JP2005237471A - Seat or backrest of chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the edge part of a cushion material from being turned up from a seat inner shell even in the constitution that the seat inner shell and the cushion material are separately molded and both are just piled up. <P>SOLUTION: The edge part of the cushion material 20 is rolled onto the lower surface of the seat inner shell 19 and pressed and fixed to the seat inner shell 18 by a facing material 20. An upward bank part 62 extended over the entire periphery is formed on the outer periphery of the seat inner shell 18, and a roughly horizontal outward flange 63 is formed at the upper end of the bank part 62. When the edge part of the cushion material 20 is to be turned up, since the flange 63 performs the function of a stopper, the cushion material 20 is not turned up. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a chair seat or backrest.

  For example, the seat of a swivel chair often used for office work has a structure in which a cushion material is laminated on the upper surface of an inner shell made of synthetic resin, and the skin material made of various materials such as cloth and leather is stretched on the cushion material. The peripheral portion of the skin material is wound around the lower surface of the peripheral portion of the inner shell.

  As a method of holding the peripheral portion of the skin material in a state where it is wound around the back side of the inner shell, it can be adhered with an adhesive, fixed with a tucker, or a cylindrical portion extending over the entire circumference is formed on the peripheral portion. A method of narrowing the string material or the wire material inserted through the cylindrical portion is employed.

  The cushion material may be manufactured separately from the inner shell, or may be integrally formed with the inner shell by an insert molding method. In the former, there are a case where the cushion material is simply overlapped with the inner shell and a case where the cushion material is adhered with an adhesive.

  Further, there are cases where the cushion material overlaps only the upper surface of the inner shell, and cases where the cushion material is wound so that the peripheral edge portion of the cushion material overlaps the outer peripheral surface of the inner shell.

  Manufacturing the cushion material separately from the seat inner shell and stacking it on the inner shell has the advantage of easy separation and recycling after disposal, and the peripheral edge of the cushion material. Is wrapped so as to overlap the outer peripheral surface of the inner shell, there is no rugged feeling at the peripheral edge of the seat, and the sitting comfort is excellent.

  However, when the cushion material is not bonded to the inner shell and the peripheral edge is wound around the outer peripheral surface side of the inner shell, for example, a person may unconsciously pull the palm up against the front edge of the seat while sitting. By operating, there is a risk that the edge of the cushion material will bend from the inner shell. Similar malfunctions can occur in the backrest.

  On the other hand, if the cushion material is integrally molded or bonded to the seat inner shell, the problem of cushion material squeezing can be solved, but integral molding requires expensive mold equipment, and bonding increases the number of processes. In both cases, there is a problem that it takes time to separate the inner shell and the cushioning material after disposal, and the load on the environment is large.

  This invention makes it a subject to improve such a present condition.

  The seat or the backrest according to the invention of claim 1 includes an inner shell made of synthetic resin, a cushion material superimposed on the inner shell, and a skin material covering the cushion material from the surface side. The peripheral portion is wound so as to overlap the outer peripheral surface of the inner shell, and the peripheral portion of the skin material is wound on the back side of the peripheral portion of the inner shell. As a feature of the configuration, a stepped portion that is stepped down toward the seated person is formed on a part or the whole of the outer periphery of the inner shell, and the stepped portion is wrapped with the cushion material.

  According to a second aspect of the present invention, in the first aspect, a bank portion protruding toward the seated person is formed on the outer periphery of the inner shell so as to extend over substantially the entire circumference. The step portion is formed by forming an outward flange.

  According to a third aspect of the present invention, in the first or second aspect, the cushion material is formed separately from the inner shell and overlaps the inner shell without being bonded. A cylindrical portion extending substantially over the entire circumference is formed. By binding a single string or wire passed through the cylindrical portion and narrowing the cylindrical portion, the peripheral portion of the skin material is made to be the inner shell. It is held on the back side of the peripheral edge.

  According to a fourth aspect of the present invention, in the third aspect, on the back side of the peripheral edge portion of the inner shell, a hook-shaped holding portion into which the cylindrical portion of the skin material is fitted from the outside is skipped at appropriate intervals along the circumferential direction. Is formed.

  According to the present invention, by forming a step portion on the outer periphery of the inner shell, it is possible to prevent the edge portion of the cushion material from dripping from the inner shell without bonding the cushion material to the inner shell or integrally molding the cushion material. it can.

