JP5022049B2 - Chair manufacturing method - Google Patents

Description

  The present invention relates to a method for manufacturing a rocking chair in which the backrest tilts backward against the elasticity of the rocking spring.

  In a rocking chair, a compression coil spring is often used as a means for imparting an elastic resistance to the back tilt of the backrest. There are various locking mechanisms. First, looking at the relationship between the backrest and the seat, only the backrest tilts backward against the locking spring, and the seat also tilts and retracts in conjunction with the back tilt of the backrest It is roughly divided into When viewed from the arrangement position of the locking spring, it is often arranged inside a box-shaped seat base (housing) fixed to the upper end of the leg column.

  In addition, one end and the other end of the compression coil spring are supported by spring receivers, and the locking function is exhibited by the relative movement of both spring receivers. The springs can be roughly classified into those that can adjust the initial elastic force and those that cannot. There are various adjustment means, but generally a wedge type (which may be called a cam type) is widely used, and a rotary spring (handle) is rotated to move the movable member back and forth to lock the spring. The initial elastic force is changed.

  In any case, the load acting on the backrest (and the seat) is supported by the rocking spring, but since a large load acts on the rocking spring when the person is leaning against the backrest, the rocking spring is quite suitable. Has a large elastic restoring force, and it cannot be easily compressed by human hands. For this reason, it is important that the rocking spring can be assembled in a safe state in assembling the chair (if the rocking spring jumps off, for example, from the seat base during assembling, a serious accident may occur).

  Therefore, in the chair of the type that can adjust the initial elastic force of the locking spring, the locking spring is set in the free length state by setting the locking spring in the free length state when the movable body of the spring receiver is moved back most. After setting, the knob on the spring holder is rotated to apply a load to the locking spring.

On the other hand, in the case of a chair in which the initial elastic force of the locking spring cannot be adjusted, the locking spring needs to be set in a slightly compressed state from the beginning. As a means for setting the rocking spring in a compressed state on the seat receiving base of the chair, Patent Document 1 describes a chair in which one spring receiver is supported by a pin provided on a swinging member to which a backrest is attached. In the state where the locking spring is slightly compressed in the receiving base, a temporary holding portion is formed in which one spring holder is temporarily held, and the pin is set in a state where the locking spring is supported by the temporary setting portion, Next, it is disclosed that one spring receiver is detached from the temporary placement portion and engaged with the pin.
JP 2000-139605 A

  The configuration in which the spring support is adjustable and the locking spring is set in a free length has the advantage that it can be safely incorporated.However, when using the chair, the knob must be rotated and a load must be applied to the locking spring. There was a problem that the rotation operation of was troublesome.

  On the other hand, since the method of Patent Document 1 has a very special configuration in which one of the spring receivers is detached from the temporary placement portion of the seat receiving base and the one spring receiver is fitted to the pin, the versatility is extremely low. In addition, there is a possibility that an accident may occur in which the spring receiver is detached from the temporary placement portion and the spring is scattered before the pin is set.

  The present invention has been made in view of such a situation, and provides a manufacturing method that can easily incorporate a rocking spring without taking the trouble of knob operation and is excellent in safety and versatility. It is something to be done.

  The chair to which the present invention is directed includes a seat receiving base fixed to an upper end of a leg support, a seat disposed above the seat receiving base, a back frame connected to the seat receiving base so as to be able to tilt backward, and A backrest attached to the back frame, and a slide shaft that reciprocates in a substantially front-rear direction in conjunction with tilting of the back frame, and the seat receiving base has left and right side plates and is open upward. The seat receiving base is formed with an elongated hole into which the slide shaft is slidably fitted. The slide shaft is fitted into the elongated hole via a bush, and the seat receiving base. A compression-type rocking spring that provides resistance to the slide of the slide shaft that slides in conjunction with the rearward tilting of the back frame is disposed inside.

  According to claim 1 as a method of manufacturing the chair having the above-described structure, the assembly of the slide shaft and the bushing is as follows: “The locking spring is set inside the seat receiving base, and the bush is fitted into the elongated hole of the seat receiving base. The slide shaft is fitted into the elongated hole without being inserted, and then the locking shaft is retracted until the bush can be inserted into the elongated hole to compress the locking spring, and then the locking spring is compressed. Then, after the bush is fitted into the elongated hole of the seat receiving base, the load of the locking spring with respect to the slide shaft is released ".

  According to the first aspect of the present invention, the mounting of the seat base to the leg support and the mounting of the back frame to the seat base are performed before the locking spring and the slide shaft are assembled to the seat base. It may be done later. However, in many cases, the seat is attached after the locking spring, the slide shaft, and the bush are assembled. There is no particular limitation on the order of attaching the backrest to the back frame.

  As a method of retracting the slide shaft before fitting the bush, a method of retracting the slide shaft directly by hooking the jig to the slide shaft or a method of retracting the jig by hooking the jig on the spring receiver fitted to the slide shaft However, in claim 2, in the method of manufacturing a chair, the slide shaft and the back frame are connected by an interlocking metal member disposed inside the seat base in a plan view. By using a jig provided with a hooking picker, a fixed part hooked on the seat base, and a rotating lever for moving the picker backward, the interlocking bracket is moved backward by rotating the lever, whereby the slide shaft Is retracted against the locking spring, and the bush is fitted into the elongated hole of the seat receiving base in this state.

