JP2005152102A - Chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of members and speed up assembly work in mounting a lever for adjusting the lengthwise position of a seat. <P>SOLUTION: An undershell 7 made of a synthetic resin is mounted to a seat receiving metal fixture 8 in such a way as to move forward and backward, and a seat plate 19 is mounted to the undershell 7. A plurality of notch grooves 64 are formed in the seat receiving metal fixture 8 along the lengthwise direction at appropriate intervals. The lever 63 to be engaged with or disengaged from the notch grooves 64 is mounted to a holding part 68 formed in the upper surface of the undershell 7. The holding part 68 is provided with a pair of catch claws 67, and the catch claws 67 are held by stoppers 69 provided at the seat plate 19 in such a way as not to be deformed. The undershell 7 has a trough-shaped restricting part 74 for restricting lengthwise deviations of a fastening part 63a of the lever 63. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a chair.

  A chair is often provided with a lever operated by a person. For example, a lever for operating a gas cylinder that adjusts the seat height, a lever for switching the backrest to a free state in which the backrest can be freely tilted, and a locked state in which the backrest cannot be tilted, and a back tilt angle for switching the backrest A lever or a lever for adjusting the front-rear position of the seat can be mentioned.

In Patent Document 1, in a chair in which a seat is attached to a seat receiving frame so as to be able to move back and forth, a plurality of engagement holes are formed at appropriate intervals in the front and rear direction in the longitudinal side frame portion of the seat receiving frame, It is described that a support member for rotatably holding a lever is fixed to the lower surface of the seat plate with a screw.
JP 2001-186554 A

  When a lever for adjusting the front / rear position of the seat is provided as in Patent Document 1, the operability is excellent compared to the case where the operation portion is integrally formed on the seat plate as in JP 2003-135196 A, for example. It can be said. However, in Patent Document 1, since a member for mounting the lever must be prepared separately and screwed, this increases the number of members and increases the cost, and it takes time to assemble the chair. There is.

  An object of the present invention is to solve such a problem.

  The invention of claim 1 is provided with a lever for adjustment or switching, such as adjustment of the front / rear position of the seat or rearward tilt angle adjustment of the backrest, and the lever is provided with a finger-hanging portion to constitute the chair. A holding portion is integrally formed on a resin member such as a shell shape or a frame shape so that the lever is not detached.

  According to a second aspect of the present invention, in the first aspect, the lever is made of a bar material and is pivotable, and includes a pivot shaft portion having a pivot shaft. While the engaging portion that is engaged with and disengaged from the engaging portion formed on the member is bent, the holding portion is elastically deformed when the pivot shaft portion of the lever is pushed in from the direction orthogonal to the axis, and rotates. It consists of a pair of catch claws that sandwich and hold the moving shaft part, and a receiving part that supports the rotating shaft part pushed between the pair of catch claws.

  The chair according to the invention of claim 3 is made of a seat bracket, a synthetic resin undershell having an upward opening attached to the seat bracket so as to be movable back and forth, and a synthetic resin supported by the undershell. The lever is for adjusting the front-rear position of the seat, and further embodies the invention of claim 2.

  That is, in claim 2, the pivot shaft portion of the lever is located on the upper surface side of the undershell and extends in the front-rear direction, and the holding portion is disposed on the upper surface of the undershell and the pivot shaft portion of the lever. Is formed so as to be fitted by pressing from above, and an operation portion exposed to the outside through a first window hole formed in the undershell is connected to one end portion of the rotating shaft portion of the lever. A finger hook is attached to this, and the other end of the rotating shaft is bent and formed with a locking portion that extends toward the seat bracket through a second hole formed in the undershell. In addition, a plurality of engaging portions are formed in the seat receiving metal fittings at appropriate intervals along the front-rear direction so that the engaging portion engages and disengages when the lever rotates.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the seat plate is provided with a stopper projecting downward so as to prevent the pair of catch claws from bending and deforming in the direction to open each other. According to a fifth aspect of the present invention, in the third or fourth aspect of the invention, the undershell includes a restriction portion that holds the lever so that the lever cannot be moved back and forth in a state where the engaging portion is engaged with the engaging portion of the seat bracket. Are integrally formed.

  According to the present invention, since the holding portion of the lever is integrally formed with the resin member, the number of members can be reduced, the cost can be suppressed, and the efficiency of assembling the chair can be improved.

