US3284734A - Time-delay relay with axially aligned poles - Google Patents

Time-delay relay with axially aligned poles Download PDF

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Publication number
US3284734A
US3284734A US381305A US38130564A US3284734A US 3284734 A US3284734 A US 3284734A US 381305 A US381305 A US 381305A US 38130564 A US38130564 A US 38130564A US 3284734 A US3284734 A US 3284734A
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Prior art keywords
time
extremities
energization
normal position
delay
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Expired - Lifetime
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US381305A
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English (en)
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Schleicher Helmut
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F3/00—Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals with driving mechanisms, e.g. dosimeters with clockwork
    • G04F3/06—Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals with driving mechanisms, e.g. dosimeters with clockwork with electric driving mechanisms
    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F8/00—Apparatus for measuring unknown time intervals by electromechanical means
    • G04F8/08—Means used apart from the time-piece for starting or stopping same

Definitions

  • Time-delay relays of the specified kind generally comprise a timing member, usually in the form of a synchronous motor, a delay member which can be activated and inactivated through clutch means, and a time switch. Excitation causes the delay member to be coupled to the timing member by the clutch. At the end of the preset delay time the time switch is operated. When the relay is de-energized the delay member is restored to its preset position, usually by spring means stressed during the period of delay.
  • Mechanical clutch means including gear wheels, bevel wheels or discs require movable components which are subject to wear.
  • time-delay relays are frequently used which include devices for changing the time range. For effecting this adjustment of their operating range, special means are usually provided and these are accommodated outside the timing dial. If several such time-delay relays are used in the same plant, for instance in cascade, then the space occupied by such an assembly is often objectionably large.
  • the time-delay relay proposed by the invention eliminates these disadvantages by providing an arrangement in which a positively driven timing member ends in one pole of an electromagnet, whereas an entrainable delay member rigid with a timing switch forms the other pole of the electromagnet, the two poles coaxially adjoining each other in such manner that energization or de-energization of the exciting coil couples or uncouples the two poles for joint rotation without causing relative axial movement therebetween.
  • Another advantage of the invention is that error introduced by the delay in the response of mechanical clutches is eliminated, since the magnetic flux becomes effective instantaneously.
  • the magnitude of the flux should be sufficient to insure a coupling action which is free from any time lag yet should permit relative rotation, at the end of the delay time, between the driven pole member and the entrained pole member, thus upon continuing operation of the motor following closure of the contacts of the time switch while the relay coil is still energized.
  • the magnetic coupling action continues, with a relative slipping of the two pole members, until the coil is de-energized, whereupon the entrained member returns to normal under the action of its restoring means. When this is the case the delay member and its contact arm are restored to their preset position by a restoring spring.
  • the mechanical wear to which the two cooperating surfaces of the pole members are thus subjected may be eliminated in various ways. For instance, a small air gap could be provided between the two coaxial members. However, this would offer a serious obstacle to the generation of sufficient entraining power because the magnetic energy decreases in proportion to the square of the distance across such a gap. Moreover, the maintenance of an air gap of precise width would involve considerable difliculties in production.
  • the invention therefore proposes to coat the surface of at least one of the poles with a non-abrasive, magnetically neutral material. The existence of this coating has the effect of keeping the two magnetic faces at a precisely defined axial distance whilst at the same time reducing wear to a minimum.
  • the pole face or faces may be thus treated mechanically or electrolytically.
  • a mechanical treatment would consist for instance in interposing a solid lubricant such as graphite, molybdenum disulphide or like substances between the faces, whereas an electrolytic treatment might consist in the electrodeposition of a hard metal coating, for instance a coating of chromium, tantalum or titanium.
  • Another feature of the invention consists in providing the relay with a central shaft for changing the time range of the relay, said shaft passing through the poles of the electromagnet and through all the axially aligned components.
  • the entire relay including all its components, such as the time setting mechanism, the time delay member and time switch, the poles, the exciting coil, the driving motor constituting the timing member, gearing, if any, and so forth, are disposed around this central common shaft.
  • This disposition of all the components about a common shaft facilitates assembly of the relay as well as the subsequent provision of additional components such as gear means and the like.
  • the described construction reduces the space required in the radial direction for mounting the device by utilizing a greater axial depth in the direction of the center shaft. In the majority of applications this is a convenience because in this direction more space is usually available.
  • a geared driving motor 1 rotates a gear wheel 2 aflixed to a tubular pole member 3 which has the form of a sleeve partially surrounded by an electromagnetic coupling coil 4. An adjoining end of a similar pole-forming sleeve 5 is also surrounded by the coil 4. The motor therefore imparts rotation to sleeve 3 through its reduction gearing 11 which includes a pinion 12.
  • coil 4 When coil 4 is energized, the ensuing electromagnetic fiux couples the two poles 3 and 5 for common rotation.
  • Pole 5 constitutes the timedelay member and is formed rigid with an actuating arm 6 adapted to cooperate with a contact not shown in the drawing, to close an external circuit in an off-normal position.
  • a restoring spring 7 Upon de-energization of the coil 4 a restoring spring 7 returns pole member 5 to its normal angular position in which the control arm 6 rests against a stop 13.
  • a control shaft 8 extends outwardly from the speed changer 1' and passes centrally through all the components of the relay including the two poles 3 and 5. This shaft serves for selecting the time range by rotation of a selector button 9.
  • a second rotatable knob 10, journaled in a support 15, serves for setting the delay time within the selected range by displacing the stop 13 to vary the range of rotary entrainment of sleeve 5, a pointer 11 being rigidly connected to this sleeve for indicating the position of the latter.
  • a nonmagnetic and abrasion-resistant coating 14- is shown interposed between the confronting extremities of pole members 3, 5 by being carried on one of them, e.g. the sleeve 3.
  • a time-delay relay comprising drive means, a first pole member positively coupled with said drive means for rotary entrainment thereby, a second pole member coaxial with said first pole member axially adjoining same,
  • electromagnetic coil means surrounding confronting extremities of said members whereby said members are magnetically coupled for joint rotation upon energization of said coil means, an actuating element positively connected with said second member for displacement thereby from the normal position into an off-normal position for the closure of an external circuit upon energization of said coil means, restoring means effective upon de-energization of said coil means for returning said second member to said normal position, and an abrasion-resistant nonmagnetic coating on one of said confronting extremities and in constant contact with the other of said extremities for maintaining the extremities at a precisely defined axial distance.
  • a time-delay relay comprising drive means, a first pole member positively coupled with said drive means for rotary entrainment thereby, a second pole member coaxial with said pole member axially joining same, electromagnetic coil means surrounding confronting extremities of said members whereby said members are magnetically coupled for joint rotation upon energization of said coil means, an actuating element positively connected with said second member for displacement thereby from the normal position into an off-normal position for the closure of an external circuit upon energization of said coil means, and restoring means effective upon de-energization of said coil means for returning said second member to said normal position, said driving means comprising a motor provided with a reduction-gear means and with a control shaft extending from said reduction-gear means, said pole members being sleeves supported on said control shaft.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Relay Circuits (AREA)
  • Mechanical Operated Clutches (AREA)
US381305A 1963-07-16 1964-07-09 Time-delay relay with axially aligned poles Expired - Lifetime US3284734A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DESCH33577A DE1239761B (de) 1963-07-16 1963-07-16 Mechanisches Zeitrelais mit elektromagnetischer Kupplung

