Improvements in Devices for Securing Incandescent Electric Lamps in their Sockets.
Year: 1899

page_text: Date of Application, 5th June, 1899-Accepted, 28th Oct., 1899
COMPLETE SPECIFICATION:
Improvements in Devices for Securing Incandescent Electric Lamps
in their Sockets.
I, WILHELM RAVENÉ, of No. 2c, Chaussee Strasse, in the City of Berlin, in
the German Empire, Director, do hereby declare the nature of this invention
and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :-
The subject of the present invention is a device for securing electric incan-
descent lamps in their sockets, and has reference to such bulbs as are not per-
manently fixed at the terminal with cement, but are easily removable.
The invention consists in using the glass bulb directly as bearing for the ends
of the incandescent filament, in such manner that these ends cannot change their
relative position to one another in transport or in installation work. The glass
bulb is protected from injury by being fixed by means of spring pins telescoping
into each other and pushing claws or hooks into depressions in the terminal
portion of the lamp bulb.
The accompanying drawing shows one form of carrying out the invention.
Fig. 1 is a side elevation and
Fig. 2 a vertical section of the socket with lamp in position.
Fig. 3 is a plan view of the socket with the bulb removed.
Fig. 4 shows the glass bulb alone, and
Fig. 5 shows the bottom portion of the same turned through an angle of 90°.
The bulb itself at its pointed end is provided with two depressions A situated
opposite to each other, the bases of these depressions in the inside nearly touching
one another, (Fig. 5). The filament is so placed in the body of the bulb that the
soldered terminals which pass through the bulb and form knobs tie one on each
side of the internal projections formed by the depressions A. In this manner
the filament is prevented from coming in contact with each other in transport or
installation work.
a are two hooks or claws which engage in the depressions A. They are
attached to lever arms and are borne against the inside of the depressions by a
spring b. These claws are operated by two pins ce, one of which passes into
the other. Each pin has a catch or against which the ends of the claw
lever bear. When, therefore, the pins c c are pushed or pressed together, the
catches d d press the lever ends towards each other and thus open the claws a a.
Contact with the main leads is made by means of two plates f held to a vulcanite
plate o, which plates f by means of two springs are pressed upwards against
the soldered terminals projecting through the glass bulb. The contact plates f
are held in position by means of screws h, which pass downwards to the contact
plates i, where the leads are attached.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is:-
1. A device for securing incandescent electric lamps in their sockets without
the use of cement, consisting of two claw levers (a a), the claws of which envaca

page_text: in depressions (A A) in the neck of the lamp bulb, and are retained there by
spring pressure, and two spring, pins (cc) passing one into the other, which
on being pressed together operate the lower ends of the claw levers and open
the claws; the said depressions (A A) forming projections on the inner surface
of the lamp bulb of such height as to effectually hold the filament terminals
apart; in combination with suitable means of electrically connecting the terminals
of the lamp with the leads, all substantially as described.
2. An incandescent electric lamp for use with a device as claimed in Claim 1,
consisting of a glass bulb through which the terminal wires protrude, said wires
being provided with metallic knobs, which tie firmly and directly against the
glass of the bulb, substantially as described.
Dated this 5th day of June 1899.