JP5616406B2 - Chair - Google Patents

Description

  The present invention relates to a chair that can adjust the height of an armrest stepwise by a simple operation.

  Some high-grade office chairs are provided with a seat plate height adjustment mechanism and a back plate reclining mechanism, as well as an armrest device that can adjust the height of the armrest.

  As a conventional example of this type of armrest device, for example, there are those described in Patent Documents 1 to 3 below.

  Each of these consists of a cylindrical lower support that stands up from the side of the seat plate and an upper support that has an armrest on its upper surface, and the upper support is slid vertically on the lower support. The engagement shaft (or engagement pin) provided in the upper support is moved in the front-rear direction by operating an operation lever that has an operation part that is externally fitted and protrudes from the side surface of the upper support. By selectively engaging the engagement shaft with any one of the upper and lower multi-stage engagement holes communicating with the vertical communication hole formed inside the lower support, the upper support is It is designed to be held in a height position.

Among them, in Patent Documents 1 and 2, the member that moves the engagement shaft back and forth is formed in an inverted U shape in a side view, integrally with the operation lever.
In Patent Document 3, the upper end of a rotary lever type operating rod holding the engaging pin at the lower end is pushed backward by the rear end of the push button type operating knob, so that the operating rod is The engaging pin is engaged with and disengaged from the engaging hole by rotating in the front-rear direction with the intermediate portion as a fulcrum.

JP-A-9-173178 JP 2000-279268 A JP 2005-185629 A

  However, in Patent Documents 1 and 2, the operating portion of the operating lever and the extending portion for moving the engagement shaft back and forth are integrated in an inverted U shape, and in the bent portion of the U shape, It is pivotally attached to the upper support with a pin, and the length from the pivot part of the extension part to the action point is long, so if excessive force is applied to the operation part during operation, The intermediate portion of the pivot attachment portion and the extension portion is easily deformed or damaged, and therefore, this member needs to be made of a highly rigid material.

  Moreover, in the thing of patent document 3, since only the rear end of the operation knob is made to contact the front surface of the upper end portion of the operation rod, the operation knob and the operation rod are not reliably linked. When the engagement pin gets caught in one of the engagement holes and the operation rod cannot be restored, the operation knob is swung away, making it impossible to operate, or the structure of the means for restricting the forward / backward movement of the operation knob is complicated. There is a problem that high accuracy is required.

  In view of the above-mentioned problems of the prior art, the present invention is less likely to be damaged or deformed even if an excessive force is applied to the operation lever, and the structure and assembly are simple and reliable. An object of the present invention is to provide a chair provided with the armrest device.

According to the present invention, the above problem is solved as follows.
(1) An armrest strut standing up from the side of the seat, an armrest support rod fitted to the armrest strut so as to be movable in the vertical direction and adjustable in the vertical direction, and an upper end of the armrest support rod In a chair comprising a supported armrest and a height adjusting device for adjusting the vertical position of the armrest supporting rod, the height adjusting device pivots on the armrest supporting rod with an axis facing in the left-right direction. The upper and lower parts are disposed in the armrest support rod so that the upper and lower parts can be rotated in the front-rear direction around the worn operation lever and the middle part in the vertical direction, and the upper end is pivoted in the vertical direction of the operation lever. Linked to the operation lever, a rotation lever linked to the operation lever, a plurality of engaging portions provided in the upper and lower stages on the armrest post, and the rotation lever The height of the armrest support rod provided for the armrest post Accordingly, the engaging member that can be selectively engaged with and disengaged from the plurality of engaging portions and the rotating lever are urged toward the direction in which the engaging member engages any of the engaging portions. And a shaft portion facing in the left-right direction is provided on one of the rear portion of the operation lever and the upper portion of the rotation lever, and the rotation lever is disposed above the lower end of the armrest support rod. when pushed toward, by providing an engaging recess for engaging so as to sandwich the front and rear receiving said shaft portion, and said operating lever and the pivot lever, by upwardly rotating the operating lever, turning The levers are linked to each other so that the levers can be rotated in the front-rear direction to disengage the engaging members from the engaging portions.

  According to such a configuration, the operation lever and the rotation lever are separate bodies, the moment at the time of each rotation can be reduced, and even if an excessive force is applied to the operation lever at the time of unlocking operation, Since the moment is small, the risk of breakage and deformation can be reduced.

In addition, even if the operation lever and the rotation lever, which are conventionally integrated, are divided into two members, the operation lever is pivotally attached to the armrest support rod and positioned, and the rotation lever is connected to the armrest support rod. The rear end portion of the operating lever and the upper end portion of the rotating lever are engaged with each other via the engaging recess and can be easily assembled simply by inserting upward from the lower end of the lever.
Furthermore, since the rear end portion of the operation lever and the upper end portion of the rotating lever are engaged with each other via the engaging recess , the operation lever can be reliably operated and there is little risk of malfunction.

