JP7370803B2 - Chair armrest mounting structure, chair - Google Patents

Description

The present invention relates to a chair armrest mounting structure and a chair.

As belonging to the above technical field, for example, a chair armrest mounting structure disclosed in Patent Document 1 below is known.
In the chair armrest mounting structure disclosed in Patent Document 1, the backrest is supported by a backrest support rod that stands up from the rear part of the legs, and the lower end of the vertically facing mounting base of the armrest is attached to the backrest. by fitting into the upward protrusion of the armrest support member provided at the rear end of the leg body on the side, and fastening the upper end of the mounting base to the side surface of the backrest with a bolt, The armrest is attached to the legs and the backrest such that the inner surface of the armrest comes into contact with the side surface of the backrest.

JP2012-095931A

In the configuration of Patent Document 1 mentioned above, the lower end of the mounting base of the armrest is fitted into the upward protrusion of the armrest support member provided on the leg, and the upper end of the mounting base of the armrest is connected to the backrest. It is fastened with bolts on the side. Therefore, when attaching the armrest, it was necessary to align the three members: the armrest, the backrest, and the legs. In addition, because the legs are provided with upward protrusions that support the armrests from below, there are significant design constraints.

The present invention has been made in view of the above-mentioned problems, and aims to provide a chair armrest mounting structure and a chair that allow easy positioning when attaching an armrest and have fewer restrictions on design.

A chair armrest mounting structure according to one aspect of the present invention is a chair armrest mounting structure comprising a backrest and an armrest disposed on a side of the backrest, the backrest being attached to the backrest. The armrest has a first opening and a second opening that are opened to the sides of the armrest and are spaced apart from each other in the vertical direction, and the armrest is inserted into the first opening, and the armrest is inserted into the first opening. an insertion portion that engages with the backrest from the side opposite to the opening side of the opening; and a side that is supported by the opening edge of the second opening and that reduces the amount of engagement of the insertion portion with respect to the backrest; and a supported portion that restricts displacement of the armrest.

According to this configuration, since the insertion portion of the armrest inserted into the first opening of the backrest is engaged with the backrest from the side opposite to the opening side of the first opening, the side of the armrest with respect to the backrest is It is possible to prevent it from falling off (falling over). In addition, the supported portion of the armrest supported by the opening edge of the second opening of the backrest restricts the displacement of the armrest to the side where the insertion portion of the insertion portion relative to the backrest becomes smaller. Mutual support is completed only by the relationship with the armrest. Therefore, when installing the armrest, only two parts, the armrest and the backrest, are required for positioning, and there is no need to separately prepare parts to support the armrest in addition to the backrest, so there are no design restrictions. becomes smaller.

Moreover, in the armrest mounting structure of the chair, a bolt may be provided to be inserted through the second opening and fasten the supported part to the backrest.

According to this configuration, since the supported part is fastened to the backrest by the bolt inserted through the second opening, the displacement of the supported part with respect to the second opening is reliably regulated. The inserted state of the insertion part with respect to the first opening is also reliably maintained. Therefore, the mutual support between the backrest and the armrest can be made more robust.

Further, in the chair armrest mounting structure, the backrest has a cylindrical part communicating with the first opening and the second opening, and has an insertion part inserted into the cylindrical part. Good too.

According to this configuration, since the cylindrical part communicates with the first opening and the second opening, it is easy to ensure the engagement depth of the insertion part in the first opening, and the second opening In this case, it becomes easier to ensure the insertion depth of the supported part. Such a cylindrical portion can be easily molded by sliding a molding die. Moreover, since the insertion part is inserted into the cylindrical part and the insertion part fills at least a part of the internal space of the cylindrical part, the strength can be maintained.

Moreover, in the above-mentioned armrest mounting structure for a chair, a screw hole into which the bolt is screwed may be formed in the insertion portion.

According to this configuration, the insertion part inserted into the cylindrical part of the backrest has a screw hole, and the supported part is fastened to the backrest by screwing the bolt into the insertion part. This eliminates the need to form screw holes in the backrest. Further, since the insertion portion supports the cylindrical portion of the backrest from the inside, deformation of the backrest due to fastening of the bolt can be suppressed.

