JP2006101929A - Armrest for office chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an armrest for an office chair and the office chair effectively utilizing an office space and suitably used by each user. <P>SOLUTION: This armrest for the office chair is provided on a chair C movable on a floor, and is provided with at least an armrest pad 2 for resting an elbow of a person sitting on the chair, an elbow support 1 supporting the armrest pad 2, a raising/lowering mechanism H raising/lowering the elbow pad relative to a seat face in a use attitude U where the armrest pad 2 becomes approximately horizontally, and a turning mechanism R turning the armrest between the use attitude and a retreat attitude V raising the armrest pad 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an armrest suitable for use in a movable office chair used in an office.

Conventionally, office chairs used in offices are often provided with armrests for leaning the user's elbow when seated, and among the armrests, the elbows of users with different physiques are preferably used. In order to lean, an elbow rest that can be raised and lowered has been proposed (see, for example, Patent Document 1). Such a chair can appropriately lean on the elbow according to the physique of each user by appropriately adjusting the height of the elbow rest according to the physique of the user.
JP 2001-186960 A

  Here, since the work space is generally limited in the office, when the chair user is absent, the seat of the chair is pushed into the lower limb space of the desk and stored, and the chair and the space around the desk are stored in other places. It is preferable that it can be effectively utilized by the user. However, in the case of a chair having an armrest as disclosed in Patent Document 1, depending on the height of the armrest, the armrest interferes with the top plate of the desk, and the seat and the armrest cannot be stored in the lower limb space. It can happen. Of course, if the armrest height is set low, it may be possible to place the armrest into the lower limb space with the seat, but if this is done, the user will be able to set the armrest height position every time he sits down. Must be set again. In addition, when a drawer or the like is further arranged below the top of the desk, even if the elbow rest is set to the lowest height, the elbow rest interferes with the drawer and the seat cannot be stored in the lower limb space. Can happen. Such a problem is particularly remarkable in a small office.

  The present invention pays attention to such inconveniences, and includes an armchair for an office chair that can be suitably used by each user while contributing to effective utilization of an office space with limited space, and the armrest. Provide office chairs to do.

  In order to achieve such an object, the present invention takes the following measures. That is, the armchair for an office chair according to the present invention is provided on an office chair movable on the floor, and includes at least an elbow rest for leaning a seated person's elbow and an elbow strut that supports the elbow rest. An armrest, wherein the elbow rest is between a lifting mechanism that can lift and lower the elbow rest with respect to a seat surface in a use posture in which the elbow rest is substantially horizontal, and a retracted posture in which the elbow rest is raised. It has the elbow rest including all or a part of the elbow strut, or a pivot mechanism that pivots only the elbow rest.

  If this is the case, the height of the elbow rest can be raised and lowered with respect to the seating surface by the lifting mechanism, while maintaining the state of setting the desired height according to the position of the user's elbow, The armrest can be in a retracted position by a pivoting mechanism that pivots only the elbow support, including the elbow rest, or only the elbow rest. The space around the desk can be effectively utilized by being pushed into the lower limb space, and can be suitably applied in an office where the work space and the movement space for people are limited.

  In order to ensure a larger lifting stroke of the elbow rest surface, which is the upper surface of the elbow rest, it is possible to form a receiving portion that opens downward and accommodates the upper end portion of the elbow strut inside the elbow rest. desirable. More specifically, it is possible to make the lifting stroke amount larger than that of the conventional product by housing a part of the lifting mechanism in the housing portion. Further, in order to make the lifting mechanism compact, the rotation mechanism has a rotation base end set at the base end of the elbow post, and the elbow support is based on the rotation base end. And a support member that is fixed to the elbow rest and that partially covers the support body and is slidable in the longitudinal direction of the support body. It is desirable that the mounting height position of the cover member with respect to the column main body is adjusted between the main body and the cover member. In addition, in order to be able to set the lifting mechanism to a desired height position, the engaged member in which a plurality of engagement holes having different height positions are formed in either one of the column main body and the cover member. An engaging member having an engaging claw selectively engageable with the engaging hole on the other of the support body and the cover member; and the engaging claw in the engaging hole It is desirable to provide an urging means for urging the engaging member in a direction that can be engaged, and to be able to release the engagement state between the engagement claw and the engagement hole by a predetermined operation force.