(2) In the above paragraph (1) , the middle part of the operation lever in the front-rear direction is pivotally attached to the armrest support rod with the axis pointing in the left-right direction, and the front portion of the operation lever is below the armrest from the armrest support rod. The operation portion protrudes forward, and the rear portion of the operation lever is connected to the upper end portion of the rotation lever.

  According to such a structure, the moment at the time of rotation of an operation lever can be made small.

  According to the present invention, it is possible to provide a chair that is less likely to be damaged or deformed even when an excessive force is applied to the operation lever, and that is simple in structure and assembly and that operates reliably.

It is a perspective view of one embodiment of a chair of the present invention. Similarly, it is a side view. It is a disassembled perspective view of an armrest apparatus. It is an expansion disassembled perspective view of the part of the height adjustment apparatus in an armrest apparatus. It is a disassembled perspective view which shows the state which attached some members from the state of FIG. 4 illustration. Similarly, it is a perspective view which shows an assembly completion state. It is the perspective view which looked at the completed armrest apparatus from diagonally downward. Similarly, it is a vertical side view.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of an embodiment of the chair of the present invention, and FIG. 2 is a side view of the same.
The chair includes a pillar 3 supported at the center of five radial rods 2 each having a caster 1 at the tip, a support base 4 provided at the upper end of the pillar 3, and the support. A seat 6 supported above the base 4 via a support link 5, a backrest 8 that is pivotally attached to the support base 4 with a shaft 7 facing in the left-right direction, and can be tilted backward, and both sides of the seat 6 ( And an armrest device 9 that stands up more than the other.

3 to 8 show details of the armrest device 9.
The armrest device 9 is an armrest support cylinder which is an armrest strut that stands up in a slightly forward tilted posture from the side of the seat 6 by fixing a bracket 10 provided on the inner surface of the lower end to the lower surface of the side of the seat 6. 11, a middle cylinder 12 fitted to the inner surface of the armrest support cylinder 11, and a cylindrical armrest that supports the armrest 13 and is fitted in the middle cylinder 12 so as to be slidable in the vertical direction. A support rod 14 and a height adjusting device 15 for adjusting the height of the armrest support rod 14 with respect to the armrest support tube 11 are provided.

  The armrest support cylinder 11, the middle cylinder 12, and the armrest support rod 14 have a cylindrical shape with an elliptical cross section in which the long axis facing the front-rear direction is slightly longer than the short axis facing the left-right direction. It is good also as a shape.

  The middle cylinder 12 is formed by facing and joining two halved pieces 12A and 12B divided into left and right parts. At the four corners of the opposing surfaces of both halved pieces 12A and 12B, positioning concave portions 16 and convex portions 17 are provided so as to be fitted to each other when they are in a proper positional relationship.

  An elastic locking claw 18 having a front-rear outward claw 18a at the lower end portion is provided at the lower end front and rear portions of the opposed portions of the half halves 12A, 12B. When the two sides of the elastic locking claws 18, 18 facing each other are bonded to each other, the two elastic locking claws 18, 18 that are joined to each other are closed on the lower end of the armrest support cylinder 11. By engaging and locking in an engagement hole 19 (see FIGS. 7 and 8) provided in the bottom wall 11a, the middle cylinder 12 can be supported by the armrest support cylinder without positional displacement of the half halves 12A and 12B. 11 is prevented from coming off.

  The height adjusting device 15 has an operation portion 21a that projects forward and downward through a notch 20 provided on the upper front surface of the armrest support rod 14, and a downward U-shaped engagement recess 21b at the rear end portion. And an operation lever 21 pivotally attached to the upper portion of the armrest support rod 14 with a shaft 21c whose middle portion faces in the left-right direction, and a substantially rhombus whose side shape is long in the vertical direction. A shaft portion 22a facing in the left-right direction, which is fitted in the armrest support rod 14 and is received in and engaged with the engagement recess 21b of the operation lever 21, is provided at the upper end portion. An intermediate portion of an engagement pin 24, which is an engagement member that penetrates the armrest support rod 14 in the left-right direction, passes through a long hole 23 facing in the front-rear direction provided on both side walls slightly below the armrest support rod 14. Pin insertion hole 22b facing left and right is provided Engagement provided so that each end of the rotation pin 22 and the engagement pin 24 provided on each half piece 12A, 12B of the middle cylinder 12 and projecting on both sides of the armrest support rod 14 is fitted. Hole 25.

