JP5953709B2 - Chair operating lever mounting device - Google Patents

Description

  The present invention relates to an operation lever mounting device for a chair, and more particularly to an operation lever mounting device for a chair capable of adjusting the height of a seat portion by operating a gas cylinder provided on a leg portion.

  Conventionally, a gas cylinder is provided in a pedestal standing upright on the leg portion so as to be rotatable and movable up and down, and a metal seat support that supports the seat portion is fixed to an upper end portion of the gas cylinder, A base portion of a backrest supporting the backrest portion is pivotally attached to the seat receiving body so as to be rockable by the rotation shaft, and the gas cylinder is operated by the operation lever provided on the seat portion to operate the seat. Various chairs with adjustable height are available.

  An operating pin for releasing the lock is provided at the upper end of the gas cylinder, and the operation lever provided on the side of the seat is tilted to adjust the height of the seat. Push the pin. Conventionally, the operation lever is generally attached to the seat receiver so that the shaft portion is rotatable. As the support structure of the shaft portion, the metal seat receiver was processed and a part was cut and raised to form a bearing portion, or another bearing portion was attached inside the seat receiver. . However, in this case, the number of processing steps for the seat receiving body is increased, and the number of parts is increased, resulting in high costs.

  Therefore, as described in Patent Document 1, in a structure in which a metal seat receiver is attached to the lower surface of a synthetic resin seat outer, a pivot that is fixed to the lower surface of the seat outer so as to cross the operation lever is accommodated. A holding groove is formed, and the seat receiver is attached in a state in which the pivot of the operation lever is accommodated in the holding groove, so that the holding groove is blocked by a part of the seat receiver, and the operation lever is attached to be tiltable. Structure is provided. However, the method described in Patent Document 1 requires a process of welding the pivot to the main body of the operation lever, and the operation lever easily drops until the seat receiver is attached to the lower surface of the seat outer. have.

JP 2008-099837 A

  Therefore, in view of the above-described situation, the present invention intends to solve the problem that the height of the seat portion is determined by operating the operation lever provided on the seat portion with the gas cylinder provided inside the pedestal standing on the leg portion. In a chair that can be adjusted, the operation lever is easy to install, the number of parts is small, no additional processing is required on the metal part, and the operation lever does not fall off during assembly, reducing costs. It is the point which provides the operating lever mounting apparatus of the chair which contributes.

In order to solve the above-mentioned problem, the present invention is a chair in which the height of the seat can be adjusted by operating an operation lever provided on the seat with a gas cylinder provided inside the pedestal standing upright on the leg. The operating lever is formed by bending a shaft portion rotatably supported from a single metal rod, a handle portion on the base side of the shaft portion and an action portion on the distal end side in a crank shape, A bearing portion that integrally fits and holds the shaft portion rotatably is formed on the inner side along the hanging wall formed on the back surface of the synthetic resin seat outer constituting the seat portion , and the bearing portion An opening that allows the vertical displacement of the handle portion of the operation lever without forming the suspension wall is formed in the drooping wall in the vicinity of the drooping wall, and the action portion and the shaft portion of the operation lever are formed in the opening. and characterized in that fitted pivotably shaft portion into the bearing portion is inserted from the outside That was constructed the chair of the operation lever mounting device (claim 1).

Further, the two bearing portions are formed to be coaxial along the inner side of the hanging wall of the outer seat, and the bearing portions protrude so as to face the inner ends of the pair of fitting pieces. It is more preferable that the shaft portion is fitted to the bearing portion in a retaining state (Claim 2 ).

And, by attaching a metal seat receiver for attaching to the upper end of the gas cylinder in the space between the two hanging walls projecting parallel to the back surface of the seat outer, the shaft portion of the operation lever is It is also preferable to conceal it (claim 3 ).