  If comprised like Claim 2, by forming the bank part (it may be called a surrounding wall part) in an inner shell, it prevents that an inner shell deform | transforms excessively and maintains intensity | strength of cushioning material. It is suitable for preventing dripping.

  As a means for holding the peripheral portion of the skin material in a state where it is wound around the back side of the inner shell, if this is bound through a string or wire through a tubular portion formed on the skin material as in claim 3, it is bonded or tacked. There is an advantage that the separation work after the disposal can be easily performed compared with the case where it is.

  In this case, if constituted as in claim 4 in addition to claim 3, it is possible to accurately position the skin material, prevent a person from causing the edge of the skin material from the inner shell with a finger, There is also an advantage that it is possible to prevent the material or the wire material from being stretched too strongly.

  Next, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, the present invention is applied to a chair seat.

(1). Basic structure of chair First, the basic structure of a chair will be described with reference to FIGS. FIG. 1 is a side view of a chair. As shown in FIG. 1, the chair includes a leg 1 with casters, a seat 2, a backrest 3, and an armrest 4. The leg 1 is provided with a leg support 5 that is freely extendable and rotatable, and a support base 6 is fixed to the upper end of the leg support 5.

  The seat 2 is attached to the seat bracket 8 via the outer shell 7, and the front end portion of the seat bracket 8 is attached to the front end portion of the support base 6 so that it can be tilted backward and retracted by the first shaft 9. ing.

  Further, the front end portion of the tilt frame 10 is connected to the rear base portion of the support base 6 so as to be tiltable backward by the second shaft 11, and a back column 12 is provided at the rear of the tilt frame 10. The backrest 3 is attached to. A lumbar support 13 is disposed between the back column 12 and the backrest 3 so as to be adjustable in height.

  Further, the rear portion of the tilting frame 10 with respect to the third shaft 14 and the rear portion of the seat receiving bracket 8 are connected by the third shaft 14 so as to be relatively rotatable. For this reason, when the backrest 3 tilts backward, the seat 2 also moves backward while tilting back together.

  2 is an exploded perspective view of main members constituting the support mechanism, FIG. 3A is a longitudinal side view of the seat portion, FIG. 4 is a plan view taken along line IV-IV in FIG. 3, and FIG. It is a separation perspective view of a related member.

  For example, as is clear from FIG. 2, the support base 6 is formed in a box shape with an upward opening provided with left and right side plates 6 a, and an inner bracket 15 is fixed to the rear portion of the support base 6. The top of the is fixed. A slit 16 for pivotally supporting the first shaft 9 is formed in the front part of the left and right side plates 6a of the support base 6 so as to open forward.

  A pair of seat brackets 8 are arranged on the left and right, a first shaft 9 made of a round pipe is fixed to the front by welding, and a third shaft 14 made of a round pipe is fixed to the rear by welding. Has been.

  The seat bracket 8 is formed with a flange 8a that extends outward in the left and right directions. Although the details are omitted, the outer shell 7 is attached to the flange 8a so as to be movable back and forth. As shown in FIG. 3A, the seat 2 includes an inner shell (seat plate) 18 made of synthetic resin, a cushion 19 stretched on the upper surface thereof, and a skin material 20 that wraps the cushion material 19 from above. Yes. Details thereof will be described later.

  For example, as shown in FIG. 5, the tilting frame 10 is formed in an outwardly U-shaped cross section and is disposed on the left and right, while the back struts 12 are disposed on the left and right with a slight gap therebetween. The lower portions of the back struts 12 are bent sideways and fitted into the tilting frame 10 and fixed by welding. The lower portions of the left and right back struts 12 are integrally connected by a lower connection fitting 20 welded to them.

  Note that the tilting frame 10 and the back column 12 can be integrated. Further, the tilt frame 10 and the back column 12 do not have to be arranged in pairs on the left and right, and may be one. Further, it is possible to directly attach the backrest 3 to the tilting frame 10 without providing the back column 12.

  The inner bracket 15 includes a front wall 15a that is substantially perpendicular to the bottom surface of the support base 6, and a movable rear spring receiving device 21 is disposed on the front side of the front wall 15a, and the spring 22 is disposed from the rear. I support it.

