JP2013063174A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the impairment of appearance caused by the exposure of screws without complicating structure, in a chair whose backrest is fixed to front faces of back support columns with the screws.SOLUTION: A back frame 7 has the left and right back support columns 29, and an upper back shell plate 10 is fixed to the back support columns 29 with the screws 31 which penetrate upper ends of the back support columns 29 from the rear. Elbow bodies 38 each having a lateral facing part 36 and an elbow support 37 are integrally formed at upper parts of the back support columns 29, and elbow covers 39 are attached to the elbow bodies 38. The elbow covers 39 have rear walls 77, and heads of the screws 31 for fixing the upper back shell plate 10 are covered with the rear walls 77. Thereby, the heads of the screws 31 are not exposed and the appearance is not impaired.

Description

  The present invention relates to a chair having a backrest and an armrest device.

  There are various types of chairs. As an example, there is a type in which an elbow body (elbow rest) extends from the side of the backrest toward the front.

  As an example, Patent Document 1 discloses that a pipe chair having a skeleton made of metal pipes has left and right legs formed in an inverted L shape in a side view having an upper horizontal portion and a foot portion extending downward from a front end thereof. In a configuration in which a backrest is attached to the rear end of the horizontal portion, it is disclosed that the upper horizontal portion of the left and right legs is an elbow body and an elbow cover is attached thereto. The elbow cover of Patent Document 1 is formed in a lateral L-shape so as to cover the entire upper horizontal portion of the leg and the upper end of the foot, and the elbow cover is fixed to the leg with a screw. .

  On the other hand, Patent Document 2 describes that an elbow body having a frame structure is fixed to a back frame in a rocking chair in which a backrest is attached to a back frame that is connected to a base so as to be tiltable backward. That is, the elbow body of this Patent Document 2 is a lateral portion that protrudes left and right outward from the upper end of the back strut constituting the back frame, and a longitudinal longitudinal elbow rest extending from the front end of the lateral portion toward the front, And a support part extending downward from the tip of the elbow pad, and the lower end of the support part is fixed to the front end of the back frame. A cushion is attached to the upper surface of the elbow rest.

  As described in Patent Document 3, it has also been proposed to connect the backrest and the seat with an L-shaped elbow body that is laterally viewed from the side. Furthermore, as described in Patent Document 4, for example, a type in which an elbow body projects forward from the left and right sides of the backrest, that is, a type in which the front end of the elbow body is a free end has been proposed.

CD-ROM of Japanese Utility Model Publication No. 5-74347 JP 2005-73872 A CD-ROM of Japanese Utility Model Publication No. 5-34960 JP 11-206510 A

  In each of these patent documents, the elbow rest extends from the outside of the backrest to the front, so that it can be said that the length of the elbow rest is increased and the usability is good. In particular, in the case of a chair installed in a conference room or lecture hall, a seated person often applies the elbow for a long time while leaning on the back, but if the user continues to apply the elbow for a long time like this, In the types such as Patent Documents 1 to 4, it can be said that since the support area of the elbow can be increased, the comfort holding function is high.

  Now, since the elbow body must ensure strength, it is often a die-cast product made of metal or a molded product made of resin, but when the human arm directly hits the elbow body, If it is desired to change the shape of the elbow rest, there is a problem that the cost is increased because the entire mold must be changed.

  On the other hand, if an elbow cover is provided as in Patent Document 1, the elbow body can be dealt with by changing the shape of the elbow cover, etc. without special processing. There is an advantage of high flexibility. In addition, the elbow cover can be made of a soft material or a good-looking material, so there is an advantage that the product value can be improved by improving the feeling of use and appearance. .

  The present invention has been made against the background of such a situation, and an improved form is to be provided in a chair having an elbow rest extending forward from the side of the backrest.

  The chair according to the present invention has a seat and a backrest, and the backrest is fixed to a vertical frame disposed behind the backrest, and the lateral direction protrudes from the upper end of the vertical frame to the left and right outside from the upper end of the vertical frame. It has a basic configuration in which an elbow body having a portion and an elbow rest extending forward from the tip of the lateral portion is integrally provided. And in invention of Claim 1, in the said basic composition, the resin-made elbow covers which cover the whole upper surface of the said sideways part and an elbow pad part are mounted | worn with the said elbow body.

  The present invention can be variously developed as described in claim 2 and the following. That is, the invention according to claim 2 is the invention according to claim 1, wherein the vertical frame is arranged on the left and right sides on both sides of the intermediate portion of the backrest, and thus the left and right vertical frames have inner surfaces facing each other. A downward rear wall that covers the upper rear surface of the vertical frame and a downward rear inner wall that covers the upper inner surface of the vertical frame are formed at the rear end of the elbow cover.

  According to a third aspect of the present invention, in the second aspect, the backrest includes a back shell plate as a strength member and a cushion stretched on the front surface thereof, and the back shell plate and the vertical frame are arranged in the vertical direction. The upper end of the frame is fastened with a screw inserted from behind, and the head of the screw is covered from behind by the rear wall of the elbow cover.

