JPH08317831A - Shaft device with shaft having direction restituting function and elevatable function - Google Patents

Abstract

PURPOSE: To eliminate deterioration of rotational smoothness and generation of uncomfortable noise by providing cams inclined upward and downward respectively on an upper edge surface of a fixed-bush and a lower edge surface of a movable bush in such a way that the surfaces of the cams are brought into sliding contact with each other, and providing a spring to press down the movable bush. CONSTITUTION: Fitting to a movable bush 21 is made at a position upper than a fixed bush 19 around a shaft 12 in a pipe 3 so as to be able to rotate or elevate with respect to the pipe 3, or so as not to be able to rotate and so as to be able to elevate with respect to the shaft 12. Cams 28, 33 inclined upward and cams 38, 43 inclined downward are arranged on an upper edge surface of the fixed bush 19 and a lower edge surface of the movable bush 21 so that they are brought into slide contact with each other. A spring is set in the pipe 3 so as to press down the movable bush 21. Smoothness in rotation is improved and generation of uncomfotable noise is eliminated accordingly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft device having a shaft having a direction restoring function for automatically returning to the front (forward direction) when an external force is removed and an elevating function capable of ascending and descending by a cylinder device.

[0002]

2. Description of the Related Art Conventionally, according to Japanese Utility Model Laid-Open No. 60-145844, an upward cam having an inclined cam surface on its upper surface is fixed in a cylindrical support pipe standing upright on an underframe, while on the lower surface of a seat plate. A downward cam having a cam surface slidably contacting the cam surface of the upward cam is vertically slidably mounted on a vertically extending shaft rod, and the downward cam is superposed on the upper surface of the upward cam, and the downward cam is installed in a supporting pipe. Disclosed is a chair characterized in that it is configured to be pressed by a spring provided in the above so as to be pressed against an upward cam. In this chair, when there are no seated occupants in the seat, the seat automatically faces the front (forward).
It has a function to return to the direction, that is, a direction restoring function, but does not have an elevating function for the seated person to raise or lower the seat height to suit him. This is because the shaft rod vertically provided on the lower surface of the seat plate is only provided with the direction restoring function by the cam.

Further, since the above-mentioned conventional chair has as a constituent element a direction restoring device by a pair of upper and lower inclined cams,
When the movable-side downward cam rotates due to the rotation of the shaft rod, the contact point of the movable-side downward cam with respect to the fixed-side upward cam is located offset from the shaft rod to one side, and the load is concentrated on the contact point. The contact pressure (braking force) generated between the shaft rod and the surface where the coaxial rod contacts in the state where the load is applied at the position biased to only one side in this way.
And the smoothness of the rotation of the shaft rod is easily deteriorated, and an unpleasant sound (a metallic sound due to a masashi) is easily generated.

[0004]

SUMMARY OF THE INVENTION The first object of the present invention is to provide a novel shaft device having both the above-mentioned direction restoring function and lifting function, and the smoothness of rotation is deteriorated. It is a second object of the present invention to provide a novel shaft device that is devised to eliminate the generation of unpleasant noise.

[0005]

