Improvements in Holders or Sockets for Electric Incandescent Lamps.
Year: 1898

page_text: PROVISIONAL DI MULTICATION.
Improvements in Holders or Sockets for Electric Incandescent Lamps.
REUBEN JAMES BOTT, Electrical Engineer, Down Hill Villa, 235, Phillip Lane,
West Green, Tottenham, N., do hereby declare the nature of this invention
to be as follows:-
My invention relates to improvements in sockets or holders for electric incan-
descent lamps. It is like those heretofore in use, adapted for use with lamps of
low candle power, but is especially adapted to meet the requirements for lamps of
high candle power and voltage.
Its object is to make a socket or holder so that the current shall be conveyed
direct from the terminals securing the leading in wires to the contacts on the
lamp end, and further, the mechanical portions of the holder shall be distinct
and separate and have no electrical connection with the portions carrying the elec-
tric current, and further an improved joint for attaching and detaching the lamp
from the socket or holder.
I make a circular disc or body of suitable insulating material, which is a work-
ing fit within the metal casing, resting when not in use upon the top of the
later.
The disc is held to the casing by cross pins and a spiral or other type of spring,
so adapted in respect of strength that when the lamp is inserted in the holder, the
casing is pushed away, or slides down the disc or body. When I use a single
spiral one, it is placed centrally, and is held to the disc and casing by cross pins,
one lying across the top of the disc, and the opposite one engaging with opposite
sides of the casing. A slot is formed in the bottom side of disc for the lower
cross pin, thereby keeping the disc in its position in the metal casing. Such a
spring will be in tension when it is in operation, or I may use a compression
spring arranged above the insulated disc and some fixed position of the socket
fitting.
The contacts are a pair of fixed studs, depending from the insulated disc as a
solid pin or tube, provided with suitable holes in the top to receive the leading in
wires, and is secured to the disc with a binding screw entering through its side.
The said screw serves a double purpose viz.:-it secures the pin to the insulated
disc, and screws up the leading in wires in the terminal hole in the top of pin.
Another part of my invention relates to the improved joint for attaching and
detaching the lamp in the holder or socket. The device in general use for engaging
the studs on the side of the lamp collar, is a bayonet joint slot on each side of the
metal casing of socket. The act of attaching a lamp to a socket made with a
bayonet joint slot, involves two distinct motions, one of insertion and a second
one at right angles with the former to lock the lamp. According to my present
invention, each slot is diagonal from the edge upwards and terminates in a
depression to receive the studs on the lamp collar, there is therefore only one

page_text: motion required to insert and fix the lamp in holder viz.:-a twisting or circular
motion, the lamp engages and locks itself automatically.
Dated this 13th day of January 1898
Improvешение потистS 05 DOCкои го глесяте сапиенсень матрь.
REUBEN JAMES BOTT, Electrical Engineer, Down Hill Villa, 235, Phillip Lane,
West Green, Tottenham, N., 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:-
-
My invention relates to improvements in sockets or holders for incandescent
electric lamps. It is like those heretofore in use, adapted for use with lamps of
low candle power, but it is especially adapted to meet the requirements for lamps
of high candle power and voltage.
Its object is to make a socket or holder so that the current shall be conveyed
direct from the terminals securing the leading in wires to the contacts on the
lamp end, and, further, the mechanical portions of the holder shall be distinct
and separate and have no electrical connection with the portions carrying the
electrical current and further an improved joint for attaching and detaching the
lamp from the socket or holder.
Fig. 1 as shewn in the accompanying drawing is a sectional elevation of a
holder with the spring working in tension.
Fig. 3 is a plan showing the disc or body fitted with the fixed studs or contact
pins, with the terminal screws securing them in position.
Fig. 2 is a sectional elevation of the disc or body with the spring working in
compression.
I make a circular disc or body of suitable insulating material A as shewn in
Fig. 1, which is a working fit within the metal casing B, resting when not in
use upon the top of the latter. The disc is held to the casing by cross pins C
and and the spring D, so axlapted in respect of strength that when the lamp is
inserted in the holder the casing is pushed away or slides down the disc or body.
The spring D is placed centrally, in the disc. The upper cross pin is attached to
the spring and lies across the top of the disc, the lower cross pin being attached
to the lower end of the spring and engages with the opposite sides of the casing,
the lower cross pin works in the slot E of the disc keeping it in its position on
the casing.
When I use a spring working in compression the spring rests in the bottom
of the hole F in the disc as shewn in Fig. 2, the casing being extended on oppo-
site sides G and G', as shewn in plan Fig. 3, the disc being recessed to receive
the extended ends of the casing, the pin H being attached to the opposite sides
of the casing G and G and lies across the top of the spring I.
The contacts are a pair of fixed studs J and J¹, provided with suitable holes K
and K to receive the leading in wires, and are secured to the disc with the bind-
ing screws L and L¹ entering through its side. The said screws serve a double
purpose, viz.; they secure the contact pins to the insulated disc, and screw up
the leading in wires.
Another part of my invention relates to the improved joint for attaching and
detaching the lamp in the holder or socket. The device in general use for engaging

page_text: the studs on the side of the lamp collar, is a bayonet joint slot on each side of the
metal casing of the socket. The act of attaching a lamp to a socket made with a
bayonet joint slot, involves two distinct motions, one of insertion and a second
one at right angles with the former to lock the lamp. According to my present
invention, as shewn in Fig. 1, each slot M is diagonal from the edge upwards,
and terminates in a depression to receive the studs on the lamp collar, there is
therefore only one motion required to insert and fix the lamp in the holder, viz.:
a twisting or circular motion, the lamp engages and locks itself automatically.
Having now particularly described and ascertained the nature of my said
invention. and in what manner the same is to be performed, I declare that what
I claim is:
1. An incandescent electric lamp holder or socket whereby the electric current
is conveyed through fixed studs or pins direct from the leading in wires to the
lamp contacts without passing through springs, the connection being secured by
the tension or compression of a spring as described not in contact with the electric
current.
2. A graduating bayonet slot whereby a lamp is engaged with one motion to
insert and fix it.
3. An incandescent electric lamp holder or socket, whereby the current is con-
veyed direct from the leading in wires through the fixed studs or pins to the
lamp contacts in combination with a graduated bayonet slot, whereby a lamp can
be engaged with one motion to insert and fix it.
Dated this 12th day of November 1898