JPS6218773B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vibration absorbing device for damping and absorbing external vibrations and self-vibrations, and more specifically,
The present invention relates to a vibration absorbing device that absorbs vibrations in the front-back, left-right, and left-right directions, that is, in the horizontal direction, and also in the vertical direction, that is, in the vertical direction.

In audio equipment or precision equipment, the performance of the equipment may be degraded not only by external vibrations but also by vibrations accompanying the driving of the equipment. For example, in a record player, vibrations from a speaker that reproduces sound from the player may be transmitted through the floor, walls, etc. and applied to the player, causing so-called howling. Such howling also occurs in the speaker box, degrading the quality of the reproduced sound.

To prevent this kind of howling, two
Two pedestal plates are provided, each of these pedestal plates has a concave surface processed, and a supporting plate is fixed so that the concave surfaces face each other, a metal ball is sandwiched between these supporting plates, and the two pedestal plates are attached to the surrounding area. A vibration absorbing device is provided which is elastically coupled by a plurality of springs arranged in the vibration absorbing device. In this vibration absorbing device, the upper pedestal plate, which is supported at one point by a metal ball, rolls around the fulcrum in response to lateral vibrations in the front, rear, left, and right directions, causing the springs around the pedestal to expand and contract. to absorb vibrations. However, this vibration absorbing device has the drawback that it cannot absorb vibrations from the vertical direction. Furthermore, if there are variations in the elastic properties of multiple springs, there is a possibility that vibration absorption will be directional, and it is necessary to firmly connect the two pedestal plates with the springs. However, the tension of the spring is required to be strong, which has the disadvantage of making assembly difficult.

SUMMARY OF THE INVENTION An object of the present invention is to improve the above-mentioned conventional drawbacks, and to provide a vibration absorbing device that absorbs not only horizontal vibrations but also vertical vibrations.

A second object of the present invention is to provide a vibration absorbing device that is easy to assemble and whose vibration absorption characteristics do not deteriorate even after long-term use.

An embodiment of the present invention shown in the drawings will be described below.

This vibration absorbing device includes a first vibration absorbing device 11 that absorbs horizontal vibrations in the front, rear, left, and right directions, and a second vibration absorbing device 12 that absorbs vertical vibrations in the vertical direction. The first vibration absorbing device 11 includes a cylindrical lower seat 14 fitted into an opening of a ring-shaped leg 13 and a ring-shaped upper seat 15 located on the lower seat 14. are doing. The lower seat 14 has a bottomed cylindrical portion 16 that is fitted into the opening.
and a flange portion 17 provided at the upper end of this cylindrical portion 16 are integrally formed, and a ring-shaped permanent magnet 18, for example, is embedded in the upper surface of the flange portion 17. Note that the permanent magnets 18 may be arranged at equal intervals at a predetermined angle on the same circumference. A lower concave plate 19 made of metal and having a concave surface is fitted into the bottom of the opening of the cylindrical portion 16 . A magnetic ring plate 20 such as an iron plate is attached to the lower surface of the upper seat 15 so as to face the permanent magnet 18. The two seats 14 and 15 are separated by the permanent magnet 18 and the magnetic ring plate 20. magnetically coupled. An upper concave metal plate 21 with a concave surface processed is fitted into the lower part of the opening of the upper seat 15, and a thread is cut on the inner surface of the upper part of the opening, and the opening becomes a screw hole 22. ing. Inside the cylindrical portion 16 of the lower seat 14 is a rotatable metal ball 23 whose upper surface has a diameter sufficient to create a gap between the permanent magnet 18 and the magnetic ring plate 20 and which is smaller than the diameter of the cylindrical portion 16. is inserted into. Therefore, this ball 23 is a permanent magnet 18
It is held between the upper part and the upper seats 15 and 14 by magnetic attraction between the upper part and the magnetic ring plate 20. Cylindrical part 1
6 also contains viscous oil 24. An elastic plate 25 made of sponge or rubber is attached to the lower surfaces of the legs 13 and the lower seat 14, so as to absorb vibrations from the installation base (not shown) to some extent.

The second vibration device 12 includes a cylindrical connecting member 32 in which a screw 31 is formed at the lower end to be screwed into the screw hole 22 of the upper seat 15, and the lower end is fitted into the upper peripheral edge of the connecting member 32. It has a cylindrical cover 33. The lower end of an upright piston shaft 34 is screwed into the upper center of the connecting member 32.
A piston 35 is provided at the upper end of the piston shaft 34, and this piston 35 is located within the cover 33. A cylinder 36 having a sufficient length in the axial direction so that its upper end protrudes beyond the upper end of the cover 33 is fitted into the piston 35 . A support base 38 having a flange 37 that receives the load of a record player, a speaker box, etc. is screwed to the upper end of the cylinder 36. Inside the cover 33, one end is in contact with the upper surface of the connecting member 32 and the other end is in contact with the lower surface of the flange 37 of the support base 38, and the support base 3
A coil spring 39 is provided to elastically support 8. The cylinder 36 and the support base 38 are prevented from coming off from the cylinder 36 by a screw 40 screwed onto the piston 35 at the lower end. The screw 40 is loosely inserted into the flange 37 of the support 38, so that the cylinder 36 and the support 38 can move up and down relative to the piston 35. A viscous oil 41 is placed inside the cover 33, and this oil 41 is applied to the piston 35.
The space surrounded by the upper surface of the piston 35 and the inner surface of the cylinder 36 is also filled through the through hole 42 provided in the piston 35 .

