JP2013022080A - Chair, and seat for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair which is such type that the front part of a seat is downwardly rolled in and deformed and which secures both supporting strength and coziness at sitting.SOLUTION: The chair is structured as follows: the front part of a seat inner shell 7 includes a deformation-allowable part 7c having a lot of front slits 28; the chair is separately composed of a fixed outer shell 9 and a slide outer shell 10; the slide outer shell 10 is composed of a plate-like base part 10a and right and left arm parts 10b and connected to the fixed outer shell 9 to be unable to go through but to be flexible in forward/backward sliding; and a main supporting part 7a supporting the most part of the human body of the seat inner shell 7 is supported with a side support part 38 of the fixed outer shell 9, so that the arm part 10b of the slide outer shell 10 is not strongly pressed by the seat inner shell 7. Such a structure enables the slide outer shell 10 to lightly slide back and forth while the user stays seated.

Description

  The present invention relates to a chair and a seat portion constituting the chair.

  In the chair, as a technique for adjusting the longitudinal length of the seat (depth of the front end), for example, as disclosed in Patent Documents 1 to 3, a method of winding the front portion of the seat downward has been proposed. In these prior arts, the front part of the seat is formed as a deformation-permitting part, the front end of the deformation-permitting part is fixed to a horizontally long front bar, and the front-bar is moved back and forth to wind or extend the deformation-permitting part. doing. Side bars extending rearward are fixed to the left and right ends of the front bar, and the side bars are supported by a receiving member so as to be slidable back and forth.

Japanese Patent Publication No. 07-77567 Utility Model Registration No. 3076862 Special table 2010-516433

  As an operation method for adjusting the front / rear length of the seat, a person grasps the front end of the seat with his / her hand and pushes / pulls forward / backward, or moves the sidebar back and forth with a separate operation tool. However, when the person is seated, the body pressure is applied to the sidebar, making it difficult to adjust the front and back length while sitting, so the waist was lifted when changing the front and back length of the seat. Therefore, there is a problem that adjustment of the length of the seat (depth adjustment) is troublesome.

  In addition, since the seat supports the body of the person who is seated, the seat should have a high support strength throughout, but conventionally, the front end of the deformable portion is only supported by the front bar. Therefore, it can be said that the support strength and support stability of the body are not necessarily sufficient. In addition, the thigh may be strongly stretched against the front end of the seat while seated, but in the conventional structure where the front end of the seat (the front end of the deformation-allowing portion) is fixed to the funnel, the thigh is There was also a possibility that the sitting comfort would be worsened due to the phenomenon of pushing up.

  The present invention has been made in view of such a current situation, and in a seat portion that can adjust the front and rear length (front end depth) of the seat, the support strength, the seating comfort, the ease of adjusting the front and rear length, and the like are intended. It is intended.

  The present invention includes a seat and a chair, and the seat includes a seat inner shell having a cushion and a seat outer shell that supports the seat inner shell from below. The basic configuration is such that the front-rear length can be adjusted by forming the front portion as a deformation-permitting portion that can be wound downward.

  And in invention of Claim 1, under the said basic composition, the said seat outer shell has a fixed outer shell which comprises at least the back side half of the said fixed outer shell, and the part protruded in front of the said fixed outer shell It is composed of a slide outer shell, the slide outer shell is attached to the fixed outer shell so as to freely move back and forth, and by connecting the front end of the seat inner shell to the front end of the slide outer shell, The front portion of the seat inner shell can be wound downward.

  Further, the slide outer shell has a planar spread so that the seat inner shell can be supported over a wide range, and the seat inner body is mainly supported by the stationary outer shell while the body pressure of the seated person is supported by the seat outer shell. The downward pressing force of the shell is set so as not to be applied to the slide outer shell.

  The invention of claim 2 embodies claim 1, wherein in the invention, the slide outer shell protrudes backward from the left and right side portions of the base portion and a base portion having the same lateral width as the fixed outer shell. The base portion and the arm portion overlap with the fixed outer shell from above, and the base portion can be slid forward and backward by the first guide means so that it cannot be pulled upward from the fixed outer shell. On the other hand, the arm portion is connected to the fixed outer shell by the second guide means so as not to be able to come out upward and slide back and forth.

  The invention of claim 3 embodies claim 1 or 2, wherein the fixed outer shell is formed in an upwardly concave shape, while the seat inner shell is made of synthetic resin and is behind the deformation allowing portion. The seat inner shell can be deformed by extending downward with the body pressure of the seated person, and the seat inner shell is attached to the left and right side support portions of the fixed outer shell in a front view so that the seat inner shell is attached to the seated person's body. The body pressure of the seated person can be reduced by placing the arm part of the slide outer shell outside the left and right side support parts of the fixed outer shell. The arm portion of the slide outer shell is prevented or suppressed from passing through the seat inner shell.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the deformation permitting portion of the seat inner shell has left and right laterally elongated slits formed in multiple front and rear rows, and is divided into front and rear with the slit interposed therebetween. By connecting these portions with a bridge portion that is convex in a side view, the deformation allowing portion is allowed to greatly extend and deform in the front-rear direction. The present invention also includes a chair, and the chair also includes a chair having a seat portion described in any one of claims 1 to 4.