  According to the second aspect, since the lever can be attached by a one-touch operation of pushing into the holding portion, the efficiency of the chair assembling operation can be further improved.

  According to the third aspect of the present invention, since the pivot shaft portion of the lever is hidden between the undershell and the seat plate, in other words, the undershell serves as a cover for the lever, so that the appearance is excellent.

  According to the structure of claim 4, even if the catch claws are formed so as to be easily bent and deformed, the catch claws can be prevented from being deformed during use of the chair and the lever can be prevented from being detached. Therefore, the mounting strength of the lever can be ensured. In addition, breakage of the catch claws can be prevented.

  In a chair that can adjust the front and back position of the seat, for example, when a seated person leans against the backrest, an external force that tries to move forward acts on the seat, and thus an external force that pushes the lever forward also acts. Therefore, it is necessary to hold the lever so as not to move forward.

  In this respect, if the structure as in claim 5 is used, the presence of the restricting portion provided in the undershell can prevent the lever from moving back and forth without imposing a burden on the catch claw, so that the holding portion has an excessively strong structure. Without holding the lever firmly.

  Next, embodiments of the present invention will be described with reference to the drawings. 1 to 15 show the first embodiment. First, this point will be described.

(1). Basic structure of a chair FIG. 1 is a side view of a chair, and as shown in this figure, the chair includes a leg 1 with a caster, 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 supported by a seat bracket 8 through an undershell (which may be called an outer shell) 7, and the front end of the seat bracket 8 is connected to the front end of the support base 6 by a first shaft 9. It is attached so that it can be tilted backward and backward.

  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 of FIG. 3A, and FIG. It is a separate perspective view of the member related to this.

  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 receiving frame 8 and the shafts 9 and 14 constitute a seat receiving frame 17. Since both the shafts 9 and 14 are welded to the seat receiving bracket 8, the seat receiving frame 17 has a light but strong structure.

  The seat bracket 8 is formed with a flange 8a extending outward in the left and right directions, and the undershell 7 is attached to the flange 8a so as to be movable back and forth (details will be described later). As shown in FIG. 3A, the seat 2 has a structure in which a cushion 20 is stretched on a synthetic resin seat plate (inner shell) 19.

  For example, as shown in FIG. 5, the tilting frame 10 is formed in a groove shape that opens to the left and right, 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 21 welded thereto.

  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 need to be arranged in pairs on the left and right, and may be one. Of course, the cross-sectional shape can be freely set. 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 22 is disposed on the front side of the front wall 15a, and the spring 23 is disposed from the rear. I support it.

  In the first shaft 9, the left and right front bushes 24 and the front spring receiver 25 sandwiched between the two are fitted in a portion inside the support base 6. As shown in FIG. 3 (B), the left and right front bushes 24 are formed in a substantially U shape with a lateral opening, and are fitted in a slit 16 formed in the support base 6 so as not to move left and right. The first shaft 9 is fitted in the rear opening groove of the front bush 25 so as to be movable back and forth. Note that the flot bush 24 may be a vertical separation system.

  The left and right front bushes 24 and the front spring receiver 25 are U-shaped with a forward opening in a side view, and are fitted tightly inside the front metal fitting 26 made of a metal plate, and the front metal fitting 26 and the left and right front bushing 24 are screwed. 27 (see FIG. 4). The second shaft 11 is fastened to the lower surface of the support base 6 with a screw 30 via a center bush 28 and a center metal fitting 29.

  The third shaft 14 is connected to a bridge member 31 disposed so as to span the left and right tilt frame 10 by a pair of left and right synthetic resin rear bushes 32 and rear metal fittings 33. The bridge member 31 is fixed to the tilting member 10 by welding. For this reason, the left-right tilting member 10 is firmly connected.

  When the backrest 3 tilts backward, the seat 2 also interlocks and moves backward while retracting. However, in order to regulate the rearward tilt angle of the backrest 3 and the seat body 2, as shown in FIG. A stopper 34 with which the shaft 14 abuts at the lower limit is provided.

  In FIG. 5, reference numeral 35 denotes a synthetic resin inner plate constituting the backrest 3, reference numeral 36 denotes a back cover, and reference numeral 37 denotes a center cover. The center cover 37 is configured to cover the tilting frame 10 and the space between the tilt frame 10 and the rear portion of the bridge member 31.

