An Improved High Insulation Electric Lampholder.
Year: 1899

page_text: [The Amendments are shown in erased and italic type.
COMPLETE SPECIFICATION.
An Improved High Insulation Electric Lampholder.
FREDERICK WILLIAM HEATON and HARRY SMITH, both of Salford Switch Works,
Sidney Street, Salford, Electrical Engineers, 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 an improved method-of-fixing-terminals-in bayonet or other
slotted or screwed lampholders, as illustrated, comprising the combination of parts for
also-the method-of fixing terminals and gripping the conducting cords.
shewn a section of a cord grip suspension lampholder, with twin insulated conductors
In Fig. 1 is
cords or lead wires A affixed to their respective terminals B. These cords A pass
through the screw down collar grip (together, then separately through holes in the
insulating insulation gripping plate into their respective terminals B, which-ure
let. The terminals B are inserted into a porcelain, or any other insulating insulation
base E. Each terminal fits in separated chambers e recessed or elongated at top of
hey-hole shape for same as illustrated. The terminals B are cylindrical with binding
screws b inserted in and projecting from the side (see Fig. 6) and the chambers -e are
elongated at the top to receive the heads of the binding screws b to maintain the terminals
in position.
In Fig. 2 is shewn plan & side view of the loose disc grip D which holds the
terminals B up in their correct position in the chambers e in base E. The suspension
wires A are gripped between by the top screwed collar C binding the-conducting-wires
on-the-grip-viz. and the loose disc 1) (Fig. 2) which-also-grips-the-eord and again
between the loose disc D and on the base E as illustrated in Fig. 1.
shewn plan of insulating base E with plunger terminals B in position, with the con-
In Fig. 3 is
ductor pinching screws sunk in chambers with elongated recess which leaves a
porcelain or insulated wall dividing them.
The elongated recess as illustrated in section Fig. 1 engages the binding screw b
and prevents the terminals from falling through. The loose dise D grip Fig. 2, also
prevents the terminals from being raised moving, viz., when affixing lamp.
In Figure 4 is shewn a side view & plan of the insulator insulating base E with
spring plungers B projecting. Shewing the chambers e therejor also recesses on outer
sides which slide over projections on inside of lampholder tube, which sets set the
plungers in their correct position for making contact with lamp. In Fig. 5 is shewn
cord grip lampholder external view, shewing screwed collar C which acts as insulator
cord gripper-also metal cover F (in which gripper C screws) with clamping
ut which holds insulator & bayonet slotted tube G in position.
crewed shade holding nut H.
Also the
In Fig. 6 is shewn plans of cylindrical spring plunger terminals B, shewing surina

page_text: plunger spring contact end, and also connection connecting end shewing with hole for
conductor cord or wire A and pinching screw to bind same.
The terminal B is also shewn longitudinal with spring plunger spring out & case in
which the same slides is (shewn in Fig. 1. in section).
The method insulator we shew of for insulating and fixing terminals in socket
lampholders, applies to all socket lampholders either cord grip or screwed to suit
fittings.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we wish it to be understood
that we do not claim separate holes or sinkings in a porcelain or insulating block
but we declare that what we claim is-
1. In an electric lampholder the combination of a loose disc gripping plate_D
provided with two holes through which the wires A pass an insulating base E provided
with chambers e recessed or elongated at the upper side to engage the binding screws b
and prevent the terminals falling through and cylindrical spring plunger terminals B
which fit into the recesses e and are maintained in position in one direction by the
binding screws b in the elongated top of the chambers e and in the other direction by
the loose gripping plate D which also grips the wires A between it and the base E
substantially as described and shown.
2. An electric lampholder having the several parts constructed and arranged in
combination substantially as and for the purposes described and shown.
(4) An-improved-method-of-fixing the terminals, in un electrie--lampholder--as
described-and-illustrated.
(2) In-au-improved-electric-lampholder the method of isolating & insulating
the-terminals-substantially-as-hereinbefore-described:
(3) An-improved arrangement for gripping the twin-conductors--of-suspension
lampholders, substantially-as-hereinbefore-described.
(4) An-improved-method-of-inenluating & affixing-the-terminals-in-lampholders-as
hereinbefore-described-&-illustrated.
Dated this 4th day of May 1800
F. W. HEATON.
'H. SMITH.