of one Embodiment of this invention. It is a back side perspective view of the chair of one embodiment of this invention. It is the perspective view which looked at the backrest part of the chair of one Embodiment of this invention from the rear lower part. It is the perspective view which looked at the backboard of the chair of one Embodiment of this invention from the rear lower part. It is the perspective view which looked at the back board support frame of the chair of one Embodiment of this invention from the front lower part. It is sectional drawing corresponding to the VIII-VIII cross section of FIG. 5 of the chair of one Embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, the direction indicated by the arrow FR in the figure facing the front of the person seated in the chair in a regular posture is referred to as “front”, and the opposite direction is referred to as “rear”. For “upper”, “lower”, “left”, and “right”, the direction indicated by the arrow UP in the figure above the person sitting on the chair in a regular posture is “up” and the opposite direction is “ The direction indicated by the arrow LH on the left side of the person seated in a normal posture on the chair is called “left”, and the direction opposite to that is called “right”.

1 and 2 are a side view and a plan view of the chair 1 of this embodiment, and FIGS. 3 and 4 are a rear view and a rear side perspective view of the chair 1 of this embodiment.
As shown in these drawings, a chair 1 according to this embodiment includes a leg 2 placed on a floor, a box-like support base 3 installed at the upper end of the leg 2, and a seated person. A seat body 4, a seat receiving member 5 that is attached to the upper surface of the support base 3 and supports the seat body 4, and a back that extends from the support base 3 to the rear upper side and seats on the seat body 4. And a drowning part 50. In this embodiment, the leg part 2, the support base 3, the seat receiving member 5, and the seat body 4 constitute a chair body part.

  The leg 2 includes a multi-leg 9 with casters 9a and a pedestal 10 that has a gas spring as a lifting mechanism that stands up from the center of the multi-leg 9 and has a support base 3 at the upper end of the pedestal 10. Is mounted so as to be rotatable in the horizontal direction. The support base 3 incorporates an elevation adjustment mechanism for the pedestal column 10 and a tilt adjustment mechanism for the backrest 50.

  The seat body 4 includes a seat plate 13 that forms a skeleton portion, and a seat body 14 that is attached to the upper portion of the seat plate 13. The seat body 14 is not shown in detail, but a seat frame (not shown) attached to the outer peripheral edge of the seat plate 13 and a cushion material (not shown) made of urethane or the like installed on the upper surface of the seat plate 13. And a synthetic resin tension material 15 that is stretched on the seat frame and covers the upper side of the cushion material.

The backrest portion 50 has a front end connected to a tilt adjustment mechanism in the support base 3, a connection stay 17 extending from the rear end portion of the support base 3 toward the oblique rear upper side, and a rear end of the connection stay 17. A rectangular frame-shaped back support 7 connected to the support stay 17 and extending upward from the connection stay 17, and a back of a seated person seated on the seat 4 supported by the front side of the back support 7 And a back support 6 for supporting the. Since the back support 7 is a strength component for supporting the load of the back of the seated person input to the back support 6 on the chair main body side via the connecting stay 17, the rigidity and strength are sufficient. It is made of high synthetic resin.
In FIG. 1, reference numeral 11 is a pivot shaft of the backrest portion 50 on the support base 3, and reference numeral 12 is an operation knob of a tilt adjustment mechanism protruding from the side surface of the support base 3.

  The back support 6 of the backrest 50 includes a vertically long rectangular frame-shaped back plate frame 18 and a tension member 19 stretched on the back plate frame 18 so as to cover the opening 18d inside the back plate frame 18. And. The back plate frame 18 is integrally formed of a synthetic resin having elasticity, and the tension member 19 is formed by knitting a synthetic resin fiber having stretchability into a mesh shape. The tension member 19 is stretched on the back plate frame 18 with a relatively high tension, and comes into contact with the back of the seated person sitting on the seat body 4 so as to directly receive the load on the back of the seated person. Note that the outer peripheral end portion of the upholstery material 19 is locked and fixed by appropriate means in a holding groove (not shown) formed on the outer peripheral end surface of the back plate frame 18.

