JP5005383B2 - Mounting structure of the operating lever in the chair - Google Patents

Description

  The present invention relates to a mounting structure in which an operation lever for operating an object to be operated in a chair is rotatably attached to a support member in the chair.

In a conventional chair, an operation lever for operating an object to be operated such as a lifting device for a seat or a tilting device for a backrest, a support base for supporting the seat or the backrest, a backrest frame, a lower surface of the seat, etc. It is attached to the support member.
As an example of the mounting structure, for example, the shaft portion of the operating lever in which the tip portion is bent in a crank shape and the gas spring that urges the backrest in the direction of standing up is operated at the bent portion. Is held by a holding bracket screwed to the backrest frame (see, for example, Patent Document 1).
JP 2005-163966 A

  However, in what is described in Patent Document 1, in order to attach the operation lever, the holding bracket must be screwed to the support member, and the screwing work is complicated and takes time and effort to attach. At the same time, there is a problem that the number of parts increases.

  The present invention has been made in view of the above-described problems of the prior art, and has a small number of parts and allows a chair to be easily and reliably attached to a support member without screwing. It is an object of the present invention to provide an operating lever mounting structure.

According to the present invention, the above problem is solved as follows.
(1) A mounting structure in which an operation lever for operating an object to be operated in a chair is rotatably attached to a support member in the chair, and the support member is provided with a notch in a part of a small-diameter shaft hole. And a bearing piece provided with an insertion opening for opening the large-diameter shaft hole laterally with a smaller opening width than the diameter of the large-diameter shaft hole in a part of the large-diameter shaft hole larger than the small-diameter shaft hole. In such a manner that the shaft holes are aligned and spaced apart from each other, and the outer diameter of the operation shaft integral with the operation portion of the operation lever is substantially the same diameter as the large diameter shaft hole. A small-diameter shaft having the same diameter as that of the small-diameter shaft hole is connected to the tip of the operation shaft, and the opening width of the insertion port is formed at a portion spaced from the tip of the operation shaft by a distance smaller than the distance between the bearing pieces. A narrow portion with a smaller width is formed, and the front end portion of the small diameter shaft Providing a protrusion through which the notch can be inserted, the end face of the operation shaft and the protrusion sandwich a bearing piece provided with a small diameter shaft hole, and the small diameter shaft hole supports the small diameter shaft, and the large diameter shaft The operating shaft is supported by the hole.

  (2) In the above item (1), the protrusions on the operation lever and the notches on the bearing pieces are not aligned with each other in the rotation range of the operation lever necessary for operating the object to be operated. Define the positional relationship between and the notch.

  (3) In the above item (1) or (2), a stopper for restricting the rotation range of the operation lever is provided between the operation lever and one of the bearing pieces.

  (4) In any one of the above items (1) to (3), a means for linking with the object to be operated is provided between the tip of the operation shaft and the narrow portion.

According to the present invention, the following effects can be achieved.
According to the first aspect of the present invention, the operating shaft of the operating lever is inserted from the side into the large-diameter shaft hole by passing the narrow portion of the operating shaft through the insertion port, and then the operating shaft is moved in the distal direction. Then, insert the small diameter shaft into the small diameter shaft hole while inserting the protrusion into the notch, and then rotate the operation lever around the operation shaft without screwing the operation lever. It can be easily and reliably attached to the support member.
Further, there is no need to use separate members such as holding metal fittings and fixing screws, and the number of parts can be reduced.

  According to the second aspect of the present invention, the protrusion and the notch are not aligned in the rotation range of the operation lever necessary for operating the object to be operated. There is no possibility that the protrusion moves through the notch and the operation lever falls off the support member.

  According to the third aspect of the present invention, since the rotation range of the operation lever is regulated by the stopper, there is no further possibility that the operation lever falls off the support member.

