JP2013000274A - Armrest device for chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an armrest device for chair which looks good and has an excellent function for preventing an elbow pad cover from turning up and an elbow supporting portion with a large strength.SOLUTION: An elbow pad body 3 is a molded product of aluminum die casting or the like and has an elbow supporting portion 5 which is long from front to back. A plastic elbow pad cover 4 is fastened to the elbow supporting portion 5. While the elbow supporting portion 5 has an upper surface 11, an internal surface 9, and a slanted lateral surface 10, the elbow pad cover 4 has an upper plate 13 and a side plate 14. The elbow pad cover 4 has positioning boss bodies 17 which downwardly protrude and are fitted into positioning holes 18 of the elbow supporting portion 5. Because the positioning boss bodies 17 serve as a resistance to the turning up of the elbow pat cover 4, the turning up prevention function becomes more effective. The boundary between an exposed surface of the elbow supporting portion 5 and the elbow pad cover 4 sharply appears, so the armrest device looks good.

Description

  The present invention relates to an armrest device for a chair, and is particularly suitable for a fixed armrest device that is not movable. The chair of the present invention includes a bench and a sofa. A vehicle seat is also included.

  As an aspect of the armrest device of the chair, there is one in which an elbow rest cover (elbow rest pad) is attached to the elbow rest main body. The reason why the elbow rest main body and the elbow rest cover are separated in this way is mainly to maintain the strength of the elbow rest main body while maintaining the softness of the elbow rest cover. That is, the function as an armrest device is shared by a plurality of members. The elbow cover may be made of a simple resin or may be provided with a cushion material such as an elastomer on the outer surface. The cushion material may be formed integrally with the elbow cover, or may be used by cutting a sheet-like material, and in any case, the cushion material is often covered with a skin material such as cloth or leather.

  As conventional techniques of this type of armrest device, Patent Documents 1 and 2 disclose examples applied to so-called pipe chairs. In these Patent Documents 1 and 2, the front end portion of the elbow rest cover is bent downward, and a screw inserted from below into the elbow rest main body is screwed into the elbow rest cover. Patent Documents 3 and 4 also disclose an elbow rest cover whose tip is bent downward. In these two publications, a rearward positioning projection is provided on the lower front portion of the elbow rest cover, and this positioning projection is applied to the elbow rest. It fits into the hole provided in the main body, and the rear part of the elbow rest cover is fixed to the elbow rest main body with screws.

  Moreover, in patent document 5, while the elbow rest main body is a form (horizontally long L shape) which has an upward wall at the outer end close to a flat shape in a front sectional view, the elbow rest cover includes an upper plate and its inner part. It has an inverted L shape having a side plate portion extending downward from the end, and a hollow structure is formed by the elbow rest main body and the elbow rest cover. As a cross-sectional shape of an elbow rest main body that does not include an elbow rest cover, Patent Document 6 discloses an inverted triangular shape, and Patent Document 7 discloses an inverted convex shape in which inner and outer side surfaces are concave curved surfaces. Has been.

CD-ROM of Japanese Utility Model Publication No. 5-74347 Japanese Patent Laid-Open No. 11-56524 Actually open 7-7550 CD-ROM JP 2003-159151 A CD-ROM of Utility Model 5-1359 Design Registration No. 1121813 Design Registration No. 1115849

  Now, a person who sits down may grab the armrest device, and an external force acting on the outer or inner part of the elbow pad cover acts by placing a finger on the inner or outer part of the elbow pad cover. There is. For example, in the case of Patent Document 5, the outer end surface of the upper plate in the elbow pad cover is exposed, and the elbow pad cover is difficult to say that the elbow pad cover is firmly overlapped with the main body of the elbow pad. If not taken, it is presumed that the outer end portion of the elbow rest cover is likely to bend upward.

  For this point, it is conceivable that the elbow rest cover is formed in a U-shaped cross section as in Patent Documents 1 and 2, and the elbow rest main body is completely covered with the elbow rest cover. Since the elbow rest main body is too hidden, for example, there is a problem that it is difficult to meet a design request to expose the outer surface of the elbow rest main body and to show the boundary between the elbow rest cover sharply.

