JP2005177054A - Armrest and chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an armrest having a detent mechanism and freely setting a turning range of an armrest pad without making the detent mechanism restrict the turning angle of the armrest pad relative to an elbow support. <P>SOLUTION: This armrest is provided with the armrest pad 1 for resting the elbow of a seating person, the elbow support 2 horizontally turnably supporting the armrest pad 1, and the detent mechanism formed between the armrest pad 1 and the elbow support 2 and restrictingly stopping the armrest pad 1 at a predetermined angle. The detent mechanism is provided with a stationary member 3 having a plurality of detent engagement recesses 31k around its outer circumferential face 31b and a movable member 4 turnably operated with the armrest pad 1 and having an engagement element 41k sequentially and elastically engaged with the plurality of detent engagement recesses 31k. The stationary member 3 is attached to the side of the elbow support 2 and the movable member 4 is attached to the side of the armrest pad 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an armrest in which an elbow rest is configured to be horizontally rotatable with respect to an elbow support in accordance with a use mode of a seated person, and a chair in which the armrest is attached to a predetermined position.

Conventionally, it has an elbow rest for leaning the elbow of the seated person and an elbow strut that pivotally supports the elbow rest, and the pivot point of the elbow rest and the elbow strut is centered according to the use mode of the seated person An armrest is known in which the armrest is configured to be horizontally rotatable and the longitudinal direction of the armrest can be appropriately changed (see, for example, Patent Document 1). In addition, in such an armrest that can swing horizontally with respect to the elbow support, the armrest rests moderately at a predetermined angle so that a resistance with an appropriate click feeling can be obtained when this angle is changed. For example, a cylindrical pin as an engaging member provided protruding from the upper end of the elbow strut, and an elbow rest side which is provided on the elbow rest side and moves while bringing the outer peripheral surface into contact with the pin, and It is also conceivable to provide a moderation mechanism including a movable member in which a plurality of moderation engagement recesses that can be engaged with a pin are intermittently formed on the outer peripheral surface. This movable member is provided between the pivot point and the pin on the central angle side of an arc whose radius is a line segment connecting the pivot point and the pin and extends from the pivot point along the longitudinal direction of the elbow rest. It can move forward and backward in the direction of contact and separation, and a spring that assists this forward and backward movement is provided on the pivot point side. This spring expands when the pin fits into and engages with the moderation engaging recess as the elbow rest rotates, and contracts when the pin crosses the mountain between the moderation engaging recesses, thereby moving the movable member. It is operating in a straight line.
JP-A-7-184964 (pages 1 and 2, FIG. 1)

  However, as described above, since the spring is provided on the pivot point side with respect to the pin fixed to the elbow post, the rotation angle of the elbow rest that can effectively exert the expansion / contraction function of the spring is limited. In other words, even if the pin fits into and engages with the moderation engagement recess of the movable member at a large angle with respect to the expansion / contraction direction of the spring (for example, an angle orthogonal to the expansion / contraction direction of the spring), the spring expands / contracts properly. Since this is not possible, the elbow rest cannot be rotated beyond a predetermined angular range in which this spring can properly expand and contract. This is because the moderation engagement recess is formed on the outer peripheral surface of the movable member that rotates together with the elbow pads, so that with the rotation of the elbow pads, the advancing / retreating direction of the movable member, that is, the expansion / contraction direction of the spring, This is because the direction of engagement between the pin and the moderation engagement recess of the movable member sequentially changes. On the other hand, in order to improve the stability of the pivotal support state between the elbow support and the elbow rest, it is preferable to set a large distance between the pivot point and the pin, but the side edge of the elbow rest extending in the longitudinal direction of the pin There is also a problem that the distance between the pivot point and the pin is restricted by the width of the elbow rest. Also, if the distance between the pivot point and the pin is set small without considering the stability of the pivotal support state between the elbow strut and the elbow pad, the pivot angle of the elbow pad based on the positional relationship between the pin and the pivot point Although it is conceivable to set a relatively large value, the rotation angle range of the elbow rest is substantially limited due to the restriction based on the arrangement position of the spring and the expansion / contraction direction.

  Therefore, in the conventional armrest, due to the above two problems, the rotation angle range of the armrest is limited to a very small limit.

  The present invention has been made paying attention to such problems, and the main purpose is that the angle of rotation of the elbow rest with respect to the elbow strut is limited by the moderation mechanism, while the armrest is provided with the moderation mechanism. And providing an armrest that can freely set the rotation range of the armrest.

  That is, the armrest of the present invention comprises an elbow rest for leaning the occupant's elbow and an elbow strut that pivotally supports the elbow rest, and the elbow rest includes the elbow rest and the elbow strut. An armrest provided with a moderation mechanism for stopping the elbow rest at a predetermined angle between the elbow rest and the elbow support. The mechanism includes a stationary member having a plurality of moderation engaging elements on an outer peripheral surface, and a movable member having an engaging element that rotates together with the elbow rest and can be sequentially elastically engaged with the plurality of moderation engaging elements. The stationary member is attached to the elbow strut side, and the movable member is attached to the elbow rest side.

  If this is the case, a stationary member having a plurality of moderation engagement elements formed on the outer peripheral surface is attached to the elbow strut side, and a movable member having an engagement element capable of sequentially elastically engaging with the moderation engagement elements is provided on the elbow rest side. Therefore, the direction of elastic engagement between the engagement element and the moderation engagement element of the stationary member is always constant regardless of the rotation angle of the elbow rest, and is not affected by the rotation angle of the elbow rest. The engagement state between the joint and the moderation engagement element can be always good, and the conventional problem that the rotation angle of the elbow rest is limited by providing the moderation mechanism is eliminated. The moving range can be set freely. In addition, if the outer peripheral surface of the stationary member that comes into contact with the engagement element is positioned in the vicinity of the side edge of the elbow rest, the stationary member can be maximized, and the pivot support state of the elbow strut and the elbow rest Stability can be improved. Here, the term “elastic engagement” is not limited to the elastic engagement using a spring described below, and the movable member itself is made of an elastically deformable material such as rubber, and the elasticity of the movable member itself is determined. It is a concept that also includes engagement.

  As a specific embodiment, the movable member includes the engagement element and elastic urging means that presses the engagement element to the pivot point side of the elbow rest and the elbow support.

  Further, if a rotation restricting mechanism for restricting the rotation angle of the elbow rest with respect to the elbow strut within a predetermined angle is provided, for example, the elbow rest is generally made such that the longitudinal direction thereof substantially coincides with the longitudinal direction of the chair. From the use position, it is possible to turn to a predetermined angle in accordance with the needs of the seated person, which is excellent in practicality.

