JPH0563921B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sliding device using a bush that is capable of sliding along the 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 into a bushing mainly involve linear motion, and the play between the inner diameter of the bushing 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. Further, when two pairs of bushings and guide shafts are provided in parallel 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, on a daily basis, there are many places where such strict linear motion is not required, 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 play is taken between the bush and the guide shaft, it may become distorted and warp may occur, and if there is too much play, the movement may become unstable. In addition, with static sliding devices such as manually operated pull curtains and moving panels, if you try to use the guide shaft in a position other than horizontal, a separate stopping mechanism is required to keep the bushing still in a predetermined position. will have to be established.

The object of the present invention is to eliminate the need for precision fitting between the bushing and the shaft body that guides it, and to ensure that the bushing always slides into contact with the guide shaft and is guided reliably.
Another object of the present invention is to provide a sliding device in which the sliding contact portion has a restraining action.

[Means for Solving the Problems] In order to achieve the above object, the sliding device of the present invention includes a bushing having a magnetized layer on the inner wall side;
It consists of a magnetic shaft with an outer diameter that can maintain sufficient play between the inner diameter of this bushing. The magnetization layer of this bushing 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 approximate inner diameter of the bushing.

[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. , the amount of play 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 is virtually no longer a problem. Even when a pair of bushings and guide shafts are arranged in parallel for guidance, there is no need to make the parallel accuracy of the two guide shafts strict.

(b) Due to the magnetic action that acts between the bush and the shaft, sliding is performed while the bush is attracted to the shaft, so it is stable regardless of the inclination of the shaft, and the drive that makes the bush slide When the force disappears, the bushing is immediately stopped in that position, and even if the shaft is in an upright position, 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 made to stick to each other and become connected.

(d) When a bushing with the same magnetic pole on the inner wall side is inserted into a plurality of shafts arranged at approximately equal intervals along the approximate inner diameter of the bushing, the shafts will become elastic on their own. Since it is attracted to the bush against resistance, a sliding mechanism with no play is formed. Furthermore, since all the attracted shaft bodies are magnetized to the same polarity, they repel each other and try to spread outward.
Press firmly against the inner wall of the bushing. This can act as a stopping mechanism.

[Examples] Examples of the present invention will be described 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.
2,...,12 are shown. 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 portions 13, 13 at the top and bottom. . Here, the lengths of the bushes 12,..., 12 are set to be large enough to exert sufficient magnetic force, but since there is a large play between the inner diameter of the bushes 12,..., 12 and the outer diameter of the shaft body 11, The bushes 12, . Furthermore, Bushiyu 1
By arranging the magnetic poles 2, . . . , 12 with different magnetic poles on opposing surfaces of adjacent partners, they can be accommodated well in the storage position 15. In this case, the fitting precision between the bushes 12, . . . , 12 and the shaft body 11 is not a problem at all. In addition, 16 is the closing curtain,
A panel may be hung for each bush.

Figure 2 shows a second example in which the present invention is applied to a signboard.
In this embodiment, FIG. 2a shows a front view thereof, and FIG. 2b shows a side view thereof. In this figure, 21 is a shaft body, and 22 is a bushing. Here, the steel pipe shaft body 21 is attached to the base 23.
Stand upright and insert the bushing 22. Bushiyu 22
can be easily moved by hand, and will remain in that position when you release your hand. The solid line shows the bushing 22 in a raised and stationary state, and the dashed line shows the bushing 22 in a lowered position. Bushiyu 22 and signboard 24
Information is transmitted by wearing the device and 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.

Figure 3 shows a third example in which the present invention is applied to a blackboard or whiteboard.
In the rear perspective view of the embodiment, 31, . . . , 31 are steel pipe shaft bodies, and 32, . 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,
Multiple shaft bodies 31,..., 31 (three in Fig. 3)
stand upright from the base frame 33, and
2,..., 32, 32a, 32a are inserted.
The bushes 32, .
Since it is slidable in the horizontal direction along with vertical movement, it is always magnetically attached to the shaft body 31 inserted through it, and is in sliding contact with the blackboard or whiteboard while supporting a part of its own weight. The blackboard or white board 34 configured in this manner can be moved up and down freely by hand, and can be held stationary at a desired height as needed to write on the board or to post. Even in this case, bushes 32,..., 32, 32
The desired function can be achieved without undue consideration of the size between the inner diameter of a, 32a and the outer diameter of the shaft bodies 31, . . . , 31 and the parallelism of the shaft bodies 31, . 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. Figure 4a is a side sectional view when the shock absorber is compressed, Figure 4b is a cross-sectional view taken along line B-B in Figure 4a, and Figure 4c is when the shock absorber is fully extended. FIG.

41, . . . , 41 are shaft bodies made of a plurality of steel wire rods (six in FIG. 4) arranged at equal intervals along the inner diameter of the bushing 42, screwed to the bottom plate 43,
It is fixed by suitable means such as welding and inserted into the bushing 42. The bush 42 is magnetized so that the periphery of the inner wall has the same polarity, and is fixed to the inner end of the cylindrical case 45. Cylindrical case 4
A compression coil spring 48 is fitted between the bottom plate 43 and the end plate 47 that closes the outer end of the spring 5 . 44 and 46 are connecting members for attaching to other instruments, and attachment holes 49, 49 are provided therein. FIG. 4a shows a state in which the compression coil spring 48 is compressed by an external force. In this case, there is play between the inner diameter of the bushing 42 and the circumscribed circle summarizing the fixed ends of the shafts 41,..., 41, and the bushing 42
It is selectively in sliding contact with any one of 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 connected to the shaft body 41 through the end plate 47 and the cylindrical case 45 at the same time.
..., 41, so the shaft body 41, ...,
All of the free-sinking ends of 41 are attracted to bushes 42 to apply braking. Furthermore, since the shaft bodies 41, . Therefore, the stopping power is further strengthened. By these things, the bushing 42 and the shaft body 41,
. . , 41, the shock absorber can be constructed without requiring such strict dimensional accuracy. The shock absorber constructed 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 embodiment, a thin film of non-magnetic metal, rubber or synthetic resin may be coated, laminated or bonded. .

Further, the bushing and shaft body do not necessarily have to be cylindrical, and those having a modified elliptical or polygonal cross section can be used.

[Effects of the Invention] As explained above, the sliding device according to the present invention includes 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 distance from the inner diameter of the bushing. With this structure, 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. 2a is a front view thereof; Figure b is a side view thereof. FIG. 3 is a perspective view of a third embodiment of the sliding device of the present invention, seen from the rear, and FIG. 4 is a fourth embodiment of the sliding device of the present invention, and FIG.
is a side sectional view showing a state compressed by an external force, FIG. 4b is a cross-sectional view taken along line B-B in FIG. 4a,
FIG. 4c is a side sectional view showing the state when no external force is applied. 11, 21, 31, 41... shaft body, 12, 22,
32, 42...Bushiyu.

Claims (1)

[Claims] 1. Utilizes magnetism characterized by having a shaft made of a magnetic material and inserted into a bushing having a magnetized layer on the inner wall side and having an outer diameter that maintains sufficient play with the inner diameter of the bushing. sliding device. 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 bodies are a plurality of shaft bodies arranged at approximately equal intervals along the approximate inner diameter of the bushing.