  In addition, when a sheet-like cushion material is placed over the elbow rest cover and covered with a skin material, the cushion material is crushed at the outer periphery of the elbow rest cover, but unevenness occurs in the way of crushed and the skin material is uneven. May occur, which may impair the aesthetics.

  For example, the armrest device of Patent Document 3 has an advantage that the elbow rest cover can be firmly fixed to the elbow rest body with one screw because the positioning projection is provided at the rear end or the front portion of the elbow rest cover. On the other hand, there is a type in which the front end or the rear end of the elbow rest main body is a free end as in Patent Document 6, and in this case, the elbow rest cover is positioned at a portion of the elbow rest main body opposite to the free end, By slightly deforming the elbow rest cover against its elasticity, the end of the elbow rest cover is overlaid on the free end of the elbow rest body, and the elbow rest cover is screwed to the part near the free end of the elbow rest body. Although it can be fastened with a single screw, it can be said that the stability of the elbow rest cover can be improved and the beauty can be improved. However, if the elbow rest cover is made strong so that the elbow rest cover is difficult to bend, it becomes difficult to place the end of the elbow rest cover on the free end of the elbow rest body, which makes it difficult to install or remove the elbow rest cover. there is a possibility.

  The present invention has been made to improve the current situation.

  The present invention relates to an armrest device on which a seated person can put an elbow, and includes the structure of each claim. Of these, the invention of claim 1 has an elbow rest main body having an elbow support portion that is long in the front-rear direction, and a resin elbow rest cover attached to the elbow rest main body. The inner surface near the seat is basically in a substantially vertical state, and the outer surface on the opposite side of the seat is inclined or curved so as to approach the inner surface as it goes down. It has an upper plate that overlaps the upper surface of the elbow rest main body and a side plate that overlaps the inner surface of the elbow rest main body, and has an inverted L-shaped cross section.

  According to a second aspect of the present invention, in the first aspect, a plurality of positioning boss bodies projecting downward are protruded from the lower surface of the upper plate of the elbow rest cover in a state of being spaced apart in the front-rear direction. The elbow support portion of the elbow pad main body is provided with a positioning hole into which the positioning boss body of the elbow pad cover is fitted so as not to move left and right. According to a third aspect of the present invention, in the first aspect, the elbow rest main body is an aluminum or light alloy molded product.

  According to a fourth aspect of the present invention, in the second or third aspect of the invention, in the lower surface of the upper plate of the elbow rest cover, downward ribs are provided on both sides or one side of the positioning boss body so as to contact the elbow rest main body. Or, an upper rib is provided on both sides or one side of the upper surface of the elbow pad main body so as to sandwich the positioning boss body, and this is brought into contact with the elbow pad cover from below, or the upper plate in the elbow pad cover Ribs that abut each other on both sides or one side of the positioning boss body are provided on the lower surface of the arm and the upper surface of the elbow rest main body.

  According to a fifth aspect of the present invention, in any one of the second to fourth aspects, at one end of the front and rear end portions of the upper plate of the elbow rest cover, an end engaging claw having a side-view hook shape projects downward. On the other hand, a claw receiving hole in which the end engagement claw is hooked and engaged with one end portion of the elbow support portion in the elbow support body by overlapping the elbow support cover and then moving it toward the other end portion. Side engaging means for making it difficult for the side plate of the elbow pad cover to move upward is formed on the side plate of the elbow pad cover and the inner side surface of the elbow support portion. When the elbow rest cover is pushed downward with the joint pawl engaged with the pawl receiving hole, the engagement means provided on the side plate of the elbow rest cover and the inner side surface of the elbow support portion are set to engage with each other. Of the elbow rest cover. The end portion of the engaging claw opposite, bis inserted from below the elbow body is screwed.