  The slide shaft originally slides in conjunction with the tilting of the back frame. Focusing on this point, in the invention of claim 3, the slide frame is tilted backward by connecting the back frame to the seat support base in advance before fitting the bush into the elongated hole of the seat support base. A method is adopted in which the shaft is retracted and the bush is fitted into the elongated hole of the seat base in that state.

  In the present invention, in a state where the bush is not fitted in the elongated hole of the seat receiving base, the slide shaft can be inserted into the elongated hole of the seat receiving base with the locking spring having a free length. Then, with the slide shaft retracted against the elastic force of the locking spring, the bush is fitted into the elongated hole of the seat base, and then the load on the slide shaft is released. The locking spring is compressed (preliminarily compressed) in advance.

  As described above, according to the present invention, since it is not necessary to rotate the knob of the spring holder at the time of assembling the spring, the locking spring can be incorporated very easily into the pre-compressed state from the beginning. The efficiency of assembling the chair can be improved. It can also be applied to a chair that does not have an adjustable spring receiver.

  Further, the bush is generally provided to allow smooth sliding of the slide shaft, and therefore, the bush can be applied to a wide range of chairs and is excellent in versatility. In addition, the slide shaft can be retracted in a stable state, and the slide shaft fits into the elongated hole of the seat receiving base and does not jump, so that the slide shaft can be securely resisted against the elastic force of the locking spring. Therefore, the locking spring is not scattered by some kind of spring during the operation, and the safety is excellent.

  If the method of Claim 2 is employ | adopted, there exists an advantage which can respond easily, even when there is no hook allowance of a jig | tool on a slide shaft. Further, since the interlocking metal fittings are disposed inside the seat receiving base, the interlocking metal fittings do not get in the way when the bush is fitted into the elongated hole of the seat receiving base. This is also the advantage of claim 2.

  If the method of Claim 3 is employ | adopted, since a special jig is not required, there exists an advantage which can suppress cost. When removing the rocking spring, slide shaft, etc. for repairing or disposing of the chair, the bushing of the seat base is placed with the back frame (or backrest) tilted backward in the reverse procedure of claim 3. Remove it from the slot.

  Next, an embodiment of the present invention will be described with reference to the drawings. The present embodiment is applied to a rotary chair for office use or the like. First, the configuration of the chair manufactured by the method of the present invention will be described, and then the manufacturing method which is an embodiment of the present invention will be described. The structure of the chair manufactured by 1st Embodiment is displayed in FIGS.

(1). Outline of chair First, the outline of the chair will be described with reference to FIGS. 1 is an overall perspective view of the chair, FIG. 2A is a front view of the chair, FIG. 1B is a side view of the chair, FIG. 3 is a rear view of the chair, and FIG. FIG. 5 is a schematic diagram showing the movement, partly broken and separated.

  The chair includes a leg 1, a seat 2, and a backrest 3. The leg 1 includes a group of branch legs 4 extending horizontally and a leg column (gas cylinder) 5, and a metal base 6 opened upward is attached to the upper end of the leg column 5. As shown in FIG. 4, the seat 2 includes a resin seat inner shell (seat plate) 2 a having a cushion 2 b on the upper surface and a seat outer shell 2 c disposed below the main member. The seat inner shell 2a is fixed to the seat outer shell 2c.

  A pair of left and right back frames 7 extending rearwardly from the seat support base 6 are connected to the rear end portion of the seat support base 6 so as to be able to tilt rearwardly. A substantially rectangular back frame 8 is fixed, and the upper part of the backrest 3 is fixed to the upper part of the back frame 8. Needless to say, the back frame 8 may be formed integrally with the back frame 7, or the left and right back frames 7 may be integrated. The back frame 8 can be rephrased as a back column.

  A front portion of the seat 2 (seat outer shell 2c) and a portion near the front end of the seat receiving base 6 are connected to each other by a pair of left and right front support links 9 so as to be relatively rotatable. On the other hand, it is fixed to the left and right back frames 7 and a box-shaped receiving member 10 (see, for example, FIG. 2A) disposed between them, and the rear portion of the seat 2 and the receiving member 10 support the left and right rear supports. The link 11 is connected so as to be relatively rotatable. Each support link 9 and 11 is in a non-sitting state and slightly tilted backward in a side view with respect to the vertical line.For this reason, when a person is seated, the front and rear support links 9 and 11 tilt backward. The seat 2 tilts backward while retracting (the retracted dimension of the seat 2 can be about 50 mm, for example).

  On the other hand, the backrest 3 is made of a material having flexibility such as an elastomer, and a plurality of vertically long ribs are integrally formed on the front surface and the back surface (a structure in which a cushion is stretched on a resin inner shell) Can be adopted.) In addition, a lumbar support portion 3a that is convex in a side view and that can support a lumbar portion (pelvis or lumbar vertebra) of a seated person is formed at a lower portion of the backrest 3.