FIG. 5 is a view showing the upper half of the backrest portion 50, and FIG. 6 is a view showing the upper half of a single body of the back support 6. FIG. 7 is a view showing the upper half part of the back support 7 and FIG. 8 is a view showing a cross section corresponding to the VIII-VIII cross section of the backrest part 50 of FIG. 5, 6, and 8, the tension member 19 attached to the back plate frame 18 of the back support 6 is omitted for convenience of illustration.
As shown in these drawings, the back plate frame 18 of the back support 6 is formed in a substantially rectangular shape with rounded four corners when viewed from the front, and 3 minutes from the bottom in the height direction when viewed from the side. Is curved so that the height position of about 1 bulges most forward. The upper side 18a of the back plate frame 18 is greatly inclined so as to approach the horizontal direction toward the upper rear side. Further, as shown in FIG. 2, the back plate frame 18 is curved so that a central region in the left-right direction is slightly recessed rearward in plan view. The most bulging area on the front side of the back plate frame 18 is set to an area that supports the vicinity of the waist of the seated person sitting on the seat 4. Hereinafter, the most bulging portion on the front side of the back plate frame 18 is referred to as a “front bulging portion 20”.
Further, the front surface of almost the entire peripheral edge of the back plate frame 18 is smoothly inclined toward the rear side from the inside to the outside of the opening 18d.

On the other hand, the back support 7 is formed in a vertically long, substantially rectangular frame shape with the lower side slightly narrowed in the rear view (front view). More precisely, as shown in FIG. 3, the upper half portions of the left and right side sides 7c (vertical beam portions) extend in the vertical direction so as to be substantially parallel to each other, and the left and right side sides 7c (vertical beam portions). The lower half is inclined so that the separation width gradually decreases downward. The upper ends of the left and right side sides 7c are connected by an upper side 7a extending substantially horizontally in the left-right direction, and the lower ends of the left and right side sides 7c are lower sides having a shorter extension length than the upper side 7a. 7b. The upper side 7a and the lower side 7b of the back support 7 are formed in a thick block shape, and the left and right side sides 7c are formed in a thin plate shape. In this embodiment, the upper side 7 a constitutes a transverse beam portion at the upper end portion of the back support 7.
As shown in FIG. 5 and FIG. 7, the left and right side sides 7 c extend such that the side body portion 7 c-1 is inclined forward from the inner side in the width direction toward the outer side. Reinforcing ribs 7c-2 projecting forward are provided on the part.

  The back plate frame 18 of the back support 6 is fixed to the back support 7 at three places spaced apart in the left-right direction of the upper side 18a and one place at the center of the lower side 18b. Specifically, as shown in FIG. 3, the upper side 18 a of the back plate frame 18 is fixed to the upper side 7 a of the back support 7 by locking with an engagement protrusion 22 described in detail later. The lower side 18 b is fixed to the lower side 7 b of the back support 7 by fastening with bolts 23.

  In the side view, the back support 7 is curved so that a height position of about one third from the bottom in the height direction of the side 7c bulges most forward. The front bulge portion 21 that bulges most forward is set at a position substantially corresponding to the front bulge portion 20 of the back plate frame 18. However, the bulging height of the front bulging portion 21 of the back support 7 is set lower than the bulging height of the front bulging portion 20 of the back plate frame 18.

  In addition, the bulge height of the front bulge portion 20 of the back plate frame 18 is between the front bulge portion 21 of the left and right sides 7 c of the back support 7 and the front bulge portion 20 of the back plate frame 18. A shape changing mechanism 24 that changes the curved shape of the side edge of the back support 6 by changing the shape of the back support 6 is interposed. Reference numeral 24 a in the figure is an operation lever of the shape changing mechanism 24.

Incidentally, on the rear surface 18a-1 of the upper side 18a of the back plate frame 18, as shown in FIG. As shown in FIG. 7, three insertion holes 25 into which the engagement protrusions 22 are inserted are formed at positions corresponding to the engagement protrusions 22 of the back plate frame 18 in the front surface 7a-1 of the upper side 7a. Has been.
As shown in FIG. 8, each of the engaging protrusions 22 protruding from the back plate frame 18 includes a rectangular plate-like insertion plate portion 22 a having a length in the protruding direction and a width in the horizontal direction with respect to the thickness in the vertical direction. And an overhanging locking portion 22b that is connected to the distal end portion of the insertion plate portion 22a and protrudes in the left-right direction. The overhanging locking portion 22b is formed in a plate shape having the same thickness as the insertion plate portion 22a. In the center position in the width direction of the overhanging locking portion 22b and the insertion plate portion 22a, a long hole-shaped lightening hole 30 is continuously formed. The lightening hole 30 constitutes a bending allowance portion for making the overhanging locking portion 22b bend easily inward in the width direction when an external force is applied to the overhanging locking portion 22b from the side. Moreover, the taper surface 22b-1 which inclines inward toward the front side is formed in the edge part of the right-and-left both sides of the protrusion latching | locking part 22b.

