Sept. 17, 194.6. 2,407,744 J, H_ HQRMAN ELECTROMAGNETIC RELAY 2 Sheets-Sheet 1' Filed April 21, 1944 ‘ INVENTOR Jr!» 11/ M BY 2 / ATTOXEYJ Sept. 17, 1946. J, H. HORMAN‘ 2,407,744 ELECTROMAGNETIC RELAY Filed April 21, 1944 ' 2 SQeets-Sheet 2 J. zATTOFQNEYZ 2,407,744 Patented Sept. 17, 1946 UNITED STATES- PATENT OFFICE 2,407,744 ELECTROMAGNETIC RELAY John H. Herman, Tuckahoe, N. Y., assignor, by mesne assignments, to Allied Control Company, Inc., New York, N. Y., a corporation of New York Application April 21, 1944, Serial No. 532,081 4 Claims. (Cl. 175—336) 1 This invention relates to electromagnetic re lays. - Relays mounted in airplanes are subjected to severe shocks during the operation of the plane by reason of power dives and other causes. These irrespective of shocks to which the relay may be subjected. Other objects, novel features and advantages of this invention will become apparent from the following speci?cation and accompanying draw shocks frequently cause improper operation of the so-called clapper-type relays. These relays, ings, wherein: therefore, are unsuitable for use in airplanes. An object of this invention is an electro bodying the invention; magnetic relay which is dynamically balanced 10 to nullify the effects of shock or the acceleration of gravity. } Fig. 1 is a plan view of a magnetic motor em Fig. 2 is a front view thereof; Fig. 3 is a section on the line 3-3 of Fig. 1; Fig. 4 is an end view partly broken away of Fig. 1, and ‘ Figs. 5 and 6 are sections on the lines 5—~5 and A further object is an electromagnetic relay 6-6 respectively of Fig. 3. having a high magnetic efficiency. A substantially U-shaped sheet metal frame A still further object is an electromagnetic 15 It has two apertures in its bight portion through relay in which the various air gaps in the mag- ' ‘which extend bolts Ii having square heads 52 netic circuit are at all times duplicates of each resting on the inner surface of the frame. A other and have parallel boundaries. plate It of insulating material rests on the inner According to this invention, the relay com prises two U-shaped magnetic metal members 20v surface of the‘ bight portion of the frame and has two recesses receiving the heads 12. The supported for relative rotation about an axis bolts H constitute means by which the frame central of each member and each member hav may be attached to a support. ing a center section perpendicular to said axis A second substantially U-shaped member Hi and a pair of legs parallel to said axis. The legs of each member extend toward the other mem 25 of magnetic metal has its bight portion resting on the plate 13. and has a centrally arranged hollow ber and each leg terminates in a plane face post is. of magnetic metal attached thereto. The oblique to said axis and at the same angularity lower portion of the bore of the post I5 is screw to the plane of the center section of either U threaded and receives a screw-threaded plug 16 shaped member. An axial magnetic metal member provides a ?ux path between said two 80 having a central recess in its upper face. The lower face of the plug 16 is provided with a U-shaped members and a coil surrounds said screw-driver slot by means of which the plug it axial member with the coil being partially re may be rotated to adjust it vertically in the post ceived by each U-shaped member and being ?xed to one U-shaped member. Biasing means i5. In the upper portion of the bore of the post are provided for orienting one U-shaped mem 35 i5 is arranged a bushing H. A coil 18 surrounds ber relative to the other to produce a gap be the post I5. tween the opposing leg faces when the coil is de A shaft l9 extends through the bushing l1 energized. Energization of the coil causes ?ow which constitutes a bearing for the shaft and of magnetic flux through the two U-shaped mem the shaft has a pin 25 projecting into the recess bers providing a force tending to bring the op 40 in the upper surface of the plug l6, whereby the posing leg members into alinement and reducing shaft is journalled for rotation about the axis the gap between the opposing leg faces. Such of the post Hi. The upper end of the shaft 19 arrangement produces a high torque on the ro projects slightly above the top of the post It tatable U-shaped member as well as a balanced pull thereon. With the coil tie-energized, a 45 and is connected centrally to the bight portion of a second substantially U-shaped member 2! predetermined spacing of the oblique surfaces is of magnetic metal. The two members 14 and maintained by the biasing means irrespective of 2| are of the same shape and have their legs shocks applied to the relay from any cause and extending toward each other. Each leg termi the two U-shaped members are