  According to a fourth aspect of the present invention, in any one of the second or third aspect, the elbow cover includes a downward front wall that covers the front end surface of the elbow rest in the elbow body from the front, and an elbow rest in the elbow body. An outer wall facing downward and an inner wall overlapping the inner surface, and an engagement portion is provided on the front wall or the outer wall or the inner wall to hold the elbow cover so that it cannot be displaced backward and cannot be separated upward. The elbow cover is held by the rear wall so that it cannot be displaced forward.

  The elbow body of the present invention has a high strength because it is integrally provided on a vertical frame as a strength member to which the backrest is fixed. And since the elbow cover has covered the whole elbow main body from the top, it can be completed in a state with the beautiful appearance and the touch by improving an elbow cover, without processing an elbow main body.

  In other words, it is possible to increase the degree of completion of the armrest device by finely adjusting the mold for manufacturing the elbow cover without changing the mold of the vertical frame provided with the elbow body, For this reason, it becomes possible to provide a high-quality chair with the cost suppressed as much as possible. In particular, since the horizontal portion of the elbow body is also covered with the elbow cover from above, the area covered with the elbow cover is large, and the aesthetic appearance is particularly excellent.

  In the invention of claim 2, two vertical frames are arranged behind the backrest as in Patent Document 2, and the upper rear surface and the upper inner surface of the vertical frame are covered with an elbow cover. That is, the rear part of the elbow cover is fitted to the upper part of the vertical frame. For this reason, the elbow cover can be attached to the elbow body stably and free of backlash even when the elbow cover is mounted by an engagement means such as a combination of a claw and an engagement hole. Further, the rear part of the elbow cover is difficult to be caused by a human hand due to the presence of the rear wall and the rear inner side wall (it is difficult to be caught even if a person hits the fingertip), and thus the attachment strength is high.

  The backrest often has a structure in which a cushion is stretched on the front surface of the back shell plate (back plate, back inner shell). In this case, if screws are used as a fixing means between the back shell plate and the vertical frame, there are few fastening points. It is an advantage that can be firmly fixed with. In that case, if the screw is inserted into the back shell plate and screwed in, the assembly work of the chair is troublesome because the fastening work cannot be done unless the cushion is removed or the skin material is peeled off. When integrated with the back shell plate, there is a problem that it is difficult to apply.

  On the other hand, if the screw is inserted into the vertical frame from behind, it can be fastened with the back shell cushioned, so in other words, the chair can be fixed to the vertical frame with the backrest completed. However, the screw head and the screw insertion hole are exposed to the back, which may impair the aesthetic appearance.

  On the other hand, if the configuration of claim 3 is adopted, the screw head (also including the screw insertion hole) is covered with the back wall of the elbow cover while adopting the method of inserting the screw into the vertical frame from the back. Can be used to prevent the screw head from being exposed and prevent the appearance from deteriorating. That is, there is an advantage that the assembling workability of the chair can be improved and the application range can be expanded without deteriorating the aesthetic appearance. Therefore, it can be said that it is particularly suitable for a chair of a type in which a cushion is insert-molded in the back inner shell.

  As a means of attaching the elbow cover to the elbow body, for example, it is possible to screw a screw inserted into the elbow body from below into the elbow cover. There is a problem that it becomes impossible to install.

  On the other hand, when the elbow cover is mounted using the elastic deformation as in the fourth aspect, the elbow cover can be easily attached and the problem that the attachment becomes impossible can be solved. Moreover, since the elbow cover covers the elbow rest and the vertical frame from above, the elbow cover is held so as not to move in any of front, rear, left and right. Therefore, the elbow cover can be securely attached to the elbow body without fastening the screws.

It is a figure which shows the external appearance of the chair which concerns on embodiment, (A) is a front view, (B) is a side view, (C) is a top view, (D) is a rear view, (E) is a partial perspective view. is there. (A) is the whole isolation | separation perspective view, (B) is the isolation | separation perspective view in the state which turned over the base. (A) is a separated perspective view of a shell plate and a reinforcing plate, and (B) is a separated perspective view of a cushion. FIG. FIG. 5 is a side sectional view of a portion centered on a seat as seen from the VV viewing direction of FIG. 4. FIG. 6A is a partial cross-sectional view taken along the line VIA-VIA in FIG. 5, and FIG. FIG. 7 is a partial sectional view taken along the line VII-VII in FIG. 5. (A) is the isolation | separation perspective view which looked back at the body receiving part, (B) is the fragmentary perspective view which looked at the lower back shell board from the downward | lower direction. (A) is a separated perspective view of the upper back shell plate and the reinforcing plate, (B) is a perspective view of the lower portion of the upper back shell plate as viewed from the rear, and (C) is a cross-sectional view taken along the line CC of (A). is there. It is a separation plane sectional view of an upper back shell board, a reinforcing board, and a back support. It is sectional drawing after the assembly seen in the location of FIG. (A) is the perspective view which isolate | separated the elbow cover, (B) is the perspective view in the state which attached the elbow cover, (C) is the partial perspective view of an elbow cover, (D) is the partial perspective view of a back strut. . (A) is the principal part isolation | separation perspective view which looked at the back frame from back, (B) is the isolation | separation top view of the principal part in the state which turned the elbow cover upside down. (A) is a perspective view of the elbow body as seen from the inside, (B) is a perspective view of the elbow body as seen from the outside, (C) is a view with the elbow cover attached in the XIVC-XIVC viewing direction of FIG. It is sectional drawing seen from. 13A is a sectional view taken along line XVA-XVA in FIG. 13A, FIG. 13B is a sectional view taken along line XVB-XVB in FIG. 13B, and FIG. 14C is a sectional view taken along line XVC-XVC in FIG. It is.

