Improvements in Key Switch Holders for Incandescent Electric Lamps.
Year: 1897

page_text: Date of Application, 20th Dec., 1897
Contato Connifinction Loft 8th Sent 1898 Accented 17th Dec. 1898
PROVISIONAL SPECIFICATION.
Improvements in Key Switch Holders for Incandescent Electric
Lamps.
We, JAN MEINES HUISMAN and HENRY CHARLES GOVER, both of Mansfield,
13, Leigham Vale, Streatham, in the County of Surrey, Gentlemen, do hereby
declare the nature of this invention to be as follows:-
:-
This invention has for its object principally the provision of a more simple
combination of parts than those at present in use in key holders, and the more
perfect insulation of the several parts adapting the holder to currents of high
voltage as now required.
The invention is illustrated by the accompanying drawings, Figures 1 and 2 of
which are respectively a vertical section and plan of the improved holder.
Figure 3 is
vertical section and Figure 4 a plan of that portion of the lamp
holder which carries the contact devices; Figures 5 and 6, and 7 and 8, are re
spectively plans and elevations of the parts of the holder which contain the contact
devices and Figures 9 and 10 are respectively side and sectional elevations of the
contact making and breaking devices.
The holder consists as usual of a brass case A, as shown at Figures 1 and 2
of the drawings, into which fits an insulated piece made in two portions B, B',
and composed of porcelain or other insulating material.
In the portion B of the insulated piece is fitted one of the usual contact making
plungers C with a tongue piece C₁ projecting through at one side of the piece B.
This plunger C is kept in position by a pin entered through the side of the piece B¹.
In the portion B₁ of the insulated piece is fitted the other plunger D which is
kept in position by the wire binding screw E, as shewn on the drawings. The
wire F in this case passes into the centre of the plunger D.
In the portion B₁ of the insulated piece is also fitted a bracket G of the form
shewn at Figures 9 and 10 said bracket carrying a block H in which the wire I
is gripped by a binding screw J. A short spindle K carrying a switch piece L
preferably insulated on the face and a square or like shaped head M which is held
in position by a spring N secured to the bracket G the spindle passing outside
the case and having an insulated finger piece or key O. The bracket G fits into
a cavity B2 in the insulated piece B₁ as shewn at Figure 3 without being secured
thereto and on the key O being turned the switch piece L on the spindle K is
brought into contact with the tongue piece C¹ of the plunger C thereby making
contact and giving free passage for the current from the wire F to the lamp and
thence by way of the plunger C, tongue C¹ and switch piece L to the wire P.
1
1907
WALLACE FAIRWEATHER.
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents,
62, Saint Vincent Street, Glasgow.
Agent for the Applicants.

page_text: Improvements in Key Switch Holders for Incandescent Electric
Lamps.
We, JAN MEINES HUISMAN and HENRY CHARLES GOVER, both of Mansfield,
13, Leigham Vale, Streatham, in the County of Surrey, Gentlemen, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
This invention has for its object principally the provision of a more simple
combination of parts than those at present in use in key holders, and the more
perfect insulation of the several parts adapting the holder to currents of high
voltage as now required.
Referring to the drawings filed with the Provisional Specification, Figures 1
and 2 are respectively a vertical section and plan of the improved holder. Figure 3
is a vertical section and Figure 4 a plan of that portion of the lamp holder which
carries the contact devices; Figures 5 and 6, and 7 and 8, are respectively plans
and elevations of the parts of the holder which contain the contact devices, and
Figures 9 and 10 are respectively side and sectional elevations of the contact
making and breaking devices.
The holder consists as is usual of a brass case A, as shown at Figures 1 and 2
of the drawings, into which fits an insulated piece made in two portions B, B,
and composed of porcelain or other insulating material.
In the portion B of the insulated piece is fitted one of the usual contact making
plungers C with a tongue piece C¹ projecting through at one side of the piece B.
This plunger C is kept in position by a pin entered through the side of the piece B.
In the portion B' of the insulated piece is fitted the other plunger D) which is
kept in position by the wire binding screw E, as shown on the drawings. The
wire F in this case passes into the centre of the plunger D.
In the portion B₁ of the insulated piece is also fitted a bracket G of the form
shown at Figures 9 and 10 said bracket carrying a block H into which the wire I
is gripped by a binding screw J. A short spindle K carrying a switch piece L
preferably insulated on the face is carried in a bracket G and a square or like
shaped head M held in position by a spring N is secured on the spindle K, the
spindle passing outside the case and having an insulated finger piece or key 0.
The bracket G fits into a cavity B³ in the insulated piece B¹ as shown at Figure 3
without being secured thereto and on the key O being turned the switch piece L
on the spindle K is brought into contact with the tongue piece C₁ of the plunger C
thereby making contact and giving free passage for the current from the wire F
to the lamp and thence by way of the plunger C, tongue C¹ and switch piece L to
the wire I.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is:-
-
1. In a socket or holder for incandescent electric lamps the arrangement of
parts substantially as described with reference to Figures 1 to 10 inclusive.
2. In a socket or holder for incandescent electric lamps the combination of two
spring pistons or pins, a circuit closing device, and contact screws enclosed or em-
bedded in a porcelain or other insulating block or base substantially as described.
3. In a socket or holder for incandescent electric lamps the employment of a
block of porcelain or other insulating material divided in such a manner as to

page_text: completely enclose the contact breaker and all working parts except the spring
pistons, and to which and in which all the said working parts are fixed sub-
stantially as hereinbefore described.
Dated this 7th
1000
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents,
62, Saint Vincent Street, Glasgow,
Agent for the Applicants.
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents,
62, Saint Vincent Street, Glasgow,
Agent for the Applicants.