FR2727566A1 - ELECTRICAL AND MECHANICAL CONDEMNATION DEVICE FOR CONTACTORS - Google Patents

Abstract

Electrical and mechanical locking device for contactors, intended to be placed between two contactors. The two input connections A ', B' and one output connection A are located on a side face of the housing 1 while the other output connection B is located on the opposite side face.

Description

ELECTRICAL AND MECHANICAL CONDEMNATION DEVICE FOR

SWITCHES

  The present invention relates to an electrical and mechanical locking device for contactors. A locking device associated with two contactors is used in electric motor drives, providing reversals, or star-delta starts, to prohibit simultaneous closing. The electrical condemnation between two contactors is to open as soon as possible the supply circuit of the coil of the first contactor

  by the action of closing the second contactor and vice-

  versa. However, simultaneous electrical control of the two devices, shocks can act on the elements supporting the contacts, or manual control

  simultaneous occurrence, may inadvertently

  circuit by closing the power blades of the

contactors.

  It is therefore advisable to add to this device a mechanical locking system. The mechanism thus integrated in the system is actuated by the two contactors. The first contactor closed, therefore acts on the mechanism to prohibit the closure of the second

contactor and vice versa.

  Such a system of condemnation both electrical and mechanical, is described in European Patent No. 495 502. This system requires that the input-output terminals of the first contact opening be on the upper face of the locking device and that those of the second are on the opposite side. This principle is particularly troublesome with regard to the simplicity of

  implementation of interconnection cabling.

  In French patents Nos. 2,617,328 and 2,661,548, a connection system having the electrical input terminals on one side of the apparatus and

  the output terminals on the opposite side.

  The object of the invention is to eliminate these drawbacks, and in particular to improve the techniques currently known, by simplifying the shapes of the

constituent parts.

  The invention relates to an electrical and mechanical locking device for contactors, intended to be placed between two contactors, comprising a flat housing and a cover, of substantially rectangular shape, two input connections and two output connections on the faces. side of the housing, two switch devices each having a pair of fixed contacts respectively connected to an input connection and an output connection, and a movable contact actuated by a movable locking element controlled by the corresponding contactor by means of a plug movement device, characterized in that the two input connections and one output connection are located on one side face of the housing while the other output connection is on the opposite side face, and in that one of said switch devices is mounted between an input and an output connection on a power line extending perpendicular to the faces

side of the case.

  According to other features of the invention: - the housing and the cover are assembled by cooperation of housing and pins inserted by force; each movable locking element is constituted by a lever carrying a power take-off constituted by two drive axes by the moving element of the corresponding contactor; the two axes are kept tight, whatever their position, by an elastic blade; ; - The axes are manually adjustable to ensure the mechanical coupling of the levers to the elements

  movers of contactors having different races.

  Other features emerge from the

  following description made with reference to the drawings

  appended showing the electrical and mechanical locking device according to the invention, implemented in the form of a module inserted between two contactors: FIG. 1, in the rest position, that is to say, standby, FIG. 2, in working position, that is to say

  locking one of the contactors.

  In FIG. 1, a housing 1 contains all the other elements constituting the device. The housing is closed permanently by a cover 1 'by means of the housings 10 located on the housing 1 and pins 10' located

  on the lid and inserted by force.

  To hold the device on both contactors, the attachment function is provided by fixed hooks 6 'located on the housing and the cover, and "movable" hooks 6, designed in one piece, and mounted on two springs 9, 9 'ensuring the action

tightening hooks 6.

  The input terminals A ', B' located on the same side face are coupled by a system of movable contacts', 5, to the output terminals: A for A ', and B, for B'. Output terminal A is located on the same side face as input terminals A ', B' and output terminal B is located on the opposite side face. The output contacts

  A and B are identical workpieces.

  The movable contacts 5, 5 ', ensuring the cuts, are mounted in slideways included in levers 2, 2'. The contact holding pressure is ensured by

springs 8, 8 '.

  The levers 2, 2 'of identical manufacture, ensuring the opening and closing of the contacts 5, 5' are rotatably mounted about a fixed axis 11, 11 'respectively, and driven in rotation by the PTO axes 3 or 3 ', of identical manufacture to the axes 11, it' able to come to mate with the moving equipment of the contactors located on either side of the housing 1. Each lever 2, 2 'carries two axes of motion 3, 3 'protruding from one side of the locking device. In the example shown in Figure 1, the two visible axes 3, 3 'are carried by the lever 2' and project from the side of the cover 1 ', while the two axes 3, 3' not visible are carried by the lever 2 and make

protruding from the bottom 1.

  These axes 3, 3 'are manually adjustable, that is,

  that is to say that one of them can be manually extracted from its housing to adapt the locking device

contactor races.

  On each lever 2, 2 'of identical manufacture, ensuring the opening and closing of the contacts 5, 5'

  are mounted in their respective housing axes 3, 3 '.

  They are held slightly tightened by the joint action of an elastic steel blade 4, 4 '. The reminder of the levers

  2, 2 'is provided by the springs 7, 7'.

  When one of the two contactors outside the housing 1 is controlled, for example the first, it actuates the corresponding drive shaft 3, 3 'by a vertical downward movement (Figure 2). It generates the rotation drive of the first lever, in this case the lever 2,

which pivots on the axis 11.

  This pivoting has two consequences: - the first is to open the contact 5, which prohibits the supply of the coil of the second contactor; the second is to prohibit mechanically the pivoting of the second lever 2 ': the end of the first lever 2 is indeed placed under the end of the

  second lever 2 'and maintains it in the rest position.

  When the first contactor is no longer powered and returns to its rest position, it releases the corresponding axis 3,3 '. The spring 7 then relaxes and returns the first lever 2 to its rest position of FIG. 1 by closing the contact 5. The electrical and mechanical locking device according to the invention provides an arrangement of connection terminals for the use of a chute

  single power supply for simplified wiring.

  It involves identical pieces for

perform several functions.

  The closure system of the housing is economical and reliable. Modular drive shafts allow locking mounting on race contactors

different.

Claims (5)

  1) Electrical and mechanical locking device for contactors, intended to be placed between two contactors, comprising a flat housing and a lid, of substantially rectangular shape, two input connections and two output connections on the side faces of the housing, two switch devices each comprising a pair of fixed contacts respectively connected to an input connection and an output connection, and a movable contact actuated by a movable locking element controlled by the corresponding contactor by means of a power take-off, characterized in the two input connections (A ', B') and one output connection (A) are located on one side of the housing (1) while the other output connection (B) is on the face opposite side, and in that one (5) of said switch devices (5, 5 ') is mounted, between an input connection (B') and an output connection (B), on a line of a yard ant extending perpendicular to side faces of the case.   2) Device according to claim 1, characterized in that the housing and the cover are assembled by cooperation of housing (10) and pins (10 ') inserted at strength.   3) Device according to claim 1, characterized in that each movable locking element is constituted by a lever (2, 2 ') carrying a power take-off constituted by two axes (3, 3') of drive   by the moving equipment of the corresponding contactor.   4) Device according to claim 3, characterized in that the two axes (3, 3 ') are kept tight, whatever their position, by a resilient blade (4, 4'). 5) Device according to claim 3, characterized in that the axes (3, 3 ') are manually adjustable to ensure the mechanical coupling of the levers (2, 2') to the movable elements of contactors having different races.