  As shown partially in FIGS. 3 and 5, a gas spring 38 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 is disposed behind the support base 6 so as to extend in the front-rear direction. doing.

  A front end portion of the gas spring 38 is attached to a U-shaped bearing bracket 39 fixed to the rear surface of the support base 6 by a horizontal pin 40 so as to be vertically rotatable. Further, the gas spring 38 is pivotally supported by the lower connection fitting 20 of the back frame 12 via the rear end portion of the gas spring 38, the head fitting 41 and the bearing fitting 42. The tilt frame 10 is provided with a lever for operating the gas spring 38, but this is omitted.

(2). Undershell and Seat Plate Next, the undershell 7 and the seat plate 19 will be described mainly with reference to FIGS.

  6A is a plan view of the undershell 7, FIG. 7B is a sectional view taken along the line B-B of FIG. 7A, FIG. 7 is a plan view of the seat plate 19, and FIG. 7 and FIG. 9B are vertical side views of the seat plate 19 and the seat plate 19 separated from each other, FIG. 9 is a vertical side view of the seat plate 19 attached to the undershell 7, and FIG. 10 is a sectional view taken along the line XX in FIG. 9, FIG. 11 is a sectional view taken along the line XI-XI in FIG. 6, and FIG. It is sectional drawing which looked at the attachment state of the shell 7 in the XII-XII view location of FIG.

  The undershell 7 and the seat plate 19 are made of synthetic resin (for example, both made of polypropylene), and are each formed in a concave shape upward in a front view. 8, 11, and 12, there is a space between the undershell 7 and the seat plate 19 in a state where the outer periphery of the seat plate 19 is applied to the outer periphery of the undershell 7. ing. For this reason, when a person is seated, the seat plate 19 can be elastically deformed and sink. As shown in FIG. 8, a rear projection 44 for reinforcement is provided at the rear portion of the seat plate 19 at the rear portion of the seat plate 19, and the rear projection 44 enters the inside of the undershell 7.

  An upward frame portion 7a of a width dimension that covers the seat receiving bracket 8 is formed in a substantially front half portion of the undershell 7 and along the longitudinal longitudinal center line, and the under shell 7 and the seat receiving bracket 8 are formed. Is made as close as possible, and the lowest lower limit height of the seat 2 is lowered so that a person with a short height can use it easily. Of course, the upward frame portion 7a can be eliminated by providing a space between the entire seat receiving bracket 8 and the undershell 7.

  On the lower surface of the undershell 7, a group of guide claws 45 that embrace the flange 8 a of the seat bracket 8 is formed. For this reason, the undershell 7 is held so as not to move upward and to the left and right, and the front and rear positions of the undershell 7 and the seat 2 can be adjusted (adjustment means for the front and rear positions will be described later).

  As a method of attaching the seat plate 19 to the undershell 7, first, as shown in FIGS. 9 and 10, for example, as shown in FIG. 9 and FIG. While a plurality of projections are provided at intervals, the seat plate 19 is formed with a recess 47 in which the locking claw 46 is loosely fitted and a stepped receiving portion 48 positioned on the front side of the recess 47.

  Therefore, when the seat plate 19 is shifted rearward with the recess 47 fitted in the locking claw 46, the receiving portion 48 of the seat plate 19 engages with the locking claw 46 of the undershell 7, and the seat plate 19 is It is held immovable upward from the undershell 7.

  As a means for holding the seat plate 19 to the front side so as to be immovable, a pair of left and right square engagement holes 49 are formed in the front portion of the top plate of the upward frame portion 7a in the undershell 7, while the seat plate 19 The angle-shaped stopper portion 50 is formed so as to be fitted into the square engagement hole 49 and viewed downward from the side. The stopper part 50 is surrounded by a slit 50a having a U-shaped rearward opening in a plan view. Therefore, the stopper part 50 can be bent and deformed in the vertical direction.

  As shown in FIGS. 3 and 6A, a front engagement hole 51 is formed in the front end portion of the upward frame portion 7a in the undershell 7 and in the left and right intermediate portions, while the front engagement hole 51 is formed on the lower surface of the front portion of the seat plate 19. Are integrally provided with a front claw 52 that fits into and engages with the engagement hole 51 and a foot 53 that contacts the upper surface of the undershell 7. For this reason, the front part of the undershell 7 and the front part of the seat plate 19 are held inseparable.

