JPS647451B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a key switch that can also be used for switching purposes.

[Conventional technology and its problems]

In order to improve the safety of electrical equipment, the main switch is equipped with a key so that it can only be operated by the person in charge or a worker instructed by the person in charge. When installing an operation panel with various switches etc. on a stationary body such as a wall or the side of the equipment, it does not affect the shape or format much, but
Small-sized devices are desirable for use in crane pendant switches, which have been adopted in recent years, and other movable objects, and dust-proof devices are sometimes required.

Conventionally used key switches are generally cylindrical, and because the key mechanism part and the switch part are directly connected, they have an elongated shape, which makes it difficult to store them in a restricted case such as a pendant switch. Ta. Furthermore, since the wiring is soldered, it is time-consuming and less reliable, and furthermore, it is difficult to make it dustproof due to its structure.

There is also a waterproof and dustproof switch shown in Japanese Utility Model Publication No. 42-1570. The contact area is covered with a switch cover, but a hole is drilled in the center of the switch cover to prevent the switch cover from twisting even when the core rotates, and a bottomed cylindrical waterproof tube is inserted into the hole. A dustproof body is fitted so that the rotation of the core is transmitted to the rollers via this waterproof and dustproof body. For this reason, the rotating force of the core is transmitted to the switch cover between the switch cover and the waterproof and dustproof body to prevent the cover from twisting, so there is a gap between the switch cover and the waterproof and dustproof body. It is not possible to completely cover the contact portion.

The present invention can be easily stored in a limited narrow case such as a small and lightweight pendant switch, completely closes the inside of the case with a cap-shaped bellows, and furthermore uses the same parts for selection.・Provides a waterproof/dustproof key switch that can be assembled as a key switch.

[Means for solving problems]

The key switch is composed of an upper lid that allows the key to be inserted and also houses a rotating body that can also be used for selection depending on how it is assembled, and a housing that has fixed movable contacts, and a cap-shaped bellows between the upper lid and the housing. The outer periphery of the bellows is sandwiched between the top lid and the container housing to close the interior of the container, and a central clamping portion is formed in the center of the bellows and a ring bulge is formed on the outer periphery of the bellows. The central clamping part is clamped between the protrusion of the rotary body that fits inside the top cover and is rotated by a key and the groove formed on the top surface of the gate-shaped movable operating piece that fits inside the device casing. The rotating body and the movable operating piece are rotatable via a bellows, and a movable contact is provided within the movable operating piece under pressure of a spring.

〔Example〕

The present invention will be explained below based on illustrated embodiments.

In the figure, 1 is the main body case of the key switch, and 2 is the upper cover.The main body case 1 and the upper cover 2 constitute the case of the key switch, and are preferably molded from insulating synthetic resin, but may be made of other materials. It is also possible to use screw holes 1a and 2a, which are formed on the outer surfaces of the housing 1 and the top lid 2, and are provided with screw holes 1a and 2a at opposing positions between them, and screws ( (not shown) are screwed together.

A base metal 3 provided with a fixed contact 3a is fixed to the bottom of the housing 1 so as to be inserted from the outside thereof, and the fixed contact 3a protrudes into the housing, and there is no wire connection outside the base metal housing. A wiring screw 3b is provided to fix the tip of the lead wire or a terminal provided on the lead wire with a screw. At least two base metals 3 with fixed contacts are provided, but in the key switch of the present invention, they are provided at four locations as shown in FIG. 6 so that they can also be used for switching (selecting). More specifically, at least two fixed contacts of each base metal are arranged to face each other on a line passing through the center of the housing, and are electrically connected by a movable contact which will be described later.

In the case 1, stoppers 1b, 1b are protrudingly provided opposite to the inner peripheral surface thereof, and a movable operating piece 4 is inserted, and the side surface of the movable operating piece 4 is rotated within 180 degrees by the stopper 1b. It will be regulated to do the following. This movable operating piece 4 has a gate shape as shown in FIG. A spring 6 is interposed between the inner top surface of the piece and the movable contact piece so that it can always be pressed down with a required pressure, and this spring pressure presses the movable contact into contact with the fixed contact. When this movable contact piece is rotated by the rotation of the operation piece, it rotates smoothly and stops reliably at the fixed contact position, and both contacts contact with spring pressure and are movable at positions other than the fixed contact position. A snap ball 7 is provided between the inner bottom surface of the housing and the movable contact piece for floating the movable contact piece so as to separate it from the fixed contact.