Moreover, in the armrest mounting structure for a chair, the insertion part may have a relief groove that allows the insertion part to be inserted into the cylindrical part when the insertion part is inserted into the cylindrical part.

According to this configuration, the insertion part can support the cylindrical part of the backrest from the inside, and can be inserted into the cylindrical part through the first opening of the insertion part. In addition, even if the materials of the insertion part and the insertion part are different, the presence of the relief groove prevents contact between the different materials and suppresses scraping that occurs on at least one of the insertion part and the insertion part. I can do it.

A chair according to one aspect of the present invention includes the above-described chair armrest mounting structure.

A chair according to one aspect of the present invention is a chair including the above-described chair armrest mounting structure, and includes a support structure that supports at least the backrest, and the support structure is provided with the insertion portion. It is being

According to this configuration, since the insertion part is provided in the support structure, it becomes easy to insert the cylindrical part of the backrest into the insertion part with the support structure upright, and the chair can be assembled efficiently. You will be able to do this.

According to one aspect of the present invention, it is possible to obtain a chair armrest mounting structure and a chair in which positioning is easy when attaching an armrest, and design restrictions are small.

FIG. 1 is a perspective view of a chair in an embodiment of the present invention. FIG. 3 is a side view of the upper part of the chair in an embodiment of the present invention. FIG. 3 is a view of the upper part of the chair with the left armrest removed in an embodiment of the invention. It is a side view of the left armrest in one embodiment of the present invention seen from the right side. It is a side view of the insertion rod of the support structure in one embodiment of this invention. FIG. 3 is a sectional view taken along the line AA shown in FIG. 2; It is a sectional view of the armrest attachment structure of the chair in a modification of one embodiment of the present invention.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a chair 1 in one embodiment of the present invention.
As shown in FIG. 1, the chair 1 includes a support structure 2, a seat body 3, a backrest 4, and armrests 5. The seat body 3, the backrest 4, and the armrests 5 are supported by the support structure 2.

In the following explanation, unless otherwise specified, the front, back, top, bottom, left, right, etc. directions of a seated person who is seated in a normal posture on the seat body 3 of the chair 1 installed on a horizontal floor surface are referred to as "front"; The opposite side is defined as the "rear", and the top, bottom, left and right directions are the same as seen from the seated person. In the figure, arrow UP indicates upward, arrow FR indicates forward, and arrow LH indicates left.

The backrest 4 is arranged behind the seat body 3. The armrests 5 are arranged on the left and right sides of the backrest 4. The support structure 2 that supports these has a pair of left and right front legs 21 and a pair of left and right rear legs 22. The front leg portion 21 extends forward from a substantially intermediate position in the vertical direction of the rear leg portion 22. Casters 23 are attached to the lower ends of the front leg section 21 and the rear leg section 22.

The pair of left and right front legs 21 are connected to each other by a connecting rod 24. The connecting rod 24 supports the lower surface of the seat body 3. A seat mounting portion 25 is provided above the connection position of the rear leg portion 22 with the front leg portion 21 . The seat mounting portion 25 pivotally supports both left and right rear side surfaces of the seat 3.

At the upper end of the rear leg portion 22, an insertion rod 26 (insertion portion) is provided to protrude upward. The insertion rod 26 is inserted into a cylindrical portion 41 that opens downward at both left and right ends of the backrest 4. The armrest 5 engages with an engagement groove 42 opening on the side of the backrest 4, and is screwed together with the backrest 4 to the insertion rod 26 from the side.

FIG. 2 is a side view of the upper part of the chair 1 in one embodiment of the present invention. FIG. 3 is a side view of the upper part of the chair 1 with the left armrest 5 removed in one embodiment of the present invention.
As shown in FIGS. 2 and 3, a side surface 40 of the backrest 4 is formed with an engagement groove 42 in which the armrest 5 engages. The engagement groove 42 is, for example, molded with resin together with the main body of the backrest 4.