  As a specific configuration for effectively providing an elevating mechanism on such a compact elbow post, a receiving portion that opens downward and accommodates the upper end portion of the cover member is formed inside the elbow rest. It is desirable. Further, in order to make it easy for the user to handle, the engaged portion is provided on the column main body, the engaging member is attached to the cover member, and the side surface of the cover member is below the elbow rest. It is desirable to provide an operation button capable of releasing the engagement between the engagement member and the engagement hole by pressing the engagement member against the urging direction of the urging means. Furthermore, in order to set a large sliding range in which the column main body slides in the cover member, it is preferable that the biasing means is disposed at the upper end portion of the cover member housed in the housing portion. In addition, even if the position of the urging means is set at the upper end of the cover member, in order to achieve a suitable engagement state between the column main body and the cover member, the urging means is urged at the upper end portion of the engaging member. It is preferable that the engaging claw is provided at a lower end portion of the engaging member and the engaging claw is engaged with the engaging hole.

  In order to make the elbow strut compact and thus the whole armrest compact, a pivot base end having a pivot center in the pivot mechanism is provided above the seat surface of the seat of the office chair. It is desirable that On the other hand, some office chairs have a shaft for attaching an armrest to the chair below the seat, and the user frequently takes off and seats by rotating the entire armrest including the armrest around the shaft. What is obtained is disclosed (see, for example, Japanese Patent No. 2838489). In the case of such a chair, the chair is rotated from the axis which is the base end of the elbow rest lower than the seat surface over the elbow rest. Therefore, it requires a large working force, and the turning radius increases, making it unsuitable for offices with limited space.

  In order to make the configuration of the office chair in the retracted posture compact so as not to hinder the operation of the user's seat in the retracted posture, the elbow rest and the elbow are in the retracted posture. It is preferable that the column is substantially overlapped with the side surface of the back of the office chair when viewed from the side.

  Since the armchair for an office chair according to the present invention is provided with both a lifting mechanism and a turning mechanism, it is desirable that the height of the armrest can be raised and lowered with respect to the seating surface to match the physique of the user. The armrest can be in a retracted position while maintaining the state set at the height position, so that the space around the desk is effective by pushing the chair into the lower limb space to place the seat in the lower limb space of the desk Therefore, the present invention can be suitably applied in an office where work space and human movement space are limited.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows a chair C as an office chair according to the present embodiment. The chair C is configured to be movable, for example, preferably used in an office, and includes a leg L having leg blades L1 having casters cs and leg posts L2, and a seating load by the user. A seat part S composed of a seat body S1 and a seat receiver S2 that supports the seat body S1 from below, and a back part B supported at the lower end by a pair of left and right support frames F rising from the left and right sides of the seat part S. When the reclining operation is performed with the back portion B tilted backward, a circular rotational support portion located above the seat surface SS of the seat portion S and in the vicinity of the upper end of the support frame F is provided. A tilt mechanism that tilts backward about T is employed. Then, a pair of armrests E, which will be described in detail later, rises symmetrically from the pair of rotation support portions T.

  Here, the armrest E includes an elevating mechanism H that can raise and lower the elbow rest 2 with respect to the seat surface SS in a use posture (U) in which the later-described elbow rest 2 is horizontal, the use posture (U), and the A rotation mechanism R for rotating the elbow post 1 including the elbow rest 2 between the side face of the back B of the chair C and the substantially superposed retracted posture (V). It is what.

  Hereinafter, a specific structure of the armrest E will be described in detail with reference to FIGS. 2, 3, and 4. In addition, in each figure after FIG. 2, the illustration of the cap cp attached to the base end part of the armrest E which is the outer side surface of the rotation support part T shall be abbreviate | omitted.