  When the seat 2 is lowered while being seated by a person, the lumbar support portion 3a of the backrest 3 moves forward greatly. For this reason, a lumbar support function is exhibited even if a person does not sit down deeply. A mechanism for advancing the lumbar support portion 3a is schematically shown in FIG.

  That is, the drive shaft 12 is fixed to the lower end of the rear support link 11, and when the rear support link 11 is seated and tilted backward, the drive shaft 12 rotates along with this → the first interlock fixed to the drive shaft 12. The link 13 tilts backward → the second interlocking link 14 pushed by the first interlocking link 13 tilts backward around the rear end thereof → the third interlocking link pressed by the spring 15 provided in the second interlocking link 14 When the third interlocking link 16 tilts forward, the lumbar support part 3a moves forward by the fourth interlocking link 17 and the fifth interlocking link 18.

  The second interlocking link 14 and the third interlocking link 16 are connected to the receiving member 10 by a common shaft 19. A forward portion 16 a is formed at the lower end of the third interlocking link 16, and the forward portion 16 a is pushed by the spring 15. Further, the fourth interlocking link 17 is disposed at the left and right intermediate portion, and is connected to the backrest 3 and the third interlocking link 16 so as to be relatively rotatable. Further, the fifth interlocking link 18 has an arcuate shape in plan view, the left and right intermediate portions are connected to the third interlocking link 16 so as to be relatively rotatable, and the left and right end portions are connected to the lumbar support portion 3a so as to be relatively rotatable. .

  In FIG. 2, a fourth interlocking link 17 and a fifth interlocking link 18 appear, and in FIG. 3, third to fifth interlocking links 16, 17, 18 appear. Needless to say, the interlocking means for advancing the lumbar support portion 3a by the lowering of the seat 2 is not limited to the above-described structure, and a structure that does not use the support links 9, 11 and the interlocking links 13. Is possible. In the case of the embodiment, the receiving member 10 can be integrated with the back frame 7 (for example, the whole is a die-cast product).

  In addition, at the rear part of the seat 2, a locking lever 20 for stopping locking or switching the tilting angle, and a lumbar support part 3a of the backrest 3 for switching between a state where it can be advanced by sitting and a state where it does not advance. The lumbar lever 21 is arranged in a state separated from the left and right. Moreover, the code | symbol 22 shown to FIG. 2 (B) is the lever for raising / lowering operation which cancels | releases the lock | rock of the leg support | pillar 5. As shown in FIG.

(2). Seat Support Mechanism / Locking Mechanism Next, the support mechanism for the seat 2 and the locking mechanism for the backrest 3 will be described with reference to FIGS. 6 is a separated plan view taken along line VI-VI in FIG. 4, FIG. 7A is a partial perspective view of the base, FIG. 6B is a separated perspective view of members constituting the support link mechanism, and FIG. 4 is a cross-sectional view taken along the line VIIC-VIIC in FIG. 4, FIG. 8 is a perspective view of the interlocking metal fitting, and FIG. 9 is a longitudinal side view of a portion of the seating base with some members omitted.

  As clearly shown in FIG. 7C, the front portion of the seat 2 is connected to the seat receiving base 6 via the left and right front links 7 and the left and right laterally long first support shafts 25. In the present embodiment, the first support shaft 25 corresponds to the slide shaft recited in the claims. A pair of left and right front bearing portions 26 sandwiching the front support link 9 from both the left and right sides are integrally formed at the front portion of the seat outer shell 2c, and the front bearing portion 26 and the front support link 9 are relative to each other by a front pin 27. It is connected so that it can rotate.

  A pair of left and right rear bearing portions 28 for connecting the rear support link 11 are integrally formed at the rear portion of the seat 2, and the rear bearing portion 28 and the rear support link 11 are connected by a left and right longitudinal rear pin 29. Has been. The back frame 7 is connected to the rear portion of the seat receiving base 6 by a left and right longitudinal second support shaft 30 so as to tilt about the front end portion thereof.

  The seat base 6 has a generally horizontal posture at the bottom of the rear part, and the part other than the rear part has a shape that is slanted and rearwardly inclined in a side view so that the height increases toward the front. Yes. In addition, a reinforcing bracket 31 made of sheet metal is fixed to the rear portion of the seat receiving base 6 with a space between the seat receiving base 6 and the bottom surface of the seat receiving base 6. As shown in FIG. 4 and FIG. 9, the front end of the reinforcing bracket 31 is a front wall 31a in a posture slightly tilted rearward with respect to the vertical in a side view, and most of the portion excluding the front portion is substantially horizontal. It has become.

  A tapered receiving tube 32 passes through the bottom plate at the rear portion of the seat receiving base 6 and the horizontal portion of the reinforcing bracket 31 from above and below, and the receiving tube 32 is fixed by welding. Then, the upper end of the leg support 5 is fitted to the receiving tube 32. Further, a bank portion 31b that protrudes upward from the horizontal portion in a state of being continuous with the front wall 31a is formed at the front portion of the reinforcing bracket 31 so as to extend left and right. The back surface of the bank portion 31b has a substantially vertical posture.