  Next, an embodiment of the present invention will be described with reference to the drawings. In the following description, the words “front and back” and “left and right” are used to specify the direction, but this wording is based on the direction of a normal seated person. However, the front view refers to the direction facing the seated person. The words “inside” and “outside” are also used, but the direction toward the center of the chair is inward and the opposite direction is outward.

(1). Outline of Chair First, an outline of a chair will be described with reference to FIGS. The present embodiment is applied to a swivel chair. As shown in FIG. 1, the chair includes a body receiving portion 3 in which a seat 1 and a backrest 2 are integrally continuous, a leg device 5 having a leg column 4, and a leg. It has a base 6 attached to the upper end of the support column 4 and a back frame 7 connected to the base 6 so as to be able to tilt backward. The leg device 5 has branch legs extending in the radial direction, and a caster is provided at the tip of each branch leg. The base 6 and the back frame 7 are an aluminum die cast product or a resin molded product.

  As can be understood from FIGS. 2 and 3, the body receiving portion 3 has a shell plate and a cushion formed integrally therewith. The shell plate includes a seat shell plate 8 constituting the seat 1, a lower back shell plate 9 integrally connected to the rear portion of the seat shell plate 8, and an upper back shell plate 10 that is separate from the lower back shell plate 9. And the lower end portion of the upper back shell plate 10 is connected to the upper end portion of the lower back shell plate 9. Therefore, the shell plate of the backrest 2 is constituted by the upper and lower back shell plates 9 and 10. Each of the shell plates 8, 9, and 10 is a resin molded product, and a large number of ribs extending vertically and horizontally are formed on the back surface.

  Note that the words “lower” and “upper” used for the back shell plate are used to specify two elements that are divided into upper and lower parts, and are not used to specify the height position. Absent. Therefore, the upper back shell plate 10 may constitute a large part of the backrest 2 (about 70 to 80%) as in the present embodiment, or the lower back shell plate 9 may constitute the majority of the backrest 2. The upper and lower shell plates 9 and 10 may have the same vertical dimension.

  As shown in FIG. 3 (B), the cushion is divided into a lower cushion 11 corresponding to the seat shell plate 8 and the lower back shell plate 9, and an upper cushion 12 corresponding to the upper back shell plate 10. These cushions 11 and 12 are insert-molded on the shell plates 8, 9 and 10, respectively. Although not described in detail, the lower cushion 11 covers the entire surface of the seat shell plate 8 and the lower back shell plate 9 and is formed so as to be wound up to the back side of the end edges of the seat shell plate 8 and the lower back shell plate 9. ing. On the other hand, the upper cushion 12 is formed so as to wrap the entire front and rear surfaces of the upper back shell plate 10.

  The body receiving part 3 has an integral skin material, and the part of the skin material located on the backrest 2 is formed in a bag shape that covers the back shell plates 9 and 10 and the cushions 11 and 12 completely from above. The portion of the skin material corresponding to the seat 1 is wound downward from the outer periphery of the seat shell plate 8. Therefore, most of the appearance of the chair is made of a skin material.

  The seat shell plate 8 and the lower back shell plate 9 are separated by slits 14 except for the hinge portions 13 at both left and right ends. In other words, the seat shell plate 8 and the lower back shell plate 9 are connected only by the hinge portions 13 at the left and right ends. For this reason, the lower back shell plate 9 (backrest 2) can tilt backward relative to the seat shell plate 8 (relative to the seat 1) by deformation of the hinge portion 13.

  As shown in FIGS. 2 and 4, the base 6 has a generally rectangular shape in plan view and has a frame structure opened upward and downward. For this reason, the base 6 includes a rear member 16, left and right side members 17, and a front member 18. A leg strut mounting hole 19 is formed in the left and right middle part of the rear member 16, and a rearward projecting part 20 is formed at the rear end part of the rear member 16, and the back frame 7 is a laterally long support shaft on the rearward projecting part 20. 21 are connected.

