JP4943113B2 - Chair with armrests - Google Patents

Description

  The present invention relates to a chair characterized by a novel mounting structure for an armrest device.

  For example, an armrest device is attached to a swivel chair often used for office work. In general, the armrest device is often an optional item attached according to a user's request. An armrest device generally comprises an elbow rest on which a person places an elbow (arm) and an elbow support that supports the elbow rest from below, and the base (lower end) of the elbow support serves as another member of the chair. It is attached.

  The armrest device is fastened to other members of the chair with bolts (screws), and when the armrest device is fastened to which member of the chair, it is attached to the seat or the lower surface of the seat cover that covers it from below (For example, Patent Document 1), when attached to a base that supports a seat, when attached to a back frame material for supporting the backrest so as to be able to tilt backward (for example, Patent Document 2), and the like. It is done.

  In Patent Document 1, the bolt that fastens the elbow support is in a substantially horizontal posture, and a step portion that hides the head of the bolt is formed at the base portion of the elbow support, and this step portion is covered with a cover. ing. Moreover, in patent document 1, the junction part of an elbow support and an elbow attachment part is mutually uneven | corrugated shape. In addition, when attaching an elbow support to a seat or its cover, the bolt is also screwed into a seat or a cover from the downward direction.

In Patent Document 2, a laterally extending branch portion is provided in a portion of the back frame material located at the lower portion of the seat, and the base portion of the elbow support is fastened to the branch portion with a bolt in a substantially horizontal posture. Therefore, similarly to Patent Document 1, also in Patent Document 2, a step portion into which the head of the bolt fits is formed at the base portion of the elbow support. Moreover, in patent document 2, in order to position an elbow support and to prevent displacement, the joint surface between the elbow support of the armrest device and the branch portion of the back frame member has an angled projection and a recess, and a pin and a pin hole. Is formed.
JP 2001-197957 A JP 2004-49737 A

  When a person uses a chair with an armrest device, for example, the user may get up with both hands on the armrest, and a large load (a load close to the total weight of the user) may be applied to the armrest device. Therefore, the armrest device must be firmly attached. However, in both patent documents, although the elbow support is positioned, its function is weak and it is difficult to obtain high fastening strength.

Moreover, in both patent documents, since the bolt is in a posture that extends long in the same direction as the pressing direction of the elbow support with respect to the mounting portion, the elbow support will quickly wobble when the bolt is loosened, which is also high in this aspect There is a possibility that it is difficult to obtain the fastening strength. In other words, in both patent documents, the load acting on the armrest device (downward load) acts directly on the bolt as an external force that folds the armrest device, and most of the load acting on the armrest device is supported by the bolt. Therefore, there is a concern about the fastening strength, and there is a concern that the bolt easily loosens due to the load that accompanies the use of the armrest device acting directly on the bolt.

On the other hand, the appearance in the chair is an important factor, in order that the bolt and the bolt holes in the state and detached state fitted with armrest device as much as possible the exposure Shinano Ino is preferred. However, in both patent documents, the head of the bolt can be seen by humans under normal conditions, so the cover must be used, and the bolt holes of the seat and back frame material are not visible from the outside without the armrest device attached. There is a problem that the appearance is not good because it looks.

  It is an object of the present invention to improve such a current situation.

The chair of the present invention includes, as large elements, an elbow device in which an elbow rest is provided on the upper end of the elbow support, and an elbow receiving portion to which the lower end of the elbow support is fixed. In the first aspect of the present invention, the elbow support part has a recess into which a boss formed at the lower end part of the elbow support is fitted, and the recess of the elbow support part and the boss part of the elbow support are respectively tapered. by forming the Jo, the boss and the recess are adapted to tightly fit, further to an appropriate site of the wall forming the inner periphery of said recess of said elbow receiving portion, the boss bolt holes capable inserting of the insertion direction and crossing the bolts from the direction of section is provided, in the configuration that are fixed to the boss portion of the elbow support receiving portion elbow by a bolt inserted through said bolt hole, wherein The bolt is fitted with a bowl-shaped washer having a cylindrical part into which the head of the bolt is fitted, and the cylindrical part of the washer is formed in a tapered shape with an outer diameter decreasing toward the tip of the bolt. While the elbow support A tapered countersink hole into which the washer is fitted is formed, and when the bolt is screwed, the outer peripheral surface of the washer hits the inner peripheral surface of the countersink hole and the washer and the bolt move to the back side of the recess By doing so, the elbow support can be moved to the back side of the recess.