  In particular, the elbow rest is provided with an accommodating portion capable of accommodating the stationary member, and the rotation restricting mechanism is provided with a protruding portion provided on one of the outer peripheral surface of the stationary member or the inner peripheral surface of the accommodating portion, and the other. If the armrest is provided with an abutting portion with which the projection abuts when the elbow rest is rotated by a predetermined angle, the projection is further abutted against the abutting portion to further rotate the armrest. Can be reliably regulated. In addition, since the stationary member is accommodated in the accommodating portion, the stationary member can be easily positioned with respect to the elbow rest, and the rotation restricting mechanism is configured by using the accommodating portion and the stationary member that are closely related to each other. Therefore, the function of regulating the rotation angle of the elbow rest can be effectively enhanced.

  The outer peripheral surface of the stationary member or the inner peripheral surface of the accommodating portion provided with a contact portion so that the protrusion and the contact portion do not interfere with each other during the rotation operation of the armrest within the predetermined angle. If a concave groove having a hollow dimension substantially corresponding to the projecting dimension of the protrusion is provided on one of the two, and both ends of the concave groove are used as the contact part, the distance between the contact parts, that is, the width of the groove Since the dimensions or the center angle of the groove is directly reflected in the rotation angle range of the elbow rest, the rotation angle range of the elbow rest can be easily determined by appropriately setting the width dimension or center angle of the groove. Can do.

  In particular, the angle formed by the line connecting each end of the concave groove and the pivot point, the angle formed by the line connecting each end of the protrusion and the pivot point, and the elbow rest If it is set to be approximately equal to the sum of the rotation angles, the elbow rest can be rotated within a predetermined angle range with little play. In addition, the angle formed by the line segment connecting each end of the groove and the pivot point, that is, the center angle of the groove can be easily set.

  In order to make the protrusions strong against the contact with the abutting part due to the pivoting movement of the elbow rest and to avoid the possibility of damage due to the contact with the contact part with a simple structure, The planar shape is preferably a substantially fan shape.

  Necessary and sufficient range for use of armrests, that is, normal use position where the longitudinal dimension of the armrest is aligned with the longitudinal direction of the chair, and rotational use where the longitudinal direction of the armrest is approximately aligned with the lateral direction of the chair In order to rotate the elbow rest between the positions and fully satisfy the user's needs, the pivot angle of the elbow rest may be set to approximately 90 degrees. Thereby, the central angle of the recess can be set relatively easily.

  On the other hand, in order to make an armrest that can be used for both left and right elbows, the rotation restriction range of the elbow rest is changed by changing the mounting direction of the stationary member to the elbow support. It is preferable that the rotation direction of the elbow rest with respect to the elbow strut can be changed. If this is the case, the armrests for the left and right elbows can be formed by a simple operation of changing the mounting direction of the stationary member, and dedicated members for the left and right elbows, respectively. Compared to the armrests that require the same, the parts can be shared, contributing to the reduction in the number of parts and the cost.

  Specifically, the stationary member is attached to the elbow strut via a fitting mechanism, and this fitting mechanism is provided on one of the lower end portion of the stationary member or the upper end portion of the elbow strut. A fitting recess and a fitting projection provided on the other and fitting into the fitting recess, and the fitting recess and the fitting projection are selected from a plurality of mounting directions of the stationary member with respect to the elbow strut What is comprised so that it may fit in the arbitrary one attachment direction to be mentioned is mentioned.

  An angle formed by a line segment parallel to one mounting direction and a line segment parallel to another mounting direction different from the one mounting direction among the plurality of mounting directions of the stationary member with respect to the elbow post. Is set so as to be substantially equal to the rotation angle of the elbow rest, by appropriately selecting one mounting direction and the other mounting direction and fitting the fitting concave portion and the fitting convex portion together. In addition to being able to change the rotation restriction range of the elbow pads, the rotation operation of the elbow pads with respect to the elbow struts in the respective fitted states can be reliably realized within a predetermined angle range.

  In addition, the fitting recesses and the fitting protrusions in a planar shape, at least the fitting recesses and the fitting protrusions are fitted in the one attachment direction, and It is preferable to set the fitting recess and the fitting protrusion to a shape that can be selected from other fitting modes formed by fitting in the other mounting direction. In this case, the fitting recess and the fitting If the planar shape of the mating convex part is a regular polygonal shape substantially corresponding to each other, the fitting concave part and the fitting convex part can be reliably fitted in any mounting direction, and a good fitting state can be obtained. Can be realized. In particular, when the rotation angle of the elbow rest is set to approximately 90 degrees, the rotation angle of the elbow rest is set by making the planar shape of the fitting concave portion and the fitting convex portion a regular square or a regular octagon. Can be suitably used as an armrest for left elbow and right elbow.

  On the other hand, in order to be able to adjust the height of the entire armrest according to the physique of the seated person, the elbow strut is fixed to the seat with the lower end fixed to the seat, and the strut body, A height adjustment mechanism that adjusts a mounting height position of the cover member with respect to the column main body between the column main body and the cover member. What is necessary is just to provide.

  As a specific embodiment of the height adjusting mechanism, it has an engaged member in which a plurality of engaging holes are formed along the height direction, and an engaging claw that can selectively engage with the engaging hole. An engagement member, and an urging means for urging the engagement member in a direction in which the engagement claw can engage with the engagement hole. What comprised the engagement state with an engagement hole so that cancellation | release is mentioned.

  Moreover, as a chair provided with an armrest that exhibits the above-described effect, it is desirable that the armrest be provided in a pair so as to be symmetrical on both left and right ends of the seat.

  As described above, according to the armrest of the present invention, the stationary member having a plurality of moderation engagement elements formed on the outer peripheral surface is attached to the elbow support side, and the plurality of moderation engagement elements are sequentially arranged on the elbow rest side. Since the movable member having the engagement element capable of elastic engagement is attached, the elastic engagement between the engagement element and the moderation engagement element of the stationary member can be performed regardless of the rotation angle of the elbow rest with respect to the elbow support. The direction is always constant, and the engagement state between the engagement element and the moderation engagement element is always good regardless of the rotation angle of the elbow pads, and the rotation range of the elbow pads can be set freely. can do.

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

  The armrest E according to the present invention is applied to a chair C as shown in FIG. 1, for example.

  First, the chair C will be briefly described. The chair C supports the seat S via a support (not shown) on a plurality of leg blades L, and a back support rod A behind the seat S. It is configured by attaching the backrest B.

