US1999811A - Time delay circuit - Google Patents

Description

April 30, 1935. E, H, HOLT 1,999,811

TIME DELAY CIRCUIT Filed Sept. 5, 1931 PELEAJE 53 F1 age ItTLTEHIF Einar H. Halfari- Patented Apr. 30, 1935 uoaau 'rmn lanar omcvrr Einar B. Holt, Chicago, 11]., animal, by memo assignments, to Associated Electric Laboratcries, Inc, Chicago, 11L, a corporation of Delaware Application September a, 10:1 Serial No. 561,017 4 omm/ (01. 171411) The present invention relates to'a time delay circuit arrangement which has for its function the performance 01' a certain duty when a speciflc event takes place for a given interval of 5 time and to continue said performance for a definite period time after the termination of said event.

The circuit arrangement or this invention has been shown in its preferred embodiment in association with a current distributing circuit, or line, and has for its-function the giving 01' an alarm signal to indicate a cessation of the current flow in that line when the current stops flowing for aoperiod of at least one-tenth oi a second, and the maintaining or that signal for a period of three seconds after the current flow has been restored.

In the associated drawing, in which the invention is diagrammatically depicted by con- 20 ventional symbols, the current distributing line is designated by the reference character L. Bridged across the two conductors of line L is the relay I which is energized when current flows in line L and which is deenergized when there is no current flowing therein. This relay I has been shown in its energized position, indicating that current is flowing in the line.

When there is a failure in the current flow in line L, relay I deenergizes and retracts its armature, thereby at the resting contact oi the armature, completing the obvious circuit of slow-torelease relay- 2. Relay 2 thereupon operates and at its armature and make contactcompletes the obvious circuit 01 slow-to-operate relay 3.

Reay I energizes when its circuit is closed and attracts its armatures 4 to I, inclusive, at its armature 4 connecting conductor 1 to ground thereby completing the circuit of relay ll by way of normally engaging contacts I or dashpot relay I, at its'armature 5 connecting conductor 8 to ground, thereby completing the circuit oi slow-to-release relay 9 by way of normally engaging contacts I! oi! dash-pot relay l4, and at its armature 0, opening a point in the circuit 01 dash-pot relay ll.

Relays 9 and .II operate when their circuits are closed by relay 3. Relay 9, upon operating, at its armatures I0 and It makes multiple ground connections to conductors 1 and 8 to hold itself 0 and relay l3 energized independently of relay 3, while at its armature l2, relay I closes a point in the circuit-of dash-pot relay ll. Relay II,

upon operating, closes the circuit of the device B, which may be any suitable type 01' signal ing, 5 recording, or registering device, to give an indiconnections supplied through armatures H and Ill, respectively, of relay 9. Relay 3 in retracting its armature 6. completes the circuit of dash- 'pot relay H by way of armature l2 and make contact of relay 9.

Dash-pot relay ll slowly elevates its plunger in the well-known manner. The plunger of relay I4 is so adjusted that three seconds is required for the plunger to be elevated enough to separate contact sets II and I6. However, when this occurs, the circuits oi relays 9 and I3 are opened, whereupon those relays deenergi'ze, relay 9 at its armature 42 opening the circuit of dash-pot relay H, and relay ll opening the circuit of the device B.

' Should there be another failure of the current flow before the plunger'ot relay I4 has separated a the contacts of the sets 15' and I6, relay 3 will open the circuit of dash-pot relay l4 and the plunger of that relay will restore without opening the circuits of relays 9 and II. Thus the circuit of the device B will remain closed.

, Relay! is so adjusted that at least one-tenth of a second elapses' after the deenergization oi relay I before it operates sufllciently to close the circuits oi relays I and i3.

From the foregoing it will be appreciated that the arrangement of this invention provides timing means which causes a signal to be given while an event is taking place, but only when such event has taken place for adeflnite length of time, and which causes said signal to be maintained for a definite period of time after the-termination of the event.

The invention having been thus described, what is considered new and is desired to have protectedby Letters Patent is pointed out in the claims which follow. v

What is claimed is:

1. In combination with a current distributing circuit, a signalling circuit, a relay connected in the'distributing circuit energized while a'potential is present in the distributing circuit and deenergizedwhenever a failure of said potential 1 occurs, means for closing said signalling circuit, timing means operated by said relay each time it deenergizes for operating the first mentioned means to close said signalling circuit whenever said relay remains deenergized for a given period of time, means operated by said timing means for maintaining said first means operated to maintain said signalling circuit closed, and other timing means operated by said first time means, when said relay reenergizes, to restore said first means and said maintaining means after a predetermined delay to thereby open said signalling circuit.

2. A time delay arrangement comprising a line circuit, a relay connected in the line circuit and energized and deenergized by the presence or absence of potential existing thereon, a second circuit, a second relay tpr closing said second circuit, timing means operated by said first relay when it deenergizes and maintained operated as long as said first relay remains deenergized, said timing means, upon operating, operating said second relay to close said second circuit whenever said first relay remains deenergized for .a given period of time, means operated by said timing means for maintaining said second relay operated to maintain said second circuit closed, and other timing means operated by the first timing means when said first relay re-energizes to restore said second relay to thereby open said second circuit a given period of time after said reenergization.

3. In a current distributing system, a current distributing circuit, a relay in said circuit energized as long as a potential is maintained in said circuit, said relay deenergized whenever a tailure in said potential occurs, a signalling circuit, means operating as a result of a deenergization of said relay oi a given duration for closing said signalling circuit, saidmeans remaining operated throughout the duration 0! said deenergimtion to maintain said signalling circuit closed, means operating as a result of. the operation of said first means for maintaining said signalling circuit closed upon the restorationoi said first means following the reenergisation of said'relay, and timing means operating as theruult of the restoration of said first means for opening said si nalling circuit at the end of a definite time periodduringwhichsaidfirstmeansremains continuously restored.

4. In combination with a current distributin circuit, a control relay in said circuit energised or deenergized according to whether said circuit is energizedor deenergized, a signalling circuit, a second relay for closing said signalling circuit, a slow-to-release relay and a slow-to-operate relay energizing as a result of deenergization of a given duration of the control relay for operating said second relay to close said signalling circuit, a maintaining relay energizing as a result of the energization of said slow-to-operate relay for maintaining said second relay operated independent of said slow-to-release and slow-to-operate relays, and a second slow-to-operate relay operatively energizing as a result of the deenergization of said slow-to-operate relay for a definite length of time following the reenergization of said control relay for a corresponding length of time for restoring said second relay and said maintaining relay to open said signalling circuit, said slow-to-release and first slow to-operate relays cooperating to prevent the operative energization of said second slow-tooperate relay following a deenergimtion of said control of a duration less than said definite length 0! time.

BINAR- H. HOLT.

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