US2352353A

US2352353A - Time delay relay system

Info

Publication number: US2352353A
Application number: US371285A
Authority: US
Inventors: White Joe
Original assignee: Motors Liquidation Co
Current assignee: Motors Liquidation Co
Priority date: 1940-12-23
Filing date: 1940-12-23
Publication date: 1944-06-27
Anticipated expiration: 1961-06-27

Description

June 27, 1944. J wH 2,352,353

TIME DELAY RELAY SYSTEM Filed Dec. 25, 1940 INV NTOR 6/ W I 78 7s t 4 W ATTORNE QZ Patented June 27, 1944 TIME DELAY RELAY SYSTEM Joe White, Anderson, Ind., assignor to General Motors Corporation, Detroit, Mlcln, a corporation of Delaware Application December 23, 1940, Serial No. 371,285

4 Claims.

cause the high volume horn to sound also. This object is accomplished by a system including two single coil relays for withholding the connection of the high volume horn with the battery for a predetermined period after the horn switch is closed.

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawing wherein a preferred embodiment of the present invention is clearly shown.

In, the drawing:

Fig. 1 is a wiring diagram illustrating the embodiment of the present invention.

Figs. 2, 3, and 4 are fragments of the diagram shown in Fig. 1 and shows the relay of the system in different stages of operation.

According to Fig. 1 the warning signal for city driving is provided by a pair of low volume horns and 2| having different frequencies and so related that a harmonious chord is produced. For country driving or for use in an emergency the system includes a high volume horn 22. Horns 20 and 2| are connected with ground and with awire 24 connected with stationary contact 26 of a horn relay 25. Contact 26 is normally separated from contact 21 carried by armature 28, attracted by an electromagnet including core 29 and a coil 36. Armature 28 and coil 30 are connected with battery 3| grounded at 32. The circuit of the coil 30 is controlled by a control switch or horn button 33 comprising stationary contacts 34 and 35 and a movable contact 36 normally held away from the stationary contact by spring 31.

carrying a-core 42 surrounded by coil 43. Frame 4| supports a resilient armature hinge-blade 44 attached to an armature 45 which is biased normally away from the core 42. Armature 45 carries a spring blade-46 carrying a contact 41 normally out of engagement with a contact 43. Armature 45 insulatingly supports a blade 43 carrying a contact 50 normally engaging a contact 5|. Core 42 has a chromium plated pole face 42a against which the armature 45 seals when attracted to it. Core 42 is surrounded by a copper tube 42b which retards flux decay. Therefore there is a delay in the retraction of armature 45 following the open circuiting oi magnet coil 43.

The relay comprises a frame 6| supporting a core 62 surrounded by coil 63. Frame 6| supports an armature hinge-blade 64 attached to armature 65 supporting a blade 66 carrying a contact 61 normally engaging a contact 36. Blade 66 carries also a contact 63 for making engagement with a contact 10.

The

relays

46 and 60 may be mounted upon the same base to provide a double relay unit. This unit will have three terminals 1|, l2 and I3. Terminal 1| is connected by wire I4 with contact 5| .of relay 40 and by wire 15 with high volume horn 22'. Terminal I2 is connected by wire 16 with wire 24 and by wire 11 with frame 4| of relay 40 and by wire 13 with frame 6| of relay 60. Terminal 13 which is grounded at 19 is connected by wire with one end of the coil 43 of relay 40 having its other end connected by wire 8| with contact 68 of relay 60. Terminal I3 is connected by wire 82 with coil 63 of relay 60 also connected by wire 83 with contact 16 of relay 60 and contact 48 of relay 40. Wire 84 connects wire 83 with contact 50 of relay 40. The normal status of the system is shown in Fig. 1. When the horn switch 33 is closed, relay 25 is closed to connect battery 3| with low volume horns 23 and 2|. If switch 33 is closed for a period exceeding the time usually required to give the city warning signal, then the

relays

40 and 66 will operate in the manner disclosed in Figs. 2, 3, and 4 in order to connect the high volume horn 22 with the battery.

The first stage shown in Fig. 2. Following the closing of relay 25, the coil 43 of relay 43 will be connected with -the battery through the circuit indicated in heavy lines in Fig. 2. This will cause armature 45 to be attracted toward core 42 so that

contacts

41 and 43 will be closed. Following this coil 63 of relay to will be energized as indicated by the heavy dash lines in Fig. 2.

Then armature I! of relay 60 will be attracted toward core 82 as shown in Fig. 3 thereby causing contact 61 to be separated from contact 88 and contact I! to engage contact Ill. This causes coil 41 of relay 40 to be disconnected from the battery while coil 83 of relay 60 is connected with the battery independently or contacts 41 and 4! of relay 40 as indicated in heavy lines in Fla. 3.

Then armature 45 of relay Ill moves upwardly to cause the contact 50 to reengage contact II and separate contact 41 from contact 48. This establishes a circuit between wire 2! connected with relay 25 and battery 3|, and wire leading to the horn 22 as shown by the heavy lines in Fig. 4. Therefore, horn 22 is connected with battery 3| and-is caused to sound a loud warning signal.