  The left and right front bushes 23 are fitted with front spring receivers 24 sandwiched between the first shaft 9 and the inside of the support base 6. The left and right front bushes 23 are made of synthetic resin and separated into two parts, upper and lower, and the first shaft 9 is fitted to the front bush 23 so as to be movable back and forth. As shown in FIG. 3B, the front bush 23 is formed in a U-shape that opens rearward, and this may be mounted in the slit hole of the support base 6.

  The left and right front bushes 23 and the front spring receiver 24 are fitted in the interior of a metal plate front metal fitting 25 with a U-shape facing forward when viewed from the side. The front metal fitting 25 is fixed to the support base 6 by welding or the like, and the left and right front bushes 23 are fastened to the front metal fitting 25 with screws 25a. The second shaft 11 is fastened with a screw to the lower surface of the support base 6 via a center bush 26 and a center fitting 27.

  The third shaft 14 is connected to a bridge member 28 arranged so as to span the left and right tilt frame 10 by a pair of left and right synthetic resin rear bushes 29 and rear metal fittings 30. The bridge member 28 is fixed to the tilting frame 10 by welding (it may be screwed).

  When the backrest 3 is tilted backward, the seat 2 is also interlocked and retracted and tilted backward. However, in order to regulate the rearward tilt angle of the backrest 3 and the seat body 2, as shown in FIG. A stopper 31 with which the third shaft 14 abuts at the lowering lower limit is provided.

  5, reference numeral 32 denotes a back inner shell constituting the backrest 3, reference numeral 33 denotes a back cover, and reference numeral 34 denotes a center cover. The center cover 34 is configured to cover the tilt frame 10 and a space between the tilt frame 10 and the rear portion of the bridge member 28.

  As partially shown in FIGS. 3A and 5, a gas spring 36 that switches the backrest 3 between a free state in which the backrest 3 can be tilted and a locked state in which the backrest 3 cannot be tilted extends in the front-rear direction behind the support base 6. Are arranged as follows. A front end portion of the gas spring 36 is attached to a U-shaped bearing bracket 37 fixed to the rear surface of the support base 6 so as to be vertically rotatable by a horizontal pin 38.

  Further, a piston 39 of the gas spring 35 is provided, and a movable bracket 40 is fixed to the rear end of the piston 39, and a fixed pin 41 fixed to the lower portion of the back column 12 is fixed with a horizontal pin 42. It is attached. A push valve (not shown) protrudes from the tip of the piston 39, and the lock of the gas spring 35 is released by pressing the push valve with a lever (not shown).

  The center cover 34 is provided with a front wall 34a, and a notch 43 for avoiding interference with the gas spring 35 and a projection 44 for avoiding interference with the lever are formed on the front wall 34. doing. In addition, the chair of this embodiment has also devised cover, and this point will be described later.

(2) Seat Outer Shell and Seat Inner Shell Next, the seat outer shell 7 and the seat inner shell 18 will be described mainly with reference to FIGS.

  6 is a plan view of the seat outer shell 7, FIG. 7 is a sectional view taken along the line VII-VII of FIG. 6, FIG. 8 is a bottom view of the seat inner shell 18, and FIG. 9 is a separation of the seat outer shell 7 and the seat inner shell 18. FIG. 10 is a vertical side view of the seat inner shell 18 attached to the seat outer shell 7, and FIG. 11 is a view of the seat inner shell 18 attached as seen from XI-XI in FIGS. 6 and 9. 12 is a sectional view taken along the line XII-XII of FIG. 11, FIG. 13 is a bottom view of the seat 2 with the cushion material 19 stretched, and FIG. 14A is an XIV-XIV of FIG. A sectional view, (A) is a partially enlarged view of (B).

  The seat outer shell 7 and the seat inner shell 18 are made of synthetic resin (for example, made of polypropylene), and are each formed in a concave shape upward in a front view. 11, the depth of the seat outer shell 7 is set to be deeper than the depth of the seat inner shell 18, so that the outer periphery of the seat inner shell 18 is the outer periphery of the seat outer shell 7. The space is vacant between the seat outer shell 7 and the seat inner shell 18. For this reason, the seat inner shell 18 is allowed to be elastically deformed and sunk by the seating.