  A pair of armrests E are provided at left and right end portions of the seat S so as to be symmetrical.

  As shown in FIG. 2 and the like, the armrest E includes an elbow rest 1 for leaning a seated person's elbow and an elbow strut 2 that supports the elbow rest 1 so as to be able to turn horizontally. And the moderation mechanism is provided in order to stop the moderation of the elbow rest 1 at a predetermined angle and to obtain a resistance with an appropriate click feeling when the angle is changed. As will be described later, this moderation mechanism is configured using a stationary member 3 and a movable member 4. In the following description, the front-rear direction of the elbow support 2 corresponds to the front-rear direction of the chair C. In the elbow rest 1, “rear” refers to the longitudinal direction of the elbow rest 1 as the front-rear direction of the chair C. Is the backrest B side at the normal use positions LP and RP, which are substantially matched to each other, and “front” indicates the opposite side of the backrest B side at the normal use positions LP and RP (see FIG. 1). .

  The elbow rest 1 is composed of a base portion 5 and an elbow rest cover (not shown) attached to the upper end side of the base portion 5.

  As shown in FIGS. 2 and 3, the base portion 5 mainly includes a bottom surface portion 51 having a substantially oval shape in plan view, a peripheral wall 52 provided at the periphery of the bottom surface portion 51, and the longitudinal direction of the bottom surface portion 51. A first accommodating portion 53 provided at a position slightly displaced rearward from the substantially central portion and capable of accommodating the stationary member 3, and provided continuously from the rear side of the first accommodating portion 53 to accommodate the movable member 4. It is an integrally molded product having the second housing portion 54 to be obtained.

  The 1st accommodating part 53 has the accommodation space 53S enclosed by the circular arc wall 531 of planar view substantially partial arc shape which open | released the back side. The arc wall 531 has its left and right side end portions continuous to the peripheral wall 52, and the wall thickness within a predetermined angle on the front side is thinner than its peripheral portion. Thus, by making the predetermined area of the arc wall 531 thin, a concave groove 532 is formed in the predetermined area of the inner peripheral surface of the arc wall 531. In the present embodiment, the central angle of the groove 532 is set to an angle slightly larger than 90 degrees. In addition, a through hole 53 a formed by penetrating the bottom surface portion 51 is formed at a substantially central portion of the first housing portion 53. The through hole 53a is concentric with the inner peripheral surface of the arc wall 531 excluding the portion where the concave groove 532 is formed.

  The second accommodating portion 54 includes a pair of opposing walls 541 that extend along the longitudinal direction of the elbow rest 1 continuously to the rear side of the opened arc wall 531, and a connecting wall 542 that connects the opposing walls 541 together. And has a storage space 54S having a substantially square shape in plan view with the front open. The accommodating space 54S communicates with the accommodating space 53S of the first accommodating portion 53, and the opposing walls 541 are horizontally projected from the substantially central position in the height direction toward each other. Each horizontal piece 541a is provided.

  Boss portions 511 are provided in the vicinity of both longitudinal ends of the bottom surface portion 51, and the boss portions 511, the peripheral wall 52, the arc wall 531, the opposing wall 541, and the connecting wall 542 are arranged in a substantially matrix shape. By associating with each other through the provided ribs, the strength and shape retention of the entire base portion 5 are effectively improved.

  The stationary member 3 and the movable member 4 housed in the housing parts 53 and 54 will be described later.

  On the other hand, as shown in FIGS. 2, 4, and 5, the elbow strut 2 can be inserted into and removed from a strut body 6 that is arranged in a standing posture with its lower end fixed to the seat S, and outside the strut body 6. And a cover member 7 to be fitted together.

  The column main body 6 is a pipe-shaped body having a substantially square shape in plan view, and is integrally provided with a mounting portion 61 that protrudes inwardly at a lower end portion, and the mounting portion 61 is a lower surface near the left and right side ends of the seat S. It is designed to be screwed on. Further, the cover member 7 is a pipe-like member having a similar shape slightly larger than the planar shape of the column main body 6, and a receiving portion 71 having a substantially oval shape in plan view is integrally formed at the upper end portion thereof. The inner peripheral surface is slidably fitted to the outer peripheral surface of the column main body 6. In the vicinity of both side edges of the receiving portion 71, screw portions 711 having screw holes formed on the inner surface are provided (see FIG. 2).

  A height adjusting mechanism for adjusting the mounting height position of the cover member 7 with respect to the column main body 6 is configured between the column main body 6 and the cover member 7.

  The height adjusting mechanism includes an engaged member 8 having a plurality of engaging holes 81a along the height direction, and an engaging member having an engaging claw 91 that can be selectively engaged with the engaging hole 81a. 9 and a spring 10 as a biasing means for biasing the engaging member 9 in a direction in which the engaging claw 91 can engage with the engaging hole 81a (see FIG. 4).

  The engaged member 8 is attached to the inner periphery of the column main body 6. In the present embodiment, a pair of members that can be attached to the inner periphery of the column main body 6 by holding a holding member M (described later) from the front and rear. The engaged holes 81a are intermittently formed in the engaged element 81 located on the rear side of the engaged elements 81 and 82. Each engagement hole 81a has a tapered shape that gradually becomes wider toward the inner opening edge. Further, the pair of engaged elements are fixed by appropriate means in a state where the upper and lower ends of the elements are fitted to each other.

  On the other hand, the engaging member 9 has a substantially arm shape in a side view held in a hollow holding member M provided with a fitting portion M1 capable of fitting into the receiving portion 71 of the cover member 7 at the upper end portion. , And is configured to be rotatable through a horizontal axis n provided at a predetermined height position. An engaging claw 91 having a tapered shape corresponding to the shape of the engaging hole 81a is formed at the lower end of the engaging member 9 so as to engage with the engaging hole 81a. The holding member M is positioned below the lower end. Further, a spring receiving portion 92 that can receive the spring 10 is provided on the rear edge side of the engaging member 9 and higher than the horizontal axis n, and the spring 10 is engaged with the engaging member using the spring receiving portion 92. 9 and the inner surface of the holding member M, the engagement member 9 is configured to be pressed in a direction in which the engagement claw 91 can be engaged with the engagement hole 81a due to its elasticity. And the operation part O for operating this engaging member 9 is provided in the elbow support | pillar 2. As shown in FIG. The operation portion O is configured such that a base end portion O2 is attached to the upper end portion of the engaging member 9, and the operation portion main body O1 is protruded forward through an opening window 72 formed on the front edge side of the cover member 7. From the state where the engaging claw 91 is engaged with the engaging hole 81a and the vertical movement of the cover member 7 is prohibited, the seated person holds the cover member 7 and puts his finger on the operation portion O and pushes it backward. By operating in the direction, the engagement member 9 rotates about the horizontal axis n, and the engagement state between the engagement claw 91 and the engagement hole 81a is released accordingly (in FIG. As shown, the cover member 7 is allowed to slide up and down with respect to the column main body 6 and stops the operation force on the operation portion O at a desired height position, thereby engaging the engagement hole 81a located at the height position. The claw 91 is configured to engage.

