US1646234A - Electromagnetic apparatus - Google Patents

Description

1646,234 0g. 18,1927. v F. GCREED ELECTROMAGNETIC APPARATUS Filed Marc 6. 1925 2 Sheets-Sheet 1 Oct. 18; 1927.

,F. G. CREED ELECTROMAGNETICAPPARATUS Filed March 6, 1925 2 Sheets-Sheet 2 Patented Oct. 18, 1927.

UNITED STATES 1,646,234 PATENT OFFICE.

FREDERICK GEQRGE GBEED, OI GBOYDON, ENGLAND.

ELECTROMAGNETIC .APPABA'IU S.

Application filed March 6, 1925, Serial ltd-18,474, and in Great Britain March 11, 1924.

This invention" relates-tocelectroma gnetic apparatus of the kind described in the specification of former Letters Patent No.1,552,- 676, and which is specially suitable for use as a relay, switch, motor or like device, and it v present invention. Figs. 4, and 6 are similar views, to Figs. 1, 2 and 3 respectively, showing a modified construction.

In each of the examples shown, opposite- 1y and constantly polarized massive inverted U sha ed laminated pole pieces a and a are, accor ing to the present invention, fixed upon the upper ends of a non-magnetic support or frame, formed, in the examples of two members 6, 6 adapted to be carried by a base plate 2 and provided with a centrally arranged vertical plate d, also of non-magnetic material,.=which may be made in c0118 piece with the frame, or,.-as shown, may be a separate plate insertedth'rein and to which are secured upper and lower bearings e, e of which the upper one is readily removable. The laminated armature f, composed of stampings of magneticmaterial, some of which are extended at one end to form an at mature lever f as before, is fixed to a relatively long vertical spindle 9" that extends through it and the upper and lower ends of which are adapted to form pivots g, g which extend into the said upper and lower I bearings, the arrangement being such that ly arranged vertical plate d, and are carried by the support or frame b, 6 either. directly, or, as shown, by the lower bearing e part of which extends below the coil h and another part of which projects laterally through the vertical plate d and extends'below the coil.

h. The coils. are held in position vertically by the removable upper bearing e part of which extends over one coil h and another part of which projects laterally through the vertical plate d and extends over the other coil h. The coils are without spools or cores and the horizontal hole through each of them, to accommodate the armature, is of rectangular shape in cross section, as before,

and the sides thereof are arranged as close- 1y as possible to the sides of the armature, but so as to admit of the necessary oscillation of the armature, which however is of small extent. By arranging the inner sides of the coils close to the armature as described, the maximum magnetizing effect on the armature is obtainable with any given size of coil and value of electric current flowing therethrough; The ends of the coils are conare magnetized by vertically arranged. U a

shaped permanent magnets j the upper ends of which bear closely against the said pole pieces and the lower horizontal and intermediate portions of which extend through the non-magnetic support or frame b, b which is made hollow or of an openwork character. Electro-magnetic apparatus as described may be so constructed or arranged as to admit of relative adjustment between the armature and the pairs of flat faces of the pole pieces a, abetween which it works, to suit'requirement.

For this purpose, in the example shown in Figs. 1, 2 and 3, the two side members I), b

of the hollow support or frame are fixed to I a. bottom plate I) provided at its lower side -with a, centrally arranged downwardly extending plug is that pro'ects into a corresponding socket m extending from'the lower side of the base plate a, and from opposite sides of the support or frame 6, I) extend two projections, formed in the example shown, by the ends n, n of a transverse bar, against one of which, namely n acts a coiled spring 0 supported at one end by a lug c as shown to receive tnem. The baseplate 0n the base plate 0 and against the other of which, namely n, bears a horizontal adjustable screw 1' carried by a bearing 0 on the base plate. The arrangement is such that by turning the screw 1- in one direction or the other, the support or frame I), b and attached parts can be adjusted, under the con-.

trol of the spring 0, about a vertical axis that. is coincident with the axis of the armature spindle g, in order to vary the position of the armature in relation to the pole faces of the massive pole pieces a, a with which the armature co-operates. The plug is and attached parts can, by means of a screw 8 extending through the wall of the socket m and into an annular groove 10 in the plug, be prevented from rising.

In the modified arrangement shown in Figs. 4, 5 and 6, the two par-ts b, b of the support or frame are fixed to a base plate 0 and upon'the part 12 which is made Wide, is mounted a plate at carrying, on its upper side, insulated electric contacts u, u, or a contact and a stop, between which the armature lever f can work, and which, as shown, may be in the form of ad'ustable screws.

xThe plate I, which may be 0 circular shape,

in plan, is provided at one side with tubular lugs 'v, 12 through which extends an end ways adjustable transversely arranged spindie w, one lug, namely a, being plain and encircling a plain portion of the spindle w and the other lug, namely, '0 being provided with a screwed lining '0 that is pre vented from turning by means of a clam ing screw a and fits a corresponding y screw threaded portion of the spindle w. The spindle is mounted to turn in bearings w, m that are carried by the part b of the support and one of which, namel w, is plain and the other, namely an, screw t readed and fits a correspondingly screw-threaded 'portion of the spindle w, the two threadedportions of the spindle/having different pitches.

