JPH0239313Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention swings using a receiving piece provided in the housing as a fulcrum, contacts a fixed contact piece for opening/closing a switch, and has a central part in the longitudinal direction. This invention relates to an improvement in a device for preventing a movable switch contact piece from falling off, which has upwardly concave half-moon-shaped ears extending from both sides.

[Conventional technology]

Conventionally, as this type of fall prevention device,
-6980 and Utility Model No. 57-4751 have been proposed.

[The problem that the idea attempts to solve]

In the former among those described in the prior art,
The movable contact piece is pressed from above by a knock bar that is biased by a spring, and its upward movement (escape) is mainly restricted by this knock bar, so it is protected against excessive impact. When the contact bar and the movable contact piece are biased by the spring, the contact bar and the movable contact piece may bounce, and in that case, there is a problem in that the arc flies and the contact part is damaged. In addition, it is necessary to attach the auxiliary receiving piece made of an elastic plate together with the seesaw terminal receiving piece, but since the auxiliary receiving piece has a bent part, the auxiliary receiving plate becomes entangled with each other during the switch assembly process, making it difficult to work. The problem was that it was extremely bad.

In addition, in the latter case, although the movable contact piece is supported by the common terminal, which is a support base, so as not to fall off, a movable contact piece is formed on the opposing inner walls of the housing in order to allow the movable contact piece to swing. The legs of the movable contact piece are loosely fitted into the vertical grooves, and the elasticity of these legs supports the movable contact piece by sandwiching both edges of the common terminal to prevent it from falling off the support base. . Therefore, when a force in the direction of the vertical groove is applied to the movable contact piece due to an impact, the movable contact piece is guided by the vertical groove and bounces, causing chattering on the support base and causing the arc to fly. There were problems in that the contact portions were damaged and the contact resistance increased. When assembling, compress the legs of the elastic movable contact piece, insert it into the vertical groove from above the housing and press down, and then engage this leg with the recessed engagement part of the common terminal. There was a problem in that it had to be assembled at the same time, making the assembly work cumbersome.

Therefore, the purpose of the present invention is that since the movable contact piece is constantly pressed from below and above, it is possible to reliably prevent the movable contact piece from falling off, and to ensure that the receiving piece and the movable contact piece are always electrically connected. To provide a falling-off prevention device for a switch movable contact piece, which prevents the arc from flying when placed in a conductive state and ensures good contact between the receiving piece and the movable contact piece.

Another object of the present invention is to provide a device for preventing a switch movable contact piece from falling off, which is easy to handle and has good workability when assembling a switch.

[Means to solve the problem]

The present invention swings using a receiving piece provided in the housing as a fulcrum, and also has semicircular ears that are concave upward and extend from both sides of the longitudinal center portion, and which come in contact with a fixed contact piece for opening and closing the switch. In a falling-off prevention device for a movable contact piece, a regulating member is provided above the movable contact piece to restrict upward movement of the movable contact piece when the movable contact piece swings, and this regulating member It is characterized by comprising a frame portion that fits into the housing, and a protrusion protruding from the frame portion at a position opposite to each of the ears, and the ear piece and the protrusion are brought into contact with each other. This is a device to prevent the switch movable contact piece from falling off.

In the embodiment, an example is shown in which the movable contact piece fall prevention device according to the present invention is applied to a toggle switch, but it goes without saying that it can be applied to any push button switch.

〔Example〕

The present invention will be described below along with embodiments shown in the accompanying drawings.

Fig. 1 is a central sectional view of a switch constructed by applying an embodiment of the present invention, Fig. 2 is an exploded perspective view of the main components thereof, and Fig. 3 is a plan view showing the lower half of the switch. be. In these figures, reference numeral 1 indicates a housing with an open end surface 1a, and a pair of left and right fixed contact pieces 13, 14 for opening and closing the switch are integrally formed with contact terminals 11, 12 at the bottom of the housing 1. are arranged, and fixed contact pieces 13, 14 are provided at the center of the fixed contact pieces 13, 14.
A receiving piece 16 that is slightly higher than the height of the common terminal 14 and integrally formed with the common terminal 15 is disposed.

Further, a movable contact piece 17 is placed on the receiving piece 16, which swings around the receiving piece 16 as a fulcrum and selectively contacts the fixed contact pieces 13 and 14 for opening and closing the switch. Ru. The movable contact piece 17 has a converter 38 (to be described later) sliding on the upper center surface of the movable contact piece 17, which will be described later. ing. These lug pieces 18, 19 are in a state in which concave surfaces 18a, 19a are in sliding contact with protrusions 27, 28 of a regulating member 25, which will be described later, when the movable contact piece 17 swings.
It is constantly pressed from above with an appropriate force. The centers of the concave surfaces 18a, 19a of the ear pieces 18, 19 and the central upper surface of the movable contact piece 17 on which the converter 38 slides are formed on substantially the same plane, so that the movable contact piece 17 can swing smoothly. We guarantee that. Furthermore, the ear pieces 18 and 19 are connected to a pair of left and right upright portions 23, 23 and 24, 24 formed on the front and rear inner walls of the housing 1.
Left and right movement is blocked by the

On the other hand, above the movable contact piece 17, there is a frame part 26 formed of an elastic body and fitted into the housing 1, and the frame part 26 is opposite to each of the ears 18, 19. the ear pieces 18,
A regulating member 25 is provided which has a pair of protrusions 27 and 28 protruding from the concave surfaces 18a and 19a. This regulating member 25 is press-fitted into the housing.

