JP6135098B2 - Chair - Google Patents

Description

  The present invention relates to a chair capable of changing the depth of a seat.

  Conventionally, in a chair with a flat load receiving surface for receiving a load from a seated person, when the seated person changes the seating posture, the seated person is displaced forward. In order to suppress this inconvenience, various types in which a part of the seating surface is recessed downward have been developed.

  On the other hand, various chairs that can change the depth dimension of the seating surface have been developed (see, for example, Patent Document 1). However, the conventional one has a problem that, when the depth is changed, the load receiving surface also moves with the change, so that it is difficult to give an optimal fit to many people with different physiques.

JP 2003-284619 A

  An object of the present invention is to provide a chair capable of suppressing a forward shift of a seated person and improving a fit at the time of sitting.

The present invention employs the following configuration in order to solve the above-described problems. That is, the chair according to the present invention comprises a seat having depth changing means for changing the seating depth dimension, and the seat has a load receiving surface for receiving a load from a seated person on the upper surface side . An outer shell that is a hard member is provided, and the load receiving surface is formed with a seating reference point as a center, and an inclined portion that gradually rises forward is provided in front of the seating reference point. In addition, the inclination of the front part and the rear part of the inclined part is gentler than that of the inclined part, and the depth changing means is provided so that the inner shell can be slid in the front-rear direction on the outer shell, together is obtained to be able to be locked by moving to a desired slide position by the slide positioning mechanism the inner shell, the interlocking movement of said load bearing surface Characterized in that it is one that is configured so as to change the seating depth of the seat without Ukoto.

  Here, the “sitting position reference point” refers to a point set by design as the center of the seated person's load.

  Further, the “depth changing means” is any means as long as the load receiving surface remains in its original position and does not move in conjunction when changing the seating depth dimension of the seat. For example, a front-rear slide type in which the inner shell moves in the front-rear direction relative to the outer shell, a state in which the deformable front end of the shell is caught in the lower rear, and a forward extension A wrap-up type that can take the state of being moved, and a forward extension type in which the other shell provided at the front end of the one shell moves relative to one shell relative to the front-rear direction are also included.

  If this is the case, the presence of the inclined portion can suppress the forward displacement of the seated person, and even if the seating depth dimension is changed, the load receiving surface does not move in conjunction with it, so the physique is different. A feeling of fit at the time of sitting can be given to many people.

As one preferred embodiment, those prior Symbol inner shell, comprising a load transfer portion for supporting the load from the seated person on the load bearing surface at a site corresponding to the load bearing surface, the load transmission portion Is set more gently than the inclination of the inclined portion of the load receiving surface .

The load transmitting portion of the inner shell can be elastically deformed in the thickness direction until it receives a load from a seated person and comes into contact with the load receiving surface. When there is no load, the lower surface of the load transmitting portion and the load receiving surface Are preferably formed such that a space is formed at least partially between them and the size of the space changes as the inner shell slides back and forth .

  As a preferred embodiment of the load transmitting portion, there may be mentioned one in which a plurality of slits extending in the front-rear direction are formed at intervals in the left-right direction at a portion corresponding to the load receiving surface of the inner shell.

  As another aspect of the load transmitting portion of the inner shell, there is one that is made of a material that can be flexibly deformed and can always substantially adhere to the load receiving surface regardless of the sliding movement of the inner shell.

  As still another aspect of the load transmitting portion of the inner shell, a window-shaped one obtained by removing the entire region corresponding to the load receiving surface can be mentioned.

  Since this invention is the structure as mentioned above, while suppressing the shift | offset | difference to a front of a seated person, the chair which can improve the feeling of fitting at the time of sitting can be provided.

The external view of the chair which concerns on one Embodiment of this invention. The rear view of the chair which concerns on the embodiment. The center side sectional view of the chair concerning the embodiment. The expanded sectional view of the principal part of FIG. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. The disassembled perspective view of the chair which concerns on the same embodiment. The disassembled perspective view of the outer shell and inner shell of the seat of the embodiment. The exploded perspective view from the upper part of the seat of the embodiment. The exploded perspective view from the lower part centering on the seat of the embodiment. The bottom view which abbreviate | omits and shows the seat of the embodiment partially. BB sectional drawing of FIG. Action explanatory drawing shown in the same cross section as FIG. The disassembled rear view which abbreviate | omits and shows the seat which concerns on the embodiment partially. The disassembled perspective view from the front which abbreviate | omits and shows the backrest and cover aggregate | assembly of the embodiment partially. The disassembled perspective view from the back centering on the backrest of the embodiment. The disassembled perspective view from the back centering on the backrest of the embodiment. The front view which shows the back shell and back back cover of the embodiment. The disassembled perspective view of the back shell and lumbar support device of the embodiment. The rear view which shows the principal part of the lumbar support apparatus of the embodiment. Action | operation explanatory drawing of the depth change means of the embodiment. Action | operation explanatory drawing of the depth change means of the embodiment. Action | operation explanatory drawing of the depth change means of the embodiment. Action | operation explanatory drawing of the depth change means of the embodiment. The disassembled perspective view of the outer shell and inner shell of the seat concerning the modification of this invention. The action explanatory view showing typically the seat concerning other modifications of the present invention. Explanatory drawing which shows typically the seat concerning the modification.

  Hereinafter, an embodiment in which the present invention is applied to a synchro tilt type office rotary chair C will be described with reference to the drawings.

  As shown in FIGS. 1 to 23, the chair C includes a leg 1, a support base 2 that is supported on the upper part of the leg 1 and can be turned horizontally, and a seat 3 disposed on the support base 2. And a back support rod 4 provided on the support base 2 so as to be able to tilt backward, and a backrest 5 attached to the back support rod 4.

<Legs>
As shown in FIGS. 1 to 6, the leg 1 includes a leg blade type leg base 11 having casters 13, and a leg column 12 erected at the center of the leg base 11. The leg strut 12 is a normal one mainly composed of a gas spring, and the support base 2 is attached to the upper end of the leg strut 12.

<Support base>
As shown in FIGS. 1 to 6, 9, and 15, the support base 2 is supported by the legs 1 so as to be horizontally turnable and vertically movable, and is attached to the leg support 12. A housing 20, a main shaft 21 for supporting the backrest that penetrates the housing 20, and a tilt (not shown) that applies a force to the main shaft 21 to generate an elastic repulsive force with respect to the backward tilting operation of the backrest 5. And a reaction force generation mechanism. The tilt reaction force generation mechanism is configured to be able to apply an elastic repulsion force in the rotational direction to the main shaft 21 using a coil spring, a gas spring, or the like (not shown). Is omitted.

<Za>
As shown in FIGS. 1 to 13, the seat 3 includes an outer shell 31, an inner shell 32 disposed on the outer shell 31 through a slide guide mechanism 33 so as to be slidable in the front-rear direction, A slide positioning mechanism 34 for moving and locking the inner shell 32 to a desired slide position, a cushion 35 disposed on the inner shell 32, and a lower surface 326 c of the peripheral edge 326 of the cushion 35 and the inner shell 32. A covered seat skin material 36 is provided.