  Note that a skin material (not shown) such as a cloth is stretched on the cushion 20, and this skin material is wound around the lower surface of the seat plate 19. The entrainment part is covered with the undershell 7 from below. For this reason, the edge of the skin material is not exposed and the appearance is good.

  When the receiving portion 48 of the seat plate 19 is engaged with the locking claw 46 of the undershell 7 and then the front portion of the seat plate 19 is pushed downward, the stopper portion 50 is deformed against elasticity and then is engaged in a square shape. In addition to being fitted into the hole 49, the front claw 52 of the seat plate 19 is hooked and engaged with the front engagement hole 51 of the undershell 7, whereby the seat plate 19 is attached to the undershell 7 with no backlash.

  When removing the seat plate 19, the front pawl 52 is pulled forward with the fingertip to release the engagement with the front engagement hole 51, and then the fingertip is applied to the front portion of the seat plate 19 to raise the stopper. The part 50 may be detached from the rectangular engagement hole 49, and then the seat plate 19 may be pulled forward.

  A large number of slit groups are formed in the seat plate 19 so as to be elastically deformed in a state of being fitted to a human buttocks. That is, it is composed of a group of center slits 54 extending in the front-rear direction, a group of intermediate slits 55 positioned on the left and right outer sides thereof, and a group of side slits 56 disposed on the left and right outer sides thereof. The center slit 54 and the side slit 56 extend in the front-rear direction, and the group of intermediate slits 55 extends in an inclined manner.

  The slits 54 to 56 are formed at a high density at the portion where the seated person's buttocks abut, so that the portion where the body pressure acts strongly sinks and deforms more greatly. Since the front part of the seat plate 19 hardly sinks and is not deformed, there is no problem even if there is only a little clearance from the upward frame part 7a of the undershell 7 (or even if it touches the upward frame part 7a).

  As shown in FIG. 6, a pocket portion 58 for storing a piece of paper 57 such as an instruction manual or a warranty card is formed in the inclined portion of the undershell 7. The pocket portion 58 includes a bottom piece (mounting piece) 59 having a mountain shape in plan view and a top piece (pressing piece) 60 having a mountain shape in plan view. The seat inner shell 7 is formed by using a die cut-out in manufacturing the injection molding method, and therefore does not overlap in plan view. At the base portion of the upper piece 60, a hole 61 is formed for inserting a finger to push the paper pieces 62 outward.

  As described above, the seat plate 19 is most greatly depressed and deformed at the portion where the seated person's buttocks abut, and this deformation provides cushioning and fit. The seat plate 19 does not deform indefinitely, but as shown by a one-dot chain line in FIG. 12, if it is deformed to a certain extent, it hits the undershell 7, so that the seat plate 19 is not plastically deformed or broken. Further, since the seat plate 19 is supported by the undershell 7 in a wide area, there is no rugged feeling when the seat plate 19 hits the undershell 7, and the fitting property is not impaired.

  As described above, in order to make the lower limit height of the seat 2 as low as possible, the front end of the support base 6 slightly protrudes from the upper surface of the seat bracket 8 (see FIG. 3). For this reason, if it fits in the flange 8a of the seating metal fitting 8 in order from the guide claw 45 of the rear end in the undershell 7, the undershell 7 will hit the upper end of the support base 6 on the way.

  Therefore, as shown in FIG. 4, the flange 8a of the seat bracket 8 is formed with notches 8b in which the rear three guide claws 45 in the undershell 7 can escape from above, and the rear three The guide claws 45 are positioned below the upper surface of the seat bracket 8 at the notches 8b, and then the undershells 7 are moved backward to hold the flanges 8a of the seat bracket 8 with the guide claws 45. Is allowed.

  Therefore, the front-rear length L2 (see FIG. 4) of the notch 8b of the seat receiving bracket 8 is larger than the front-rear distance L1 (see FIG. 6) of the rear three guide claws 45 in the undershell 7, and the seat The front-rear length L4 of the portion in front of the notch 8b in the bracket 8 is set to be smaller than the interval dimension L3 between the groups of the three front and rear guide claws 45 in the undershell 7.

  As described above, in the present embodiment, the seat receiving frame 8 and the first and third shafts 9 and 14 form an integrally structured seat receiving frame 17, and each of the shafts 9, 11 and 14 includes two. Since it is attached with a split type bush pair and a metal fitting for holding and fixing it, the assembling work can be speeded up as compared with the case where the shaft is inserted into the bearing hole to prevent it from coming off.

