JPH0483309A - Sliding device utilizing magnetic properties - Google Patents

Abstract

PURPOSE:To obtain a positive guiding function and stopping function without requiring precision machining for engagement by constituting a spindle body in an outer diameter maintaining a sufficient play with this inner diameter at a bush with a magnetization layer at an inner wall layer for insertion. CONSTITUTION:A title item is constituted by a bush with a magnetization layer at an inner wall side and a spindle body by a magnetic body with an outer diameter for maintaining a sufficient play with this inner diameter. The magnetization layer of this bush may have an inner-periphery surface with a same magnetic pole and also a plurality of spindle bodies may be arranged nearly equally divided along an inner diameter of a large tray of the bush. When using for a coated curtain and using a case with a stage different such as a stage continuously, bushes 12,..., 12 should be sufficiently long for a spindle body 11 of a steel pipe for achieving a sufficient magnetic operation. Also, by providing a large play between an inner diameter and an outer diameter of the spindle body 11, bushes 12,..., 12 can pass curved parts 13, 13 easily and can be parked at a slanted part 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sliding device using a bush that can slide along an axis on the outer surface of a guide shaft constituted by a rod-shaped body or a tubular body. be.

[Prior art] Conventionally, sliding mechanisms that are performed by inserting a guide shaft through a bush mainly involve linear motion, and the play between the inner diameter of the bush and the outer diameter of the guide shaft is extremely small, which is necessary for lubrication. It is normal to set it at a certain level or less. This requires highly accurate processing technology. Furthermore, when two pairs of bushings and guide shafts are provided in parallel in order to cause a moving object to move in a plane, the parallelism of the guide shafts must also be maintained with high accuracy.

On the other hand, there are many places where such strict linear movement is not required on a daily basis, and so the fitting of the bushing and the guide shaft is made to have as much play as possible to lower machining accuracy and reduce costs.

[Problems to be Solved by the Invention] However, depending on how the clearance between the bush and the guide shaft is taken, the bushing may become twisted and warped, and if there is too much clearance, the movement may become unstable. In addition, for static sliding devices such as manually operated sliding curtains and movable panels, if you try to use the guide shaft in a position other than horizontal, you will need a separate stopping mechanism to keep the bushing stationary in a predetermined position. will have to be established.

An object of the present invention is to eliminate the need for fitting precision between the bush and the shaft that guides it, and to ensure that the bush always slides into contact with the guide shaft and is guided reliably. The object of the present invention is to provide a sliding device having a restraining action.

[Means for Solving the Problems] In order to achieve the above object, the sliding device of the present invention includes a bush having a magnetized layer on the inner wall side, and an outer diameter that can maintain a sufficient clearance with the inner diameter of the bush. It consists of a shaft made of magnetic material. The magnetization layer of this bush may have the same magnetic pole on its inner peripheral surface.

Further, a plurality of the shaft bodies may be arranged at approximately equal intervals along the inner diameter of the bush.

[Function] (a) Since a magnetic force is always acting between the bushing and the shaft, a part of the inner surface of the bushing is attracted to a part of the outer surface of the shaft and is always in pressure contact, and there is a gap between these two surfaces. Since the frictional force always acts stably, there is no slight vibration (so-called "chatter") caused by repeated close and detached movements, and rattling is suppressed by the strength of the magnetic force. Therefore, the size of the clearance between the bush and the shaft does not directly affect the sliding operation, and the accuracy of the fitting process between the bush and the shaft does not substantially matter. This means that even when guiding a moving object by arranging two pairs of bushes and guide shafts in parallel, it is not necessary to make the parallel accuracy of the two guide shafts strict.

(b) Due to the magnetic action that acts between the bushing and the shaft, sliding is performed with the bushing adsorbed to the shaft, so it is stable regardless of the inclination of the shaft, and the driving force that moves the bushing is When it disappears, it is immediately stopped in that position, and even if the shaft body is in an upright state, the magnetic force acts effectively to stop the bushing.

