JPH11190379A - Shock absorber for oscillating member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To regulate a balance at a short time so as to smoothly open an oscillating panel with light force and silently close the oscillating panel without shock. SOLUTION: This shock absorber 24 of an oscillating panel consists of a cylinder 30 in which a magnetic fluid 28 is sealed. A diameter contracting part 32 is formed on a center of the cylinder 30, and a magnet 48 is annually arranged around the diameter contracting part 32. A distance between the magnet 48 and the cylinder diameter contracting part 22 is changed, and thereby, damping force of the cylinder 30 is regulated. Since the self weight of the oscillating panel is balanced with a spring 46, opening/closing speed becomes constant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorber for controlling a swinging movement of a member swinging about a rotation axis.

[0002]

2. Description of the Related Art A structure in which a member swings about a predetermined rotation axis is used in various fields.
For example, in consoles that store electronic consoles and monitoring consoles of various plants, keyboards, displays, interphones, and other electronic devices are mounted on extension tables and panels, and these extended tables and panels are swung to the monitoring consoles and consoles. Mounted as possible.

[0003] A shock absorber is used to alleviate the impact of opening and closing such a swing table or swing panel.
A conventional swing table or swing panel shock absorber is generally a combination of a shock absorber and a spring. For example, in the conventional example shown in FIG. 1, a swing panel 3 on which an extension table 2 is mounted is pivotally mounted on the monitoring console 1, and this swing panel 3 acts upon closing and a shock absorber 4 acting upon opening. Connected to the shock absorber 5.

[0004]

A swing panel or the like on which an electronic device is mounted opens smoothly with a light force when opened.
In addition, it is desirable to close quietly without impact when closing. In the shock absorber of the related art, it is difficult to adjust the balance between the opening movement and the closing movement of the swing panel, and it takes a long time to achieve a fine balance adjustment. In addition, there is a problem that the opening / closing operation is heavy and slow when trying to improve the shock absorbing performance.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a shock absorbing device for a swinging member capable of performing a desired balance adjustment easily and in a short time. Another object of the present invention is to provide a shock absorber capable of opening the swinging member with a light force and capable of relatively reducing the impact at the time of closing.

[0006]

According to the present invention, a shock absorbing device for a swing member has a cylinder in which a magnetic fluid is sealed, and a reduced diameter portion is formed at the axial center of the cylinder. A piston is fitted in the working chamber of the cylinder, and the piston is linked to the swing member. A magnet is annularly arranged around the reduced diameter portion of the cylinder, and an adjusting means for adjusting the distance between the annular magnet and the reduced diameter portion of the cylinder is provided.

With such a configuration, when the swing member swings around its swing axis, the piston in the working chamber is displaced, and the magnetic fluid flows from one working chamber through the reduced diameter portion of the cylinder. Move to the other working chamber. The speed of the opening and closing movement of the rocking member is determined by the resistance when the magnetic fluid passes through the reduced diameter portion of the cylinder. By variably adjusting the distance between the cylinder reduced diameter portion and the magnet, the viscous resistance when the magnetic fluid passes through the cylinder reduced diameter portion can be variably controlled. Thus, the balance adjustment of the buffer function can be performed only by variably adjusting the distance between the cylinder reduced diameter portion and the magnet.

In a preferred embodiment, a spring for compensating gravity acting on the swing member is further provided. With this configuration, the weight of the swing member and the spring force can be balanced, and the swing member can be smoothly opened and closed at a constant speed with a small force.

[0009]

FIG. 2 shows an embodiment in which the present invention is applied to a monitoring console of a plant or a building. Referring to FIG. 2, the monitoring console 10 includes a frame 12, and a swing panel 16 is pivotally mounted on a lower portion of the frame 12 via a hinge 14 so as to be openable and closable about a horizontal axis.

The swing panel 16 has a horizontal extension table 1 on which electronic devices such as a keyboard and a display unit are mounted.
The extension table 18 appears in front of the top panel 22 of the monitoring console 1 by pulling the panel 16 forward along the arrow 20. When the panel 16 is pushed back in the opposite direction to the arrow 20, the top table 22 The extension table 18 is stored underneath.

The opening and closing movement of the swing panel 16 is controlled by a shock absorber 24.
Is controlled by The shock absorber 24 is linked to the swing panel 16 by a flexible rod 26, and is attached to the lower surface of the top plate 22 of the monitoring console 1.

Referring to FIG. 3, the shock absorber 24 has a cylinder 30 filled with a magnetic fluid 28. A reduced diameter portion (constricted portion) 32 is formed at the axial center of the cylinder 30, and a first working chamber 34 and a second working chamber 36 are formed on both sides of the reduced diameter portion 32, respectively.