  The invention of claim 6 is the invention according to claim 5, wherein the other end of the elbow rest cover opposite to the end engaging claw is fitted tightly to the other end of the elbow rest main body, A bent portion is formed at the other end portion and at a position shifted to one end side with the screw interposed therebetween so that the other end portion of the elbow rest cover can be easily raised upward. When removing from the main body, it is set so that the entire elbow rest cover can be easily slid in the direction of the end engagement claw if the other end is lifted after releasing the fastening with the screw, and the positioning The hole is a long hole to allow the positioning boss to slide in the front-rear direction.

  In the present invention, the elbow rest cover has an upper plate and a side plate and is L-shaped. Since the side plate overlaps the inner surface of the elbow rest main body, the elbow rest cover is placed from the inside (the side of the seat). From the external force to be raised, the side plate becomes resistant and exerts strong strength, and when an external force that raises the outer edge of the upper plate acts on the elbow rest cover, the side plate will become the elbow rest body. The elbow rest cover is difficult to be deformed by being pressed against the inner surface (by stretching), and therefore has a high anti-turning function.

  In addition, since the outer surface of the elbow rest main body is inclined or curved, the normal cross-sectional shape of the elbow rest main body is a shape close to a right triangle, and therefore has a high section modulus with respect to the load from above. Therefore, high strength can be ensured without excessively increasing the wall thickness (in other words, while saving as much material as possible).

  In addition, since the outer surface of the elbow rest body is exposed, people can clearly see the boundary with the elbow rest cover, and the elbow rest cover does not look thick when looking at the armrest device from the outside of the seat, For this reason, it is in a neat state in terms of design. Further, since the outer surface of the elbow rest body is inclined or curved, the elbow support portion looks like a thin line when a person is looking down from the outside of the seat. Although it is an armrest device that softens the contact of a person who is seated by being covered with a cover, the elbow support portion of the armrest device does not look thick and exhibits a sharp appearance as a whole. This is also an advantage of the present invention.

  Furthermore, since the inner side surface of the elbow support part in the elbow support body is covered with the side plate of the elbow support cover, even if a recess for weight reduction etc. is opened on the inner side surface of the elbow support part, It is hidden by the side plate of the cover and cannot be seen. For this reason, the recessed part and hole for weight reduction etc. can be formed, without impairing aesthetics.

  If the structure of Claim 2 is employ | adopted, even if the external force which tries to raise from an outer side or an inner side acts on an elbow pad cover, the positioning boss body and the positioning hole fit together, and the upper part of the elbow pad cover Since the deformation of the plate is prevented, the function of preventing the drooping is further enhanced.

  The material of the elbow rest main body can be made of resin or steel, but if a molded product of aluminum or light metal is used as in claim 3, the appearance effect can be improved by exerting an accent effect by white or silver metal color. . In this case, when the elbow rest main body is mirror finished with a buff or the like, the appearance can be further improved. However, since the upper and side plates of the elbow support portion of the elbow rest main body are covered with the elbow rest cover, it must be mirror finished. There is an advantage that the cost can be reduced by reducing the area as much as possible.

  If the structure of Claim 4 is employ | adopted, since it will be blocked by a rib striking when it tries to roll an elbow pad cover upward, there exists an advantage which can prevent a wrinkle more accurately, without making an elbow pad cover too thick. .

  If the structure of Claim 5 is employ | adopted, since the other end of an elbow pad cover has overlapped with the other end surface of an elbow support part in the state in which the end engagement nail was hooked on the nail | claw receiving part, an elbow pad cover cannot be moved back and forth firmly. It is held. Moreover, since the other end surface of an elbow support part is not exposed, it is excellent also in aesthetics. Furthermore, since the nail receiving hole of the elbow support elbow support portion opens upward, one end portion of the elbow support cover does not need to be bent greatly downward. Therefore, the application range is wide and the versatility is excellent.

  Further, since the side plate of the elbow rest cover is held in a state in which it is difficult to move upward by the side engaging means, the strength against an external force that raises the elbow rest cover from the inside is remarkably increased. Further, the elbow pad cover is attached to the elbow pad main body by a simple operation of inserting the end engaging claw into the claw receiving hole of the elbow support part and then pressing it downward to fix the screw. For this reason, the workability of attachment is good.

