SU1735930A1 - Push-button switch - Google Patents

Abstract

Usage: electrical engineering and radio equipment for switching electrical circuits. SUMMARY OF THE INVENTION: A push button switch comprises a pusher and a rotor interacting with each other through end teeth to provide two fixed positions. Movable contacts are made on a spring-loaded contact bridge of the cup-shaped form with the bottom. The moving contacts are spherical and offset relative to the longitudinal axis of the bridge. The bottom of the cup-shaped bridge is provided with a bulge, and the rotor has recesses. The interaction of the convexity on the bridge with the recess on the rotor ensures the rolling of a spherical moving contact. The recess of the rotor may have a conical shape. 1 hp f-ly. 5 il. 10 s

Description

The invention relates to electrical engineering, in particular, to a pushbutton switch used as a switch for a desk lamp, as well as for switching electrical circuits of household electrical appliances, such as heating appliances, washing machines, fans, etc. More specifically, the invention relates to a pushbutton switch with on and off by pressing the pusher one by one.

The purpose of the invention is to increase the switching capacity, simplify the design and provide automation of the switch assembly.

FIG. 1 shows the proposed pushbutton switch in the on state (the pusher is released); in fig. 2 - the same, in the disconnected state (the pusher is pressed); in fig. 3 is a pushbutton switch, bottom view according to FIG. 1 with the removal of the lower housing part and the compression spring; in fig. 4 is a side view according to FIG. 1 node consisting of a rotor and a contact group, in the enabled state (on an enlarged scale); in fig. 5 is a side view according to FIG. 2 nodes, consisting of a rotor and a contact group, in the off state (on an enlarged scale).

The push-button switch comprises a housing 1, made of two parts with a transverse connector, a pusher 2 and a rotor 3, equipped with face teeth 4 and 5 facing each other. The rotor 3 has the possibility of VI

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the longitudinal movement under the action of the pusher at the beginning of the stroke and turning at a certain angle around its axis at the end of its stroke, as well as fixing in the extreme positions relative to its longitudinal axis. Two flat fixed contacts 6 with screws for connecting current-carrying wires are rigidly fixed in the housing.

A cup-shaped contact bridge 7, spring-loaded with a compression spring 8, contains a bottom 9, which is affected by the rotor 3 when the contacts are disconnected, and is equipped with a pair of movable spherical contacts 10 that bridge the fixed contacts 6 and are displaced relative to the longitudinal axis of the contact bridge. The latter freely mates with the rotor 3 by means of a convexity 11 at its bottom 9, inserted into the conical recess 12 at the end of the rotor with the possibility of sliding along the surface of the recess.

The push button switch works as follows.

In the initial position (see Figs. 1, 4), when the pusher is released, the compression spring 8 pushes the cup-shaped contact bridge 7 to the upper position, in which a pair of spherical movable contacts 10 bridges fixed contacts 6 with rolls, which are provided by their displacement relative to the longitudinal axis of the cup-shaped contact bridge 7 by the value of I. If a pair of spherical movable contacts 10 touch flat fixed contacts 6, a compression torque 8 is transmitted to the cup-shaped contact bridge 7 by the action of a compression spring 8. t, defined by the product of the spring force on arm I.

The optimum I value for a given switch size is 1.5 mm. When the value of I is exceeded, the contact surfaces and the mass of moving spherical contacts unnecessarily increase, which is not economically feasible, especially when making contacts made of silver. When I is less than the specified value, the roll of the contacts becomes insufficient and the effective separation of the contact surfaces is not ensured when closing and opening and creating a conductive connection.

The cup-shaped contact bridge 7 is deflected at a limited angle counterclockwise with respect to its longitudinal axis (see Fig. 4), since it freely mates with the rotor 3 by means of a bulge 11 at its bottom 9 inserted into a tapered recess 12 at the end of the rotor. The rotor and the pusher freely sit on the cup-shaped contact bridge 7, due to the presence of a guaranteed clearance L between the end support surfaces of the pusher and the body, which exclude

the ability to remove the pusher from the housing.

When the pusher is pressed (see Figs. 2, 5), the known mechanism comprising the pusher 2 and the rotor 3 with inclined interacting teeth 4 and 5 provides for the rotation and fixation of the rotor in the depressed position with the gearing for the projections 13 of the housing. Due to the conical shape of the recess 12 of the rotor, mating with a bulge 11

5 of the cup-shaped contact bridge 7, the latter is deflected clockwise and centered, as a result of which the spherical moving contacts 10 are opened in their middle part in

0 to point a, and the current conducting connection — in the peripheral part at point b. Further movement of the pusher 2 together with the rotor 3 in the longitudinal direction to the second fixed position is provided

5 due to the presence of a gap between the movable and fixed contacts.

When the pusher is pressed again, the rotor 3 is rotated at a certain angle, its disengagement from the protrusions 13 of the housing and returning together with the pusher to the initial position (see Fig. 1.4). Simultaneously to the initial position (see Fig. 1, 4). Simultaneously, the moving contact bridge returns to its original position.

5 7, closure fixed contacts.

During the switching process, uniform wear of the contacts occurs and the reliability of contact increases, since their closing and opening occur in

0 of the middle part of the spherical movable contact at point a, which is subject to erosion due to the formation of an electric arc, and the creation of a conductive connection on its peripheral part at point b,

5, without being subjected to an electric arc, after rolling over a spherical moving contact along a flat fixed contact. When making movable contacts of silver alloy

0 switching capacity is increased to 6-8 A at standard voltages of 110-220 V AC.

Thus, the technical advantage of the proposed push-button switch is to increase its switching capacity by opening, closing and contacting various parts of the spherical moving contacts, as well as to simplify its design due to the free coupling of the rotor and the bowl-shaped contact bridge and using a single spring compression, performing simultaneously the function of the contact and return spring. The absence of the need for strict orientation of the functional parts and their attachment allows automation of the switch assembly process.

Claims (2)

Claim 1. A pushbutton switch comprising a housing, interacting with each other a pusher and a rotor mounted in the housing and equipped with facing teeth facing each other, providing two fixed rotor positions relative to their longitudinal axis, fixed contacts and moving contacts made on a spring-loaded spring compressing a contact bridge having a cup shape with a bottom, which is affected by a rotor, characterized in that, in order to increase the switching capacity, to simplify Design and assembly automation, the movable contacts have a spherical shape and are offset relative to the longitudinal axis of the bridge, the bottom of the cup-shaped contact bridge is provided with a bulge, the bulge is introduced into the recess slidably on the surface of the recess, and a cup-like contact bridge has a limited possibility to deflect with respect to its vertical axis. 2. The switch according to claim 1, in accordance with clause 1 and that the recess has a conical shape. YU Fig 2