  In addition, the fitting part M1 provided in the upper end part of the said holding member M is a solid which makes a similar shape a little smaller than the planar shape of the receiving part 71 of the said cover member 7, as shown in FIG. 2, FIG. Is. Then, a substantially concave octagonal fitting recess M11 in a plan view in which a fitting protrusion 33 of a stationary member 3 described later can be fitted is formed at a substantially central portion of the fitting portion M1, and the fitting recess M11 A screw hole M12 communicating downward is formed in the central portion. Further, notches M13 are formed in the vicinity of both end portions of the holding member M, and the holding member M is inserted from above the cover member 7 so that the fitting portion M1 of the holding member M is connected to the cover member 7. The screw portion 711 of the receiving portion 71 is set to be exposed through the notch M13 when the receiving portion 71 is fitted. Further, a spacer R having a planar shape substantially the same as the planar shape of the fitting portion M1 is received on the upper surface of the fitting portion M1 with a round hole R1 formed in the spacer R in the vicinity of both end portions. The screw part 711 of the part 71 is arranged so as to coincide with each other, and the bolt B1 inserted from above into each round hole R1 is screwed into the screw hole of the screw part 711, whereby the holding member M is pulled out upward. It is prohibited. Further, a through hole Ra having substantially the same diameter as the through hole 53 a formed in the first housing part 53 of the base part 5 constituting the elbow rest 1 is formed in the substantially central part of the spacer R.

  Before attaching the elbow rest 1 and the elbow strut 2 having such a configuration, the stationary member 3 and the movable member 4 constituting the moderation mechanism are arranged in the first accommodation portion 53 and the second accommodation portion 54 of the elbow rest 1, respectively. Set up.

  As shown in FIGS. 2, 5, 6, and the like, the stationary member 3 is formed with a tapered hole 31 a in the center and is set to have a diameter slightly smaller than the diameter of the inner peripheral surface of the arc wall 531. A main body part 31 having an outer peripheral surface 31b is provided, and a protruding part 31c is provided on a part of the outer peripheral surface 31b of the main body part 31 so as to protrude outward. A plurality of moderation engagement recesses 31k, which are the moderation engagement elements of the present invention formed by recessing, are formed. The protrusion 31c has a substantially fan shape in plan view. In the present embodiment, a total of four moderation engaging recesses 31k are formed at a predetermined pitch, and the angle of a line segment connecting each center point of the moderation engagement recesses 31k located at both ends and the center point of the main body 31. Is set to be approximately 90 degrees. That is, a total of four moderation engaging recesses 31k are continuously formed in a region having a central angle of about 90 degrees. In addition, the center point of the portion where the plurality of moderation engagement recesses 31k are formed and the center point of the protrusion 31c are provided at opposite positions sandwiching the center point of the main body 31 (where the taper hole 31a is formed). Yes. In addition, the projecting dimension of the protrusion 31 c is made to substantially correspond to the recess dimension of the recessed groove 532 formed in the first accommodating part 53. Of the outer peripheral surface 31b of the main outer portion 31, the diameter of the outer peripheral surface 31b at a portion where the protrusion 31c and the moderation engagement recess 31k are not formed, and the arc wall in which both end portions are continuous with the peripheral wall 52 The diameter is set to be slightly smaller than the diameter of the inner peripheral surface of 531, the outer peripheral surface 31 b of the main body portion 31 is positioned in the vicinity of the side edge portion of the base portion 5, and the stationary member 3 is maximized. Further, on the lower surface of the main body 31, there are an insertion portion 32 that can be inserted into the through hole 53 a of the first accommodating portion 53 and the through hole Ra of the spacer R, and a fitting recess M 11 of the spacer R. A fitting projection 33 having a substantially regular octagonal shape in plan view that can be fitted is integrally formed in a step shape (see FIG. 5). A continuous opening hole 34 that opens downward and communicates with the taper hole 31a is formed at a substantially central portion of the insertion portion 32 and the fitting convex portion 33.

  As shown in FIGS. 2 and 6, the movable member 4 is a solid block-shaped movable member main body 41 in which an engagement element 41 k that can be engaged with the one moderation engagement recess 31 k is integrally provided at the front end portion. And a spring 42 as elastic biasing means for pressing the movable member main body 41 forward. The engagement element 41k has a convex shape, and its planar shape corresponds to the planar shape of the moderation engagement recess 31k. Further, a side projecting portion 411 is provided at the lower end portion of the side surface portion of the movable member main body 41 so as to project sideways.

  Next, a procedure for accommodating the stationary member 3 and the movable member 4 in the base portion 5 of the elbow rest 1 will be described. First, the spring 42 of the movable member 4 is disposed in the accommodating space 54S of the second accommodating portion 54 so that the expansion / contraction direction thereof coincides with the longitudinal direction of the base portion 5, and the movable member main body 41 is disposed in the first accommodating portion 53. The sliding movement is performed from the accommodation space 53S side toward the accommodation space 54S of the second accommodation portion 54. At this time, the side projecting portion 411 of the movable member main body 41 is slid and moved while being positioned between the bottom surface portion 51 of the base portion 5 and the horizontal piece 541 a provided on the opposing wall 541 of the second housing portion 54. Thus, the accommodating operation can be performed smoothly. Thus, the horizontal piece 541a provided on the opposing wall 541 of the second housing portion 54 functions as a guide portion that guides the sliding movement of the movable member main body 41. As a result, the spring 42 is interposed between the movable member main body 41 and the connecting wall 542 of the second housing portion 54, and the horizontal piece 541 a is a lateral protrusion 411 provided on the movable member main body 41. The movable member main body 41 is prohibited from being extracted upward. Next, the protruding portion 31 c provided on the main body portion 31 of the stationary member 3 is positioned in the concave groove 532 of the first housing portion 53, and the moderation engagement concave portion 31 k formed on the main body portion 31 of the stationary member 3 and the movable member main body 41. The stationary member 3 is accommodated in the first accommodating portion 53 so as to engage with the engaging element 41k provided in the first accommodating portion. With this housing operation, the insertion portion 32 of the stationary member 3 is inserted into the through hole 53a of the base portion 5 and the through hole Ra of the spacer R, and the fitting convex portion 33 of the stationary member 3 is moved to the elbow strut. 2 is fitted into the fitting concave portion M11 formed at the upper end portion. Thus, in the present embodiment, the fitting convex portion 33 of the stationary member 3 and the fitting concave portion M11 of the elbow post 2 have a corresponding planar shape, and the fitting concave portion M11 and the fitting convex portion 33 Is set so as to be fitted in any one attachment direction selected from a plurality of attachment directions of the stationary member 3 to the elbow support 2. The armrest E of this embodiment in which the stationary member 3 is attached to the elbow strut 2 through such a fitting mechanism having the fitting recess M11 and the fitting projection 33 is an armrest E (L for the left elbow). ) And the mounting direction of the stationary member 3 with respect to the elbow strut 2 in the armrest E (R) for the right elbow (see FIG. 1).