Further, a bellows 8 is provided inside the container housing, and its outer peripheral edge is sandwiched between the upper end surface of the container case and the lower end surface of the upper lid to make them integral, and the bellows 8 closes the inside of the container case and between the upper lid. This prevents water, dust, etc. from entering the container. This bellows 8 is made of rubber, synthetic rubber, soft synthetic resin, etc. and is formed into a circular shape, and is inserted into a groove 4a formed in the top surface of the movable operation piece in the center, and is connected to a projection 9a of the rotating body. A central clamping part to be clamped is formed to follow the shape of the top surface of the movable operation piece, and a ring-shaped bulging part 8c is provided between the central clamping part 8a and the outer peripheral clamping part 8b. When the outer peripheral clamping part is fixed and the central clamping part is rotated within a set angle by the rotating body, the rotation angle of the rotating body is determined by the ring-shaped bulge of the bellows. so that it is absorbed in the area. Therefore, the material and wall thickness of the bellows should be determined so as to have elasticity and durability to absorb the amount of rotation even if the central portion is repeatedly rotated.

The rotating body 9 has a shape as shown in FIG. 8, and is housed in the upper lid, and is regulated by the inner circumferential surface of the upper lid so that it can rotate accurately, and a bellows is clamped at the lower part in cooperation with a movable operating piece. A key groove 9b is formed on the top surface of the protrusion 9a. This rotating body has a cylindrical protrusion 9c protruding from the top surface so that it can rotate concentrically, and a hole 2b provided in the center of the top surface of the upper lid.
The key groove is also formed in this cylindrical projection 9c. A hole 2b into which the cylindrical projection of the rotary body is inserted and a keyway 2c connected to the hole are formed on the top surface of the top cover 2, and only the specified key 10 can be inserted into the rotary body through the keyway. is,
Prevents unspecified keys from being inserted.

In the figure, 11 is the case, 12 is the packing, 13
is a mounting bracket for fixing the key switch to a case, etc.

In the key switch constructed as described above, when a predetermined key is inserted into the key groove 2c and rotated, the key is also inserted into the key groove of the rotating body, and this rotating body is rotated. This rotates the movable operating piece integrated with the bellows in between, and connects and disconnects the movable and fixed contacts using the action of the snap ball and spring, turning the power on and off. When this key is inserted, it is in the OFF state, and the key can be inserted and removed freely.

Also, when this is used as a select switch, the assembly is slightly different from when used as a key switch.
That is, in the case of a key switch, the rotating body is assembled into the top cover so that the keyway of the top cover and the keyway of the rotating body match within the rotation angle of the movable operating piece regulated by the stopper, but in the case of a select switch. , compared this rotating body to one for a key switch.
Assemble it by rotating it 180 degrees and inserting the key into the keyway of the rotating body. As a result, even if the key is rotated, the movable operating piece will only rotate a maximum of 180 degrees, so the keyway on the top cover and the keyway on the rotating body will not match, so the key will not come out. The switch ON1a and the switch ON1b are selectively switched between the switch ON1a and the switch ON1b.An explanation of the key switch and select switch is shown in FIG.

〔Effect of the invention〕

According to the present invention, since the bellows is interposed between the switch case and the upper cover, it is possible to make the switch compact and dust-proof.Also, by assembling the rotary body, the same parts can be used as both the key switch and the select switch. It can be assembled, and since it uses a small number of parts, it has the advantage of being easy to assemble and inexpensive, and can also be easily incorporated into a small case such as a pendant switch.

[Brief explanation of the drawing]

Figure 1 is a front view of the complete structure, Figure 2 is a side view, Figure 3 is a plan view, Figure 4 is a bottom view, Figure 5 is a vertical sectional view, Figure 6 is a horizontal sectional view, and Figure 7 is a side view. The figure shows the movable operation piece.
FIG. 8 is an explanatory diagram of the rotating body, FIG. 9 is an explanatory diagram of the bellows, and FIG. 10 is an explanatory diagram of the key switch and the select switch. 1...Case, 2...Top lid, 3...Base metal, 4...
Movable operation piece, 5... Movable contact piece, 6... Spring, 7
... Snap ball, 8 ... Bellows, 9 ... Rotating body, 10 ... Key.

Claims (1)

[Claims] 1. A key switch is composed of a top cover that allows the key to be inserted and also houses a rotating body that can also be used for selection depending on how it is assembled, and a case that fixes the movable contacts. A bellows is arranged, the outer peripheral part of the bellows is sandwiched between the upper lid and the container housing to close the inside of the container, a central clamping part is formed in the center of the bellows, a ring bulging part is formed on the outer periphery, and the bellows is The center clamping part of is fitted into the top cover and is placed between the protrusion of the rotating body which is rotated by a key and the groove formed on the top surface of the gate-shaped movable operating piece which is fitted into the case. The rotary body and the movable operating piece are clamped and made rotatable via a bellows, and a movable contact is provided in the movable operating piece under spring pressure, and the movable contact is opened via the rotating body and the bellows by key operation. A key switch characterized in that a movable operating piece provided therein is rotatably operated.