According to the fourth aspect of the invention, since the operation shaft is supported by the pair of bearing pieces on both sides of the linkage means provided on the operation shaft, the linkage means is stably supported by the support member.
The linking means is integrated with the operation shaft in advance by coupling the operation shaft to the support member in the manner described above as the effect of the invention according to claim 1 in combination with the configuration of the invention according to claim 1. I can keep it.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a front perspective view of a chair provided with an embodiment of the present invention, and FIG. 2 is an exploded front perspective view.
This chair includes a telescopic leg 3 erected at the center of five radial rods 2 each having a caster 1 at the tip, and a support base 4 provided at the upper end of the leg 3. The pivot 5 is inserted into the support base 4 and faces the left-right direction, and a pair of left and right brackets 6 and 6 fixed to both ends of the pivot 5 and the backrest 7 are supported. A pair of left and right forward flanges 8a, 8a extending to the pivot shaft 5 and the bracket 6, and together with them, a backrest frame 8 that rotates with respect to the support base 4; The seat 9 is supported, the rear part is connected to the rear end parts of the pair of left and right brackets 6, 6, and the front part is connected to the front part of the support base 4 with a pair of left and right link levers 10, 10. The seat is adapted to move rearward and downward relative to the support base 4 in conjunction with the backward tilting motion of the backrest frame 8. A frame 11, and a armrest device 12, 12 provided on both side portions of the seat 9.

3 to 5 are exploded perspective views showing the internal mechanism of the support base 4.
This support base 4 has a base portion 13a attached to the upper end of the pedestal 3 and a bent edge portion 13b that protrudes forward and upward from both side portions of the front end of the base portion 13a and that faces inward at the peripheral edge portion. A support frame 13 having a substantially forward U-shape in plan view and having a pair of left and right arm portions 13c, 13c formed is provided.
The base portion 13a is circular so that the upper and lower edges face inward at both sides and the rear portion of the horizontal plate 15 having a receiving hole 14 in which the upper end of the pedestal 3 is press-fit from below at the center. The outer peripheral frame 16 bent in an arc shape is fixed, and the outer peripheral frame 16 is formed to be continuous with the left and right arm portions 13c and 13c.

  Reinforcing plates 17 are respectively fixed to the inner surfaces of the left and right arm portions 13c, 13c in the support base frame 13, and each arm portion 13c and the reinforcing plate 17 form a hollow box-like body to increase the strength. Therefore, it is not necessary to increase the thickness of the material to be used or to use an expensive material.

A bearing cylinder 18 facing in the left-right direction is fixed to the rear part of each arm portion 13c and the reinforcing plate 17, and an end portion of the pivot shaft 5 facing in the left-right direction is pivotally supported by the left and right bearing cylinders 18, 18. Yes.
A pair of left and right torsion coil springs 19, 19 which are urging means for urging the backrest 7 in a direction to stand up are fitted on the pivot 5.
In addition, the front portions of the left and right arm portions 13c and the reinforcing plate 17 support the lower end portions of the pair of left and right link levers 10 and 10 that are parallel to the pivot 5 and support the front portion of the seat 9. A support shaft 20 is provided penetrating in the left-right direction.

  An upper connecting plate 21 and a lower connecting plate 22 are installed between the upper and lower portions of the left and right arm portions 13c, 13c of the support base frame 13 and the reinforcing plates 17, 17, respectively. The biasing force adjusting means 23 of the pair of left and right torsion coil springs 19 and 19 is attached.

  As described above, the support base frame 13 is substantially U-shaped in a plan view, and the reinforcing plates 17 and 17 are attached to the inner surfaces of both the arm portions 13c and 13c. Members such as the pair of torsion coil springs 19 and 19 and the urging force adjusting means 23 can be attached not only from above but also from below or from the front, so that the efficiency of assembly can be improved and the support base 4 The strength of can be increased.

  Furthermore, with the reinforcing plates 17 and 17, torsion coil springs 19 and 19, urging force adjusting means 23, upper and lower connecting plates 21 and 22 and components in the supporting base 4 described later attached to the supporting base frame 13, Since they are covered by the upper cover 24 and the lower cover 25 from above and below, the appearance of the support base 4 is improved in appearance.