Publications (1)

Publication Number Publication Date
US3284734A true US3284734A (en) 1966-11-08

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ID=7432848

Family Applications (1)

Application Number Title Priority Date Filing Date
US381305A Expired - Lifetime US3284734A (en) 1963-07-16 1964-07-09 Time-delay relay with axially aligned poles

Country Status (6)

Country Link
US (1) US3284734A (de)
AT (1) AT247949B (de)
CH (1) CH408164A (de)
DE (1) DE1239761B (de)
GB (1) GB1055388A (de)
SE (1) SE325629B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3713053A (en) * 1971-10-18 1973-01-23 Deltrol Corp Reset timer

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1597851A (en) * 1919-09-03 1926-08-31 Westinghouse Electric & Mfg Co Time-limit relay

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB700925A (en) * 1951-04-05 1953-12-16 English Electric Co Ltd Improvements in and relating to timing devices and to clutches therefor
FR1301980A (fr) * 1961-07-13 1962-08-24 Relais à action différée

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1597851A (en) * 1919-09-03 1926-08-31 Westinghouse Electric & Mfg Co Time-limit relay

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3713053A (en) * 1971-10-18 1973-01-23 Deltrol Corp Reset timer

Also Published As

Publication number Publication date
AT247949B (de) 1966-07-11
CH408164A (de) 1966-02-28
SE325629B (de) 1970-07-06
GB1055388A (en) 1967-01-18
DE1239761B (de) 1967-05-03

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