In the chair operating lever mounting device according to the first aspect of the present invention, the operating lever provided on the seat is operated by operating the operating lever provided on the seat with the gas cylinder provided inside the pedestal standing on the leg. In the chair whose height can be adjusted, the operation lever includes a shaft portion rotatably supported by a single metal rod, a handle portion on the base side of the shaft portion, and an action portion on the distal end side. A bearing portion that is formed by bending the shaft portion and is rotatably fitted inside and held along a hanging wall formed on the back surface of the synthetic resin seat outer that constitutes the seat portion. And forming an opening through which the vertical movement of the handle portion of the operation lever can be allowed without passing through the hanging wall in the vicinity of the bearing portion and without dividing the hanging wall. The action part and the shaft part are inserted from the outside and the shaft part is rotated around the bearing part. Since capable only fits, with the mounting of the operating lever is simple, fewer parts, it is not necessary to perform additional processing on the metal part, also possible without falling off the operating lever during the assembly, cost reduction It contributes to the conversion. In addition, the operation lever can be formed by bending a single metal rod into a crank shape, so the number of parts is small, there is no welding process, it is easy to manufacture, and it is attached through an opening provided in the hanging wall. The shaft portion and the bearing portion are not visible from the outside and are not only excellent in appearance, but also the tilt angle of the operation lever is regulated by the opening, so that reliability in operation is increased. Further, when the operation lever is operated, a vertical displacement of the handle portion can be allowed, and the opening does not divide the hanging wall, so that the bending strength can be maintained even if the opening is provided.

According to claim 2 , the two bearing portions are formed to be coaxial along the inner side of the hanging wall of the outer seat, and the bearing portions are opposed to the inner ends of the pair of fitting pieces. The projecting part is formed so that the shaft part is fitted to the bearing part in a retaining state. Therefore, after the operating lever is attached to the outer seat, the operating lever does not fall off and is assembled. Assembly efficiency is improved because there is no need to pay extra attention to the process.

According to claim 3 , the operation is performed by attaching a metal seat receiver for attachment to the upper end of the gas cylinder in a space between both hanging walls projecting in parallel to the back surface of the outer seat. Since the shaft portion of the lever is concealed, the shaft portion and the bearing portion of the operation lever are completely hidden by the seat receiver and the appearance is improved, and it is possible to prevent the dust and foreign matter from entering the mechanism portion from entering.

It is a front view of the chair concerning the present invention. It is the longitudinal side view of a chair similarly. It is an exploded perspective view of a chair similarly. It is the perspective view which looked at the state which attached the operation lever to the seat outer so that rocking was possible from the back side. It is a partial expansion perspective view of the state where the operation lever was similarly attached to the seat outer so that rocking was possible. It is a partial expanded vertical side view of the state which similarly attached the operation lever to the seat outer so that rocking was possible. The backrest heel of this embodiment is shown, (a) is a perspective view of a backrest heel, (b) is a side view of the front-end | tip part of a backrest heel, (c) is a perspective view of the front-end | tip part of a backrest heel. . It is a partial vertical front view which shows the pivot part which attached the backrest heel to the seat receiving body so that locking was possible. FIG. 6 is a partial cross-sectional view of the pivotally attached portion of the backrest. The pivot attachment part of a backrest is also shown, (a) is a partial side view, and (b) is a partial transverse plan view. It is a whole perspective view which shows the decorative cover of this embodiment. It is a partial vertical front view which shows the relationship between a seat outer, a backrest heel, and a makeup | decoration cover. The relationship between a seat part and a backrest part is shown, (a) is a partial side view in which the backrest part is in an unloaded state, and (b) is a partial side view in a locking state in which the backrest part is tilted backward. The relationship between a seat part and a backrest part is shown, (a) is a partial longitudinal side view of the backrest part in an unloaded state, and (b) is a partial longitudinal side view of a rocking state in which the backrest part is tilted backward.

  Next, the present invention will be described in more detail based on the embodiments shown in the accompanying drawings. 1 to 3 show a chair according to the present invention, in which 1 is a leg, 2 is a seat, 3 is a backrest, 4 is a backrest, 5 is a pivot, 6 is an operating lever, Reference numeral 7 denotes a decorative cover.

  The chair according to the present invention is provided with a gas cylinder 9 that is rotatable and can be moved up and down inside a pedestal 8 that is erected on the leg 1, and is made of metal that supports the seat 2 on the upper end of the gas cylinder 9. The base of the backrest 4 that supports the backrest 3 is fixed to the seat base 10 so that it can be locked by the rotating shaft 5. The gas cylinder 9 is operated by the provided operating lever 6 so that the height of the seat portion can be adjusted, and for the purpose of preventing finger jamming at the movable portion and improving the appearance when locking. The lower part of the backrest ridge 4 is covered with the decorative cover 7. In addition, in order to provide the resistance against the backward tilting of the backrest 3, an elastic capable of adjusting the resistance between the tilting plate 11 provided at the base of the backrest 4 and the seat support 10. Biasing means 12 is provided. It should be noted that structures not related to the present invention can be replaced with other known structures.