  First, the armrest E (L) for the left elbow will be described with reference to FIGS. In the case of the armrest E (L) for the left elbow, the armrest 1 is positioned at the normal use position LP (FIG. 6A) in which the longitudinal direction of the armrest 1 is substantially coincident with the longitudinal direction of the chair C. On the other hand, the protruding portion 31 c provided on the main body portion 31 of the stationary member 3 contacts the right end portion 532 b among the both end portions 532 a and 532 b of the concave groove 532 formed in the first housing portion 53 of the base portion 5. Or the attachment direction of the stationary member 3 is determined so that it can approach, and the fitting convex part 33 of the stationary member 3 is fitted to the fitting recessed part M11 of the elbow strut 2 in the state which maintained the attachment direction. In this fitted state, the planar shape of the fitting convex portion 33 and the fitting concave portion M11 is an octagonal shape corresponding to each other, so that the stationary member 3 and the elbow support 2 do not rotate relative to each other. The planar shape of the fitting recess M11 and the fitting protrusion 33 may be other shapes as long as it is a shape that can prohibit relative rotation and can take a plurality of fitting directions. In this embodiment in which the rotation angle of the elbow rest is set to approximately 90 degrees as will be described later, a regular square shape may be adopted as another shape. In this way, the stationary member 3 is accommodated in the first accommodating portion 53 while the mounting direction of the stationary member 3 with respect to the elbow post 2 is maintained, and the bolt B2 is inserted from above the tapered hole 31a formed in the stationary member 3. Then, the bolt B2 is inserted into the continuous opening hole 34 formed in the substantially central portion of the insertion portion 32 of the stationary member 3 and the fitting convex portion 33, and screwed into the screw portion M12 provided in the fitting concave portion M11. Thus, the stationary member 3 is fixed to the elbow support 2 via the base portion 5. Finally, an elbow rest cover is covered so as to cover the upper surface of the base portion 5, and a bolt (not shown) is inserted from below each boss portion 511 provided on the base portion 5, and this bolt is provided on the elbow rest cover. By screwing into a screw hole (not shown), the base portion 5 and the cover member 7 are integrally fastened.

  The stationary member 3 is fixed to the elbow strut 2 by the above procedure, and the movable member 4 is attached to the elbow rest 1, and the movable member 4 rotates together with the elbow rest 1 with respect to the elbow strut 2. E (L) is constructed. In this state, the spring 42 of the movable member 4 urges the engaging element 41k formed on the movable member main body 41 toward the pivot point P side of the elbow rest 1 and the elbow strut 2, and the engaging element 41k is stationary. The moderation engagement recess 31k of the member 3 is engaged.

  Thus, the armrest E (L) for the left elbow includes a normal use position LP (FIG. 6 (a)) in which the longitudinal direction of the armrest 1 is substantially coincided with the longitudinal direction of the chair C, and the normal use position. Rotation use position LQ in which the longitudinal direction of the elbow rest 1 is made to substantially coincide with the left and right direction of the chair C with the pivot point P of the elbow rest 1 and the elbow support 2 being pivoted from the LP about 90 degrees clockwise. It is set so as to be able to turn horizontally with respect to ((b) of the figure). Then, when the elbow rest 1 is rotated between the normal use position LP and the rotation use position LQ, the spring 42 extends when the engagement element 41k is fitted and engaged with the moderation engagement recess 31k, When the engaging element 41k gets over the outer peripheral surface 31b of the stationary member 3 positioned between the moderation engaging recesses 31k (apparently, a mountain positioned between the moderation engaging recesses 31k), the movable member 4 is retracted from the elbow rest 1. It is operated in a straight line along the longitudinal direction. Then, by the action of the spring 42, when the engaging element 41k is sequentially engaged while contacting or approaching the four moderation engaging recesses 31k, that is, when the angle of the elbow rest 1 with respect to the elbow support 2 is changed, Is moderately stopped at a predetermined angle so as to obtain a resistance with an appropriate click feeling, and the engaged state is stabilized. Further, when the elbow rest 1 is rotated from the normal use position LP to the rotation use position LQ, the left end portion 532a of the concave groove 532 formed in the first accommodating portion 53 in the base portion 5 of the elbow rest 1 is used. That is, the other end portion 532a different from the one end portion 531b of the concave groove 532 with which the protrusion portion 31c of the stationary member 3 abuts or is close to the normal use position LP is the protrusion portion 31c of the stationary member 3. By abutting, the further clockwise movement of the elbow rest 1 with respect to the elbow support 2 is restricted. Further, when the elbow rest 1 at the rotation use position LQ is rotated counterclockwise and returned to the normal use position LP, the right end 532b of the groove 532 is formed on the protrusion 31c of the stationary member 3. Are in contact with each other, and the elbow rest 1 is set to be prohibited from rotating further in the counterclockwise direction. As described above, both end portions 532a and 532b of the concave groove 532 function as contact portions constituting the rotation restricting mechanism of the present invention, and both end portions 532a and 532b of the concave groove 532 and the protruding portion of the stationary member 3 are provided. 31c constitutes the rotation restricting mechanism of the present invention. In this embodiment, the angle formed by the line segment connecting the end portions 532a and 532b of the concave groove 532 and the pivot point P, that is, the central angle of the concave groove 532 is pivoted with respect to each end portion of the protrusion 31c. It is set to be approximately equal to the sum of the angle formed by the line connecting the landing point P and the rotation angle of the elbow rest (approximately 90 degrees).

