US2274013A - Time delay relay - Google Patents

Description

Feb. 24, 1942. p, w, swENsoN 2,274,013

TIME DELAY RELAY Filed June 28, 1940 IIHI'IMP INVENTOR R W SWENSON A T TORNE V resistance, itfloiidimbtmtrtherevwiil :hfi'xCOB-fidi? er'able margin between thevmzximaimacimuiticur- 2 iit withsmaximuml-mltadeuanti .minimsm fly.

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extends in series through both windings and rear ends which extend eely oug holes in when closed, the armature is attracted only to the ends or the arms of the bracket 8 by means such an extent as to close one pair oi. the conof which the armature is pivoted to the bracket. tact springs, this initial first step moyement'of I. For a full disclomre oi the U-shaped hinge 6 may, for example, have between the cross-reach of the armature and the pole face 3 of the core.

Supported on each end of the heel-piece 2 is a spring pile-up, each pile-up comprising a plurality of contact springs of which some are active or operating springs, such as I! and II, and of which others are passive springs such as ll and i6, and a pair of winding terminal lugs I1 and l8. Each pile-up is clamped to the heel-piece 2 by screws I! which extend through aligned holes in the clamping plate 2|, in the terminal lugs i1 and It, in the bracket I, in the heelpiece 2, in the spacer II, in the springs II to Ii, inclusive, and in the strips of insulation 82 to 28, inclusive, into threaded holes in the clamping plate 30. The insulating strips 22 to II serve to insulate the terminal lugs l1 and II and the springs I3 to is, inclusive, from each other. from the clamping plates II and ll and from the heelpiece 2. The screws ll are also suitably insulated in the well-known manner from the terminal lugs H and I8 and from the contact springs II to M, inclusive, by insulated bushing! which surround their threaded shanks.

For operating the springsof each pile-up, an operating stud ill of insulating material is associated with each pile-up and is engaged against the armature 9. The stud II is ring-staked to the operating spring i3, extends freely through the passive spring I with its outer end separated from the operating spring Ii by a stud gap, whereby when the armature is attracted, the

springs l3 and I5 are successively operated into engagement with springs ll and I. The springs is are tensioned to normally bias the end of the armature against the backstop nut ll. It will be noted that the contact gap between springs l3 and I4 is adjusted to be narrower than the contact gaps between the other pairs of springs of the relay, so that upon the attraction of the armature toward the core, the springs II and I make their contacts first.

The relay may be provided with a sleeve 3! surrounding its core between the core and the coil 4 asdisclosedinFig.2inlieuoftheslug'l. It is to be further understood that the spring pileups of the relay may comprise anydesired number and combination of contact spring! within the operating capacity of the relay.

The operation of the relay will now be considered in connection with the circuit diagram of Fig. 2 in which the have been disclosed as separate armatures, each operating aseparate spring pile-up. when the operating circuit of the relay is initially closed, it extends from ground through any desired circuit closer, thence serially through the non-inductive winding 8 and'the operating winding I to grounded battery. The non-inductive winding a resistance or I50 ohms and the operating winding may have a resistance of 1000 ohms. With the non-mductive winding} connected in series with the operating winding ,the operatingwindingsehupaflux in the magnetic circuit of the which is mly two legs of the armature l mfiicienttooperatethearmaturetomch sitionasto closethecontact springs ll butnottomove spring ll intoengagement s ring I! ortooperatetheother contact Thebuiiding upofthisiiuxisdelayedduetothe provision of the short-circuited sleeve 81 or slug inglbecomesincreasedwherebythefluxflowingthroughthemagnetlccircuitof therelayis increasedtoavaluerequisitetofullyowlte the armature. Thebuildingupotthisincreasedflux value is, however, delayed due to the provision o! the short-circuiting sleeve 32 or the slug I. When after this second interval. the armature becomes fully operated, the remaining springs of the spring pile-ups, such as springs I0 and II, become enga ed.

From the foregoing description it will b2 seen that the applicant has, simply by the provision of an additional relay winding, of armature-operated contacts for removing such winding from the normal series connection with the operating winding of the rein-mend of a short-circuiting sleeve or slug, devised a relay which operates its armature in two slow-to-operate steps thereby securing a longer operating time. It will be obvioustothoseskilledintheartthattherelay may be further simplified by placing the non-inductive winding 6 as a separate resistance external to the relay, but normally connected in series with the operating winding I.

What is claimed is: V

1. In combination, a core, an armature cooperating therewith, a plurality of contact springs operable by said armature, a short-circuited sleeve and an operating winding on said core, a resistance, a source of current, an operating circult including said source of current, said operating winding and said resistance in series, whereby upon the closure of said circuit said windingproducesaiiowoffluxinsaidcoreretarded in its build up by said sleeve to operate saidarmatureonlysumcientlytocloseonepair of said contact springs, and a shunt around said resistanuclcsedbysaidonepairofsprings whereby said winding produces a further flow of flux in said core, retarded in its buildupbysaid sleeve, to fully operate said armature to operate the remaining contact springs.

operable 2. In combination, a core, an armature cooperating therewith, a plurality of contact springs by said armature, a short-circuited sleeve an operating winding and a non-inductive winding on said core.-a source of current, an opmature tooperate theremainhm springs.

mm. W. swsusou.

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