DE1665394A1 - Electric switch - Google Patents

Description

• ooo Mi. <kti. "O. November 28, 1967 Dlpl.-Ing. Egon Prince ernib »re« r »tra» $ «i»

Dr. Gertrud Hauier Dlpl.-Ing. Gottfried Ulier

Patent Attorney 1 ft R *? ^ Q A

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T.l.fon: 83 13 10 pMhdMcMconlot MOndMM 117171

THE PLESSEY COMPANY IIMIIED

56 Yicarage Iane

Ilford, Essex / Great Britain Our sign; P 1955

Electric switch

The invention relates to electrical switches.

According to the invention, an electrical snap switch is provided which is designed such that it has a has fixed and a cooperating movable contact, the movable contact of a rigid Arm is held, which is mounted on a switch actuating part örsrbar, which is itself rotatably mounted is that the rigid contact arm against the pivot point of the switch actuating part with the help of a specially shaped leather is pressed so that the switch actuation

009 887/0 4 29 ^part

Rei / Sr.

ORIGINAL INSPECTED

part engages in a control part (for example a push button) »at one point on the side of the contact arm pivot point, which faces away from the pivot point of the switch actuating part and wherein the operating part acts in a direction tangential to the rotation of the switch operating member about its pivot point runs and that the rotary movement of the switch actuating part is an initiating movement of the contact arm in its longitudinal direction, causing dragging between the movable and fixed contacts occurs and then a movement of the movable Contact takes place in a direction transverse to the longitudinal direction, so that a rapid separation of the contacts is achieved is when the fulcrum of the contact arm from one side of the line that is the fulcrum of the actuating part and connects the connection point of the spring to the contact arm, goes to the other side of the line. the The spring is preferably designed as a long resilient wire that is approximately V-shaped.

The switch contacts can be arranged so that they provide a "breaker" or a "toggle effect, wherein the movable contact normally engages a fixed contact, whereby the movable contact on the

firm 009887/0429

fixed contact grinds before he moves away from him according to the rotary movement of the switch actuating part solves when the operating part is approximately tangential to the rotary movement of the operating part against the effect of the Spring is moved. When the contact arm snaps over the middle, the movable contact is aligned so that that it hits against a stop device or the other fixed contact in the case of "Umsehalf" contacts and that the spring is aligned so that when the operating push button or something similar is released Switch returns to its normal state.

_{N is} an A sführungsfonn of a micro switch according to the invention will now be described with reference to the drawings by way of example. Show:

Fig. 1 is a schematic side view of the basic Arrangement of the switch according to the invention and

2 shows a perspective view of a two-pole switch with a common operating push button.

In Fig. 1, the switch shown contains a snap

009887/0429 mechanism

mechanism for operating the switch contacts. The one shown Switch has a "breaker" effect, the movable contact 1 normally being the fixed one Contact 2 touched. The movable contact 1 is held by a rigid arm 3 in a recess 4 of a Switch actuating part 5 is rotatably mounted, which is curved and which at his one end in a recess 6 of a fixed hinge support 7 is rotatably mounted. A wire spring 8, which has the shape of an inverted V, acts on the arm and its one end is connected to the joint support 7 via the recess 6 and the other end to an intermediate point is rotatably connected along the arm 3. The wire spring 8 holds the contact arm 3 with the part 5 in rotary connection. The switch has an operating push button 9 which is slidably mounted so that a part of protrudes through the wall of the switch housing (not shown).

When the switch is operated, the operating push button 9 pressed down so that a projection 10 causes a rotary movement of the part 5 from it in the clockwise direction. Since the movement of the operating push button for actuating the switch is relatively small and tangential to move the end of the arm 5, there is negligible sliding or rubbing between the operating

009887/0429

nngg push button

tion push button 9 and the end of the arm 5 instead.

