JPS5916803Y2 - Water pressure waterproof dial gauge - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a water-pressure-proof and waterproof dial gauge that is used at a certain depth of water.

Traditionally, dial gauges include the outer end of the spindle,
Both ends of an elastic cylindrical body that is loosely fitted around the spindle are fitted onto the outer surface of the stem that slidably holds the spindle in the main body, so that water can be drawn into the main body from between the spindle and the stem. Some products are designed to prevent the intrusion of foreign substances.

When such a waterproof dial gauge is used in shallow water, the cylindrical body maintains a certain shape due to its own elasticity, but when the water gets to a certain depth, it is crushed by water pressure and clings tightly to the stem and spindle. I did it,
There was a problem that impaired the smooth movement of the spindle.

Furthermore, in this case, there is a risk that water may enter the cylindrical body from between the cylindrical body and the spindle and stem.

The present invention provides a water pressure and waterproof dial gauge that solves these problems.

An embodiment of the present invention will be described below with reference to FIG.

In the drawing, 1 is a cylindrical body of a dial gauge; 2;
3 is a stem provided integrally with the main body 1; 4 is a spindle that penetrates the main body 1 and is slidably held in the stems 2 and 3; The image is enlarged and displayed on the display section 5 via a gear enlarging mechanism (not shown) and a pointer (not shown) interlocked with the gear enlarging mechanism.

6 is a probe attached to the tip of the spindle 4.

A bellows-shaped elastic cylindrical body 7 made of rubber, synthetic resin, or the like is loosely fitted around the outer periphery of the tip of the spindle 4 .

Both ends of this cylindrical body 7 are formed to have a smaller diameter than the central part, and are tightly fitted to the stem 2 and spindle 4 by their own elasticity.

Similarly, a bellows-shaped elastic cylindrical body 8 made of rubber or synthetic resin is loosely fitted around the outer periphery of the base end of the spindle 4, and both ends of the elastic cylindrical body 8 are elastically connected to the squirrel rubber 3 and the spindle 4. is tightly fitted.

A hole 10 is bored in the back surface of the main body 1 to communicate a chamber 9 inside the main body 1 with the outside.

This hole 10 is hermetically sealed by a diaphragm 11 whose peripheral edge is fixed to the inner surface of the back surface of the main body 1.

When a dial gauge with this configuration is used underwater,
The diaphragm 11 is displaced toward the chamber 9 as indicated by the broken line in the figure, the air within the chamber 9 is compressed, and the pressure within the chamber 9 is increased.

The pressure in this chamber 9 is introduced into the cylindrical bodies 7, 8 through the gap between the spindle 4 and the stems 2, 3, and as a result, the pressure difference between the inside and outside of the cylindrical bodies 7, 8 becomes small. , cylindrical body 7,
8 will maintain its shape due to its own elasticity even if the water depth increases to a certain extent.

In the embodiment described above, the hole 10 is sealed by the diaphragm 11, but the structure is not necessarily limited to this. It may also be configured such that a bellows tube 14 is formed inside the cylindrical portion 12 and a bellows tube 14 whose tip end is closed with a cap 13 is fitted onto the outer peripheral surface of the cylindrical portion 12 .

This dial gauge can have a larger displacement amount of the bellows tube 14 than the diaphragm 11 of the above-mentioned embodiment, so it can be used at deeper water depths than the dial gauge of the above-mentioned embodiment.

As explained above, the present invention has a hole in the main body of the waterproof dial gauge, and this hole is connected by a member (e.g. diaphragm, bellows tube) that can be displaced from the higher pressure side to the lower pressure side due to the pressure difference inside and outside the main body. Since it has a sealed structure, when water pressure acts on this diaphragm, the air inside the main body is compressed and the internal pressure increases, and this pressure is inside the cylindrical body that maintains airtightness between the stem and spindle. acts on,
The pressure difference between the inside and outside of this cylindrical body becomes smaller.

This has the effect that the cylindrical body can maintain its own shape due to its own elasticity without being crushed even under water pressure that would otherwise collapse the cylindrical body.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view of a dial gauge showing one embodiment of the present invention, and FIG. 2 is a partially sectional view of a dial gauge showing another embodiment of the present invention. 1...Main body, 2, 3...Stem, 4.
...Spindle, 7゜8...Cylindrical body, 1
0.10'... Hole, 11... Diaphragm, 14... Bellows tube.

Claims (1)

[Scope of utility model registration request] A waterproof dial in which both ends of a stretchable cylindrical body loosely fitted around the spindle are tightly fitted to the outer end of the spindle and the outer surface of the stem that slidably holds the spindle in the main body. In the gauge, an opening is provided in the main body, a retractable pressure receiving part having an elastic member is provided in the opening, and the pressure receiving part is communicated with an elastic cylindrical body between the stem and the spindle via the main body and the stem, Moreover, the water pressure and waterproof dial gauge is characterized in that the pressure receiving part has a pressure receiving area capable of increasing internal pressure when receiving water pressure in appropriate deep water.