(c) When multiple bushings are inserted into one shaft and gathered in one place, if the bushings are inserted so that their opposing magnetic poles are the same, the bushings will repel each other. However, by making different poles face each other, several bushings can be attracted to each other and made into a connected state.

(d) When a bush whose inner wall side has the same magnetic pole all the way around is inserted into a plurality of shaft bodies arranged at approximately equal intervals along the inner diameter of the bushing, the plurality of shaft bodies resist their own elasticity. A sliding mechanism with no play is formed because it is attracted to the bushing. Furthermore, since all the attracted shaft bodies are magnetized to the same polarity, they repel each other and tend to spread outward, strongly pressing against the inner wall of the bush. This can act as a restraining function.

[Example] The present invention will be described in detail below based on the drawings.

FIG. 1 shows a schematic partial view of a first embodiment in which the present invention is applied to a sliding curtain, in which 11 is a shaft body, and bushes 12, . . . , 1
I am guiding you through 2. A steel pipe is used for the shaft body 11, and the one shown in the figure is a mode for continuous use in a stage where there are steps, for example, and the shaft body 11 has curved parts 13, 13 on the top and bottom.
have.

Bush 12 here. . . . Bush 12 has a long length so that it can exert sufficient magnetic force, but bush 12
．． . . , since there is a large play between the inner diameter of the bushing 12 and the outer diameter of the shaft body 11, the bushing 12. ..., 12 is the music part 13.13
It is also possible to park on the slope 14 without difficulty. Furthermore, by arranging the bushes 12, . . . , 12 so that the polarities of the magnetic poles on the opposing surfaces of the adjacent mating members are different from each other, the bushes 12, .

In this case, bush 12. . . ., the fitting precision between 12 and shaft body 11 is no longer a problem. Note that 16 is a sliding curtain, but a panel may be hung for each bush.

FIG. 2 shows a second embodiment in which the present invention is applied to a signboard, and FIG. 2(a) shows a front view thereof, and FIG. 2(b) shows a side view thereof. In this figure, 21 is a shaft body, and 22 is a bush.

Here, the steel pipe shaft body 21 is made to stand upright on the base 23, and the bushing 22 is inserted therethrough. The bush 22 can be easily moved by hand,
If you release your hand, it will remain in that position. The solid line shows the bushing 22 in a lifted and stationary state, and the - dotted line shows the bushing 22 in a lowered position. Sign board 2 on bush 22
4 and transmit information by moving it up and down with your hand. A board 25 is fixed to the base 23 and functions to prevent the sign board 24 from rotating. Further, 26 is a stopper. In this case, even if the inner diameter of the bushing 22 and the outer diameter of the shaft body 21 are made quite loosely, the intended function will not be impaired.

FIG. 3 is a rear perspective view of a third embodiment in which the present invention is applied to a blackboard or whiteboard. ..., 31 is a shaft made of steel pipe, 3
2. ..., 32 and 32a, 32a are bushes. 34 is a blackboard or a white board, which is made of synthetic resin to reduce its weight. In this embodiment, in order to support the weight of the blackboard or whiteboard 34, a plurality of shaft bodies 31.・・・
・, 31 (three in Fig. 3) stand upright from the base frame 33, and the bushes 32°... 32.32a, 32a
is inserted. Bush 32. ..., 32 are fixed to the back side of the white board or blackboard 34, and the bushes 32a, 32
A is inserted into the U-shaped metal fitting 35.35, and is attached to the white board or blackboard 3.
4, but is free to slide in the horizontal direction, it is always magnetically attached to the shaft 31 that is inserted through it, and is in sliding contact with the blackboard or whiteboard 34 while supporting part of its own weight. The blackboard or whiteboard 34 configured in this way can be moved up and down freely by hand.
It can be written on a stationary board and posted at the required height as needed. Even in this case, bush 32.
..., 32.32a.

32a and the shaft body 31. . . , the size of the gap between the outer diameters of 31 and the shaft body 31 . ..., 31, the desired function can be achieved without unnecessarily considering the parallelism.

Such functions can naturally be applied to easels and drafting tables.