  The armrest E includes an elbow rest 2 for leaning a seated person's elbow and an elbow support 1 that rises from the rotation support portion T and supports the elbow rest 2 as described above.

  The elbow strut 1 includes a strut body 11 that rises with the rotation support portion T as a base end, and a cover member 15 that has an upper end fixed to the elbow rest 2 and is detachably fitted to the outside of the strut body 11. have.

  The column main body 11 has a rotation base end portion 12 which can be attached to a rotation support portion T provided on the frame F on the lower end side. As shown in FIG. 2, the rotation base end portion 12 includes an attachment portion 13, a fixing plate 14, and three bolts b. The attachment portion 13 is formed with a recess 13a on the outside where the rotation support portion T and the fixing plate 14 can be fitted, and a recess 13b (FIG. 5) on the inside where the rotation support portion T can be fitted. Three sliding holes 131 into which the insertion cylinder 142 of the plate 14 can be inserted are formed. In addition, a positioning recess 132 that is a circular recess for positioning the fixed plate 14 is formed in the center of the mounting portion 13. The fixed plate 14 is mainly composed of a disk-shaped plate member 140 in which three bolt holes 141 are perforated, and the three insertion cylinders 142 provided on the plate member 140 are attached to the plate member 140 by welding, for example. One bolt hole 141 is attached in communication. In addition, a positioning convex portion 143 that is raised in a truncated cone shape that can be closely fitted to the positioning concave portion 132 described above is formed in the central portion of the plate member 140. Note that, instead of the insertion tube 142 and the bolt b in the present embodiment, a stepped bolt in which a screw process is applied only to the tip portion of the plate member 140 having the three bolt holes 141 may be used.

  In addition, as another aspect of attaching the attachment portion 13 to the rotation support portion T, a configuration in which the attachment portion 13 is attached via a separate reinforcing metal fitting can be exemplified. For example, the rotation support portion T and the reinforcing bracket are firmly attached using three bolts in the vicinity of the circumferential portion, and the attachment portion 13 is reinforced using one bolt at the center portion of the rotation support portion T. It attaches to a metal fitting, and it is set as the aspect comprised so that rotation is possible by using the said one bolt as a fulcrum. If it is such, the attachment part 13 is correctly attached to the center of the rotation support part T with the one bolt by accurately attaching the attachment part 13 with one bolt at the center part of the rotation support part T. Positioning will be performed. In this case, the rotation range of the armrest E is set by rotating the heads of the three nuts with the reinforcing brackets attached to the circular support portion T at the rotation end in the use posture (U) and the retraction posture (V). It is desirable to provide a sliding groove on the mounting portion 13 side that can be brought into contact with each other at the moving end. The shape of the sliding groove is a shape corresponding to the sliding hole 131 described above.