  As shown in FIG. 1B, there is a space between the rear surface of the base 6 and the front end of the lower portion of the back frame 7 on both the left and right sides of the rearward projecting portion 20. Therefore, even if the back frame 7 is tilted, a size larger than that of a general adult finger is maintained. Therefore, even if a person inserts a fingertip into the gap between the base 6 and the back frame 7, the person is not caught.

  As shown in FIGS. 2 and 4, longitudinal rail members 22 are slidably attached to the left and right side members 17 of the base 6, and a seat shell plate 8 is attached to the rail members 22. The rail member 22 moves backward against the spring 23 incorporated therein.

  For example, as shown in FIG. 2 (A), the back frame 7 has a laterally long base 24 that forms the lower end of the back frame 7, and the left and right intermediate portions of the base 24 are connected to the base 6 via a bearing bracket 25. It is connected to the rearward projecting portion 20 by a support shaft 21. Similarly, as can be understood from FIG. 2A, upward bearing ribs 27 located between the left and right bearing portions 26 provided at the rear end of the rail member 22 are provided at the left and right ends of the base 24 in the back frame 7. And a bearing portion 26 of the rail member 22 and a bearing rib 27 of the back frame 7 are connected by a horizontally long pin 28.

  Back struts 29 are formed integrally with the left and right ends of the base 24 in the back frame 7 and are raised backwards and then raised upward. The bosses 30 project forward from the upper ends of the back struts 29. The upper back shell plate 10 is fastened with screws (screws) 31. The back column 29 is an example of a vertical frame described in the claims. The back strut 29 functions as a strut of the armrest device. Therefore, the back strut 29 can also be called an elbow strut.

  A horizontally long recess 32 that opens forward is formed in the lower part of the front surface of the upper back shell plate 10, and a horizontally long reinforcing plate 33 made of metal (steel plate) is fitted in the recess 32, and screw 31 is screwed into a burring portion 34 formed on the reinforcing plate 33. Therefore, the back column 29, the upper back shell plate 10, and the reinforcing plate 33 are fastened together with the screws 31.

  At the upper end of the back strut 29, a laterally extending portion 36 that protrudes left and right along the back surface of the backrest 2 is integrally formed, and a front and rear longitudinal elbow rest 37 is integrally formed at the tip of the laterally facing portion 36, The laterally facing portion 36 and the elbow rest portion 37 constitute an elbow body 38. In other words, an elbow body 38 having a bent shape in plan view is integrally formed at the upper end of the back column 29. An elbow cover 36 that covers the entire upper surface of the elbow body 38 is attached.

(2). Supplementary Explanation of Support Mechanism Next, details of each part will be described with reference to FIG. Prior to the description of the armrest device, first, a supplementary explanation will be given of the support mechanism portion centered on the base 6.

  As described above, the back frame 7 is connected to the rearward projecting portion 20 of the base 6 through the bearing bracket 25 at the left and right intermediate portions. However, as shown in FIG. 2 (A) and FIG. The base 24 is formed with a recess 41 into which the bearing bracket 25 is fitted so that it cannot be displaced laterally. A screw 42 inserted into the base 24 of the back frame 7 from above is screwed into the bearing bracket 25. The support shaft 21 passes through a side plate 20 a provided in the rearward projecting portion 20 of the base 6, and is held by a recess 41 of the base portion 24 in the back frame 7 so that it cannot be removed from the left and right.

  Next, the location of the rail member 22 will be described. As shown in FIGS. 6 to 7, the rail member 22 has a channel-like (U-shaped) shape that opens downward, and the seat shell plate 8 has a pair of left and right downward regulating ribs 43 that surround the rail member 22 from both left and right sides. It is provided one by one. As shown in FIG. 6B, the downward regulating rib 43 is integrally provided with positioning ribs 44 that are close to the rail member 22 from the inside and outside, and the front and rear longitudinal stoppers 45 cut and raised on the rail member 22 are formed. The engaging claw 46 formed on the downward regulating rib 43 is applied from below. Therefore, the seat shell plate 8 is held so as not to be separated upward with respect to the rail member 22, and the seat shell plate 8 and the rail member 22 can be relatively moved in the front-rear direction.

  As shown in FIGS. 5 and 6A, a horizontally long guide pin 47 is inserted through the front end portion of the rail member 22 so as not to move back and forth. As shown in FIG. Is inserted through a guide hole 49 formed in a guide body 48 fixed to the side member 17 of the base 6. The guide hole 49 is a long hole in the longitudinal direction (see FIG. 5), so that the rail member 22 can slide back and forth together with the seat shell plate 8.

  As shown in FIGS. 5 and 7, a front spring receiver 50 is attached to the front / rear intermediate portion of the rail member 22 to support a spring (compression coil spring) 23 from the front side. The rear end of the spring 23 is supported by a rear spring receiver 51 fixed to the side member 17 of the base 6. Therefore, the rail member 22 can move backward against the elasticity of the spring 23. Since the rear end of the rail member 22 is connected to the back frame 7, when the seated person leans against the backrest 2 and the back frame 7 tilts backward, the rail member 22 moves backward and the backrest 2 tilts backward. .

