SU752569A1 - Screwless electric terminal - Google Patents

Description

(54) PIN-FREE ELECTRICALLY CLAMP

one

The invention relates to electrical engineering, namely, products for connecting current-carrying conductors and can be used in clamping devices.

A clip is known, which is a housing with spring-loaded contacts in the form of brackets located inside it. In addition, the clamp has a pressure plate, a screw spring, and a locking plate. The ends of the bracket are fixed in the housing with the help of special projections on the housing, the holes at the ends of the bracket and the spacer plate 1.

The disadvantage of this device is the complexity of the design of the individual parts that make up the clip, as well as the lack of structural rigidity and unreliability in operation. In addition, the clamp has an increased electrical hazard when working with it, if for any reason it is under voltage. In such a clamp, when the wire touches the contact when connected, or when the circuit breaks between the contact and the wire, when disconnected, an electrical arc arises and, as a result, the molten metal splash with all the ensuing consequences.

Also known is a screwless electrical clamp, comprising a housing made of an insulating material in the form of a cup, in which a push button and two contacts in the form of brackets are installed along the axis, the legs of one of which are rigidly fixed in the push button, and the legs of the other are placed in the hole x 10 bottoms and have movement stops in two directions, two springs of different stiffness, the more rigid of which rests at one end on the push button and the other on the jumper of the bracket connected to the bottom of the glass, and tact pred15 designated for clamp connected to the network 2.

The known clamp provides electrical safety, since the connection and disconnection of the wire from the clamp is carried out with de-energized contacts, which is achieved as a result of using the microswitch and the rotating bar interacting with it.

However, the known clamp does not have sufficient reliability due to the complexity of the design.

The purpose of the invention is to increase operational reliability.

The goal is achieved by the fact that, in a screwless clamp, a contact designed to connect the clamp to the network is located outside the bottom of the glass and interacts with the bracket, a spring of lesser rigidity is installed in the housing, with one end of it unibing into the bottom of the glass and the other in jumper bracket attached to the button.

FIG. 1 schematically shows a screwless clamp; in fig. 2 is a section A-A in FIG. one; in fig. 3 shows an embodiment of a clip; in fig. 4 is a section BB in FIG. 3; in fig. 5 shows an embodiment of the clamp; in fig. 6 shows a section B-B in FIG. five.

The screwless wire clamp consists of a body 1 made of an insulating material, for example, carbolite, and having the shape of a glass, in the bottom of which slits 2 are made for the passage of the legs 3 of the bracket 4, which is the contact. The difference in the width of the plates of the bracket 4 and the legs 3 form a protrusion 5, which is the limiter of the rim, with which the bracket 4 abuts against the bottom of the housing 1 from the inside as it moves.

The part of the leg 3 of the bracket 4, going out, is bent to the bottom of the body and is installed parallel to it, thus forming a movement limiter in a different direction; Inside bracket 4, in its shape, bracket 6 moves, which is with the second contact of the contact pair of brackets 4 and 6. The brackets are arranged so that their legs are directed in opposite directions, and the side surfaces are mutually perpendicular. On the legs 7 of the bracket b, a button 8 is installed from an insulating roll, such as carbolite, moving in the cup of body 1 and partially extending out. On the bracket 6, a contact spring 9 is located, which at one end rests on the bracket 4, and the other on the button 8, pressing the contact brackets with the inner surfaces of the bridges against each other.

A hole 10 is made in the bracket 6, and a hole 11 for inserting the wire 12 is made in the housing 1. An opening for the wire entry can also be made in the bracket 4, with a corresponding hole in the housing. At the bottom of the housing, there is an outside contact 13 to which the return spring 14 presses the bracket 4 with its legs 3. The distance between the protrusion 5 and the bottom of the housing 1 should be equal to the solution value of the contact pair consisting of an additional contact 13 and the legs 3 of the bracket 4.

The brackets in the screwless clamp can be arranged so that their side surfaces are mutually parallel and the brace 6 moves inside the brace 4 into the slots x 15 (Fig. 3)

Such an arrangement of brackets allows to exclude the hole 10 in the bracket 6, leaving only the hole 11 in the housing 1 for insertion of the wire 12. The cable insertion hole can also be performed simultaneously in the bracket 4, the bracket 6 and the housing 1.

The clamp can be made with various designs of the contacts, one of which is made in the form of a bracket, and the other - half-brackets. This contact design completely eliminates all the holes in the brackets for insertion of the wire and the slot for the relative movement of the brackets (Fig. 5).

Screwless clamp for wires works as follows.

Since the force of the spring 9 exceeds the force of the spring 14, when pressing the button 8, simultaneously with it, as one piece, the bracket 6, the spring 9 and the bracket 4 begin to move, compressing the spring 14 until the protrusions 5 of the bracket 4 touch the bottom of the glass housing 1. This.m. the contact of the contact pair opens, consisting of the additional contact 13 and the legs 3 of the bracket 4. Thus, the clamp is de-energized. After that, the movement of the bracket 4 is stopped, and the button 8 and the bracket 6 continue to move, compressing the spring 9. Between the inner surfaces of the bridges of the brackets 4 and 6, a gap is formed into which a wire 12 is inserted through the opening 11 in the housing 1.

Then the button is released and under the action of the spring 9 makes a reverse movement until the wires 12 are clamped between the brackets 4 and 6, after which the action of this spring on the movement of the button 8 and the bracket B stops. From this moment, the clamp 4, the wire 12, the clamp 6, the spring 9 and the button 8 move to the moment of closing the contact 13 and the legs 3 of the clamp 4, as a whole, under the action of the return spring 14.

Thus, when the button is pressed, the additional contacts are first opened and the clamp is disconnected from the mains, and then the main contact is opened, and when released, the main contacts (clip 4 and b) are closed, and then the additional contacts. This ensures that the wires are clamped and unclamped only when the clamp state is de-energized.

Claims (2)

1. The patent of Germany No. 1116766, cl. 21 On 21/00, 1962. 2. USSR author's certificate for application no. 2553227. 06/30/78. FIG i F "ch / 6 AT Fi25 in-in FI8. five