Improvements relating to Means for Connecting Glow Lamps to their Holders and for Connecting Together the Parts of other Electrical Apparatus.
Year: 1890

page_text: Date of Application, 15th Sept., 1890
Complete Sp:cification Left, 12th June, 1891-Accepted, 18th July, 1891
PROVISIONAL SPECIFICATION.
Improvements relating to Means for Connecting Glow Lamps to
their Holders and for Connecting Together the Parts of other
Electrical Apparatus.
We, HEINRICH JULIUS FERDINAND VOIGT and JACOB STAUDT, trading as
Staudt & Voigt, of Bockenheim, near Frankfort-on-the-Main, in the Empire of
Germany, Manufacturers of Electrical Apparatus, do hereby declare the nature of
this invention to be as follows:-
Our invention relates to that kind of electrical apparatus having parts connected
together by screwing one part into the other.
In practice it has been found that when two parts, say for example, a glow
lamp and its holder, are connected as above stated, the parts are liable to
become accidentally unscrewed, and the object of our invention is to remedy this
defect.
In carrying out our invention we mill the screw-thread of either the base of the
glow lamp or socket of the holder and provide the part, the screw-thread of which
is not milled, with a spring-catch or spring-catches adapted to engage with the
milling on the screw-thread, so that while the catch or catches will allow the parts
to be screwed together they will prevent the parts from accidentally becoming
unscrewed.
Dated the 15th day of September 1890.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements relating to Means for Connecting Glow Lamps to
their Holders and for Connecting Together the Parts of other
Electrical Apparatus.
We, HEINRICH JULIUS FERDINAND VOIGT and JACOB STAUDT, trading as
Staudt & Voigt, of Bockenheim, near Frankfort-on-the-Main, in the Empire of
Germany, Manufacturers of Electrical Apparatus, 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:-
Our invention relates to that kind of clectrical apparatus having parts connected
together by screwing one part into the other.
In practice it has been found that when two parts, say for example, a glow lamp
and its holder, are connected as above stated the parts are liable to become
accidentally unscrewed, and the object of our invention is to remedy this defect.
In carrying out our invention we provide one of the parts to be connected with
a milling and the other part with one or more spring-catches or notches or
indentations adapted to engage with the said milling so that while allowing
the parts to be screwed together they will be prevented from accidentally becoming
unscrewed.
To enable our invention to be fully understood we will describe how it can be
carried into practice by reference to the accompanying drawing which illustrates
the application of our improvements to the connection of the base of a glow lamp
with the socket of its holder.
Figure I is an elevation of the base of a glow lamp having its screw-thread a
milled.

page_text: Figure 1 is a horizontal section; and,
of the
Figure III is a vertical section of the socket of the lamp holder having a spring-
tongue cut out of the female screw 6 of the socket g, the said tongue being formed
with an indentation or tooth which engages in the milling a on the base
lamp and, whilst allowing the base f to be screwed into and out of the socket g,
prevents the parts from becoming unscrewed through vibration or shocks.
Figures IV and V are similar views to Figures II and I respectively but
shewing the bottom of the socket 9 provided with a milled stud c in which engages
a spring on the lamp-base f
Figure VI which is an elevation of the base of an Edison lamp connected to its
socket; and,
Figure VII which is an elevation of the base of the said lamp shew the insu-
lating ring e of the socket 9 milled to engage with springs d d fixed to the
base f.
Or, as shewn in Figures VIII and IX, which are respectively an elevation and
a horizontal section of a lamp socket, a notch or indentation 2 can be formed in
the thread, which is made of sheet metal so that it will possess a certain clasticity
and cause the notch or indentation to engage with a milling upon the thread of the
lamp-base.
In the horizontal section at Figure X the part of the connection on which the
female thread is formed is supposed to be a casting. In this case, instead of
securing it by spring-tongues or notches 2, the holder or nut is cut away at m
and a spring bent so as to form a nose 3 is fixed by screws on the outside.
This nose protrudes through the opening m so that, when screwing the parts
together, it engages in the milling a of the screw-thread on the lamp-base, Figure 1,
and prevents it coming unscrewed except when it is turned by hand.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :
1. The means for connecting together the parts of electrical apparatus,
consisting in providing one of the parts to be connected with a milling and the
other part with one or more spring-catches, notches, or indentations engaging
with the said milling, substantially as, and for the purpose, herein before
described.
2. The improved glow-lamps and holders herein before described with reference
to the accompanying drawing.
2007
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.