In the working chambers 34 and 36, a piston 38 is provided.
Are fitted respectively, and the two pistons 38 are connected to one common piston rod 40. The right end of the piston rod 40 extends rightward through the housing 42 of the shock absorber 24, and one end of the flexible rod 26 is connected to the right end of the piston rod 40. The other end of the flexible rod 26, as shown in FIG.
6 so that the piston rod 40 and the piston 38 are displaced as the swing panel 16 is opened and closed.

Still referring to FIG. 3, the piston rod 4
0, a spring receiver 44 is fixed.
A coil spring 46 is mounted between the housing and the housing 42.

A plurality (two in the illustrated embodiment) of magnets 48 are annularly arranged around the reduced diameter portion 32 of the cylinder 30. These magnets 48 are supported by a distance adjusting mechanism 50 so that the distance to the cylinder reduced diameter portion 32 can be adjusted.

Referring to FIG. 4 and FIG.
0 has a pair of support plates 52 fixed to the cylinder 30, and each support plate 52 is provided with a pair of parallel slots 54 spaced apart from each other. A bracket 58 having a hole 56 is appropriately fixed to each magnet 48. Bolts 60 are inserted through these holes 56 and slots 54, and
By adjusting the radial distance of the magnet 48 to the cylinder reduced diameter portion 32 while sliding the bolt 60 along 4 and tightening the bolt 60 at a desired position, the magnet 48 can be fixed so that the distance can be adjusted. .

Next, when the swing panel 16 is opened and closed, the movement is transmitted to the piston 38 via the flexible rod 26, and the movement is transmitted to the piston 38 according to the displacement of the piston 38. The magnetic fluid 28 passes from the working chamber 34 to the working chamber 36 through the cylinder reduced diameter portion 32,
Or it flows in reverse. At this time, since the speed of the magnetic fluid is limited by the resistance of the reduced diameter portion 32, the opening and closing movement of the swing panel 16 is buffered.

The initial setting of the damping force of the shock absorber 24 can be easily performed by loosening the bolt 60 and adjusting the radial distance of the magnet 48 to the cylinder reduced diameter portion 32. When the magnet 48 is brought closer to the cylinder reduced diameter portion 32, the viscous resistance of the magnetic fluid flowing through the reduced diameter portion 32 increases, and the damping force of the shock absorber 24 increases.
The further away from it, the less the damping force.

In use, when the swing panel 16 is pulled out in the direction of the arrow 20 in FIG. 2, the gravity acting on the swing panel 16 increases as the swing angle increases, and the tension acting on the flexible rod 26 increases. Increase. But,
As the flexible rod 26 is pulled to the right in FIG. 3, the spring 46 is compressed and its spring force increases, so that the increasing gravity acting on the swing panel 16 is offset by the increasing spring force of the spring 46.

On the other hand, when the swing panel 16 is closed,
As the swing panel 16 returns to the vertical position, the swing panel 1
As the gravity acting on 6 decreases, the spring force of spring 46 also decreases.

As described above, since the gravity acting on the swing panel 16 and the spring force of the spring 46 are balanced, the opening / closing speed of the swing panel 16 can be kept constant, and the operation can be made smooth.

[0022]

According to the present invention, the balance between the opening movement and the closing movement of the swinging panel can be adjusted easily and in a short time. In addition, the swing panel can be opened with a light force and closed without impact. Further, the opening and closing speed of the swing panel can be made constant, and the operation can be made smooth.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a monitoring console provided with a conventional shock absorber.

FIG. 2 is a side view of a monitoring console provided with the shock absorber of the present invention,
A portion of the side panel of the console is cut away.

FIG. 3 is a sectional view of the shock absorber shown in FIG. 2;

FIG. 4 is a perspective view of a magnet distance adjustment mechanism shown in FIG. 3;

[Explanation of symbols]

 16: Swing panel 24: Shock absorber 28: Magnetic fluid 30: Cylinder 32: Reduced diameter part of cylinder 38: Piston 46: Spring 48: Magnet 50: Magnet distance adjustment mechanism

Claims (2)

[Claims] 1. A shock absorber for controlling a swinging motion of a swinging member, wherein a piston having a reduced diameter portion formed at an axial center of a cylinder in which a magnetic fluid is sealed, and fitted into a working chamber of the cylinder. And a means for adjusting the distance between the reduced diameter portion of the cylinder and the magnet by arranging a magnet in an annular shape around the reduced diameter portion of the cylinder. Moving member shock absorber. 2. The shock absorber according to claim 1, further comprising a spring for compensating gravity acting on the swing member.