Furthermore, the frame portion 26 of the regulating member 25 has leg pieces 29 and 30 hanging down in a direction perpendicular to the longitudinal direction thereof.
The bottom portions of the leg pieces 29, 30 are in contact with the bottom inner wall of the housing.

Now, a cover member 32 is attached to the open end surface 1a of the housing 1. This cover member 32 consists of a cover 33 whose lower end is caulked and attached to the housing 1, and a sleeve 34 whose base end is fixed to a round hole bored in the center of the upper surface of the cover 33. . Inside the sleeve 34 is a movable handle 35 with one end protruding outward.
The other end is housed, and a bulge 35A is formed at a position offset from the center of the movable handle 35, which engages with a receiving part formed on the inner wall of the sleeve 34 and becomes the center of tilting of the movable handle 35. ing. However, the enlarged portion 35A of the lever prevents the movable handle 35 from escaping upward. Further, the movable handle 35 has a hollowed out portion 35B formed in its longitudinal direction, and a pin 37 is placed in a slidable state by a compression coil spring 36 inserted into the hollowed out portion 35B. A converter 38 attached to the tip of the movable contact piece 17 is indirectly biased by the compression coil spring 36 and slides on the movable contact piece 17. In order to guide the left and right movement of the movable handle 35, a long hole that is long in the left and right direction is provided on the top surface of the cover 33.

When the movable handle 35 is tilted to the left from the state shown in FIG. During this switching, the ears 18 and 19 of the movable contact piece 17 rotate while slidingly contacting the protrusions 27 and 28 of the regulating member 25.

FIGS. 4 and 5 show a modification of the device for preventing the switch movable contact piece from falling off according to the present invention. Among these, the one shown in FIG. 4 is provided with a pair of protrusions 77, 78 at the lower front and rear center of the frame portion 76 of the regulating member 75, and a pair of protrusions 77, 78 are provided above and connected to the left and right leg pieces 79, 80. a side wall 8 whose upper end abuts the top surface of the inner wall of the cover;
1,82 was formed. Fig. 5 shows a two-circuit type used in a two-pole switch. In this embodiment, the frame portion 86 of the regulating member 85 has four
In addition to providing four protrusions 87, 88, 89, and 90, four leg pieces 9 are provided below the left and right sides of the frame portion 86.
The points forming 1, 92, 93, 94 are the first and second points.
Different embodiments. Further, by attaching the central plane portion 95 of the frame portion 86 to the central partition wall of the housing, the regulating member 85 can be easily attached to the housing.

In addition, when attaching the regulating member to the housing, a hole or a notch is provided in the leg of the regulating member, and the hole or notch is engaged with the inner wall of the housing corresponding to the hole or notch. Of course, protrusions or protrusions may be formed.

[Effect of idea]

Since the present invention is configured as described above, it produces the following effects.

A regulating member for regulating the upward movement of the movable contact piece is also provided above the movable contact piece, and this regulating member includes a frame portion that fits into the housing and a protrusion that comes into contact with the ear piece of the movable contact piece. Therefore, the movable contact piece is supported by the receiving piece from below and is constantly pressed from above by the regulating member, thereby reliably preventing the movable contact piece from falling off. In addition, the movable contact piece does not bounce even when the switch is changed or due to vibration.
The receiving piece and the movable contact piece are always electrically connected.
Therefore, the arc will not fly off even if it receives an excessive impact, so it is possible to prevent the receiving piece and the movable contact piece from being damaged.

In addition, since the regulating member is formed in a relatively simple shape, there is an advantage that it does not get tangled, the parts are easy to handle, and the workability when assembling the switch is good.

[Brief explanation of drawings]

FIG. 1 is a central sectional view of a switch constructed by applying an embodiment of the present invention, FIG. 2 is an exploded perspective view of the main components thereof, and FIG. 3 is a plan view showing the lower half of the switch. FIGS. 4 and 5 are perspective views showing modified examples of the regulating member.

Claims (1)

[Scope of utility model registration request] A movable contact piece that swings using a receiving piece provided in the housing as a fulcrum, contacts a fixed contact piece for opening and closing the switch, and has upwardly concave half-moon-shaped ears extending from both sides of the longitudinal center portion. In the drop-off prevention device, a regulating member is provided above the movable contact piece to restrict upward movement of the movable contact piece when the movable contact piece swings, and the regulating member is fitted into the housing. A movable switch comprising a frame portion that fits together, and a protrusion protruding from the frame portion at a position opposite to each of the ears, the ear pieces and the projections being brought into contact with each other. A device to prevent the contact piece from falling off.