  In the front part of the left and right side plates of the seat receiving base 6, there is an elongated hole 33 having a rectangular shape in side view in which the first support shaft 25 is slidably fitted in the front-rear direction. The elongated hole 33 is in a backward inclined posture parallel to the inclined posture of the seat receiving base 6, and a resin-made fixed bush 34 that covers the front end of the inner periphery is mounted in the elongated hole 33. .

  A slide bush 35 is slidably fitted to the fixed bush 34 so as not to rotate from the outside. In the chair of this embodiment, the slide bush 35 corresponds to the bush described in the claims. Further, the first support shaft 25 passes through the left and right slide bushes 35, and the slide bush 25 is fixed to the slide bush 35 with screws 36. The slide bush 35 may be made of resin or resin.

  Inside the seat receiving base 6, two right and left rocking springs (compression coil springs) 37 are arranged in a posture extending in the front-rear direction. The locking spring 37 is supported by a front spring receiver 38 and an adjustable rear spring receiver 39. The front spring receiver 38 is formed in a substantially U-shaped rearward opening in a side view, and is fitted to the first support shaft 25 from the rear.

  On the other hand, the rear spring receiver 39 is composed of a first member 40 that overlaps the front wall 31a of the reinforcing bracket 31 and a second member 41 that is U-shaped when viewed from the side, and is fitted to the first member 40 from the front (for details). As will be described later, when the horizontally long operating rod 42 is rotated, the second member 41 moves back and forth, and as a result, the initial elastic force of the locking spring 37 is adjusted. Both spring receivers 38 and 39 are provided with a convex portion that holds the locking spring 37 in a non-displaceable manner (it can also be a concave groove).

  The first support shaft 25 and the back frame 7 are connected so as to be relatively movable by an interlocking metal fitting 43, which is shown in its entirety in FIG. That is, the interlocking metal fitting 43 includes a pair of left and right main rods 44 disposed on the left and right outer sides of the rocking spring 37 in plan view, a plate-shaped material reinforcing stay 45 fixed to a portion near the front end of the left and right main rods 44, The left and right main rods 44 are fitted on the first support shaft 25 via resin bushes 47, while the rear tube 46 has a first cylinder 46 fixed to the rear end portion of the main rod 44. The three support shafts 48 penetrate therethrough, and the third shaft 48 is fitted into a bearing portion 7 a formed integrally with the back frame 7.

  Accordingly, the tilting of the back frame 7 and the front / rear slide of the first support shaft 25 are accurately synchronized (even if the interlocking metal fitting 43 is not present, the seat 2 and the interlocking support link 9 can be moved when the back frame 7 is tilted backward. , 11, the first support shaft 25 slides back and forth, and the interlocking metal fitting 43 is not essential for synchronizing the backrest 3 and the seat 2). The rear cylinder 46 (or the rear shaft) is fitted to the bearing portion 7a of the back frame 7 (in this case, the third support shaft 48 is not required), or the interlocking metal fitting 43 is faced down from the front with a single metal plate. It can also be formed in an open U shape.

  The interlocking metal fitting 43 also functions as a lock member for the backrest 3. In other words, the horizontal portion of the reinforcing bracket 31 has, for example, a lock for switching the backrest 3 to three modes: a state in which the backrest 3 is tilted at a full stroke, a state in which the backrest 3 is not tilted backward at all, and a state in which the backrest 3 is tilted in a range of about half the full stroke The lock device includes a step-type lock body 49 that can be moved back and forth as simply indicated by a one-dot chain line in FIG. 9. As a result, the tilting of the backrest 3 is controlled by controlling the downward movement of the 43 rear cylinders 46.

(3) Front support link mounting structure and spring support Next, with reference to FIGS. 10 to 12 in addition to FIG. 7, the detailed configuration and mounting structure of the front support link 9 and the details of the rear spring receiver 39 are described. Will be explained. 10 (A) is a partially broken plan view with the slide bush 35 separated from the seat base 6, and FIG. 10 (B) is a cross-sectional plan view with the slide bush 35 attached to the seat base 6. C) is a perspective view of the slide bush 35, FIG. 11 is a plan sectional view of the rear spring receiver 39, and FIG. 12 is a sectional view taken along line XII-XII in FIG.

  As shown in FIG. 7, the front support link 9 includes a horizontal cylindrical portion 9 a, while the slide bush 35 includes a rectangular portion 35 a that is non-rotatable and slidably fitted to the fixed bush 34, and the front support. A small-diameter cylindrical portion 35b that enters the cylindrical portion 9a of the link 9 so as to be rotatable from the inside is provided. In addition, a pair of stopper portions 35c extending outward in a state of being spaced apart from the small diameter cylindrical portion 35b are formed at the base portion of the small diameter cylindrical portion 35b.