  Here, the rotation base end portion 12 of the column body 11 can be rotated around the rotation support portion T by attaching the rotation base end portion 12 as follows. The mechanism R is configured. That is, the insertion tube 142 of the fixed plate 14 is inserted into the three sliding holes 131 formed in the attachment portion 13 and the plate member 140 is fitted in the outer recess 13 a provided in the attachment portion 13. The bolt b is inserted through the bolt hole 141 and the insertion tube 142 of the plate member 140, respectively. Next, in this state, the inner recess 13b provided in the attachment portion is fitted into the rotation support portion T, and the three insertion holes 142 are inserted into the three nut holes Tn provided in the rotation support portion T. The rotation base end portion 12 is rotatably attached to the rotation support portion T by screwing the front end of the bolt b. At this time, the positioning convex portion 143 provided at the center of the fixed plate 14 rotates while closely fitting the positioning concave portion 132 provided at the mounting portion 13, so that the rotational center of the rotational base end portion 12 is accurately set. Is positioned. Further, since the three bolts b and the nut holes Tn are screwed together with an appropriate strength, friction occurs when the attachment portion 13 is sandwiched between the fixed plate 14 and the rotation support portion T. The armrest E can be rotated with an appropriate resistance. As described above, the rotation base end portion 12 rotates around the rotation support portion T positioned above the seat surface SS, so that the rotation base end portion 12 is rotated by the rotation mechanism R according to the present invention. Is configured. The turning mechanism R can take the use posture (U) shown in FIG. 3 where the elbow rest 2 is horizontal and the retracted posture (V) where the elbow rest 2 stands as shown in FIG. ing. In particular, in this retracted posture (V), the armrest E is substantially overlapped with the side surface of the back B as viewed from the side surface. 3 and 4, the illustration of the plate member 140 is omitted, and the sliding hole 131 and the insertion tube 142 are schematically shown. In addition, the sliding hole 131 is provided with a protrusion that can contact the insertion tube 142 in the vicinity of the end that can contact the insertion tube 142 in the use posture (U) and the retracted posture (V), respectively. When the insertion tube 142 is rubbed against the protrusion when the arm is rotated, the user sets the armrest E so as to feel a slight resistance just before the armrest E becomes the use posture (U) and the retracted posture (V). Yes. Due to this sense of resistance, the armrest E can be lightly fixed and stabilized in the use posture (U) and the retracted posture (V), and the user can determine the position where the armrest E is rotated when the armrest E is rotated. You can know it with a sense of click. In addition, the said protrusion is employable also in the aspect using the stepped bolt mentioned above, and the aspect which forms a sliding groove | channel.

  On the other hand, as shown in FIGS. 5, 6, and 7, the column main body 11 is formed on the inner upper portion with a cover that includes seven engagement holes 116 a that can be engaged with an engagement member 17 described later and that have different height positions. The engaging portion 116 is formed along the longitudinal direction of the column main body 11. Further, a recess 11a is formed in the upper end portion of the column main body 11 to avoid interference with a coil spring 18 which is an urging means described later when the armrest E is most contracted. On the other hand, as particularly shown in FIG. 7, the cover member 15 is engaged with a slide protrusion 16b2 to be described later in order to accurately slide the cover member 15 from the outer upper portion of the column main body 11, specifically, from the vicinity of the upper end to the upper third. A matching slide groove 117 is provided along the longitudinal direction of the cover member 15.

  As shown in FIGS. 5, 6, and 7, the cover portion 15 mainly includes a cover body 16 that can accommodate a part including the upper end portion of the support body 11. The cover body 16 includes the cover body 16 and the support body 11. An engagement member 17 that can be engaged with the formed engaged portion 116, a coil spring 18 that will be described later for maintaining the engagement, and an operation that can release the engagement between the engagement member 17 and the engaged portion 116 A button 19 is attached.

  As shown in FIG. 7, the cover main body 16 is mainly constituted by an inner cover 16a and an outer cover 16b. A button hole 16a1 is formed on the upper side of the inner cover 16a, and an operation button 19 is attached to the button hole 16a1. Further, a shaft attachment portion 16a2 for axially attaching the engagement member 17 is formed slightly below the button hole 16a1. On the other hand, a spring mounting portion 16b1 for supporting the coil spring 18 as a biasing means is formed at the upper end portion of the outer cover 16b, and the slide groove 117 provided in the column main body 11 described above is provided in the vicinity of the center portion of the outer cover 16b. A slide protrusion 16b2 that can slide inside is formed.

  The engaging member 17 has a shaft mounting portion 171 mounted on the shaft mounting portion 16a2 of the inner cover 16a described above, and the lower end portion of the engagement member 17 is engaged with the engaged portion 16 described above. A claw 17a is formed. The upper end portion of the engagement member 17 has a biased portion 172 that contacts the coil spring 18 from the inside, and in addition to the operation button 19 in contact with the operation button 19 slightly outside the biased portion 172. It has a pressed part 173 that receives the applied external force.

  The coil spring 18 is attached at one end to a spring mounting portion 16b1 formed on the outer cover 16b, and urges the urged portion 172 by elasticity at the other end side. Similar to a spring.

