US1773649A - Electromagnetic relay for controlling electric circuits - Google Patents

Description

19, 1930- M. TC HOUBRl'IfCl-i 1,773,649

- ELECTROMAGNETIC RELAY FOR coNTRoLL'IfiG ELECTRIC CIRCUITS Filed July 11, 1928 Fi s .1

Patented Aug. 19, 1930 UNITED STATES PATENT OFFICE MICHEL ronounnrron, or SUCY-EN-BRIE, FRANCE, ASSIGNOR T0 soornrr'i ANONYME FRANCAISE DITE: soorn'rn NOUVELLE DE couscrnuo'rrons TELEPHONIQUES BRE- vErs TCHOUBRITCH-DER-VAL, or PARIS, FRANCE ELECTROMAGNETIC RELAY FOR CONTROLLING ELECTRIC CIRCUITS Application filed July 11, 1928, Serial No. 291,954, and in France July 29, 1927,

It is well known that with certainrelays at present known and particularly relays used in connection with telephone apparatus and provided with blade contacts, arranged in tandem, one behind the other, and themselves actuated successively as soon as the main line contact enters into action, it is necessary to increase the air gap between the movable armature and the magnetic coil at the same time that the number of contacts is increased. The result is that, with equal excitation, the force of attraction exerted by the electromagnet of-the relay on the movable armature decreases when the number of contacts to be controlled increases while, on the contrary,

the position and course (movement) of the blade contacts, which makes it necessary to adjust them very carefully before putting them into service and also during service, all

these adjustments consisting in more or less plwissing the various contacting blades by The present invention relates to a novel electromagnetic relay capable of actuating a large number of contacts and constructed in such manner that the spark gap provided between the movable armature and the magnetic core is Very small (of the order of a few tenths millimeters only), whatever be the number of the contacts to be controlled.

According to the present invention also the contacts are constructed in such a manner that they practically require no adjustment either whilst being mounted position or during the course of use. Their position on the relay and the stroke having been determined once and for all in advance they remain in the normal position which they are adapted to occupy when in use after being mounted in position.

These contacts are enclosed in a block of insulating material which protects them from dust. The space required by such a relay is, with an equal number of contacts to be actuated, one-half the space required by an ordinary blade relay. The arrangement of the various members with which the new relay is provided is such as to enable a group of two relays to be combined with advantage. One method of construction of a group of two relays, arranged in accordance with the' present invention, each of the relays being provided with 24 contacts, is illustrated by way of example in the accompanying drawings, wherein Figure 1 illustrates a plan of the group of two relays.

Figure 2 shows an end view of the group.

Figure 3 is a section on the line C-D of Figure 2.

Figure 4 is a side view of a group of which an accessory (left-hand block) has been omitted.

Figure 5 illustrates to a larger scalean end View of a movable piston provided with a silver contact.

Figure 5 illustrates a side view of the same piston. v

Figure 6 is an end view of a block.

Figured is a plan view.

Figure 7 is an end view of the contact block.

Figure 7 is a section on the line EF of Figure 7.

Figure 8 is an end View, to a larger scale, of a stationary blade with its silver contact, and

Figure 8 is a side View.

In the form of construction illustrated in the drawing each of the two relays forming the group is provided with an exciting coil 1 having a core 2 and a strap 3. A movable plate 4 forming an armature is hingedly mounted on the strap 3. The free end of the movable plate 4 engages with a ring 5 which is actuated by a lever 7 pivoted on a shaft 6 and secured to a shutter 8 of insulating material drawn into its position of rest by means of a spring 14. Two supporting blocks 15 and 15,.c1a mped between two plates 16, by means of screws 17 extend the full width occupied by the two shutters 8 of the group of relays and carry contacts arranged so as to be actuated by the two relays of the group. Behind each supporting block 15' and 15 is provided a block 18 provided with a suitable number of slotted studs 19. The connecting screws are fitted into the slots of the studs 19 and are tightened in position by means of tightening screws 20. These slots may also receive a peg 23 which places the connecting screw in contact with any one of the contacts 9 (or 9) or 12 (or 12") The two'relays which form the groups are secured to a plate 21 provided with four holesl22 adapted to receive the screws for securing the group. Each of the contacts proper of the device is formed by a piston 9 (or 9') prolonged by arod 24 of slight diameter and provided with a washer 10 of alloy or silver (Figure 5 threaded on this rod. Each piston contactor, located in a cylindrical recess of the contact supporting block 15 (or 15), is subjected to the action of a conducting coiled spring 11 and bears against a stationary blade 12 (or 12') of which one end is provided with a gold and silver contact washer 13. The rod 2 1 of the piston projects from the block 15. The operation of this relay is as follows: When an excitingccurrentpasses through the will, the magnetic field which is createdinthe circuit consisting of the core 2, the strap 3, the movable plate 4 and the air gap between the said plate and the core determines the attraction of the said blade by the core. During its movement the movable plate 4 moves the ring 5 which causes the lever 7, secured to the shutter 8, to pivot about the shaft 6. At the moment in which the flywheel 8 leaves the .position A it leaves all the dpistons-9 which it forced b their rods 24 un e tion of the with rawal spring 14 and pushes their corresponding pistons 9 from the block 15.

Under the pressure of the coiled springs 11 r the 210- 1. In an electromagnet relay including the usual electro-magnet and its armature, a circuit'breaker comprising a series of independently movable contacts and a fixed contact, a shutter of insulating material arranged in opposition to the movable contacts and movable into and out vof engagement with the same to, in the former instance efiect move-- ment of the engaged movable contacts out of engagement with the fixed contact, a spring in circuit with each of the movable contacts and urging the same to engagement with the fixed contact, a spring normally holding the a shutter in engagement with the movable contacts and of a strength to overcome the springs.

for the said movable contacts,-andoperative connection between the shutter and the armature of the relay to efi'ect movement of the shutter out ofzengagement with the movable perpendicular to the pivotal axis of two of the shutters, each of which shutters controls a respective one of two sets of the movable contacts mounted side byside, a v I In testimony whereof I have signed my name to this specification.

MICHEL TGHOUBRITCH.

the movable pistons 9, which are no longer pushed by the shutter 8, bear against the stationary which they control. The reverse movement takes place as regards the pistons 9 which are pushed by the shutter which determines the opening of the circuits controlled by the contacts 9", 12. When the currentis interrupted the magnetic field ceases and the re-' turn spring 14 returns the shutter 8 into its initial position of rest A.

In the example illustrated in the drawing it is impossible either to reverse 6 circuits or to establish 6 circuits and to interrupt 6 others, these difierent operations taking place with a maximum air ga of of an mm. for

example, irrespective o the number of contacts.

What I claim is.:

blades 12, thus closingthe circuits

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