  In the present invention, the longitudinal length of the seat changes by moving the slide outer back and forth, but since the fixed outer shell constitutes at least the rear half, for example, the seat was seated in a normal sitting state with the back against the backrest. Most of the human body pressure can be supported by a fixed outer shell. Since the slide outer shell is not pressed from above by the seat inner shell while the body pressure of the seated person is mainly supported by the fixed outer shell, a load is applied to the slide outer shell when a person normally sits down. There is little or no effect, and as a result, the longitudinal length of the seat can be adjusted while seated. For this reason, it is excellent in operability and user-friendly.

  Further, in the present invention, the slide outer shell has a wide area, so that even if the body pressure of the seated person acts on the front part of the seat, the seat inner shell does not deform excessively. Firmly supported. For this reason, it is excellent in support strength. In addition, when the seat inner shell sinks due to the body pressure of the seated person and hits the slide outer shell, the seat inner shell is supported by a wide area by the slide outer shell, so the seat inner shell is greatly deformed locally. Therefore, there is no problem that gives a feeling of pushing up to a person's thigh, so that the sitting comfort is excellent. In other words, the longitudinal length of the seat can be adjusted without sacrificing strength or sitting comfort.

  Various structures for slidably attaching the slide outer shell to the fixed outer shell can be adopted. However, if the structure of claim 2 is adopted, the base and the arm are connected to the fixed outer shell. The integrity of the fixed outer shell and the slide outer shell can be improved. Moreover, since there are many guide means, there exists an advantage which can eliminate a twist and can make the movement of a slide outer shell smooth.

  If the structure of Claim 3 is employ | adopted, since a seat inner shell will deform | transform so that it may sink with a seated person's body pressure, it is excellent in cushioning property and fitting property. Moreover, although the part located outside the side support part in the seat inner shell becomes floating easily when a person is seated, in claim 3, the arm part of the slide outer shell is outside the side support part of the fixed outer shell. Therefore, it is possible to accurately prevent the arm portion of the slide outer shell from being pressed by the seat inner shell. As a result, the operability of the forward / backward movement of the slide outer shell (adjustment of the longitudinal length of the seat) can be improved accurately.

  If the structure of Claim 4 is employ | adopted, since the deformation | transformation permission part of a seat inner shell will extend and deform in the front-back direction, it can implement | achieve easily and deform | transform the said deformation | transformation permission part so that it may fold. That is, when the slide outer shell is retracted to bend and deform the deformable portion, it can be folded back (involved) with a large curvature, so the resistance to folding (winding) is small, and therefore the length of the seat Adjustment can be done with light force.

The chair which concerns on embodiment is shown, (A) is the perspective view seen from the front, (B) is the perspective view seen from back, (C) is the isolation | separation side view. It is the isolation | separation perspective view which looked at the seat and its support mechanism from the top. It is the isolation | separation perspective view which looked at the seat and the intermediate metal fitting from the lower part. (A) is the isolation | separation perspective view in the state which turned the seat upside down, (B) is the isolation | separation perspective view of a seat outer shell and an intermediate metal fitting, (C) is the partial expansion perspective view of a seat outer shell. It is a separation perspective view of a seat. It is a separation perspective view of a seat. (A) is the top view of the principal part, (B) is the cross-sectional perspective view which looked at a part of (A) from the side. 7A is a cross-sectional view taken along the line VIIIA-VIIIA of FIG. 7A, FIG. 7B is a cross-sectional perspective view of FIG. 7A viewed from the direction B-B, and FIG. It is the cross-sectional perspective view seen from -C view direction. (A) is a cross-sectional view taken along the line IXA-IXA in FIG. 7 (A), and (B) is a cross-sectional view taken along the line IXB-IXB in FIG. 7 (A). 7A is a sectional perspective view of FIG. 7A viewed from the XA-XA viewing direction, FIG. 7A is a sectional perspective view of FIG. 7A viewed from the XB-XB viewing direction, and FIG. It is the cross-sectional perspective view which looked at (A) from the XC-XC viewing direction. (A) is the perspective view which looked at the part by which the operation lever for seat adjustment was mounted | worn from the top, (B) is the isolation | separation perspective view of a seat adjustment operation lever and a seat outer shell. (A) is a separated perspective view of the seat adjusting operation lever and the slide outer shell, (B) is a separated perspective view of the seat adjusting operation lever, and (C) is a top view of the portion where the seat adjusting operation lever is mounted. It is the perspective view seen from.

