Improvements in Electric Incandescent Lamp Holders.
Year: 1897

page_text: Date of Application, 11th Mar., 1897
Complete Specification Left, 11th Dec., 1897-Accepted, 15th Jan., 1898
PROVISIONAL SPECIFICATION.
Improvements in Electric Incandescent Lamp Holders.
We, HERBERT HAMPTON HALL, of 126a, Duke Street, Liverpool, in the County
of Lancaster, Electrical Engineer, and THOMAS CLARKE, of 44, Esmond Street,
Anfield, Liverpool, in the County of Lancaster, Engineer, do hereby declare the
nature of this invention to be as follows: —
The improvements refer more partioularly to the improved lamp holders in which
the leads or wires pass directly through holes in the contact pieces embedded in
porcelain insulators and provided with binding screws at the sides and the main
object of these improvements is to facilitate the connection of the lamps to the
leads or wires and the attachment of the same to the pendants or brackets.
Our first improvement consists in piercing the screwed shell containing the
porcelain insulator and spring contacts, with holes opposite the binding screws
of the contact pieces for the leads or wires, in order that the said screws may be
tightened upon the said leads or wires or loosened therefrom when connecting or
removing the lamp holder by means of a screwdriver or other instrument being
inserted into said holes without having first to remove the screwed shell from the
porcelain insulator.
Our further improvement consists in providing a flanged sleeve or collar which
we attach by means of a screw thread to the pendant or bracket, over which
collar has been first passed a union nut which is formed to screw upon the shell
aforesaid. By this arrangement the lamp holder is more readily attached to the
pendant or bracket than when the union nut is passed over a separate part of the
lamp holder and screwed upon a collar fixed to the pendant or bracket, and
the twisting of the leads or wires is avoided.
Improvements in Electric Incandescent Lamp Holders.
We, HERBERT HAMPTON HALL, of 59 and 61, formerly of 126a, Duke Street,
Liverpool, in the County of Lancaster, Electrical Engineer, and THOMAS CLARKE,
of 44, Esmond Street, Anfield, Liverpool, in the County of Lancaster. Engineer,
do hereby declare the nature of this invention and in what manner the same is to

page_text: be performed to be particularly described and ascertained in and by the following
statement:-
The improvements refer more particularly to the improved lamp holders for
incandescent electric lamps in which the leads or wires pass directly through holes
in contact pieces embedded in porcelain insulators and provided with binding screws
at the sides; and the main object of these improvements is to facilitate the con-
nection of the lamps to the leads or wires and the attachment of the same to the
pendants or brackets.
Hitherto in attaching a lamp holder to the leads it has been necessary to first
take the lamp holder to pieces in order to be able to attach the contact pieces to
the leads, owing to the peculiar position of the binding screws, which is necessary
where the leads pass directly into or through the contact pieces without being bent.
Also the mode of attachment of the lamp holder to the pendant or bracket after the
leads were connected rendered it desirable to first attach the crown or can of the
holder to the pendant or bracket, which, when omitted frequently led to the twisting
of the leads and tended to some extent to short circuit the current.
We find that by the use of our improvements the attachment of the lamp holders
to the leads and to the pendants or brackets is greatly facilitated and the tendency
to the short circuiting of the current in the leads is obviated.
The drawings attached hereunto illustrate the application of our improvements
to lamp holders of the most improved construction at present in use.
In the said
drawings the first four figures illustrate the construction of a lamp holder of well-
known manufacture, Figure 1 representing an elevation, Figure 2 a sectional
elevation, Figure 3 a plan looking from the top, and Figure plan looking from
the underside.
Figure 5 illustrates an elevation of our improved lamp holder, Figure 6 a
sectional elevation, Figure 7 a plan looking from the top, and Figure 8 a cross
section through liner, Figure 5, looking from the underside. In the several
figures like parts are indicated by like letters of reference.
Referring first to Figures 1 to 4, a represents the casing of the holder which is
externally screwed to receive a nut a¹ for securing thereto the shade or reflector
indicated by dotted lines a³, and has a flange a against which bears the flange
of a union nut a*. 6 represents the crown or cap which is externally screwed to
receive the union nut a by which it is attached to the casing a, and formed with
a screwed socket b¹ for its attachment to a tubular pendant or bracket through which
are carried the leads. c represents the insulator which carries the metal contact
pieces d, d, provided with spring contacts №³, №³, which insulator is made of
porcelain. Holes d, d³, pass directly through the contact nieces, into which holes
pass the binding screws (, d for the leads. The insulator e is seated loosely in
the casing a upon a flange a, and is prevented from turning round by a catch or
catches a entering into a groove or grooves e in the insulator. In is obvious
that the insulator and contact pieces attached thereto must be removed from the
casing when attachment is made to the leads, necessitating the assembling of the
parts of the holder while it is being fixed to the pendant or bracket. The crown
or cap.
6 is first screwed on to the pendant or bracket; then the porcelain insulator
with the contact pieces is attached to the leads by means of the binding screws
d³, d'; afterwards the casing a is passed over the insulator and connected to the
crown 6 by means of the union nut a. In practice it is easier and quicker to make
the attachment of the holder to the pendant or bracket by turning the holder round
along with the union nut, and this leads to the twisting of the leads and frequently
to the short circuiting of the current.
Our improvements will be readily understood by reference to Figures 5, 6, 7,
and 8 of the drawings. In the casing a holes a7, 8, are pierced opposite the binding
screws d³, d', through which holes can be inserted the nose of a screwdriver to turn
the binding screws, thus enabling the connection of the holder and contact pieces
to the leads to be made with the parts of the holder assembled. The top rim or