  The pair of stopper portions 35c are disposed on both sides of the shaft center, and the stopper portion 35c is rotated by a certain angle (for example, about 50 to 55 degrees) with respect to the cylindrical portion 9a of the front support link 9. An arcuate groove 51 (see FIG. 7C) is formed. A return spring 52 is fitted into the small diameter cylindrical portion 35 b of the slide bush 35.

  The return spring 52 is a torsion spring in which a load is applied in the winding direction of the wire, and one end portion 52a bent so as to extend in the radial direction abuts against one stopper portion 35c and is bent so as to extend in the axial direction. The other end 52b is fitted in a stopper hole 53 formed in the cylindrical portion 9a of the front support link 9. The stopper hole 53 is non-annular so that the other end 52b of the return spring 52 does not move in the circumferential direction.

  When a person is seated, the front support link 7 tilts backward against the elastic force of the return spring 52, and when the person descends from the chair, the front support link 9 returns to its original posture by the elastic force of the return spring 52. (Return and rotate). As a result, the seat 2 returns to its original height when the user leaves the seat, and the lumbar support portion 3a that has advanced moves backward to its original position.

  When the return spring 52 is built in the front support link 7 as in the present embodiment, there are advantages in that it is compact and easy to assemble. Of course, the location and type of the spring means for returning the front support link 7 and the seat 2 to the neutral state can be arbitrarily selected as required. For example, a compression coil spring can be disposed between the lower surface of the seat 2 and the seat receiving base 6. 7C and FIG. 10 are slightly different in the form of the fixed bush 34, but FIG. 7C is a simplified display.

  Each of the fixed bush 34 and the slide bush 35 has a flange. As clearly shown in FIG. 10B, the rear-facing flange 35d of the slide bush 35 is positioned in the front, and the hole of the fixed bush 34 It is formed in a form that extends long so as to completely close the cover. Therefore, the problem that dust enters the hole of the fixed bush 34 can be solved. Further, the portion of the slide bush 35 that enters the fixed bush 34 has a dimension T of the front and rear portions larger than the thickness of the upper and lower portions.

  As described above, the rear spring receiver 39 includes the first member 40 and the second member 41, and the first member 40 and the second member 41 overlap each other in the front-rear direction as shown in FIG. The surface is an inclined surface (or cam surface) 54 that is inclined at a certain angle with respect to the horizontal crossing line in plan view. In the present embodiment, the inclined surface 54 is inclined so as to come to the front as it goes from left to right (right to left when the seated person is used as a reference) in the front view of the chair. But you can.

  The second member 41 of the rear spring receiver 39 has a right and left length capable of supporting the left and right rocking springs 37 as a matter of course, but the left and right length of the first member 40 is the left and right length of the second member 41. It is about half the length. Accordingly, the first member 40 can move left and right while being supported by the receiving wall 31a. In FIG. 11, the left-right movement stroke of the first member 40 is indicated by L1, and the front-back movement stroke of the second member 41 is indicated by L2.

  The operating rod 42 described above passes through the first member 40 of the rear spring receiver 39. The operation rod 42 protrudes greatly to the left as viewed from the front of the chair, and is provided with a knob 42a at the left end. The right end is held on the side plate 6a of the seat receiving base 6 by a snap ring 55 or the like so that it cannot be removed. On the other hand, a nut 56 is fitted in the first member 40 so as not to rotate, and the male thread portion of the operating rod 42 is screwed into the nut 56.

  On the other hand, the second member 41 is supported from the left side by a pocket-shaped side frame 57 disposed on the left side of the seat receiving base 6. Therefore, when the operating rod 42 is rotated, the first member 40 moves left and right, and then the second member 41 moves back and forth by the guide action of the inclined surface 54. Since the inclined surface 54 is inclined so as to come to the front as it goes from the left to the right, the second member 41 always moves to the left, and therefore, the first member 40 moves in the moving direction. Regardless, the second member 41 only moves back and forth without moving left and right.

  A bearing 58 is fitted in the space between the pocket-shaped side frame 57 and the left side plate 6 a of the seat receiving base 6, and the operation rod 42 is inserted through the bearing 48. For this reason, the operating rod 42 can be smoothly rotated.

  FIG. 11 shows a state in which the first member 40 of the rear spring receiver 39 is fully advanced, and the second member 41 is in contact with the front wall 31 a of the reinforcing bracket 31 in this state. That is, the second member 41 is fully retracted. Then, as shown in FIG. 10A, when the second member 41 is fully retracted and the locking spring 37 is in a free length state, a slight dimension E is provided between the first support shaft 25 and the front inner surface of the fixed bracket. Although the gap is set to be open, the dimension E of the gap is set to be considerably smaller than the thickness T of the front portion of the slide bush 35 (E may be larger than 0).

  Accordingly, the slide bush 35 cannot be fitted into the first support shaft 25 unless the locking spring 37 is slightly compressed, and when the slide bush 35 is fitted into the fixed bush 34, The rocking spring 37 is slightly compressed while the two members 41 are fully retracted. Then, the slide bush 35 is fitted into the fixed bush 34 by the method described below as the first embodiment.