  Next, an embodiment of the present invention will be described with reference to the drawings. In the following description, the words “front and rear” and “left and right” are used to specify the direction, but the words on the front and rear and right and left are based on the person who is seated. The front view direction is the direction facing the seated person, and therefore the left and right in the front view are opposite to the left and right viewed from the seated person.

(1). Outline of chair First, an outline of the chair will be described mainly with reference to FIGS. This embodiment is applied to a swivel chair that is frequently used for office work and the like, and the chair is provided with a leg device displaying only the leg support 1 (see FIG. 1C) and the upper end of the leg support 1. It has a fixed base 2, a seat 3 disposed on the base 2, and a backrest 4 on which a seated person can lean. The base 2 is formed in a box shape opened upward. The planar view shape of the seat 3 is formed in a substantially rectangular shape with four corner portions rounded.

  For example, as shown in FIG. 2, an intermediate metal fitting (seat receiving metal fitting) 5 made of a metal plate is arranged on the base 2, and a resin seat outer shell 6 is attached to the intermediate metal fitting 5. It is also possible to connect the seat outer shell 6 to the base 2 without using the intermediate metal fitting 5.

  The seat 3 includes a resin seat inner shell (seat plate) 7 and a seat cushion material 8 disposed on the upper surface thereof. The seat cushion material 8 is covered with a skin material (not shown) such as a cloth. Covered from. The seat outer shell 6 is composed of a fixed outer shell 9 fixed to the intermediate metal fitting 5 and a slide outer shell 10 protruding in front thereof. The slide outer shell 10 is attached to the fixed outer shell 9 so as to be movable back and forth. ing.

  Further, a portion closer to the front side of the seat inner shell 7 is a deformation allowing portion 7 c that easily bends and deforms downward in a side view, and the front end portion of the deformation allowing portion 7 c is connected to the front end portion of the slide outer shell 10. ing. For this reason, when the slide outer shell 10 is slid back and forth, the deformation allowing portion 7a of the seat inner shell 7 extends forward or is wound downward. Thereby, the front-rear length of the seat 3 (or the front end position of the seat 3) can be adjusted.

  For example, as shown in FIG. 2, a first back frame 11 is connected to the base 2 so as to be able to tilt backward, and a second back frame 12 positioned behind the first back frame 11 is fixed to the first back frame 11. The backrest 4 is attached to the second back frame 12. For example, as shown in FIG. 2, the first back frame 11 has an arm portion 11 a extending forward at an outer position of the base 2, and the front end portion of the left and right arm portions 11 a is a base with a horizontally long first shaft 13. 2 is connected. Accordingly, the backrest 4 tilts around the axis of the first shaft 13.

  The chair according to the present embodiment is a synchro-type chair in which the seat 3 is retracted in conjunction with the backward tilt of the backrest 4 and, as can be understood from FIG. 2, the rear portion of the intermediate metal fitting 5 is connected to a bracket portion 15 projecting upward from the first back frame 11 by a horizontally elongated second shaft 16. Inside the base 2, a reaction force unit that elastically supports the back tilt of the backrest 4 and a gas cylinder for locking that controls the tilt of the backrest 4 are arranged. The direct relationship with the present invention is as follows. Details are omitted here.

(2) Relationship between the intermediate bracket and the seat outer shell The details of each part will be described below mainly with reference to the drawings from FIG. First, the relationship between the intermediate | middle metal fitting 5 and the seat outer shell 6 is demonstrated. For example, as shown in FIG. 3, the intermediate metal fitting 5 has a shape that is substantially close to a square in plan view, and has an upper plate 5a and left and right side plates 5b. The second shaft 16 penetrates the side plate 5b.

  As shown in FIG. 4, the fixed outer shell 9 is formed with a recess 18 that fits perfectly into the intermediate metal fitting 5. A pair of left and right forward stopper portions 19 are provided at the front end of the upper surface of the intermediate metal fitting 5, while the forward stopper portion 19 is fitted to the front end portion of the recess 18 in the fixed outer shell 9 from behind. The part 20 is formed integrally.

  Further, a left and right laterally long rectangular lock hole 21 is formed in the rear end portion of the upper plate 5 a in the intermediate metal fitting 5, while a lock that fits in the lock hole 21 in the rear end portion of the recess 18 in the fixed outer shell 9. The claw 22 is projected downward. The lock claw 22 is fitted into the lock hole 21 after being elastically deformed. Thereby, the fixed outer shell 9 is attached to the intermediate metal fitting 5 so as not to be detached. That is, the fixed outer shell 9 can be attached to the intermediate metal fitting 5 in one touch. Since the second shaft 16 enters the recess 18 of the fixed outer shell 9, it can be prevented from coming off without using a member such as a snap ring.

