US2571580A

US2571580A - Bearing device for relay armatures and the like

Info

Publication number: US2571580A
Application number: US70073A
Authority: US
Inventors: Jorgensen Anders Ossian
Original assignee: Telefonaktiebolaget LM Ericsson AB
Current assignee: Telefonaktiebolaget LM Ericsson AB
Priority date: 1948-01-28
Filing date: 1949-01-10
Publication date: 1951-10-16
Anticipated expiration: 1968-10-16
Also published as: GB656539A; BE486731A; NL74208C; NL144516B

Description

Oct. 16, 1951 A. o. JORGENSEN BEARING DEVICE FOR RELAY ARMATURES AND THE LIKE Filed Jan. 10, 1949 FIGS.

- INVENTOR. AND/8R5 OSSlAN JORGENSEN BY 12% Fa ATTORNEYS Patented Oct. 16, 1951 BEARING DEVICE FOR RELAY ARMATURES AND THE LIKE.

Anders Ossian Jiirgcnsen, Traneberg, Sweden, assignor to Telefonaktiebolaget L M Ericsson, Stockholm, Sweden, a company of Sweden Application January 10, 1949, Serial No. 70,073 In Sweden January 28, 1948 The present invention relates to a bearing device for armatures on electromagnetic relays and similar switching devices. For such a bearing device certain requirements must be fulfilled. It should, among other things, be so manufactured that the magnetic permeability is as great as possible. Furthermore no sliding should arise when the armature is moving. Moreover, the armature should, when operated, always occupy identical external positions, because otherwise the magnetic circuit is changed from time to time. Finally the bearing must be cheap to manufacture. According to the present invention these requirements are complied with in a simple manner by means of a bearing device, in which the armature by means of one or more leaf springs is connected with a plate, which is arranged to be attached to a plane area adjacent one end of the core of the relay, the back part of the armature also resting against said plate.

The invention will be described more closely with reference to the annexed drawing. Figs. 1, 2 and 3 show different details of a relay with the proposed armature bearing. Fig. 4 illustrates these details assembled on a relay with the armature in its operated position and Fig. 5 shows in exaggeration a detail of the armature bearing after the armature has moved into its released position.

The details in Figs. 1 and 2, which consist of an armature 2! with a bearing plate 22 and a spring l8, are intended to be mounted on the back plane l2 of the core shown in Fig. 3, which in a manner known per se may be manufactured of sheet-iron. This plane I2 is parallel to the axis of the winding space IS on the core. A lower plane area |5 borders plane |2 at the sides and end. The spacing of the planes is such that the spring l8 shown in Fig. 2 together with a rivet head for its fastening have clearance between them. For control of the plate 22, shown in Fig. l, dowels I6, adapted for holes 2| in the plate 22, have been fixed on the plane I 2. Furthermore there is a threaded hole I! in the plane I2 and a corresponding hole 2! in the plate 22 for the assembly screw 30, Fig. 4. The spring l8, Fig. 2, is provided with two holes l9 to receive rivet studs 23 on the under surface of the plate 22 and with holes 20 to receive rivet studs 24 on the armature 2| shown in Fig. l. The plate 22 consists of rather thin sheet iron with a lip 28 overhanging the end of the armature and formed in such a way that it reinforces the spring against shocks for accidental striking of the armature which might move it out of position.

1 Claim. (Cl. 345) In Fig. 4 the armature 2| and the plate 22 are riveted to the spring l8 by means of the

studs

23, 24. This assembling takes place in a suitable fixture, which determines the position of the armature 2i and the plate 22, respectively. For this purpose the holes l9 and 20, respectively, in the spring l8 are oversize permitting a minimum setting of the distance d between the armature 2| and the plate 22, i. e. 0.2 to 0.3 mm. The holes I 9, 20, which are nearest each other, should be such a distance from one another, that the spring between them is of a sufficient length. This length should be such that no fatigue arises when the armature is operated and released. The plate 22 is held against the plane |2 by means of the screw 30.

The relay construction shown in Fig. 4 consists of a so-called fiat-type relay, in which the armature is mainly parallel with the core of the relay. The armature 2| operates a contact group 44, by a change in the energization of winding 45, by means of the movement of its front part 29 with respect to the pole shoe l4 and by means of operating means 4| known per se.

Fig. 5 intends to illustrate how the spring I8 is bent when the armature 2| changes into breakposition. As the spring I8 is lying in the space between the plate 22 and the plane l5 it has room to bend in the prescribed manner. The above-mentioned lip 28 receives shocks when the armature is exposed to accidental blows. The armature 2| may also be provided with a protective shield extending in under the nearest edge of the plate 22. This shield may be fastened by means of the rivets 24 simultaneously with the spring l8.

Assuming that the distance between the center of the pole plate l4 and the bearing place of the armature 2| is I, Fig. 4, and the stroke of the front part 29 of the armature at the center of the pole plate is a. and furthermore the previously mentioned distance between the back edge of the armature and the plate 22 is d, the back edge of the armature will lift from the plane IS a distance when the armature is released. If here the normal values of (1:03 mm. and a=0.7 mm. and 1:70 mm. are used X will be equal to 0.0003 mm. This shows that an extremely small clearance will be obtained between the armature surface and the plane I2 of the core onrelease.

I claim:

In an electromagnetic relay, in combination, a core having a winding-receiving portion and a Wider end section having a plane area substantially parallel to the axis of said portion, an armature :having a section extending alongside the said portion of the core and .a flat part adapted to rest throughout a large area on the core plane area adjacent the said portion when the armature is attracted, said part being of such lateral width as to overhang the sides of said plane area, a plate of magnetic material secured to and contacting a large portion of said plane area beyond the armature part, similarly overhanging the sides of said area and having an edge substantially engaging the rear edge of the :armature part throughout most of its Width, a :normally flat spring secured to the overhanging areas of said part and plate on the sides thereof :facing the core and an integral hook on said plate closel-y overhanging said armature part and withsaid substantially engaging edges :servsing to prevent such accidental displacement of the armature as might damage the spring.

' ANDERS ossI-AN J6RGENSEN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date "923,949 Croft June 8, 1909 1,274,874 Grabe Aug. 6, 1918 1,946,261 Zupa Feb. 6, 1934 10 1,991,210 Henderson Feb. '12, 1935 11,994,671 Slawik Mar. 19, 1935 2,294,327 Zupa Aug. 25, 1942 2,321,834 Marco June 15, 1943 2391,222 .Blattner Dec. 18, 1945 15 2,421,642 Obzarny June 3, 1947 2,455,690 Matthias Dec. 7, 1948 FOREIGN PATENTS Number Country Date 751,402 France May 26, 1932