In order to achieve the above first object, a pipe, a shaft which is rotatably and vertically movable in the pipe, and which can be moved up and down by a telescopic operation of a cylinder device; The fixed side bush fitted in the inside of the pipe as a non-rotatable state, and the position above the fixed side bush around the shaft in the pipe that is rotatable and movable up and down with respect to the pipe On the other hand, the movable bush, which is fitted so that it cannot rotate and can move up and down, and the upward inclination that the cam surface slides in contact with the upper edge surface of the fixed bush and the lower edge surface of the movable bush. A cam and a downward tilting cam, and a spring provided in the pipe in a state where the movable side bush is pushed down, and a second object. To this end, a pipe, a shaft that is rotatably and vertically operable in the pipe, and that can be moved up and down by the expansion and contraction operation of the cylinder device, and a fixing that is non-rotatably fitted around the shaft in the pipe The side bush and the portion around the shaft in the pipe above the fixed side bush were fitted so as to be rotatable and vertically movable with respect to the pipe and non-rotatable and vertically movable with respect to the shaft. Outer upward tilting cam and outer downward facing, provided with the cam surfaces in contact with the movable bush and the outer peripheral half of the upper edge of the fixed bush and the outer peripheral half of the lower edge of the movable bush. Inclined cam and half of the fixed bush on the inner edge of the upper edge and half of the movable bush on the inner edge of the lower edge An inner upward cam and an inner downward cam that are inclined in the same angle as the above-mentioned outer upward / downward cams provided so that the cam surfaces are in contact with each other and slide, and a spring provided in a state in which the movable bush is pressed in the pipe. , Are provided.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment shown in the drawings, a pedestal pipe 3 which is erected on a floor surface 1 with screws 2 is constructed, and a thrust bearing 5 is provided in an upper end portion of the pedestal pipe 3 with a C-shaped stop ring 4.
Also, the seats 6 of the gas cylinder device 9 to be described later are respectively fixed in the lower ends of the pedestal pipes 3, and when the self-resetting push pins 7 are opened in the pedestal pipes 3, the upper ends 8 thereof are opened. Is inserted upward by a built-in spring (not shown) and pushed down to the upper end 8 of the same, and is lowered by the external force when the external force is applied to the gas cylinder device 9 and the upper end 8 of the cylinder device 9 is inserted into the thrust. The lower end 11 of the cylinder device 9 is fixed to the seat 6 so as not to be vertically movable and rotatably in a state of protruding upward through the inner diameter hole 10 of the bearing 5, and the vertical operation pipe is provided outside the cylinder device 9. The shaft 12 is slidably attached in the vertical direction along the outer circumference of the cylinder device 9, and the upper end portion 13 of the vertical operation pipe shaft 12 is attached to the upper end portion 8 of the cylinder device 9 by the spring pin 1. Fixed integrally with a, so that further mounting the seat body 16 to be described later to the male tapered extension 15 to the upper end extends above the upper end plane 13 of the vertical operating pipe shaft 12.

A fixed bush 19 having a diameter of the inner diameter hole 18 larger than that of the vertical working pipe shaft 12 is fitted around the vertical working pipe shaft 12 in the pedestal pipe 3, and the fixed bush 19 is fitted. In the pedestal pipe 3, a movable side bush 21 is fixed to the seat 6 via a short tubular auxiliary member 20 so as not to be rotatable and vertically movable and above the fixed side bush 19 around the vertical operation pipe shaft 12 above the fixed side bush 19. Are rotatably and vertically movable, and the spline teeth 2 are attached to the inner peripheral surface of the movable bush 21.
2 are also provided with spline grooves 23 on the outer peripheral surface of the upper and lower operation pipe shafts 12, and these spline teeth 22 and spline grooves 23 are fitted to each other.
9, the low and high places 24 and 25 and the inclined surface 26,
Upward cam 28 consisting of 27 and low and high places 29, 30
And an outer upward cam 33 composed of inclined surfaces 31 and 32, the lower portion 24 of the inner upward cam 28 is set to the lower portion 29 of the outer upward cam 33, and the upper portion 25 of the inner upward cam 28 is set to the upper portion of the outer upward cam 33. At the same height as the location 30, and the inclined surfaces 26, 27 of the inner upward cam 28 are opposite to the inclined surfaces 31, 32 of the outer upward cam 33, and the low / high places 34 are formed on the lower end edge surface of the movable bush 21. 35 is provided with an inner downward cam 38 composed of 35 and inclined surfaces 36 and 37, and an outer downward cam 43 composed of low / high places 39 and 40 and inclined surfaces 41 and 42.
4 and the lower part 39 of the outer downward cam 43 and the higher part 35 of the inner downward cam 38 are at the same height as the higher part 40 of the outer downward cam 43, and the inclined surface 3 of the inner downward cam 38 is
6 and 37 are opposite to the inclined surfaces 41 and 42 of the outer downward cam 43, and a coil spring 45 for pressing the movable bush 21 is interposed between the upper surface of the movable bush 21 and the thrust bearing 5. The leg 46 is configured.