Next, the details of the tilting device for the backrest in the support base 4 will be described.
The pivot shaft 5 has circular shaft portions 5a and 5a at both ends, and the other intermediate portion is a square shaft portion 5b. The pivot shaft 5 is disposed on both sides of the angular shaft portion 5b in the space between the left and right reinforcing plates 17 and 17. Are provided at the front ends of both side pieces 26b, 26b that stand up rearward from both side ends of the spring receiving piece 26a facing in the left-right direction in the spring receiving member 26, and the square holes 27, 27 are externally fitted. Are configured to rotate together with the pivot 5 and the backrest 7.

  The left and right torsion coil springs 19 and 19 are symmetric, and a first arm 19b is formed at the outer end of each winding portion 19a by extending the outer terminal of the winding forward from the bottom. A second arm 19c is formed at the inner end of the winding portion 19a. The second arm 19c extends the inner end of the winding from the top toward the front.

As shown in FIGS. 6 to 7, the angular shaft portion 5b of the pivot 5 between the left and right side pieces 26b, 26b of the spring receiving member 26 is fitted to the winding portions 19a of the torsion coil springs 19, 19. A square hole 29 in the guide cylinder 28 is externally fitted.
The guide tube 28 can be separated into an upper half portion 28a and a lower half portion 28b, and a semicircular concave groove 30 is formed on the outer peripheral surface of the central portion in the left-right direction of the upper half portion 28a. On the outer peripheral surface of the central portion in the left-right direction of 28b, a semicircular arc-shaped enlarged diameter rod 31 is provided.

  The outer end portion of the lower half portion 28b with which the first arm 19b of the torsion coil spring 19 abuts in the guide tube 28 and the inward portion of the upper half portion 28a with which the second arm 19c abuts are from the other portions. The other outer peripheral surface of the upper half portion 28a is a tapered surface that gradually decreases in diameter outward from the maximum diameter portion, and the other outer peripheral surface of the lower half portion 28b The tapered surface gradually becomes smaller in diameter from the maximum diameter portion inward. In some cases, a stepped shape or the like is used instead of the tapered surface.

  As shown in FIG. 8, the first arm 19b and the second arm 19c of each torsion coil spring 19 are always in contact with the outer peripheral surface of the guide cylinder 28, and a wedge-shaped space gradually expanding as the distance from the contact portion increases. The space is formed between the inner surface of the winding portion 19a of each torsion coil spring 19 and the outer peripheral surface of the guide tube 28, and this space allows the diameter of each torsion coil spring 19 to be reduced when tightened. ing.

Accordingly, the upper and lower arms 19b and 19c of each torsion coil spring 19 are always guided in contact with the guide cylinder 28 even if they extend in the same direction, and the torsion coil spring 19 is twisted in the up and down direction. Without floating, it is supported stably and the reaction force as set is obtained.
In addition, since the first arm 19b and the second arm 19c of each torsion coil spring 19 are both extended in the same direction from the winding portion 19a, the torsion coil spring 19 itself, a portion for accommodating the torsion coil spring 19 and the like The size can be reduced by reducing the size in the front-rear direction.
Further, each torsion coil spring 19 can be smoothly expanded and contracted along the tapered surface of the guide tube 28.

  The first arms 19b of the left and right torsion coil springs 19 and 19 are locked so as to abut on both sides of the upper surface of the spring receiving piece 26a of the spring receiving member 26, and the second arm 19c is a biasing force adjusting means. 23 is engaged with the lower surface of the spring receiving member 32.

The urging force adjusting means 23 is substantially pivotally supported between the central portions of the upper connecting plate 21 and the lower connecting plate 22 and is rotated by a rotary handle 33 provided below the lower connecting plate 22. A pair of screw rods 34 facing upward and downward, an elevating piece 36 having a screw hole 35 screwed into the screw rod 34 in the center, and a roller-like pair pivoted on the left and right side surfaces of the elevating piece 36 The above-described spring receiving members 32, 32 are included.
When it is not necessary to adjust the urging force of the torsion coil springs 19, 19, a spring receiving member is provided on the upper end of a traction rod (not shown) whose lower end is locked to the lower connecting plate 22 instead of the screw rod 34. 32, 32 can also be carried out.

