JPH0733323Y2 - selector switch - Google Patents

Description

[Detailed Description of the Invention] <Industrial field of application> The present invention relates to a selector switch, and more specifically, to seal ingress of water, dust, and the like into a housing containing an operating portion, a contact portion, and the like. The present invention relates to a selector switch having a seal structure.

<Prior Art> Conventionally, as a seal structure of a selector switch, as shown in FIG. 3, for example, a concave groove is formed in a fitting portion of an operating shaft 31 with a housing 34, and an O ring 35 or the like is formed in the concave groove. There is a structure that seals the inside and the outside of the housing 34 by fitting the packing.

<Problems to be Solved by the Invention> By the way, according to the above-described seal structure, when the O-ring 35 swells with oil or the like and expands in the radial direction, the O-ring 35 moves to the inner peripheral surface of the housing 34. The pressing force of becomes stronger. Therefore, the rotational resistance of the operating shaft 31 increases, and the operating shaft 31
There was a problem that 31 became difficult to rotate. Further, when used outdoors, sand, dust, and the like may become clogged between the operation handle 41 and the housing 34, and in this case as well, the operation shaft 31 may be difficult to rotate.

<Means for Solving the Problems> The present invention has been made to solve the above-mentioned various problems all at once, and the configuration thereof will be described with reference to FIG. 1 corresponding to the embodiment. A circular shelf 1a projecting in the circumferential direction is integrally formed on the outer circumference of the operation shaft 1 which is rotated by the operation handle 11. Further, a flange portion 41 that abuts the front surface of the panel P to which the selector switch is attached is integrally formed in front of the housing 4 that houses the operation shaft 1, the operation portion 2, and the contact portion 3, and the flange portion 41 has an outer periphery on the outer periphery thereof. A rim portion 41b that fits with the outer circumference of the circular shelf 1a of the operation shaft and projects forward from the circular shelf 1a is integrally formed. Then, a mounting portion 5a which is formed of an elastic body such as rubber and surrounds the outer peripheral edge of the flange portion 41 of the housing and the front and rear edges thereof, and a front end extending from the mounting portion 5a to the operation handle 11
A packing 5 having a cover 5b that abuts the outer peripheral edge of the mounting part 5a, and a sealing part 5c that branches inward from the front of the mounting part 5a and whose tip elastically presses the front surface of the circular shelf 1a of the operating shaft. The feature is that it is provided.

<Operation> The inside of the housing 4 is sealed from the outside by the sealing portion 5c of the packing elastically pressed against the front surface of the circular shelf 1a, so that water, oil and the like can be prevented from entering the inside of the housing 1. Here, even if the sealing portion 5c of the packing swells with oil or the like and has a large diameter, the tip of the sealing portion 5c can escape along the front surface of the circular shelf 1a, so the tip of the sealing portion 5c. The pressing force on the circular shelf 1a hardly changes, and the rotational resistance of the operating shaft 1 does not increase.

Further, by bringing the tip of the cover 5b of the packing into contact with the operation handle 11, it is possible to prevent dust and sand from entering between the operation handle 11 and the housing 4, and the packing is made of an elastic material. Therefore, sand or the like does not enter between the tip of the cover 5b and the operation handle 11.

Further, by enclosing the rear edge of the flange portion 41 with the packing 5, the gap between the rear surface of the flange portion 41 and the panel P can be sealed, and water, oil, etc. can be introduced from the rear surface of the flange portion 41 into the housing 4. Can be prevented from entering.

<Embodiment> FIG. 1 is a longitudinal sectional view showing the structure of an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view showing the structure of a packing 5 of the embodiment.

Inside the housing 4, an operation portion 2 including an operation cam 2a, an operation plate 2b, and the like, and a contact portion 3 are arranged.

A rear end of the operation shaft 1 having an operation handle 11 fixed to the front end is fixed to the operation cam 2a. By rotating the operation cam 2a by the operation shaft 1, the operation plate 2b moves in the axial direction, The operation plate 2b presses the tip of the contactor 3a of the contact portion 3 to open and close the contact.