  As shown in FIGS. 2 to 9, 11 to 13, and 20 to 23, the outer shell 31 has a load receiving surface P <b> 3 that receives a load from a seated person on the upper surface 31 c side. The outer shell 31 is different in the form of the upper surface 31c between the first half area 31a and the second half area 31b. The outer shell 31 includes an outer shell main body 311, the vertical ribs 312, horizontal ribs 313, and oblique ribs 314 projecting from the upper surface 311 a of the outer shell main body 311, and the rear half region of the lower surface 311 b of the outer shell main body 311. A rear half central portion 315 having a surrounding wall 315a that protrudes toward the upper surface 311a of the outer shell main body 311 and a ceiling wall 315c that closes the protruding end 315b of the surrounding wall 315a. It is provided and is integrally molded using a hard synthetic resin. Downward vertical ribs 315f and downward horizontal ribs 315g protrude from the lower surface 315e of the top wall 315c of the rear half central portion 315. The protruding end surfaces 312a, 313a, and 314a of the vertical rib 312, the horizontal rib 313, and the diagonal rib 314, and the upper surface 315d of the top wall 315c of the rear half center portion 315 are configured to belong to one virtual common curved surface P2. Yes. The portion of the virtual common curved surface P2 belonging to the front half region 31a is curved so that each portion maintains a substantially constant height in the front-rear direction and gradually rises from the center portion toward the left and right side edges in the left-right direction. is there. The portion belonging to the latter half region 31b of the virtual common curved surface P2 is curved so that the front side gradually rises forward in the front-rear direction, and the other portions are maintained at a substantially constant height. In the left-right direction, it is curved so as to gradually rise from the center toward the left and right side edges. The load receiving surface P3 is set in a region excluding the peripheral edge of the latter half region 31b, and is set to belong to the virtual common curved surface P2. Specifically, the load receiving surface P3 is defined by the upper surface 315d of the top wall 315c and the protruding end surfaces 312a, 313a, and 314a of the vertical rib 312, the horizontal rib 313, and the diagonal rib 314 disposed on the left and right sides of the upper surface 315d. It is configured. The load receiving surface P3 is formed around the sitting reference point S1 set in the latter half region 31b, and includes an inclined portion P31 that gradually rises forward from the sitting reference point S1 to the front side. ing. By providing the inclined portion P31, it is possible to suppress the forward displacement of the seated person and to improve the fit at the time of sitting. The first lever 23 provided under the outer shell 31 is for adjusting the reaction force so as to adjust the spring preload of the tilt reaction force generation mechanism provided in the support base 2. It has become. The second lever 24 is for adjusting the height position of the seat 3, and a wire (not shown) connected to the lever 24 is formed by a recess 312 b formed in the vertical rib 312 and a hole in the outer shell main body 311. It is led to the vicinity of the upper end of the leg column 12 of the leg 1 through 311c. Since the third lever 25 is used to adjust the angle of the backrest 5, a wire (not shown) connected to the lever 25 is formed on the concave portion 312 c formed on the vertical rib 312 and the ceiling wall 315 c of the rear central portion 315. Through the formed groove 315h, the gas is guided to a gas spring for adjusting a backrest angle (not shown) disposed below the outer shell 31. Since the connection structure of these wires is normal, description is abbreviate | omitted.

  As shown in FIGS. 3 to 12 and FIGS. 20 to 23, the inner shell 32 transmits a load for causing a load corresponding to the load receiving surface P3 to be carried on the load receiving surface P3. An inner shell main body 321 having a shell shape having a step 325 having a height at the peripheral edge 326 side in the vicinity of the peripheral edge, and an upper surface 326a of the peripheral edge 326 of the inner shell main body 321 are provided. The ribs 326b are formed integrally with an elastically deformable synthetic resin. The peripheral edge portion 326 is wrapped by the outer edge 364 of the seat covering material 36, and has an upward wall 326d extending upward at the outermost edge. A region 327 surrounded by the step portion 325 of the inner shell main body 321 is slidable on the protruding end surfaces 312 a, 313 a, and 314 a of the vertical rib 312, the horizontal rib 313, and the diagonal rib 314 in the front half region 31 a of the outer shell 31. Slidable on the first half shell portion 327a that can be in close contact with, the projecting end faces 312a, 313a, and 314a of the rear rib 311, the lateral rib 313, and the oblique rib 314 and the upper surface 315d of the top wall 315c. A rear end shell portion 327b that can be in close contact with the rear end shell portion 327b, and an intermediate shell portion 327c that smoothly connects the front edge of the rear end shell portion 327b to the rear edge of the front half shell portion 327a. The intermediate shell portion 327c is provided with the load transmission portion 327d. The load transmitting portion 327d is formed by forming a plurality of slits 327g extending in the front-rear direction in the intermediate shell portion 327c with a space in the left-right direction. In the no-load state, the lower surface of the load transmitting portion 327d is formed. A space 327f is formed between 327e and the load receiving surface P3. The load transmitting portion 327d can be elastically deformed relatively easily in the thickness direction due to the presence of the slit 327g. When the load from the seated person is received, the load transmitting portion 327d is elastically deformed downward and the outer shell 31 is elastically deformed. It is comprised so that it may contact | abut to the load receiving surface P3. That is, the load from the seated person is finally received by the load receiving surface P3 of the outer shell 31 through the load transmitting portion 327d.

  The inner shell 32 is disposed on the outer shell 31 via the slide guide mechanism 33 so as to be slidable in the front-rear direction within a predetermined range, and is not accompanied by an interlocking transition of the load receiving surface P3. The seating depth dimension of the seat 3 can be changed. That is, by sliding the inner shell 32 with respect to the outer shell 31, the seating depth dimension of the seat 3 can be changed. However, since the load receiving surface P3 is provided on the outer shell 31, It does not move in conjunction with the sliding movement of the inner shell 32.

  As shown in FIGS. 6 to 13, the slide guide mechanism 33 is formed at a plurality of locations on the inner shell 32 and extends in the front-rear direction, and is slidably inserted into each of the guide slits 322 and has an upper end. A plurality of sliders 331 having retaining heads 332 slidably contacting the upper surface 32a of the inner shell 32, and a plurality of slider mounting portions 31e provided on the outer shell 31 to fix the lower end portions 333 of the sliders 331. It is equipped with. More specifically, the guide slits 322 are formed in the vicinity of the four corners of the inner shell 32, and a head that surrounds the retaining head 332 of the slider 331 around each guide slit 322. Protective ribs 323 are provided in a protruding manner. The protruding end surface 323a of each head protecting rib 323 is set to belong to the virtual common curved surface P2. Further, the upper surface 332 a of the retaining head 332 of each slider 331 is inclined so as to be accommodated in the head protecting rib 323. Each of the sliders 331 has a prismatic shape that can slide along the corresponding guide slit 322, and has a screw hole (not shown) on the lower end surface 334. Each of the slider attachment portions 31e is formed in the vicinity of the four corners of the outer shell 31, and has a bottomed rectangular tube shape with which the lower end portion 333 of the slider 331 can be fitted from above. . A screw insertion hole (not shown) through which a screw 31g can be inserted from the lower surface 31d side of the outer shell 31 is formed at the bottom 31f of each slider mounting portion 31e. The screw 31g is inserted into the screw hole 311c. Each slider 331 is fixed to the outer shell 31 by being screwed to the outer shell 31. 11 and 12, the slider 331 is indicated by a two-dot chain line.

  The inner shell 32 that is guided by the slide guide mechanism 33 having the above configuration and slides in the front-rear direction can be positioned and locked at a desired slide position by the slide positioning mechanism 34.

  As shown in FIGS. 6 to 13, the slide positioning mechanism 34 includes an operation member 341 that can move up and down between the lower lock position (D) and the upper lock release position (U), and the sliding movement of the inner shell 32. Accordingly, a plurality of positioning engaging portions 31r selectively corresponding to the operation member 341 are provided. In the slide positioning mechanism 34, the inner shell 32 is prohibited from sliding while the operation member 341 is lowered to the lower lock position (D) and engaged with the corresponding engagement portion 31 r, and the operation member 341 is moved. In this state, the engagement with the engaging portion 31r is released while the upper shell is released to the upper unlocking position (U), and the sliding movement of the inner shell 32 is allowed. An operation end 349 of the operation member 341 protrudes toward the lower surface 31d side of the outer shell 31, and a contact surface that locks the operation member 341 on the outer shell 31 at the upper lock release position (U). 31m is provided. The operating member 341 is an independent part that is separate from both the outer shell 31 and the inner shell 32, and is in a lower locked position (by a resilient repulsive force of a cushion 35 disposed on the inner shell 32. D) elastically biased in the direction.