The spring receiving member 26 is urged downward by the left and right torsion coil springs 19, 19 and is normally stopped in contact with a stopper 37 provided on the upper surface of the lower connecting plate 22. The backrest 7 is in an upright state.
From this state, when the seated person pushes the backrest 7 backward, the backrest 7 is integrated with the pivot 5, the spring receiving member 26, etc. against the urging force of the left and right torsion coil springs 19, 19. The biasing force of the torsion coil springs 19 and 19 acts as a return turning force of the backrest 7 in the standing direction.

This return turning power can be adjusted by the biasing force adjusting means 23.
That is, when the screw rod 34 is rotated by the rotary handle 33 and the elevating piece 36 is lowered, the left and right torsion coil springs 19 and 19 are synchronously tightened, and the urging force of the backrest 7 in the standing direction. On the contrary, when the elevating piece 36 is raised, the left and right torsion coil springs 19 and 19 are loosened synchronously, and the urging force of the backrest 7 in the standing direction is weakened.

Next, details of the locking device 38 that locks the backrest 7 at a desired stepwise inclination angle will be described.
As shown in FIGS. 3, 5, and 9, the lock device 38 includes a plurality of engagement holes 39 in the left reinforcing plate 17 of the support base 4 that is a support member, and a spring receiving member 26 that is a movable member. A lock pin 40 that is arranged in an arc shape centering on the pivot 5 that is the moving direction of the movable member and that can be selectively engaged with and disengaged from the plurality of engagement holes 39 is attached to the spring receiving member 26 that is a movable member. An operating lever as an operating means is mounted so as to be movable between a locked position shown in FIG. 9C engaged with the joint hole 39 and an unlocked position shown in FIG. The wire end member 42 as an actuating member that is moved by the operation of 41 is set to a lock reservation position shown in FIGS. 9B and 9C and an unlock reservation position shown in FIGS. 9A and 9D. It is mounted as movable, and the wire end member 42 is When the wire end member 42 is located at the unlock reserved position, the lock pin 40 is directed toward the unlock position. The urging means 43 for urging is provided on the spring receiving piece 26 a of the spring receiving member 26.

The lock pin 40 is slidably fitted in a rectangular tubular case 44 that is provided on the spring receiving piece 26 a of the spring receiving member 26 and faces in the left-right direction, and the left end portion is located on the left side of the spring receiving member 26. It penetrates the side piece 26b and can advance and retreat outward.
A sliding body 45 that is externally fitted near the right end of the lock pin 40 so as to be slidable in the left-right direction passes through a long hole 46 provided in the upper surface of the case 44 and faces the left-right direction, and protrudes above the case 44. The inside of the long hole 46 can be slid in the left-right direction.

  A tube holder 47 is fixed to the left end of the long hole 46 on the upper surface of the case 44, and the spring receiving piece 48 protruding from the lower surface of the tube holder 47 enters the case 44 through the long hole 46. is doing.

An intermediate diameter portion of the lock pin 40 is provided with an enlarged diameter flange portion 49 made of an E-ring. A wire end member as an operation member is provided around the lock pin 40 between the enlarged diameter flange portion 49 and the sliding body 45. A compression coil spring 50 serving as a first urging means for urging the lock pin 40 toward the lock position when the lock position 42 is located at the lock reservation position is contracted, and the diameter-enlarged flange 49 Around the lock pin 40 between the spring receiving piece 48 and the spring receiving piece 48, when the wire end member 42 is positioned at the unlock reserved position, the second bias is applied to bias the lock pin 40 toward the unlock position. A compression coil spring 51 forming a means is contracted.
The spring constant of the compression coil spring 50 that is the first urging means is larger than the spring constant of the compression coil spring 51 that is the second urging means. 43 is formed.

