SU1246157A1 - Microswitch - Google Patents

Description

The invention relates to electrical switches used in automatic control systems for electric drives of hoisting-and-carrying machines, machine tools and other industrial equipment, and more precisely to microswitches.

A microswitch is known, which consists of a base, two pairs of fixed contacts, attached to the base, movable contacts selectively in contact with fixed contacts, a drive element for switching moving contacts and a flat spring symmetrically located relative to the axis of the drive element and connected to the latter to interact with it, moving contacts directly attached to the spring in its middle part.

The well-known M1-1Getting switch is device-wide and has a small depth dimension defined by the width of the flat spring. The contact pressure in the known switch changes from the nominal value to zero when the actuator moves to the tripping position, which reduces the safety of the switch.

A microswitch is also known, which contains a base, non-moving contacts fixed on the base, movable contacts, a drive element and a node for switching movable contacts, which consists of two switching nodes symmetrically located relative to the axis of the driving element, each switching node containing a lever, a spring , the movement stops for each switching unit, fixedly mounted on the base, the lever and the spring of each switching unit are connected by one external ends to another The other ends of the lever and spring are the internal ends of the nodes; one internal ends of the switching nodes are connected to the drive element, and the other internal ends of the corner switch nodes are connected to each other. fixed at these ends, while the inner ends of the switching nodes carrying the movable contacts are connected to each other,

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The known microswitch is simple in design, the contact pressure in it when the drive element moves to the actuation position remains constant. In the known microswitch, the moving contacts are located in the movement zone of the switching means of the moving contacts. At high current loads and high switching frequency in this microswitch, the switching means may be subjected to the action of an arc that occurs during switching, which may cause the microswitch to fail.

The aim of the invention is to improve the reliability of the microswitch.

This goal is achieved by the fact that in the microswitch containing the fixed contacts, the drive element, the switching unit of the moving contacts ,. including an elastic element and associated with the drive element, and motion stops of the switching unit, in the elastic element C-shaped slots and petals are made, while said C-shaped slots are made symmetrically with respect to the axis of the drive element so that their branches face the axis the drive element, and the petals carry movable contacts and, together with the middle part of the elastic element, form a U-shaped section curved along its length with U-shaped ends.

Such a design of the microswitch allows simultaneously to provide constant contact pressure when the drive element moves and placing the movable contacts outside the working range of the means of switching the movable contacts, which, respectively, with a simple microswitch device allows increasing its reliability.

Fig. 1 shows the first embodiment of the microswitch in the initial position of the moving contacts; FIG. 2 shows the details of the microswitch of FIG. 1, axonometrics; FIG. on fkg. 3 - microswitch of FIG. 1 in the switched position of mobile 1-contact; FIG. 4 shows the second embodiment of the microswitch in the initial position of the moving contacts in FIG. 5; details of the micro switch 3 1246.

key on fig.Z, axonometric; figure 6 is a microswitch according to Fig, 4 in the switched position of the moving contacts.

The microswitch (figs 1-3) s holds the base 1, the fixed contacts 2 and 3 fixed on the base 1, the movable contacts 4, the drive element 5 and the means for switching the moving contacts, which 10 consists of two switching nodes symmetrically arranged relative to the axis of the drive element, each switching unit fixedly mounted on the base 1.15

The lever 6 and the spring 7 of each switch node with one external ends 8 and 9 are connected to each other and interposed between the limit stops 10 of movement, the other ends 11 and 12 of the levers 6 and 7 are the internal ends of the nodes. One inner ends 11 of the switching nodes are connected to the drive element 5, and the other internal ends of the 12 switching nodes are connected to each other to transfer the moving contacts 4, while the internal ends of the 12 switching nodes are connected to each other, common to the two nodes The resilient element, and the internal endings of the 11 nodes are also connected to each other, the elastic element is also formed. In the middle part of the elastic part, on which the movable contacts 4 are fixed, there are symmetrical C-shaped slits 13, the branches of which are facing the axis of the drive element 5, the slits 13. form petals 14, on the bent ends of which 15 are movable contacts. The tongues 14 together with the middle part 13 of the elastic element form a U-shaped section bent along its length with bent ends 15, in the zone of which they are located in one of the end

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the positions of the drive element 5 (FIG. 3), the ends 11 of the switching nodes connected to it.

The drive element 5, consisting of a button 16 and plate 17, is compressed by a spring 18,

The principle of the microswitch is as follows: when an external force acts on the actuating member 5, it is displaced, while the ends 1I of the switching nodes connected to the actuating member 5, are also displaced

The prc intersection of these ends 11 conditional lines through the connecting points of the outer ends 8 and 9 with each other and the connecting points of the petals 14 with the internal ends of 12 switching nodes (lines GG and I-I-), the switching contacts move.

When eliminating the external force from the drive element 5, all moving parts return to their initial position under the action of the spring 1 8,

As can be seen from the description, the movable contacts 4 can be placed both on the levers 6 connected to each other (figs 1-3) and on the springs 7 connected to each other (figs 4-6), while the drive element 5 is connected to the springs 7 (Fig, 1-3) or with the levers 6 (Fig, 4-6),

The placement of the ground contacts 4 on the petals 14, located outside the zone of movement of the switching nodes and part of the details of the switching nodes, makes it possible to increase the reliability of the microswitch with a simple constructive implementation.

The microswitch can be used in the form of switching devices - auxiliary contacts, embedded in control posts and limit switches.

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Editor V.Ivanova

FIG. 6

Compiled by N.Kuznetsova Techred N. Bonkalo

Order 4007/45

Circulation 643 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 13035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Proofreader V. But ha

Claims (1)

MICRO-SWITCH containing fixed contacts, movable Fig. 1, but the axis of the drive element so that the branches face the axis of the drive element, and the petals carry movable contacts and form, together with the middle part of the elastic element, a II-shaped section bent along its length with bent ends. SU „„ 1246157