(4). First Embodiment The fitting of the slide bush 35 to the fixed bush 34 is performed by compressing the locking spring 37 and retracting the first support shaft 25, which is the main point of the present invention. And the method of this embodiment is performed using the jig | tool 60 shown in FIGS. FIG. 13 is a longitudinal side view, and in FIG. 14, (A) is a plan view of the jig 60, (B) is a cross-sectional view taken along line BB of (A), and (C) is a cross-sectional view taken along line CC of (A). FIG.

  The jig 60 according to the present embodiment retreats the interlocking metal fitting 43 using the reinforcing bracket 31 in the seat receiving base 6 and includes a first fixing portion 61 that covers the bank portion 31b of the reinforcing bracket 31 from above. ing. The first fixing portion 61 has a flat plate shape, and a downward-facing lock piece 61a that overlaps the back surface of the bank portion 31b is integrally formed at the rear end thereof. A stopper claw 63 that fits into an engagement hole 62 formed in the rearward opening formed in the bank portion 31b is formed on the lock piece 61a by cutting and raising or the like (the stopper claw 63 can be replaced by a screw, for example). .)

  The first fixing part 61 has left and right side plates 61b and is formed in an upward U-shape when viewed from the front. The second fixing parts 64 extending to the upper surface of the front spring receiver 38 are welded to the inner surfaces of the left and right side plates 61b, respectively. The front end of the second fixing portion 64 is integrally connected by an auxiliary stay 65. The left and right second fixing portions 64 and the auxiliary stay 65, or the first and second fixing portions 61 and 64 and the auxiliary stay 65 are integrated with a single metal plate. It is also possible to do.

  A U-shaped bearing bracket 66 having a left and right side plate 66a facing upward is fixed to the left and right intermediate portions of the upper surface of the first fixing portion 61 by welding or the like. The rear part is fitted. The picker 67 includes a rod 69 having a screw shaft 68 projecting forward, left and right foot plates 70 fixed to the rod 69, and a horizontally long locking bar 72 fixed to the screw shaft 68 with a nut 71 so that the front and rear positions can be adjusted. I have.

  The left and right foot plates 70 are connected to the side plate 66 a of the bearing bracket 66 and the link 73 by a slide pin 74, while the locking bar 72 is L-shaped in a side view so as to overlap the reinforcing stay 43 a of the interlocking metal fitting 43. A plurality of locking claws 75 that are formed and hooked on the reinforcing stay 43a from below are cut and raised. There are two links 73 on the left and right, and each link 73 is disposed between the left and right foot plates 70. The slide pin 74 is fitted in a long hole 66b (see FIG. 14A) formed in the bearing bracket 66 so as to be slidable back and forth. Therefore, the picker 67 moves back and forth by the back and forth movement of the slide pin 74.

  Furthermore, the jig 60 further includes a lever (handle) 76. The lower portion of the lever 76 is made of a metal plate (or square member), and the lower end portion is connected to the rear portion of the bearing bracket 66 by a left and right longitudinal pivot pin 77. A portion of the lever 76 that is slightly above the pivot pin 77 is connected to the link 73 by a connecting pin 78. Therefore, when the lever 76 is tilted backward from a substantially upward posture and turned, the connecting pin 78 moves backward, so that the link 73 and the picker 67 move backward.

  In this case, the pivot pin 77 and the slide pin 74 are set to substantially the same height, and the link is formed in an arc shape opened downward. For this reason, when the lever 76 is greatly tilted rearward and rotated, the axis of the connecting pin 78 moves below the line connecting the axis of the slide pin 74 and the axis of the pivot pin 77 (ie, exceeds the fulcrum). Thus, the picker 67 is held in the retracted state.

(5). Specific Work Procedure of First Embodiment As can be understood from the above description, the step of attaching the locking spring 37 and the first support shaft 25 is performed according to the following procedure.

  That is, first, the fixed bush 34 is mounted in the elongated hole 33 of the seat receiving base 6 in advance, and then the locking spring 37 and the front and rear spring receivers 38 and 39 are disposed inside the seat receiving base 6 and interlocked. The metal fitting 43 is arranged so that the front end thereof is inside the seat receiving base 6, and then the first support shaft 25 is inserted into the seat receiving base 6, the interlocking metal fitting 43 and the front spring receiver 38, and then the jig is fixed. The procedure of using the tool 60 to retract the interlocking metal fitting 43 and the first support shaft 25, then fitting the slide bush 35 into the fixed bushing 34, and then retracting the interlocking metal fitting 43 and the first support shaft 25. Done in The assembly of the front support link 9 is preferably performed with the first support shaft 25 being advanced.

  The retraction operation of the interlocking metal fitting 43 by the jig 60 is performed by first setting the first fixing portion 61 of the jig 60 on the bank portion 31b of the reinforcing bracket 31 and fitting the stopper claw 63 into the engagement hole 62. In a state where the picker 67 is moved forward, the engaging claw 75 is fitted below the reinforcing stay 43a of the interlocking metal fitting 43, and then the lever 76 is largely tilted backward and rotated. Then, as described above, when the lever 76 is fully tilted and rotated, the picker 67 is held in the retracted state, so that one operator can perform the retracting operation of the interlocking metal fitting 43 and the fitting of the slide bush 35.

