Improvements in the Construction of Holders for Incandescent Lamps.
Year: 1887

page_text: Date of Application, 19th Aug., 1837
Specification Accepted, 7th Oct., 1887.
Improvements in the Construction of Holders for Incandescent
Lamps.
We, CHARLES MARK DORMAN of 24, Brazenose Street, Manchester, in the County
of Lancaster, Electrical Engineer, and REGINALD ARTHUR SMITH of 24 Brazenose
Street, Manchester in the county of Lancaster, Electrical Engineer, 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 improvements relate to that class of holder in which the lamp is attached by
means of spring hooks, the said hooks being connected to the ends of insulated
conductors and conveying the current to and from the lamp. By our improved
method of construction it is possible to make a holder of this description entirely of
earthenware or other incombustible nonconductor of electricity and metal, which can
be screwed into position on the fitting entire and the conductors afterwards
conveniently coupled up on the front of the holder, the various metallic parts being
attached to the incombustible boss by means of screws or rivets without the use
of cement.
Referring to the drawings accompanying this specification:-Fig. 1 represents an
elevation of the holder with a lamp in position, Fig. 2 is a plan of the front of the
holder with the lamp removed. Fig. 3 is a plan of the back of the holder showing
the baseplate. Fig. 4 is a plan of the back of the holder with the baseplate and
insulating washer removed. Fig. 5 is a section of the holder through the line xx.
Fig. 6 is a section of the holder through the line y y. Fig. 7 is a section of the
holder through the line. Fig. 8 is a view of the hooked springs showing the
way in which they are attached to the bolts or studs.
a is the claw which supports the lamp, formed in one piece with the metallic
baseplate b whereby the holder is screwed on to the fitting.
c is the boss made of earthenware or other incombustible non-conductor of
electricity, having a central hole d through which the two conducting wires can be
brought to allow of their being coupled up on the front. This boss is attached to the
inetallic baseplate 6 by screws or rivets e e passing through the boss and screwed or
riveted into the baseplate b.

page_text: The conducting wires which convey the current to the holder are connected to the
hooked springs ff which support the lamp in the claw, and by which the current is
conveyed to and from the lamp by means of two small screws g g, screwed into two
metallic bolts or studs hh, the hooked springs ff being soldered or otherwise held in
contact with the bolts or studs h h at the back of the holder as shewn. It is obvious
that the springs ff may be attached to the back ends of the bolts or studs h h by
being laid round under the heads, or threaded through holes in same, or laid in
saw-gates in same, but in any case preferably soldered, and the conductors may be
attached to the front ends of the bolts or studs hh by means of small nuts screwed
on to the bolts or studs.
A washer k made of mica or other suitable material is placed in a recess made in
the back of the boss c, its object being to prevent the springs ff or the bolts or studs h h
being pushed into contact with the baseplate b.
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 lampholder of earthenware or other incombustible nonconductor of
electricity, the method of connecting the conductors to the hooked springs by means
of screws tapped into, or nuts screwed on to the outer ends of bolts or studs put
through the body of the holder, the hooked springs being soldered or otherwise held
in contact with the said bolts or nuts at the back of the boss of the holder substantially
as described and shewn.
2. The combination of a combined metallic claw and baseplate with a boss made of
earthenware or other incombustible nonconductor of electricity having a central holê
through which the conductors are brought and coupled up on the front, the boss being
attached to the baseplate by screws or rivets passing through the boss, and screwed
or riveted into the baseplate substantially as described and shewn.
3. The improved incombustible lampholder as a whole substantially as described
and shewn.
Dated thin winhtaamih
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