  The invention of claim 2 further comprises a base supported by leg struts in claim 1, and a back frame material for attaching a backrest is connected to the base so as to be able to tilt backward. A part of the back frame material is the elbow support part by opening the frame material to the left and right outwards and forming a recess with upper, lower, left and right inner peripheral surfaces, and the elbow support boss part is It is inserted into the recess from the direction.

On the other hand, the bottom wall defining the bottom surface of the recess of the back frame member is that vacant and a vertical opening bolt holes of communicating with the opened and the lower spread tapered the spot facing hole which downward.

  In the present invention, “elbow support” is a term that collectively refers to members that support the elbow pads, and includes a case in which the elbow pads are integrated with the elbow pads. Of course, the case where the elbow support is separate from the elbow rest is also included. In this case, the elbow support includes a case where the elbow support is a single member and a case where the elbow support is composed of a plurality of members.

  In the present invention, since the boss portion of the elbow support is fitted in the recess of the elbow support portion, the load acting on the armrest device acts to bring the boss portion into contact with the inner surface of the recess. In addition, since the bolt extends in a direction crossing the insertion direction of the boss, the load acting on the armrest device does not directly act on the bolt, and the bolt only serves as a kind of retaining. Even if there is only one bolt, for example, a sufficient strength can be ensured, and vibration associated with the use of the armrest device does not directly act on the bolt, so that loosening is also suppressed. Together, these points ensure high fastening strength in the present invention.

  In addition, since the boss portion of the elbow support is temporarily positioned by fitting into the recess, the work of bending the armrest device can be performed easily. Furthermore, the boss part of the elbow support enters the recess of the elbow support part by tightening (screwing) the bolt, and the boss part is held in a tightly fitted state. Can be secured.

Moreover, in this invention, a boss | hub part can be reliably moved to the back part of a recess by the combination of a simple structure of a taper countersink hole and a taper type washer. For this reason, it is excellent in the certainty of movement of a boss | hub part and cost. In the structure of Claim 2, since the counterbore hole and the bolt hole are opened downward, it is not visible to a person in a normal state. Therefore, the appearance is poor even when the armrest device is attached or not attached. Never become.

  Next, an embodiment of the present invention will be described with reference to the drawings. This embodiment is applied to a swivel chair often used for office work. First, an outline of the chair will be described with reference to FIG.

(1) Outline In FIG. 1, (A) is a perspective view, and (B) is a right side view. The chair includes a leg 1, a seat 2, and a backrest 3. The leg 1 includes a limb 4 extending radially and a leg support 5 made of a gas cylinder. An upper opening box-like base 6 is fixed to the upper end of the leg support 5. The backrest 3 is entirely made of a resin plate blended with an elastomer, and has enough flexibility that a general adult can hold it with both hands and bend it easily. Needless to say, the backrest 3 may have a structure in which a cushion is stretched on the front surface of the resin inner shell.

  A pair of left and right back frame members 7 that are substantially rearwardly inclined in a side view are connected to the rear end portion of the base 6 and the left and right side portions by a left and right longitudinal shaft (not shown). A vertically long back strut 8 is fixed to the rear end of the back frame member 7, and the upper end of the backrest 3 is fixed to the upper end of the back strut 8. The back frame material 7 is made of metal such as aluminum (die-cast product), and the back support 8 is made of synthetic resin. Note that the back frame member 7 and the back column 8 can be integrally formed.

  The seat 2 is connected to a pair of left and right front links 9 connected to the front portion of the base 6 and a pair of left and right rear links 10 rotatably attached to the back frame member 7. When a person sits down, The seat 2 moves backward while being lowered by the rotation of the links 9 and 10. On the other hand, the lower part of the backrest 3 is connected by the upper link 11 and the lower link 12, and since there is no relation to the present application, the details are omitted. However, when a person is seated and the seat 2 is lowered, the lower part of the backrest 3 moves forward. Even if it sits shallowly, the lower part of the backrest 3 (lumbar support part) supports the person's waist.

