Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Multiple contact type
Patent
1982-04-21
1986-03-25
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Multiple contact type
335162, 335202, H01H 6302
Patent
active
045786607
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
BACKGROUND OF THE INVENTION
The present invention relates to a thin, small relay which is mounted chiefly on printed boards. Especially, the invention relates to an electromagnetic relay of the construction in which an electromagnet, having at least a core, a coil and an armature, is accommodated in a box-like insulated housing which has surrounding walls to hold terminals of fixed and moving contacts, and to a method of manufacturing the same.
FIG. 1 is a perspective view of a conventional small electromagnetic relay (hereinafter simply referred to as a relay), and FIG. 2 is a perspective view illustrating the relay of FIG. 1 in a disassembled manner. In these drawings, reference numeral 10 denotes a support member composed of an insulating material which forms a rectangular box with its upper side being open and the bottom being closed. The opposing side walls 11 of the support member 10 have through holes 12 in which terminals will be inserted. The side walls 11, further, have projections 13 for fastening a moving contact spring member on the upper surfaces thereof, and projections 15 for securing a yoke plate in the recessed portions 14. A side wall 16 has a slit or slot 17.
Reference numerals 20, 20', 21, and 21' denote fixed contact terminals, 22 and 22' denote coil terminals, and 23, 23' denote terminals for lead contacts. These terminals have at their lower ends escape-preventing pieces 24 that fold after the terminals are inserted in the through holes 12 of the side walls 11. The fixed contact terminals 20(21) and 20'(21') have a difference in height at the contact points 25. Moving contact springs, which will be mentioned later, are disposed between the contacts 25 to form transfer contacts.
Reference numeral 30 denotes an electromagnet consisting of a core 32 on which a coil 31 is wound, an L-shaped yoke plate 33, and an L-shaped armature 34. Lead wires of the coil 31 are wound on connection portions 26 of coil terminals 22, 22' and are soldered. The core 32 is fastened by caulking at one end to the yoke plate 33; the other end of the core 32 works as an attracting portion 35 to attract the armature 34. The yoke plate 33 has projections 37 with holes 36 on both sides thereof, and the armature 34 has a drive piece 38 for engaging a moving contact spring member and a projection 39 in the narrow portion thereof. Reference numeral 40 denotes a moving contact spring member having a pair of moving contact springs 41 with one end of each spring 41 being fastened to a molded member 42.
Each of the moving contact springs 41 is slightly bent. One end of each contact spring 41 has contacts 43, 43' on the front and back surfaces to come into contact with the fixed contacts 20(21) and 20'(21'), and the other end has a connection piece 45 that is directly soldered to connection portion 27 of the terminal 23 or 23' for the lead contact. A molded insulator 44 is provided at the central portion of each contact spring 41. The molded member 42 has, on both sides, holes 46 into which the projections 13 are inserted. Reference numeral 50 denotes a release leaf spring which also works to prevent the armature 34 from escaping, and which consists of an L-shaped spring piece 52 having a hole 51 in one end thereof, and insertion pieces 54 with rising portion 53, which are formed as a unitary structure. Reference numeral 60 denotes a transparent relay cover.
How the above-mentioned relay is assembled is described below. In the relay, the individual members are all mounted through the openings of the support member 10. That is, fixed contact terminals 20, 20', 21, 21', coil terminals 22 and 22', and contact lead terminals 23, 23' are inserted in the through holes 12 of the support member 10, and are secured by escape-preventing pieces 24. The electromagnet 30 is disposed in the housing with the core 32 on the lower side and the yoke plate 33 on the side of the opening, whereby projections 37 and holes 36 are fitted into the recessed portions 14 and projections 15. The armature 34 is inserted between one end
REFERENCES:
patent: 3474367 (1969-10-01), Zupa
patent: 4321569 (1982-03-01), Bernier
patent: 4346359 (1982-08-01), Pirner et al.
patent: 4398165 (1983-08-01), Iketani
English Translation of Japanese Patent No. 54-37854
Hanada Koji
Kinoshita Yuji
Tamura Masaru
Fujitsu Limited
Harris George
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