  In the case of the fifth aspect, the other end of the elbow pad cover is fitted into the other end surface of the elbow support part by pushing against the elasticity. It cannot be said that there is no possibility that the engaging claws will be damaged. In this respect, when configured as in the sixth aspect, the elbow rest cover is lifted upward after releasing the fastening with the screw, so that the entire elbow rest cover is slid to the one end side. Can be removed.

(A) is the right view of a chair, (B) is the side view which looked at the armrest apparatus for left arms from the inner upper direction. (A) is an exploded perspective view, (B) is a perspective view of the front end portion of the elbow support portion, (C) is a perspective view of the elbow rest body viewed from the inside, and (D) is a side view of the elbow rest body. The front cross-sectional view of the armrest device, (A) is a cross-sectional view of the armrest device viewed from the IIIA-IIIA viewing direction of FIG. 2 (C) (the elbow rest cover is shifted forward), (B) is the armrest 2C is a cross-sectional view of the device viewed from the IIIB-IIIB viewing direction of FIG. 2C, and FIG. 3C is a cross-sectional view of the armrest device viewed from the IIIC-IIIC viewing direction of FIG. It is a longitudinal cross-sectional side view. (A) is the isolation | separation perspective view which looked at the elbow support part from the downward direction, (B) is the front sectional view of the location of a side engagement claw.

  Next, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1A, the armrest device 1 of this embodiment is applied to a rotary chair for office use or the like, and is attached to a base 2. Of course, there is no limitation on where the armrest device 1 is attached, and it can be attached to a seat, attached to a tilting frame to which the backrest is attached, or attached to the backrest. In the case of a chair such as a bench that has a seat and a backrest fixed to the support frame material, the armrest device will be attached to the support frame material.

  The armrest device 1 has an elbow rest main body 3 fixed to the base 2 and an elbow rest cover 4 fixed to the upper surface of the elbow rest main body 3. The elbow rest main body 3 has an elbow support portion 5 that is long in the front and rear and a support column 6 that extends downward from its front end (one end), and the lower end of the support column 6 is formed as an inward portion 6 a that extends below the seat 7. The tip of the inward portion 6 a is fixed to the base 2 with screws (bolts) 8. The elbow rest body 3 is an aluminum die-cast product, and the part touching the human eye is mirror-finished with a buff or the like.

  The rear end (other end) of the elbow support 5 in the elbow rest body 2 is a free end. Further, as can be clearly understood from FIG. 4, the upper surface of the elbow support 5 is gently curved upward and convex in a side view, and the elbow support 5 is slightly narrowed toward the tip in a plan view. ing. Further, as shown in the respective drawings of FIG. 3, the elbow support portion 5 has an inner surface 9 facing the seat 7 that is basically in a vertical posture although a hole is formed. On the other hand, the outer surface 10 of the elbow support 5 is inclined so as to approach the inner surface 9 as it goes down. The upper surface 11 of the elbow support 5 is basically in the form of a flat surface. Therefore, the front cross-sectional shape of the elbow support 5 is a shape close to a right triangle.

  The degree of inclination of the outer surface 10 in the elbow support 5 is an angle smaller than 30 degrees with respect to the horizontal. In addition, the ratio of the horizontal width dimension of the upper surface 11 to the vertical height dimension of the inner surface 9 is approximately double (the elbow support portion 5 is tapered in a side view, so the height of the inner surface 9 is The ratio of the width dimension of the upper surface 11 to the diameter gradually decreases from the base portion with the support column 6 toward the front end (rear end). In addition, since the support | pillar 6 is in the state which bent the elbow support part 5, the planar cross-sectional shape of the support | pillar 6 is also a shape close | similar to a right-angled triangle.