Now, at the front end of the housing 4, a flange portion 41 that abuts on the front surface of the panel P to which the entire switch is attached.
Are integrally formed. A male screw 4a for mounting is formed on the outer circumference of the housing 4.

The flange 41 has a circular shelf formed on the outer periphery of the operation shaft 1.
A rim portion 41b that is fitted to the outer periphery of the la 1a and projects further forward than the circular shelf 1a is integrally formed. Further, a donut-shaped groove portion 41c is formed on the rear surface of the flange portion 41.

The packing 5 shown in FIG. 2 is attached to the flange portion 41. The packing 5 is formed of an elastic material such as rubber, and has a mounting portion 5a that abuts on the outer peripheral edge 41a of the flange 41, the tip of the rim portion 41b and the groove portion 41c, respectively. A cover 5b that abuts the outer peripheral edge of the mounting part 5a, and a sealing part 5c that branches inward from the front of the mounting part 5a and whose tip elastically presses the front surface of the circular shelf 1a of the operating shaft. The tip of the sealing portion 5c is formed in an O-ring shape, and the thickness of the portion where the mounting portion 5a abuts the groove portion 41c of the flange is larger than the depth of the groove 41c. .

The product of the present invention having the above structure is fixed to the panel P by inserting it into the opening of the panel P and then tightening the lock nut 6 from the rear surface of the panel P.

<Effect of the Invention> According to the present invention, a mounting portion formed of an elastic body such as rubber and surrounding the outer peripheral edge of the flange portion of the housing and the front and rear edges thereof, and a cover whose tip abuts the outer peripheral edge of the operation handle, In addition, since the packing that consists of the sealing part that elastically presses the front surface of the circular shelf with the tip formed on the operation handle is provided, the cover of this packing provides a large amount of dust or sand between the operation handle and the flange part of the housing. Can be prevented, and sand or the like will not be caught between the cover tip and the operation handle. In addition, the sealing portion can prevent water, oil, etc. from entering the inside of the housing, and even if the sealing portion swells with oil, etc., the rotational resistance of the operating shaft does not increase, and the operating shaft does not increase. Always rotates smoothly. Further, since the packing extends to the rear edge of the flange portion, it is possible to prevent water or oil layer from entering the inside of the housing from the mounting surface of the flange portion to the panel.

As a result of achieving the above sealing effect, it is possible to realize a completely dustproof / waterproof type selector switch that can be applied to, for example, machines for outdoor construction.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing the structure of an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view showing the structure of a packing 5 of the embodiment. FIG. 3 is a longitudinal sectional view of a main part showing a conventional seal structure of a select switch. 1 …… Operation axis 1a …… Circular shelf 11 …… Operation handle 2 …… Operation part 3 …… Contact part 4 …… Housing 41 …… Flange part 41a …… Flange outer surface 41b …… Rim part 41c …… Groove 5 …… Packing 5a …… Mounting part 5b …… Cover 5c …… Sealing part P …… Plate

Claims (1)

[Scope of utility model registration request] 1. A circular shelf projecting in the circumferential direction is integrally formed on the outer periphery of an operating shaft that is rotated by an operating handle, and the selector switch is provided in front of a housing that houses the operating shaft, the operating portion and the contact portion. A flange portion that comes into contact with the front surface of the panel to be attached is integrally formed, the outer periphery of the flange portion is fitted with the outer periphery of the circular shelf, and a rim portion that projects forward from the circular shelf is integrally formed, A mounting portion which is made of an elastic body such as rubber and surrounds the outer peripheral edge of the flange portion and the front and rear edges thereof, a cover which extends forward from the mounting portion and whose front end contacts the outer peripheral edge of the operating handle, and the front portion of the mounting portion. Selector switch, characterized in that it has a packing having a sealing portion that branches inwardly from the inside and has its tip elastically pressing the front surface of the circular shelf.