RU2246775C1 - Ignition switch contact device - Google Patents

Abstract

FIELD: electrical and radio engineering.

SUBSTANCE: proposed contact device has insulating base that mounts contact holders with fixed bimetal contacts of ignition circuit, as well as insulating contact disk provided with step-shaped section which is engageable with central rotary pin and is spring-loaded relative to the latter. Mentioned disk carries movable contact in the form of conducting plate. Disk and conducting plate are provided with slots at points in which fixed bimetal contacts occur when their contact with conducting plate is broken.

EFFECT: ability of suppressing electric arc between contacts and their overheat protection.

1 cl, 3 dwg

Description

The invention relates to the field of electrical engineering, in particular to car switches and can be used in car ignition switches.

The ignition switch contact device belongs to the IPC class “Basic elements of electrical equipment”, namely Н 01 Н 21/00.

The famous “Car ignition switch” according to the certificate of the Russian Federation for utility model No. 5286 dated June 4, 1996, published in the bulletin “Utility models, industrial designs” No. 10-1997, containing a contact part including a base of electrical insulation material on which fixed bimetallic contacts are mounted the ignition circuit, as well as a disk of electrical insulation material interacting with the central rotary axis and spring-loaded relative to it, with a movable contact mounted on it, made in the form of a conductive th plate interacting with fixed bimetallic contacts, characterized in that it is equipped with a contact pin fixed on the base, at the free end of which a leaf spring is fixed, the contact end of which interacts with an additional contact section located on the cylindrical surface of the disk and connected to the conductive plate.

The closest in number of similar features to the claimed technical solution is the “Car ignition switch” according to the description of the patent of the Russian Federation for invention No. 2068590 of 03/29/93, published in the bulletin “Inventions” No. 30-1996, containing the essential features of the restrictive part of the claims, the same with the previous analogue, characterized in that it is equipped with an additional plate made of a material with high heat capacity, which is mounted on the disk, while the disk is equipped with a slot made between the tocopr A driving plate and the additional plate. This analogue can be selected as a prototype of the proposed solution.

In the inventive contact device of the ignition switch (hereinafter referred to as the contact device), another method of switching contacts is proposed, which allows for a more complex switching algorithm, as well as the extinction of the electric arc between the contacts and the prevention of their overheating that occur during operation.

The essence of the claimed invention lies in the fact that the contact device contains: a base of electrical insulating material - 4 (Fig. 1), on which fixed bimetallic contacts - 2, located in the contact holder - 6, are mounted, as well as a contact contact with the central rotary axis and spring-loaded relative to it a disk of electrical insulation material - 3 with a movable contact fixed on it, made in the form of a conductive plate - 5, interacting with fixed bimetallic contacts, etc. than the disc is uneven in thickness, namely the disc has a larger thickness portion in the form of "step". When the contact device is operating, the fixed contact - 2 (Fig. 2) slides along the conductive plate and, when the contact holder - 6 hits the “step" of the disk, it leaves the electrical interaction with the plate - 5.

To extinguish the electric arc that occurs when the circuit breaks, in the locations of the bimetallic fixed contacts, grooves 7, 8 are made in the conductive plate and the disk (Fig. 3).

Thus, in the claimed technical solution, the contact switching is carried out by performing a “step” in the rotary disk, the length and location of which determines the required switching algorithm, and the suppression and elimination of overheating and fusion of the insulating material of the disk is performed by making grooves in the conductive plate and disk in places of rupture of electrical contact of the plate with fixed bimetallic contacts.

Drawings explaining the operation of the contact device:

Figure 1 - contact device, assembly drawing: 1 - rotary axis, 2 - bimetallic contact, 3 - contact disk, 4 - base, 5 - conductive plate, 6 - contact holder.

Figure 2: 3 - contact disk with a "step", 2 - bimetallic contact, 5 - conductive plate, 6 - contact holder.

Figure 2 shows the contact disk at the time of finding the output with a bimetallic contact on the "step" and breaking the electrical circuit between them.

Figure 3: 3 - contact disk, top view, 5 - conductive plate, 6 - contact holder, 7 - groove in the conductive plate, 8 - groove in the contact disk.

In Fig. 3, the dashed line shows the bimetallic contacts located on the contact holders, which are on the “step”, and at the moment of breaking the electric circuit are located above the grooves made in the conductive plate and the contact disk.

Information confirming the possibility of implementing a contact device is given from the technology of its manufacture:

1. The manufacture of plastic parts is made from injection molding thermoplastic plastics on injection molding machines of domestic and foreign production;

2. Production of springs - on a spring-coiling machine.

3. The manufacture of metal parts - by stamping followed by flexible;

4. Installation of bimetallic contacts in contact holders - by riveting;

5. Installation of contact holders in a plastic base - caulking method;

6. The assembly of the contact device is as follows:

- the contact disk with the conductive plate is assembled - the disk assembly;

- the base is assembled with contact holders - the base is assembled;

- spring is installed on the drive shaft (rotary axis);

- the drive shaft is inserted into the contact disk assembly;

- a second spring is installed, and the drive shaft is inserted into the base assembly;

- installation of the washer on the shaft end of the drive is performed.

Claims (1)

Contact device of the ignition switch, containing a base of electrical insulation material on which fixed bimetallic contacts of the ignition circuit are mounted, as well as a contact disk of electrical insulation material interacting with the central rotary axis and spring-loaded relative to it, with a movable contact mounted thereon in the form of a conductive plate interacting with the stationary bimetallic contacts, characterized in that a thickened section in the form of a "step" is made on the disk, when ohm on the disc and the conducting plate are made grooves at locations fixed contacts to release them from electrical interaction with a conductive plate.

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