  The elbow rest cover 4 is a molded product made of resin such as PP, and has an upper plate 13 that overlaps the upper surface 11 of the elbow support portion 5 and a side plate 14 that overlaps the inner side surface 9 of the elbow support portion 5. Inverted L shape. As clearly shown in FIG. 4, the front end portion of the upper plate 13 is a front engaging portion 13a that overlaps the curved surface of the front end of the elbow support portion, and the front end portion of the upper plate 13 is the front end surface (the other end surface of the elbow support portion). ) Is a rear engagement portion 13b that overlaps with the rear engagement portion 13b.

  As shown in FIGS. 2 and 3, an upward rib 15 having a rectangular shape in plan view is formed on a portion of the upper surface 11 of the elbow support portion 5 excluding a slight range near the front end. Downward ribs 16 are formed on the lower surface of the plate 13 so as to contact the upward ribs 15 from above. The outer edge 13 c of the upper plate 13 in the elbow pad 4 is in contact with the outer edge of the upper surface 11 of the elbow support 5.

  That is, by curling the outer edge 13c of the upper plate 13 downward in the elbow pad cover 4, a gap (space) is left between the upper plate 13 and the elbow support portion 5, but the upper and lower ribs 15 , 16 and abut against each other, the elbow rest cover 4 is stably supported by the elbow support portion 5. Although the thickness of the upward rib 15 is set to be smaller than the thickness of the downward rib 16, it can be set to the same level or in the reverse relationship. The ribs 15 and 16 can also be formed in a jumping state.

  The rib 16 of the elbow rest cover 4 also has a reinforcing effect that makes the elbow rest cover 4 difficult to bend and deform. About the point of this reinforcement effect, it is still more suitable if it forms in loop shape of planar view square shape like this embodiment.

  Cylindrical positioning boss bodies 17 project downward from two portions of the upper plate 13 of the elbow rest cover 4 across the front and rear intermediate portions, while the upper surface 11 of the elbow support portion 5 A positioning hole 18 is formed in which the positioning boss body 17 of the abutting cover 5 is fitted so as not to be laterally displaced. The positioning hole 18 is a long hole extending in the front-rear direction, and the positioning boss body 17 is located at the rear end of the positioning hole 18 in a state where the elbow rest cover 4 is mounted. The positioning boss body 17 is provided at a position that roughly divides the elbow rest cover 4 into three equal parts.

  A side-view-type end engaging claw 19 having a forward claw 19a at the lower end portion projects downward from a portion of the upper plate 13 of the elbow pad cover 4 closer to the front end. On the other hand, a claw receiving hole 20 into which the end engagement claw 19 is fitted is opened upward in the elbow support portion 5 of the elbow pad main body 3, and the forward claw 19 a of the end engagement claw 19 is inserted into the claw receiving hole 20. Is provided with a claw receiving portion 20a that is hooked from below. The claw receiving hole 20 is a long hole that is long in the front and rear directions. For this reason, the protrusion length of the forward claw 19a is increased without impairing the ease of inserting and removing the end engaging claw 19 into and from the claw receiving hole 20. The nail holder 20a can be hooked firmly.

  When the elbow rest main body 4 is manufactured by die casting, a main mold that moves in the vertical direction is used based on the posture attached to the chair. However, the claw receiving hole 20 having the claw receiving portion 20a cannot be processed (ie, die cutting cannot be performed) with only the main mold that is in close contact with and separated from the vertical direction. Therefore, a slide type that moves in the left-right direction is used to form the claw receiving part 20a. By using this slide type, the nail receiving part 20a has a claw receiving part 20a in the claw receiving hole 20. An auxiliary lateral hole 21 communicating with a lower part and opening in the inner side surface 9 is formed. The auxiliary side hole 21 also plays a role of weight reduction.

  A cylindrical fastening boss body 22 projects downward from the rear end of the upper plate 13 of the elbow pad cover 4, while a fastening boss body 22 is formed on the elbow support section 5 of the elbow pad body 3. An upper front recess 23 to be fitted is provided, and a screw hole 24 having an upper and lower opening is provided in a portion where the upper front recess 23 is provided, and a screw 25 inserted through the screw hole 24 is screwed into the fastening boss body 22. .