  An upward frame portion 7 a that covers the seat receiving metal fitting 8 is formed in a substantially front half portion of the seat outer shell 7 and along a longitudinal longitudinal center line. This is for avoiding interference with the seat receiving bracket 8, but of course it may be omitted.

  On the lower surface of the seat outer shell 7, a group of guide claws 46 that embrace the upper flange 8 a of the seat receiving bracket 8 is formed. For this reason, the front and rear positions of the seat outer shell 7 and the seat 3 can be adjusted. Further, as shown in FIG. 11, the seat outer shell 7 is formed with downward ribs 7b for guiding the seat receiving metal fitting 8 from the inside.

  In this embodiment, the front and rear positions of the seat 3 are adjusted stepwise, and for this adjustment, the adjustment lever (not shown) is engaged with or disengaged from the flange 8a of one seat receiving bracket 8. A notch 8b (see FIGS. 2 and 4) is formed.

  As a method for attaching the seat inner shell 18 to the seat outer shell 7, for example, as shown in FIGS. While a plurality of projections are provided at appropriate intervals, the seat inner shell 18 is formed with a recess 48 in which the locking claw 47 escapes and fits, and a stepped receiving portion 49 positioned on the front side of the recess 48. Yes.

  Accordingly, when the seat inner shell 18 is shifted rearward with the recess 48 fitted to the locking claw 47, the receiving portion 49 of the seat inner shell 18 engages with the locking claw 47 of the seat outer shell 7, and the seat The inner shell 18 is held so as not to move upward from the seat outer shell 7.

  As means for holding the seat inner shell 18 so as not to move forward, a pair of left and right square engagement holes 50 (see FIG. 6) are formed in the front portion of the top plate of the upward frame portion 7a of the seat outer shell 7. On the other hand, the seat inner shell 18 is provided with a mountain-shaped stopper portion 51 that faces downward in a side view and is fitted into the square engagement hole 50. For example, as shown in FIG. 8, the stopper portion 51 is surrounded by a slit 52 having a U-shaped rearward opening in a plan view. Therefore, the stopper portion 51 can be bent and deformed in the vertical direction.

  In the front portion of the seat inner shell 18, a front claw 53 that engages with the front end edge of the upward frame portion 7 a in the seat outer shell 7 from below and a front foot 54 a that contacts the upper surface of the seat outer shell 7 are integrated. Provided. On the other hand, an engagement hole 55 for engaging the front claw 53 is formed in the front portion of the seat outer shell 7.

  After the receiving portion 49 of the seat inner shell 18 is engaged with the locking claw 47 of the seat outer shell 7, when the front portion of the seat inner shell 18 is pushed downward, the stopper portion 51 is deformed against elasticity. The front claw 53 of the seat inner shell 18 is hooked and engaged with the engagement hole 55 of the seat outer shell 7 while being fitted into the square engagement hole 50, and thus the seat inner shell 18 cannot be detached from the seat outer shell 7. Attached to.

  As shown in FIGS. 6 and 7, a pocket portion 58 for storing the instruction manual 57 is formed on one side of the seat outer shell 7 with the upward frame portion 7 a interposed therebetween. In addition, a lever (not shown) attachment portion 59 for adjusting the front-rear position of the seat 2 is formed on the opposite side of the pocket portion 58 across the upward frame portion 7a. In FIG. 6, reference numeral 60 denotes a rib protruding upward.

  For example, as shown in FIG. 8, the seat inner shell 18 is formed with a group of a large number of deformation promoting slits 61 so as to be elastically deformed in a state of being fitted to a human buttocks. A downward rear leg 54b is formed at the rear of the seat inner shell 18.

  Further, an upward bank 62 is formed on the outer peripheral edge of the seat inner shell 18 so as to extend over the entire circumference, and a flange extending outward in the front-rear direction at the upper ends of the front end and the rear end of the bank 62. 63, thereby forming a stepped portion 64 that is stepped upward at the front portion and the rear portion of the seat inner shell 18, and the stepped portion 64 is wrapped by the edge portion of the cushion material 19. In other words, the stepped portion 64 of the seat inner shell 18 is embedded in the cushion material 19.

  The front portion of the seat inner shell 18 is curved downward, so that the bank portion 62 is also positioned below the front portion of the seat inner shell 18 following the curvature. On the other hand, the rear end portion of the seat inner shell 18 is flat.

