JPS6131460Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a waterproofing device for a switch disposed in a panel portion of an electric washing machine or the like.

In general, operation switches used for equipment that uses water, such as electric washing machines, are often exposed to water, and switches for electrical systems are not inconvenient due to electrical insulation. well known.

However, in this type of operating switch, the operating section must be exposed on the surface of the machine body and operations such as rotation or sliding must be performed, so the operating shaft has a waterproof structure using an oil seal or the like. However, this structure requires high machining precision, making it expensive.Also, if the oil seal is placed too closely against the operating shaft to improve the sealing effect, the operating resistance will be large, requiring a large operating force. As a result, there were inconveniences such as a poor feeling when changing the switch.

This invention solves the above-mentioned conventional inconveniences.
Hereinafter, one embodiment will be described with reference to the drawings.
In the figure, a switch 1 is attached to a mounting boss 3 protruding from the back side of a panel 2 with a machine screw 4, and its rotary operation shaft 5 protrudes from an opening 6 of the panel 2 to the front side of the panel 2. This panel 2
A boss 8 of a knob 7 is attached to the more protruding tip of the operating shaft 5. A foamed elastic body 9 such as a sponge is provided on the back side of the knob 7, and a synthetic resin plate 1 made of a polypropylene sheet or the like is further provided.
0 is set. This synthetic resin plate 10 is adapted to come into pressure contact with a cylindrical rib 11 integrally projecting around the opening 6 of the panel 2. That is, the foamed elastic body 9 and the synthetic resin plate 10
are plate-shaped pieces that are polymerized and bonded with double-sided adhesive tape or the like, and then punched out into a donut shape, and their inner diameters are almost the same.

Here, the boss 8 of the knob 7 is formed by increasing the diameter of its base 12 or by providing several small ribs on the base 12 to form a fitting part, and the boss 8 is made of foamed elastic material to which a synthetic resin plate 10 is bonded. When the body 9 is inserted into the boss 8 of the knob 7 in advance, the fitting portion at the base 12 is press-fitted and the foamed elastic body 9 will not come off from the knob 7. When the knob 7 is attached to the operating shaft 5, the rib 11 and the synthetic resin plate 10 come into contact with each other due to their dimensions, and this contact further compresses the foamed elastic body 9. Therefore, the rib 11 and the synthetic resin plate 10
will definitely be in a pressure-welded state. The foamed elastic body 9 is the boss 8
The base 12 is in a press-fitted state, but the tip side is in a loose state, and as the foamed elastic body 9 expands and contracts, the synthetic resin plate 10 abuts against the rib 11 with appropriate pressure.

As described above, according to the present invention, the inside and outside of the panel are watertightly separated, and there is no entry or exit of water or steam, and when the knob is rotated, the synthetic resin plate and the ribs of the panel are separated. Since they are in a moderate pressure contact state, sliding between them is smooth and their lifespan is long.
Furthermore, when the knob is pulled out from the operating shaft when replacing a switch, etc., the foamed elastic body or synthetic resin plate does not fall off from the knob side, and the work can be done efficiently.
In addition, the ribs that the synthetic resin plate comes into contact with are provided integrally with the panel, and the foamed elastic body and synthetic resin plate attached to the knob side have a simple structure and can be obtained at low cost, so they are not practical. Furthermore, even if the operating shaft is slightly eccentric or there are slight variations in the lengthwise dimension,
Since the foamed elastic body absorbs this, it can be manufactured without requiring precise machining accuracy, and has many effects such as ensuring waterproofness.

[Brief explanation of the drawing]

The figure is a sectional view showing an embodiment of a washing machine panel equipped with the waterproof device for switches of the present invention. DESCRIPTION OF SYMBOLS 1... Switch, 2... Panel, 5... Rotating operation shaft, 6... Opening, 7... Knob, 8... Boss, 9... Foamed elastic body, 10... Synthetic resin plate, 1
1...Rib, 12...Root.

Claims (1)

[Scope of utility model registration request] A panel with a switch attached to the back side, an opening provided in the panel so that the tip side of the rotary operation shaft of the switch faces the front side of the panel, and a part provided on the periphery of this opening so as to protrude toward the front of the panel. a knob with a boss attached to the tip end of the operating shaft; a fitting portion provided only at the base of the boss; A waterproof device for a switch, comprising a foamed elastic body to which a resin plate is fixed, and the synthetic resin plate is slidably pressed against the tip of the cylindrical rib via the elasticity of the foamed elastic body.