  The front engaging portion 13b of the upper plate 13 of the elbow rest cover 4 fits tightly on the rear end of the elbow support portion 5 by deformation against elasticity while the engaging claw 19 is in contact with the claw receiving portion 20a. In this state, the screw 25 is screwed into the fastening boss body 22. For this reason, the elbow pad cover 4 is held so as not to move back and forth. The upper front recess 23 is a long hole that is long in the front-rear direction with a groove width in which the fastening boss body 22 is fitted. In addition, the rear half of the upper front recess 23 has an inclined surface 23a whose depth decreases toward the rear. A lower front recess 23 ′ for concealing the head of the screw 25 is formed in a portion around the screw hole 23 on the lower surface of the front portion of the elbow support portion 5.

  As shown in FIG. 2 (A), of the lower surface of the upper plate 13 in the elbow rest cover 4, the portion between the front and rear positioning boss bodies 17, and the position between the front positioning boss body 17 and the end engagement claw 19. A cylindrical portion 26 protrudes downward from the site. On the other hand, a round hole 27 facing the cylindrical portion 26 is provided on the upper surface 11 of the elbow support portion 5. There is a gap (gap) between the cylindrical portion 26 and the elbow support portion 5.

  As shown in FIGS. 2A and 4, in the elbow rest cover 4, the rear portion of the elbow rest cover 4 is raised at a portion between the fastening boss body 22 and the rear positioning boss body 17. As an example of a means for forming the bent portion, a slit 28 opened up and down is formed. To be precise, the elbow rest cover 4 is connected on both the left and right sides of the slit 28, and the connected portion is bent. In any case, the portion of the slit 28 may be called a bent portion.

  As shown in FIGS. 2 (A) and 5 (B), side engaging claws 29 protruding toward the elbow support portion 5 are provided on the side plate 15 of the elbow rest cover 4 corresponding to the positioning boss body 17. On the other hand, the inner side surface 9 of the elbow support 5 is provided with a stealing hole (engagement hole) 30 into which the side engagement claw 29 is fitted. The side engaging claw 29 is hooked on the upper end of the stealing hole 30. The side engaging claws 29 and the stealing hole 30 constitute engaging means described in claims. The stealing hole 30 also functions to reduce weight and equalize the wall thickness.

  A shallow guide groove 34 that causes the side engagement claw 29 to be raised and deformed when the side engagement claw 29 is slid forward is formed at a portion located immediately in front of the side engagement claw 29 with the elbow cover 4 attached. The portion connected to the guide groove 34 in the inner side surface of the stealing hole 30 is an inclined surface 30a in plan view. The upper end portion of the guide groove 34 is an inclined guide surface 34a for smoothly moving the side engagement claw 29 upward.

  The upper plate 13 and the side plate 14 of the elbow rest cover 4 are overlapped with a cushion material 31 from the outside, and the cushion material 31 is covered with a skin material 32 such as a cloth. The skin material 23 is wound around the inner surface of the elbow rest cover 4 and is fixed to the elbow rest cover 4 by adhesion. And the lower rib 33 is formed over the full length in the lower end edge of the side plate 14 in the elbow pad cover 4, and the lower end of the cushion material 31 is applied to the lower rib 33. For this reason, even if the skin material 32 is stretched, the lower end portion of the cushion material 31 is not crushed and deformed, and the skin material 32 is held tightly by the lower rib 33.

  For example, as shown in FIG. 2 (C), the inner side surface 9 of the elbow support portion 5 is lightened at the portion between the front and rear side engagement holes 30 and the front and rear side engagement holes 30. And a stealing hole 34 for equalizing the wall thickness. Since the stealing hole 34 and the auxiliary horizontal hole 21 are covered with the side plate 9 of the elbow rest cover 4, there is no problem of beauty.

