Year: 1887

page_text: Date of Application, 9th Apr., 1887
Complete Left, 7th Jan., 1888
Complete Accepted, 10th Feb., 1888
I, WILLIAM HENRY BAYLEY, of 2 Bernard Street, Walsall in the County of
Stafford, Commercial Clerk, do hereby declare the nature of this invention to be as
follows:
This invention relates to holders in which terminal plates on the lamps press against
the ends of contact pins carried by the holders, and has for its object to facilitate the
wiring of the holder, and to ensure a thorough contact between the terminal plates
and the contact pins aforesaid, so as to avoid any risk of firing or sparking.
In a holder constructed according to this invention the insulating material which
carries the contact pins, and the plates through which they pass or in which they are
mounted, and the binding screws for the wire attachments, is fixed within the end of
a metal case, herein after termed for distinction the "inner case." The part of this
case which carries the insulating material is of a greater diameter than the remaining.
part thereof, for a purpose which will be presently explained. An opening is formed
through the back end of this case for the passage of the leading wires, and such
opening is screwed for connection with the fixed bracket or support by which the
holder and lamp are carried. An outer case, forming part of the holder, and to
which the lamp is to be fixed by means of the ordinary bayonet joint, is made to fit
easily around the part of larger diameter of the inner case so as to be capable of
being easily slid therealong. An annular space is thus left between the outer case and
the part of smaller diameter of the inner case. The back end of the outer case is
formed with a projecting milled belt or ring by which it may be pulled down against
the pressure of a spring as hereinafter described, and such belt or ring has an inward
flange or ledge of an internal diameter which fits easily around the part of lesser
diameter of the inner case. A spiral spring, hereinafter termed the "main" spring,
is placed around the part of the inner case which is of reduced diameter and within
the annular space between such part and the outer case, and as the outer case is pulled
down around the inner case the main spring is compressed between the inward flange
or ledge of the outer case and the shoulder of the inner case. The contact pins are
capable of yielding as usual against the pressure of buffer springs, and it is preferred
to form the pins with enlarged heads and to place the buffer springs around the pins
LD
977

page_text: so that they may be compressed by the heads of the pins as the latter are forced in.
A slot is formed in the side of the outer case into which a stud fixed to the inner case
projects, and thus by the end of the slot coming in contact with the pin a point is
fixed beyond which the outer case cannot be pressed upwards by the main spring.
Previously to attaching the lamp the outer case is in its upward position with its outer
or lower end level, or approximately so, with the ends of the contact pins. To attach
the lamp it is pushed up against the contact pins, which are pressed in as usual, and
the outer case is pulled down against the pressure of the main spring until its lower
end is sufficiently below the ends of the contact pins for the attachment of the lamp
to be made with it; whereupon the lamp is turned in the usual manner to bring the
studs projecting from the collar thereof into the side grooves of the bayonet joint,
and the outer case is then released and the main spring re-acts and presses the usual
notches of the side grooves around the lower sides of the studs and thus securely holds
the lamp.
By the employment of this invention the wires are readily brought to the binding
screws and fixed thereby without taking the holder to pieces (as is necessary in the
employment of the ordinary holders) as according to this invention the binding screws
are, previously to the attachment of the lamp, near to the outer end of the outer case,
and consequently readily accessible. A sufficient tension also is given to the buffer
springs around the contact pins, by the attachment of the lamp, to ensure thorough
contact between the pins and the terminal plates of the lamp, as the whole force of
the main spring is constantly tending to draw up the lamp against the ends of the
contact pins, and thus if either or both of the buffer springs is weak the lamp is
pulled up higher towards the end of the inner case until the reaction of the buffer
springs counteracts the upward pull of the main spring.
D: 1712
1
1007
STEPHEN WATKINS,
Walsall and Wolverhampton,
Agent for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Holders for Incandescent Electric Lamps.
1, WILLIAM HENRY BAYLEY, of 2 Bernard Street, Walsall in the County of
Stafford, commercial clerk, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement, reference being had to the accompanying
drawings and the letters of reference marked thereon (that is to say) :-
:-
This invention relates to holders in which terminal plates on the lamps press against
the ends of contact pins carried by the holders, and has for its object to facilitate the
wiring of the holder, and to ensure a thorough contact between the terminal plates
and the contact pins, aforesaid, so as to avoid any risk of firing or sparking.
22
A holder constructed according to this invention is illustrated to an enlarged scale
(about double of full size) by the drawings herewith, of which figure 1 is a vertical
section of such holder, figure 2 a side elevation, and figure 3 a view of the underside.
Like letters of reference indicate corresponding parts in the different views. The
insulating material a which carries the contact pins bb and the connection plates c c
through which they pass or in which they are mounted, and the binding screws d d
for the wire attachments, is fixed within the end of a metal case A, hereinafter termed
for distinction the "inner case. The part of this case which carries the insulating
material is of a greater diameter than the remaining part thereof, as shewn, for a
purpose which will be presently explained. An opening e is formed through the
back end of this case for the passage of the leading wires, and such opening is screwed,
as shewn, for connection with the fixed bracket or support by which the holder and
lamp are carried. An outer case B forming part of the holder, and to which the lamp
is to be fixed by means of the ordinary bayonet joint consisting of pins projecting
from a collar on the lamp taking into a pair of open-ended angular slots m m², mm²,
one on each side of the outer case, is made to fit easily around the part of larger
diameter of the inner case so as to be capable of being easily slid therealong. An
annular space ff is thus left between the outer case and the part of smaller diameter
of the inner case. The back end of the outer case B is formed with a projecting
milled belt or ring g by which it may be pulled down against the pressure of a spring,
as hereinafter described, and such belt or ring has an inward flange or ledge h of an
internal diameter which fits easily around the part of lesser diameter of the inner case.
A spiral spring CC, hereinafter termed the "main" spring, is placed around the part
of the inner case which is of reduced diameter and within the annular space ff, and
as the outer case is pulled down around the inner case the main spring is compressed
between the inward flange or ledge h of the outer case and the shoulder i of the inner
case. The contact pins b b are capable of yielding, as usual, against the pressure of
powerful springs, and it is preferred to form these pins with enlarged heads 6' 6¹, as

