JPH0546191Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field to which the invention pertains The present invention relates to a small switch, and particularly to an improved structure of a contact mechanism, that is, a movable contact piece.

BACKGROUND ART A conventional small switch of this type with a sliding contact mechanism has been developed having a structure shown in FIG.

However, in the conventional structure, as shown in Fig. 7, the stopper for the sliding movement of the movable contact piece is the inner surface of the case, and the case may be damaged due to the impact force, heat generated by the movable contact piece, or arc heat. In addition to burnout of the case, electrical failures occurred due to the scattering of metal powder due to the sliding of the movable contact piece. In addition, the thickness of the case had to be increased in order to maintain its strength against impact, which was a hindrance to miniaturization of the switch. Furthermore, from the capacity of the switch,
In order to stabilize the contact, it was necessary to increase the contact pressure due to the one-point contact, which resulted in disadvantages such as heavy operating force and lack of snap action.

Purpose of the invention The present invention was made in order to eliminate the above-mentioned drawbacks inherent in the prior art. Therefore, the purpose of the present invention is to provide a small-sized device that maintains good electrical contact at all times and is operable. The objective is to provide a new small switch that is light and has a good snap action.

In addition, small switches used in industrial equipment are
Since vibrations and shocks can cause serious accidents if the movable contact comes off, safety is required.Therefore, another purpose of the present invention is to develop a compact switch that eliminates these conventional drawbacks. It is about providing.

Structure of the invention In order to achieve the above object, the small switch according to the invention has a receiving piece arranged inside the case with a height slightly higher than the height of the fixed contact piece, and a structure around the receiving piece that is higher than the inner bottom surface of the case. A movable contact piece that forms a raised part and has a plate shape with a protrusion on the bottom surface or a notch on the tip slides on the receiving piece, and when the switching operation of the switch is stopped, the top and side surfaces of the fixed contact piece are in contact with each other. Constructed to touch multiple locations.

Embodiments of the Invention Next, preferred embodiments of the present invention will be specifically described with reference to the drawings.

1 to 3 show an embodiment of the present invention,
Of these, FIG. 1 is a front sectional view, FIG. 2 is an exploded perspective view, and FIG. 3 is a plan view showing the inside with the cover, handle, etc. removed.

1 to 3 showing an embodiment of the present invention, a case 1 having an opening on the top surface
Three rectangular through holes are provided on the inner bottom surface of the board, and a raised part (insulating wall) 2 is formed around the holes to improve the insulation between the terminals, and the fixed contact piece 3 and the contact terminal 3 are
a are integrated and inserted and fixed on the left and right sides of the rectangular through hole, and the receiving piece 4 and the common terminal 4a are integrated and inserted into the central through hole, and are arranged and fixed higher than the left and right fixed contact pieces 3. be done.

A movable contact piece 5 is provided in the center with a through hole 5a and protrusions 5b on the lower surfaces of both sides, and both ends 5c are curled upward, and is placed in the recess 4b of the receiving piece 4. It is guided by a guide wall 6 inside the case to prevent twisting, tilting, etc.

An insulating plate 7 having a substantially rectangular long hole 7a in the center is placed in the opening on the top surface of the case, and a cover 8 is placed on top of the insulating plate 7. The cover 8 has hanging pieces 8 on its front and rear sides.
It is fixed to the case 1 by fitting into the protrusions 1a on the lower front and rear surfaces of the case 1 which correspond to the two recesses 8b at the lower ends of the case 1. An externally threaded sleeve 9 is integrally formed in the center of the upper surface of the cover 8, and a handle 1 is inserted therein.
0 is inserted so that it can be tilted left and right. That is, the handle 10
The intermediate spherical portion (central enlarged portion) 10a is received by the stepped portion 9a on the inner surface of the corresponding sleeve 9, and
A coil spring 11 is inserted into a recess 10b that is deeply recessed upward from the lower end surface of the lower cylindrical portion of the handle 10, and its spring force pushes the handle 10 upward.

The hole 7a at the center of the insulating plate 7 is long from side to side;
Since its width is just enough to accommodate the lower part of the handle 10, the handle 10 is guided by this hole 7a and tilts left and right.

After inserting the coil spring 11 into the recess 10b that is deeply recessed upward from the lower end surface of the lower cylindrical portion of the handle 10, a pin 12 with a stepped portion is inserted, and the tip of the small diameter portion is placed in the center of the movable contact piece 5. It is inserted into the through hole 5a.
The tip of the pin 12 is rounded to facilitate insertion. Although the protrusions 5b on the lower surface of the movable contact piece in the embodiment shown in FIGS. 1 to 3 are formed by cutting and bending in the longitudinal direction, they may be formed by cutting and bending in the width direction.

Since the switch according to the present invention has a mechanism in which some of the movable contact pieces slide and make contact, some of the metal powder is scattered, and the withstand voltage and insulation between the fixed contact piece 3 and the receiving piece 4 are reduced. In order to prevent electrical disturbances caused by deterioration, a rising portion (insulating wall) 2 higher than the inner bottom surface of the case is formed around the fixed contact piece 3 to increase the creepage distance.

Next, to explain the operation, the coil spring 11 inserted from the lower end of the handle 10 pushes the ball portion 10a of the handle upward toward the stepped portion 9a inside the sleeve. Pin 12 inserted into the lower end of handle 10
A through hole 5 whose tip is provided in the center of the movable contact piece 5
When the handle 10 is tilted to the left in the state shown in FIG. 1 in which the movable contact piece 5 is pressed by the stepped portion of the pin 12, the movable contact piece 5 slides to the right and the pin When the lower end of 12 crosses the receiving piece 4,
The movable contact piece 5 tilts to the right and then slides on the fixed contact piece 3 on the right side in FIG. Then, the right protrusion 5b provided on the lower surface of the movable contact piece 5 acts as a stopper and comes into contact with the side surface of the right fixed contact piece 5, whereby the switching operation of the switch is performed and stopped. The same holds true when tilting the handle to the right.