  The seat portion 2 has a structure in which the seat receiver 10 is attached to the lower surface of a synthetic resin outer seat 13, and a seat cushion 14 made of molded urethane is covered with a tension fabric 15 on the upper surface of the outer seat 13. It is. In order to attach the armrests 16 and 16 to both sides of the seat 2, the elbow reinforcement bracket 17 is attached to the upper surface of the seat outer 13, the fixing portion of the armrest 16 is positioned on the lower surface side of the seat outer 13, Screw on the elbow reinforcement 17.

  The backrest 3 is provided with a urethane back cushion 19 on the front side of the back inner 18 made of synthetic resin, the surface thereof is covered with a tension fabric 20, and the peripheral portion of the tension fabric 20 is covered with the back inner 18. And the upper edge of the backrest ridge 4 is attached to the center of the back inner side of the back inner 18 and a synthetic resin back outer 21 is attached from the back side. It is a structure in which the peripheral edge of the tension fabric 20 is pressed and held around the back outer 21 by fitting.

  Further details of each part will be described with reference to the accompanying drawings. First, as shown in FIG. 4, the seat outer 13 is an integrally molded product made of a synthetic resin in which a large number of ribs 22,... The hanging walls 23, 23 extending in a straight line are formed, and both the hanging walls 23, 23 are continuous with the connecting wall 24 on the front side. In particular, both the hanging walls 23, 23 protrude downward larger than any of the ribs 22,. And the attachment holes 25 and ... are penetrated and formed in the four corners of the space enclosed by both the said hanging walls 23 and 23 and the connection wall 24. As shown in FIG. On the other hand, as shown in FIGS. 1 to 3 and FIG. 6, the metal seat support 10 is press-molded into a cross-sectional hat shape, and a reinforcing plate 27 is formed outwardly at the upper end periphery of the box portion 26 opened upward. It is a thing. Further, a fixing portion 28 for fixing the upper end portion of the gas cylinder 9 is formed at the center of the bottom surface of the box portion 26 of the seat receiver 10, and the operating pin 29 of the gas cylinder 9 passes through the fixing portion 28 to It is exposed inside the box portion 26. Then, in a state where the reinforcing plate 27 of the seat receiver 10 is fitted in the space surrounded by the hanging walls 23, 23 and the connecting wall 24, the reinforcing plates 27, 27 on both sides and the mounting holes 25,. The fixing screw 30 penetrated from below and the claw nut 31 are tightened and attached.

  Next, based on FIGS. 4-6, the attachment structure of the said operation lever 6 for operating the action | operation pin 29 of the said gas cylinder 9 and adjusting the height of the seat part 2 is demonstrated. The operating lever 6 is formed by bending a shaft portion 32 rotatably supported from a single metal rod, a handle portion 33 on the base side of the shaft portion 32, and an action portion 34 on the distal end side in a crank shape. While being formed, a synthetic resin lever cap 35 is fixed to the handle portion 33.

Then, a bearing portion 36 for integrally fitting the shaft portion 32 of the operation lever 6 to be rotatable is integrally formed in a space surrounded by the hanging walls 23 and 23 and the connecting wall 24 on the back surface of the outer seat 13. doing. In the present embodiment, the two bearing portions 36 and 36 are formed so as to be coaxial with an interval. Here, the bearing portion 36 includes a pair of fitting pieces 36A and 36A protruding to the back surface side, and the shaft portion 32 is rotatably fitted between the fitting pieces 36A and 36A. This is a known structure in which the protrusions formed so as to face the inner ends of the combined pieces 36A and 36A are secured. The bearing portions 36 and 36 are formed along one of the hanging walls 23, and an opening 37 is formed in the hanging wall 2 in the vicinity of the bearing portion 36. The opening 37 is formed by removing the protrusion of the front mold when the seat outer 13 is molded.