page_text: shewn, and to place the buffer springs k k around the pins so that they may be com-
pressed by the heads of the pins as the latter are forced in. The stems of the pins
are mounted to slide through the connection plates c c and are provided with collars,
as shewn, to prevent them from being drawn out of the plates. This arrangement is
more compact and effective than those usually employed for the purpose, and is of
course applicable to the ordinary or any construction of holders in which contact pins
of a similar character are employed. A slot is formed in the side of the outer case,
and a stud fixed to the inner case projects into such slot, and thus the end of the
slot coming in contact with the pin forms a stop beyond which the outer case cannot
be pressed upwards by the main spring. Previously to attaching the lamp the outer
case is in its upward position, as shewn, with its outer or lower end level, or approxi-
mately so, with the heads of the contact pins b b. To attach the lamp it is pushed up
against the heads of the contact pins and the pins are pressed in as usual, and the
outer case is pulled down against the pressure of the main spring C C until its lower
end is sufficiently below the heads of the contact pins for the attachment of the lamp
to be made with it, whereupon the lamp is turned in the usual manner to bring the
studs projecting from the collar thereof into the side grooves m² of the bayonet joint,
and the outer case is then released and the main spring reacts and presses the notches n
of the side grooves around the lower sides of the studs and thus securely holds the
lamp.
By the employment of this invention the wires are readily brought to the binding
screws and fixed thereby without taking the holder to pieces (as is necessary in the
employment of the ordinary holders) as according to this invention the binding screws
are, previously to the attachment of the lamp, near to the outer end of the outer
case, as shewn, and consequently readily accessible. A sufficient tension also is given
to the buffer springs around the contact pins, by the attachment of the lamp, to ensure
thorough contact between the pins and the terminal plates of the lamp, as the whole
force of the main spring is constantly tending to draw up the lamp against the ends
of the contact pins, and thus if either or both of the buffer springs is weak the lamp
is pulled up proportionately higher towards the end of the inner case until the
reaction of the buffer springs counteracts the upward pull of the main spring.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what
I claim in respect of a holder in which the terminal plates on an incandescent electric
lamp press, when the lamp is attached, against the ends of contact pins carried by the
holder, is :-
1. The employment of a spring by means of which the lamp is drawn up against
the pressure of the springs or buffers employed in connection with the contact pins,
substantially as described for the purposes set forth.
2. The combination with an inner case, for fixture to the bracket or support by
which the holder and lamp are to be carried, of an outer case capable of sliding
outside the inner case and provided at its lower or outer end with means for the
attachment of the lamp, and of a spiral spring within an annular space between the
cases and operating so that as the outer case is drawn down the spring is compressed,
substantially as described for the purposes set forth.
3. The combination, of the case A provided at its inner or upper end with incans of
attachment to a fixed bracket or support and having a larger and smaller diameter
and carrying within its larger end the insulating material to or within which the
contact pins are mounted, of an outer case B formed to slide over the larger diameter
of the inner case and having an inward flange or ledge at its upper or inner end
capable of sliding along the smaller diameter of the inner case and having its lower
or outer end provided with suitable means for the attachment of the lamp, of the
spiral spring CC, and of a stop to the upward or inward position of the outer case in
relation to the inner case, all substantially as described with reference to the drawings
herewith for the purposes set forth.

page_text: 4. The general construction and combination of parts substantially as described
and shewn by the drawings herewith, for the purposes set forth.
5. Contact pins formed with enlarged heads to bear against buffer springs placed
around the steins of the pins between the heads thereof and plates or corresponding
parts in which the pins are mounted, substantially as described.
Dated this Fifth day of January 1888
STEPHEN WATKINS,
Walsall and Wolverhampton,
Agent for the Applicant.