  In this case, since the upper back shell plate 10 is fixed to the upper end of the back column 29, the upper back shell plate 10 rotates about the support shaft 21, whereas the seat shell plate 8 is a rail member. Since the shell plates 8, 9, and 10 have a rigid structure, the movement of the seat shell plate 8 and the movement of the back shell plates 9, 10 are restricted and cannot be locked. However, in the present embodiment, the seat shell plate 8 and the lower back shell plate 9 are connected via the elastically deformable hinge portion 13, and thus can be locked without hindrance. As shown in FIG. 5, a base cover 52 is attached to the upper surface of the rear member 16 in the base 6.

(3). Structure of the backrest Next, the structure of the backrest 2 will be described. For example, as shown in FIG. 8, a large number of reinforcing ribs 54 extending in the vertical and horizontal directions are formed on the back surfaces of the lower back shell plate 9 and the upper back shell plate 10. The hole 55 is vacant. The upper and lower back shell plates 9 and 10 are insert-molded with cushions 12 and 11 on both the front and back surfaces. During insert molding, the resin material passes through the window hole 55 and the back shell plates 9 and 10 Go around the back.

  As described above, the upper back shell plate 10 constitutes a substantial portion (about 70%) of the total height of the backrest 2. Overlapping portion rib plates 56 and 57 are formed on the lower surface of the upper back shell plate 10 and the upper surface of the lower back shell plate 9, respectively. A mating projection 58, side engagement projections 59 located at both left and right ends, and an intermediate positioning projection 60 located between the center engagement projection 58 and the side engagement projection 59 are provided to project downward.

  On the other hand, on the upper part of the lower back shell plate 9, a center pocket portion 61 into which the center engaging projection 58 is fitted, a side pocket portion 62 into which the side engaging projection 59 is fitted, and an intermediate pocket portion into which the intermediate positioning projection 59 is fitted. 63 is opened upward. Although details are omitted, the center engaging projection 58 and the side engaging projection 59 have a function of preventing the removal, and the intermediate positioning projection 59 has a positioning function.

  The overlap portion rib plate 57 of the lower back shell plate 9 has a shape in which a considerable range including the intermediate portion thereof is recessed downward in a front view, while the overlap portion rib plate 56 of the upper back shell plate 10 is A considerable range including the left and right intermediate portions protrudes downward. That is, the mating surfaces of the upper and lower back shell plates 9 and 10 are uneven as viewed from the front. And the inner side surface 57a of the recessed part of the overlap part rib plate 57 in the lower back shell plate 9 is inclined, and the intermediate pocket part 63 is formed in a state straddling the bottom surface of the recessed part and the inclined inner side surface 57a. Yes. On the other hand, the outer surface 56a of the convex portion of the overlapping portion rib plate 56 in the upper back shell plate 10 is also inclined, and the intermediate positioning projection 60 is formed in a state straddling the lower surface and the inclined surface of the convex portion. .

  For example, as shown in FIG. 9, the lower portion of the upper back shell plate 10 is bent in a concave shape in a plan view, and the reinforcing plate 33 disposed below the upper back shell plate 10 is also bent in a forward shape in a plan view. doing. That is, a considerable range including the intermediate portion of the reinforcing plate 33 is a base portion extending in a horizontally long straight line in a plan view, but a certain range near both the left and right ends includes an inclined portion 33a bent toward the front side. In addition, a laterally long end portion 33b is formed at the tip of the inclined portion 33a in plan view. A burring portion 34 is projected forward from the end portion 33b. As shown in FIGS. 10 and 11, a screw 31 is screwed into the female screw formed on the burring portion 34 from behind.

  Naturally, the upper back shell plate 10 has a screw insertion hole 64. The upper back shell plate 10 is formed with a receiving seat 65 into which the boss portion 30 of the back column 29 is fitted. As shown in FIG. 9B, the receiving seat 65 is formed in a state surrounded by ribs 66. In addition, a counterbore 67 into which the head of the screw 31 enters is formed on the back surface of the back column 29 at the location of the boss 30. Note that a nut may be welded to the reinforcing plate 33 instead of forming the burring portion 34.

  The reinforcing plate 33 is formed with left and right horizontally elongated ribs 68 for reinforcement except for the end portion 33b. Further, positioning holes 69 are provided in the left and right ends of the base portion and the end portion 33b of the reinforcing plate 33, and positioning pin portions 70 that fit into the positioning holes 69 are provided on the upper back shell plate 10 so as to project. . The end portion 33b has a pair of upper and lower positioning holes 69. Further, as shown in FIGS. 9A and 9C, holding claws 71 for holding the reinforcing plate 33 from above and below are provided at portions of the upper back shell plate 10 corresponding to the left and right ends of the base portion of the reinforcing plate 33. Forming. When the reinforcing plate 33 is strongly pushed into the recess 31, the holding claw 71 is elastically deformed and then returned to the original, so that the reinforcing plate 33 is held so as not to drop off.