  The peripheral edge portion of the skin material 20 that covers the cushion material 18 is wound around the lower surface side of the seat inner shell 18. Then, as shown in FIG. 14B, a cylindrical portion 20a is formed by sewing or the like, and a single string (or a wire) 65 is passed through the cylindrical portion 20a, and the string 65 is pulled and both ends thereof are pulled. (The binding portion is indicated by reference numeral 65a in FIG. 13), the peripheral portion of the skin material 20 is narrowed down so that the length thereof is shortened.

  And the front-and-rear foot bodies 54a and 54b and the receiving part 49 of the seat inner shell 18 are formed with hook-like holding parts 66 into which the cylindrical part 20a of the skin material 20 is fitted from the outside. That is, the holding portions 66 are scattered along the outer periphery.

  Now, for example, a person who sits may move upwards while applying friction by applying a palm to the skin material 20 at the front end of the seat. Then, as shown by the white arrow in FIG. The front part of the material 20 is turned over from the seat inner shell 18. However, since the stepped portion 64 that is stepped upward is formed at the front portion of the seat inner shell 18, the flange portion 63 (stepped portion 64) serves as a stopper against the upward movement of the cushioning material 20, and as a result, the cushioning material 20 Can prevent drowning.

  The step portion 64 may be formed over the entire circumference of the seat inner shell 18, but the inventors of the present application have experimented, and it is possible to obtain a sufficient squeezing prevention effect simply by providing the entire length of the front portion and the rear portion. did it. In addition, it is also possible to make the cushion material 20 not include the bank portion 62 in the left and right side edge portions of the seat inner shell 18.

  When the front portion of the seat inner shell 18 is curved (or bent) obliquely downward in a longitudinal sectional view, it is not always necessary to form the bank portion 64 in the downward curved portion, and FIG. It is also possible to form the forward-facing flange 63 directly with the stepped portion 64 as shown in FIG.

  As in this embodiment, when the holding portions 66 in which the cylindrical portions 20a of the skin material 20 are fitted on the lower surface of the seat inner shell 18 are scattered along the circumferential direction, the skin material 20 can be accurately positioned and the string 65 It is possible to prevent the tube portion 20a from being broken due to excessive pulling, and to prevent the tube portion 20a from being accidentally pulled and pulled.

  In this case, when the holding portion 66 is formed on the legs 54a and 54b extending long in the left-right direction as in the embodiment, there is an advantage that the skin material 20 can be positioned more accurately. Further, by forming the legs 54a and 54b into a shape that is gently curved in the bottom view along the outer peripheral shape of the seat inner shell 18, the peripheral portion of the skin material 20 can be narrowed as evenly as possible, and as a result, the skin material It is also possible to prevent or remarkably suppress wrinkling due to 20.

(3) Covers Next, covers will be described with reference to FIGS. 15 to 20 in addition to FIG. 15 is an exploded perspective view similar to FIG. 5, FIG. 16 is an exploded perspective view with the back cover 33 turned upside down, FIG. 17 is a perspective view of the side cover 68, and FIG. 18 is a separation of the covers 33, 34, and 68. 19A is a plan view showing a connection state of the covers 33, 34, and 68, FIG. 19B is a sectional view taken along the line BB of FIG. It is.

  The back cover 33 includes a bottom plate 33a and a peripheral wall 33b that cover the tilting frame 10 and the gas spring 36 from below and behind at a portion rearward of the bridge member 28, and an upright portion 33c that surrounds the back column 12 on the peripheral wall. Are connected together. The standing portion 33c is provided with a catch (claw) 69 that fits between the left and right back struts 12 against elasticity. Further, the back cover 33 includes vertical ribs 70 that cover the back column 12 from the left and right sides. The upper end of the back cover 33 is fixed to the back inner 32 with screws.

  On the other hand, the center cover 34 fits into the opening edge of the peripheral wall 33b of the back cover 33 in plan view, and the planar shape is substantially the same as the bottom plate 33a of the back cover 33. At the front end edge of the bottom plate 33 a in the back cover 33, a stepped portion 71 is formed where the front wall portion 34 a of the center cover 34 overlaps. Further, a support portion 72 on which an edge portion of the center cover 34 is placed is formed on the peripheral wall 33 b of the back cover 33.

