US1832477A - Electromagnetic switch - Google Patents

Description

Nov. 17, 1931- F. J. CALLINGHAM ELECTROMAGNETIC SWITCH Filed Feb. 17, 1931 2 Sheets-Sheet l NOV. 17, 1931. CALUNGHAM 1,832,477

ELECTROMAGNETIC SWITCH Filed Feb. 17, 1931 2 Sheets-Sheet 2 Figure 2.

Patented Nov. 17, 1931 UNITED STATES FREDERICK JAMES CALLINGHAM, OF BRIGHTQN, ENGLAND ELECTROMAGNETIC SWITCH Application filed February 17, 1931, Serial No. 516,417, and in Great Britain February 8, 1930.

This invention relates to, and has for its object the provision of improvements 1n, electromagnetic switches.

The inventionconsist-s broadly in the arrangement according to which the magnet is suspended between two pivot bearings. In order that the invention may be the more clearly understood, a switch in accordance therewith will now be described reference being made to the accompanylng drawings, wherein Figure l is a front elevation of said switch.

Figure 2 is a side elevation of the same.

Figure 3 is a section on line ABCD of Figure 4 is aside elevation, shown in section' on line GH of Figure 5 of the elements whereby the magnet is mounted.

Figure 5 is a section on line EF of Figure 4;

Referring to the drawings the magnet 1 is in the form of the letter E and carries the winding 2 on the centre limb. The

three polar ends thus formed have their surfaces levelled to a common plane and. the armature 3 takes the form of an oblong piece having a plane surface adapted when said armature isattracted to rest flush on these three surfaces. 7

The magnet 1 is fixedly located in the following way y In the first place it is supported upon a support which permits adjusting movement of the magnetwith respect thereto about anaxis XX at right angles to the general plane of the magnet and located in the plane of the surfaces of the polor-ends a convenient distance outside the geometrical limits of the magnet. in the second place it is supported upon a suppbrt which is such as to permit universal adjusting movement of the magnet with respect thereto about a point Y beyond its geometrical limits the opposite end and, say, in the centre line of the back or connecting limb. in construction said axis XX and/or said point Y are arranged in such a way that during mounting or ad justing of the magnet they can take up the position required by the unconstrained d mensions of the magent and itwill thus be seen that said magnet is fixedly located without the possibility of its being distorted.

The armature 3 is universally pivoted about the point Z at, say, its centre ofgrav ity to an armature carrier 4 one end of which is pivoted about the aforesaid fixed axis XX. This armature carrier 4 has rigidly mounted thereon, in a manner which will be clear from the drawings, an insulating bar 5, which in turn carries, through the medium of resilient arms 6, the tour moving contacts {I of the switch, Thus in the usual way when the magnet winding 2 is energized the armature 3 is attracted and the carrier 4 is turned about the axis XX thereby pressing the movable contacts 7 against the respective fixed contacts (not shown), the arms 6' being flexed to ensure good contact. When the winding 2 is de energized the resilient arms 6 start the return movement which is completed by gravity.

, Describing the constructional details, the

magnet 1 has a pair of identical plates 8 secured flush against the respective flanks thereof, which plates conform to the E shape of the magnet except that they have lugs 8a and 8b projecting at the respective ends The lugs 8a have a pin 9 passing transversely through them and also through two upright, arms 10 of a bracket mounted on a fixed panel 13. In this way the magnet 1 is supported about the aforesaid fixed axis X-X.

The lugs have a pin 11 passing through them and also through a bore hole in the enlarged head 12 oi a bolt which is bolted to said fixed panel 13. This bore hole is counter bored at both ends as shown so that thepin 11 only bears in the centre portion, andin this way the magnet is universally supported about the aforesaid fixed point Y.

The bolt head 12 and/or the bracket carrying the'arms 10 are not screwed down until after the connection to the magnet is established and it will thus be seen that the bolt and/or the bolts securing the bracket will be able to adjust themselves to some extent within the bolt holes through the panel 13 and thus as before stated the magnet will be rigidly fixed in such a way as to be free from distortion.

When the magnet 1 is mounted in position the back or connecting limb is parallel and close to the panel as shown.

The armature 3 consists of a number of laminations clamped on either side of a centre plate 14 by means of two outside plates 15 which are held together by means of rivets passing through the laminations of all three plates. The armature carrier 4 consists of a channel section lever and the armature 3 is pivoted between the channel walls of this lever by means of a pivot pin 16. This armature carrier is rotatable about the aforesaid axis X-X by being pivoted about the same fixed pin 9 to which the side plates 8 of the magnet are pivoted.

The bearing of the armature 3 on the pin 16 is taken by the centre plate 14 only, the holes in the plates 15 and in the laminations being considerably larger than said pin 16. Thus said armature 3 as well as being oscillatable about the axis of said pin 16 is also oscillatable within limits about any diameter of the bearing hole in the centre plate 14:. In other words said armature is universally pivoted about the point Z at the centre of said bearing hole and is thus-free to move universally in finding its seating against the magnet. This freedom is augmented by virtue of the fact that the pivoting of the armature carrier 4 about the pin 9 is such that a limited amount of rocking and sideway movement as well as rotary movement is permitted.

The armature carrier is prevented from falling away from the magnet beyond a given limit by means of a plate 17 mounted as shown on the head 12.

Two air gaps 18 are formed in the magnet core, one between each of the outer limbs and the centre limb. In this way residual magnetism in the core is prevented.

Additional (or they may be alternative) air gaps are formed in the armature one on each side of the centre limb.

What I claim and desire to secure by Letters Patent is 1 1. In an electromagnetic switch, a magnet supported upon two supports, one of said supports being such as to permit universal adjusting movement of the magnet with respect thereto.

2. In an electromagnetic switch, a magnet supported upon two supports, one of saidsupports being such as to permit universal adjusting movement of the magnet with respect thereto, the other support being such as to permit adjusting movement of the magnet with respect thereto about a single axis only.

3. In an electromagnetic switch, a magnet, a pair of plates one secured on either side of said magnet and having portions extending beyond the limits of the magnet, said extending portions being supported upon two supports, one of said supports being such as to permit universal adjusting movement of the magnet'with respect thereto.

4:. In an electromagnetic switch, a magnet supported upon two supports, one of said supports being such as to permit universal adjusting movement of the magnet with respect thereto, and a universally pivoted armature cooperating with said magnet.

5. In an electromagnetic switch, a magnet supported upon two supports, one of said supports being such as to permit universal adjusting movement of the magnet with respect thereto, and a universally pivoted armature cooperating with said magnet, said armature being pivoted about its center of gravity.

6. In an electromagnetic switch, an armature, and means for supporting said armature at its center of gravity for universal movement.

7. In an electromagnetic switch, a magnet supported upon two supports, one of said supports being such as to permit universal adjusting movement of the magnet with respect thereto, the other support being such as to permit adjusting movement of the magnet with respect thereto about a single axis only, and an armature cooperating with said magnet, said armature being mounted to swing about the axis of the second support.

Signed at London, England, this 6t day of February, A. D. 1931.

FREDERICK JAMES CALLINGHAM.

Images