  On the other hand, in the case of the armrest E (R) for the right elbow, as shown in FIGS. 8 and 9, the stationary member 3 with respect to the armrest 1 positioned at the normal use position RP (FIG. 8A). The mounting direction of the stationary member 3 is determined so that the protruding portion 31c can abut or approach the left end portion 532a among the both end portions 532a and 532b of the concave groove 532 of the armrest 1 and the mounting direction is determined. The fitting convex part 33 of the stationary member 3 is fitted to the fitting concave part M11 of the elbow strut 2 in the maintained state. Since the subsequent attachment procedure is the same as the attachment procedure of the armrest E (L) for the left elbow, the description thereof is omitted. Then, the armrest E (R) for the right elbow is based on the normal use position RP (the same figure (a)) in which the longitudinal direction of the armrest 1 is substantially coincided with the longitudinal direction of the chair C and the normal use position RP. Using the pivot point P of the elbow rest 1 and the elbow support 2 as a fulcrum, it rotates approximately 90 degrees counterclockwise, and the rotation use position RQ ( (B)) is set to be able to turn horizontally. When the elbow rest 1 is rotated between the normal use position RP and the rotation use position RQ, the spring 42 extends when the engagement element 41k is fitted and engaged with the moderation engagement recess 31k, When the engaging element 41k gets over the outer peripheral surface 31b of the stationary member 3 positioned between the moderation engaging recesses 31k (apparently, the mountain positioned between the moderation engaging recesses 31k), the movable member 4 is retracted from the elbow rest 1. The point of movement in a straight line along the longitudinal direction is the same as the armrest E (L) for the left elbow, and the armrest 1 is moderately stopped at a predetermined angle to obtain a resistance with an appropriate click feeling. I am doing so. Therefore, when the elbow rest 1 is rotated from the normal use position RP to the rotation use position RQ, the right end portion of the concave groove 532 formed in the first accommodating portion 53 in the base portion 5 of the elbow rest 1. 532b, that is, the other end 532b different from the one end 532a of the concave groove 532 with which the projection 31c of the stationary member 3 is in contact with or close to the normal use position RP is the projection 31c of the stationary member 3. By further abutting on the elbow rest, further rotation of the elbow rest 1 in the counterclockwise direction with respect to the elbow post 2 is restricted. In addition, when an operation of rotating the elbow rest 1 in the rotation use position RQ clockwise to return to the normal use position RP is performed, the left end portion 532a of the groove 532 is formed in the protrusion 31c of the stationary member 3. Are in contact with each other and the elbow rest 1 is set to be prohibited from rotating further.

  In this way, the armrests E (L) and E (R) provided in a pair so as to be bilaterally symmetric at the left and right side end portions of the seat S are usually used with the armrest 1 corresponding to the use mode of the seated person. By setting the horizontal rotation between the use positions LP and RP and the rotation use positions LQ and RQ, and rotating the respective elbow pads 1 in directions close to each other, the longitudinal direction of each of the elbow pads 1 is the chair C. It is configured so that it can be used as an armrest or the like when operating a keyboard on a desk, for example. The armrest E is set so that a seated person can freely adjust the height of the elbow rest 1 by a height adjusting mechanism provided on the elbow support 2.

  As described above, in the armrest E according to the present embodiment, the moderation mechanism rotates together with the stationary member 3 having the plurality of moderation engagement recesses 31k on the outer peripheral surface 31b and the elbow rest 1, and the plurality of moderation engagement recesses 31k. And a movable member 4 having an engaging element 41k that can be sequentially elastically engaged, and the stationary member 3 is attached to the elbow post 2 side and the movable member 4 is attached to the elbow rest 1 side. Regardless of the rotation angle, the engagement direction between the engagement element 41k and the moderation engagement recess 31k of the stationary member 3 is always constant, and the engagement element 41k and the moderation engagement recess are independent of the rotation angle of the elbow rest 1. The engagement state with 31k can be always good, and the rotation range of the elbow rest 1 can be freely set. In addition, since the outer peripheral surface 31b of the main body 31 of the stationary member 3 that is in contact with or close to the engaging element 41k can be positioned in the vicinity of the peripheral edge 52 of the elbow rest 1, the stationary member 3 should be maximized. It is possible to improve the stability of the pivot state of the elbow support 2 and the elbow rest 1.

  In particular, the movable member 4 includes a movable member main body 41 provided with the engagement element 41k, and a spring 42 that presses the engagement element 41k toward the pivot point P side of the elbow rest 1 and the elbow support 2. Therefore, regardless of the rotation angle of the elbow rest 1, the pressing direction of the spring 42 and the engagement direction of the engagement element 41k and the moderation engagement recess 31k formed in the stationary member 3 can always be matched. As a result, the pressing function of the spring 42 can be always effective without being influenced by the rotation angle of the elbow rest 1.

  Further, since a rotation restricting mechanism for restricting the rotation angle of the elbow rest 1 with respect to the elbow support 2 is provided within a predetermined angle, the rotation operation of the elbow rest 1 is performed within the predetermined angle in accordance with the needs of the seated person. It can be set to be excellent in practicality.

  In addition, this rotation restricting mechanism is provided with a protrusion 31c provided on the outer peripheral surface 31b of the stationary member 3 and a concave formed on the inner peripheral surface of the arc wall 531 constituting the first accommodating portion 53 in which the stationary member 3 is accommodated. Both ends 532a and 532b of the groove 532 are configured so that the protrusion 31c abuts one end 532a (or 532b) of the groove 532 when the elbow rest 1 is rotated by a predetermined angle. Therefore, when the projection 31c comes into contact with one end 532a (or 532b) of the concave groove 532, further rotation of the armrest E can be reliably regulated. In addition, since the stationary member 3 is accommodated in the first accommodating portion 53, the stationary member 3 can be easily positioned with respect to the elbow rest 1, and the first accommodating portion 53 and the stationary member 3 that are in a close relationship with each other. Since the rotation restricting mechanism is configured using these, the function of restricting the rotation angle of the elbow rest 1 can be effectively enhanced. Furthermore, since the distance between both ends 532a and 532b of the concave groove 532, that is, the central angle of the concave groove 532 is directly reflected in the rotation angle range of the elbow rest 1, the central angle of the concave groove 532 is appropriately set. The rotation angle range of the elbow rest 1 can be easily determined as a desired angle range. Furthermore, since the planar shape of the protruding portion 31c is substantially fan-shaped, the protruding portion 31c itself is damaged by the contact of the protruding portion 31c with the end portion 532a or 532b of the recessed groove 532 accompanying the turning operation of the elbow rest 1. The fear can be effectively avoided with a simple structure.