(3). Front / rear position adjustment means of the seat Next, the front / rear position adjustment means of the seat 2 will be described with reference to FIGS. 13 is a separated plan view, FIG. 14 is a plan view with some members separated, FIG. 15A is a perspective view of the lever 63, and FIG. 13B is a sectional view taken along line BB in FIG. ) Is a cross-sectional view taken along the line CC in FIG. 14, (D) is a cross-sectional view taken along the line DD in FIG. 14, (E) is a cross-sectional view taken along the line EE in (D), and (F) is an F view in (D). FIG.

  In the present embodiment, as an example of the engaging portion, a plurality of (four in the figure) notch grooves 64 that open outwardly are formed in the flange 8a of one seat receiving bracket 8 (left seat receiving bracket in front view). Then, the front and rear position of the seat 2 can be adjusted by fitting / removing the locking portion 63a of the lever 63 into / from an arbitrary notch. The tip of the locking part 63a is formed in a flat shape.

  The lever 63 is made of a round bar (wire), and has a rotating shaft portion 63b extending in the front-rear direction, a front downward portion 63c extending downward from the front end of the rotating shaft portion 63b, and an outer side from the lower end of the front downward portion 63c. An operation portion 63d extending in the direction and a rear downward portion 63e extending downward from the rear end of the rotation shaft portion 63b. A locking portion 63a is formed on the rear downward portion 63e, and is combined with the operation portion 63d. A resin grip (finger holding portion) 65 is attached.

  The rotating shaft 63b is supported from below by a plurality of front and rear receiving portions 66 projecting upward from the undershell 7, and is held in a state in which it does not move upward by a pair of catch claws 67 projecting from the undershell 7. ing. Therefore, in this embodiment, the holding part 68 is comprised by the receiving part 66 and the catch nail | claw 67 which were mutually formed and formed.

  Two pairs of catch claws 67 are arranged at the front and rear. When the rotating shaft 63b is applied to the catch claw 67 and pressed from above, the pair of catch claws 67 are elastically deformed so as to increase the distance between them, so that the rotating shaft 63b fits between the catch claws 67. Thus, the lever 63 is attached to the holding portion 68.

  It is possible to integrally form the receiving portion between the pair of catch claws 67, but if the receiving portion 66 and the catch claws 67 are separated as in this embodiment, the vertical length of the catch claws 67 is increased. Thus, the bending deformation can be made easy, so that the mounting operation of the lever 63 can be performed with a light force, and the catch claw 67 can be prevented from being damaged.

  As shown in FIG. 15B, the seat plate 19 is provided with a pair of left and right stoppers 69 projecting downward from the left and right outer sides so as to sandwich the pair of left and right catch claws 67 from the outside. For this reason, the catch claws 67 are prevented from being deformed so that the distance between them is widened, and even if a large force is applied to the lever 63, the rotating shaft portion 63b does not come off from the catch claws 67. 67 is not damaged. In order to allow the sinking deformation of the seat plate 19, there is a gap between the stopper 69 and the upper surface of the undershell 7 in the non-sitting state.

  The undershell 7 has a first window hole 70 for exposing the operating portion 63 d of the lever 63 below the undershell 7 and a second window for exposing the locking portion 63 a of the lever 63 below the undershell 7. A window hole 71 is formed.

  A standing piece 72 that rises from the edge of the second window hole 71 is formed in the undershell 7, and a locking portion 63 a of the lever 63 is pushed by a coil spring 73 supported by the standing piece 72. A spring receiver 72 a is formed on the standing piece 72. In addition, as an urging means of the lever 63, a spring of another form such as a torsion spring may be used, and the arrangement location can be freely set.

  As shown in FIGS. 15B, 15 </ b> E, and 15 </ b> F, the undershell 7 is integrally formed with a hook-shaped restricting portion 74 that holds the locking portion 63 a of the lever 63 so as not to move back and forth. . Therefore, for example, even if a strong force is applied to the seat 2 so as to move the seat 2 forward when the seated person leans against the backrest 3, the lever 63 does not move and the durability does not deteriorate.