page_text: flange a³ of the casing is screwed externally, a flange a being formed inside for
seating the insulator c and a catch or catches a engaging a groove or grooves el
in the insulator to prevent the latter from turning round. The crown or cap bis
internally screwed at 62 to fit the externally screwed rim a³ of the holder, and is
externally screwed at the socket to receive a union nut 63 and liner which
latter is screwed to the end of the tubular pendant or bracket.
After the leads have been connected to the holder when the parts thereof are
completely assembled, the holder is quickly attachable to the pendant or bracket
by screwing on to the part b' the union nut 3 which is supported by the flange of
the liner fixed to the said pendant or bracket.
Having now particularly described and ascertained the nature of our said in-
vention and in what manner the same is to be performed, we declare that what we
claim is:
First. The improvement in electric incandescent lamp holders which consists
in piercing the casing of the holder with holes opposite the binding screws of the
contact pieces for the leads, so that a suitable instrument can be inserted there-
through to turn the screws for securing and releasing the leads without having
to remove the contact pieces from the holder substantially as hereinbefore described
and illustrated in Figures 5, 6, 7 and 8 of the drawings.
Second. The improvement in electric incandescent lamp holders for securing the
same to tubular pendants and brackets, which consists in attaching a sleeve liner
and screwed union nut to the end of the tubular pendant or bracket and forming
the crown or cap of the holder, to screw on to the rim of the same and with an
externally screwed nozzle to fit the screwed part of the union nut so that the holder
can be quickly attached to the pendant or bracket, substantially as herein before
described and illustrated with reference to Figures 5, 6, 7, and 8 of the drawings.
Third. The improved construction of electric incandescent lamp holder in which
the casing of the holder is pierced with holes opposite the binding screws of the
contact pieces and in which the crown or cap of the holder is externally screwed
to receive a union nut and a liner prepared to fit the end of the tubular pendant or
bracket substantially as and for the purposes hereinbefore described and illustrated
by Figures 5, 6, 7, and 8 of the annexed drawings.
Dated this 10th day of December 1897.
R. J. URQUHART,
57, Barton Arcade, Manchester, 24, North John Street, Liverpool,
Consulting Engineer & Patent Agent.