In order to mount the operation lever 6 on the back side of the outer seat 13, the action part 34 is inserted into the opening 37 from the outside of the hanging wall 23, and the opening 37 is passed through the bent part to the shaft part 32. Then, the shaft portion 32 is rotatably fitted to the bearing portions 36 and 36. Thereafter, when the seat receiver 10 is attached to the seat outer 1 as described above and the upper end portion of the gas cylinder 9 is fixed to the fixing portion 28, the distal end portion of the action portion 34 of the operation lever 6 is moved to the gas cylinder 9. It comes to be located just above the actuating pin 29. Usually, since the weight of the handle portion 33 including the lever cap 35 of the operation lever 6 is heavier than the weight of the action portion 34, the handle portion 33 is lowered by its own weight, and the action portion 34 is in the raised position. Then, by lifting the lever cap 35, the action part 34 descends with the shaft part 32 as a fulcrum and pushes the operating pin 29 of the gas cylinder 9 to release the lock, thereby increasing the height of the seat part 2. You can adjust it. Here, since the shaft portion 32 of the operation lever 6 is fitted to the bearing portions 36, 36, the operation lever 6 does not flutter unnecessarily due to its sliding friction. The opening 37 provided in the depending wall 23 is vertically and has a long shape so as to be able to tolerate the vertical displacement of the handle portion 33 of the operating lever 6.

  Thus, since the operating lever 6 is simply fitted through the opening 37 to the bearing portions 36 and 36 formed on the back surface side of the seat outer 13, it is processed into a metal seat receiving body 10 as in the prior art. In addition, the number of manufacturing processes is reduced and the number of parts is reduced compared to other bearing parts, which contributes to cost reduction. Further, since the opening 37 does not divide the hanging wall 23, the bending strength can be maintained even if the opening 37 is provided.

  However, when the lever cap 35 of the operation lever 6 is lifted, a force is applied in a direction in which the shaft portion 32 is disengaged from the bearing portion 36. Therefore, when the lever portion 35 is lifted more strongly than necessary, the shaft portion 32 falls off the bearing portion 36. In order to prevent this, as shown in FIG. 5, a restriction plate 38 made of metal or synthetic resin is provided on the seat outer 13 below the shaft portion 32 located between the bearing portions 36, 36. It is also preferable to attach and restrict the downward displacement of the shaft portion 32. Specifically, one end of the restriction plate 38 is fitted and held in a fitting portion 39 integrally formed with the outer seat 13, and the other end of the restriction plate 38 is attached to the cylindrical shape of the outer seat 13 with a screw 40. Screw onto the base 41.

  Next, a connection structure between the backrest 4 and the backrest 3 will be described with reference to FIGS. In this embodiment, two substantially back-shaped backrest ridges 4, 4 having the same outer shape in side view are arranged in parallel, and the base 42 can be rotated up and down on the seat receiver 10 by the rotation shaft 5. The backrest 3 can be locked. The two backrest ridges 4, 4 are integrated by welding the tilting plate 11 at the substantially horizontal base portions 42, 42, and are welded by passing the belt-like mounting plate 44 at the rising portions 43, 43 at the front end portions. It is integrated. The backrest 4 is made of a metal round pipe, and a flat fixing plate 45 is integrally formed at a predetermined angle by pressing the tip of the rising portion 43.

  More specifically, as shown in FIG. 7, the backrest ridge 4 has a shape in which the upper end of the rising portion 43 intersects with the back surface of the fixed plate 45 while maintaining a round pipe shape. The front surface of 45 is a flat surface, and the rear surface is continuous up to the center with the metal round pipe of the rising portion 43 maintaining a circular cross section. In other words, the cut surface of the metal round pipe cut obliquely is joined from the center of the back surface of the plate-shaped fixing plate 45 to one end. As shown in FIG. 7B, the angle θ at which the rising portion 43 intersects with the fixed plate 45 can be set in the range of 15 to 50 degrees, and in this embodiment is about 23 degrees, An angle of 30 degrees is preferred. By forming the fixed plate 45 from a metal round pipe in such a form by pressing, the aforementioned angle θ can be set in a wide range. Since the metal plate is supported up to the center of the back surface of the fixed plate 45, the bending rigidity with respect to the fixed plate 45 is increased, and the durability can be improved. Of course, this shape can be realized by welding the solid plate 45 as a separate member to the obliquely cut end surface of the rising portion 43, but this embodiment is characterized by being integrally formed by pressing. is there.