  Since the locking portion 63a of the lever 63 extends downward from the rotating shaft portion 63b, when an external force is applied to push the seat 2 in the front-rear direction, a moment in the front-rear direction acts on the locking portion 63a. Therefore, an external force that raises this upward acts on the rotation shaft portion 63b. Therefore, when the movement of the lower end of the locking portion 63a is restricted by the restriction portion 74 as in the present embodiment, it is possible to remarkably suppress the moment from acting on the locking portion 63a and to accurately secure the holding function of the lever 63. Is an advantage.

  As indicated by the alternate long and short dash line in FIG. 15 (F), it is possible to form a restricting portion 74 for the locking portion 63 a on the upper surface of the undershell 73. Of course, the restricting portion 74 may be provided above and below the undershell 7.

  As can be easily understood from the drawing, when the finger hooking portion 65 is pulled upward, the lever 63 rotates about the axis of the rotating shaft portion 63b, and the locking portion 63a is detached from the notch groove 64 of the seat receiving bracket 8. Thereby, the front-rear position of the seat 2 can be freely changed.

  It is possible to project the holding portion 68 downward on the lower surface of the undershell 7 so that the entire lever 63 is disposed below the undershell 7. If it arrange | positions at the upper surface side of the shell 7, the lower surface of the undershell 7 can be refreshed and it is excellent in aesthetics. It is also possible to prevent the lever 63 from moving back and forth using the first window hole 70.

(4). Second to fifth embodiments (FIGS. 16 to 19)
FIG. 16 shows a second embodiment. (A) is a schematic plan view, (B) is a BB view sectional view of (A).

  In this embodiment, the engaging portion 63a is formed in a crank shape, the rotating shaft portion 63b is formed on both sides of the engaging portion 63a, and both the rotating shaft portions 63b are attached to the holding portion 68. Yes. One turning shaft portion 63b is formed with an outward bent portion 63e, and a finger hook portion (not shown) is attached thereto. On the other hand, the seat bracket 8 is provided with a downward side plate 8c, and a group of cutout grooves 64 into which the locking portion 63a is fitted and removed from below is formed on the side plate 8c.

  The third embodiment shown in FIG. 17 is another example of the form of the lever 63, and the locking portion 63a is fixed to the rotating shaft portion 63b by welding. The holding part is omitted.

  In the fourth embodiment shown in FIG. 18, a finger hooking portion 65 is attached to one end of the rotating shaft portion 63b, and a locking portion 63a is bent at the other end of the rotating shaft portion 63b. In the figure, the holding portion and the regulating portion are omitted.

  In the fifth embodiment shown in FIG. 19, the lever 63 is a slide type. The present invention can also be applied to such a slide-type lever 63. The holding part and the regulation part are omitted.

(5). Sixth to seventh embodiments (FIGS. 20 to 21)
20 and 21 show another example of the seat portion. In both of these, a lower cushion layer 76 is provided on the lower surface of the seat plate 19, and in the sixth embodiment shown in FIG. 20, the lower cushion is placed between the seat plate 19 and the undershell 7 in a state before seating. On the other hand, in the seventh embodiment shown in FIG. 21, there is a space between the seat plate 19 and the undershell 7 in the state before sitting.

  When the lower cushion layer 76 is provided in this manner, the seat plate 19 is gradually stopped from being deformed, so that it can be said that the cushioning property is excellent. The lower cushion layer 76 may be simply placed on the upper surface of the undershell 7.

(6). Advantages of Seat Support Mechanism in Embodiment As described above, in Patent Document 1, the seat inner shell is attached to the seat frame so that the seat can be moved back and forth. However, this causes a problem that a separate cover for covering the seat inner shell from below is required, and a problem that the lateral width of the seat frame must be increased.

  On the other hand, when the undershell 7 having a rigid structure is attached to the seat bracket 8 so as to be movable back and forth and the seat plate 19 is attached to the undershell 7 as in the present embodiment, the lateral width of the seat bracket 8 is increased. Since the seat 2 can be made as small as possible, the support mechanism of the seat 2 becomes compact, and the undershell 7 has the advantage of being excellent in aesthetics because it also serves as a cover that covers the seat plate 19. Moreover, since it can prevent with the undershell 7 that the seat board 19 sinks excessively and deform | transforms, there also exists an advantage which does not require a special member.

(7). Others The present invention can be embodied in various ways other than the above-described embodiment. For example, the lever is not limited to being made of bar material, but can be made of metal plate or synthetic resin. Moreover, it is applicable not only to the lever for adjusting the front and rear position of the seat plate but also to a lever for other purposes.