  The center cover 34 and the back cover 33 are fixed by screws 73. For this reason, the center cover 34 is formed with a countersink cylinder portion 74 that hides the head of the screw 73, and the bottom plate 33a of the back cover 33. A screw cylinder 75 into which a screw 73 is screwed is formed.

  The center cover 34 is formed with a rearward opening 76 that fits with the left and right vertical ribs 70 of the back cover 33, and a downward stopper 77 is formed at both left and right ends of the center cover 34. The left and right receiving portions 72 of the cover 33 are formed with notches 78 into which the stopper portions 77 are fitted. For this reason, the center cover 34 and the back cover 33 are held so that they cannot be displaced in the horizontal direction. The front surface of the center cover 34 is in close contact with or in close contact with the rear end of the bridge member 28.

  The left and right end portions of the bridge member 28 are projecting portions 28a extending to the outside of the left and right tilting frame 10, and side covers 68 are fitted to the left and right tilting frames 10 from the left and right outer sides so as to cover the projecting portions. ing. The left and right projecting portions 28a of the bridge member 28 and the tilting frame 10 have screw holes 80 for fixing the connecting bracket 79 of the armrest 4 with screws.

  The side cover 68 has a substantially U-shaped cross-section that covers the tilting frame 10 from the lateral direction, and the front end is closed and the rear end is open. For example, as shown in FIG. 18 and FIG. 19, a holding portion is attached to the front end portion of the side cover 68 as an example of a front locking means that is fitted on the front end portion of the tilting frame 10 and is held so as not to be laterally displaced outward. 81 is formed and fitted into the tilting frame 10 from the front side in a tilted position in plan view.

  The rear end portion of the side cover 68 is brought into contact with the left and right front end portions of the back cover 33. For this reason, the outer peripheral surface of the back cover 33 and the outer surface of the side cover 68 are smoothly continuous.

  For example, as can be easily understood from FIG. 19, an upward step 82 that overlaps the bottom plate 33 a of the back cover 33 is formed on the rear lower surface of the side cover 68, and the center cover 34 is formed on the rear upper surface of the side cover 68. A downward stepped portion 83 that overlaps the front end edge of the side cover 68 is formed, and an engaging claw 84 is provided at the rear end of the side wall of the side cover 68 as an example of a rear locking means for holding the rear portion of the side cover 68 so that it cannot be removed laterally. On the other hand, on the inner surface of the front end portion of the peripheral wall 33b of the back cover 33, a locking portion 85 is formed to which the locking claw 84 is hooked and engaged.

  Thus, the side cover 68 and the back cover 33 are held so that they cannot be displaced forward and backward by the engagement of the locking claws 84 and the locking portions 85, and the back cover 33 and the center cover 34 are fastened with screws 73 in this state. In other words, since the three covers 33, 34, 68 are held in a state where the side cover 68 is held by the back cover 33 so that it cannot be removed outward, the three covers 33, 34, 68 are As a whole, it is held together without play. Note that locking claws may be formed on the back cover 33 and locking portions may be formed on the side cover 68.

  By the way, the member located behind the support base in the chair is often covered with a cover, and in this case, the cover is generally attached to the back column. As a mounting method, fixing by screws or a claw that is elastically deformed or snap engagement is frequently used.

  On the other hand, there are cases where there is only one cover and a plurality of covers, and if there are a plurality of covers, for example, the entire group of members can be covered completely, the appearance is good, and the protection function is excellent. There are advantages.

  However, in the case of a plurality of covers, if each cover is fastened to the back strut with a screw or attached to the back strut (or tilting frame) using a locking claw, the processing accuracy can be improved. If it is bad, the screw screw hole and the mounting hole may be misaligned, or the position of the engaging claw and its engaging portion (engaging hole or the like) may be misaligned, making it impossible to mount.

  The cover mounting structure in the present embodiment is designed to solve the above-described problems, and the covers 33, 34, and 68 are manufactured to have a constant size and a constant shape by resin injection molding. Regardless of the processing accuracy of the frame 10 and the back column 12, the whole can be attached in an integrated state.

(4). Armrest Mounting Structure As shown in FIG. 20, the armrest 4 is provided with a pipe elbow support 87, and an elevator body 88 is attached to the elbow support 87 so that the height thereof can be adjusted. A pad 89 is attached so as to be pivotable horizontally. The elevating body 88 is provided with a lever 90 for unlocking, and the lock is released by holding the elevating body 88 with a hand and pulling the lever 90. Needless to say, the elbow rest 89 is not limited to a movable type but may be a fixed type.

