JPS622673Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is based on the outside air side of a ventilation pipe provided in a waterproof switch for automobiles etc. to allow only outside air to pass freely, or a terminal pipe inserted and connected to a ventilation hose connected to the ventilation pipe. This relates to a waterproof filter in which an open hole that communicates with the end pipe is covered with a sheet that has a water-repellent surface, does not allow water to pass through, and is breathable in the thickness direction. By inserting and connecting, the ingress of moisture into the sealed interior of the case or outer skin of a waterproof switch, etc. is completely blocked, and the open port of the terminal tube allows air to enter and exit based on changes in ambient temperature, that is, the breathing effect. This is how it was done.

To explain several embodiments of the present invention, reference numeral 1 in FIG. 1 is a metal end tube, and the outer periphery of the insertion base 2 is integrally provided with one or more serrated rings 3 for preventing reverse removal. The tips of the pores 4 are made into open ports 5 communicating with the outside air, and a sheet 6 having a water-repellent surface and breathability in the thickness direction and a ring-shaped rust-proof washer 7 are applied to the open ports 5, The tip of a retaining ring 8 integrally protruding around the opening 5 is bent in the inner circumferential direction and caulked 9, whereby the sheet 6
and the washers 7 are fixed. Reference numeral 10 is a temporary cap that is loosely fitted, and can be removed when the terminal tube 1 is inserted and fixed into the ventilation pipe or ventilation pipe.

In this example, the sheet 6 used was a Gore-Tex film (registered trademark) having a water-repellent surface and breathability in the thickness direction as described above. The film is in the form of a white flexible sheet with a thickness of about 0.3 to 0.5 mm. In the present invention, any other tetrafluoroethylene resin sheet or other sheet having the same water repellency and air permeability as the above may be arbitrarily selected.

In FIG. 2, reference numeral 11 is a synthetic resin end tube, and several serrated rings 13 are integrally provided on the outer periphery of the insertion base 12 to prevent reverse removal, and the tip of the ventilation hole 14 is closed. A window-shaped opening 16 on the outside air side is formed between the connecting bones 15, and a pipe-shaped sheet 17 with a water-repellent surface and breathability in the thickness direction is provided on the outer periphery of the distal tube 11. They are fitted almost tightly, and both ends thereof are tightened by tightening rings 18 to cover each open opening 16.

Figures 4 to 6 show an example of a sealed switch for lighting a lamp indicating the operating shaft angle of a vehicle equipped with a torque converter, and a contact group 23 is provided as shown in Figure 5. A switch case body 21 with an insulator 22 attached,
The main body 21 is provided with a switch cover 24 that is watertightly adhered to the surrounding area, and an operating shaft insertion hole piece 25 provided in the switch case main body 21.
It consists of a contact holder 28 equipped with a movable contact 27 that slides on the top, and a side piece 29 provided with an opening 30 that communicates with the interior space is fixed to the side of this sealed switch, and a ventilation pipe 33 and a side piece 29 are fixed to the side of the sealed switch. The connecting portion of the connected ventilation hose 34 is placed in a resin filling recess 31 provided on the side piece 29, and the resin 32 is filled and fixed, so that the opening of the ventilation pipe 33 faces the mouth portion 30. The end of the ventilation hose 34 may end within the bellows tube 35, or it may further protrude from the bellows tube 35 as shown in FIG.
Insertion base 2, 1 of the distal tube 1, 11 in Figure or Figure 2
Insert and connect 2 as shown in the diagram. terminal tube 1,
11 can also be inserted and connected to the end of the terminal pipe 33. In that case, the serrated rings 3 and 13 are unnecessary, and when connected in place of the ventilation hose 34 according to FIG. 32, it can be fixed watertightly.

FIG. 3 shows an embodiment in which the opening 33a of the end portion 11 protruding from the resin 32 of the ventilation pipe 33 is covered with the sheet 6 shown in FIG. 1, and fixed with a cover cap 36 having a center hole. be.

The present invention has the configuration as exemplified above, and the sheets 6, 17 that cover and fix the openings 5, 16 facing the outside air of the end tubes 1, 11 have a water-repellent surface and have air permeability in the thickness direction. For example, the sheets 6 and 17 are made of polytetrafluoroethylene resin sheets, etc., which have the properties
Even before, the water repellent surface does not allow water droplets to pass inside, and the end pipes 1 and 11 are inserted and connected to wet the inside of the ventilation pipe 33, ventilation hose 34, etc., and the ventilation pipe 33, ventilation To completely shut off moisture from entering the closed chamber to which the hose 34 is connected. In addition, the breathing action of the closed room can be carried out by the ventilation of the sheets 6 and 17 due to the expansion and contraction of the air due to changes in the outside air temperature, etc., and the terminal pipes 1 and 11 are necessary. It can be inserted into the ventilation hose 34 or the ventilation pipe 33 depending on the situation, and has various advantages such as being able to accurately produce a waterproof effect even if the end pipes 1, 11 are installed in a position where they are exposed to water.

[Brief explanation of the drawing]

Figures 1 and 2 are a longitudinal side view showing one embodiment of the present invention, Figure 3 is a longitudinal side view showing another example, and Figure 4 is a side view showing another embodiment of the present invention.
The figure shows a waterproof switch as an example.
(or 11), a side view showing how it is used, FIG. 5 is a sectional view taken along the line A-A in FIG. 4, and FIG.
FIG. 3 is a plan view cut along line B. 1, 11... Endless tube, 2, 12... Insertion base,
4,14...Vent hole, 5,16...Open port, 6,
17...Sheet.

Claims (1)

[Scope of utility model registration request] The open hole communicating with the outside air side of the end pipe inserted into and connected to the ventilation hose or ventilation pipe is covered with a sheet such as a tetrafluoroethylene resin sheet that has a water-repellent surface and is breathable in the thickness direction. Waterproof filter.