JP2001014976A - Rotary switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve waterproof performance. SOLUTION: This rotary switch is provided with an electrically insulating case 2 which is opened at the upper face and provided with a fixed contact piece 1 at the inner bottom face, an electrically insulating rotor 5 inserted rotatably in the case 2, provided with a movable contact piece 3 at its lower face so as to come in contact with and to separate from the fixed contact piece 1, and provided with a protruding part 4 at its upper face center part, and an electrically insulating ring-like cover 6 fitted into the inner periphery of the case 2 in the state of its outer periphery being locked to the inner periphery of the case 2. Grease G is applied at least between the lower face of the cover 6 and the outer peripheral upper face of the rotor 5, and the lower edge of a center hole 7 of the cover 6 is pointed to slightly toward the center side, so as to come in pressure contact with the outer periphery of the protruding part 4. It is preferable to apply the grease also between the lower face of the rotor 5 and the inner bottom face of the case 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch suitable for detecting opening and closing of a door lock of an automobile.

[0002]

2. Description of the Related Art This type of switch has a case in which an upper surface is opened and a fixed contact is provided on an inner bottom surface, and a movable contact which is rotatably inserted into the case and is disposed on the lower surface to be in contact with and separate from the fixed contact. A rotor provided with a convex portion at the center of the upper surface, and a ring-shaped cover fitted between the outer periphery of the convex portion and the inner periphery of the case and having an outer edge locked to the inner periphery of the case. Grease has been applied between the lower surface of the cover and the upper surface of the outer periphery of the rotor for the purpose of waterproofing.

[0003]

However, there is a problem to be solved in that grease gradually flows out from a small gap between the outer periphery of the convex portion of the rotor and the center hole of the cover due to the rotation of the rotor, thereby deteriorating the waterproof performance. Should be noted. The present invention has been made in view of such problems to be solved, and has as its object to improve waterproof performance.

[0004]

Means for solving the problems are as described in the claims.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described. However, this is merely an exemplary embodiment adopted based on the present invention, and the present invention will be described based on matters unique to the embodiment. Therefore, the technical scope of the present invention should be determined based on the matters stated in the claims and matters substantially equivalent to the matters.

In the illustrated embodiment, an electrically insulating case 2 having an upper surface opened and a fixed contact piece 1 provided on an inner bottom surface, and the fixed contact piece 1 rotatably inserted into the case 2 and attached to the lower surface. A movable contact piece 3 for contacting and separating is provided, and a projection 4 is provided at the center of the upper surface.
And an electrically insulating ring-shaped cover which is fitted between the outer periphery of the projection 4 and the inner periphery of the case 2 and whose outer edge is locked to the inner periphery of the case 2. 6
Grease G is applied at least between the lower surface of the cover 6 and the upper surface of the outer periphery of the rotor 5, and the lower edge of the center hole 7 of the cover 6 is directed toward the center so as to press against the outer periphery of the protrusion 4. It is a slightly pointed rotary switch. The grease may be applied between the lower surface of the rotor 5 and the inner bottom surface of the case 2.

More specifically, a terminal 8 extending from the fixed contact piece 1 protrudes from one side surface of the case 2, and a shaft 9 protruding from the center of the lower surface of the rotor 5 is inserted into the center of the inner bottom surface of the case 2. Is formed. Movable contact 3
Are small projections (not shown) projected from the lower surface of the rotor 5
Is fixed to the lower surface of the rotor 5 by inserting it into the small hole 11 and caulking. A ring-shaped protruding edge 12 formed on the outer peripheral edge of the cover 6 is press-fitted and locked in a ring-shaped groove 13 formed on the inner periphery of the case 2. A ring-shaped recess 14 is formed on the upper surface near the outer periphery of the rotor 5, and a ring-shaped recess 15 is also formed on the lower surface of the cover 6. The grease G is sealed in a space between the recess 14 and the recess 15. Further, a sharp portion 16 formed slightly below the lower edge of the center hole 7 of the cover 6 toward the center side,
This is apparent from FIG. 1B, which is an enlarged view of the portion A in FIG.

The rotor 5 is rotated by the rotating force applied to the convex portion 4 and the fixed contact piece 1 and the movable contact piece 3 come into contact with and separate from each other in a turning range as shown in FIG. Since the sharp portion 16 formed on the cover 6 made of an elastic synthetic resin presses the outer peripheral surface of the convex portion 4 of the rotor 5 in a line contact in a circumferential manner, the outer periphery of the convex portion 4 and the center hole 7 of the cover 6 are formed. Since the gap between them can be substantially eliminated, the outflow of grease G can be extremely reduced, and a highly waterproof switch can be realized.

[Brief description of the drawings]

FIG. 1A is a half-sectional view showing an embodiment of the present invention, and FIG.

FIG. 2 is a top view of the same.

FIG. 3 is an exploded perspective view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed contact piece 2 Case 3 Movable contact piece 4 Convex part 5 Rotor 6 Cover 7 Center hole 16 Sharp part

Claims (1)

[Claims] 1. A case in which an upper surface is opened and a fixed contact piece is provided on an inner bottom surface, and a movable contact piece rotatably inserted into the case and rotatably connected to and separated from the fixed contact piece on a lower surface is provided. And a ring-shaped cover that is fitted between the outer periphery of the convex portion and the inner periphery of the case and whose outer edge is locked to the inner periphery of the case, at least a lower surface of the cover. Grease is applied between the upper surface of the rotor and the outer peripheral surface of the rotor, and the lower edge of the center hole of the cover is slightly sharpened toward the center so as to press against the outer periphery of the convex portion.