US1671540A

US1671540A - Method of manufacturing electric contact plugs

Info

Publication number: US1671540A
Application number: US77145A
Authority: US
Inventors: Monteil Bertrand
Original assignee: Delta Co
Current assignee: Delta Co
Priority date: 1925-07-31
Filing date: 1925-12-22
Publication date: 1928-05-29
Anticipated expiration: 1945-05-29
Also published as: CH114780A

Description

May 29. 1928. I 1571,50

B. MONTEIL METHOP OF MANUFACTURING ELECTRIC CONTACT PLUGS Fild Dec. 22, 1925 Patented May 29, 1928.

UNITED. STATES PATENT OFFICE.

BERTBAND MONTEIL, OI SOLEURE, SWITZERLAND, ASSIGNOB TO DELTA 00., 0F

. SOLEURE, SWITZERLAND.

' METHOD OF MANUFACTURING ELECTRIC CONTACT PLUGS.

Application filed December 22, 1925, Serial No. 77,145, and in Switzerland July 31, 1925.

Contact plugs for cylindrical sockets have been knownheretofore having male parts formed of a tube the walls of which are separated by longitudinally extended radial slots into narrow lamellae hanging together at their ends. In shaping these plugs the fore ends of the metal shanks were contracted on a press and then the lamellea were bulged out by an axial thrust. Th1s process was employed whether a regulartube was used or whether a solid rod was bored out either part1 or on its whole length so as to form a to e before separatmg the lamellae.

The object of the present invention is a process for manufacturing contact-plugs for c lindrical sockets characterized in that the t ickness of the lamellae is determined by a boring extended from the back end unto nearly the fore end of the plug. In this.

way it is possible to produce without any contracting operation, plugs having lamellae hanging together and having a fore end of any desired shape, which shape may be 1ven previously on the lathe and be that est suited for a good contact. The thrustlng operation is eliminated and the mechanical operations are greatly simplified and cheapened.

It must be mentioned here, that for currents of greater intensit conical plugs fitting into conical sockets ave been proposed. In this case with the view of obtaining a resilient contact both plug and socket were also provided with longitudinally extended radial slots but the diameter of the corresponding socket had to be chosenvery exact because if the diameter of the socket dld not fit rather closely a bad contact would be the result. With plugs according to the present invention however the diameters of the corresponding sockets may vary within certain limitsw-ithout impairing the contact and therefore such plugs are better suited in cases where sockets and plugs are, of different origin.

Therefore and according to the present invention the method of manufacturing electrical contact plugs appertaining to cylindical sockets and having a plurality of resilient arcuated narrow plates separated by radial slots but still cohering at their'fore ends consists of forming-the same out of a solid blank by first turning the outside of Fig. 1 is a plug for powerful electric currents.

'This plug has been obtained of solid brass wire. A'fter havin shaped the outside of the plug on the lathe by giving a predetermined curving to the contact portions 6 and to the fore-end c and after having made the thread (i a hole is drilled almost on the whole length of the plug said hole beginning at the rear end that is at the socket a and extending close up to the fore end a.

After forming lamellae by means of slots 6, 1n my case six, a prop f having the hole 9 for introducing the wires and provided with the thread for a set screw his forced into the socket end. The plug presents therefor a hollow space enclosed by the lamellae which are hanging together at their both ends. There is no tension whatever in the metal so that the outside shape of a number of plugs is perfectly alike whlch is not'the case with plugs obtained by the. thrust process.

Fig.2 represents a second working form of the plug. The general shape of the contact portion that is of the hollow space enclosed by the lamellae is exactly the same as in Fig; 1. The base of this plug however is threaded at z' and is screwed into a socket is which is provided with an axial hole for the wire. Also in this plug the bore on which the thickness and the resilience of the lamelle'e is depending is extended from the rear to the fore end close up to the point 0.-

.The plug represented in Fig. 3 is especially suited for radio plants and is mostly embedded in radio lamp sockets. The bore as in the first two figures is likewise begun at the base a and extended to the point a. No prop is needed here.

The plug represented in Fig.4 is distinguishied from that in Fig; 3in that it has a forming the same out of asolid blank by I perforation Z at the point into which awire first turning the outside of the blank to form may be introduced and soldered fast. same arcuate, then boring an axial hole up Having thus described my 1nvent1on,'wl iat to an end of said blank for determinin 5 I claim is: thickness of lamellae to be formed and .gnal- {6 In manufacturi g electrical contact plugs 1y cutting longitudinal extending radial appertaining to c llndrica-l sockets and havslots to form lamellae. ing a plurality o resilient arcuated narrow In testimony whereof I aflix my signature. plates separated by radial slots but still 00- 10 hering at their fore ends, the method of BERTRAND MONTEIL.