  The operating lever 21 is fitted with a pair of left and right concave portions 26 provided on the opening edge of the upper end of the armrest support rod 14 from above, with shafts 21c projecting on both side surfaces of the intermediate portion from above. 21 is brought into contact with the lower surface of the closing member 27 that closes the upper end opening of the armrest support rod 14, so that the shaft 21 c is prevented from coming off from the recess 26, and is placed on the upper portion of the armrest support rod 14. It can be easily installed.

  In the middle of the pivot lever 22 in the vertical direction, it is inscribed in the front and rear inner surfaces of the armrest support rod 14 and protrudes forward and backward in the portion corresponding to the top of the rhombus in the same arc shape. The bulging portion 22c is provided, and the turning lever 22 can be turned in the armrest support rod 14 around the center of curvature of the bulging portion 22c without any special pivot. .

  Engagement holes 25 provided in each of the half pieces 12A and 12B have a long hole-shaped connecting hole 25a facing the axial direction of the middle cylinder 12, and a forward groove on the front edge thereof. When the end portions of the engagement pin 24 which are formed in a plurality of shapes and protrude from the armrest support rod 14 on both sides are fitted in the communication holes 25a, the engagement holes 25a are engaged. The pin 24 and the armrest support rod 14 can freely move in the vertical direction with respect to the middle cylinder 12 and the armrest support cylinder 11, and the engagement pin 24 engages with any of the engagement portions 25b. In this case, the vertical movement of the engagement pin 24 and the armrest support rod 14 is prevented.

An elastic tongue piece 28 is formed integrally with the lower end portion of the rotating lever 22 so as to face the rear upper side, and the distal end portion of the elastic tongue piece 28 comes into pressure contact with the inner surface of the rear portion of the armrest support rod 14. As shown by a solid line in FIG. 8, the rotation lever 22 is always urged toward a locking position where the engagement pin 24 engages with any engagement portion 25 b in the engagement hole 25.
That is, the elastic tongue piece 28 constitutes an urging means for urging the rotation lever 22 in a direction in which the engagement pin 24 engages with any one of the engagement portions 25b.

  Therefore, as indicated by the solid line in FIG. 8, the engagement pin 24 is normally engaged with one of the engagement portions 25b by the action of the biasing means, and the armrest 13 corresponds to the engagement portion 25b. The operation lever 21 is positioned at a non-operation position where the operation portion 21a protrudes forward and downward from the notch 20.

When it is desired to change the height of the armrest 13 from this state, first, the operating portion 21a of the operating lever 21 is resisted against the urging force of the elastic tongue piece 28 from the non-operating position by an imaginary line in FIG. As shown, it is turned upward toward the upper operating position.
Then, the engaging recess 21b at the rear portion of the operation lever 21 rotates forward, and accordingly, the rotating lever 22 in which the engaging recess 21b and the shaft portion 22a at the upper end are engaged is imagined in FIG. As indicated by the line, the pin is rotated counterclockwise, and the engagement pin 24 is disengaged from the engagement portion 25b of the engagement hole 25 and moved to a lock release position that fits in the communication hole 25a. It is done.

Next, the armrest 13 and the armrest support rod 14 are raised or lowered to a desired height while the operation portion 21a of the operation lever 21 is held at the operation position.
At this time, since the engagement pin 24 is located in the communication hole 25a, the engagement pin 24 can freely move up and down in the communication hole 25a.

  After reaching the desired height, when the hand is released from the operating portion 21a of the operating lever 21 or the operating force is loosened, the rotating lever 22 is returned to the original locking position by the biasing force of the elastic tongue piece 28. The engagement pin 24 is engaged with the closest engagement portion 25b at that time. In addition, what is necessary is just to move the armrest 13 to the some up and down direction, when the engaging pin 24 does not engage one of the engaging parts 25b appropriately.

  When the engaging pin 24 is properly engaged with one of the engaging portions 25b and the rotating lever 22 is returned to the locking position, the operating lever 21 is also returned to the non-operating position.

  Further, when assembling the armrest device 9, the operation lever 21 is mounted on the armrest support rod 14, the operation lever 21 is positioned, and the rotation lever 22 is directed upward from the lower end of the armrest support rod 14. The rear end portion of the operation lever 21 and the upper end portion of the rotation lever 22 are engaged with each other via the engagement recess 21b, and the elongated hole 23 of the armrest support rod 14 and the rotation lever 22 are It can be easily assembled with the pin insertion hole 22b aligned. At this time, the operation lever 21 is positioned at the non-operation position by its own weight by forming the operation portion 21a so that the center of gravity is located closer to the operation portion 21a than the shaft 21c. Since the elastic tongue piece 28 is positioned at the locking position by pressing the elastic tongue piece 28 against the inner surface of the rear portion of the armrest support rod 14, it is not necessary to provide special positioning means for the operation lever 21 and the rotation lever 22. .