  As shown in FIG. 2A, an upper hook-like lower engaging claw 72 is projected from the front surface of the back column 29 at a substantially middle height position in the vertical direction. On the other hand, as shown in FIG. 8, on the back surface of the lower back shell plate 9, a pocket-shaped lower receiving portion 73 having an upward opening into which the lower engaging claw 72 is fitted from above is formed. Therefore, the lower back shell plate 9 is also connected to the back column 29 so as not to be separated from the front and rear. The lower back shell plate 9 and the back column 29 can be fastened with screws. However, when the engaging means including the engaging claw 72 and the receiving portion 73 is employed as in this embodiment, the assembly is simple. In addition, there is an advantage that the back surface of the back column 29 is clean.

(4). Armrest Device Next, an armrest device (also referred to as an armrest portion) will be described with reference to the drawings from FIG. As described above, an elbow body 38 including a lateral portion 36 and an elbow rest portion 37 is integrally formed at the upper end of the back column 29, and the elbow body 38 and the elbow cover 39 constitute an armrest device. . The elbow cover 39 is a resin molded product.

  For example, as shown in FIG. 10, the back column 29 has a flat cross-sectional shape close to a horizontally long rectangle. On the other hand, as shown in FIG. 15 (C), the laterally facing portion 36 of the elbow main body 38 is vertically long in a side sectional view, and can be understood from, for example, FIG. 12 and FIG. ), The horizontal portion 36 has a shape in which the vertical height decreases toward the outside in a front view (the vertical width decreases). In addition, the elbow pad 37 basically has a plate-like shape with a small vertical thickness with respect to the lateral width, but the thickness gradually decreases toward the front end. In the plan view, the laterally facing portion 36 is much thinner than the elbow rest portion 37.

  The elbow cover 39 includes a substrate 76 that overlaps the upper surfaces of the elbow body 38 and the back column 29, and a rear wall 77 that extends downward from the rear portion of the substrate 76 and overlaps the lateral portion 36 and the back surface of the back column 29. The substrate 76 has a downward front wall 78 that covers the front end surface of the elbow rest 37 from the front, a downward outer wall 79 that overlaps the outer surface of the elbow rest 37, and an inner wall 80 that overlaps the inner surface of the elbow rest 37. Are integrally formed. On the lower surface of the substrate 76, ribs having a low height are formed so as to extend vertically and horizontally.

  The front wall 78, the outer wall 79, and the inner wall 80 do not completely cover the outer periphery of the elbow rest 37, and the lower ends of the walls 78, 79, 80 are in contact with stepped portions 81 formed on the outer periphery of the elbow rest 37. Close or close. Therefore, the lower end edge of the outer periphery of the elbow pad 37 is exposed to the outside. Since the lower ends of the walls 78, 79, 80 are covered from below by the step portions 81 of the elbow pads 37, human fingertips do not hit the lower ends of the walls 78, 79, 80. 79 and 80 are prevented from being caused.

  As shown in FIGS. 14B and 14C, a rear-facing front engaging claw 82 is formed at the lower end of the front wall 78 of the elbow cover 39, while a stepped portion is formed on the front end surface of the elbow pad 37. A front engaging hole 83 that is continuous with the portion 81 is formed. Therefore, the front end of the elbow cover 39 is held so as not to be raised upward. The front engaging claws 82 and the front engaging holes 83 are examples of engaging portions described in the claims.

  As shown in FIGS. 14 and 15B, an inward external engagement claw 84 is formed on the lower end of the outer wall 79 of the elbow cover 39 near the front end, while the elbow rest 37 An outer engagement hole 85 that is continuous with the stepped portion 81 is formed on the outer end surface. In this case, as shown in FIG. 14B, the elbow rest portion 37 is cut upward in front of the external engagement hole 85 (the cut portion is indicated by reference numeral 86 in FIG. 14B). Therefore, when the elbow cover 39 is slid from the front to the back, the front engaging claw 82 can be fitted into the front engaging hole 83 and the external engaging claw 84 can be fitted into the external engaging hole 85. Can do.

  As shown in FIG. 14 and FIG. 15 (B), the inner wall 80 of the elbow cover 39 is formed with outward internal engaging claws 87 at the lower ends of the front and rear portions (three locations), while the elbow rest An internal engagement hole 88 that is continuous with the stepped portion 81 is formed on the inner end surface of the portion 37. The internal engagement hole 88 is opened only inward of the chair. Therefore, the internal engagement claw 87 is fitted into the internal engagement hole 88 due to the elastic deformation of the elbow cover 39 accompanying the pressing from above. A guide groove 89 through which the internal engagement claw 87 passes is formed on the inner surface of the elbow pad 37. The inner and outer engaging claws 84 and 87 and the engaging holes 85 and 88 also form part of the engaging portion described in the claims.