  The slide bush 35 may be fitted in the end of the first support shaft 25 in advance before the interlocking metal fitting 43 is retracted, or after the interlocking metal fitting 43 is retracted, the slide bush 35 is attached to the first support shaft 25. It is also possible to fit in the shaft 25 and the fixed bush 34.

  As a general order of assembly (manufacture) of the chair, roughly speaking, mounting of the seat base 6 to the leg support 5, mounting of the b locking spring 37 and the first support shaft 25, c slide bush 35 and front The attachment of the support link, the attachment of the d-back frame, the assembly of the interlocking device for advancing the e-lumbar support portion 3a, and the attachment of the f seat 2 and the backrest 3 are performed. The locking device for locking described above is attached after the locking spring 37 and the first support shaft 25 are assembled.

  When the jig 60 having the lever of the lever as in the present embodiment is used, the locking spring 37 can be compressed in one touch, and thus there is an advantage that high work efficiency can be secured. Further, it can be said that the jig is hooked on the rear end of the seat receiving base 6, for example, but if the bank portion 31b of the reinforcing bracket 31 is used as in this embodiment, the jig 60 can be made compact. There is.

  Further, the first support shaft 25 can be pulled directly or the front spring receiver 38 can be pushed rearward. However, when the structure in which the interlocking metal fitting 43 is pulled as in this embodiment is employed, the interlocking metal fitting 43 Since the distance between the left and right main shafts 44 is large, there is an advantage that the first support shaft 25 can be moved backward in a stable state. It is also possible to compress the locking spring 37 by assembling the back frame 7 and the interlocking metal fitting 43 without using the jig 60 and then tilting the back frame 7 backward to retract the interlocking metal fitting 43. (In this case, the receiving member 10 is preferably fixed to the back frame 7 in advance).

  By the way, if the configuration is such that the locking spring 37 is set in the natural length state with the second member 41 of the rear spring receiver 39 fully retracted, the left and right stroke L1 of the first member 40 of the rear spring receiver 39 is increased. If it is necessary (a stroke larger than that required for using the chair is required), the lateral width dimension of the seat base 6 must be increased.

  On the other hand, in this embodiment, since the slide bush 35 can be assembled in a state in which the locking spring 37 is compressed, the left and right movement stroke L1 of the first member 40 is sufficient for the use of the chair. For this reason, there is an advantage that the seat receiving base 6 can be prevented from becoming larger than necessary. Further, when the front and rear portions of the slide bush 35 are made thicker than the upper and lower portions, there is an advantage that the locking spring 37 can be largely pre-compressed without excessively increasing the elongated hole 33 of the seat receiving base 6. is there.

(6). Second Embodiment FIG. 15 shows a second embodiment. (A) is a schematic side view of a chair, (B) is a BB cross-sectional view of (A) in the middle of the process, and (C) is a side cross-sectional view of a fixed bush. In this embodiment, a slide bush is not provided.

  In this embodiment, an intermediate fitting 80 having a downward opening is fixed to the lower surface of the seat 2, and front and rear bearing portions 81, 82 are formed on the left and right side plates of the intermediate fitting 80, and the front bearing FIG. The rear bearing portion 82 is connected to the back frame 7 by a fourth support shaft 83. Although not shown in the drawing, the first support shaft 25 is prevented from being detached by a retaining means such as a snap ring.

  As shown in (C), the thickness of the front part of the fixed bush 34 is set to a dimension larger than the thickness dimension of other parts (or at least the thickness dimension of the upper part and the lower part). For this reason, in order to fit the fixed bush 34 into the elongated hole 33, the locking spring must be compressed by a certain size. For this reason, the reference elastic force of the locking spring (the longitudinally movable member of the adjustable spring receiver is The spring force in the most retracted state) can be set to a certain level of strength.

  In this embodiment, the front bearing portion 81 of the intermediate metal fitting 80 is disposed inside the seat receiving base 6. When assembling the first support shaft 25 and the locking spring (not shown), the fixed bush 34 may be assembled into the elongated hole 33 after the first support shaft 25 is retracted.

  There are roughly three methods for retracting the first support shaft 25. In the first method, the seat 2 and the back frame 7 are assembled with only the fixed bush 34 left, and then the back frame 7 is tilted backward. In the second method, by inserting only the first support shaft 25 through the intermediate metal fitting 80, the seat 2 is flipped forward and rotated as shown by the dotted arrow in FIG. A spring is disposed, and then the first support shaft 25 is retracted by using some jig. As the jig, for example, a type that has a lever as in the first embodiment and hooks the rear end of the fixed portion on the rear end edge of the seat receiving base 6 can be used.

