Improvements in Incandescent Electric Lamps.
Year: 1892

page_text: Date of Application; 19th July, 1892
Complete Specification Left, 19th May, 1893-Accepted, 1st July, 1893
PROVISIONAL SPECIFICATION.
Improvements in Incandescent Electric Lamps.
I, LOUIS STIRN of 67 Broad Street, New York City in the County of New
York in the State of New York, United States of America, Jeweller, do hereby
declare the nature of this invention to be as follows:-
The object of my invention is to provide a new and improved socket for
incandescent electric lamps, which socket is provided with a switch so constructed
that in order to turn the light on or off it is only necessary to pull downwards a
cord or chain connected with the switch lever.
In carrying out my invention I provide an incandescent electric lamp and a
socket for the same which socket may be of any well known construction. In the
side walls of the socket at two opposite points are formed bearings in which may
work a spindle or shaft on which is fixed a ratchet wheel provided with four cam-
shaped teeth arranged a quarter of a circle from each other. A spring check pawl
is fixed to the top or bottom of the socket and engages said ratchet wheel thus
preventing reverse motion of the same. On said shaft or spindle is loosely
mounted a pawl lever the fulcrum aperture through which the shaft passes being
slightly elongated, that is, its length is greater than the diameter of the shaft, so as
to give said pawl lever a certain play on the shaft. The pawl lever is spring
controlled and is provided at its lower end with a laterally projecting flange the
upper end of which is adapted to engage the teeth of the ratchet wheel.
To the end of the pawl lever a cord or chain is fastened and extends downwards
through an opening in the socket so that it may be pulled by the hand. In the
socket the contact spring is fastened, the free end of which can bear on the contact
piece of the incandescent electric lamp, but is so constructed as to be normally
away from the contact piece of the lamp and the circuit broken.
On the spindle or shaft and adjacent to the ratchet wheel is rigidly secured a
transverse block of oblong or similar shape which when in horizontal position acts
on the said contact spring in such a manner as to press the lower end of the same
against the contact piece of the lamp, and when in vertical position permits said
spring to slip to its normal position away from the contact piece.
The operation is as follows:-The circuit is closed or completed when the
transverse block on the shaft bears against the contact spring and keeps it in
contact with the contact piece of the lamp. By pulling downwards the cord
attached to the loose spring controlled lever a quarter turn is given to the shaft
and the transverse block on same is brought into vertical position, that is, parallel
with the direction of lamp and socket, thus permitting the contact spring to snap
from the contact piece whereby the circuit is broken and the light is extinguished.
To bring the lamp in circuit again, all that is necessary is to pull downwards the
cord so as to give the shaft another quarter turn and move the block in transverse
position again.
In a modification, the transverse block may be made to actuate two contact
springs. The shaft too may be rotated by a clutch mechanism one half of which
is made integral with the loose lever and the other half with the ratchet wheel the
latter being provided as before with a check spring.
ليمن
1
STL 1000
POPPLEWELL & Co.,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Incandescent Electric Lamps.`
I, LOUIS STIRN of 67 Broad Street, New York City, in the County of New
York, in the State of New York, United States of America, Jeweller, 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 :-
The object of my invention is to provide a new and improved, socket for
• incandescent electric lamps, which socket is provided with a switch so constructed
that when it is desired to turn the light on or off it is only necessary to pull a cord
or chain connected with the switch lever.
In the accompanying drawings,
Fig. 1 is a side view of an incandescent electric lamp provided with my improved
socket.
Fig. 2 is an enlarged longitudinal section view through the socket.
Figs. 3 and 4 are transverse sectional views of the socket showing the contact
spring in different positions.
Fig. 5 is an enlarged detail side view of the switch lever and ratchet wheel.
Fig. 6 is a plan view of the same.
Fig. 7 is a detail view of the switch lever showing a modified arrangement.
Fig. 8 is a cross section showing a modification.
Fig. 9 is a sectional plan view of the same, and
Fig. 10 is a section at right angles to Fig. 8.
Similar letters of reference indicate corresponding parts.
In the drawings A represents an incandescent electric lamp and B the socket for
the same, which socket may be of any well known construction. In the side walls
of the socket the spindle or shaft C is journalled, on which is keyed or tighly fixed
a ratchet wheel D'having four cam shaped teeth arranged a quarter of a circle
from each other. A spring check pawl E is fixed to the top or bottom of the
socket and engages said ratchet wheel for the purpose of preventing reverse motion
of the same.