  More specifically, the operating member 341 is inserted through the holding portion 324 of the inner shell 32 so as to be movable up and down, and the lower end side is passed through a slit 31 h provided in the outer shell 31 and extending in the front-rear direction. An operation member main body 343 protruding toward the lower surface 31d side, a thin plate-shaped head portion 344 provided at the upper end of the operation member main body 343 and contacting the lower surface 35b of the cushion 35, and an intermediate portion of the operation member main body 343 And a locking claw 345 that selectively engages one of a plurality of engaging portions 31r provided on the outer shell 31, and a lower end of the operating member main body 343 that contacts the contact surface 31m. A retaining projection 346 and a screw 348 are attached to the lower end of the operation member main body 343 so as to hold the retaining projection 346. Vignetting is obtained a push button 347 constituting the operation end 349. The contact surface 31m is formed along the opening end of the slit 31h on the lower surface 31d of the outer shell 31, and the upward surface 346a of the retaining member 341 of the operating member 341 and the pushing surface 346a are pushed on the contact surface 31m. The upper surface 347a of the button 347 is brought into contact with the inner shell 32 and can be slid back and forth. In other words, the operation member 341 is provided at a position where the operation member 341 can be operated with a finger placed on the upper surface side of the seat 3, and the operation member 341 is maintained while the finger is placed on the seat 3. By operating the push button 347 of the 341, the main part of the seat 3 including the operation member 341 can be moved with respect to the outer shell 31, and the seating depth dimension of the seat 3 can be changed. . In other words, the operation of pushing the push button 347 with the finger becomes the disengagement operation as it is, and the upward surface 346a of the retaining projection 346 and the upward surface 347a of the push button 347 in the disengaged state. The inner shell 32 can be slid back and forth while sliding in contact with the contact surface 31m. The reason why the push button 347 is brought into contact with the contact surface 31m is to keep the operating range of the operation member 341 constant, to prevent excessive stress from acting on each part, and to improve the feeling of operation. The inner shell 32 is slid back and forth while the push button 347 is in sliding contact with the contact surface 31m, as described above, while maintaining the state where the finger is put on the upper surface of the seat 3 as described above. This is because the seating depth dimension can be changed by operating the push button 347 of 341.

  In addition, as shown in FIGS. 7 to 9, notches 324a and 31k for allowing the retaining projection 346 to pass therethrough are provided on the outside of the holding portion 324 and on the outside of the front end portion of the slit 31h, respectively. . The notch 324a provided on the outside of the holding portion 324 and the notch 31k provided on the outside of the front end of the slit 31h are positioned so as to coincide with each other when the inner shell 32 is moved forward most. Only in this state, the operation member 341 can be attached to the inner shell 32 and the outer shell 31. The inside of the holding portion 324 is integrated with a head protecting rib 323 of a guide slit 322 disposed on the left front side of the seat 3 via a connecting rib 324b. That is, the holding portion 324 is disposed adjacent to one of the guide slits 322.

  As shown in FIGS. 3 to 6 and FIGS. 8 to 12, the cushion 35 is, for example, a non-woven fabric stuck on the lower surface 35 b of molded urethane, and is placed on the upper surface 32 a of the inner shell 32. It is wrapped with the seat skin material 36 together with the peripheral edge portion 326 of the inner shell 32.

  As shown in FIGS. 1 to 5 and FIGS. 10 to 12, the seat skin material 36 includes a skin material body 361 having a flat bag shape that opens downward, and a bag stitch formed on the opening edge of the skin material body 361. A portion 362 and a string 362 a inserted through the bag stitch portion 362 are provided. The skin material main body 361 is formed by stitching a plurality of types of upholstery fabrics 361a and 361b having different elongation characteristics via a mim 363 protruding to the outer surface. Specifically, the skin material main body 361 is obtained by stitching a first tension fabric 361 a that is relatively thick and difficult to stretch, and a second tension fabric 361 b that is relatively thin and rich in elasticity via a mim 363. It is. In addition, as an element related to the difference in stretch characteristics of the tension fabric, there are a difference in thickness, a difference in material, and a structural difference such as a woven fabric and a knitted fabric. The first upholstery 361a is mainly provided at a position that constitutes the seating surface P1, and covers the upper surface 35a and the front surface 35c of the cushion 35. The second upholstery 361b is provided in a region other than the seating surface P1, and covers the side surface 35d, the back surface 35e of the cushion 35, and the lower surface 326c of the peripheral edge 326 of the inner shell 32. The bag sewing portion 362 is brought into contact with the peripheral portion 326 lower surface 326c side of the inner shell 32 by being squeezed with the string 362a, and the inner shell 32 is attached to the outer shell 31 in a state where the inner shell 32 is attached. It fits in the gap between the outer shell 31. The inner shell 32 described above is directed from the center to the periphery due to the presence of the upright wall 325a that forms the stepped portion 325 and the upward wall 326d that is provided at the outermost edge and extends upward. Accordingly, it gradually extends upward. In other words, the inner shell 32 has a shape in a plan view, and the shape in the vicinity of the peripheral edge portion 326 used for a seat walnut stretched by tightening the seat covering material 36 is formed at the outermost edge. It keeps going up step by step. The bag stitch portion 362 of the seat cover material 36 is disposed along the outer side of the step portion 325 forming a step on the lower surface of the inner shell 32, and the bag stitch portion 362 extends from the lower surface of the inner shell 32. This prevents the inner shell 32 from interfering with the sliding operation. That is, a step is formed on the lower surface of the inner shell 32 inside and outside the step portion 325 so that the outer side is higher than the inner side. By arranging the bag sewing portion 362 outside the step, this step is performed. It can prevent that the bag sewing part 362 protrudes from the lower surface of the inner shell 32 to the outer shell 31 side. In addition, in FIGS. 3-5, FIG.11, and FIG.12, the seat skin material 36 is shown with the dashed-two dotted line.

<Back support>
As shown in FIGS. 3, 4, 6, 9, 15, and 16, the back support rod 4 includes a back support rod main body 41 made of thick steel plates and the like, and a back support rod main body 41. A shaft 42 for a tilt reaction force generating mechanism installed between the base end portions 41 a of the heel body 41, a distal end connecting member 43 that rigidly connects the distal ends of the back support ridge body 41, and the back support ridge body 41 A pair of left and right mounting plates 44 extending inwardly from the upper edge of the distal end portion 41c, and a rear shaft 45 for constituting the synchro-rocking mechanism 26 laid between the upper edges of the intermediate portion 41b of the back support rod main body 41 And is rotatably attached to the support base 2 via a main shaft 21 inserted through the shaft hole of the base end portion 41a. The intermediate portion 41b of the back support rod main body 41 is provided with a cover mounting hole 41d and a cover positioning projection 41e. A plurality of bolt insertion holes 44a are formed in the mounting plate 44, and nuts 44b are respectively fixed to the lower surfaces corresponding to the bolt insertion holes 44a by welding or the like. An upper surface 44c of the mounting plate 44 forms a mounting surface 44d for mounting the backrest 5. A gap 44e is formed between the mounting plates 44 for disposing the tip end portion of the gas spring for adjusting the backrest angle.

  As shown in FIG. 3 to FIG. 5, the synchro-rocking mechanism 26 is for tilting the seat 3 and the backrest 5 at a constant angle ratio, and the front end side of the outer shell 31 of the seat 3 is moved forward. It is supported by a front end portion of the support base 2 via a shaft 27 so as to be movable back and forth, and a rear end side of the outer shell 31 is supported by an intermediate portion 41b of a back support rod 4 via a rear shaft 45. is there. The front shaft 27 is provided in a long hole 22 provided in the front end portion of the support base 2 so as to be slidable in the front-rear direction. Both end portions of the front shaft 27 are provided on the front end side lower surface of the outer shell 31. It is held in the part 31n. The rear shaft 45 is constructed on the intermediate portion 41b of the back support rod 4 as described above, and both ends thereof are held by the rear shaft holding portion 31p provided on the lower surface of the outer shell 31 on the rear end side. Yes.