When the arm 5 moves, the support of the arm 3 moves slightly towards the fixed Eontakt, so that the Arm 3 moves in its longitudinal direction, causing a sliding movement of the movable contact 1 opposite the fixed Eontakt 2 is reached. The wire spring 8 is only slightly more tensioned by this movement; such movement is very small and therefore the force required to operate the push button increases 9 to move, not essential. When the joint support 4 of the arm 3 moves from a position above the line A moved to a position below the line A, this line being the connection point of the spring 8 with the arm 3 and the joint brace is made at point 12, the snaps Arm 3 by the spring to a position in which the contact 1 no longer touches the fixed contact 2 and on a stop 11 strikes. This is the electrical circuit between the joint support 7 and the fixed Contact 2 interrupted. With such a mode of operation of the switch? drd the tension of the spring 8 actually decreased and thereby in reality the pressure required to move the operating pushbutton 9, decreased even further. When the actuation push button is released, the wire spring acts so that it

009887/0429

switches back the snap mechanism and brings the switch to its normal position, which is shown in the drawing. The operating force is applied to the operating push-button 9 and the return force exerted on the operating push-button 9, depend on the distance "d" between the points 6 and 12 from. When these two points coincide (ie

/ one if "d" = O), then there is a flip effect.

Even if "breaker" contacts are used in the exemplary embodiment described are used, it is of course also possible to have other contact effects, for example To achieve "switch-on" and "switchover" effects without that the scope of the invention is left.

From the above description it can be seen that the switch according to the invention not only results in a sliding contact effect and a snap action, but that these properties can be produced in a particularly simple and inexpensive manner, the advantages being negligible Sliding movement between the control push button and the switch operating arm and the avoidance of considerable Result in an increase in the pressure required to depress the control pushbutton.

In Pig. 2 is as a further embodiment a two-

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polier

Pole microswitch shown, which has two switching contacts · The parts of this switch that are similar to those according to Pig. 1 have the same reference numerals. As Bich reveals, the switch has two switching mechanisms 13 and 14, both of which cause their associated contacts to snap into place, with a sliding effect, as has been described with reference to Pig, FIG. In this two-pole switch of the operation push-button 9 has the Porm an inverted Φ-Endstückee, wherein the two parts at the head of this piece (of which only one is shown 15) in the corresponding T _e ile 5 of the two switching mechanisms 13 and 14 engage. The upper fixed contact arms of the two mechanisms, which have a "primary switching" contact effect, are denoted by 16 and 17 and are passed through the base surface 18 of the insulating housing 19 of the switch so that they form terminals 20. The housing has an integral, upright wall 21 connected to it, which isolates the two mechanisms 13 and 14 from one another. Further switch terminals 22 and 23 are formed by extensions of the joint support 7 and the contacts 2 protrude through the base area 18.

Claims 009887/0429

Claims (5)

Patent claims 1.) Electrical snap-action switch, characterized in that it has a first and a cooperating movable contact, the movable contact being held by a rigid arm which is rotatably mounted on a switch actuating part which is itself rotatably mounted that the ntarre contact arm against the pivot DER 8 ^r; halter operating parts by means of a specially shaped spring is pressed, that the Schalterbetätirunfsteil (for example, a push button) engages an operating portion and at a position on the side of Kontaktarradrehpunktes which is abgewaiidt from the fulcrum of the switch operating member that the operating part acts in a direction which is tangential to the rotation of the switch operating part about its pivot point, and that the rotational movement of the switch operating part causes an initiating movement of the contact arm in its longitudinal direction, whereby a dragging between the movable and the fes th contact occurs and then there is a movement of the movable contact in a direction transverse to the longitudinal direction, so that a rapid separation of the contacts is achieved when the pivot point of the contact arm from one side of the line which the pivot point 009887/0429 _des of the actuating part and the connection point of the spring with the contact arm connects to the other Side of the line. 2.) Electrical snap switch according to claim 1, characterized characterized in that the spring is formed by a long resilient wire. 3.) Electrical snap switch according to claim 2, characterized characterized in that the spring is V-shaped. 4.) Electrical snap switch according to claim 3, characterized characterized in that the actuating member is bent and that the ends of the spring on the contact arm and on a joint support are attached to which the actuating part is rotatably mounted. 5.) Two-pole electrical switch with two switches according to claim 1, characterized in that the operating part is common for both switches. 009887/0429 e rst side