Next, the operation of this vibration absorbing device will be explained. When a load is placed on the support base 38, the support base 38 and the cylinder 36 are slightly lowered against the viscosity of the coil spring 39 and the oil 41. This creates a slight gap between the head of the screw 40 and the opening step of the support base 38, and the support base 38 and cylinder 36 are elastically supported in a floating state. If longitudinal vibration is applied to the load, it will be absorbed by the coil spring 39 and the oil 41. Even if the support stand 38 and the cylinder 36 try to move up and down, the oil 41 is also located in the space surrounded by the upper surface of the piston 35 and the inner surface of the cylinder 36. The oil in the space tries to be pushed out, but because the diameter of the through hole 42, which is the exit passage, is small, the oil 41 is pushed out very slowly. Therefore,
This oil also absorbs vibrations in the vertical direction. Also, the upper catch 15 tries to roll around the metal ball 23 due to the lateral vibration, but since the ball 23 is held between the two concave plates 19 and 21, the ball 23 does not rotate. is absorbed. Further, even if the ball attempts to move within the cylindrical portion 16, the movement is damped by the viscosity of the oil 24, and lateral vibrations are absorbed.

As described above, according to the vibration absorbing device of the present invention, vibrations in the horizontal and vertical directions can be completely absorbed. Also, when assembling, it is only necessary to place the upper catch 15 on the lower catch 14, and the permanent magnet 17
Since the magnetic ring plate 20 is magnetically attracted, the upper seat 15 will not shift. Furthermore, since the two concave surfaces 19 and 21 are fitted, they can be easily replaced with another concave plate with a different curvature, and by changing the curvature and the viscosity of the oil, the amplitude and frequency of the braking can be adjusted. It can be changed. Therefore, a wide range of responses is possible. In the vibration absorbing device of the present invention, since the upper catch 15 and the connecting member 32 are connected by screws, the height of the cover 33 can be adjusted by fixing the cover 33 by hand and rotating the upper catch. can do. Adjustments can therefore be made very easily if a load needs to be supported horizontally.

[Brief explanation of the drawing]

The drawing is a sectional view showing an embodiment of the vibration absorbing device of the present invention. DESCRIPTION OF SYMBOLS 11... First vibration absorber, 12... Second vibration absorber, 14... Lower seat, 18... Permanent magnet, 15...
Upper seat, 19... Lower concave plate, 20... Magnetic ring plate, 21... Upper concave plate, 33... Cover, 35... Piston, 36... Cylinder, 39... Coil spring, 41... Oil.

Claims (1)

[Scope of Claims] 1. A vibration absorption device comprising a first vibration absorption device that absorbs vibrations in the lateral direction and a second vibration absorption device that absorbs vibrations in the vertical direction, wherein the first vibration absorption device The device has a ball receiving opening that opens upward in the center and has a concave surface at the bottom, a lower receiving seat having a permanent magnet disposed on the upper end surface of the ball receiving opening, and a lower receiving seat that is housed in the ball receiving opening and has a concave surface formed at the bottom thereof. The upper receiver includes a metal ball having a diameter protruding from the upper surface of the catch, a concave surface that contacts the ball at the center of the lower surface, and a magnetic metal ring plate provided on the lower surface so as to face the permanent magnet. equipped with a seat,
The second vibration device includes a cylindrical body containing viscous oil whose bottomed axial lower end is attached to the upper receiving seat, and which is inserted into the axial upper end of the cylindrical body and has an axial upper end. a cylinder member having a support base for supporting a load at a portion thereof; a piston member having an axially upper end inserted into an axially lower end of the cylinder member and having an axially lower end fixed to a bottom portion of the cylindrical body; an elastic member that is inserted into a gap with the cylinder member and elastically biases both of them in opposite directions, and the oil is also injected into the cylinder through a through hole provided in the piston member. , a vibration absorbing device in which the cylinder is connected to the piston so as to be movable up and down. 2. The vibration absorbing device according to claim 1, wherein the ball receiving opening contains viscous oil, and the vibration absorbing device brakes the lateral movement of the ball with the oil. Device. 3. The vibration absorbing device according to claim 1, wherein the lower end of the cylindrical body is attached to the upper seat by screwing, and the height of the cylindrical body is adjusted by rotating the cylindrical body. The vibration absorbing device is configured as follows. 4. The vibration absorbing device according to claim 1, wherein the elastic member is constituted by a coil spring, an axial lower end of which is connected to the bottom of the cylindrical body, and an axial upper end of which is connected to the upper end of the cylinder member. The vibration absorbing device is in contact with the vibration absorbing device.