Geometrical instruments
Patent
1978-09-21
1980-04-15
McGlynn, Joseph H.
Geometrical instruments
339 50R, H01R 1102
Patent
active
041981120
ABSTRACT:
A male screw base for a lampholder fitting has a cylindrical insulative body having a helical groove in its exterior surface, in which a helical spring is loosely disposed. Both ends of the helical spring are bent inwards and protrude through a slot at either end of the groove to extend into a hollow interior of the body. The inside diameter of the spring is spaced from the bottom surface of the groove a distance equal to the thread depth of the female threads of an Edison-based lampholder. The bent ends of the spring are normally in contact with the near ends of their respective slots, whereby excessive installation torque will wind up the spring, reducing its diameter a sufficient distance to become disengaged from the lampholder thread grooves. A conductor is connected to one of the spring ends, and a second conductor is provided as a center contact coaxially extending from one end of the cylindrical body. The end of the body opposite the center connector is adapted for attachment to a lampholder fitting. In one preferred embodiment a ring-shaped third electrical contact is coaxially spaced from the center contact.
REFERENCES:
patent: 808096 (1905-12-01), Lawrence, Jr.
patent: 2972125 (1961-02-01), Temple et al.
patent: 3644867 (1972-02-01), Krause
LandOfFree
Torque limited male screw base for lampholder fitting does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Torque limited male screw base for lampholder fitting, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Torque limited male screw base for lampholder fitting will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-473359