As shown in FIG. 3, the engagement groove 42 opens on the side of the backrest 4 and extends in the vertical direction along the backrest 4. Since the backrest 4 of this embodiment extends in the vertical direction and is tilted diagonally backward, the engagement groove 42 also extends in the vertical direction and diagonally rearward. The bottom wall 42a of the engagement groove 42 is provided at a constant depth in the direction perpendicular to the side surface 40 of the backrest 4.

The bottom wall 42a of the engagement groove 42 has a substantially obtuse triangular shape when viewed from the side. This obtuse triangular shape has an acute angle at the front end, and an acute angle at the upper end which is smaller than the acute angle at the front end. The peripheral wall 42b of the engagement groove 42 annularly surrounds the bottom wall 42a. The peripheral wall 42b has a front wall surface 42b1 that forms the front side of the peripheral wall 42b, and a rear wall surface 42b2 that forms the rear side of the peripheral wall 42b, and the front wall surface 42b1 and the rear wall surface 42b2 each extend in the vertical direction and face upward. gradually approaching each other.

As shown in FIG. 2, the armrest 5 has an armrest portion 51 that extends further forward than the backrest 4. As shown in FIG. The upper surface of the elbow rest part 51 is an elbow rest surface 51a. The distal end portion 51A of the elbow rest portion 51 faces slightly in the elevation direction. Therefore, the elbow rest surface 51a is slightly inclined upward from the base end 51B of the elbow rest 51 toward the distal end 51A. An insertion hole 52 for a bolt 60 is formed in the base end 51B of the elbow rest 51.

The armrest 5 extends upward from the base end 51B of the elbow rest part 51 and engages with the engagement groove 42, and the armrest 5 extends downward from the base end 51B of the elbow rest part 51 and engages with the first support rod part 53. a second support rod portion 54 that engages with the groove 42; The first support rod portion 53 and the second support rod portion 54 generate a moment about the proximal end portion 51B (bolt 60) of the elbow rest portion 51 when a load is applied to the elbow rest surface 51a of the elbow rest portion 51. This is the part that receives the load.

The first support rod portion 53 extends upward along the engagement groove 42 . That is, the width of the first support rod portion 53 in the front-rear direction gradually increases toward the base end portion 51B of the elbow rest portion 51. The first support rod portion 53 is housed within the engagement groove 42 without protruding laterally from the engagement groove 42 . The upper end surface 53a of the first support rod portion 53 is an inclined surface that approaches the bottom wall 42a of the engagement groove 42 as it goes upward. Thereby, it is possible to prevent fingers or the like from getting caught on the upper end of the first support rod portion 53.

The first support rod portion 53 is longer than the second support rod portion 54. The length L1 of the first support rod 53 (the straight line distance from the center of the bolt 60 to the upper end of the first support rod 53) is the length L2 of the second support rod 54 (the straight line distance from the center of the bolt 60 to the second support rod 53). The length is about 5 to 10 times the straight line distance to the lower end of the rod portion 54.

FIG. 4 is a side view of the left armrest 5 seen from the right side in one embodiment of the present invention. FIG. 5 is a side view of the insertion rod 26 of the support structure 2 in one embodiment of the invention. FIG. 6 is a sectional view taken along the line AA shown in FIG.
As shown in FIG. 4, the armrest 5 has a boss portion 55 (supported portion) in which an insertion hole 52 is formed on a surface facing the backrest 4 (engaging groove 42). The boss portion 55 is a protrusion that is rectangular in side view.

On the other hand, in the backrest 4, as shown in FIG. 3, a first opening 42c1 and a second opening 42c2 are formed in the bottom wall 42a of the engagement groove 42. The first opening 42c1 and the second opening 42c2 open to the sides of the backrest 4. The second opening 42c2 is a rectangular opening in a side view similar to the boss 55, into which the boss 55 is inserted, and exposes the screw hole 26a into which the bolt 60 is screwed. The screw hole 26a is formed in the insertion rod 26 of the support structure 2, as shown in FIG. The insertion rod 26 is also formed with a groove 26b that is rectangular in side view and into which the boss 55 is inserted.

As shown in FIG. 3, the first opening 42c1 is formed apart from the second opening 42c2 in the vertical direction. The first opening 42c1 is arranged above the second opening 42c2 and has a rectangular shape in side view that extends diagonally rearward along the backrest 4, but its upper opening edge extends in the horizontal direction. As shown in FIG. 4, the insertion portion 56 provided at the tip of the first support rod portion 53 extending above the armrest 5 is inserted into the first opening portion 42c1.