  Mounting holes 46 are formed in the fixing plate 45 of the backrest 4, and mounting holes 48 are also formed in mounting pieces 47 that are bent at both ends of the mounting plate 44. As shown in FIG. 2, it is attached with screws 49,. These attachment structures are concealed by attaching the back outer 21 to the back side of the back inner 18. Here, the fixing plate 45 is flat and has a large contact area with the back surface of the back inner 18 so that the load can be distributed and supported with respect to the back inner 18, stress concentration and It is possible to suppress backlash and enhance durability. Further, since the fixing plate 45 of the backrest ridge 4 is flat, positioning when attaching to the back inner 18 is facilitated, and the thickness of the backrest portion 3 before and after can be suppressed. Here, the mounting pieces 47 may be slidably engaged with an engaging portion formed on the back surface of the back inner 18 instead of screwing.

  Next, based on FIGS. 1-3 and FIGS. 7-10, the structure which pivotally attaches the said backrest 4 to the said seat receptacle 10 with the rotating shaft 5 is demonstrated. In the state where the seat receiver 10 is attached to the space surrounded by the both hanging walls 23 and 23 of the outer seat 13 and the connecting wall 24, the box of the hanging wall 23 and the seat receiver 10 is shown in FIG. A space is formed between the side plates 50 of the portion 26, and the base portions 42 and 42 of the backrest ridges 4 and 4 are respectively positioned in the left and right spaces so as to penetrate the side plates 50 and 50 of the box portion 26. The pivot shaft 5 is supported so as to be pivotable. As shown in FIG. 7, a non-circular hole 51 is formed in the base portion 42 of one of the backrest ridges 4, and a circular hole 52 is formed in the base portion 42 of the other backrest ridge 4. The rotating shaft 5 has one end of a metal round bar as a non-cylindrical part 53 that fits into the non-circular hole 51 in a non-rotating manner. Specifically, the metal round bar is pressed to project both sides in the diameter direction. Portions 53A and 53A are formed. Here, the non-circular hole 51 has a shape in which concave portions 51A and 51A for receiving the convex portions 53A and 53A are formed in the diameter portion of the circular hole 52. The relationship between the non-circular hole 51 and the non-cylindrical portion 53 itself. Is a known structure.

  On both side plates 50, 50 of the box portion 26 of the seat receiver 10, through holes 54, 54 having a diameter sufficiently larger than the diameter of the rotating shaft 5 are formed by burring inward. Yes. That is, a cylindrical portion is provided around the through hole 54 inside the side plate 50. And the synthetic resin bush 55 which has the flange part 56 on the outer side is each fitted in the through-hole 54 of the said side plate 50. As shown in FIG. At the same time, the cylindrical portion of the pivot shaft 5 is inserted from the non-circular hole 51 of the backrest 4, passes through the two bushes 55, 55, and is inserted into the circular hole 52 of the other backrest 4. The base provided with the non-cylindrical portion 53 is fitted into the non-circular hole 51. The length of the rotating shaft 5 is shorter than the interval between the two hanging walls 23, 23, and both ends protrude from the backrests 4, 4 respectively. The seat receiver 10 is attached to the seat outer 13 in a state in which the base portions 42 and 42 of the backrest ridges 4 and 4 are rotatably connected to the box portion 26 of the seat receiver 10 by the rotation shaft 5. As a result, the rotating shaft 5 is positioned between the two hanging walls 23, 23, and both ends of the rotating shaft 5 are stopped, thereby preventing the E-ring or the like from being pulled out at the tip of the rotating shaft 5. Even if a member is not mounted, the retaining is made. However, normally, both ends of the rotating shaft 5 are set so as not to contact the both hanging walls 23, 23.

  Therefore, the number of assembly steps is reduced and the number of parts is reduced, which contributes to cost reduction. In addition, since the non-cylindrical portion 53 provided with the convex portions 53A and 53A is fitted in the non-circular hole 51, the rotation shaft 5 rotates with respect to the backrest 4 when locking. Therefore, the bushes 55 and 55 are rotated with respect to the box portion 26 of the seat receiver 10 as bearings, and the flange portion 56 of the bush 55 is connected to the backrest 4 and the side plate 57 of the box portion 26. Since it functions as a spacer in between, there is no noise between metals, wear is reduced, and the turning operation is smooth. In addition, since the through hole 54 is formed by burring, the inner cylindrical portion can disperse the load applied to the bush 55, and the durability of the bush 55 is enhanced. In addition, although the non-circular holes 51 and 51 of the same shape were formed in both the tube walls of one said backrest collar 4, this is because it was easy to process, and as shown in FIG.9 and FIG.10, as shown in FIG. Since the non-circular hole 51 formed in the tube wall does not fit the non-cylindrical portion 53 of the rotating shaft 5, the inner side may be a circular hole.