<Backrest>
As shown in FIGS. 1 to 6 and FIGS. 14 to 18, the backrest 5 includes a back plate 51, a cushion 52 that surrounds the back plate 51, and a back skin material 53 that covers the outside of the cushion 52. It is equipped with.

  3 to 5 and 14 to 18, the back plate 51 includes a back shell 54 having flexibility, the back joint 55 having rigidity attached to the back shell 54, and the back shell. 54, and a back under cover 56 having a front wall 562 facing the front surface 54e of the lower shell 54a of the back shell 54. The back wall 562 rear surface 564 of the back under cover 56 is provided. And a lower portion 54a front surface 54b of the back shell 54 is formed with a receiving portion 57 opened downward.

  As shown in FIGS. 3 to 5 and 14 to 18, the back shell 54 has a three-dimensional shape in which a waist portion 54 c corresponding to the waist of the seated person is greatly curved and approaches a flat plate as it goes upward. A shell main body 541 having an elastically deformable plate shape, a plurality of vertical ribs 542, horizontal ribs 543, and oblique ribs 544 integrally projecting from a front surface 541f of the shell main body 541, and a lower center portion of the shell main body 541 And a joint mounting portion 545 having a surrounding wall 546 protruding toward the front surface 541f of the shell body 541 and a front wall 547 closing the protruding end of the surrounding wall 546. is there. The protruding heights of the vertical rib 542, the horizontal rib 543, and the oblique rib 544 are set so that the vicinity of the center of the waist portion 54c of the back shell 54 is high and gradually decreases toward the periphery of the back shell 54. The projecting end surfaces 542a, 543a, and 544a of the vertical ribs 542, the horizontal ribs 543, and the oblique ribs 544 are configured to belong to one virtual common curved surface P4. A forward-facing surface 547a of the front wall 547 of the joint mounting portion 545 is configured to be flush with the virtual common curved surface P4. Further, on the front surface 541f of the shell body 541, a nut portion 541a for attaching a bag body for holding a lumbar support airbag 71 described later and a nut portion 541c for attaching the back under cover are integrally provided. The front end surface 541b of the nut portion 541a for attaching the bag body belongs to the virtual common curved surface P4. The shell main body 541, the vertical rib 542, the horizontal rib 543, the oblique rib 544, the joint mounting portion 545, the bag mounting nut portion 541a and the back under cover mounting nut portion 541c are made of synthetic resin. Are integrally molded.

The shell main body 541 is an elastically deformable plate that curves smoothly corresponding to the three-dimensional shape, and includes peripheral walls 541e that protrude forward at a constant height on both side edges and upper edges.
The space between the vertical ribs 542 in the left-right direction and the space between the horizontal ribs 543 in the vertical direction are set narrow in the vicinity of the center of the waist 54c and wide in the periphery. The lateral ribs 543 and the oblique ribs 544 of the back shell 54 are partially provided with guide portions 543b and 544b for guiding an air tube 76 that connects the airbag 71 and the pump unit 73. Yes.

  The joint attachment portion 545 is a concave portion of the lower portion of the shell main body 541, that is, a rectangular shape in a rear view from the lower edge central portion of the shell main body 541 to the central portion of the waist portion 54c. A mounting space 548 opened to the back side is formed by the wall 546 and the front wall 547. The surrounding wall 546 is integrally continuous with the vertical rib 542, the horizontal rib 543, and the oblique rib 544, and a reinforcing rib 547b is provided on the back side of the front wall 547. Further, the front wall 547 is provided with a plurality of bolt insertion holes 547c, and a counterbore 547d for accommodating the bolt 549 head 549a is formed on the front side of the bolt insertion hole 547c. Yes.

  As shown in FIGS. 3 to 6 and FIGS. 14 to 16, the back joint 55 extends forward from the joint body 551 fitted to the joint mounting portion 545 and the lower end portion of the joint body 551. The mounting arm portion 552 has an L shape in side view, and the mounting arm portion 552 is attached to the mounting surface 44 d of the back support rod 4. The joint main body 551 has a flat box shape with the front side that is closely fitted in the mounting space 548 open, and has a reinforcing rib 551a inside. A back surface 551 b of the joint body 551 is continuous with the back surface 54 d of the back shell 54. The joint main body 551 includes a nut portion 551c at a portion corresponding to the bolt insertion hole 547c of the joint mounting portion 545 of the back shell 54, and the joint main body 551 is fitted in the mounting space 548. The back joint 55 is attached to the back shell 54 by screwing the bolt 549 inserted through the bolt insertion hole 547c from the front surface 54e side of the back shell 54 into the nut portion 551c. A plurality of upward claws 551d are formed on the front surface of the lower end portion of the joint body 551.

  The mounting arm portion 552 is integrally extended from the lower end of the joint body 551, and includes a pair of left and right mounting walls 553 that contact the mounting surface 44d of the back support rod 4, and the two mounting walls 553. , And a hanging wall 555 suspended downward from the outer edges of the both mounting walls 553, corresponding to the nuts 44b of the back support rods 4 of the both mounting walls 553. Bolt insertion holes 553a are formed in the parts to be attached, and square holes 553b for attaching the cover are provided in the vicinity of the front ends of these mounting walls 553. The upper surface 554a of the central wall 554 is located above the upper surfaces 553c of the mounting walls 553. The attachment arm portion 552 is attached by a bolt 556 attached to the attachment surface 44d of the back support rod 4 from above. Specifically, the mounting arm portion 552 is placed on the mounting surface 44 d of the back support rod 4 such that the tip end portion 4 a of the back support rod 4 is accommodated between the hanging walls 555 of the mounting arm portion 552. The mounting arm portion 552 is fixed to the back support rod 4 by screwing the bolt 556 inserted into the bolt insertion hole 553a from the upper surface 552a side of the mounting arm portion 552 into the nut 44b of the back support rod 4. ing. In this way, the back shell 54 is attached to the back support rod 4 via the back joint 55.

  As shown in FIGS. 3 to 6 and FIGS. 14 to 17, the back under cover 56 includes a top wall 561 attached to the front surface 54 b of the lower end 54 a of the back shell 54, and a lower side from the front edge of the top wall 561. The front wall 562 is extended to the front wall 562, and a receiving portion 57 opened downward is formed between the back surface 564 of the front wall 562 and the lower end portion 54a front surface 54b of the back shell 54. Yes. Thus, the accommodating portion 57 is divided into left and right due to the presence of the mounting arm portion 552 of the back joint 55. The top wall 561 is provided with a mounting projection 563 having a screw hole 563a at its rear edge, and a screw 567 inserted through the screw hole 563a is screwed into a nut portion 541c for mounting the back under cover of the back shell 54. The back under cover 56 is attached to the back shell 54 by wearing. The front wall 562 includes a central front wall portion 565 having a plurality of downwardly bent downward claws 565a on the back surface side, and both front wall portions 566 continuous on both sides of the central front wall portion 565. In addition, a positioning wall 566a that is in contact with or close to the side surface of the mounting arm portion 552 of the back joint 55 is provided at the inner ends of the front wall portions 566 on both sides. A plurality of upward claws 54 f are formed on the front surface of the back shell 54 corresponding to the front wall portions 566 on both sides.

  As shown in FIGS. 5 and 15, the accommodating portion 57 plays a role of accommodating a lower end opening edge portion 531 a of the spine skin material 53, as will be described later, and the downward claw 565 a and the upward direction The claws 54 f and 551 d are for holding the lower end opening edge 531 a of the spine skin material 53. Moreover, the pump unit 73 of the air supply mechanism 72 which is a main part of the operating mechanism is accommodated in one of the accommodating portions 57 divided into the left and right as will be described later.

  As described above, the back plate 51 is mainly composed of the back shell 54, the back joint 55, and the back under cover 56. The back plate 51 is surrounded by a cushion 52 at almost all portions except for the mounting arm portion 552 of the back joint 55 and the vicinity of the opening end of the accommodating portion 57.