As shown in FIG. 6, the insertion part 56 is inserted into the first opening 42c1, and is located on the opposite side (from the outside to the inside of the backrest 4 in the left-right direction) of the first opening 42c1. It is locked to the backrest 4 from the side (from the inside to the outside of the backrest 4 in the left-right direction). The insertion part 56 has a substantially L-shaped hook shape in a cross-sectional view shown in FIG. 6, and includes a horizontal part 56a inserted into the first opening 42c1, and a first It has a bent portion 56b that faces the inner wall surface of the cylindrical portion 41 in the left-right direction in a region above the upper end of the opening edge of the opening portion 42c1.

On the other hand, the insertion rod 26 has an escape groove that allows the insertion portion 56 to be inserted into the cylindrical portion 41 through the second opening 42c2 when the insertion rod 26 is inserted into the cylindrical portion 41. 26c is formed. The relief groove 26c forms a gap with the insertion part 56, thereby avoiding contact between the insertion rod 26 (for example, a metal frame) and the insertion part 56 (for example, a resin frame). As shown in FIG. 5, the escape groove 26c opens laterally at the upper end of the insertion rod 26 and also opens forward.

According to the above configuration, as shown in FIG. 2, when a downward load is applied to the elbow rest surface 51a of the elbow rest part 51, for example, the load is applied to the elbow rest surface 51a of the elbow rest part 51. A moment load occurs. At this time, the first support rod portion 53 comes into contact with the front wall surface 42b1 of the peripheral wall 42b of the engagement groove 42 and receives a moment load. Further, the second support rod portion 54 comes into contact with the rear wall surface 42b2 of the peripheral wall 42b of the engagement groove 42 and receives a moment load.

Here, since the escape groove 26c is open forward, even when the first support rod portion 53 receives a moment load and tries to rotate forward, the insertion portion 56 is opened forward. There is no interference with Therefore, even if the insertion rod 26 and the insertion part 56 are made of different materials, the existence of the relief groove 26c prevents contact between the different materials, and at least one of the insertion rod 26 and the insertion part 56 ( For example, it is possible to suppress scratches occurring in the insertion portion 56 (resin frame).

As shown in FIG. 6, the boss portion 55 is inserted into the second opening portion 42c2 and is supported by the edge of the opening, and the side where the insertion portion 56 has a smaller amount of engagement with the backrest 4 (this embodiment Then, the displacement of the armrest 5 in the downward direction is restricted. The boss portion 55 is fastened to the backrest 4 with a bolt 60 inserted through the second opening 42c2. Specifically, the backrest 4 and the armrest 5 are jointly fastened to the insertion rod 26 of the support structure 2 by bolts 60.

That is, the insertion rod 26 is inserted into the above-mentioned cylindrical portion 41 of the backrest 4. The second opening 42c2 formed in the backrest 4 allows the inside and outside of the cylindrical portion 41 to communicate with each other. When the boss portion 55 of the armrest 5 is inserted into the second opening 42c2, the insertion hole 52 and the screw hole 26a are aligned. Then, by screwing the bolt 60 into the screw hole 26a through the insertion hole 52, the backrest 4 and the armrest 5 can be fastened together to the insertion rod 26.

Note that, as shown in FIG. 6, the lower end surface 54a of the second support rod portion 54 is in contact with the support structure 2. The support structure 2 has a contact surface 27 (step surface) on the upper end surface of the rear leg portion 22 described above. The contact surface 27 extends substantially horizontally and is in surface contact with the lower end surface 54a of the second support rod portion 54.

A portion of the second support rod portion 54 protrudes from the engagement groove 42 , and a lower end surface 54 a of the protruded portion is in contact with the contact surface 27 of the support structure 2 . Note that the accommodating portion 54b accommodated in the engagement groove 42 of the second support rod portion 54 is supported by the peripheral wall 42b of the engagement groove 42.