An operation lever 41 that is an operation means and a wire end member 42 that is an operation member are connected by a Bowden cable 52.
The Bowden cable 52 has one end fixed to the tube holder 59 fixed to the right side surface of the pivot member 53 in the support base 4 on which the operation shaft 41a of the operation lever 41 is pivotally supported, and the other end to the tube holder. A flexible outer tube 54 fixed to 47 and an end portion that is slidably inserted in the outer tube 54 in the axial direction and drawn from one end of the outer tube 54 are integrated with the tube holder 59. The guide is guided along the arcuate outer peripheral surface of the wire guide 60 formed at the end, and the terminal is locked to the distal end portion of the first arm 41b protruding forward from the proximal end side of the operation shaft 41a of the operation lever 41. The end of the outer tube 54 drawn out in parallel with the moving direction of the lock pin 40 passes through the slit 55 provided in the upper part of the sliding body 45 and facing in the left-right direction. , The tip is made from wire 57 which is fixed to the wire end member 42 which is accommodated in the accommodation hole 56 provided on the upper right side of the sliding body 45 continuous with the slit 55.
The pivotal support member 53 has a U-shape that faces downward when viewed from the front, and the front portion is fixed to the center of the lower surface of the upper connecting plate 21.

  Since the operation lever 41 and the wire end member 42 are connected by the Bowden cable 52, when the operation lever 41 is located at the unlock position facing forward, the wire end member 42 is reserved for unlocking. When the operation lever 41 is rotated to the lock position facing the front lower side from the position, the wire end member 42 is moved to the lock reservation position.

Next, the operation of this locking device will be described.
When the operation lever 41 is located at the unlock position, as shown in FIG. 9A, the wire end member 42 is located at the unlock reserved position. In this state, the left and right compression coil springs 51 are located. , 50 extend together, and the lock pin 40 is located at the unlock position and is disengaged from any of the engagement holes 39.

  In this state, when the seated person pushes the backrest 7 backward, the backrest 7 is integrated with the pivot 5, the spring receiving member 26, etc. against the biasing force of the left and right torsion coil springs 19, 19. The backrest 7 can be freely tilted about the pivot 5 and when the pressing force behind the backrest 7 is released, the backrest 7 is brought into the original standing state by the urging force of the left and right torsion coil springs 19 and 19. It is returned and rotated.

  From this state, after tilting the backrest 7 to the desired backward tilt position, when the operation lever 41 is switched to the lock position, the wire end member 42 moves to the lock reservation position as shown in FIG. 9B. Thus, the sliding body 45 is moved to the left, the compression coil spring 50 is compressed, and the lock pin 40 is urged to the left.

  At this time, if the lock pin 40 is aligned with any one of the engagement holes 39, the lock pin 40 is immediately fitted into the engagement hole 39, and the locked state shown in FIG. When the lock pin 40 is not aligned with any of the engagement holes 39, the tip of the lock pin 40 comes into contact with the inner surface of the reinforcing plate 17, and as shown in FIG. Will remain compressed.

  Thereafter, when the backrest 7 is slightly tilted forward or backward, the compression coil spring 50 is extended and the compression coil spring 51 is compressed, so that the lock pin 40 is fitted into the closest engagement hole 39. 9C, the backrest 7 is locked at that position.

If the operation lever 41 is switched to the unlock position while the seated person is leaning on the backrest 7 from such a locked state, the wire end member 42 is moved to the unlock reserved position as shown in FIG. However, since a load is applied to the backrest 7, the distal end portion of the lock pin 40 cannot be detached from the engagement hole 39 and is held in the locked position.
At this time, the compression coil spring 51 remains compressed, and the compression coil spring 50 extends to a substantially no-load state and pushes the sliding body 45 slightly to the right. The sliding body 45 stops at the position shown in FIG. 9 (d), and only the wire end member 42 is detached from the accommodation hole 56. When the friction between the wire end member 42 and the inner surface of the accommodation hole 56 is large, the sliding body 45 moves to the right together with the wire end member 42 and may be separated from the compression coil spring 50.

  Thereafter, when the backrest 7 is slightly tilted forward or backward, the compression coil spring 51 is extended, and the lock pin 40 is detached from the engagement hole 39, and the original unlocking shown in FIG. Return to position.

As shown in FIGS. 3 and 5, an operation lever 58 for adjusting the height of the support base 4 is provided at the rear upper part of the support base 4 so as to be symmetrical with the operation lever 41.
Next, with reference to FIGS. 3 to 5 and FIGS. 10 to 14, a structure for attaching these operation levers 41 and 58 to the support base 4 will be described.