  The form of the engaging portion is not limited to the notch groove as in the embodiment, and can be embodied in various forms such as a protrusion. Of course, it can set freely according to the form of the latching part or engaging part of the lever. When applied to a lever for adjusting the front / rear position of the seat, it is sufficient that the restricting portion is formed so as to prevent the lever from moving forward.

It is a side view of the chair concerning a 1st embodiment. It is a separation perspective view of a main member. (A) is a longitudinal side view of a seat part, (B) is a perspective view of a front bush. FIG. 4 is a plan view taken along the line IV-IV in FIG. It is a separation perspective view of a tilting frame and members related thereto. (A) is a top view of the undershell 7, (B) is a BB view sectional view of (A). It is a top view of a seat board. (A) is a vertical sectional side view of the undershell and the seat plate, and (B) is a vertical side view of the seat plate attached to the undershell 7. It is sectional drawing which looked at the attachment state of a seat board in the IX-IX view location of FIG. 8 (A). FIG. 10 is a sectional view taken along line XX in FIG. 9. It is sectional drawing which looked at the attachment state of the undershell 7 in the XI-XI view location of FIG. It is sectional drawing which looked at the attachment state of the undershell 7 in the XII-XII view location of FIG. It is a separate top view which shows the attachment structure of a lever. It is a partial separation top view of the attaching part of a lever. (A) is a perspective view of the lever, (B) is a sectional view taken along line BB in FIG. 14, (C) is a sectional view taken along line CC in FIG. 14, and (D) is a sectional view taken along line DD in FIG. , (E) is an EE sectional view of (D), (F) is an FF sectional view of (D). It is a figure which shows 2nd Embodiment. It is a figure which shows 3rd Embodiment. It is a figure which shows 4th Embodiment. It is a figure which shows 5th Embodiment. It is a figure which shows 6th Embodiment. It is a figure which shows 7th Embodiment.

Explanation of symbols

1 leg 2 seat 3 backrest 6 support base 7 undershell 8 seat bracket 19 seat plate 19
63 Seat front / rear position adjusting lever 63a Lever locking portion 63b Lever pivot shaft portion 64 Notch groove as an example of engaging portion 66 Receiving portion 67 Catch claw 68 Holding portion 69 Stopper 70 First window hole 72 First 2 Window hole 74 Restriction part

Claims (5)

It is equipped with a lever for adjustment or switching such as adjustment of the front / rear position of the seat and rearward tilt angle adjustment of the backrest, and the lever is a chair provided with a finger rest,
A holding part to be attached in a state where the lever is not detached is integrally formed on a resin member such as a shell shape or a frame shape constituting the chair.
Chair. The lever is made of a rod and is pivotable, and includes a pivot shaft portion having a pivot axis, and the pivot shaft portion is engaged with an engagement portion formed on another member. While the stop is bent,
The holding portion is pushed between a pair of catch claws and a pair of catch claws that are elastically deformed when the lever's pivot shaft portion is pushed in from a direction orthogonal to the axis thereof, and holds the pivot shaft portion. It consists of a receiving part that supports the rotating shaft part,
The chair according to claim 1. The lever includes a seat bracket, an upwardly opening synthetic resin undershell attached to the seat bracket so as to be movable back and forth, and a synthetic resin seat plate supported by the undershell. Is for adjusting the front and rear position of the seat,
The rotating shaft portion of the lever is located on the upper surface side of the undershell and extends in the front-rear direction. The holding portion is placed on the upper surface of the undershell, and the rotating shaft portion of the lever is pushed in from above. While shaped to fit,
An operation portion exposed to the outside through a first window hole formed in the undershell is connected to one end portion of the rotation shaft portion of the lever, and a finger hook portion is attached to the operation portion. At the other end, a locking part extending toward the seat receiving bracket is bent through a second window hole formed in the undershell,
A plurality of engagement portions are formed at appropriate intervals along the front-rear direction in the seat bracket, the engagement portions of which engage and disengage when the lever rotates.
The chair according to claim 2. The seat plate is provided with a stopper projecting downward to prevent the pair of catch claws from bending and deforming in the direction to open each other.
The chair according to claim 3. The undershell is integrally formed with a restricting portion that holds the lever so that it cannot move back and forth with the engaging portion engaged with the engaging portion of the seat bracket.
The chair according to claim 3 or 4.

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