SU836696A1 - Push-button switch - Google Patents

Description

(54) BUTTON SWITCH

Claims (2)

The invention relates to an electronic nickname and is intended for switching and switching of electrical circuits. Known pushbutton switches include bottom-spring-loaded rods with cutouts and keys mounted on rods, as well as spring-loaded locking rods with guides and holes in which rods are inserted. Such switches perform dependent latching. niche. A similar locking device is used in well-known switches containing magnetically controlled contacts (MK) mounted on the housing, rods on which the keys and permanent magnets are fixed, and return springs placed between the keys and the housing 2. Due to insufficient reliability fixing devices, these types of switches are generally characterized by a short service life and are complex. The aim of the invention is to simplify the construction and increase the service life of a push-button switch with magnetically controlled contacts. This is achieved by the fact that the push button switch is equipped with a bracket made of ferromagnetic material, hinged to the case under permanent magnets, a stop, limiting springs and another spring mounted so that the bracket is pressed to the stop, which is fixed to the case above the bracket, and the restraining springs installed under the rod, with stiffness. The return of the springs is less, and the stiffness of the bounding springs is greater than the force of attraction of each magnet to the bracket. FIG. 1 shows a pushbutton switch, obpy view; in fig. 2, dasrez A-A in FIG. one; in fig. 3 section bb FIG. 2;. FIG. 4 section bb of fig. 3; in fig. 5 a section of the GGD FIG. four; in fig. 6 - locking device; in fig. 7 A simplified kinematic scheme of the fixing device. The switch consists of case I (fig. 3), cover 2, rods 3, each of which has two fixed magnets 4 and one key 5 each. In addition, each rod is spring-loaded from below by a return spring 6. The rods move in guides made in the form of rectangular notches located on the cover 2 and the base 7 mounted on the housing I. In the openings located on the base 7, the springs 8 are placed. On the housing 1 of the switch hinge there is a bracket 9, made as U-shaped bracket made of ferromagnetic material la The bracket is spring-loaded at the bottom of the spring 10, and its upward movement is limited by a stop 1 1 fixed to the housing 1 .. The crown matte is pivotally fixed to the housing 1 by two screws I2, washers 13 and tongs 14 (Fig. 5). A gasket 5 of a material resistant to abrasion (bronze, fluoroplastic, etc.) is glued to the bottom of one of the two magnets of each key. The stiffness of the return springs 6 should be less, and the stiffness of the limiting springs 8 should be greater than the adhesion force of each magnet (more precisely, the magnet gasket system) with the bracket 9. The magnetically controlled contacts I6 are fixedly mounted on - boards 17 mounted on housing 1, In order to see the shock of the rod on the body 1, at the moment of switching with the key on the key 2, the rubber strip J8 is installed. For the fixing device to work, the second magnet (without a gasket) placed on the other side of the stem is not obstructed (in this case it was inserted to improve the use of the internal volume of the switch). The presence of the gasket 15 is also not necessary for its operation, its application depends on many factors: on the preset service life of the switch, on climatic and mechanical influences, on the strength of the attraction of the permanent magnets and the bracket, on the material and design of the latter, etc. The number of keys can be either more or less than three. FIG. Figure 3 shows a longitudinal section of a switch in which one key is in the working state and the others in the initial position. The arrow indicates the direction of the force when the button is pressed in its initial position. In the locked state, the rod 3 (and with it the parts fixed on it) is kept in the working position after pressing the key 5 and lowering it (stopping pressing it) due to the attraction of the magnet 4 to the ferromagnetic arm 9. At the same time the bracket 9 is upwardly limited by the stop 11, and down by the spring 10. The gasket 15 reduces the attractive force of the magnet and the n-bit is insignificant, since its thickness should be in the order of 0.1-0.3 mm. Between the lower end of the stem 3 and the upper end of the spring 8 at 3YOM there should be a gap of about 0.1-0.5 mm, which eliminates the influence of this spring on the rod 3 and in the working position. When any other key 5 is pressed, the rod 3 goes down until the gasket 15 comes in contact with the bracket 9. With a further press of this key, the gasket 15 starts to press on the bracket 9 and retract the latter down, while the spring 10 expands. In the process of removing the bracket 9 down, the gasket 15, the magnet 4 and the other parts of this key (in working position) move down along with the bracket by the amount of clearance between the spring 8 and the end of the rod 3, i.e. by 0.1-0.5 mm. After that, the lower ends of the rods 3 of both keys are in contact with the upper ends of the springs 8. Further movement of the stem 3 of the fixed key 5 together with the bracket downwards is impossible, because the rigidity of the springs B is chosen greater than the tension force of the magnet 4 to the bracket 9. Subsequently on the other key 5 and when the crown-, matte goes down, its restrictive spring 8 will be compressed, and the spring 8 of the fixed key 5 will remain in its former free state. After the bracket 9 is lowered down by -5 mm (this value depends on the design, the switch and the magnet strength), the magnet A of the fixed key 5 is detached from the bracket 9 and the magnet 4 leaves, the stem 3 and other parts related to this key, the iodine upwards by the action of the return spring 6. Thus, the key 5, which is in a working fixed position, moves from the working one to its original position when a key is pressed. As soon as this transition occurs, pressing the key stops, and after lowering its free end of the bracket goes up and pressed against the stop 11 by the spring 10, and after pressing the key, the key is moved from the initial to the working position, while being held in position The magnet located on this key is attached to the bracket 9. The other keys of this switch work in the same way. The locking device in the described switch performs a coarse dependent lock of the keys. This fixing device has a simpler design, is more technological, and has smaller dimensions, since the permanent magnets perform a dual function in the described device — they hold the rods in the working position and perform the control of the MK. This fixing device has a longer service life and greater reliability, especially in an environment with high dust content, since this device minimizes the number of rubbing surfaces when switching. In this case, when pressing on any key located in the initial position, pressing the bracket 9 and pulling it down, the latter friction against the gasket takes place due to the fact that the bracket has an angular movement and the gasket is linear (Fig. 7) . The value of l j by which these sliding surfaces move relative to each other in the X direction is less than the known ones. In addition to this, the switch has a higher maintainability as compared with well-known ones, because its service life when the fixing device is out of service (if not, complete wear of all or several gaskets 15 can be extended) can be extended with a very simple and technologically advanced way - removing old and gluing new pads. Claims of the invention A push button switch comprising magnetically controlled contacts mounted on the housing, rods on which keys and permanent magnets are fixed, return springs placed between the keys and the housing, characterized in that, in order to increase the service life and simplify the design, it is equipped a ferromagnetic material bracket, an abutment, limiting springs and another spring mounted so that the arm is pressed against the anvil; this arm is hingedly attached to the building Usa under the permanent magnets, the support is fixed on the housing above the bracket, and the limiting springs are installed under the rods, and the return spring springs are less rigid, and the rest springs are more rigid than the attraction force of each magnet to the arm. Sources of information taken into account for the examination 1. Pushbutton switch PK-11, T10.3.bd2.066t09 OSTV4 GO.360.007, 2. Harazov K, I. Switches with magnetically controlled contacts, Energie, 1978, p., 10, bb 6 fin. 2 FigL FIG. 6 R GTL N s rm FIG. Ij . .7