According to the armrest mounting structure of the chair 1 configured as described above, as shown in FIG. Since the armrest 5 is engaged with the backrest 4 from the opposite side, it is possible to prevent the armrest 5 from coming off (falling down) to the side relative to the backrest 4. Further, the boss portion 55 of the armrest 5 supported by the opening edge of the second opening 42c2 of the backrest 4 is displaced toward the side (downward) where the amount of engagement of the insertion portion 56 with respect to the backrest 4 is reduced. Therefore, mutual support is completed only by the relationship between the backrest 4 and the armrests 5, even without the support structure 2. Therefore, positioning when attaching the armrest 5 only requires two members, the armrest 5 and the backrest 4, and there is no need to separately prepare parts to support the armrest 5 in addition to the backrest 4. Design constraints are reduced.

As described above, according to the present embodiment described above, the armrest mounting structure for the chair 1 includes the backrest 4 and the armrests 5 arranged on the sides of the backrest 4, and the backrest 4 includes: It has a first opening 42c1 and a second opening 42c2 that are open to the sides of the backrest 4 and are spaced apart from each other in the vertical direction, and the armrest 5 is inserted into the first opening 42c1. , an insertion part 56 that engages with the backrest 4 from the side opposite to the opening side of the first opening 42c1, and an insertion part 56 that is supported by the opening edge of the second opening 42c2 and that engages the backrest 4 with the insertion part 56. By adopting a configuration in which the armrest 5 has a boss portion 55 that restricts displacement of the armrest 5 toward the side where the width decreases, positioning when attaching the armrest 5 is easy, and there are no design restrictions. A small chair 1 and its armrest mounting structure are obtained.

Further, the armrest mounting structure of the chair 1 according to the present embodiment includes a bolt 60 that is inserted through the second opening 42c2 and fastens the boss portion 55 to the backrest 4. According to this configuration, since the boss portion 55 is fastened to the backrest 4 by the bolt 60 inserted into the second opening 42c2, displacement of the boss portion 55 with respect to the second opening 42c2 is reliably regulated, and Thereby, the insertion state of the insertion portion 56 into the first opening 42c1 is also reliably maintained. Therefore, the mutual support between the backrest 4 and the armrest 5 can be made more robust.

In addition, in the armrest mounting structure of the chair 1 according to the present embodiment, the backrest 4 has a cylindrical portion 41 that communicates with the first opening 42c1 and the second opening 42c2, and the backrest 4 has a cylindrical portion 41 that is inserted into the cylindrical portion 41. It has a rod 26. According to this configuration, since the cylindrical portion 41 communicates with the first opening 42c1 and the second opening 42c2, it is easy to ensure the engagement depth of the insertion portion 56 in the first opening 42c1. , it becomes easier to ensure the insertion depth of the boss portion 55 in the second opening 42c2. Such a cylindrical portion 41 can be easily molded by sliding a mold. Further, the insertion rod 26 is inserted into the cylindrical portion 41, and the insertion rod 26 fills at least a portion of the internal space of the cylindrical portion 41, so that the strength can be maintained.

Further, the insertion rod 26 of this embodiment is formed with a screw hole 26a into which the bolt 60 is screwed. According to this configuration, the insertion rod 26 inserted into the cylindrical portion 41 of the backrest 4 has a screw hole 26a, and by screwing the bolt 60 into the insertion rod 26, the boss portion 55 is inserted into the backrest. 4 is concluded. This eliminates the need to form the screw hole 26a in the backrest 4. Further, since the insertion rod 26 supports the cylindrical portion 41 of the backrest 4 from inside, deformation of the backrest 4 due to fastening of the bolt 60 can be suppressed.

Furthermore, the insertion rod 26 of this embodiment has a relief groove 26c that allows the insertion portion 56 to be inserted into the cylindrical portion 41 when the insertion rod 26 is inserted into the cylindrical portion 41. According to this configuration, while the insertion rod 26 supports the cylindrical portion 41 of the backrest 4 from the inside, it is possible to insert the insertion portion 56 into the cylindrical portion 41 through the first opening 42c1. I can do it. In addition, even if the insertion rod 26 and the insertion part 56 are made of different materials, the presence of the relief groove 26c prevents contact between these different materials, so that contact between the insertion rod 26 and the insertion part 56 can be avoided. It is possible to suppress scratches and the like.