  In the above configuration, the elbow rest cover 4 is attached after the engaging pawl 19 is fitted into the pawl receiving hole 20 with the elbow rest cover 4 shifted to the near side from the reference position, and the elbow rest cover 4 is supported by the elbow. When the engaging claw 19 is engaged with the claw receiving portion 20a by shifting back in a state of being overlapped with the portion 5, the front engaging portion 13b is moved to the rear end of the elbow supporting portion 5 when the elbow rest cover 4 is pressed downward. And the side engaging claws 29 are fitted into the stealing holes 30. In this state, since the elbow rest cover 4 is accurately positioned, the screw 25 may be screwed. Thereby, the elbow rest cover 4 is fixed so that it cannot be displaced in the front-rear direction and the left-right direction.

  Although a female screw may be formed on the fastening boss body 22, in terms of cost, it is preferable to use a self-screwing tapping screw as the screw 25. By pressing the elbow rest cover 4 downward, the side engaging claws 29 are deformed against its elasticity and then fitted into the side engaging grooves 30.

  At the time of removal, after the fastening with the screw 25 is released, first, the rear end portion of the elbow rest cover 4 is raised upward. Then, the rear end portion of the elbow rest cover 4 bends upward with the portion of the slit 28 as the center, and thus the elbow rest cover 4 can be slid toward the front side. Therefore, there is no problem that the end engaging claw 19 breaks due to the bending force. In this case, since the positioning hole 18 and the upper front recess 23 are elongated holes in the front-rear direction, the elbow rest cover 4 is allowed to slide forward without impairing the positioning function.

  Then, when the elbow rest cover 4 is slid forward, the side engaging claw 29 is guided by the inclined surface of the stealing hole 30 and rotates in the direction of exiting from the stealing hole 30, and then, as shown in FIG. When the elbow rest cover 4 is raised upward in this state, the side engaging claws 29 are guided by the inclined guide surface 34a at the upper end of the guide groove 34 and smoothly removed. Therefore, in this embodiment, the elbow rest cover 4 can be smoothly removed while being firmly attached to the elbow rest main body 5 in a state where it cannot be rolled in use.

  In the present embodiment, the rear guide groove 34 of the front and rear guide grooves 34 is inserted into the upper side of the front guide groove 34. For this reason, when the elbow rest cover 4 is bent and raised, the rear portion of the elbow rest cover 4 moves upwards with little resistance, and therefore the elbow rest cover 4 can be smoothly raised with inertia. it can.

  Further, even if an upward external force acts on the outer end portion of the elbow rest cover 4 as indicated by an arrow X in FIG. 3A, the positioning boss body 17 is fitted in the positioning hole 18 and the side plate 14 Even if there is a gap between the upper plate 13 of the elbow rest cover 4 and the upper surface 11 of the elbow rest body 3, the outer side of the elbow rest cover 4 is It is possible to accurately suppress the rising of the edge. That is, when the outer edge 13c of the upper plate 13 is curled downward and applied to the upper surface 11 of the elbow rest body 3, the rigidity of the upper plate 13 is increased and it is preferable that the outer edge 13c is not easily hooked. However, in this state, the positioning boss body 17 and the side plate 9 act as a twist against the rising, so that the twisting can be effectively prevented. Even if an upward external force is applied to the elbow rest cover 4 from the inside as shown by an arrow Y in FIG. 3A, it is possible to prevent the positioning boss body 17 from rolling up.

  In this case, when the downward rib 16 of the elbow rest cover 4 and the upward rib 15 of the elbow support 5 are brought into contact with each other as in the embodiment, the ribs 15 and 16 are positioned on the left and right sides of the positioning boss body 17. Therefore, a high resistance (twisting) is exerted against any twisting action inside and outside, which is preferable. Further, it is preferable to provide the side engagement claws 29 and the side engagement holes 30 as in the embodiment because the inner side can be prevented more accurately. The seated person may put his thumb on the elbow rest cover 4, but since the cushion material 31 is stretched on the side plate 9 of the elbow rest cover 4, the seat is soft.