'The arrangement is such that by turning the spindle win one direction or the other,

- ,by an amountcorresponding to the differ. ence in pitch of its screws, per revolution of the spindle o, and thus alter the position of the armature in relation to the faces 'of the said pole pieces. The plate t can be caused to bear firmly uponthe lateral extension I) by providing it at one side with a lever arm 3 to which is connected oneend of a coiled spring 2 the other end of which is connected ,tothe hollow support or frame 6,12

' endsof the armature coils h, h, the armature contacts 7' and f, or contact, and the stationary contacts 10, u, or contact, may be connected to terminals 1, fixed to the underside of the base plate a, which is recessed,

the two pole pieces, and into said support,

a laminated armature extending through said coils and between the pairs of broad flat faces of the polar. projections of said pole pieces, the armature having a lateral extension or lever arm, a vertical spindle fixed to said armature and extending therethrough between the coils in each direction to omts above and below said coils, and stationary bearings for the upper and lower ends of said spindle. I

2. Electro-magnetic apparatus of the kind herein referred to, comprising two oppositely arranged massive inverted U shaped laminated pole pieces having polar projections with broad flat faces, a non-magnetic hollow supportfor said pole pieces, means for polarizing said pole pieces, a stationary vertical plate of non-magnetic material arranged centrally within and carried by said support, upper and lower bearings carried by said plate, a vertical spindle having its end portion journalled in said bearings, the upper of which is removable, a laminated armature arranged horizontally between the pairs of polar projections of said pole pieces and fixed to said spindle and an armature winding consisting of two stationary coils extending through the rectangular shaped openings formed in the two pole pieces and arranged at o posite sides of said plate and so as close y to surround the armature whilst leaving the same free to oscillate to the desired extent.

3. Electro-magnetic apparatus of the kind herein referred to, comprising two' oppositely arranged massive inverted U shaped laminated pole pieces having polar. projections with broad flat faces, a non-magnetic hollow support for said pole pieces, permanent magnets carried by said support and arranged to permanently magnetize said pole pieces, a stationary verticalv plate of nonmagnetic materialarranged cent-rally within and carried bysaid support, upper and lower bearings carried by said plate, a vertical spindle having its end portions journalled in said bearings, the upper of which is removable, a laminated armature arranged horizontally between the .pairs' 01 polar projections of said pole pieces and fixed to said spindle and an armaturewinding consisting of two stationary coils extending through the rectangular shaped "openings formed in the two pole pieces and herein referred to, compnsing two opposite- 1y arranged massive inverted U shaped laminated pole pieces having polar pro ections with broad flat faces, a non-magnetic support for said pole pieces, vertically arranged U shaped permanent magnets the upper ends of which closely embrace the said pole pieces and constantly polarize them and the lower intermediate port ons 01' which extend through said non-magnetic support, an armature winding COI'lSlSi'lIlfI or a stationary pair of removable coils extending through the rectangular shaped openings in the two pole pieces and into said support, a laminated armature extending through said coils and between the pairs 01 broad flat faces of the polar projections of said pole pieces, the armature having a lateral extension or lever arm, a vertical spindle fixed to said armature and extending therethrough between the coils in each direction to points above and below said coils. and stationary bearings for the upper and lower ends of said spindle.

6. In electro-magnetic apparatus according to claim 2, the combination with the armature and the pole pieces with which it co-operatcs, of means whereby the normal relative positions of said armature and pole pieces can be adjusted.

7. Electro-magnetic apparatus ofthekind referred to, comprising two oppositely arranged massive inverted U shaped laminated ole pieces having polar projections with hroad flat faces, a non-magnetic support for said pole pieces, means for magnetizing said pole pieces, an armature. winding extending through the rectangular shaped openings in said pole pieces and into said support, a laminated armature extending through said winding and between the faces of the said polar projections, a vertical spindle fixed to said armature, bearings for said spindle, a lever associated with said armature, devices between which said lever extends, and means for adjusting said device relatively to said lever. a

8. Electro-magnetic apparatus ofthe kind referred to, comprising two oppositely ar-- ranged massive inverted U shaped laminated pole pieces-having polar projections with broad flat faces, a non-magnetic support for said pole pieces, means for magnetizing said pole pieces, an armature winding extending through the rectangular shaped openings in said pole pieces and into said support, a laminated armature extending through said Winding and between the faces ofthe said polar projections, a vertical spindle fixed to said armature, bearings for said spindle, a lever associated with said armature, devices for said devices, adapted to, slide on said support in a direction substantially at right angles to said lever and provided with lateral lugs one of which is provided with an internal screw thread, hearings on said support one of which is provided with an internal screw thread of a different pitch to that in the said lug, and a rotary adjusting sp ndle extending through said lugs and bearings and provided with screw threads of difl'erent pitch adapted to co-operate with 'those in the screw threaded lug and bearing,-

t'or the purpose set forth.

9. Electro-magnetic apparatus ofthekind referred to, comprising two oppositely arranged massive inverted U shaped laminated pole pieces having polar projections with broad flat faces, a non-magnetic support for said pole pieces, means for magnetizing said pole pieces, an armature winding extending through the rectangular shaped openings'in said pole pieces and into said support, a lam nated armature extending through said winding and between the faces of the said polar projections, a vertical spindle fixed to said armature, bearings for said spindle, a lever associated with said armature, devices between which said lever extends, a carrier for said device adapted to slide on said support in a direction substantially at right angles to said lever and providedwith lateral lugs one of which is provided with an in ternal screw thread, hearings on said support one of which is provided with an internal sc'rew thread of a different pitch to that in the said lug, a rotary adjusting spindle extending through said In s and bearings and provided with screw t reads of different pitch adapted to co-operate with those in the screw threaded lug and bearing. a lever arm connected to said carrier and adapted to turn about the axis of said spindle and a spring arranged to act on said lever arm and press said carrier against the part of the support on which it slides.

Signed at Croydon in the county of Surrey, England, this nineteenthday of February, 1925.

FREDERICK GEORGE CREEtZL'Za between which said lever extends, a carrier

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