  In addition, by changing the mounting direction of the stationary member 3 with respect to the elbow strut 2, the rotation restriction range of the elbow rest 1 can be changed, and the rotation direction of the elbow rest 1 with respect to the elbow strut 2 can be changed. In the simple operation of changing the mounting direction of the stationary member 3, the rotation directions of the armrests E (L) and E (R), in the above embodiment, from the normal use positions LP and RP to the rotation use positions LQ and RQ Compared with the armrests that require dedicated members for the left and right elbows, both the left and right elbow armrests E can be used with the same parts. This contributes to a reduction in the number of parts and cost.

  In this case, a fitting mechanism is constituted by the fitting convex portion 33 provided at the lower end portion of the stationary member 3 and the fitting concave portion M11 formed at the upper end portion of the elbow post 2, and the fitting concave portion M11 and the fitting convex portion are formed. The portion 33 is configured to fit in any one mounting direction selected from a plurality of mounting directions of the stationary member 3 with respect to the elbow strut 2, and the planar shape of the fitting convex portion 33 and the fitting concave portion M11 Since these are regular octagonal shapes substantially corresponding to each other, the fitting convex portion 33 and the fitting concave portion M11 can be reliably fitted in a tight state in any mounting direction, and the fitting state is good. While being able to be taken, it can prevent that the fitting convex part 33 and the fitting recessed part M11 rotate relatively, and can prevent reliably that the attachment direction with respect to the elbow support | pillar 2 of the stationary member 3 shifts | deviates. . Particularly, since the planar shape of the fitting convex portion 33 and the fitting concave portion M11 is a regular octagon, the armrest E for the left elbow and the right elbow with the rotation angle of about 90 degrees of the elbow rest 1 secured (L ), E (R), and can be suitably used, and has excellent practicality. When the rotation angle of the elbow rest 1 is set to approximately 90 degrees, the same effect as described above can be obtained even when the planar shape of the fitting convex portion 33 and the fitting concave portion M11 is set to a regular square. Can do.

  Further, the elbow strut 2 includes a strut body 6 that is arranged in a standing posture with its lower end fixed to the seat S, and a cover member 7 that is detachably fitted to the outside of the strut body 6. Since a height adjusting mechanism for adjusting the mounting height position of the cover member 7 with respect to the column main body 6 is provided between the main body 6 and the cover member 7, the armrest E as a whole is adjusted according to the physique and usage of the seated person. The height can be adjusted, making it easy to use.

  In particular, the height adjustment mechanism includes an engaged member 8 in which a plurality of engagement holes 81a are formed along the height direction, and an engagement claw 91 that can selectively engage with the engagement holes 81a. The member 9 and the spring 10 as a biasing means for biasing the engaging member 9 in a direction in which the engaging claw 91 can engage with the engaging hole 81a are provided. Since the engagement state between the engagement claw 91 and the engagement hole 81a can be released by applying a predetermined operation force against the operation, the operation is simple while adopting a simple configuration. Is preferred.

  The present invention is not limited to the embodiment described in detail above.

  For example, as a moderation engagement element formed on the stationary member, a moderation engagement convex portion having a convex shape may be employed instead of the moderation engagement concave portion having a concave shape. In this case, the shape of the engagement element may be a concave shape corresponding to the shape of the moderation engagement protrusion.

  In the above embodiment, the movable member is composed of a movable member main body having an engagement element and a spring which is an elastic biasing means, but the movable member is composed of a single material that can be elastically deformed such as rubber, You may make it engage an engaging element and the said moderation engagement element using the elasticity of this movable member itself. Further, for example, a movable member such as a ball, or the like, in which the movable member itself functions as an engagement element may be used. In the embodiment, the coil spring is exemplified as the spring as the elastic urging means. However, a leaf spring or the like may be used.

  Further, the rotation restricting mechanism is not limited to that of the above-described embodiment, and for example, the protrusion may be provided on the inner peripheral surface of the accommodating portion that accommodates the stationary member, and the contact portion may be provided on the outer peripheral surface of the stationary member. Absent. In this case, if the concave groove is formed on the outer peripheral surface of the stationary member, both end portions of the concave groove can function as the contact portion. Moreover, what is necessary is just to set the center angle of a ditch | groove to the said arbitrary angle, when setting the rotation angle with respect to the elbow support | pillar of an elbow pad to an arbitrary angle. Further, the elbow rest may be set so as to be able to turn 360 degrees horizontally with respect to the elbow strut without providing the rotation restricting mechanism. In this case, the moderation engagement element may be formed continuously or intermittently over the entire region of the outer peripheral surface of the stationary member.

  Moreover, even if it is a case where the fitting recessed part which comprises a fitting mechanism is provided in the lower end part of a stationary member, and a fitting convex part is provided in the upper end part of an elbow support | pillar, there exists an effect similar to the above. In addition, the planar shape of the fitting recess and the fitting protrusion is preferably a regular polygonal shape corresponding to each other. However, as long as at least two or more fitting combinations are possible, a diamond shape or an ellipse shape is possible. For example, it may be set to an irregular shape. In this case, the fitting concave portion and the fitting convex portion are planarly shaped, and at least one fitting concave portion and the fitting convex portion are fitted in one attachment direction, and the fitting concave portion It is more desirable that the fitting convex portion is set in a selectable shape with another fitting mode in which the fitting convex portion is fitted in the other mounting direction.

  Further, as shown in FIG. 10, the elbow strut X2 has a lower end fixed to the seat and is disposed in a standing posture, and a cover member X7 that is detachably fitted to the outside of the strut body X6. A plurality of engagement holes X61 are formed in the upper end portion of the column main body X6 along the height direction, and an engagement claw X91 that can be engaged with the engagement hole X61 is provided at the lower end portion. In addition, an engagement member X9 having an arm shape in a side view that is set to be rotatable through a horizontal axis Xn held by the shaft holding portion X71 is provided and held by a spring holding portion X72 provided on the inner peripheral surface of the cover member X7. The engagement member X9 may be configured to be pressed in the direction in which the engagement claw X91 is engaged with the engagement hole X61 by the elasticity of the spring X10. And the operation part XO for operating this engagement member X9 is provided in the elbow post X2 in a state where the operation part body XO1 is exposed through the opening window X73 formed on the front edge side of the cover member X7, The operation member XO having the base end portion XO2 attached to the upper end portion of the engagement member X9 is moved from the state in which the engagement claw X91 is engaged with the engagement hole X61 and the vertical movement of the cover member X7 is prohibited. By engaging the operation portion XO with a finger and turning it upward, the engagement member X9 rotates about the horizontal axis Xn, and accordingly, the engagement claw X91 and the engagement hole X61 are engaged. The combined state is released (indicated by an imaginary line in the figure), and the vertical sliding movement of the cover member X7 with respect to the column main body X6 is allowed. By stopping the operation force with respect to the operation unit O at a desired height position, Engagement hole 81 located at the height position Engaging claws 91 may be used height adjustment mechanism which is configured to engage the. If it is such, compared with the thing of the said embodiment, reduction of a number of parts can be aimed at.