The inside upward cam 28, the downward cam 38, the outside upward cam 33, and the outside downward cam 43 are provided.
The lower part 34 of the inner downward cam 38 is the inner upward cam 2
The height 35 of the inner downward cam 38 is in the low portion 24 of the inner upward cam 28, and the height 39 of the outer downward cam 43 is in the height 30 of the outer upward cam 32 when in contact with the height 25 of 8.
Further, when the high point 40 of the outer downward cam 43 is in contact with the low point 29 of the outer upward cam 33, and the high point 35 of the inner downward cam 38 is in contact with the inclined surfaces 26, 27 of the inner upward cam 28, the downward downward movement is performed. The height 40 of the cam 43 is fixed to the inclined surfaces 31 and 32 of the outer upward cam 33 by the inner upward cam 2.
The height 25 of 8 is the inclined surface 36, 37 of the inner downward cam 38.
Further, the height 30 of the outer upward cam 33 is in contact with the inclined surfaces 41 and 42 of the outer downward cam 43, respectively.

A seat body 49 is fixed to the upper surface of a horizontal portion 48 of a frame 47 which is L-shaped when viewed from the side independently of the leg body 46, and a backrest board 51 is fixed to the front surface of a vertical portion 50 of the seat body 1.
6, a saddle member 52 is fixed to the lower surface of the horizontal portion 48 of the frame 47, and a pair of left and right U-shaped guide groove portions 53, 54 are formed on the lower surface of the saddle member 52 and open inward in the longitudinal direction. The bed member 55 is disposed on the lower surface of the saddle member 52, and the outward protruding edges 56 and 57 are provided on both left and right edges of the bed member 55. Synthetic resin sliding members 58, 5 configured to be slidably fitted in the V-shaped guide groove portions 53, 54.
9 is non-detachably attached, and the attached portions of the sliding members 58, 59 are fitted in the U-shaped guide groove portions 53, 54 to fix the saddle member 52 and the seat body 16 on the bed member 55. The bed member 5 is supported so as to be movable back and forth.
A boss 60 is fixed to the lower surface of the boss 6 at a substantially central position.
The male taper-shaped extension portion 15 is locked in the female taper hole 61 of No. 0 by the engagement concave / convex portions 62, 63 so as to be unrotatable and cannot be removed by tightening a screw (not shown) or the like. Two pairs of front and rear spring hooking holes 65 and 66 are provided at the rear end of 52 and the front end of the bed member 55, and two return springs 67 and 68 that return the saddle member 52 to the front and rear spring hooking holes 65 and 66. The front and rear ends of the saddle member 52 are hooked, and a dogleg shaped leaf spring 70 is arranged on the inner surface of the rear end wall 69 of the saddle member 52, and an intermediate portion thereof is fixed to the wall 69 by a rivet 71. Both ends 72 and 73 are brought into contact with the left and right sides of the rear end of the bed member 55 to muffle the collision sound.

Further, a horizontal shaft 74 is provided horizontally and rotatably in a portion of the bed member 55 near the front end,
The intermediate point of the lever-shaped operation lever 75 is placed on the horizontal shaft 74 in a state where the inner end 76 of the operation lever 75 is placed on the upper end of the push pin 7 via the slide pin 78 and the outer end 77 of the lever 75 is seated. It is fixed as being positioned below the front left portion of the board 49.

When the user is seated frontward on the seat body 16 of the above-described embodiment and the user turns to the side and turns sideways while trying to leave the seat body 16, the seat body 16 moves up and down. The pipe shaft 12, the cylinder device 9 and the movable side bush 21 rotate to the same angle (about 90 degrees) as the turning angle of the body, and the inner downward cam 38 and the outer downward cam 43 of the movable side bush 21 and the inner side of the fixed side bush 19 are rotated. The upward cam 28 and the outward upward cam 33 are displaced by the above angle, and the movable side bush 21 is moved upward by this displacement to contract the coil spring 45. When the user stands up after leaving the sideways position and leaves the seat, the movable bush 21 moves downward due to the extension force of the coil spring 45 contracted in the above, and the inner downward cam 38 and the outer downward cam 43 of the movable bush 21 are separated. The displacement of the fixed side bush 19 from the inner upward cam 28 and the outer upward cam 33 is eliminated, and when the movable side bush 21 is rotated when the displacement is eliminated, the cylinder device 9, the vertical operation pipe shaft 12, and the seat body 16 are moved laterally. It will rotate in the opposite direction and will return to the original orientation (frontward).

