SU1585841A1 - Switch - Google Patents

Abstract

The invention relates to electrical engineering and can be used for switching electrical circuits. The purpose of the invention is to increase reliability and reduce switching forces. The switch includes a housing 6, a cover 8, fixed contacts 7, a flip movable contact 10, a spring-loaded switching element 13. On the base of the housing there are five reference points, and in each of the positions the flip movable contact 10 rests on three supporting points, two of which fixed contacts. The spring-loaded switching element 13 is made in the form of a rod 14, onto which a sleeve 17 is mounted, the pins 18 of which rest in prismatic recesses 9 in the side walls of the lid under the action of a compression spring 19. The spring covers the rod 14 and rests at one end on the sleeve 17, and the lower protrusion of the rod 14. 3 Il.

Description

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The invention relates to electrical engineering and can be used in telephone, television, radio relay devices.

The purpose of the invention is to increase reliability and reduce switching forces.

1 shows an axial section of the switch in the initial position; figure 2 - section aa in figure 1; on fig.Z - switching element in disassembled form.

The switch contains anchor points 1-5 in the housing 6, a number of which, depending on the mode of operation, are combined with fixed contacts 7, a cover 8 with prismatic recesses 9 in its side walls, a flip movable contact 10 with side slots 11 interacting with conical the protrusions 12 of the housing 6. The switching element 13 has a rod 14 with a flange 15 from one end and a protrusion

16 spherical shape from the second end, sleeve 17 with a conical-cylindrical pin 18, compression spring 19, covering the rod 14 and resting one end on the sleeve with the pin 18, and the other in the lower protrusion of the rod, which represents the embedded metal washer 20 inserted into the grooves 21 on the rod 14. The pusher 22 has a window 23 in which the rod 14 is located, and a compression spring 24 is attached to it, resting on the metal washer 25.

In the initial position of the switch, the pusher 22 under the action of the compression spring 24 supported in the washer 25 is in the leftmost position (Fig. 1), and through the window 23 fixes the position of the switching element 13 in such a way that the spherical protrusion 16 of the rod 14 acts on the reversible movable contact 10 in the zone located between the three reference points 1,2, 3, with strict direction

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the rod 14 is formed using a movable sleeve 17, the conical-cylindrical axles 18 of which are supported in the prismatic recesses 9 of the cover 8. To ensure the full force effect of the rod 14 on the change-over movable contact 10, a guaranteed clearance h between the collar 15 and the end of the sleeve is provided in the design of the switching element 13 17

When a force is applied to the end face, the pusher 22 drives the rod 14 of the switching element 13 through the window 23, while sliding over the movable contact 10 to its middle, the rod 14 compressing the spring 19, sliding into the sleeve 17. Passing the middle of the moving contact 10 , the rod 14 of the switching element 13 is pushed out of the sleeve 17 by the action of the spring 19, and the reversible movable contact 10, which is located relative to the reference point 3, opens with the reference points 1, 2 and closes with the reference points 4, 5. With further advancement push rod 22 all the way up to amp & the rod 14, slipping along the surface of the flip rolling contact 10, approaches the reference points 4 and 5. increasing the pressure on them to a design pressure sufficient to achieve reliable electrical contact. After removing the force action from the end of the pusher 22 under the action of the compressed spring 24, the pusher 22 returns to its original position, translation to the initial position and the switching element 13. Thus, the reversible moving contact 10 performs cyclic swings relative to the reference point 3 and every time the initial or switched position rests on three reference points (in the initial position - on the reference points 1, 2, 3; in the switched position - on 3. 4, 5. By placing fixed contacts at certain reference points, it is possible to provide with a minimum All kinds of switch operation modes are required at cost. To ensure switching mode of high-current to low-current circuits and vice versa or мы-мы closure mode of operation, fixed contacts are located at anchor points 1-5. contacts from points 4 and 5 - the closing circuit.

It is known that a plane is uniquely determined by three points (one and only one plane can be drawn through three points), therefore, in the proposed switch, the position of the flip movable contact is always unique, which ensures reliable operation of the switch. To prevent longitudinal and lateral displacements of the movable moving contact 10 on the housing 6, there are two lugs 12, and at the flip movable contact 10 there are two lateral grooves 11. The operation of the switching element 13 reduces to ensuring constant and effective pressure in one particular direction. on reversible movable contact 10. This pressure provides a compression spring 19, which, due to the absence of any lateral force, due to the movably located on the rod 14 of the sleeve 15 and 17 with trunnions, creates a force strictly along the axis of the rod 14 and passes through the axis of swing of the switching element 13 formed by conical-cylindrical pins 18 and prismatic depressions 9 in the lateral walls of the cover 8, since the force vector of the switching element 13 is always directed from one point (middle of the axis of the switching bridge element), then the rotation of such a vector is carried out with minimal torques, which allows the switching forces to be reduced as much as possible.

In this device, all the contacts are not electrically connected, but any required connection can be made using the sealed conductors. For example, when implementing a high-current circuit switching mode to a low-current circuit and back soldering the conductor (or connecting via 35 printed circuit board conductor) to contacts 7 at anchor points 1 and 4, a common contact is obtained, but because the contact is at anchor point 1 has a smaller oxide film located in the low-current circuit, and the contact at the reference point 4 has a large oxide film that is in the high-current circuit, this allows switching from one circuit to another reliably. Contacts are usually made of precious materials, so it is important, in accordance with the required operation mode of the circuit switching, to apply the optimal number of contacts. In the proposed switch, contacts that determine all known single switching modes with the minimum possible number of contacts are selected at the site of the reference points, while the reliability and switching force remain unchanged in all switching variants. At the same time with high reliability of work and low effort when switching, the switch provides good maintainability which is achieved due to the possibility of performing routine cleaning of contacts

by opening the lid 8. releasing bushing 17c with trunnions, and thus ensuring simple removal of the switching element 13, the pusher 22 and the movable change-over contact 10. When the lid 8 is opened, the bushing 17 with axles 18 is released from the prismatic recesses 9 —Guns along the rod 14 and rests in the flange 15, preserving the integrity of the switching element 13. This ensures the convenience of the subsequent assembly. Small switching forces in all switch operation modes with the same increased reliability and convenient accessibility to contacts for routine cleaning, as well as ease of disassembly and assembly without dismounting the switch allow it to be used not only in lever mechanisms for telephone equipment, but also in television and radio relay devices .

Claims (1)

Invention Formula A switch comprising a housing on the basis of which three points are located 2S depending on the mode of operation of fixed contacts, a movable contact, one of the support points of which is located in its center, a spring-loaded switching element located in the window of the pusher installed in the housing with the possibility of reciprocating movement, and a lid, characterized in that, in order to increase operational reliability and reduce switching forces, it is equipped with two additional support points, all the support points being located on & so that each of the fixings The tilting movable contact has three points of support, two of which can be fixed contacts, prismatic recesses are made in the side walls of the lid, the spring-loaded switching element is designed as a rod, on which a compression spring is worn abutting one end into the protrusion of the rod, and to others, to a sleeve disposed on the rod with trunnions abutting on prismatic recesses of the buckle. Aa