  A pair of left and right armrest devices 13 are attached to the front part of the left and right back frame member 7. The armrest device 13 is roughly divided into an elbow pad 14 and an elbow support 15 that supports the armrest 14 from below. The elbow support 15 is further provided with a bracket portion 16 fixed to the back frame member 7, and the bracket portion 16. And a fixed elbow support 17. The bracket portion 16 constitutes the base portion (lower end portion) of the elbow support 15. An operation cylinder 18 fitted to the elbow support 17 is attached to the elbow rest 14, and the height can be adjusted by pulling a lever 19 provided on the operation cylinder 18.

  The bracket portion 16 and the elbow strut 17 can be integrated. It is also possible to integrally mold the entire armrest device 13 with resin. Next, the detail of the structure which fixes the armrest apparatus 13 to the back frame material 7 is demonstrated based on drawing after FIG.

(2) Armrest mounting structure (1)
2 is a perspective view of the back frame member 7, FIG. 3 is an exploded perspective view of the main part, FIG. 4A is a separated plan view of the main part, and FIG. FIG. 5 is a partial side view of the back frame member 7, FIG. 6 is a partial bottom view of the back frame member 7, and FIG. 7 is a state in which the back frame member 7 is broken. 8 is a sectional view taken along the line VIII-VIII of FIG. 4 during the attachment of the bracket portion 16, and FIG. 9 is a sectional view taken along the line IX-IX of FIG.

As shown in FIG. 2, a cylindrical elbow receiving portion 21 that is long in the longitudinal direction is formed integrally with the front portion of the back frame member 7 with an outward opening projecting outward in the left and right directions. As shown in FIG. 7, the front portion of the back frame material 7 is formed with a bearing portion 22 into which a shaft for attaching the back frame material 7 to the base 6 is fitted. and it enters halfway, Therefore, the inside of the elbow receiving portion 21 that only the front part is in uneven shape in plan view (which shows the stepped portion by the reference numeral 23.).

  The inner peripheral surface of the elbow receiving portion 21 has a tapered shape in which the interval narrows toward the back as a whole (the interval increases toward the outside). That is, as shown in FIG.7 and FIG.8, the recess 24 of the elbow receiving part 21 is inclined on both the front and rear surfaces 24a and 24b and the upper and lower surfaces 24c and 24d (any of the front and rear surfaces 24a and 24b). One of them may be an inclined surface, and one of the upper and lower surfaces 24c, 24d may be an inclined surface.)

As shown in FIG. 7 and FIG. 8, an opening step portion 25 that is stepped down to some extent is formed in the opening portion of the elbow receiving portion 21 over the entire circumference. The elbow receiving portion 21 has a bottom plate 26 that defines the bottom surface of the recess 24, but the bottom plate 26 is not necessarily required (that is, the recess 24 may be opened in the right and left inside and outside of the back frame member 7). .). In addition, what is shown by the code | symbol 27 in FIG. 2 is the bearing cylinder part in which the axis | shaft for interlocking the backrest 3 and the seat 2 at the time of locking is fitted.

Bracket portion 16 of the elbow support 15 is a die-cast products such as aluminum as well as the back frame member 7, most of which is located below the seat 102, left and right outer seat on the outer end portion The small-diameter portion 28a protrudes from the rising portion 28, and the ellipsoidal cylindrical elbow strut 17 is fitted into the small-diameter portion 28a.

  As shown in FIG. 4B, a nut plate 30 is welded to the lower part inside the elbow strut 17, and the rising portion 28 and the nut plate 30 of the bracket portion 16 are bolts inserted into the rising portion 28 from below. 31 is fastened. A downward groove 33 is formed in the bracket portion 16 so as to extend to the left and right in a state where the bracket portion 16 communicates with the hole 32 in which the bolt 31 is fitted. This is to suppress the material of the bracket portion 16.

(3) Armrest mounting structure (2)
A boss portion 35 that can be fitted into the recess 24 of the back frame member 7 is formed integrally with the bracket portion 16 constituting the elbow support 15. The boss portion 35 also has a step portion 36 that fits into the opening step portion 25 of the recess 24. The boss portion 35 has a tapered shape in which the entire outer periphery is squeezed toward the tip, following the recess 24 of the back frame member 7. Further, since the recess 24 has the stepped portion 23, the boss portion 35 has an overhanging portion 35a that protrudes toward the front side.

