Improvements in Holders or Supports for Incandescence Electric Lamps.
Year: 1891

page_text: Date of Application, 20th Mar., 1891
Complete Specification Left, 26th Nov, 1891-Accepted, 2nd Jan., 1892
PROVISIONAL SPECIFICATION.
Improvements in Holders or Supports for Incandescence Electric
Lamps.
I, JAMES YATE JOHNSON of 47 Lincoln's Inn Fields in the County of
Middlesex, Gentleman, do hereby declare the nature of this invention which has
been communicated to me from abroad by Theodore Mace of the Vitrite Works
Middelburg in the Kingdom of Holland Manufacturer to be as follows:-
:-
This invention has for its object to provide holders or supports for incandescence
electric lamps wherein metallic parts are encased or enclosed in such a manner as
to be protected from corrosive gases, damp or other agents which would be liable to
injure them. These holders or supports therefore are suited for use in chemical
works, coal bunks, flour mills or mines or in exposed or damp places.
According to this invention the barrel or body part of the holder or support is
made of vitrite or other material not liable to be injuriously acted upon by corrosive
gases or by damp. The contacts between the lamp and the holder and support and
the connections with the external wires are made inside the said barrel or body
part which is closed in so as to prevent access of gases, water or other deleterious
matter. This may be effected in the following manner although I do not limit
myself to the precise details which I shall describe.
The barrel or body part is divided by a transverse partition into two compart-
ments through which pass conducting rods one end of the rods projecting into one
compartment and the other ends projecting into the other compartment. The
terminal спр on the lamp bulb is inserted into the one compartment so as to make
contact with the ends of the rods in that compartment preferably with the inter-
vention of springs pressing upon the terminal plates of the cap, the connection of
the cap and barrel or body part being preferably made by projections on the one
engaging in grooves in the other after the manner of a bayonet-joint fastening. A
packing ring of rubber asbestos or the like may be pinched between the cap and
the barrel or body part to ensure a tight joint. The other compartment of the
barrel or body part is preferably closed by a plate or filling piece with holes in it
for the admission of the insulated lead wires or insulated wires to be connected to
the lead wires. These wires are bared at the ends which enter the compartment and
are soldered onto or into the ends of the rods which project into this compartment
or are electrically connected therewith in any other suitable way such for example
as by soldering the ends of the wires to metal pieces placed over the ends of the
rods and secured by nuts. The space in this chamber inay be filled with plaster of
paris or other cement or filling. The barrel or body part may be of any suitable
shape and for convenience of setting the holder in a stand clamp or bracket it may
have a central annular rib around it.
Dated 20th March 1901
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C., Agents.

page_text: COMPLETE SPECIFICATION.
Improvements in Holders or Supports for Incandescence Electric
Lamps.
I, JAMES YATE JOHNSON of 47 Lincoln's Inn Fields, in the County of
Middlesex, Gentleman, do hereby declare the nature of this invention (which
has been communicated to me from abroad by Theodore Mace of the Vitrite
Works, Middelburg, in the Kingdom of Holland, Manufacturer, 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 has for its object to provide holders, or supports, for incandescence
electric lamps wherein metallic parts are encased, or enclosed, in such a manner as
to be protected from corrosive gases, damp, or other agents, which would be liable
to injure them. These holders, or supports, therefore are suited for use in chemical
works, coal bunks, flour mills, or mines, or in exposed, or damp places.
According to this invention the barrel, or body part, of the holder, or support, is
made of vitrite, or other material not liable to be injuriously acted upon by corrosive
gases, or by damp. The contacts between the lamp and the holder, or support, and
the connections with the external wires, are made inside the said barrel, or body-
part, which is closed in so as to prevent access of gases, water, or other deleterious
matter. This may be effected in the manner which I shall now describe with
reference to the accompanying drawings, although I do not limit myself to the
precise details shewn in the drawings.
Figure 1 is a vertical section of a holder, or support, with the parts engaged
together.
Figures 2 and 3 shew the parts separated.
The barrel, or body-part, A, is made of vitrite, or like material, as hereinbefore
explained, and is divided, by a transverse partition, a, into two compartments a', a²,
and through this partition conducting rods b, are passed, one end of the said rods
projecting into one compartment (a), and the other ends projecting into the other
compartment (a). The terminal cap C, on the lamp bulb is inserted into the com-
partment a', so as to make contact with the ends of the rods b, in that compartment,
preferably with the intervention of springs b, pressing upon the terminal plates c,
of the cap, the connection of the cap C, and barrel, or body-part, A, being
preferably made by projections, or pins, the pins (as at d) on the one engaging in
grooves (as at f), in the other after the manner of a bayonet-joint fastening. A
packing ring G, of rubber, asbestos, or the like, may be pinched between the cap C,
and the barrel, or body-part, A, to ensure a tight joint. The compartment a', of
the barrel, or body-part, A, is preferably closed by a plate, or filling, with holes in
it for the admission of the insulated lend-wires h, or of insulated wires to be
connected to the lead wires. These wires are bared at the ends which enter the
compartment a', and are soldered onto, or into, the ends of the rods b, which project
into this compartment, or are electrically connected therewith in any other suitable
way; such, for example, as by soldering the ends of the wires to metal pieces
placed over the ends of the rods and secured by nuts. The space in the compart-
ment a, may be filled with plaster of paris, or other cement, or filling preferably
by a plug of "vitrite" with openings in its sides for the passage of the conductors
and held in place by plaster of paris or other cement. The barrel, or body-part, A,
may be of any suitable shape and for convenience of setting the holder in a stand,
clamp, or bracket, it may have a central annular rib, as at a³, around it.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is :-
:-
1 A holder or support for incandescence electric lamun having the metallic

page_text: parts enclosed in vitrite, or like substance; not injuriously acted upon by corrosive,
or chemical action; substantially as hereinbefore described.
2. In holders, or supports, for incandescence electric lamps, forming the connection
of the leads with the conductive portions to the lamp in a chamber which is
covered in, or filled with, a protective cover, or filler, substantially as hereinbefore
described.
3. The arrangement and combination of parts constituting the holder, or support,
for incandescence electric lamps substantially as hereinbefore described, and shewn
in the accompanying drawings.
Dadhi nesh dor of Vomba 1801
J. H. JOHNSON & Co.,
Agents.