  The lower part of the elbow support 87 is a horizontal portion 87a, and the connecting fitting 79 is fixed to the tip of the horizontal portion 87a by welding or the like. The connecting bracket 79 includes an upper overlapping portion 79a, a lower overlapping portion 79b, and a vertically long portion that connects them, and is formed in a stepped shape when viewed from the front.

  The connecting bracket 79 of the armrest 4 overlaps the side cover 68 from below, and the connecting bracket 79 and the side cover 68 are fixed to the tilting frame 10 and the bridge member 28 by three screws screwed from below. Has been. On the upper surface of the connecting bracket 79, a locking piece 79c that overlaps the protruding portion 28a of the bridge member 28 is provided by bending (may be welded), while the portion 68a of the side cover 68 that covers the bridge member 28 is locked to the locking member 79c. A notch (relief hole) 91 into which the piece 79c is fitted is formed.

  For this reason, the armrest 4 is held in a predetermined mounting posture even if it is not grasped by one hand by overlapping the locking piece 85 on the protruding portion 28a of the bridge member 28 at the position of the notch 91. For this reason, the operator becomes free of both hands, and the result is that the armrest can be attached efficiently.

It is a side view of the chair concerning a 1st embodiment. FIG. 3 is an exploded perspective view of main members constituting the support mechanism. (A) is a vertical side view of a seat part, (B) is a perspective view of a bearing bush. FIG. 4 is a plan view taken along line IV-IV in FIG. 3. It is a perspective view which shows the support mechanism of a backrest. It is a top view of a seat outer shell. FIG. 7 is a sectional view taken along the line VII-VII in FIG. 6. It is a bottom view of a seat inner shell. It is a separation vertical side view of a seat outer shell and a seat inner shell. It is a vertical side view in the state where the seat inner shell was attached to the seat outer shell. It is sectional drawing which looked at the attachment state of a seat inner shell in the XI-XI view location of FIG.6 and FIG.9. FIG. 12 is a sectional view taken along line XII-XII in FIG. 11. It is a bottom view of the seat in the state where the cushion material was stretched. (A) is a sectional view taken along line XIV-XIV in FIG. 13, and (A) is a partially enlarged view of (B). FIG. 6 is an exploded perspective view similar to FIG. 5. It is a separation perspective view in the state where the back cover was turned over. It is a perspective view of a side cover. It is a separation top view of each cover. (A) is a top view which shows the connection state of each cover, (B) is BB sectional drawing of (A). It is a perspective view of an armrest.

Explanation of symbols

1 leg 2 seat 3 backrest 10 tilting frame 12 back strut 18 seat inner shell 19 cushion material 20 skin material 20a tubular portion 62 bank portion 63 flange 64 step portion 65 string

Claims (4)

It is provided with an inner shell made of synthetic resin, a cushion material superimposed on the inner shell, and a skin material covering the cushion material from the surface side, so that the peripheral edge of the cushion material overlaps with the outer peripheral surface of the inner shell. And the peripheral portion of the skin material is a seat or a backrest that is caught on the back side of the peripheral portion of the inner shell,
A stepped portion is formed on a part or all of the outer periphery of the inner shell toward the seated person, and the stepped portion is wrapped with the cushion material.
Chair seat or backrest. On the outer periphery of the inner shell, a bank portion protruding toward the seated person is formed so as to extend over substantially the entire circumference, and the stepped portion is formed by forming an outward flange at the tip of the bank portion. And
A chair seat or backrest according to claim 1. The cushion material is formed separately from the inner shell and overlaps the inner shell without being bonded, while the outer peripheral portion of the skin material is formed with a cylindrical portion extending over substantially the entire circumference. , By binding the single string member or wire passed through the cylindrical part and narrowing the cylindrical part, the peripheral part of the skin material is held on the back side of the peripheral part of the inner shell,
The seat or backrest of the chair according to claim 1 or 2. On the back side of the peripheral portion of the inner shell, a hook-like holding portion into which the cylindrical portion of the skin material is fitted from the outside is formed in a circumferential manner at appropriate intervals.
A seat or back of the chair according to claim 3.

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