  As described above, the bases 42 and 42 of the backrests 4 and 4 that support the backrest 3 so as to be rockable are pivotally attached to the seat receiver 10 constituting the seat 2 by the rotation shaft 5. The elastic biasing means in a direction in which the distance between the tilting plate 11 and the bottom plate 57 of the box portion 26 of the seat receiver 10 approaches each other is fixed to the base portions 42 and 42 of the backrests 4 and 4. At 12, an elastic biasing force is applied to the back tilt of the backrest 3. The elastic biasing means 12 has a known structure, but as shown in FIG. 12, an adjustment screw shaft 58 is passed through openings formed in the tilting plate 11 and the bottom plate 57 so that the adjustment screw shaft 58 A compression coil spring 60 is interposed between the locking member 59 fixed to the upper end and the bottom plate 57, and a nut embedded in the adjustment handle 61 at the lower end of the adjustment screw 58 penetrating the tilting plate 11. The member 62 is screwed together.

  During the locking operation of the backrest 3, the base 42 of the backrest 4 tilts up and down around the rotation shaft 5. At this time, since there is a risk that a finger may be caught in the movable part of the backrest 4, the bases 42, 42 of the backrest 4, 4 are made of synthetic resin as shown in FIGS. It is covered with the made-up decorative cover 7 to eliminate the space where the fingers may be inserted.

  Generally, as a guideline in the finger padding prevention process of the movable part, it is fundamental that the clearance is 8 mm or less and 25 mm or more. If this is not possible, it is required not to be injured or hurt even if a finger is caught. The chair in this embodiment is designed in accordance with this guideline.

  As shown in FIG. 11, the decorative cover 7 has a box shape opened upward, and side cover pieces 63, 63 positioned on both sides of the hanging walls 23, 23 of the seat outer 13 on both sides. And a covering portion 64 that wraps from the base portions 42 and 42 of the backrests 4 and 4 extending rearward from the box portion 26 of the seat receiver 10 to the lower portion of the rising portion 43, and has a bottom surface. An opening 66 for receiving the adjustment handle 61 of the elastic urging means 12 is formed in the front part of the cover part 65, and a partition wall part 67 that is in close contact with the rear part of the box part 26 of the seat receiver 10 is formed on the bottom cover part. Standing at 65. And even if it will be in the locking state shown in FIG.13 (b) and FIG.14 (b), the side surface cover pieces 63 and 63 of the said decorative cover 7 will approach the both drooping walls 23 and 23 of the said seat outer 13 and. The partition wall 67 is kept close to or in close contact with the rear portion of the box portion 26 of the seat receiver 10 and closes a gap where a finger fits between them.

  Here, a structure for attaching the decorative cover 7 to a predetermined position will be described. In the decorative cover 7, holding pieces 68 are erected on the jacket portion 64 in parallel with the partition wall portion 67, and locking portions 69 and 69 having arcuate joint portions on both sides of the upper end portion of the partition wall portion 67. The holding piece 68 is also provided with locking portions 70, 70 having arcuate joints on both sides of the upper end portion, and the back outer 21 at the rear end of the jacket portion 64. A projecting piece 71 is formed to be engaged with the lower end inside. Then, when the main body is lifted in a state where the protruding piece 71 of the decorative cover 7 is locked to the inner bottom end of the back outer 21, the partition wall 67 and the holding piece 68 are connected to the left and right backrest ridges 4,4. Inserted while being deformed between the base portions 42, 42, the locking portions 69, 69 of the partition wall portion 67 and the locking portions 70, 70 of the holding piece 68 are in pressure contact with the backrest ridges 4, 4, respectively, on the inner upper side. It locks with. In this state, the side cover pieces 63 and 63 come into close contact with the inner sides of the both hanging walls 23 and 23 of the seat outer 13 (see FIG. 12). When the backrest 3 is unloaded (see FIGS. 13 (a) and 14 (a)), there is no finger between the bases 42 and 42 of the backrest 4 and 4 and the seat outer 13. Sufficient spacing is provided so as not to sandwich the gap. Moreover, the said latching | locking parts 70 and 70 are formed so that it may wrap from the rear-end corner part of the box part 26 of the said attachment body 10 to a side part, and it is trying not to pinch | interpose a finger | toe among them.