  A small-diameter shaft hole 61 is provided on both side pieces 53a, 53a of the pivot member 53 in the support base 4 serving as a support member, and square notches 62, 62 are provided in front and rear portions of the small-diameter shaft hole 61. The right side piece 53a is a bearing piece for bearing the inner end portion of the operation lever 41, and the left side piece 53a is a bearing piece for bearing the inner end portion of the operation lever 58.

  A screw hole 63 is provided in front of the small diameter shaft hole 61 in each side piece 53a, and a positioning hole 64 is also provided in the rear.

A bearing piece 64 is provided on the rear upper part of the left and right reinforcing plates 17, 17 so as to face the side piece 53 a. The bearing piece 64 has a larger diameter than the small-diameter shaft hole 61. A large-diameter shaft hole 66 and an insertion port 67 for opening the rear portion of the large-diameter shaft hole 66 rearward with an opening width smaller than the diameter of the large-diameter shaft hole 66 are provided.
The small-diameter shaft hole 61 and the large-diameter shaft hole 66 are aligned with each other in the left-right direction and are separated by a required distance D1 as shown in FIG.

As shown in FIGS. 3 and 10, the operating lever 41 is fitted so that it can rotate smoothly without rattling in the large-diameter shaft hole 66, that is, substantially the same as the inner diameter of the large-diameter shaft hole 66. An operation shaft 41a having an outer diameter that can be combined, a first arm 41b that protrudes forward from the base end side, and a plate that is integrally connected so as to face obliquely forward from the outer end of the operation shaft 41a The operation portion 41c is connected to the inner end of the operation shaft 41a and is substantially the same as the inner diameter of the small-diameter shaft hole 61. That is, the small-diameter shaft hole 61 can be smoothly rotated without rattling. A small-diameter shaft 41d having an outer diameter that can be fitted and a second arm 41e that protrudes from the outer peripheral surface of the operation shaft 41a so as to be substantially perpendicular to the first arm 41b.
The first arm 41b serves as a linkage means with the lock device 38, which is an operated body.

  Further, as shown in FIG. 10, the portion separated from the inner end of the operation shaft 41a of the operation lever 41 by the distance D2 smaller than the distance D1 forms a pair of planing surfaces on the outer peripheral surface, thereby The narrow portion 41f has a width W2 smaller than the opening width W1 of the insertion port 67.

  Further, on the outer periphery of the tip end portion of the small-diameter shaft 41, protrusions 68 and 68 through which these can be inserted are provided so as to correspond to the notches 62 and 62.

  Thus, the operation lever 41 inserts the operation shaft 41a into the large-diameter shaft hole 66 from the side by passing the narrow portion 41f of the operation shaft 41a through the insertion port 67, and then moves the operation shaft 41a inward. The small-diameter shaft is moved while passing through the hole 60a provided in the wire guide 60 that is temporarily fixed to the right side surface of the pivot member 53 in advance and inserting the protrusions 68 and 68 into the notches 62 and 62. 41d is inserted into the small-diameter shaft hole 61 of the pivot member 53, and then the operation lever 41 is rotated by an appropriate angle about the operation shaft 41a, so that the screwing operation can be performed easily and reliably. It can be attached to the support base 4 which is a support member.

  The operation lever 41 attached to the support base 4 as described above has the end surface of the operation shaft 41a and the projections 68 and 68 so as to sandwich the right side piece 53a of the pivot support member 53 in the axial direction. It is constrained to be immovable and is supported by its side piece 53a and the bearing piece 65 in a stable and rotatable manner.

  A stopper pin (stopper) 69 has a fixing screw 70 screwed into the screw hole 63 so as to be positioned between the first arm 41 b and the second arm 41 e in the operation lever 41, together with the wire guide 60 and a pivot member. By being fastened to the right side piece 53a of 53, the operating lever 41 loosens the wire 57 and the locked position where the second arm 41e contacts the stopper pin 69 while the wire 57 is pulled. In this state, the first arm 41b can be rotated to the unlocked position where the first arm 41b contacts the stopper pin 69, and the protrusion 68 is notched within the range of rotation from the locked position to the unlocked position. 62 does not match.