  The operation button 19 is attached to the upper portion of the inner cover 16a as described above, and presses the biased portion 172 of the engagement member 17 with a predetermined operation force, that is, an external force, against the biasing direction of the coil spring 18. An external force can be transmitted to the engagement member 17 to disengage the engagement claw 17a of the engagement member 17 from the engagement hole 161.

  The elbow rest 2 is attached to the upper and side faces, that is, the elbow rest main body 21 constituting the appearance of the elbow rest 2, the backing member 22 fitted into the elbow rest main body 21 from below, and the backing member. It mainly has a metal reinforcing member 23. In addition, a housing part 2a having a shape that swells downward is formed at a place where the upper end of the cover member 15 is fitted, and a part including the upper end of the cover member 15 is housed in the housing part 2a. In addition, a coil spring 18 that is an element of the lifting mechanism H is positioned in the accommodating portion 2 a via the cover member 15.

  The armrest E according to the present embodiment is supported from the lower side of the armrest 2 with the cover member 15 attached with the engagement member 17, the coil spring 18, and the operation button 19 fitted from the outside of the upper portion of the column main body 11. It is assembled and configured by being inserted into the accommodating portion 2 a formed on the member 22. In addition, as described below, the armrest E is a height position of the cover member 15 attached to the column body 11, that is, a height position of the armrest 2 relative to the seat surface SS between the column body 11 and the cover member 15. By being able to adjust, the raising / lowering mechanism H which concerns on this invention is comprised.

  Next, an operation and an operation mode when adjusting the height of the armrest E will be described in detail with reference to FIGS. 7, 8, and 9. First, in a state in which the operation button 19 is not pressed, the engagement claw 17a and the engagement hole 161 are engaged as shown in FIG. It is in a fixed state. Next, when the operation button 19 is pressed from the fixed state, the pressed portion 173 is pressed against the biasing force of the coil spring 18 applied to the biased portion 172 as shown in FIG. The engagement member 17 rotates about the shaft attachment portion 171 as an axis. Then, the engaging claw 17a located on the opposite side from the biased portion 172 via the pivot attachment portion 171 rotates in a direction away from the engaging hole 161, whereby the engaging claw 17a, the engaging hole 161, Is released, and the armrest 2 and the cover member 15 can slide with respect to the column main body 11 in the vertical direction and the tilt direction including the front-rear direction of the chair C. Then, while maintaining the state where the operation button 19 is pressed, the cover member 15 and the elbow rest 2 are slid obliquely upward along the longitudinal direction of the column main body 11 and then released from the operation button 19 at a predetermined position. As shown in FIG. 9, the engagement between the engagement claw 17a and the engagement hole 161 occurs again. In FIG. 9, the length of the armrest E in the height direction is extended and the armrest 2 and the cover member 15 are extended. Is fixed to the column main body 11. Further, in this series of operations, the slide protrusion 16b2 provided on the outer cover 16b accurately slides in the slide groove 117 of the column body 11, so that the elbow rest 2 and the cover member 15 are accurately along the longitudinal direction of the elbow column 1. Will go up and down.

  The armrest E used for the chair C, which is an office chair with the above-described configuration, includes an elevating mechanism H that can raise and lower the armrest 2 relative to the seat surface SS, a use posture (U), and a retracted posture (V). And a pivot mechanism R that pivots the elbow strut 1 including the elbow rest 2. Therefore, the elevation mechanism H can raise and lower the height dimension of the elbow rest 2 relative to the seat surface SS. The armrest E can be in the retracted position (V) by the rotation mechanism R that rotates the elbow strut 1 while maintaining the desired height position according to the physique of the user. An office where the chair C is pushed into the lower limb space of the desk so as to store the seat S in the lower limb space and can be used effectively, and the work space and the movement space of people are restricted. It can apply suitably in. Therefore, the chair C to which such an armrest E is applied can be suitably applied in an office where a work space or a movement space for people is limited.