  The present invention is not limited to the above embodiment, and can be embodied in various ways. For example, the weakening means is not limited to the slit but may be thinned. The elbow support portion may have a rear end that is a free end, and the elbow rest main body may be T-shaped in a side view. The engaging means for holding the elbow rest cover so as not to move upward from the elbow support is not limited to the combination of the engaging claw and the claw receiving hole as in the embodiment, and other combinations may be employed. It is also possible to provide engagement means for holding the elbow rest cover so as not to move upward at the left and right intermediate portions at a plurality of positions in the front and rear.

  The armrest device of the present invention can be actually manufactured and can be used industrially.

DESCRIPTION OF SYMBOLS 1 Armrest device 3 Elbow pad main body 4 Elbow pad cover 5 Elbow support part 6 Post 9 Inner side surface of elbow support part 10 Outer surface of elbow support part 11 Upper surface of elbow support part 13 Upper plate of elbow pad cover 14 Side plate of elbow pad cover 15, 16 Ribs 17 Positioning boss body 18 Positioning hole 19 Engaging claw 20 Claw receiving hole 22 Fastening boss body 28 Slit as an example of weakening means 29 Side engaging claw constituting side engaging means 30 Side engaging means Constructing side engagement groove 33 Lower rib

Claims (6)

An armrest device on which a seated person can put an elbow,
It has an elbow rest main body having a long elbow support part in the front-rear direction and a resin elbow rest cover attached to the elbow rest main body, and the inner surface close to the seat is basically the outer periphery of the elbow rest main body. The outer surface on the opposite side of the seat is inclined or curved so as to approach the inner surface as it goes down, while the elbow rest cover overlaps the upper surface of the elbow rest main body. It has a plate and a side plate that overlaps the inner surface of the elbow rest main body, and has a cross-sectional inverted L shape.
Chair armrest device. On the lower surface of the upper plate of the elbow rest cover, a plurality of downwardly projecting positioning boss bodies are projected in a state spaced apart in the front-rear direction, while the elbow support portion of the elbow rest body has the elbow support A positioning hole is provided in which the positioning boss body of the abutting cover is fitted so that it cannot move left and right
The armrest device for a chair according to claim 1. The elbow rest body is a molded product of aluminum or light alloy,
The armrest device for a chair according to claim 1. A downward rib is provided on both sides or one side of the lower surface of the upper plate in the elbow pad cover so as to contact the elbow pad body, or the positioning is performed on the upper surface of the elbow pad body. An upward rib is provided on both sides or one side of the boss body and this is brought into contact with the elbow rest cover from below, or the positioning is performed on the lower surface of the upper plate and the upper surface of the elbow rest body in the elbow rest cover. Ribs that abut against each other on both sides or one side across the boss body,
The armrest device for a chair according to claim 2 or 3. One end of the front and rear end portions of the upper plate of the elbow rest cover is provided with an end-engaging claw that looks like a side view and projects downward, while one end portion of the elbow support portion of the elbow rest body includes The elbow rest cover is overlapped and then shifted toward the other end to open the claw receiving hole that the end engagement claw is caught and engaged upwards,
Side engagement means for making the side plate of the elbow support cover difficult to move upward is formed on the side plate of the elbow support cover and the inner side surface of the elbow support portion, and the end engagement claw is engaged with the nail receiving hole. When the elbow rest cover is pushed downward in a state in which it is made to be engaged, the engaging means provided on the side plate of the elbow rest cover and the inner side surface of the elbow support portion are set to engage with each other,
And a screw inserted from below into the elbow body is screwed into the end of the elbow pad cover opposite to the end engagement claw,
The armrest device for a chair according to any one of claims 2 to 4. The other end of the elbow rest cover opposite to the end engaging claw is fitted tightly to the other end of the elbow rest body, and the other end of the elbow rest cover and one end side with the screw interposed therebetween. A bent part that makes it easy to raise the other end of the elbow pad cover upward is formed at the position where the elbow pad cover is lifted. When removing the elbow pad cover from the elbow pad body, the fastening with the screw is released. Then, if the other end portion is raised, the entire elbow rest cover is set so that it can be easily slid in the direction of the end engaging claw, and the positioning boss slides in the front-rear direction. Has a long hole to allow
The armrest device for a chair according to claim 5.

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