  As shown in FIGS. 3 to 6 and 15, the cushion 52 includes a molded urethane 521 attached to the front surface 54 e of the back shell 54 and a slab urethane 522 attached to the back surface 54 d of the back shell 54. Are joined in the vicinity of both side edges of the back shell 54, and as described above, the back plate 51 is entirely swollen. That is, the cushion 52 covers the back shell 54 and the joint body 551 of the back joint 55 attached to the back shell 54. The molded urethane 521 is made by foaming urethane in a mold, and a nonwoven fabric is attached to the back surface thereof. The back surface of the molded urethane 521 is shaped so as to correspond to the virtual common curved surface P4 of the back shell 54, and the protruding end surfaces 542a, 543a, 544a of the vertical rib 542, the horizontal rib 543, and the oblique rib 544 are formed. And it is set so that it may contact | abut to the front facing surface 547a of the said joint attaching part 545. FIG. A groove 521a for receiving the peripheral wall 541e of the back shell 54 is formed in the vicinity of the peripheral edge on the back surface of the molded urethane 521. The slab urethane 522 is obtained by cutting a foamed urethane material that has been previously molded to a predetermined thickness into a required shape, and the slab urethane 522 is not shown in FIGS. 15 and 16. The outer surface of the cushion 52 thus formed is wrapped with the spine skin material 53.

  As shown in FIGS. 1 to 5 and 15, the back skin material 53 includes a bag-shaped skin material main body 531 having the lower end opening edge 531 a at the lower end, and a lower end opening edge 531 a of the skin material main body 531. A synthetic resin central latching member 532 sewn on the front center portion of the lower end opening edge portion 531a, and a synthetic resin both-side latching member 533 sewn on both sides of the front side of the lower end opening edge portion 531a. A metal hook wire 534 held on the rear side of the lower end opening edge 531a is provided. In addition, in FIGS. 3-5, the spine skin material 53 is shown with the dashed-two dotted line.

  Specifically, the skin material main body 531 is formed by sewing a first tension fabric 535 that is relatively thick and difficult to stretch, and a second tension fabric 536 that is relatively thin and rich in stretchability via a mim 537. Is. The first upholstery 535 is mainly configured to continuously cover the front surface 52a, the upper end surface 52b, and the upper half 52d of the back surface 52c of the cushion 52. The second upholstery 536 is configured to cover the side surface 52f of the cushion 52 and the lower half portion 52e of the back surface 52c. A mim 537 positioned at the boundary between the first upholstery 535 and the second upholstery 536 has a ridge shape protruding outward, and covers the back skin material 53 on the cushion 52. At this time, the Mimi 537 portion can be picked and pulled. The central hooking member 532 has a front end portion 532a bent in a U shape in cross section, and the front end portion 532a is a lower edge of the back plate 51, that is, a central front wall of the back under cover 56. It hangs on the lower edge of the portion 565. The front end portion 532a of the center hook member 532 is sandwiched and held between the back surface 565b of the center front wall portion 565 and the downward claws 565a in the hooked state. The both-side latching member 533 has a front end portion 533a bent in a U-shape in cross section, and the front end portion 533a is a lower edge of the back plate 51, that is, both front front walls of the back under cover 56. It hangs on the lower edge of the portion 566. The hooking wire 534 is attached to the lower edge of the skin material main body 531 so as to be partially exposed, and is hooked to the lower edge of the back plate 51. That is, the hooking wire 534 is hooked on the upward claws 54f and 551d in a state where the hooking wire 534 is turned into the accommodating portion 57 together with the lower edge portion of the skin material main body 531.

  The backrest 5 formed as described above is attached to the upward mounting surface 44d of the back support 4 which does not have a rising portion, and the entire mounting portion is covered with the cover assembly 6. All components of the lumbar support device 7 are incorporated into the backrest 5 to form a unit.

<Cover assembly>
As shown in FIGS. 1 to 6 and FIGS. 14 to 16, the cover assembly 6 covers a lower back support cover 61 that covers the lower side of the back support rod 4 and an upper side of the back support rod 4. The first and second upper back support rod covers 62 and 63 are provided so that the first upper back support rod cover 62 and the second upper back support rod cover 63 are independent of each other. It can be attached and detached.

  As shown in FIGS. 1 to 6 and FIGS. 14 to 16, the lower back support cover 61 is provided integrally with the cover body 611 covering the lower side of the back support cover 4 and the cover body 611. A back plate closing portion 612 that closes the housing portion 57 of the back plate 51 and holds the lower end opening edge 531a of the back skin material 53 in the housing portion 57 is provided. The cover body 611 is provided on the bottom plate 613, the left and right side plates 614 rising from the left and right side edges of the bottom plate 613, and the lower surface 4b and the outer surface 4c of the back support rod 4 provided on the inner surface side of the both side plates 614. And a cover positioning rib 614b, which are integrally formed of synthetic resin. On the inner surfaces of the both side plates 614, there are projected cover mounting projections 614a having a cross rib shape engaging with the cover mounting holes 41d of the back support rod 4. The back plate closing portion 612 is integrally provided at the rear end of the cover body 611. The back plate closing portion 612 includes a horizontally long lid plate 615 with a central front edge continuing to the bottom plate 613 of the cover body 611, and left and right front plates 616 rising from the front edge of both ends of the lid plate 615. The cover body 611 and the synthetic resin are integrally formed. The lid plate 615 has a shape corresponding to the opening shape of the accommodating portion 57 that opens to the lower end of the backrest 5, and has both end mounting bosses 615 a that are paired on both ends and left and right on the middle portion. A pair of intermediate mounting bosses 615b is provided. The both-end mounting boss 615a and the intermediate mounting boss 615b are shaped so that a screw (not shown) can be inserted upward from the lower surface side, and the screw inserted into the both-end mounting boss 615a is the back undercover. 56, and a screw inserted into the intermediate mounting boss 615b is screwed into a lower back support cover mounting nut portion 541g provided in the back shell 54. It has become so. In such a mounted state, the housing portion 57 is closed by the cover plate 615 of the back plate closing portion 612. The left and right front plates 616 are continuous with the rear end of the side plate 614 of the cover main body 611 and are positioned so as to overlap the front wall 562 of the back undercover 56 with a gap in the mounted state. That is, the front portion of the lower end opening edge 531 a to which the both side hooking members 533 of the spine skin material 53 are attached is hidden by these front plates 616. In addition, the rear side of the lower end opening edge portion 531 a in the spine skin material 53 is accommodated and held in the accommodation portion 57 while being restrained by the rear edge of the back plate closing portion 612.

  As shown in FIGS. 3 to 6, the first upper back support cover 62 covers a portion corresponding to the mounting surface 44 d of the back support 4 and is attached to the mounting surface 44 d. The mounting arm portion 552 of the backrest 5 and the head portion 556 a of the bolt 556 that fixes the mounting arm portion 552 to the back support rod 4 are hidden by the upper back support cover 62. In other words, the mounting arm portion 552 and the head 556a of the bolt 556 can be exposed only by removing the upper back support rod cover 62, and the backrest 5 can be removed from the back support rod 4. It becomes possible. The first upper back support rod cover 62 has a flat downward channel shape, has a flange portion 621 that rises upward at the rear end, and has an attachment claw 622 whose lower end bends forward on the lower surface of the front end portion. The mounting claw 622 is engaged with the square hole 553b provided in the mounting arm portion 552, and the rear end side is pushed down to be in the mounted state. In the mounted state, the central hooking member 532 of the lower end opening edge portion 531 a of the spine skin material 53 is hidden by the flange portion 621 of the first upper back support rod cover 62.

  As shown in FIGS. 3 to 6, the second upper back support rod cover 63 covers an exposed portion other than the mounting surface 44 d of the back support rod 4. Are independent.

  Note that a window 617 through which the operation lever 74 of the lumbar support device 7 is inserted is formed in the back plate closing portion 612 of the lower back support cover 61 in the cover assembly 6 described above.

<Lumbar support device>
As shown in FIGS. 2 to 6 and FIGS. 14 to 19, the lumbar support device 7 includes a lumbar support airbag 71 disposed between the back shell 54 and the cushion 52 of the backrest 5. And the air supply mechanism 72 connected to the airbag 71 via an air tube 76 for supplying or discharging air to the airbag 71.