  As shown in FIG. 8, the front surface 7 a-1 of the upper side 7 a of the back support 7 is formed to be inclined toward the upper rear side so as to follow the inclined shape of the upper side 18 a of the back plate frame 18. . The rear surface 18a-1 of the upper side 18a of the back plate frame 18 and the front surface 7a-1 of the upper side 7a of the back support 7 are opposed surfaces that come into contact with each other when a load is applied to the back plate frame 18 from the front side. Has been. The engagement protrusion 22 and the insertion hole 25 are formed so as to extend substantially horizontally in the front-rear direction.

  On the lower surface of the upper side 7a of the back support 7, as shown in FIG. 5, three openings 31 that are recessed in a concave shape toward the upper side are provided. These openings 31 are provided corresponding to the respective insertion holes 25, and the corresponding insertion holes 25 communicate with each other in the bottoms. The bottom of the opening 31 is formed wider than the width of the insertion hole 25 in the left-right direction, and the engagement protrusion 22 protrudes when the engagement protrusion 22 is inserted into the insertion hole 25 from the front side of the back support 7. The locking part 22 b is accommodated in the bottom part of the opening part 31. The opening edge of the insertion hole 25 that opens to the front side of the bottom of the opening 31 constitutes a pull-out restricting portion 29 that engages with the overhanging locking portion 22 b protruding from the insertion hole 25 and restricts the engagement protrusion 22 from coming off. ing. Each opening 31 can visually recognize the overhanging locking portion 22b from a direction substantially orthogonal to the engaging direction of the engagement protrusion 22 and the removal restricting portion 29.

Further, a substantially rectangular recess 32 that is long in the left-right direction is formed in the upper side of the lower surface of the upper side 7a of the back support 7 so as to be recessed upward. The recess 32 is formed in such a size that four fingers other than the thumb of the person to be gripped can be inserted when the central portion of the upper side 7a of the back support 7 is gripped as a handle from the rear. . Further, a stepped portion 33 that is recessed upward with respect to the opening edge of the recessed portion 32 is formed on the front side of the recessed portion 32 in the lower surface of the upper side 7 a of the back support 7. The step portion 33 is formed over a wider width in the left-right direction than the recess portion 32.
Of the three openings 31 formed on the lower surface of the upper side 7a of the back support 7, the center opening 31 opens at the center of the bottom in the recess 32 as shown in FIG. ing.

The rear surface of the central region of the upper side 7a of the back support 7 is inclined toward the front side so as to form an acute angle with the lower surface of the upper side 7a. Therefore, the central region of the upper side 7a of the back support 7 is formed in a cross-sectional shape in which the rear surface and the lower surface form an acute angle.
On the rear surface of the upper side 7a of the back support 7 is formed a locking recess 35 (supporting portion) for locking and fixing an additional functional component 39 such as a headrest. A mounting hole and a nut (not shown) for screwing the additional functional component 39 are provided at positions corresponding to both ends in the locking recess 35. When the additional functional component is not attached, the locking recess 35 is closed by a closing cap 40 as shown in FIGS.

  When the back support 6 is attached to the back support 7, the three engagement protrusions 22 on the upper side 18 a of the back plate frame 18 of the back support 6 are inserted into the corresponding insertion holes 25 on the upper side 7 a of the back support 7. Insert into. At this time, when the distal end side of the overhanging locking portion 22b of the engaging protrusion 22 is pushed into the insertion hole 25, the overhanging locking portion 22b receives a pressing force from the inner wall of the insertion hole 25 through the tapered surface 22b-1, and The stop 22b is compressed in the direction of the lightening hole 30. Thus, when the insertion of the engagement protrusion 22 proceeds and the overhanging locking portion 22b protrudes from the insertion hole 25 toward the bottom of the opening 31, the overhanging locking portion 22b is elastically restored in the opening 31 and opened. It comes into contact with the removal restricting portion 29 in the portion 31. As a result, the upper side portion of the back support 6 is connected in a state where it is substantially in contact with the upper side 7 a of the back support 7. Thereafter, the lower side 18 b of the back plate frame 18 of the back support 6 is fastened and fixed to the lower side 7 b of the back support 7 by bolts 23.