  And since the accommodating part 2a opened downward was formed in the inside of the elbow pad 2, and the upper end part of the cover member 15 which is a part of the elbow support | pillar 1 is accommodated, in the cover member 15, in the accommodating part 2a Assuming that the height of the elbow rest surface, which is the upper surface of the arm rest 2, can be set low by the height of the housed, and that the armrest has a compact configuration in the vertical direction while ensuring a large lifting stroke of the arm rest 2. Yes. Further, since a part of the engaging member 17 constituting the lifting mechanism H and the coil spring 18 are disposed in the housing portion, the lifting mechanism is effectively disposed to contribute to the compactness of the elbow strut. Yes.

  In particular, the elbow strut 1 is fixed to the strut body 11 with the pivot base end 12 as the base end and the elbow rest 2 and partially covers the strut body 11 and can slide in the longitudinal direction of the strut body 11. And the elevating mechanism H is provided between the column main body 11 and the cover member 15 and adjusts the mounting height position of the cover member 15 with respect to the column main body 11. The structure itself is compact. Further, the strut body 11 is provided with an engaged portion 16 in which a plurality of engagement holes 161 are formed, and the cover member 15 is provided with an engagement member 17 having an engagement claw 17a and a coil spring 18 serving as an urging means. The mechanism H is configured so that the engagement state between the engagement claw 17a and the engagement hole 161 can be released by an external operation force, and the desired engagement hole 161 among the plurality of engagement holes 161 is engaged with the engagement claw 161. The elbow rest 2 can be suitably set to a desired height position by engaging 17a. Furthermore, an operation button 19 that can release the engagement between the engagement claw 17a and the engagement hole 161 against the coil spring 18 is provided below the elbow rest 2 in the cover member 15. Since the position follows the raising and lowering of the elbow rest 2, the user can perform the action of raising and lowering the height of the elbow rest 2 and the action of operating the operation button 19 together.

  And even if the base end portion 12 of the elbow strut 1 is set above the seat surface SS, the elbow rest 2 is preferably raised and lowered within the same range as an armrest provided on a conventional chair. No. 1 must be compact so as to be within the height range between the elbow rest 2 and the seat surface SS when the height position of the elbow rest 2 is set to the lowest. Therefore, in the present embodiment, the elevating mechanism is suitably formed with respect to the elbow strut 1 configured compactly by forming the accommodating portion 2a that opens downward and accommodates the upper end portion of the cover member 15 in the elbow rest 2. Application of H is realized. Further, since the coil spring 18 is disposed at the upper end portion of the cover member 15 accommodated in the accommodating portion 2a, the relative movement range of the column main body 11 in the cover member 15 can be set large. In addition, the coil spring 18 biases the upper end portion of the engagement member 17, the engagement claw 17 a is provided at the lower end portion of the engagement member 17, and the engagement claw 17 a is provided in the column main body 11. Since it engages with the hole 161, even if the position of the coil spring 18 is set at the upper end of the cover member 15, suitable engagement between the column main body 11 and the cover member 15 is realized.

  Further, since the rotation base end 12 having the rotation center in the rotation mechanism R is provided above the seat surface SS, the elbow support 1 can be configured compactly, and the armrest E as a whole is configured compactly. It is said. Furthermore, from this, the space for turning the armrest E can also be set compactly, and it can be suitably used even when the surrounding space is limited. In addition, since the part to be rotated is made compact, the working force required when the armrest E is rotated can be saved. Furthermore, since the elbow rest 2 and the elbow support 1 are substantially overlapped with the side surface of the back B when viewed from the side in the retracted position (V), the armrest E is the user of the chair C in the retracted position (V). It will not be a hindrance to seats. In particular, in a state where the armrest E is in the retracted posture (V) and the seat portion S is pushed into the lower limb space of the desk, the armrest E does not interfere with the desk and does not interfere with the surroundings.

  Although one embodiment of the present invention has been described above, the specific configuration of each part is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, as described above, the rotation mechanism is not limited to the one that rotates the entire elbow strut including the elbow rest, but only a part of the elbow strut or only the elbow rest is rotated without rotating the elbow strut. It may be anything. An engagement member or a coil spring may be disposed on the column main body side, and an engaged portion may be provided on the cover member side. Furthermore, in the above-described embodiment, the coil spring is exemplified as the spring serving as the elastic urging means, but it is needless to say that a plate spring or the like may be used.