(3). Seat Inner Shell The seat inner shell 7 is a molded product made of a resin such as PP. For example, as clearly shown in FIGS. The rear support portion 7b positioned behind the main support portion 7a and the above-described deformation allowing portion 7c positioned in front of the main support portion 7a. Roughly speaking, the main support portion 7a occupies a little less than half of the longitudinal length, and the rear support portion 7b and the deformation allowance portion 7c occupy a range of about a quarter or more.

  The seat inner shell 7 is gently curved in an upwardly concave shape when viewed from the front, and is gently inclined so that the height becomes higher as the rear support portion 7b goes rearward in the longitudinal side view. In addition, a group of ribs extending vertically and horizontally are provided to protrude upward on the upper surface of the rear support portion 7b in order to increase rigidity.

  The main support portion 7a of the seat inner shell 7 includes a group of center slits 24 that are located at the left and right intermediate portions and are long in the front-rear direction, a group of intermediate slits 25 that are formed in an arc shape on the outside, and outside the intermediate slits 25. A group of side slits 26 that are positioned and extend long in the front-rear direction are formed. In addition, the left and right side portions of the main support portion 7a and the rear support portion 7b are connected to each other, and left and right laterally elongated grooves 27 are formed between them. For this reason, the main support portion 7a is allowed to extend downward and deform with the body pressure of the seated person.

  For example, as shown in FIGS. 6 and 7, horizontally long front slits 28 are formed in the deformation permitting portion 7c of the seat inner shell 7 in three rows in the left-right direction and in multiple rows (multistage) in the front-rear direction. Due to the presence of the group 28, the deformation allowing portion 7c is allowed to be deformed from a posture extending linearly in a side view to a posture folded back and folded.

  A laterally inverted U-shaped bridge portion 29 is formed at the left and right intermediate portion and the left and right end portions of the deformation allowing portion 7c, and the strip-like portion divided forward and backward across the front slit 28 is a bridge portion. 29 is connected. Due to the presence of the inverted U-shaped bridge portion 29, the deformation allowing portion 7c can be greatly stretched in the front-rear direction, so that the entanglement can be reliably performed without resistance. Therefore, the bridge portion 29 can also be called an extension portion. In addition, the front slit 28 located on the left and right outer side opens to the side of the deformation allowing portion 7c.

  As shown in FIG. 3, the portion of the cushion 8 that overlaps the deformation allowing portion 7 c is slightly thinner than the other portions, and thus the front portion of the cushion 8 is easily deformed. Although the cushion 8 of this embodiment is a molded product, a cut product of a sheet material can also be used.

(4). Seat outer shell The fixed outer shell 9 and the slide outer shell 10 constituting the seat outer shell 6 are molded products made of resin such as PP. For example, as can be understood from FIG. 8A, the front end of the fixed outer shell 9 extends to the rear portion of the deformation allowing portion 7c of the seat inner shell 7 (note that the slit is omitted in FIG. 8A). ). That is, the fixed outer shell 9 overlaps the entire main support portion 7a and rear support portion 7b of the seat inner shell 7 in plan view, and partially overlaps the rear portion of the deformation allowing portion 7c of the seat inner shell 7. It has become.

  For example, as can be understood from FIG. 6, the fixed outer shell 9 is gently curved so as to be concave upward at the front, and the rear portion is inclined backward. A large number of ribs are formed on the upper surface of the fixed outer shell 9 in order to increase the rigidity. The fixed outer shell 9 is formed with a hole 30 that allows the main support portion 7a of the seat inner shell 7 to sink greatly.

  For example, as shown in FIG. 6, the slide outer shell 10 includes a base portion 10 a having substantially the same lateral width as the fixed outer shell 9 and a planar spread, and arm portions 10 b protruding rearward from the left and right side portions of the base portion 10 a. Have. Even when the base portion 10a is fully advanced, the rear portion always overlaps with the fixed outer shell 9 from above, and when it is fully retracted, almost the entire base portion 10a overlaps with the fixed outer shell 9. The arm portion 10b always overlaps the fixed outer shell 9 from above.

  The base 10a of the slide outer shell 10 is basically plate-shaped (may be lattice-shaped), and reinforcing ribs are formed on the upper surface so as to extend vertically and horizontally. Then, as shown in FIG. 6 and FIG. 9 (A), a plurality of first guide projections 31 having a head-view T-shape projecting from the front end portion of the fixed outer shell 9 are provided in a protruding manner. A longitudinal guide long hole 32 into which the first guide protrusion 31 cannot be removed and is movably moved back and forth is formed in the base portion 10a. The first guide protrusion 31 and the guide slot 32 constitute the first guide means described in the claims. Four first guide protrusions 31 and four guide holes 32 are formed so as to jump out in the left-right direction, but the number and position can be arbitrarily set.