Further, the chair 1 of this embodiment includes the support structure 2 that supports at least the backrest 4, and the support structure 2 is provided with the insertion rod 26, so that when the support structure 2 is upright, The cylindrical part 41 of the backrest 4 can be easily inserted into the insertion rod 26, and the chair 1 can be assembled efficiently.

Although preferred embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the above embodiments. The various shapes and combinations of the constituent members shown in the above-described embodiments are merely examples, and can be variously changed based on design requirements and the like without departing from the gist of the present invention.

For example, in the above embodiment, the insertion rod 26 of the support structure 2 is exemplified as the insertion portion that is inserted into the cylindrical portion 41 and has the screw hole 26a into which the bolt 60 is screwed. It does not matter if it is not provided in the structure 2. Specifically, as in the modification shown in FIG. 7, a nut 70 (preferably an insert nut, for example) is inserted into the cylindrical portion 41, and a bolt 60 is screwed into the threaded hole 26a of the nut 70. Good too.
Alternatively, the insertion rod 26 may be formed separately from the support structure 2.
Alternatively, the insertion rod 26 may have a configuration in which the screw hole 26a is not formed.

Further, for example, in the above embodiment, the first opening 42c1 is arranged above the second opening 42c2, but the first opening 42c1 is arranged below the second opening 42c2. I don't mind. In this case, the boss portion 55 supported by the opening edge of the second opening portion 42c2 restricts the displacement of the armrest 5 to the side (in this case, upward) where the insertion portion 56 has less contact with the backrest 4. It may be a configuration.

DESCRIPTION OF SYMBOLS 1...Chair, 2...Support structure, 4...Backrest, 5...Armrest, 26...Insert rod (insertion part), 26a...Screw hole, 26c...Escape groove, 41...Cylindrical part, 42c1...First opening part, 42c2...second opening part, 55...boss part (supported part), 56...insertion part, 60...bolt, 70...nut (insertion part)

Claims (7)

A chair armrest mounting structure comprising a backrest and an armrest disposed on the side of the backrest,
The backrest has a first opening and a second opening that are open to the sides of the backrest and are spaced apart from each other in the vertical direction,
The armrest is
an insertion portion that is inserted into the first opening and is engaged with the backrest from a side opposite to the opening side of the first opening;
a supported part that is supported by an opening edge of the second opening and that restricts displacement of the armrest in a direction where the insertion part has less contact with the backrest ;
A chair armrest mounting structure , comprising a bolt that is inserted through the second opening and fastens the supported part to the backrest . The backrest has a cylindrical part that communicates with the first opening and the second opening,
The chair armrest mounting structure according to claim 1 , comprising an insertion part inserted into the cylindrical part. 3. The chair armrest mounting structure according to claim 2 , wherein the insertion portion has a screw hole into which the bolt is screwed. The chair armrest mounting structure according to claim 2 or 3 , wherein the insertion portion has a clearance groove that allows the insertion portion to be inserted into the cylindrical portion when the insertion portion is inserted into the cylindrical portion. A chair armrest mounting structure comprising a backrest and an armrest disposed on the side of the backrest,
The backrest has a first opening and a second opening that are open to the sides of the backrest and are spaced apart from each other in the vertical direction,
The armrest is
an insertion portion that is inserted into the first opening and is engaged with the backrest from a side opposite to the opening side of the first opening;
a supported part that is supported by an opening edge of the second opening and that restricts displacement of the armrest in a direction where the insertion part has less contact with the backrest;
The backrest has a cylindrical part that communicates with the first opening and the second opening,
having an insertion part inserted into the cylindrical part,
A chair armrest mounting structure, wherein the insertion part has an escape groove that allows the insertion part to be inserted into the cylindrical part when the insertion part is inserted into the cylindrical part. A chair comprising the chair armrest mounting structure according to any one of claims 1 to 5. A chair comprising the chair armrest mounting structure according to any one of claims 3 to 5, comprising a support structure that supports at least the backrest,
A chair, wherein the support structure is provided with the insert.

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