  In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

The external view which shows the chair which comprises the armrest which concerns on one Embodiment of this invention. The principal part external view which shows the armrest which concerns on the same embodiment. Operation | movement explanatory drawing which shows the operation | movement of the armrest. Same as above. Structure explanatory drawing which shows the armrest which concerns on the same embodiment. Sectional drawing which shows the armrest. Same as above. Operation | movement explanatory drawing which concerns on the same embodiment. Same as above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Elbow support | pillar 11 ... Support | pillar main body 12 ... Turning base end part 15 ... Cover member 16 ... Engaged part 161 ... Engagement hole 17 ... Engagement member 17a ... Engagement claw 18 ... Energizing means (coil spring)
19 ... Operation buttons 2 ... Elbow pads 2a ... Housing part C ... Office chair (chair)
E ... Armrest H ... Elevating mechanism R ... Turning mechanism SS ... Seat surface U ... Usage posture V ... Retraction posture

Claims (11)

An armrest provided on an office chair movable on the floor, and comprising at least an elbow rest for leaning an elbow of a seated person and an elbow post supporting the elbow rest,
An elevating mechanism capable of raising and lowering the elbow rest relative to the seat surface in a use posture in which the elbow rest is substantially horizontal;
A rotation mechanism that rotates all or part of the elbow strut including the elbow rest or only the elbow rest between the use posture and the retracted posture in which the elbow rest is raised. Characteristic armchair for office chair. The armrest for an office chair according to claim 1, wherein a housing portion that opens downward and accommodates an upper end portion of the elbow strut is formed inside the armrest. The armrest for an office chair according to claim 2, wherein a part of the elevating mechanism is accommodated in the accommodating portion. The rotation mechanism is configured by setting a rotation base end portion at a base end portion of an elbow strut, and the elbow post is fixed to a column main body having the rotation base end portion as a base end and the elbow rest. And a cover member that partially covers the column body and is slidable in the longitudinal direction of the column body,
The armrest according to claim 2 or 3, wherein the elevating mechanism is provided between the column main body and the cover member, and adjusts an attachment height position of the cover member with respect to the column main body. While providing either one of the column main body and the cover member with an engaged portion in which a plurality of engagement holes having different height positions are formed,
An engagement member having an engagement claw selectively engageable with the engagement hole on the other of the column main body and the cover member and a direction in which the engagement claw can engage with the engagement hole. And an urging unit that urges the engaging member toward the engagement member, and the lifting mechanism is configured to be able to release the engagement state between the engagement claw and the engagement hole by an external operation force. Item 4. The armrest according to item 4. The armrest for an office chair according to claim 4 or 5, wherein an accommodating portion that opens downward and accommodates an upper end portion of the cover member is formed inside the elbow rest. The engaging portion is provided on the column main body, and the engaging member is attached to a cover member.
The engagement member can be released from the side of the cover member below the elbow rest against the urging direction of the urging means to release the engagement between the engagement member and the engagement hole. The armchair for an office chair according to claim 6, further comprising an operation button. The armrest for office chairs of Claim 6 or 7 which has arrange | positioned the said biasing means in the upper end part of the said cover member accommodated in the said accommodating part. The biasing means is disposed at the upper end of the cover member accommodated in the accommodating portion and presses the upper end of the engagement member,
The office chair armrest according to claim 7, wherein the engagement claw is provided at a lower end portion of the engagement member, and the engagement claw is engaged with the engagement hole. The rotation base end part which has the rotation center in the said rotation mechanism is provided above the seat surface in the seat part of the said office chair, or 1, 2, 3, 4, 5, 6, 7, 8 or 9. An armchair for office chairs according to 9. The said elbow rest and the said elbow support | pillar are made to overlap | superpose with the side surface in the back part of the said office chair seeing from the side in the said retracted position, Claims 1, 2, 3, 4, 5, 6, 7, 8, 9 Or the armchair for office chairs of 10.

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