  As shown in FIGS. 3 to 5 and 18, the air bag 71 is a normal one that inflates and contracts when supplied with air, and a front surface of the back shell 54 through a flexible deformable bag body 77. 54e. The bag body 77 is open at least at one end in the left-right direction. By screwing screws 78 penetrating the left and right side portions of the upper end portion into the nut portion 541a for attaching the bag body of the back shell 54. Are attached to the front surface 54e of the back shell 54. The airbag 71 is accommodated in the bag body 77. That is, a deformable bag body 77 is attached to the projecting end surfaces 542 a, 543 a, and 544 a of the vertical rib 542, the horizontal rib 543, and the oblique rib 544 in the vicinity of the waist portion 54 c of the back shell 54. Further, the airbag 71 is held inflatable.

  As shown in FIGS. 2, 6, and 14 to 19, the air supply mechanism 72 includes a pump unit 73 that supplies air to the airbag 71, and an operation lever 74 that drives the pump unit 73. The pump unit 73 forming the main part of the air supply mechanism 72 is accommodated in the accommodating portion 57 formed in the lower portion of the backrest 5. In other words, the air supply mechanism 72 is attached to the operation lever 74 that can be operated on both sides of the reference position S2 and the operation lever 74 that is operated to one side, that is, the upper side with respect to the reference position S2. The pump 731 that is energized to supply air to the airbag 71 and the operation lever 74 that is operated to the other side, that is, the lower side with respect to the reference position S2, are energized to release the air in the airbag 71 to the outside. A release valve 732 that discharges to the rear side, and reverse operation suppression means 733 that prevents or suppresses the operation lever 74 from operating beyond the reference position S2 due to the reverse driving force from the pump 731. It has.

  As shown in FIGS. 16, 18, and 19, the pump unit 73 includes a lever support member 79 that supports the operation lever 74 so as to be rotatable in the vertical direction, the pump 731, the release valve 732, The reverse operation inhibiting means 733 is assembled into a unit, and the operation lever 74 is accommodated in the accommodating portion 57 so as to protrude outward from the lower end of the backrest 5. The lever support member 79 is a metal member that includes a top plate 791 that is screwed to the ceiling portion of the housing portion 57 and a lever mounting arm 792 that is suspended downward from both front and rear edges of the top plate 791. The base end portion 74a of the operation lever 74 is supported by the lever mounting arm 792 so as to be rotatable about a shaft. The pump 731 is a rubber balloon type having an air inlet 731a having an inflow check valve and a discharge port 731b having a discharge check valve. Then, when the internal air is discharged from the discharge port 731b and the pressing force is extinguished, the air is taken in from the air inflow port 731a and returns to its original shape. The release valve 732 is directly connected to the discharge port 731b of the pump 731. When the operation button 732a is not pressed, the discharge port 731b communicates with the airbag 71 through the air tube 76. The air in the airbag 71 is released into the atmosphere only while the operation button 732a is pressed. Since the pump 731 and the release valve 732 are ordinary ones, a detailed description of the structure is omitted. The reverse operation inhibiting means 733 includes a spring 733a that elastically biases the lever main body 74b in the reference position S2 direction in a region where the lever main body 74b of the operation lever 74 rotates from the reference position S2 to the other side. Is.

  As shown in FIGS. 1, 2, 4 to 6 and 14 to 19, the operation lever 74 includes the lever main body 74 b rotatably supported by the lever support member 79, and the lever main body. A pump pressing portion 74c for biasing the pump 731 when the lever main body 74b is rotated from the reference position S2 to one side; and the lever main body 74b is moved from the reference position S2 to the other side. In this embodiment, the pump pressing portion 74c and the valve pressing portion 74d are integrated with the lever main body 74b. The valve pressing portion 74d biases the release valve 732 when rotated. Is provided. The operation lever 74 is disposed with its distal end facing obliquely downward and outward. The pump 731 is lifted from the reference position S2 by pulling the distal operation portion 74f of the operation lever 74 upward. When the operation lever 74 is pushed down from the reference position S2, the operation button 732a of the release valve 732 is pressed and urged by the valve pressing portion 74d. The operation lever 74 is configured such that the base end portion 74e of the lever main body 74b, the pump pressing portion 74c, and the valve pressing portion 74d are accommodated in the accommodating portion 57. The distal end side of the lever main body 74 constituting the portion 74f is extended to the outside through a window 617 provided in the back plate closing portion 612 of the lower back support cover 61.

  Air discharged from the pump 731 of the pump unit 73 via the release valve 732 is guided to the airbag 71 via the air tube 76. The air tube 76 extends from the pump unit 73 housed on one side of the housing portion 57, passes between the back support rod 4 and the lower back support rod cover 61 and passes through the other side of the housing portion 57. To the back surface 77a side of the bag body 77 through the front surface 54e of the back shell 54 and connected to an unillustrated air outlet inlet of the airbag 71 exposed on the back surface 77a side. Has been.

  Hereinafter, the seat 3 will be described in detail.

  The seat 3 of this embodiment includes the outer shell 31, the inner shell 32 disposed on the outer shell 31 so as to be slidable in the front-rear direction, and the cushion 35 disposed above the inner shell 32. And a seat skin material 36 disposed on the outer side of the cushion 35. By tightening a string 362a provided on an outer edge 364 of the seat skin material 36, the inner shell 32 is seen from the outside. And a so-called sitting walnut type covering the cushion 35. Further, the seat 3 of the present embodiment has a depth changing means for changing the seating depth dimension, and this depth changing means does not involve the interlocking transition of the load receiving surface P3. The seating depth dimension can be changed.

  Each of the outer shell 31 and the inner shell 32 has a shape in which the center is curved downward, and the load receiving surface P3 of the outer shell 31 is curved so that the front portion is located above the rear portion. The load transmitting portion 327d of the inner shell 32 is curved so that the front portion is positioned above the rear portion.

  The curved shape of the load receiving surface P3 of the outer shell 31 and the curved shape of the load transmitting portion 327d of the inner shell 32 are different from each other. That is, the inclination of the inner shell 32 is set more gently than the inclined portion P31 of the load receiving surface P3 of the outer shell 31. Therefore, the inner shell 32 is supported by the outer shell 31 at the front and rear while being in a floating state at the center portion in the front-rear direction, and when a load is applied, the center of the inner shell 32 is pulled downward, and elasticity is easily obtained. Further, since the inclination of the load transmitting portion 327d of the inner shell 32 corresponding to the inclined portion P31 is set more gently than the inclined portion P31 of the load receiving surface P3 of the outer shell 31, the load receiving surface P3 and the load transmission The space 327f is formed between the lower surface 327e of the portion 327d. This space 327f is the largest when the inner shell 32 is slid rearward relative to the outer shell 31, and the vertical dimension at that time is set to be approximately 10 mm to 20 mm.

  In the outer shell 31, the inclined portion P31 is formed along the curved shape of the load receiving surface P3 of the outer shell 31. The presence of the inclined portion P31 can suppress the forward shift of the seated person and improve the fit at the time of sitting. The load receiving surface P3 is formed around a sitting reference point S1 designed as a center of the seated person's load. In the case of a single leg as in the present embodiment, the load receiving surface P3 is axially disposed on the support column 12. Therefore, the seating reference point S1 is set directly above the support column 12, and the inclined portion P31 is disposed in front of the sitting reference point S1.

  The load receiving surface P3 does not move as the inner shell 32 and the load transmitting portion 327d of the inner shell 32 slide. That is, the load receiving surface P3 may be moved horizontally by the caster 13 or tilted by the synchro-rocking mechanism 26, but may not be moved by an operation for changing the seating depth dimension of the seat 3. Therefore, the depth dimension of the seat 3 can be changed while keeping the load receiving surface P3 provided in the second half center portion 315 at a constant position.