  Therefore, during the turning operation of the operation lever 41, the protrusion 68 does not move through the notch 62, and the operation lever 41 does not fall off the support base 4.

  A terminal of a winding of a click spring 71 that is a torsion coil spring is locked to the first arm 41a and the pivot member 53, and the click lever 71 locks the operation lever 41 from an intermediate position in the rotation range. When it moves to the position side, it is biased toward the lock position, and when it moves to the unlock position side, it is biased toward the unlock position, and is stably held at the lock position and the unlock position. It is like that.

  As with the operation lever 41, the operation lever 58 has an operation shaft 58a having an outer diameter substantially the same as the inner diameter of the large-diameter shaft hole 66, a first arm 58b projecting downward from the base end side, and an operation lever 58. The plate-like operation portion 58c integrally connected so as to face obliquely forward from the outer end of the shaft 58a, and the inner diameter of the small-diameter small-diameter shaft hole 61 connected to the inner end of the operation shaft 58a. And a second arm 58e protruding from the outer peripheral surface of the operation shaft 58a so as to face the first arm 58b at a substantially right angle.

  Further, the operation shaft 58a of the operation lever 58 is provided with a narrow portion 58f similar to the narrow portion 41f of the operation shaft 41a of the operation lever 41, and a third arm 58g not provided on the operation lever 41 is located upward. It protrudes so as to face.

  The operation lever 58 is attached to the left side piece 53a of the pivot member 53 and the left bearing piece 65 with the same structure symmetrical to the operation lever 41 and the same assembling procedure.

  As shown in FIG. 14, the operating piece provided at the tip end portion of the first arm 58 b in the operation lever 58 and the upper end portion projecting upward from the base portion 13 a of the support base frame 13 in the gas spring 72 forming the pedestal 3. 73 is connected with a wire 74, and the operating lever 58 is rotated counterclockwise in FIG. 14, whereby the wire 74 is pulled, the operating piece 73 is tilted forward, and the gas spring 72 is It is in a free state and can be extended by the biasing force of the built-in spring.

When the support base 4 is lifted or lowered to a desired height and the hand is released from the operation lever 58, the operating piece 73 is returned to the standing state by the spring force for return inside, and the gas spring 72 is locked in the extended state at that time.
Further, as the operating piece 73 returns to the standing state, the operation lever 58 is returned to the original position.

  A stopper pin 75 serving as a restricting means has a fixing screw 76 that is screwed into the screw hole 63 so as to be positioned between the second arm 58e and the third arm 58g of the operation lever 58. When the operating lever 58 is fixed to the side piece 53 a, the rotation range of the operating lever 58 is restricted to a range necessary and sufficient for pulling the wire 74. The operation lever 58 does not fall off the support base 4 by moving through the notch 62.

As is clear from the above, in this embodiment, the operation levers 41 and 58 can be easily and reliably attached to the support base 4 as a support member without performing a screwing operation.
Further, there is no need to use separate members such as holding metal fittings and fixing screws, and the number of parts can be reduced.

The present invention is not limited to the above-described embodiment, and can be implemented in a modified form without departing from the scope of the claims.
For example, the operation levers 41 and 58 can be attached to the lower surface of the seat 9 as a support member, the forward saddle 8a of the backrest frame 8 or the like with the same structure and assembling procedure.