Figures 4a, b, and c show modified embodiments of the movable contact piece, in which figure a shows a pair of parallel projecting pieces 15 bent upward from the center in the width direction of the movable contact piece 15.
a, and a through hole 15 is formed in the center of the protruding piece 15a.
A' is provided, and a converter 14 is mounted on the corresponding shaft part 14a and a hole 14b formed on the upper surface into which the narrow part of the lower step of the pin is inserted.
It is freely tiltable around 4a. Therefore,
It is possible to obtain a switch whose movable contact piece will not come off even if the switch is accidentally dropped or by an external impact. Figure b shows a protrusion 2 by bending the part protruding from the side surface of the movable contact piece 25 downward.
This is a modified example in which 5b is formed. Figure c is a modification that is almost the same as Figure b, but the through hole 35a formed in the center of the movable contact piece 35 is cut and formed, and the way the protrusion 35b is bent is different from Figure b. It's just different.

Figures 5a and 5b show a second variant embodiment of the movable contact piece. The fixed contact pieces 43, 53 have convex tips, and the movable contact pieces 45, 55 have cutout portions 45b, 55 in a U-shape (Figure a) and a V-shape (Figure B).
b, and initially the lower portions 43a, 53 of the fixed contact piece
The front and rear tips of the movable contact pieces 45, 55 contact a,
After that, the movable contact pieces 45 and 55 are slid, and the notch 4
5b and 55b contact the side surface of the fixed contact piece.

FIG. 6 shows a third modified embodiment of the movable contact piece in which the relationship between the concave and convex portions is reversed from that in FIG. 5. Incidentally, an uneven portion may be provided on either or both of the contact portion of the upper surface of the fixed contact piece and the lower surface of the tip of the movable contact piece.

Effects of the invention The invention is constructed and operates as described above, and the following effects can be obtained according to the invention.

Since the lower surface of the movable contact piece has a protrusion, it makes double contact with the side surface of the fixed contact piece in addition to the top surface of the fixed contact piece, making it possible to make stable contact. Since the side surface of the fixed contact piece and the above-mentioned protrusion act as a stopper, the case will not be damaged by impact force, and there will be no scattering of case powder due to heat generated by the movable contact piece, arc heat, etc. , can provide a switch with always good electrical contact. Furthermore, since the inner surface of the case acts as a stopper against the movement of the movable contact piece, there is no need to worry about strength, and the wall thickness of the inner surface of the case can be made thinner, contributing to miniaturization of the switch.

Since the height of the receiving piece is higher than the height of the fixed contact piece, so-called sliding contact and butting contact are used together, so the movable contact piece moves and tilts rapidly.
The advantage of batting contact is the fast opening and closing speed.
In addition to having a good snap action, it also has a self-cleaning effect, which is an advantage of slide contact, so it is possible to provide a small switch with stable contact.

Furthermore, by providing a rising part around the fixed contact piece that is higher than the bottom surface inside the case, the creepage distance is increased, and metal powder on the movable contact piece and fixed contact piece is prevented by arcing or sliding movement of the movable contact piece. It has the effect of preventing damage to insulation or withstand voltage due to scattering.

A configuration in which a pin serving as a switching member is inserted into the through hole of the movable contact piece and surrounds the switching member prevents the movable contact piece from coming off or shifting laterally, and can withstand 3 to 5 times the impact of conventional models that can withstand 100G. There is no problem at all due to the movable contact piece coming off due to a fall impact.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing an embodiment of the switch according to the present invention, FIG. 2 is an exploded perspective view showing an embodiment of the switch according to the present invention, and FIG. 3 is a front sectional view showing an embodiment of the switch according to the present invention. , a plan view with the handle etc. removed; Figures 4a, b, and c are perspective views of essential parts showing a modified embodiment of the present invention; Figures 5a and b show another modified embodiment of the present invention. FIG. 6 is a perspective view showing still another modified embodiment of the present invention, and FIG. 7 is a front sectional view of a conventional switch of this type. 1...Switch case, 2...Insulating wall (rising part), 3, 43, 53, 63... Fixed contact piece, 4
... Receptacle piece, 5, 15 ... Movable contact piece, 25, 35,
45, 55, 65...Movable contact piece, 5a, 25a, 3
5a, 45a, 55a, 65a...through hole, 5
b, 25b, 35b...Protrusion, 6...Guide wall, 7
...Insulating plate, 8...Cover, 9...Sleeve, 10
...Handle, 11...Coil spring, 12...Pin,
14... Converter, 43a, 53a... Lower part of step, 4
3b, 53b...Convex portion, 45b, 55b, 65
b...notch, 63b...recess.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a switch in which a fixed contact piece and a receiving piece are arranged in a case, and the switch is opened and closed by sliding a plate-shaped movable contact piece on the receiving piece, The height of the receiving piece is arranged higher than the height of the contact piece, and the substantially central part of the movable contact piece surrounds and engages with the switching member provided below the handle, and at the same time, the movable contact piece engages with the switching member on both sides of the movable contact piece. A rising portion is provided on both sides of the opposing receiving pieces, and a protrusion or a notch is formed on the lower surface of the movable contact piece, so that when the switching operation of the switch is stopped, the movable contact piece touches the upper surface of the fixed contact piece. A small switch that makes contact with multiple points on the side. (2) The small switch according to claim (1), which is a registered utility model, further characterized in that an insulating wall is provided around the fixed contact piece, and the surrounding surface is formed higher than the inner bottom surface of the case.