In the above embodiment, the lower portion 34 of the inner downward cam 38 and the upper portion of the inner upward cam 28, the upper portion 35 of the inner downward cam 38, the lower portion 24 of the inner upward cam 28, and the outer downward cam 43 are arranged. The seat body 16 faces the front at a position where the low point 39 contacts the high point 30 of the outer upward cam 32 and the high point 40 of the outer downward cam 43 contacts the low point 29 of the outer upward cam 33.

Further, when the seated user moves the upper body backward while seated, the seat body 16 and the saddle member 52 are subjected to the acting force of the return springs 67 and 68 by the moving force of the upper body. When the seat body 16 is moved backwards and leaves the seat, the action of the return springs 67 and 68 causes the seat body 16 to move.
And the saddle member 52 is returned to the front end. Incidentally, the strength of the acting force of the return springs 67 and 68 is set to such a magnitude that the seat body 16 and the saddle member 52 are returned when there is no seated person.

When the outer end 77 of the operating lever 75 is pulled up with a finger, the inner end of the operating lever 75 pushes the push pin 7 through the slide pin 78 to open the push lever. When the push pin 7 is open, the seat body 1
When the weight of the seated person and the external force in the pushing-down direction are not applied to 6, the upper end 8 of the cylinder device 9 rises due to the force of the built-in spring of the cylinder device 9 and the seat body 16 rises and is applied. At the same time, the upper end 8 is lowered and lowered. When the raising operation of the operating lever 75 with the fingers is interrupted while the seat body 16 is being raised or lowered, the push pin 7 returns to the closed state and the upper end 8 of the cylinder device 9 is stopped from rising and lowering. The seat body 16 stops at an intermediate height.

That is, the chair according to the above-described embodiment can automatically return to the front when the seated person disappears, return to the fixed position in the front, and adjust the height by operating the lever.

[0016]

The shaft device according to the first aspect of the present invention includes a pipe, a shaft that is rotatably and vertically movable in the pipe and that can be moved up and down by the expansion and contraction operation of the cylinder device, and the shaft in the pipe. The fixed side bush fitted in a non-rotatable state, and the part above the fixed side bush around the shaft in the pipe that is rotatable and movable up and down with respect to the pipe, and that is not rotatable with respect to the shaft. A movable bush that is fitted so as to be vertically movable, and an upward tilt cam and a downward tilt cam that are provided such that the cam surfaces are in contact with and slide on the upper edge surface of the fixed bush and the lower edge surface of the movable bush. ,
Since it is equipped with a spring that is provided in a state where the movable side bush is pushed down in the pipe, the direction restoration function and the cylinder device that automatically return to the front (forward) when the external force is removed are provided. The shaft device according to claim 2 fulfills both lifting and lowering functions and can completely achieve the first object, and the shaft device according to claim 2 can rotate in the pipe and in the pipe. A shaft that can be moved up and down and that can be moved up and down by expansion and contraction of the cylinder device, a fixed bush that is fitted around the shaft in a non-rotatable state in the pipe, and a fixed bush around the shaft in the pipe A movable bush installed in the upper part so that it can be rotated and vertically moved with respect to the pipe, and cannot be rotated and vertically moved with respect to the shaft. An outer upwardly inclined cam and outer downwardly inclined cam provided with the cam surface on the outer peripheral side half point is in contact with one another in the lower edge face of the outer peripheral half point and the movable bushing upper edge surface of the fixed side bush,
Same as the above-mentioned outer upward / downward cams, which are provided so that the cam surfaces are in contact with each other and slide at the inner peripheral half of the upper end edge of the fixed bush and the inner peripheral half of the lower end of the movable bush. Since the inner upward cam and the inner downward cam inclined at an angle and the spring provided in the pipe in a state of pressing the movable side bush are provided, the contact point between the outer upward cam and the outer downward cam is characterized. Is located on one side of the shaft, and the contact points of the inner upward cam and the inner downward cam are located on the other side of the same axis, and the load is applied to these two contact points in a well-balanced manner. The increase in contact pressure (braking force) between the contact surface and the contact surface can be reduced or eliminated, and the smoothness of rotation of the shaft and the generation of unpleasant noise can be eliminated. And than, those that can be reached complete second object.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a vertical sectional view showing a state in which a seat body is rotated.