  In this state, after the engaging pin 24 is passed through the elongated hole 23 of the armrest support rod 14 and the pin insertion hole 22b of the rotating lever 22 that are aligned with each other, both the half pieces 12A, 12B are faced to each other and both ends of the engagement pin 24 are engaged with a predetermined engagement portion 25b so as to be joined with the armrest support rod 14 interposed therebetween, and these are joined together to form an armrest support cylinder 11. By inserting the elastic locking claws 18 and 18 corresponding to the left and right jointed with each other into the engagement hole 19 in the bottom wall 11a of the armrest support cylinder 11, the screw or the like is completely removed. Without use, the armrest support cylinder 11, the middle cylinder 12, the armrest support rod 14, the operation lever 21, the rotation lever 22 and the like can be easily and reliably assembled.

  Since the armrest 13 is not directly related to the present invention, a detailed description thereof will be omitted, but in this example, as shown in FIG. 3, the armrest substrate 29, the tilt member 30, the fixed disk 31, the core The material 32, the cushion material 33, and the armrest pad 34 are sequentially stacked and united so that the material 32, the cushion material 33, and the armrest pad 34 can be turned in the left-right direction and can be translated in the left-right direction.

In the above-described embodiment, the split cylinder tube 12 is provided as a separate body in the armrest support cylinder 11, but the middle cylinder 12 is eliminated and the armrest support cylinder 11 has the function of the cylinder 12. It may be.
Further, a shaft portion that faces in the left-right direction is provided at the rear end portion of the operation lever 21, and when the rotation lever 22 is pushed into the upper end portion of the rotation lever 22 upward from the lower end of the armrest support rod 14, You may provide the upward U-shaped engagement recessed part which received the axial part and engaged.

DESCRIPTION OF SYMBOLS 1 Caster 2 Leg rod 3 Leg column 4 Support base 5 Support link 6 Seat 7 Axis 8 Backrest 9 Armrest device 10 Bracket 11 Armrest support cylinder (armrest support)
11a bottom wall 12 middle cylinder 12A, 12B half piece 13 armrest 14 armrest support rod 15 height adjusting device 16 recess 17 convex portion 18 elastic locking claw 18a claw 19 engagement hole 20 notch 21 operation lever 21a operation portion 21b Joint recess 21c shaft 22 Rotating lever 22a Shaft portion 22b Pin insertion hole 22c Swelling portion 23 Long hole 24 Engaging pin (engaging member)
25 engaging hole 25a connecting hole 25b engaging portion 26 recess 27 closing member 28 elastic tongue piece (biasing means)
29 Armrest substrate 30 Tilt member 31 Fixed disk 32 Core material 33 Cushion material 34 Armrest pad

Claims (2)

Armrests that stand up from the side of the seat,
An armrest support rod fitted to the armrest strut so as to be movable in the vertical direction and adjustable in the vertical position;
An armrest supported on the upper end of the armrest support rod;
In a chair provided with a height adjusting device for adjusting the vertical position of the armrest support rod,
The height adjusting device is
An operation lever pivotally attached to the armrest support rod with a shaft facing in the left-right direction;
The upper and lower parts are pivotable in the front-rear direction around the middle part in the vertical direction, and are arranged in the armrest support rod, and the upper end part is linked to the vertical movement of the operation lever in the front-rear direction. A rotation lever linked to the operation lever,
A plurality of engaging portions provided in the upper and lower multi-stage shape on the armrest post;
An engagement member that is provided on the rotating lever and can be selectively engaged with and disengaged from the plurality of engagement portions according to the height of an armrest support rod with respect to the armrest support;
Biasing means for biasing the rotating lever toward a direction in which the engaging member engages with any one of the engaging portions;
When either one of the rear part of the operation lever and the upper part of the rotation lever is provided with a shaft part facing in the left-right direction, and the other side, when the rotation lever is pushed upward from the lower end of the armrest support rod, by providing an engaging recess for engaging so as to sandwich the front and rear receiving said shaft portion, and said operating lever and the pivot lever, by upwardly rotating the operating lever, turning lever, the engagement A chair that is linked to each other so that the member can be rotated in the front-rear direction to disengage the member from the engaging portion. An intermediate portion in the front-rear direction of the operation lever is pivotally attached to the armrest support rod with an axis directed in the left-right direction, and the front portion of the operation lever is an operation portion that projects forward from the armrest support rod below the armrest, and the rear portion of the operation lever, according to claim 1 Symbol mounting chairs coupled with the upper end portion of the rotating lever.

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