  For example, as shown in FIG. 15C, a rear front wall 90 that overlaps the laterally facing portion 36 and the back strut 29 from the front is formed on the rear portion of the substrate 76 of the elbow cover 39 that overlaps the laterally facing portion 36 and the back strut 29. ing. The downward projecting dimension of the rear front wall 90 is slight and is fitted to the rear front step portion 91 formed in the lateral portion 36 and the back column 29. The rear front step portion 91 is smoothly continuous with the step portion 81 formed on the inner surface of the elbow pad portion 37. Therefore, the lower end of the inner wall 80 of the elbow cover 39 and the rear front wall 90 are smoothly continuous while changing the height (while the vertical width decreases as going back).

  For example, as shown in FIG. 15C, the portion of the rear wall 77 of the elbow cover 39 that overlaps the lateral portion 36 covers the portion of the rear surface of the lateral portion 36 excluding the lower end edge. A rear rear stepped portion 93 is formed at the lower end of the rear surface of the laterally facing portion 36, and the rear wall 77 is covered from below with the rear rear stepped portion 93. For example, as shown in FIG. 15A, a stepped portion 93 is also formed on the back column 29. Due to the presence of the stepped portion 93, the outer peripheral surface of the back column 29 and the elbow cover 39 are substantially flush with each other (both the elbow body 38 and the elbow cover 39 have the same outer periphery due to the presence of the stepped portions 81 and 91. ing.).

  A stopper piece 94 that is obliquely downward in a side view is integrally provided on the front surface of the lower end portion of the rear wall 77 that overlaps the laterally facing portion 36, while the stopper piece 94 is facing backward on the back surface of the laterally facing portion 36. An upward stopper protrusion 95 is formed to be held impossible. For this reason, the rear wall 77 is held in a state where it is overlapped with the back surface of the laterally facing portion 36, and it has a good appearance. The rear wall 77 and the outer wall 79 are smoothly continuous.

  An escape hole 96 opened in front of the stopper projection 95 is formed in the lateral portion 36 constituting the elbow body 38. The relief hole 96 is for facilitating the mold release during molding. That is, the back frame 7 is manufactured by a mold that relatively moves in the front-rear direction, but by providing the relief hole 96 as shown in FIG. 15C, the stopper projection 95 can be formed without providing a slide mold. is there. As shown in FIG. 15A, a stopper piece 94 is also formed on a portion of the rear wall 77 of the elbow cover 39 that overlaps the back column 29, and a stopper projection 95 is formed on the back column 29.

  For example, as shown in FIG. 12, since there are two back struts 29 on the left and right, the back struts 29 have inner surfaces 29a facing each other. The elbow cover 39 is integrally formed with a rear inner wall 97 that covers the upper part of the inner surface 29a of the back column 29, and the substrate 76, the rear wall 77, and the rear inner wall 97 are integrally continuous. In addition, the substrate 76, the rear front wall 90, and the rear inner wall 97 are also continuous integrally. For this reason, the rear part (or the whole) of the elbow cover 39 has a groove shape that opens downward, and as a result, the elbow cover 39 is held so as not to be displaceable from front to back and from side to side with respect to the back column 29 and the sideways part 36.

  Further, as clearly shown in FIG. 12 (C), a forward-facing end engagement protrusion 98 is provided at the lower end portion of the rear inner side wall 97, while the upper end portion of the back strut 29 is provided as shown in FIG. 12 (D). An end engagement hole 99 having a forward opening is formed in the two, and both are fitted. For this reason, the elbow cover 39 is held so as not to be removed at the rear end portion. This is an example of an engagement means that engages the end engagement protrusion 98, the end engagement hole 99, and the elbow cover 39 by elastic deformation.

  For example, as shown in FIG. 14A, a frame-like rib 30a surrounding the boss 30 is formed in front of the upper portion of the back column 29, and the rib 66 (see FIG. 9) of the upper back shell plate 10 is formed by the frame-like rib 30a. Reference) is enclosed. 15B, a cushioning material 76a such as an elastomer may be provided on at least the upper surface of the substrate 76 in the elbow cover 39. The cushion material 76a may be bonded or insert molded.

(5). Conclusion The elbow cover 39 is attached to the elbow rest 37 in a state where the elbow cover 39 is shifted to the front rather than the set state, and the outer part is slightly inclined in front view so that it slides backward. First, the front engagement claw 82 is fitted into the front engagement hole 82 and the external engagement claw 84 is fitted into the external engagement hole 85, and then the entire elbow cover 39 is pressed downward. The internal engagement claw 87 is fitted into the internal engagement hole 88, the stopper piece 94 is engaged with the stopper projection 95, and the end engagement projection 98 is fitted into the end engagement hole 99. . Therefore, attachment can be performed quickly and easily. For removal, first, the end engaging protrusion 98 may be detached from the end engaging hole 99, and then the rear portion of the elbow cover 39 may be lifted back and then moved forward.