It is a perspective view of a chair provided with one embodiment of the present invention. Similarly, it is an exploded perspective view. It is a disassembled perspective view of a support base. It is a disassembled perspective view when a part of support base is assembled. It is a disassembled perspective view when assembling most of the support base. It is a perspective view when a guide cylinder is externally fitted to the pivot. Similarly, it is a front view. Similarly, it is a longitudinal front view. (a)-(d) is an effect explanatory view which shows the operation state from which a locking device differs mutually. It is the disassembled perspective view which looked at the support base for showing the attachment structure of an operation lever from diagonally right back. Similarly, it is the disassembled perspective view which looked at the support base from diagonally left rear. Similarly, it is a rear view. It is a vertical side view along the XIII-XIII line of FIG. It is a vertical side view along the XIV-XIV line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Caster 2 Leg rod 3 Leg column 4 Support base 5 Pivot 5a Circular shaft portion 5b Square shaft portion 6 Bracket 7 Backrest 8 Backrest frame 8a Forward facing 9 Seat 10 Link lever 11 Seat receiving frame 12 Armrest device 13 Base frame 13a Base portion 13b Bending edge 13c Arm portion 14 Receiving hole 15 Horizontal plate 16 Outer peripheral edge 17 Reinforcement plate 18 Bearing cylinder 19 Torsion coil spring 19a Winding portion 19b First arm 19c Second arm 20 Support shaft 21 Upper connecting plate 22 Lower connecting plate 23 urging force adjusting means 24 upper cover 25 lower cover 26 spring receiving member 26a spring receiving piece 26b side piece 27 square hole 28 guide tube 28a upper half part 28b lower half part 29 square hole 30 concave groove 31 enlarged diameter rod 32 spring receiving member 33 Rotating handle 34 Screw rod 35 Screw hole 36 Lifting piece 37 Stopper 38 Locking device 39 Engagement hole 40 Lock pin 41 Operation lever 41a Operation shaft 41b first arm (linkage means)
41c operation portion 41d small diameter shaft 41e second arm 41f narrow width portion 42 wire end member (operation member)
43 Energizing means 44 Case 45 Sliding body 46 Long hole 47 Tube holder 48 Spring receiving piece 49 Expanded flange 50 Compression coil spring 51 Compression coil spring 52 Bowden cable 53 Pivoting member 53a side piece (bearing piece)
54 outer tube 55 slit 56 accommodation hole 57 wire 58 operating lever 58a operating shaft 58b first arm (linking means)
58c operation portion 58d small diameter shaft 58e second arm 58f narrow width portion 59 tube holder 60 wire guide 60a hole 61 small diameter shaft hole 62 notch 63 screw hole 64 positioning hole 65 bearing piece 66 large diameter shaft hole 67 insertion port 68 protrusion 69 Stopper pin (stopper)
70 fixing screw 71 click spring 72 gas spring 73 operating piece 74 wire 75 stopper pin (stopper)
76 Fixing screw

Claims (4)

  A mounting structure for rotatably mounting an operation lever for operating an object to be operated in a chair on a support member in the chair, wherein the support member has a bearing piece provided with a notch in a part of a small-diameter shaft hole, A bearing piece provided in a part of a large diameter shaft hole larger than the small diameter shaft hole, with an opening width smaller than the diameter of the large diameter shaft hole, and provided with an insertion port for opening the large diameter shaft hole to the side. The shaft holes are aligned and spaced apart from each other, and the outer diameter of the operation shaft integrated with the operation portion of the operation lever is made substantially the same as the large diameter shaft hole. A small-diameter shaft having the same diameter as that of the small-diameter shaft hole is continuously provided at the tip, and a width smaller than the opening width of the insertion port at a portion of the operation shaft that is separated from the tip by a distance smaller than the distance between the two bearing pieces. Is formed on the outer periphery of the tip of the small-diameter shaft. A projecting portion through which the shaft can be inserted, a bearing piece provided with a small-diameter shaft hole is sandwiched between the end surface of the operating shaft and the projecting portion, and a small-diameter shaft is supported by the small-diameter shaft hole, and An operating lever mounting structure in a chair, wherein the operating shaft is bearing.   The positional relationship between the protrusion and the notch is determined so that the protrusion on the operation lever and the notch in the bearing piece do not align in the rotation range of the operation lever necessary for operating the object to be operated. The operation lever mounting structure in the chair according to claim 1.   The structure for mounting an operation lever in a chair according to claim 1 or 2, wherein a stopper for restricting a rotation range of the operation lever is provided between the operation lever and any one of the bearing pieces.   The operation lever mounting structure for a chair according to any one of claims 1 to 3, wherein a means for linking with an object to be operated is provided between the tip of the operation shaft and the narrow portion.

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