  As can be understood from FIG. 6, the rear end portion of each guide slot 32 is a wide portion 32 a into which the head of the first guide protrusion 31 is fitted and detached. For this reason, by inserting the guide long hole 32 into the first guide protrusion 31 from the location of the wide width portion 32a and then sliding the slide outer shell 10 backward, the base portion 10a of the slide outer shell 10 is held so as not to be detached.

  As shown in FIG. 9B (see also FIG. 6), the arm portion 10b of the slide outer shell 10 is formed with a crank-shaped guide groove 33 that is a crank shape that opens downward and upward in a front sectional view. On the other hand, the fixed outer shell 9 is integrally provided with a substantially inverted L-shaped second guide projection 34 that fits in the guide groove 33 so that it cannot be removed. The second guide protrusion 34 and the guide groove 33 constitute one example of second guide means described in the claims. The guide groove 33 forms a support portion 33a protruding leftward and rightward by shifting the downward opening position and the upward opening position to the left and right, while the second guide protrusion 34 is positioned on the support portion 33a. An inward flange portion 34a is formed. As shown in FIG. 12, the rear end portion of the guide groove 33 is a wide portion 33 b for allowing the second guide protrusion 34 to be fitted.

  As shown in FIG. 9, a narrow convex rail portion 35 is formed at the lower end of the arm portion 10 b, while the fixed outer shell 9 has a concave rail portion 36 into which the convex rail portion 35 is slidably fitted. The left and right positions of the slide outer shell 10 are regulated by the rail portions 35 and 36 being fitted to each other. The convex rail portion 35 extends to the vicinity of the front end of the fixed outer shell 9, and the concave rail portion 36 extends to the vicinity of the front end of the slide outer shell 10.

(5) Relationship between seat inner shell and seat outer shell The seat inner shell 7 is connected to both the fixed outer shell 9 and the slide outer shell 10 of the seat outer shell 6. This point will be described next.

  As shown in FIG. 6 and FIG. 10 (B), rail-shaped side support portions (side protrusions) 38 that are long in the front and rear directions are formed in a portion near the left and right side edges of the fixed outer shell 9 and substantially in the rear half. The support rib 39 of the seat inner shell 7 is placed on the side support portion 38. As shown in FIG. 10B, a horizontal step portion 40 is formed outside the support rib 39 in the main support portion 7 a of the seat inner shell 7, and slides below the step portion 40. The arm portion 10 b of the outer shell 10 is disposed, and an inward stopper piece 41 is formed on the inner wall portion of the stepped portion 40. The stopper piece 41 is surrounded from three sides by a punched hole 42 opened up and down.

  The protrusion 38 of the fixed outer shell 9 is integrally provided with a restraining piece 43 that covers the stopper piece 41 from above. That is, the left and right end portions of the main support portion 7a in the seat inner shell 7 are held so as not to move inwardly. Therefore, the main support portion 7a is deformed so as to sink downward due to the load of the seated person. Further, since the left and right side portions of the main support portion 7a are held by the side support portions 38 so as not to be lowered, the arm portion 10b of the slide outer shell 10 is the main support portion 7a of the seat inner shell 7 even when a person is seated. It will not be pushed downward. Accordingly, the arm portion 10b of the slide outer shell 10 can easily slide back and forth in the seated state.

  The punching hole 42 protrudes behind the stopper piece 41. For this reason, the restraining piece 43 is removed from the punching hole 42 by placing the seat inner shell 7 slightly in front of the predetermined position and then overlapping the fixed outer shell 9. Can be fitted into the rear. In this state, when the seat inner shell 7 is shifted backward, the restraining piece 43 is positioned on the stopper piece 41.

  As shown in FIG. 10 (C), support pieces 44 protruding inwardly toward the arm portion 10b of the slide outer shell 10 are separated in the front-rear direction at both left and right ends of the main support portion 7a in the seat inner shell 7. Are formed. Although the support piece 44 is for attaching a skin material, it can also hold | maintain the support function of the seat inner shell 7. FIG. In addition, you may provide separately the side rib which prevents that the right and left edge part of the seat inner shell 7 shifts | shifts inwardly.

  As shown in FIG. 10A, the left and right rear portions of the fixed outer shell 9 are provided with hook-shaped rear engagement claws 45 formed with an upper portion forked, while the rear support portion 7b of the seat inner shell 7 has A rear engagement hole 46 is formed to be engaged with the rear engagement claw 45 from above. The rear engagement hole 46 is also engaged with the rear engagement claw 45 by shifting the seat inner shell 7 to the fixed outer shell 9 and then shifting it backward.