  For example, as can be understood from FIG. 5, the recess 24 of the back frame member 7 and the boss portion 35 of the bracket portion 16 have a trapezoidal shape in a side view so that the front-rear distance between the lower surfaces is increased. Since a downward load acts on the armrest device 13, the resistance of the recess 24 and the boss portion 35 increases as the area of the lower surface increases. In this embodiment, the recess 24 and the boss portion 35 Since the area of the lower surface is large, the load support function is high. This is one of the advantages of this embodiment.

As shown in FIGS. 3, 4, 7, and 8, a substantially U-shaped cover (spacer) 37 is fitted into the boss portion 35 of the bracket portion 16 from the front end side (in FIG. 3 , The cover 37 is drawn to a slightly larger scale than the bracket portion 16). For example, as can be understood from FIG. 3, the boss portion 35 is formed with a recess 38 in which the cover 37 is fitted so that it cannot be displaced forward and backward. The cover 37 is made of a synthetic resin. For example, as shown in FIG. 9, left and right longitudinal ribs 39 project from the upper and lower surfaces.

For example, as shown in FIG. 8, the location of recess 38 of the boss portion 35 of the bracket part 16, a nut (hexagonal nut) 40 and the nut hole 41 of the circle upward opening fitted unrotatably, it communicates with the nut hole 41 Thus, an upper bolt hole 42 that opens up and down is vacant.

  On the other hand, in the bottom wall part (lower surface part) 43 constituting the lower part of the recess 24 in the elbow receiving part 21 in the back frame member 7, a lower bolt hole 45 through which a bolt 44 can be inserted from below, A downwardly facing counterbore hole 46 communicating with the bolt hole 45 is formed. As shown in FIG. 4A and FIG. 7, the counterbore hole 46 is a long hole extending long in the left-right direction (the insertion / removal direction of the boss portion 35). Further, as shown in FIG. 8, the counterbore hole 46 is formed in a tapered shape whose inner diameter increases toward the lower side (opening edge).

  As shown in FIG. 8, the bolt 44 used for fastening the boss portion 35 is a socket bolt with a hexagonal hole, and the bolt 44 is a nut 40 through a hook-like washer 47 with a downward opening having a tubular portion 47a. Screwed into. The tubular portion 47 a of the washer 47 has a taper shape that expands downward at a ratio substantially equal to the inner diameter of the countersink hole 46, and the washer 47 is in close contact with the lower surface of the countersink hole 46. The left and right outer surfaces and the left and right inner surfaces of the counterbore hole 46 are always in close contact with each other.

  For example, as shown in FIG. 8, an upward claw 37 c is formed at the tip of the lower plate of the cover 37, while an engagement groove 35 a into which the upward claw 37 c is fitted is formed in the boss portion 35 of the bracket portion 16. ing. In addition, a downward claw 37 d that fits and engages with the leading edge of the nut hole 41 in the boss portion 35 is formed on the upper plate of the cover 37. For this reason, the cover 37 is attached to the boss portion 35 so as not to be detached. The same effect can be obtained even if only one of the nails is provided.

(4) Summary As can be understood from the above description, since the outer peripheral surface of the washer 47 and the inner peripheral surface of the counterbore hole 46 are inclined with respect to the axial center of the bolt 44, the armrest device 1. When the bolt 44 for attaching the screw is screwed in, the washer 47 and the bolt 44 are moved toward the inner side of the recess 24 due to the wedge action, so that the boss portion 35 of the elbow support 15 is also recessed together with the bolt 44. It moves toward the back side of 24. As a result, the boss portion 35 is held in a state of being fitted in the recess 24.

When the bolt 44 is screwed and the washer 47 is overlapped with the bottom surface of the counterbore 46, the boss portion 35 is in the recess 24, but it is made of a synthetic resin as in this embodiment. When used with the cover 37, since the cover 37 is somewhat deformed, it is absorbed machining error of each member and the bolt 44 screwing full until the rotation stops, the boss portion 35 to tightly in the recess 24 fitting To do.