  The elbow cover 39 is held so as not to be separated upward at the front and left and right sides with respect to the elbow pad 37 and is held so that it cannot be displaced forward and backward by the front walls 78 and 90 and the rear wall 77. Furthermore, the end engagement protrusion 98 is also held so as not to be separated upward. Therefore, it can be easily attached, but is held in a state where it is difficult to peel off.

  And since the reinforcement board 33 is provided in the upper back shell board 10, even if it is the structure where the left and right back support | pillars 29 were independent, a robust structure can be ensured as a whole, but the back support | pillar 29, the upper back shell board 10, and Since the head of the screw 31 that fastens the reinforcing plate 33 is hidden by the rear wall 77 of the elbow cover 39, the appearance of the screw 31 is not deteriorated due to the exposed head. More specifically, it is necessary to reinforce the upper back shell plate 10 with the reinforcing plate 33 when the lower back shell plate 9 tilts backward with respect to the seat shell plate 8, but in this embodiment, a separate cover is used. Even if not, the reinforcing plate 33 can be fixed using the elbow cover 39 without exposing the screw 31.

  As described above, the shell plates 9 and 10 constituting the backrest 2 are covered with the upper cushion 12 from the front and rear, and further covered with the bag-like skin material 100 (see FIG. 11). Further, in the present embodiment, the seat 1 and the backrest 2 are integrated, and only the backrest 2 cannot be separated and fixed to the back column 29. Accordingly, the screw 31 must be inserted into the back column 29 from behind, but the head of the screw 31 is hidden by the rear wall 77 of the elbow cover 39, so that there is no problem of deterioration of aesthetics. Therefore, it can be said that the present invention is particularly suitable for a chair in which the seat 1 and the backrest 2 are integrated.

(6). Others The present invention can be embodied in various ways other than the above embodiment. For example, the application target chair is not limited to a swivel chair or a back seat integrated system, but can be applied to various types of chairs. The vertical frame is not limited to the left and right two-line system, but may be a single-line system. The specific form of the elbow body can be arbitrarily changed according to the request of the design and the like. The elbow body does not necessarily have its front end as a free end, and a configuration in which a downward support portion is integrally provided at the front end of the elbow body as in Patent Document 2 can also be adopted.

  When the present invention is applied to a chair in which a seat and a backrest are integrated, the seat shell plate and the back shell plate can be configured as a single body. Moreover, when it is set as 2 parts structure, it is also possible to isolate | separate into a seat shell board and a back shell board.

  The present invention can be embodied in a chair. Therefore, it can be used industrially.

1 seat (seat)
2 Backrest (back)
DESCRIPTION OF SYMBOLS 3 Body receiving part 6 Base 7 Back frame 8 Seat shell board 9,10 Back shell board 29 Back support | pillar 29a inner surface as an example of a vertical frame 30 Boss 36 Elbow body sideways part 37 Elbow body elbow pad part 38 Elbow body 39 Elbow cover 77 Rear wall of elbow cover 78 Front wall of elbow cover 79 Outer wall of elbow cover 80 Inner wall of elbow cover 82, 84, 87 Engagement claws 83, 85, 88 Joint hole 97 Rear inner wall

Claims (4)

A seat and a backrest, the backrest being fixed to a vertical frame disposed behind the seat; a lateral portion projecting outward from the upper end of the vertical frame to the left and right sides; and a distal end of the lateral portion An elbow body having an elbow rest extending from the front to the front is integrally provided,
A resin elbow cover that covers the entire upper surface of the laterally facing portion and the elbow pad is attached to the elbow body.
Chair. The vertical frame is arranged on the left and right sides on both sides of the middle part of the backrest, and thus the left and right vertical frames have opposite inner surfaces,
On the rear end of the elbow cover, a downward rear wall covering the upper rear surface of the vertical frame and a downward rear inner wall covering the upper portion of the inner surface of the vertical frame are formed.
The chair according to claim 1. The backrest has a back shell plate as a strength member and a cushion stretched on the front surface thereof, and the back shell plate and the vertical frame are fastened with screws inserted from the back into the upper end portion of the vertical frame. The head of the screw is covered from behind by the back wall of the elbow cover,
The chair according to claim 2. The elbow cover has a downward front wall that covers the front end surface of the elbow pad in the elbow body, a downward outer wall that overlaps the outer surface of the elbow pad in the elbow body, and an inner wall that overlaps the inner surface. An engaging portion is provided on the front wall, the outer wall, or the inner wall to hold the elbow cover so that it cannot be displaced backward and cannot be separated upward, and the elbow cover is held by the rear wall so that it cannot be displaced forward. Yes,
The chair according to claim 2 or 3.

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