  Note that no ribs or protrusions projecting upward are formed on the load receiving surface P3 of the outer shell 31, and a slit 327g extending in the front-rear direction is formed on the load transmitting portion 327d of the inner shell 32. Only the ribs and protrusions that protrude downward are not formed. Therefore, when the inner shell 32 is slid back and forth with respect to the outer shell 31, it is easy to slide.

  The outer shell 31 includes a shell-shaped outer shell main body 311 formed so as to be gradually raised toward the periphery except for the rear half central portion 315 located near the center of the rear half region 31b, and the outer shell main body 31 The vertical ribs 312, the horizontal ribs 313, and the diagonal ribs 314 are integrally provided at a portion of the upper surface 311 a of 311 excluding the rear half central portion 315. The outer shell 31 includes the four slider attachment portions 31e provided in the vicinity of the four corners, and the engagement provided outside the slider attachment portion 31e located on the left front side of the seat 3 among the slider attachment portions 31e. It includes a portion 31r, the slit 31h provided outside the engaging portion 31r and penetrating in the vertical direction, and the contact surface 31m provided near the lower surface opening end of the slit 31h.

  The operation end 349 that is an operation portion of a seat slide mechanism that slides back and forth is disposed below the outer shell 31, and the operation end 349 is disposed on the inner side of the left side edge of the seat 3. . The operation member 341 is of a push button type and is provided so as to be movable in the vertical direction with respect to the seating surface P1. In other words, the lower portion of the operation member 341 protrudes downward from the lower surface 31d of the outer shell 31 of the seat 3, and the operation of pushing upward with the finger of the seated person becomes the disengagement operation of the engaging portion 31r as it is. Is set to That is, in the present embodiment, the push button 347 and the engaging portion 31r are integrally formed, and the operation in the vertical direction of the operation end 349 is transmitted as it is and the operation in the vertical direction of the engaging portion 31r is performed. . As described above, the operation member 341 according to the present embodiment slides in the vertical direction with respect to the inner shell 32 that slides in the front-rear direction, and alternatively takes an engaged state and a non-engaged state. To get. Further, the upper end surface of the head portion 344 of the operation member 341 is flat and is pushed downward by the cushion 35 in which a non-woven fabric (not shown) is attached on the lower surface 35b side.

  A gap corresponding to the peripheral edge 326 of the inner shell 32 is formed between the lower surface 326 c of the inner shell 32 and the upper surface 32 a of the outer shell 31. On the other hand, the portion corresponding to the region 327 surrounded by the step portion 325 of the inner shell 32, that is, the portion corresponding to the inside of the upright wall 325 a of the step portion 325 is the lower surface of the inner shell 32 and the upper surface 32 a of the outer shell 31. There is no gap formed between them. The slide guide mechanism 33 and the slide positioning mechanism 34 are arranged in the range near the center of the seat 3 with no gap, and are set so as not to cause rattling during the slide operation.

  The upper surface 332a of the retaining head 332 of the slider 331 disposed in the guide slit 322 of the inner shell 32 is flush with the protruding end surface 323a of the head protecting rib 323 of the inner shell 32. Is set. A portion of the lower surface 35 b of the cushion 35 corresponding to the slide guide mechanism 33 is inclined corresponding to the protruding end surface 323 a of the head protecting rib 323 and the upper surface 332 a of the slider 331. Thus, by making the slider 331 in a shape corresponding to the curvature of the seat 3, unnecessary cutting of the cushion 35 becomes unnecessary, and the seating feeling can be improved.

  Next, the change of the seating depth dimension will be described with reference to FIGS. 20 to 23 show an end face obtained by cutting the outer shell 31 and the inner shell 32 at a position slightly shifted from the center in the left-right direction, and the load transmission portion 327d provided with the slit 327g of the inner shell 32 is shown. A pattern is attached.

  First, FIG. 20 and FIG. 21 show a state where the inner shell 32 is positioned rearward relative to the outer shell 31, that is, a state where the inner shell 32 is disposed at the rear slide position. As shown in FIG. 20, in a state where no load is applied to the seated person, a relatively large space 327f is formed between the load receiving surface P3 of the outer shell 31 and the lower surface 327e of the load transmitting portion 327d of the inner shell 32. Has been. In this state, when a load is applied from above the seated person, as shown in FIG. 21, the load transmitting portion 327d having the flexibility of the inner shell 32 bends and deforms downward, and the load receiving surface P3 and the load transmitting portion are deformed. The lower surface 327e of 327d contacts and the space 327f disappears.

  Next, FIG. 22 and FIG. 23 show a state where the inner shell 32 is positioned relatively forward with respect to the outer shell 31, that is, a state where the inner shell 32 is disposed at the front slide position. As shown in FIG. 22, a relatively small space 327f is formed between the load receiving surface P3 of the outer shell 31 and the lower surface 327e of the load transmitting portion 327d of the inner shell 32 in a state where no load is applied to the seated person. Has been. In this state, when a load is applied from above the seated person, as shown in FIG. 23, the load transmitting portion 327d having the flexibility of the inner shell 32 bends and deforms downward, and the load receiving surface P3 and the load transmitting portion are deformed. The lower surface 327e of 327d contacts and the space 327f disappears.

  In this manner, the range in which the inner shell 32 of the seat 3 can be bent changes depending on the front / rear slide position.

  A seated person with a relatively small physique often places the inner shell 32 in the rear slide position, and the space 327f is formed relatively large in a no-load state. Is bent, and an effect that cushioning properties are easily obtained is obtained. On the other hand, a seated person having a relatively large physique often places the inner shell 32 in the forward slide position, and the space 327f is formed to be relatively small in a no-load state. The effect that it can be received firmly is obtained.

  In addition, the distance between the backrest 5 and the seating surface P1 is substantially constant regardless of the physique, and compared to the conventional one in which the load receiving surface P3 moves as the seating depth dimension of the seat 3 changes. Since the seat 3 in the form does not move along with the slide movement, the load receiving surface P3 can give an optimal fit to many people with different physiques. In other words, the seat 3 of this embodiment can change the seating depth dimension of the seat 3 by sliding the inner shell 32 with respect to the outer shell 31, but the load receiving surface P3 is the inner shell. It does not move in conjunction with 32 slide movements. That is, when the seating depth dimension of the seat 3 is changed, the load receiving surface P3 is provided on the outer shell 31 that does not move along with the change. The presence of the inclined portion P31 provided in the outer shell 31 can suppress the forward displacement of the seated person as described above, and the downward force of the seated person is uniformly applied to fit. A feeling can be improved.

  This structure also provides an effect that the operation of sliding the inner shell 32 backward with respect to the outer shell 31 can be easily performed. That is, in particular, in the chair C provided with moving means such as the casters 13, when the inner shell 32 is moved forward relative to the outer shell 31, the seated person leans on the backrest 5 and puts this backrest 5 on the backrest 5. Although it is possible to perform a slide operation while pushing the waist forward while using it like a scaffold, it is relatively easy, but there is nothing that can be used like a scaffold when moving back relatively, so a seated person However, there is a problem that it is difficult to perform such a slide operation while sitting down. However, in the case of the present embodiment, when the load transmission portion 327d provided on the inner shell 32 receives a load from a seated person, the load transmission portion 327d and the load receiving surface are elastically deformed downward. Since P3 comes into contact with the inner shell 32, when the inner shell 32 is moved rearward relative to the outer shell 31, the seat occupant moves the load to the vicinity of the upper end of the inclined portion P31 and moves to the inclined portion P31. If the waist position is moved so as to apply weight, the inner shell 32 can be moved rearward in the manner of a slide using the weight of the seated person. Thus, by applying a seated person's load to inclined part P31, the force which slides down backwards arises and it can perform back sliding operation more easily than before.