Since the chair 1 of this embodiment is connected in a state where the upper side portion of the back support 6 is substantially in contact with the upper side 7a of the back support 7 as described above, the back support 6 is moved to move the chair 1 or the like. When trying to grip the upper side 7a of the support body 7, the fingertip cannot be inserted from below into the front surface 7a-1 side of the upper side 7a.
However, in the chair 1 of this embodiment, a substantially rectangular recess 32 that is recessed upward is formed in the center of the lower surface of the upper side 7a of the back support 7 so that the upper side 7a of the back support 7 is formed. In the case of gripping with a handshake, the other four fingers are turned around the lower side of the upper side 7a of the back support 7 with the thumb placed on the front surface of the upper end of the back support 6 and the four The fingertips of these fingers, or the fingertips of any of them, can be inserted into the recess 32, and the upper side 7a of the back support 7 can be stably held in this state. Therefore, the chair 1 of this embodiment has a structure in which the back support 6 and the back support 7 are joined together at the upper side so that the office posture can be easily taken while sitting, but the back support 6 is moved when the chair 1 is moved. The upper side 7a of the support 7 can be easily and stably gripped as a handle.

  In the chair 1 of this embodiment, since the cross-sectional shape of the central region of the upper side 7a of the back support 7 is a shape in which the rear surface and the lower surface form an acute angle, the upper side 7a of the back support 7 is When gripping the center region as a handshake, bend the joints of the four fingers other than the thumb that wraps around the lower surface side of the upper side 7a at a sharp angle between the rear surface and the lower surface to a natural angle where force can be easily applied. be able to. Therefore, in the case of this chair 1, the upper side 7a of the back support 7 can be gripped more easily.

  Furthermore, in the chair 1 of this embodiment, since the lower surface of the upper side 7a of the back support 7 is provided with a stepped portion 33 that is recessed upward on the front side of the opening edge of the recessed portion 32, Even if a fingertip to insert a finger into the recess 32 to grip the upper side 7a of the receiving support 7 is inserted into the front side of the recess 32, the finger is placed on the rear side wall of the step 33. The upper side 7a can be easily gripped by hanging.

  Moreover, in the case of the chair 1 of this embodiment, since the latching recessed part 35 for attaching the additional functional components 39, such as a headrest, to the upper side 7a of the back support 7 is provided in the rear surface of the upper side 7a, in FIG. As shown by the phantom lines, even when the additional functional component 39 is attached to the upper side 7a of the back support 7, the recess 32 on the lower surface side of the upper side 7a is blocked by the additional functional component or the fingertip is inserted. The space for this is not narrowed. Therefore, in the chair 1 of this embodiment, even when the additional functional component 39 is attached, the upper side 7a of the back support 7 can be easily and stably gripped.

  In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary. For example, in the above-described embodiment, the back support 6 is configured by stretching the back material 19 on the back plate frame 18, but the back support is a cushioning material formed on a plate-like member having no large opening inside. A structure in which a tension member is attached or a structure of a single plate member having flexibility may be used.

1 Chair 6 Back support 7 Back support 7a Upper side (horizontal beam part)
25 Insertion hole (engagement recess)
32 Indentation part 33 Step part 35 Locking recessed part (support part)
39 Additional functional parts

Claims (4)

A back support that receives the load on the back of the seated person,
A back support that is disposed on the back side of the back support and supports the back support,
In a chair provided with a backrest portion in which an upper end portion of the back support and an upper end portion of the back support are coupled to each other
The upper end of the back support is provided with a cross beam extending in the left-right direction,
An engagement recess that can be engaged with an engagement protrusion provided on the back support is formed on the front surface of the transverse beam portion, and on the lower surface of the transverse beam portion, the transverse beam portion is below the engagement recess. A chair characterized by being provided with a recessed portion that is recessed upward so as to allow insertion of a fingertip when the hand is gripped.   The chair according to claim 1, wherein the cross beam portion is formed in a cross-sectional shape in which a rear surface and the lower surface form an acute angle.   3. The chair according to claim 1, wherein a stepped portion that is recessed upward is provided on the lower surface of the horizontal beam portion on the front side of the opening edge of the recessed portion.   The chair according to any one of claims 1 to 3, wherein a support portion for an additional functional component attached to the horizontal beam portion is provided on a rear surface of the horizontal beam portion.

Images