  As shown in FIG. 8D, a center locking piece 47 that protrudes downward with the front end as a free end is provided at the left and right intermediate portions of the rear support portion 7b in the seat inner shell 7, while the fixed outer shell. 9, a center receiving portion 48 into which the center locking piece 47 is fitted so as not to move forward is formed as a recess. The center locking piece 47 is surrounded by slits on three sides except for the root, and therefore the center locking piece 47 can be rotated up and down with the root as a fulcrum. A hole 49 is opened in the center receiving portion 48. Therefore, the center locking piece 47 can be detached from the center receiving portion 48 by pushing upward with a tool such as a screwdriver.

  As shown in FIG. 7, a side engagement portion 49 having a square shape in plan view is formed on the left and right outer sides of the center receiving portion 48 in the fixed outer shell 9, and the seat inner shell 7 is formed on the side engagement portion 49. Side engagement holes 50 provided in the rear support portion 7b are fitted. Thereby, the backward movement of the seat inner shell 7 is restricted. Eventually, the seat inner shell 7 is held by the center locking piece 47 and the side engaging portion 49 so that it cannot be displaced back and forth.

  A lock claw 22 (see FIG. 4) for attaching to the intermediate metal fitting 5 is provided at the side engagement portion 49. The lock claw 22 is provided with a finger hook piece 22a protruding upward. For this reason, the lock claw 22 can be disengaged from the intermediate fitting 5 by removing the seat 3 and pulling the finger-hook piece 22a forward.

  The connection structure of the front end portion of the seat inner shell 7 is shown in FIG. In other words, the support shafts 54 are integrally formed via the left and right downward bracket part pieces 53 at two positions on both the left and right sides of the center line of the deformation allowing portion 7c of the seat inner shell 7, while the slide outer shell 10 A bearing portion 55 into which the support shaft 54 fits from above is integrally provided at the front end. The support shaft 54 and the bearing portion 55 can rotate relative to each other.

  Accordingly, when the slide outer shell 10 is retracted, the front end of the deformation allowing portion 7c is pulled backward, and therefore, the deformation allowing portion 7c is wound down in a state where it is folded back. Thereby, the front-end position (depth of a front end) can be adjusted by changing the front-end position of the seat 3. The number of arrangement positions of the pair of support shafts 64 and bearing portions 55 is not limited to two on the left and right, and the number and arrangement positions can be arbitrarily set, for example, at three positions of the intermediate portion and the left and right sides. Further, the support shaft 54 can be provided on the slide outer shell 10 and the bearing portion 55 can be provided on the deformation allowing portion of the seat inner shell 6, and other connecting means may be employed.

  As shown in FIG. 8C, a front stopper 56 protruding backward is provided at the front end of the deformation allowing portion 7c in the seat inner shell 7. This is for attaching a skin material covering the seat cushion 8.

(6). Seat length adjustment (depth adjustment) operation mechanism Next, an operation device for adjusting the front and rear seat lengths of the seat 3 will be described mainly with reference to FIGS. For example, as shown in FIG. 12B, the operating device includes a finger contact lever 58 that is mounted on the right side of the slide outer shell 10 so as to freely move back and forth, and a lock member 59 that slides left and right by the back and forth movement of the finger contact lever 58. And a spring (compression coil spring) 60 that urges the lock member 59 to the locked posture. The finger contact lever 58 and the lock member 59 are made of resin.

  As clearly shown in FIGS. 12 (A) and 12 (C), the lower surfaces of the left and right side portions of the slide outer shell 10 are inclined so as to be lowered toward the inside, and the bottom surface has a flat recess on the inclined lower surface. 61 is formed, and a finger contact lever 58 is disposed in the recess 61 so as to be movable back and forth. The finger rest lever 58 has an upper plate 58a that overlaps the bottom surface of the recess 61 and a knob 58b that protrudes downward from the upper plate 58a, and is exposed on the slide outer shell 10 on the upper plate 58a. A front-view T-shaped engagement protrusion 63 is integrally formed. The slide outer shell 10 is formed with a longitudinal mounting hole 64 in which the engaging projection 63 is fitted so that it cannot be removed. The front end of the attachment hole 64 is formed with a wide portion 64a into which the engagement protrusion 63 can be fitted and removed.

  The lock member 59 has a left and right longitudinal rod shape, and is slidably fitted in a left and right longitudinal guide groove 65 provided on the lower surface of the slide outer shell 10. The guide groove 65 and the recess 61 are integrally continuous. The guide groove 65 is formed in a state where the convex rail portion 35 is divided.

  As shown in FIG. 12B, the outer end of the lock member 59 facing the finger contact lever 58 is a U-shaped contact portion 59a in bottom view, while the finger contact lever 58 has a lock member. A recess 66 is formed to cover the contact portion 59a of 59 from below, and the inner side surface of the recess 66 is formed as a V-shaped inclined surface 66a in a bottom view. In other words, the inner surface of the recess 66 is formed with two front and rear inclined surfaces 66 a that are inclined so that the interval is widened toward the lock member 59.

