Year: 1898

page_text: 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:
Our invention, which relates to holders for incandescent electric lamps, has
for its object to obtain greater simplicity in construction, and more perfect in-
sulation as now required for high voltage currents; and in description of the
peculiar construction which is the subject of our invention, we propose to call this
holder the "cul-de-sac" holder.
The invention consists in making the "interior" or insulator part, of a block
of insulating material having formed in it two cavities or tunnels going nearly,
but not quite through the block, each having an opening to the opposite side of
the insulating block. In each of these cavities or tunnels there is in the top or
roof part a circular hole through which the plunger piece can pass and in the
bottom or floor portion of the cavities or tunnels there is a hole through which the
wire passes into the plunger block, which is secured by the usual setting screw.
The plunger block is made of a rectangular shape so as to fit the sides of the
cavity or tunnel, and contains the usual plunger piece, the hole for the wire to
pass through, and the setting screw.
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This complete rectangular piece is pushed into the cavity or tunnel by pressing
down the plunger" and being pushed to the end of the cavity or tunnel the
plunger" rises through the hole prepared for it, and the hole in the "plunger
block for the wire comes into position over the hole in the bottom of the cavity or
tunnel prepared for the wire to pass into it.
Some portion of the metal at the top of the rectangular piece immediately over
the hole through which the wire enters, is removed in order to make a space
for the accumulation of any loose wire which may be pushed through in wiring
the holder.
By this invention it will be seen that the insulating block completely covers
the plunger pieces excepting at the two holes through which the two plungers
rise, whilst the entrance to the two cavities gives the required means for screwing
up the setting screws for securing the leading-in-wires.
Dated this 30th day of March 1898.
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents,
int Vincent Street, Glasgow, Agent. for the Applicants.

page_text: 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
performed to be particularly described and ascertained in and by the following
statement:
This invention relates to holders for incandescent electric lamps which while
simple in construction, affords good insulation such as is required when currents of
high tension are employed.
The accompanying drawings illustrate a holder according to this invention,
these being drawn to an enlarged scale so as to shew the parts more clearly.
Fig. 1 is a vertical section of the metal casing shewing in elevation the
insulating base within it.
Fig. 2 is a sectional plan of the insulating base.
Fig. 3 is a section of the socket for the spring plunger.
Fig. 4 is a vertical section on the line X X of Fig. 2 shewing the plunger
socket in the act of being introduced into the base.
The casing A of the usual construction contains the base B made of ceramic or
other suitable insulating material.
In the base are formed two rectangular recesses to receive the sockets C of the
spring contact plungers.
Each socket has through it a hole to receive the conducting wire and a setting
screw S for clamping the wire. The base has in each of its recesses a hole H on
the lower side, through which the plunger projects, and a hole D on its upper side,
coinciding with the wire hole in the socket.
For introducing the sockets C into the recess of the base the plunger pushed
in till its face is level with the face of the socket as shewn in Fig. 4, and the
socket being then pushed into the recess, the plunger on reaching the hole H
springs out, retaining the socket in its place.
The conducting wire can then be passed through the hole D of the base into the
hole of the socket and secured by the screw S, and the base can then be enclosed
in its casing A. When it is desired to withdraw the socket, the plunger has to be
pushed in while the socket is being subjected to the outward pull.
The recesses might be carried quite through the base but it is preferred to have
them open at one end only as shewn, as the base is less weakened.
It will be seen that by the construction shewn there is good insulation of the
metallic parts, and that there is no fixing by screws in the insulating material.
Having now particularly described and ascertained the nature of this
invention and in what manner the same is to be performed, we declare that what
we claim is:-
A holder for an incandescent electric lamp constructed substantially as described
with reference to the drawings.
Dated this 9th day of May. 1898.