  As described above, the chair C according to the present embodiment includes the seat 3 having the depth changing means for changing the seating depth dimension, and the seat 3 receives the load from the seated person. The outer shell 31 which is a hard member having a load receiving surface P3 is provided, and the load receiving surface P3 is formed around the sitting reference point S1, and the front side of the sitting reference point S1. An inclined portion P31 that gradually rises toward the front is provided, and the depth changing means is configured to be able to change the seating depth dimension of the seat 3 without accompanying the interlocking movement of the load receiving surface P3. It is possible to suppress the forward displacement of the seated person, and even if the seating depth dimension is changed, the load receiving surface P3 does not move in conjunction with the seated person. Give a fit Rukoto can.

  In the present embodiment, the hard member is the outer shell 31 having the load receiving surface P3 on the upper surface 31c side, and the depth changing means slides the inner shell 32 on the outer shell 31 in the front-rear direction. The inner shell 32 can be locked by being moved to a desired slide position by a slide positioning mechanism 34, and the inner shell 32 is located at a portion corresponding to the load receiving surface P3. Since the load transmitting portion 327d for supporting the load from the seated person on the load receiving surface P3 is provided, it is possible to give a feeling of fit at the time of sitting to many people having different physiques. And there is also an effect that the shape of the seating surface P1 can be easily adjusted without being influenced by the shape of the outer shell 31. More specifically, when a seating load is applied, the load receiving surface P3 having an inclined portion P31 that fits the seated person's buttocks and thighs can be formed, and the upper surface 35a of the cushion 35 that forms the seating surface P1. The shape of can be relatively flat. In the present embodiment, the upper surface 35a of the cushion 35 can be made relatively flat so that the appearance can be improved and the seat skin material 36 can be easily stretched. When seated, the upper surface 35a of the cushion 35 corresponding to the load receiving surface P3 is recessed downward, so that it is possible to give a seated fit while suppressing the forward displacement of the seated person.

  The load transmitting portion 327d of the inner shell 32 can be elastically deformed in the thickness direction until it receives a load from a seated person and comes into contact with the load receiving surface P3. Since the space 327f is formed between the lower surface 327e and the load receiving surface P3, the impact at the time of sitting can be eased by this space 327f, and the seating feeling can be improved.

  Since the load transmitting portion 327d is formed by forming a plurality of slits 327g extending in the front-rear direction at intervals corresponding to the load receiving surface P3 of the inner shell 32, the inner shell 32 is It is easy to move in the front-rear direction on the outer shell 31, and further, the lower surface 35b side of the cushion 35 can be appropriately supported between the adjacent slits 327g in a state where no load is applied to the seated person.

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

  The chair of the present invention may not have a backrest.

  The depth changing means is, for example, a front-end slide type in which the entire inner shell moves in the front-rear direction relative to the outer shell as described above. The retractable type that can take the state and the state extended forward, that is, the seat end depth dimension is reduced by setting the front end portion of the shell to be wound, and the front end portion of the shell is moved forward The thing which enlarges the seating depth dimension of a seat by setting it as the extended state can be considered. Furthermore, a partial front / rear slide type in which the other shell provided at the front end of the one shell moves relative to the one shell relative to the front / rear direction, in other words, projects from the front end of the one shell. A forward extension type in which the other shell that can be immersed can be in a state where it is immersed in one shell and a state in which it is extended forward, that is, the other shell is immersed in one shell. It is conceivable to increase the seating depth dimension of the seat by reducing the seating depth dimension of the seat and making the other shell extend forward from the one shell.

  The hard member is not limited to the outer shell, and may be an inner shell or another shell.

  The load transmitting portion may be any as long as it is provided at a portion corresponding to the load receiving surface so that the load receiving surface carries the load from the seated person. For example, FIG. As shown, a window penetrating in the vertical direction of the inner shell X32 may be formed. In other words, the load transmitting portion X327d of the inner shell X32 may be a window-like shape obtained by removing the entire region corresponding to the load receiving surface XP3. In addition, about each part of FIG. 24, "X" is attached | subjected to the code | symbol corresponding to the said embodiment, and detailed description is abbreviate | omitted.

  Further, as schematically shown in FIGS. 25 and 26, the load transmitting portion Y327d of the inner shell Y32 is made of a material that can be flexibly deformed, and the load receiving surface is always provided regardless of the sliding movement of the inner shell Y32. It may be one that can substantially adhere to YP3. That is, the seat Y3 according to the present modification includes an outer shell Y31 having a load receiving surface YP3 that receives a load from a seated person, and the load receiving surface YP3 is formed around the sitting reference point YS1. In addition, an inclined portion YP31 that gradually rises forward is provided on the front side of the sitting position reference point YS1, and the depth changing means does not involve the interlocking shift of the load receiving surface YP3. The seating depth dimension of Y3 can be changed, and the inner shell Y32 has a load transmission portion for supporting the load from the seated person on the load receiving surface YP3 at a portion corresponding to the load receiving surface YP3. Y327d is provided. The load transmitting portion Y327d of the inner shell Y32 is made of a material that can be flexibly deformed. Therefore, when the inner shell Y32 is positioned relatively rearward with respect to the outer shell Y31 as shown in FIG. The load receiving surface YP3 is substantially in close contact with the outer shell Y31 as shown in FIG. 26, and even when the inner shell Y32 is positioned relatively forward, the shape of the load transmitting portion Y327d is changed to change the load receiving surface. It is designed to be in close contact with YP3. Although not shown, even in the state between FIGS. 25 and 26, the load transmitting portion Y327d is substantially in close contact with the load receiving surface YP3. Even if it is such, the effect according to the said embodiment is acquired.

  Also, the slits extending in the front-rear direction are provided in the inner shell. However, if ribs or concavo-convex parts extending in the front-rear direction are made in addition to these, when moving in the front-rear direction with respect to the outer shell, these ribs and undulations It is possible to make it easy to slide in the front-rear direction by being guided by a part or the like.

  In addition, various changes may be made without departing from the spirit of the present invention.

C ... Chair S1, YS1 ... Sitting reference point 3, X3, Y3 ... Seat 31, X31, Y31 ... Outer shell 31c ... Upper surface P3, XP3, YP3 ... Load receiving surface P31, XP31, YP31 ... Inclined portion 32, X32, Y32 ... Inner shell 327d, X327d, Y327d ... Load transmission portion 327e ... Lower surface 327f ... Space 327g ... Slit 34 ... Slide positioning mechanism

Claims (6)

Comprising a seat with depth changing means for changing the seating depth dimension,
The seat includes an outer shell which is a hard member having a load receiving surface for receiving a load from a seated person on the upper surface side ,
The load receiving surface is formed with a seating reference point as a center, and has an inclined portion that gradually rises forward toward the front side of the sitting reference point, and further forward and forward than the inclined portion. The slope of the rear part is gentler than the slope part,
The depth changing means is provided so that the inner shell can be slid in the front-rear direction on the outer shell, and the inner shell can be locked by moving it to a desired slide position by a slide positioning mechanism. There is also a chair characterized in that the seating depth dimension of the seat can be changed without accompanying the interlocking transition of the load receiving surface. The inner shell is provided with a load transmitting portion for supporting a load from a seated person on the load receiving surface at a portion corresponding to the load receiving surface, and the inclination of the load transmitting portion is inclined to the load receiving surface. The chair according to claim 1, wherein the chair is set more gently than the inclination of the inclined portion . The load transmitting portion of the inner shell can be elastically deformed in the thickness direction until it receives a load from a seated person and comes into contact with the load receiving surface. When there is no load, the lower surface of the load transmitting portion and the load receiving surface The chair according to claim 2, wherein a space is formed at least partially between the inner shell and the space, and the size of the space changes as the inner shell slides back and forth . The chair according to claim 3, wherein the load transmitting portion is formed by forming a plurality of slits extending in the front-rear direction at intervals in the left-right direction at a portion corresponding to the load receiving surface of the inner shell. The chair according to claim 2, wherein the load transmitting portion of the inner shell is made of a material that can be deformed flexibly and can always be in close contact with the load receiving surface regardless of the sliding movement of the inner shell. The chair according to claim 2, wherein the load transmitting portion of the inner shell has a window shape formed by removing the entire area corresponding to the load receiving surface.

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