  Since the lower bolt hole 45 of the bottom surface portion 43 in the elbow receiving portion 21 is a long hole, the bolt 44 is not hindered from moving (sliding) by tightening. Moreover, since the bolt 44 can be reliably screwed into the nut 40 from the lower bolt hole 45 which is a long hole at the beginning of the mounting of the armrest device 1, the mounting operation of the armrest device 1 is very simple. That is, the initial positioning of the boss portion 35 can be performed very easily, and the boss portion 35 can be firmly fixed to the elbow receiving portion 21 only by screwing the bolt 44.

  The upper surface plate of the cover 37 has a hexagonal hole 37a, and the lower surface plate has a bolt insertion hole 37b. And the magnitude | size of the hexagonal hole 37a is made smaller than the nut 40, or the hexagonal hole 37a is shifted from the nut 40 by planar view. For this reason, the nut 40 does not come out upward due to the obstruction of the top plate of the cover 37. That is, the cover 37 is also used to prevent the nut 40 from coming off. The upper surface plate of the cover 37 may be a flat plate with no holes.

  When the opening step portion 25a of the recess 24 and the step portion 36 of the boss portion 35 are fitted as in the present embodiment, the boss portion 35 and the elbow receiving portion 21 are fitted more and more firmly, so that the fastening strength is further increased. Not only is it excellent, but the appearance of the boss 35 and the elbow rest 21 is integrated, and the appearance is further improved.

(5). Others The present invention can be embodied in various ways other than the above embodiment. For example, the armrest device 1, and so on or fastened to the rebates scan entered into the outer member forming the seat, it is possible to conclude the members other than the back frame member. The recesses (and the bosses) need only have tapered portions on their inner peripheral surfaces, and do not need to be tapered on the entire circumference.

Also, by forming an internal thread on the ball scan section, it is possible to screw a bolt directly thereto.

(A) is a perspective view of a chair, (B) is a right view of a chair. FIG. 6 is a perspective view of a back frame material 7. It is an isolation | separation perspective view of the principal part of an armrest apparatus. (A) is a separated top view of an armrest device and a back frame material, (B) is a BB view sectional view of (A) in the state where an elbow support was attached. It is a partial side view of a back frame material. It is a partial bottom view of a back frame material. It is a separation top view in the state where a back frame material was fractured. FIG. 5 is a cross-sectional view taken along the line VIII-VIII in FIG. 4 during the attachment of the bracket portion. FIG. 9 is a cross-sectional view taken along the line IX-IX in FIG. 8.

7 Back frame material 8 Back strut 13 Armrest device 14 Elbow rest 15 Elbow support 16 Bracket part 17 Elbow strut 21 Elbow support part
24 recesses 35 boss part 37 cover 40 nut 43 bottom plate part 44 bolt 45 lower bolt hole 46 countersink hole 47 washer
47a Washer tube

Claims (2)

An elbow device provided with an elbow rest on the upper end of the elbow support; and an elbow support to which the lower end of the elbow support is fixed;
The elbow support part has a recess into which the boss part formed at the lower end part of the elbow support fits, and by forming the recess of the elbow support part and the boss part of the elbow support in a tapered shape, The boss part and the recess are fitted exactly,
Furthermore, the appropriately portion of the wall forming the inner periphery of the recess of the elbow receiving portion, and a bolt hole that can inserting bolts is provided from a direction intersecting the insertion direction of the boss portion, the bolt hole securing the boss portion of the elbow support receiving portion elbow by inserting the bolts,
The structure
The bolt is fitted with a bowl-shaped washer having a cylinder part into which the head of the bolt is fitted, and the cylinder part of the washer is formed in a tapered shape whose outer diameter decreases toward the tip of the bolt. On the other hand, the elbow support part has a tapered countersink hole into which the washer fits. When the bolt is screwed, the outer peripheral surface of the washer hits the inner peripheral surface of the countersink hole and the washer and By moving the bolt to the back side of the recess, the elbow support is moved to the back side of the recess.
Chair with armrest device. Furthermore, a base supported by leg posts is provided, and a back frame material for attaching a backrest is connected to the base so as to be able to tilt backwards. By forming a recess having an inner peripheral surface, a part of the back frame material is the elbow receiving portion, while the boss portion of the elbow support is fitted in the recess from the lateral direction,
Wherein the bottom wall portion defining a lower surface of the recess of the back frame member, that vacant and the bolt holes of the upper and lower openings communicating hole counterbore downwardly below the spread tapered the seat that opens and thereto,
The chair with an armrest device according to claim 1.

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