  A groove 67 into which the spring 60 is fitted is formed on the upper surface of the lock member 59, and one end of the spring 60 is in contact with the inner side surface 65 a of the guide groove 65. Accordingly, the lock member 59 is urged outward (in a direction toward the finger contact lever 58). Since the recess 66 of the finger rest lever 58 is V-shaped, when no external force is applied to the finger rest lever 58, the lock member 59 is retracted outward and the contact portion 59a is the recess 66. It is fitted in a deep position and is held in a stable state. On the other hand, when the finger contact lever 58 is slid forward or backward, the lock member 59 moves forward inward by the guide action of the inclined surface 66a.

  A stopper protrusion 68 that protrudes downward toward the fixed outer shell 9 is integrally provided at the inner end of the lock member 59. On the other hand, the fixed outer shell 9 is provided with a stopper receiving portion 69 into which the stopper projection 68 is fitted and removed when the lock member 59 moves left and right. The stopper receiving portion 69 is configured by jumping inward ribs on the longitudinal longitudinal ribs 70 in the longitudinal direction, and in this embodiment, five stopper receiving portions 69 are formed side by side. Therefore, the longitudinal length of the seat 3 can be adjusted in five stages. The vertical rib 70 forming the stopper receiving portion 69 is integrally connected to the side support portion 38 on which the main support portion 7a and the rear support portion 7b of the seat inner shell 7 are placed. It is in a stepped state.

  For example, as shown in FIG. 3, finger contact protrusions 71 having the same shape as the slide type finger rest lever 58 are integrally formed at a position symmetrical to the slide type finger rest lever 58 in the slide outer shell 10. Yes. For this reason, the front-rear adjustment of the seat 3 can be performed smoothly without being twisted. It is also possible to provide the slide type finger rest lever 58 on both the left and right sides of the slide outer shell 10. When the slide-type finger contact lever 58 is provided on the left and right, the lock member 59 can be provided on the left and right. The lock member 59 is provided only on one side, and the one slide-type finger contact lever 58 is a dummy. It is also possible.

(7) Summary As described above, a seated person slides when the fingertip lever 58 and the finger contact protrusion 71 are moved back and forth by placing the fingertip on (or picking) the finger contact lever 58 and the finger contact protrusion 71. The outer shell 10 is moved back and forth, whereby the deformation allowing portion 7c of the seat inner shell 7 is entrained and deformed, and the position of the front end of the seat 3 (front and rear length of the seat 3) is adjusted. Can do.

  As described above, the left and right sides of the main support portion 7a of the seat inner shell 7 are held on the side support portions 38, so that the arm portion 10a of the slide outer shell 10 can be Since the body pressure does not act at all or hardly, it can be easily performed while the seat 3 is being seated. Although it is possible that the thigh of the seated person hits against the deformation allowable portion 7c of the seat inner shell 7, the deformation allowable portion 7c is merely stretched, entangled or deformed and does not move back and forth. Therefore, the fact that the thigh of the seated person is in contact with the seat inner shell 7 does not serve as resistance for the longitudinal adjustment of the seat 3.

  Now, when an operation lever is provided to adjust the seat back and forth and depth, for example, the lever is turned upward and then unlocked, and then the lever or seat is moved in either the front or back direction. ing. That is, when looking at the movement of a person's hand, there are two movements in different directions.

  On the other hand, in this embodiment, even if the finger contact lever 58 is moved in any direction, the lock member 59 is detached from the stopper receiving portion 69, and the slide outer shell 10 is moved back and forth as it is unlocked. Can do. Accordingly, when the person adjusts the depth of the seat 3, the lock is released by moving the finger rest lever 58 in a way that the slide outer shell 10 is desired to be moved. Can be done. Therefore, operability is good.

  In the present embodiment, since the base portion 10a of the slide outer shell 10 is basically plate-like, the deformation allowing portion 7c of the seat inner shell 7 can be supported in a wide range. For this reason, even if a person's thigh strongly hits the front part of the seat 3, there is no feeling of pushing up and it is excellent in sitting comfort though it is a retractable seat.

  As described above, in this embodiment, the slide outer shell 10 can be attached to the fixed outer shell 9 so as not to be detached by a procedure in which the slide outer shell 10 is overlapped with the fixed outer shell 9 and then moved backward. On the other hand, the support shaft 54 at the tip of the seat inner shell 7 is fitted into the bearing 55 of the slide outer shell 10 in a state where the slide outer shell 10 is held so as not to be separated upward from the fixed outer shell 9. For this reason, assembly of the seat outer shell 6 and attachment of the seat inner shell 7 can be performed easily (that is, the workability of assembling the chair is excellent).