Because a substantial period of time elapses during the operations of the relays through the various stages indicated in Figs. 2, 3, and 4, the sounding of the horn 22 has been withheld for a predetermined time after the closing of the control switch 33. In this way the sounding of the low volume signal for city driving and the high volume for country driving is controlled through a single switch or-horn button. The high volume signal is caused to sound only when the driver presses the horn button for a period longer than is usually required to give the ordinary city signal.

While the embodiment of the present invention as herein disclosed, constitutes a preferred Iorm, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

What is claimed is as follows:

1. A circuit control system comprising a current consuming device; a current source; manually controlled switch for establishing a connection in the circuit between the source and the device; and means set into action by the establishment of said connection for completing the circuit between the source and the device a predetermined time after commencement of the establishment of the said first connection, said last mentioned means including a first relay hav ing a core surrounded by a tube for retarding flux decay, a second relay having a core, each of said cores being surrounded by a single coil adapted to be connected in a different circuit, said first relay controlling a normally closed switch in the circuit of the device and a normally open switch having connections with the coil of the second relay, and the second relay controlling anormally closed switch having connections with the coil of the first relay and a normally open switch having connections with the coil of the second relay and both switches controlled by the first relay, the first coil being energized upon closure of the manually controlled means to open the first mentioned normally closed switch and close the first mentioned normally open switch whereby the second coil is in circuit with the source, the energizetion oi-the second coil opening the-second normally closed switch and closing the second normally open switch for completing another circult for the second coil with the source, the closing of the second mentioned normally opened switch opening the circuit to the first coil, said first coil, after its flux decay, permitting the first mentioned normally open switch to close and complete the circuit to the device through a circuit including the closed normally open switch of the secondary relay and the closed manually controlled switch.

2. A circuit control system comprising 9. current consuming device; a current source; manually controlled switch for establishing a connection in the circuit between the source and the device; and means set into action by the establishment of said connection for completing the circuit between the source and the device a predetermined time after commencement of the establishment of the said first connection, said last mentioned means including a first relay having a magnet coil and having means associated therewith for retarding fiux decay, said magnet controlling a normally closed switch and a normally open switch; a second relay having an armature attracting coil and an armature, said armature carrying a movable contact disposed between two stationary contacts with the movable contact normally engaging one of the stationary contacts having connections with the coil of the first relay and the other stationary contact not normally engaged having connections with the coil of the second relay and both of said first mentioned switches, said first relay when energized operating to open the first nonmally closed switch and close the first normally open switch to connect the second mentioned magnet coil in a circuit with the source, the energization of the second coil attracting the armature of the second relay to move the movable contact into engagement with the other stationary contact to maintain the energization of said coil but open the circuit to the first mentioned coil, said first relay returning, after its delayed fiux decay, to its normal position where by the first mentioned normally closed switch will complete the circuit to the device through a circuit including the closed normally open switch of the second relay and the closed manually controlled switch.

3. A circuit control system comprising a current consuming device; a current source; manually controlled switch for establishing a connection in the circuit between the source and the device; and means set into action by the establishment of said connection for completing the circuit between the source and the device a predetermined time after commencement of the establishment of the said first connection, said last mentioned means comprising a first relay and a second relay, said first relay having a single magnet coil and having means associated therewith for retarding flux decay and said second relay having a single magnet coil, both of said relays having an armature for controlling a normally closed and a normally open switch, said first relay when energized operating to open its normally closed switch and close the normally open switch to connect the coil of the second relay in a circuit, said second coil when energized operating to open its normally closed switch and close its normally open switch to retain the second coil in circuit, the opening of the normally closed switch open-circuiting the coil of the first relay, said first relay, after its flux decay, returning to its normal position to complete a circuit to the device which includes the closed manually controlled switch, the closed normally open switch of the second relay, and the normally closed switch oi the first relay, said device remaining connected with the current source so long as the manually controlled switch is closed.

4. A circuit control system comprising a current consuming device; a current source; manually controlled switch for establishing a counction in the circuit between the source and the device; and means set into action by the establishment of said connection for completing the circuit between the source and the device a predetermined time after commencement of the establishment of the said first connection, said means comprising two relays each having a core and a single magnet coil surrounding its core, one of the relays being relatively fast-operating and the other being a time-lag relay having fluxdecay-retarding means, each relay having a normally open switch and a normally closed switch, said switches being respectively closed and opened when the relay is energized, and circuits in series with the manually controlled switch, one of the circuits comprising the two normally open relay switches connected in parallel and a second parallel circuit connected in series with the first parallel circuit and comprising the coil of the fast-operating relay in parallel with a circuit comprising the normally closed switch or the time-lag relay and the current consuming device, and another circuit parallelling said series of parallel circuits and comprising the normally closed switch of the fast-operating relay and the magnet coil of the time-lag relay, whereby, upon closure of the manually controlled switch, the time-lag relay operates to close its normally open switch to connect the coil of the fast-operating relay with the source while opening its normally closed switch to prevent the connection of current consuming device with the current source, and the fast-operating relay operates to close its normally open switch to provide for connection of its coil with the current source independently of the .then closed switch or" the time-lag relay, and the fast-operating relay operates to open its normally closed switch to disconnect the coil of the time-lag relay from the current source, and the time-lag relay finally operates to restore its switches to normal status whereby the current consuming device is connected with the source through the manually controlled switch, the closed normally open switch of fastoperating relay and the normally closed switch of the time-lag relay.

JOE WHITE.