retained with the oblique surfaces in juxtaposition upon ener 50 nates in an oblique face so arranged that the legs of one U-shaped member may meet the legs gization of the coil by reason of the magnetic of the other U-shaped member along lines ob pull exerted between them. Contacts carried by lique to the axis of the post I5. The member 2| the movable U-shaped member are, therefore, is rotatable relative to the member l4 and a stop de?nitely retained in either of two positions ac cording to whether the coil is energized or not 55 22 is provided to prevent the opposing surfaces to 2,407,744 of the two members I4 and 2| from actually contacting with each other. extending toward the other member and each leg terminating in a face oblique to said axis at The frame ID has two inwardly directed ears 23 which support a block 24 of insulating ma terial which is attached thereto by bolts 25. A plurality of contacts 26 are supported by the block 24 which has a central opening coaxial with the same angularity, a central axial magnetic metal member providing a flux path between said two U-shaped members, and a coil surrounding said axial member with the coil being partially received by each U-shaped member and ?xed to one U-shaped member. 2. A device of the character described compris the shaft l9. , ‘A substantially S-shaped ‘plate 21 rests on the upper surface of the U-shaped member 2| and 10 ing two U-shaped magnetic metal members pro on the member 21 rests a spacing block 28 of in vided with magnetic metal means supporting said sulating material which in turn supports a sec ond block 29 of insulating material to which are attached contact arms 38 for co-operation with members for relative rotation about an axis cen tral of each member and constituting a ?ux path between said members, each leg terminating in the contacts 26. The S-shaped plate 21, together 15 a face oblique to said axis at the same angularity, with the two blocks ‘28 and 29 are attached to the and a coil surrounding said supporting means U-shaped member 2| by bolts 3|. The ends of the S-shaped member 2? are connected by springs with the coil partially received by each U-shaped 32 to ears 33 struck out from the frame 10. The arrangement of the member 21 is such that the springs 32 tend to rotate the U-shaped member 2! away from the U—shaped member M. A stop 34 is provided for limiting movement of the mem ber 2| under the in?uence of the springs 32. member and ?xed to one U-shaped member. 3. A device of the character described compris ing a stationary ?rst U-shaped magnetic metal member, a second U-shaped magnetic metal member supported from said ?rst U-shaped mem be‘: for rotation about an axis central of both said U-shaped members by magnetic metal means pro With the coil l8 de-energized, the springs 32 25 viding a ?ux path between said two members, maintain the member 2| in such position as to said U—shaped members being arranged with the have a large gap between the opposing faces of legs of each extending toward the other and the two U-shaped members and the contact arms each leg terminating in a face oblique to said have one relationship with the contacts in this axis at the same angularity, and a coil surround position of the U-shaped member 2|. Upon en ing said flux path means with the coil being par ergization of the coil IS, the U-shaped member tially received and supported by said ?rst U 2| is rotated against the action of the springs to shaped member and extending into said second locate it in contact with the stop 22 thereby re U-shaped member. ducing to its minimum the gap between the op 4. A device of the character described compris posing suriaces of the two U-shaped members ing a stationary first U-shaped magnetic metal | 4 and 2i. In this position of the member 2|, member, a hollow post connected centrally to the contact arms have a different circuit relation said ?rst U-shaped member, a shaft journalled with respect to the contacts. The U-shaped mem in said post, a second U-shaped magnetic metal ber 2i remains in the position just described as member centrally connected to said shaft, each long as the coil is energized and upon de-ener-‘ 40 U-shaped member having its legs extending to gization of the coil is returned to its original ward the other and each leg terminating in a position by the springs 32. face oblique to said axis at the same angularity, I claim: 1. A device of the character described compris ing two U-shaped magnetic metal members sup-‘ ported for relative rotation about an axis central of each member with the legs of each member and a coil surrounding said post with one end received in said ?rst U-shaped member and its remaining end extending into said second U shaped member. JOHN H. HORMAN.