  In this embodiment, since the slide outer shell 10 overlaps the fixed outer shell 9 from above, for example, even when body pressure is strongly applied to the front portion of the seat 3, the slide outer shell 10 is in close contact with the fixed outer shell 9. Act on. That is, as the body pressure is increased, the slide outer shell 10 tends to be integrated with the seat outer shell 9. For this reason, the slide outer shell 10 is not separated from the fixed outer shell 9 by human body pressure. Therefore, it is excellent in support strength and support stability.

  In the present embodiment, since the arm portion 10b of the slide outer shell 10 is disposed outside the side support portion 38, it is possible to accurately prevent the arm portion 10b from being pushed by the seat inner shell 7. That is, since the main support portion 7a of the seat inner shell 7 is placed on the side support portion 38, the portion of the seat inner shell 7 positioned outside the side support portion 38 tends to float upward due to the body pressure of the seated person. Therefore, the slide outer shell 10 can be prevented from being pressed by the seat inner shell 7 and the slide outer shell 10 can be moved back and forth easily.

  As in this embodiment, when the convex rail portion 35 provided at the lower end of the arm portion 10a and the concave rail portion 36 provided in the fixed outer shell 9 are fitted, the play of the slide outer shell 10 can be eliminated. It is preferable.

(8). Others The present invention can be embodied in various ways other than the above embodiment. For example, the application target is not limited to a movable swivel chair, but can also be applied to a fixed chair such as a theater chair. It is not always necessary to form slits as in the embodiment as a means for providing the deformation allowing portion on the seat inner shell, and it is possible to form a large number of folds or use a material that deforms as a whole. is there.

  The forms of the fixed outer shell and the slide outer shell constituting the seat outer shell can be variously embodied as necessary. For example, it is possible to provide three or more arm portions.

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

3 seat 4 backrest 5 intermediate bracket (seat receiving member)
6 seat outer shell 7 seat inner shell 7a main support portion 7b rear support portion 7c deformation allowance portion (front support portion)
DESCRIPTION OF SYMBOLS 8 Cushion 9 Fixed outer shell 10 Slide outer shell 10a Base part 10b Arm part 31 1st guide protrusion which comprises 1st guide means 32 Guide long hole which comprises 1st guide means 33 Guide groove which comprises 2nd guide means 34 1st 2nd guide protrusion 34 which comprises 2 guide means
38 Side support as an example of side support

Claims (5)

It has a seat inner shell with a cushion and a seat outer shell that supports the seat inner shell from below, and the front portion of the seat inner shell is formed as a deformation-permitting portion that can be wound downward. The seat is adjustable,
The seat outer shell is composed of a fixed outer shell that constitutes at least a rear half of the fixed outer shell, and a slide outer shell having a portion protruding in front of the fixed outer shell, It is attached to the fixed outer shell so that it can move back and forth, and the front end of the seat inner shell can be connected to the front end of the slide outer shell so that the front of the seat inner shell can be wound downward. In the tuned configuration,
The slide outer shell has a planar spread so that the seat inner shell can be supported over a wide range, and the body pressure of the seated person is mainly supported by the fixed outer shell, It is set so that the downward pressing force is hardly applied to the slide outer shell,
Seat for the chair. The slide outer shell has a base portion with a lateral width that is the same as that of the fixed outer shell, and arm portions that protrude rearward from the left and right side portions of the base portion. The base portion and the arm portion are the fixed outer shell. The base portion is overlapped with the shell from above, and the base portion is connected to the fixed outer shell by the first guide means so as not to be upwardly slidable, while the arm portion is fixed by the second guide means. It is connected to the outer shell so that it cannot slide upward and slid freely.
A seat for a chair according to claim 1. The fixed outer shell is formed in an upwardly concave shape, while the seat inner shell is made of synthetic resin, and the rear portion of the deformation-permitting portion can be extended and deformed downward by the body pressure of the seated person, By attaching the seat inner shell to the left and right side support parts of the fixed outer shell in front view, the seat inner shell is allowed to sink downward and deform by the body pressure of the seated person,
And by arranging the arm portion of the slide outer shell outside the left and right side support portions of the fixed outer shell, the body pressure of the seated person is applied to the arm portion of the slide outer shell via the seat inner shell. Prevent or suppress,
The seat part for chairs described in Claim 1 or 2. The seat inner shell has a deformable portion with laterally elongated slits in the front and rear, and the deformable portion is formed by connecting the front and rear separated portions with a bridge portion convex in a side view. It is allowed to greatly extend and deform the part in the front-rear direction,
The seat part for chairs in any one of Claims 1-3.   The chair which has the seat part in any one of Claims 1-4.

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