  Further, in the third method, the back frame 7 is connected only to the seat base 6 and not to the intermediate fitting 80, and a jig is hooked between the back frame 7 and the first support shaft 25, and the back frame 7 is attached. In this case, the back frame functions as a lever. More specifically, for example, the fourth support shaft 83 or a rod equivalent thereto is inserted into the back frame 7, and the front portion of the jig is inserted into the fourth support shaft 83 (or rod) and the first support shaft 25. And the rear part can be fitted, and the back frame 7 can be tilted backward in that state.

  When the bearing portions 81 and 82 of the intermediate metal fitting 80 are disposed outside the seat receiving base 6, the fixed bush 34 is fitted into the elongated hole 33 from the inside of the seat receiving base 6. Note that the fixed bush 34 does not have to be a single structure, and a structure including a plurality of parts separated in the left and right or up and down directions can also be used. It is also possible to provide a slide bush in this type of embodiment.

(7). Others The present invention can be embodied in various ways other than the above embodiment. For example, a jig having a single structure such as a bar shape can be used. Needless to say, there may be only one locking spring. The present invention can also be applied to a method for manufacturing a chair of a type in which only the backrest tilts backward. Further, when applied to a chair having an adjustable spring receiver, the adjusting knob may be disposed, for example, on the lower surface portion of the seat receiving base. When a lever-type jig is used, it is also possible to adopt a composite link method so that the pin exceeds the fulcrum with a small tilt angle of the lever.

  In addition, the “bush” described in the claims refers to the one that holds the return position of the slide shaft by sliding the slide shaft against the locking spring and then inserting it into the elongated hole. It is not always necessary to have an annular shape that extends along the long hole, but a member that is located only on the front side of the slide shaft in the long hole (part of the annular bush or added to the annular bush) A member that functions as a stopper is also included.

It is a general perspective view of the chair manufactured by this invention. It is the front view and side view of a chair. It is a rear view of a chair. It is a partially broken isolation | separation side view which shows the support means of a seat. It is a figure which shows a motion of a chair. FIG. 6 is a plan view taken along the line VI-VI in FIG. 5. (A) is a partial perspective view of the base, (B) is an exploded perspective view of members constituting the support link mechanism, and (C) is a sectional view taken along the line VIIC-VIIC in FIG. 4 with a seat attached. It is a perspective view of the interlocking metal fitting. It is the vertical side surface of the part of the seating base in the state which abbreviate | omitted some members. (A) is a partially broken plan view with the slide bush separated from the seat base, (B) is a cross-sectional plan view with the slide bush attached to the seat base, and (C) is a perspective view of the slide bush. It is. It is a plane sectional view of a rear spring receiver. FIG. 12 is a sectional view taken along line XII-XII in FIG. 11. It is a vertical side view which shows the method of 1st Embodiment. (A) is a top view of a jig | tool, (B) is BB sectional drawing of (A), (C) is CC sectional drawing of (A). It is a figure which shows 2nd Embodiment.

Explanation of symbols

1 leg 2 seat 3 backrest 5 leg support 6 seat base 7 back frame 8 back frame 9 front support link 25 first support shaft which is an example of slide shaft 34 fixed bush 35 slide bush 37 locking spring 38 front spring receiver 39 rear Spring support 60 Jig 61 First fixing part 67 Picker 73 Link 76 Lever

Claims (3)

A seat base fixed to the upper end of the leg support; a seat disposed above the seat base; a back frame connected to the seat base so as to be tilted backward; a backrest attached to the back frame; And a slide shaft that reciprocates substantially in the front-rear direction in conjunction with the tilting of the back frame.The seat support base has left and right side plates and is open upward. In addition, an elongated hole into which the slide shaft is slidably fitted is formed, the slide shaft is fitted into the elongated hole via a bush, and further, the back frame of the back frame is provided inside the seat receiving base. A compression-type rocking spring that provides resistance to the slide of the slide shaft that slides in conjunction with rearward tilting is disposed.
A chair manufacturing method,
Assembling the slide shaft and bush
The locking spring is set inside the seat receiving base, and the slide shaft is fitted into the elongated hole without the bush being fitted into the elongated hole of the seat receiving base, and then the bush can be inserted into the elongated hole. The slide shaft is retracted until the lock spring is compressed until the lock spring is compressed, and then the bush is fitted into the elongated hole of the seat base with the lock spring compressed, and then the load of the lock spring on the slide shaft is released.
The chair manufacturing method characterized by performing in the procedure called. The slide shaft and the back frame are connected by an interlocking fitting disposed inside the seat base in a plan view, and the manufacturing method of the chair,
By using a jig equipped with a picker that is hooked to the interlocking bracket, a fixed part that is hooked to the seat base, and a pivoting lever that retracts the picker, the lever is pivoted to retract the interlocking bracket. , Retreating the slide shaft against a locking spring, and fitting the bush into the elongated hole of the seat receiving base in that state;
The method of manufacturing a chair according to claim 1. Before fitting the bush into the elongated hole of the seat receiving base, the back frame is connected to the seat receiving base in advance, and the slide shaft is retracted by tilting the back frame backward. Fitting the bush into the hole;
The method of manufacturing a chair according to claim 1.

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