JPS59593Y2 - oil damper - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an oil damper used in scales that make extremely small displacements, such as load cell scales.

Conventional oil dampers often leak oil during transportation of the scale, causing problems with the scale's function.

Therefore, it is troublesome to drain the oil during transportation and refill the oil at the place of use.

This invention provides an oil damper that eliminates the above-mentioned troubles.

This invention will be explained below based on the illustrated embodiments.

FIG. 2 shows a first embodiment. 10 is a piston shaft;
The lower part is integrated with the piston 15, and the upper part is connected by a pin 9 to a scale section which will be described later with reference to FIG.

Reference numeral 17 denotes a cylinder, in which oil 14 is housed, and a piston 15 is immersed in the oil and moves up and down in the oil by a measured load.

The upper part 18 of the cylinder 17 is a bag-shaped ultra-thin rubber-like elastic member 13
The opening of the cylinder 17 is connected to the piston shaft 10, and the piston shaft 10 passing through the member 13a is fixed at its penetrating part, and the inside of the cylinder 17 and the inside of the member 13a communicate with each other, but it is completely disconnected from the outside world. It is blocked.

FIG. 3 shows a second embodiment.

The difference from the first embodiment is that the member 13b corresponding to the member 13a is a bulge-type bellows of ultra-thin rubber.

FIG. 4 shows a third embodiment.

The difference from the first embodiment is that the upper part of the cylinder 17 is formed with a large opening, and is made of rubber-like ultra-thin material having concentric folds at regular intervals in the radial direction to close the opening. The point is that a type diaphragm 13C is provided.

The diaphragm 13C is fixed to the piston shaft 10 at its center, and fixed to the area around the cylinder opening at its outer peripheral edge.

FIG. 5 shows a fourth embodiment.

The difference from the first embodiment is that a small flange-like enlarged part 20 is provided on the upper part 1B of the cylinder 17, and a small flange-like enlarged part 19 is also provided on the piston shaft 10, and a rubber-like ultra-thin bellows. The ends of 13d are fixed to each other.

This is to ensure fixation.

FIG. 6 shows a fifth embodiment.

This is a modified embodiment of the first embodiment, in which member 13 a
The thickness of the lower half of the member 13a' corresponding to 13a' is increased, and the thickness is gradually reduced from the middle, so that most of the upper half is extremely thin.

This is because oil may flow into the member 13a depending on the transportation condition, and if the oil 21 remains when the scale is used as shown in Figure 7, it will affect the measurement. The lower part of the member 13a is given independence so that it can return naturally into the cylinder 17.

Each of the oil dampers described above is used as a damper for a load cell type scale as shown in FIG.

In the figure, 1 is a plate, and the load of an object placed on the plate 1 is transmitted to the load cell 8 via the vertical lever 2, arm 6, and band 7, and the load cell 8 is slightly bent.

The mechanical bending strain is converted into an electrical signal and sent to the measuring section 12.

The main lever 4a and stay 4b have one end connected to pins 3b and 3d provided on a bearing 5, and the other end connected to the vertical lever 2 by pins 3a and 3c.

The plate 1 moves in an arc using the pins 3b and 3d as fulcrums, and if the points of the pins 3a, 3b, 3C, and 3d are connected, they always form a parallelogram.

A piston shaft 10 of the damper is attached to a portion 16 protruding from the back of the vertical lever 2 by a pin 9 at the lower part of the flap.

The dampers installed in this manner will prevent damage to the members 13a, 13b, 13 when the scale is transported or overturned.
Due to the presence of C, 13d or 13a', cylinder 1
There is no possibility that the oil contained within the tank will leak.

Also, in measurement, each member 13 a, 13
b, 13C, 113d, and 13a' are made of a thin rubber-like material, so they do not exhibit any restoring force to return to the original position against slight vertical displacement of the piston shaft. , there is no problem at all.

Therefore, there is no need to take out and take out the oil stored inside the damper attached to the scale during transportation, which saves time and effort.

Another advantage is that the structure is simple and can be manufactured at low cost.

As described above, according to this invention, it is possible to provide an oil damper that is optimal for use in load cell type scales.

[Brief explanation of the drawing]

Figure 1 shows a scale that uses the oil damper of this invention.
2, 3, 4, 5, and 6 are longitudinal sectional views showing different embodiments of this invention, and FIG. 7 is a schematic diagram showing an example.
This figure is a longitudinal sectional view showing the state of the oil damper for explaining the embodiment of FIG. 6. 9...Mounting with pin, 10...Piston shaft, 13 a
, 13b. 13 c, 13 d, 13 a'--Rubber-like membrane member, 14... Oil, 15... Piston, 17...
Cylinder.

Claims (1)

[Scope of utility model registration request] An oil damper comprising a piston immersed in oil housed in a cylinder with an open top, wherein the opening of the cylinder is oil-tightly covered with a rubber-like membrane member, and the membrane member extends upward from the piston. The bag is entirely or partially made of an ultra-thin film, through which the shaft passes through in an oil-tight manner, and the rubber-like film member allows the volume change of the fluid in the cylinder and the minute stroke of the piston with almost no resistance due to its flexure. An oil damper characterized in that it is formed into a bellows shape, a bellows shape, or a pleated diaphragm shape.