  The hanging wall 23 of the seat outer 13 has a tapered shape with a tapering downward in a cross-sectional shape, and not only becomes a draft when forming the hanging wall 23 having a large vertical dimension, but also a side cover piece of the decorative cover 7. It is also a guide surface for receiving 63,63. When the backrest 3 is locked, the hanging wall 23 and the side cover piece 63 are rubbed. In order to reduce the frictional resistance, a plurality of vertical ribs 72,. Is protruding. In this way, the decorative cover 7 completely closes the gap that may pinch the finger in the movable portion with the side cover pieces 63 and 63 and the hanging wall 23, so that it is very safe and the back Since the sides 42 and 42 of the bases 42 and 42 of the rounded ridges 4 and 4 are completely concealed, the appearance is excellent.

1 leg, 2 seat,
3 Backrest, 4 Backrest,
5 rotation axis, 6 operation lever,
7 makeup covers, 8 pedestals,
9 Gas cylinder, 10 Seat receiver,
11 tilting plate, 12 elastic biasing means,
13 seat outer, 14 seat cushion,
15 Zhangji, 16 Armrests,
17 elbow reinforcement, 18 back inner,
19 back cushion, 20 upholstery,
21 back outer, 22 ribs,
23 hanging wall, 24 connecting wall,
25 mounting holes, 26 box parts,
27 reinforcing plate, 28 fixing part,
29 operation pins, 30 fixing screws,
31 Nuts with claws, 32 Shaft,
33 handle part, 34 action part,
35 Lever cap, 36 Bearing part,
37 opening, 38 regulating plate,
39 fitting part, 40 screw,
41 mounting base, 42 base,
43 rising part, 44 mounting plate,
45 fixing plate, 46 mounting hole,
47 mounting pieces, 48 mounting holes,
49 screws, 50 side plates,
51 non-circular holes, 52 circular holes,
53 non-cylindrical part, 54 through-hole,
55 Bush, 56 Flange,
57 bottom plate, 58 adjusting screw shaft,
59 locking member, 60 compression coil spring,
61 adjustment handle, 62 nut member,
63 side cover piece, 64 outer cover part,
65 bottom cover, 66 opening,
67 partition wall, 68 holding piece,
69 locking part, 70 locking part,
71 projecting pieces, 72 vertical ribs.

Claims (3)

In the chair in which the height of the seat can be adjusted by operating the operation lever provided in the seat with the gas cylinder provided in the pedestal standing on the leg, the operation lever is a single metal rod a shaft portion which is rotatably supported from and formed by bending a working portion in a crank shape in the handle portion and the distal end side to the base side of the shaft portion, a synthetic resin seat outer constituting the seat A bearing portion that rotatably fits and holds the shaft portion is formed on the inner side along the hanging wall formed on the back surface of the shaft, and the inside and outside of the hanging wall in the vicinity of the bearing portion communicate with each other. An opening that allows the vertical displacement of the handle portion of the operation lever is formed without dividing the hanging wall, and the operation portion and the shaft portion of the operation lever are inserted into the opening from the outside, and the shaft portion is inserted into the bearing portion. An operating lever mounting device for a chair, wherein the operating lever mounting device is rotatably fitted to the chair. The two bearing portions are formed so as to be coaxial along the inner side of the hanging wall of the outer seat, and the bearing portions form protrusions so as to face the inner ends of the pair of fitting pieces. and are as hereinbefore, the control lever mounting device of the chair according to claim 1, wherein the fitting in a retainer state the shaft portion into the bearing portion. The shaft portion of the operation lever is concealed by attaching a metal seat receiver for attachment to the upper end portion of the gas cylinder in the space between the two hanging walls projecting in parallel to the back surface of the seat outer. The chair operating lever mounting device according to claim 1 or 2 .

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