  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 whole top view which shows the armrest which concerns on one Embodiment of this invention, and the chair which applied this armrest. The principal part disassembled perspective view which abbreviate | omits and shows a part of armrest which concerns on the same embodiment. The top view of the base part which comprises the armrest of the armrest which concerns on the embodiment. The sectional side view which abbreviate | omits and shows a part of elbow support | pillar of the armrest which concerns on the same embodiment. The perspective view which abbreviate | omits and shows the upper end part of the stationary member and elbow support | pillar in the same embodiment. Action explanatory drawing of the armrest for left elbows concerning the embodiment. The action explanatory view of the armrest for the left elbow. Action explanatory drawing of the armrest for right elbows concerning the embodiment. The operation explanatory view of the armrest for the right elbow. The sectional side view which shows the modification of the elbow support | pillar and height adjustment mechanism in the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Elbow pad 2 ... Elbow support | pillar 3 ... Stationary member 31c ... Projection part 31k ... Moderation engagement element (moderation engagement recessed part)
33 ... fitting convex part 4 ... movable member 41k ... engagement element 42 ... elastic biasing means (spring)
53. Storage unit (first storage unit)
532 ... concave groove 6 ... column body 7 ... cover member 8 ... engaged member 81a ... engaging hole 9 ... engaging member 91 ... engaging claw 10 ... biasing means (spring)
C ... Chair E ... Armrest M11 ... Fitting recess S ... Seat

Claims (17)

An elbow rest for leaning the elbow of the seated person and an elbow strut that pivotally supports the elbow rest, the elbow rest being horizontal with the pivot point of the elbow rest and the elbow strut as a fulcrum An armrest provided with a moderation mechanism for moderatingly stopping the elbow rest at a predetermined angle between the elbow rest and the elbow strut while being configured to be capable of turning.
The moderation mechanism includes: a stationary member having a plurality of moderation engaging elements on an outer peripheral surface; and a movable member having an engaging member that rotates together with the elbow rest and is capable of sequentially elastically engaging the plurality of moderation engaging elements. It is equipped with
The armrest is characterized in that the stationary member is attached to the elbow strut side and the movable member is attached to the elbow rest side. The armrest according to claim 1, wherein the movable member includes the engagement element and elastic urging means that presses the engagement element toward the pivot point. The armrest according to claim 1 or 2, further comprising a rotation restricting mechanism for restricting a rotation angle of the elbow rest with respect to the elbow strut within a predetermined angle. The elbow rest is provided with an accommodating portion that can accommodate the stationary member,
The rotation restricting mechanism is in contact with a protrusion provided on one of the outer peripheral surface of the stationary member or the inner peripheral surface of the housing portion and the protrusion provided when the elbow rest is rotated a predetermined angle. The armrest according to claim 3, further comprising a contact portion. The outer peripheral surface of the stationary member or the inner peripheral surface of the accommodating portion provided with a contact portion so that the protrusion and the contact portion do not interfere with each other during the rotation operation of the armrest within the predetermined angle. The armrest according to claim 4, wherein a concave groove having a hollow dimension substantially corresponding to a protruding dimension of the protruding portion is provided on one of the two, and both end portions of the concave groove are used as the contact portions. The angle formed by the line connecting each end of the concave groove and the pivot point, the angle formed by the line connecting each end of the protrusion and the pivot point, and the rotation of the elbow rest The armrest according to claim 5, wherein the armrest is set to be approximately equal to the sum of the angle. The armrest according to claim 5 or 6, wherein the planar shape of the protrusion is substantially fan-shaped. The armrest according to claim 3, 4, 5, 6, or 7, wherein the pivot angle of the elbow rest is approximately 90 degrees. 4. The rotation restriction range of the elbow rest is changed by changing the mounting direction of the stationary member with respect to the elbow strut, and the rotation direction of the elbow rest with respect to the elbow strut can be changed. The armrest according to 4, 5, 6, 7 or 8. The stationary member is attached to the elbow post via a fitting mechanism, and the fitting mechanism includes a fitting recess provided on one of a lower end portion of the stationary member or an upper end portion of the elbow post, and the other A fitting protrusion that is fitted to the fitting recess, and the fitting recess and the fitting protrusion are any one selected from a plurality of mounting directions of the stationary member with respect to the elbow strut. The armrest according to claim 9, which is fitted in the attaching direction. Of the plurality of mounting directions of the stationary member with respect to the elbow strut, an angle formed by a line segment along one mounting direction and a line segment along another mounting direction different from the one mounting direction, The armrest according to claim 10, wherein the armrest is set to be substantially equal to a rotation angle of the armrest. The fitting concave portion and the fitting convex portion have a planar shape, and at least the fitting concave portion and the fitting convex portion are fitted in the one attachment direction, and the fitting concave portion The armrest according to claim 11, wherein the fitting projection and the fitting convex portion are set in a shape that can be selected from other fitting modes. The armrest according to claim 10, 11, or 12, wherein a planar shape of the fitting concave portion and the fitting convex portion is a regular polygon shape substantially corresponding to each other. The armrest according to claim 13, wherein the regular polygonal shape is a regular tetragon or a regular octagon. The elbow strut includes a strut body that is arranged in a standing posture with a lower end fixed to a seat, and a cover member that is detachably fitted to the outside of the strut body, and the strut body and the cover A height adjusting mechanism for adjusting a mounting height position of the cover member with respect to the column main body is provided between the members and the member. , 11, 12, 13 or 14. The height adjusting mechanism includes an engaged member having a plurality of engaging holes formed along a height direction, an engaging member having an engaging claw selectively engageable with the engaging hole, And a biasing means for biasing the engagement member in a direction in which the engagement claw can engage with the engagement hole. The engagement claw and the engagement hole are engaged with each other by a predetermined operation force. The armrest according to claim 15, wherein the armrest is configured to be able to be released. A chair provided with a pair of armrests according to claim 1 so as to be symmetrical on left and right side ends of the seat.

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