FIG. 4 shows a fourth embodiment in which the present invention is applied to a shock absorber. Fig. 4(a) is a side sectional view when the shock absorber is compressed, and Fig. 4(b) is the B-- of Fig. 4(a).
A cross-sectional view taken along line B, and FIG. 4(C) is a side sectional view when the shock absorber is fully extended.

41, ... 41 is a shaft body made of steel wire rods, which is made of a plurality of wires (six in FIG. 4) arranged at equal intervals along the inner diameter of the bushing 42, and is screwed, welded, etc. to the bottom plate 43. It is secured by suitable means and inserted through the bushing 42.

The bush half 42 is magnetized so that the circumference of the inner wall has the same polarity, and is fixed to the inner end of the cylindrical case 45. A compression coil spring 48 is fitted between the end plate 47 that closes the outer end of the cylindrical case 45 and the bottom plate 43. 44 and 46 are connection members for attaching to other instruments, and the attachment holes 4
9.49 is set. FIG. 4(a) shows a state in which the compression coil spring 48 is compressed by an external force.

In this case, the inner diameter of the bushing 42 and the shaft body 41. . . , 41, there is a clearance between the fixed ends of the bushing 42 and the circumscribed circle that generalizes the fixed ends of the bushings 41. . When the external force is removed, the end plate 47 is pressed outward (in the direction of arrow A) by the stored force of the compression coil spring 48 and moves rapidly. However, the bush 42 is also simultaneously connected to the shaft body 41, . . . via the end plate 47 and the cylindrical case 45.
, 41, so the shaft body 41°..., 41
The free ends of the bushings 42 are all attracted to each other to apply braking.

Furthermore, the shaft body 41. ..., 41 are all magnetized to the same polarity, so they tend to repel each other and spread outward,
The bush 42 is pressed even more strongly. Therefore, the stopping power is further strengthened.

By these things, the bush 42 and the shaft body 41°...
The shock absorber can be constructed without requiring the dimensional accuracy of 41 to be very strict. The shock absorber configured in this manner can be used as a door closer, a lifter for opening the lid of a trunk of a passenger car, and the like.

In order to impart wear resistance to the inner surface of the bushing or the outer surface of the guide shaft in the above embodiments, a thin film of non-magnetic metal, rubber or synthetic resin may be coated, laminated or bonded. .

Also, the bushing and shaft body do not necessarily have to be cylindrical,
A modified ellipse or polygonal cross section can be used.

[Effects of the Invention] As explained above, the sliding device according to the present invention is composed of a bushing having a magnetized layer on the inner wall side, and a shaft body made of a magnetic material and having an outer diameter that maintains a sufficient gap with the inner diameter of this bushing. So,
A reliable guiding function can be achieved without requiring precision machining for fitting, and the restraining function can be effectively utilized.

[Brief explanation of the drawing]

FIG. 1 is a schematic partial view of a first embodiment of the sliding device of the present invention, FIG. 2 is a second embodiment of the sliding device of the present invention, and FIG. 2(a) is a front view thereof; FIG. 2(b) is a side view thereof. FIG. 3 is a perspective view of the third embodiment of the sliding device of the present invention seen from the back, FIG. 4 is a fourth embodiment of the sliding device of the present invention, and FIG. 4(a) shows the external force 4(b) is a side sectional view showing the state compressed by
A cross-sectional view taken along the line, and FIG. 4(c) is a side sectional view showing the state when no external force is applied. 11.21.31.41...Shaft body 12.22.32.42...Bushing Fig. 2

Claims (3)

[Claims] (1) A sliding device using magnetism, characterized in that a shaft body made of a magnetic material and having an outer diameter that maintains a sufficient clearance with the inner diameter of the bushing is inserted into a bushing that has a magnetized layer on the inner wall side. . (2) The sliding device using magnetism according to claim (1), wherein the same magnetic poles are arranged on the inner peripheral surface of the bush. (3) The sliding device using magnetism according to claim (2), wherein the shaft body is a plurality of shaft bodies arranged at approximately equal intervals along the approximate inner diameter of the bushing. Device.