Electrical connectors – Having circuit interrupting provision effected by mating or...
Patent
1990-11-16
1991-07-09
Abrams, Neil
Electrical connectors
Having circuit interrupting provision effected by mating or...
200 5109, H01R 2900
Patent
active
050301241
DESCRIPTION:
BRIEF SUMMARY
It is of extreme importance that such electric mass products as holders for electric glow lamps are of such design that the hazard the user is exposed to when using them is as small as possible. This hazard should preferably be completely non-existent since a very great number of users of holders for electric lamps are not aware of or appreciate only vaguely the potential risks associated with holders for high-tension current lamps.
There is, in fact, no lamp-holder on the market that is completely free from risks for the user. Thus, as far as is known, in all types of lamp-holders it is possible to introduce an elongated object of conductive material into a lamp-holder having no lamp screwed into it, press a contact or contact holder and thus close a circuit which includes the elongated object.
The invention thus has for its purpose the provision of a holder for high-tension current lamps of a structure precluding the above hazardous procedure so that the lamp-holder according to the invention can be characterized as a safe a high-tension lamp-holder as can possibly be made.
This purpose is attained by a lamp-holder according to the claims.
The invention will be explained in detail below and with reference to the attached drawings, wherein
FIG. 1 represents a central vertical section through an embodiment of the lamp-holder according to the invention, and
FIG. 2 a central vertical section through the lamp-holder of FIG. 1 with the plane of section being at right angles to the plane of section of FIG. 1.
The embodiment of the lamp-holder according to the invention shown in the Figures of the drawings comprises a conventional, substantially cylindrical housing 1 consisting, with respect to a lamp screwed into it, of an inner portion 1a having a central aperture 2 at the inner end thereof and a conventional arrangement associated therewith for receiving and fixing a two-wire electric conductor 3, and an outer portion 1b threaded to the inner portion 1a and open at its outer end to permit insertion of a bulb into the holder with its threaded base. The housing is manufactured from a non-conductive material.
In housing 1 there is provided a yoke 4 which is inserted into housing 1 before the two portions 1a, 1b thereof are screwed together. Yoke 4 is also made from a non-conductive material and has at its outer end a female thread 5 for the thread of a base. From the portion of yoke 4 which is provided with thread 5 a pair of diametrically opposed yoke legs 4a, 4b extend inwardly. Each one of these has, on the radially outer side thereof and about midway between the outer and inner end of yoke 4, a circular projection 6 of a preferably rectangular cross section and accomodated with ample clearance radially as well as axially in a circular groove or recess 7 in the interior wall of housing 1 and formed by a notch at the inner end of housing portion 1b and the outer edge of housing portion 1a. The axial clearance of projections 6 preferably is in all of the order of two or three millimeters.
Each leg 4a, 4b of yoke 4 is provided with an interior face groove 8, adjacent the inner ends thereof and preferably of rectangular cross section, grooves 8 being mutually opposed in the legs and adapted to receive projections 10 provided at mutually opposed edges of a plate 9 and having a shape in cross section corresponding to that of grooves 8 and dimensioned to be insertable with a close fit into grooves 8. Plate 9 is manufactured from a non-conductive material.
Plate 9 is provided with a couple of through holes 11 located on either side of the centre thereof and lined in a conventional manner by sleeves 13 of a conductive material provided at the tops thereof with contacts 12 of a conductive material. The ends of the separated and from insulating material stripped end portions of electric conductor 3, are inserted into sleeves 13 and fixed in a conventional manner. These ends carry plates 9 and hence yoke 4.
Plate 9 carries on the outer face thereof a relatively short compression spring 14 which is concentric with the ver
REFERENCES:
patent: 2439385 (1948-04-01), Goldberg
patent: 3895195 (1975-07-01), Morrison et al.
patent: 3915536 (1975-10-01), Glantz
patent: 4513182 (1985-04-01), Juntti
Abrams Neil
El-Akta System AB
Nguyen Khiem
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