FIG. 4 is a vertical cross-sectional view showing the seat body in a retracted state.

FIG. 5 is an exploded perspective view showing the relationship between the vertical operation pipe axis and the boss.

FIG. 6 is an exploded perspective view showing a relationship between a fixed side bush, a movable side bush, and an auxiliary member.

FIG. 7 is a cross-sectional view of a fixed side bush.

FIG. 8 is a sectional view of a movable bush.

FIG. 9 is an enlarged cross-sectional view showing a mounting portion of the seat body to the leg body.

FIG. 10 is a perspective view showing an assembly of a base member and a saddle member.

FIG. 11 is an exploded perspective view showing the assembly.

[Explanation of symbols]

 1 floor surface 2 screw 3 pedestal pipe 4 C type stop ring 5 thrust bearing 6 seat 7 push pin 8 upper end 9 cylinder device 10 inner diameter hole 11 lower end 12 vertical operation pipe shaft 13 upper end part 14 spring pin 15 extension part 16 seat Body 18 Inner diameter hole 19 Fixed side bush 20 Auxiliary member 21 Movable side bush 22 Spline tooth 23 Spline groove 24, 25 Low / high places 26, 27 Inclined surface 28 Inner upward cam 29, 30 Low / high place 31, 32 Inclined surface 33 Outer upward cam 34, 35 Low / high place 36, 37 Inclined surface 38 Inner downward cam 39, 40 Low / high place 41, 42 Inclined surface 43 Outer downward cam 45 Coil spring 46 Leg 47 Frame 48 Horizontal part 49 Seat base 50 Vertical Part 51 Back board 52 Saddle member 53, 54 Guide groove part 55 Bed member 56, 57 Outward protruding edge 58, 59 Sliding member 60 Boss 61 Female taper hole 62, 63 Engaging concave / convex portion 65, 66 Spring hooking hole 67, 68 Return spring 69 Rear end wall 70 Leaf spring 71 Rivet 72, 73 End portion 74 Horizontal axis 75 Control lever 76 Inner end 77 Outer end 78 Slide pin

Claims (2)

[Claims] 1. A pipe, a shaft which is rotatably and vertically operable in the pipe and which can be raised and lowered by expansion and contraction of a cylinder device, and a fixing which is non-rotatably fitted around the shaft in the pipe. Side bush,
A movable bush installed around the shaft above the fixed bush in the pipe so as to be rotatable and vertically movable with respect to the pipe and non-rotatable and vertically movable with respect to the shaft. , An upward tilting cam and a downward tilting cam that are provided so that the cam surfaces are in contact with and slide on the upper end edge surface of the fixed-side bush and the lower end edge surface of the movable-side bush, and the movable-side bush is pressed in the pipe. A shaft device having a shaft having a direction restoring function and a lifting function, which is characterized by including a spring. 2. A pipe, a shaft rotatably and vertically operable in the pipe, which can be moved up and down by expansion and contraction of a cylinder device, and a fixed member fitted in a non-rotatable manner around the shaft in the pipe. Side bush,
A movable bush installed around the shaft above the fixed bush in the pipe so as to be rotatable and vertically movable with respect to the pipe and non-rotatable and vertically movable with respect to the shaft. An outer upwardly inclined cam and an outer downwardly inclined cam, which are provided in such a manner that the cam surfaces are in contact with and slide on the outer peripheral half of the upper end edge of the fixed bush and the outer peripheral half of the lower end of the movable bush. Same as the above-mentioned outer upward / downward facing cams, which are provided in such a way that the cam surfaces are in contact with each other and slide at the inner peripheral half of the upper end edge of the fixed bush and the inner peripheral half of the lower end of the movable bush. An inward upward cam and an downward inward cam that are inclined at an angle, and a spring that is provided inside the pipe in a state in which the movable side bush is pressed down are provided. Shaft device having a shaft having a direction decompression and lifting capability to.