Ön said shaft C a pawl lever F is mounted to swing loosely, said
pawl lever having an aperture F1 which is slightly elongated, (see Fig. 5) that is,
its length is greater than the diameter of the shaft C so as to give said pawl lever
a certain play on the shaft. The pawl lever F is provided at its lower end with a
laterally projecting lug or flange G, the upper end of which is adapted to engage
the teeth of the ratchet wheel D. A helical spring H is wound on the shaft C
and one end is fastened to the side of the socket and the other bears upon the
lower end of the pawl lever F, so as to throw up one end of said pawl lever and to
hold the end provided with the flange G in its lowest position. To the end of the
pawl lever a cord or chain K is fastened that passes through a suitable aperture L
in the socket and extends downwardly and may be provided at its lower end with a
handle. In the socket the contact spring M is fastened, the free end of which can
bear on the contact piece N of the incandescent electric lamp and when released
springs away from said contact piece, as shown in Fig. 4.
On the shaft C a transverse block of insulating material is rigidly fastened,
which when in horizontal position acts on the spring M in such a manner as to
press the lower end of the same against the contact piece N of the lamp, and when
in vertical position permits said spring to snap from the contact piece. In
Figs. 1 to 6 the socket is shown as applied on a lamp the bulb of which is below
the socket but in case the bulb is arranged above the socket (as shown in Fig. 7),
the same form of switch can be used and it is only necessary to pass the cord
over the pulley P in the top edge of the socket and then downwards.
The operation is as follows: As shown in Fig. 3 the circuit is closed. The
block O bears on the spring M and keeps the same in contact with the contact

page_text: piece N of the lamp. By pulling the cord K downwards a quarter turn is given
to the shaft C by the action of the lug or flange G upon the ratchet wheel D, and
the block O is brought into vertical position (as shown in Fig. 4,) thus permitting
the spring M to snap from the contact piece, whereby the circuit is broken and the
light extinguished. To bring the lamp in circuit again, all that is necessary is to
pull downwards the cord K so as to give the shaft C another quarter turn and
move the block O in transverse position again. Under the action of the spring H
the lever swings back again to its normal position when the cord is released and
while thus swinging round moves to the left (as in drawing), as its lug G is guided
along the cam shaped edges of the teeth of the ratchet wheel D, the elongated
opening F in the lever F allowing such movement.
In Figs. 8, 9 and 10 a modification of my socket is shown. The shaft C is
provided with the block O, which in this case acts on two contact springs m.
Said
shaft also carries the ratchet wheel D (as before), which is made integral with a
clutch d. A clutch sleeve is mounted loosely on the shaft C and is made
integral with the inner end of the lever adapted to swing loosely on the shaft C
and which passes through a longitudinal slot (Figs. 9 and 10) in the side of the
socket. The helical spring has one end fastened to the socket and the other end
to the inner end of the leverf (as before described), and serves to keep said lever f
in-its raised position. A spring actuated pawl g engages the ratchet wheel D.
The ratchet wheel D in this case also has four teeth. By pulling down the outer
end, of the lever the ratchet wheel D is given a quarter turn, and when the lever f
is released its spring 1 throws it up again. As the lever fis swung down its clutch
member engages the clutch d made integral with the ratchet wheel and shaft
and turns the same, and when the lever swings upwards under the action of its
spring the clutch & is held in position and the clutch sleeve d' slides over the same
returning to its position by the dual action (lateral and spiral) of spring h. It will
be seen that the principle is the same as that shown in the construction in Figs. 1
to 7 and the constructions differ only slightly from each other.
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 is :-
1. The combination with an incandescent electric lamp socket containing an
electrical conductor, of a transverse shaft in said socket, a block fixed on said
shaft, a spring-actuated pawl-lever mounted on the shaft, a ratchet-wheel fixed on
the shaft, means for engaging and turning said ratchet-wheel by the said pawl-
lever, a check pawl engaging the ratchet wheel and a cord or wire connected with
the lever, substantially as set forth.
2. The combination with a socket provided with an electrical conductor, of a
shaft journalled in said casing, a block fixed on said shaft and adapted to act on
said conductor, a ratchet wheel fixed on the shaft, a lever mounted loosely on the
shaft and provided at one end or flange serving as a pawl, a spring acting on said
lever, a check-pawl engaging the ratchet-wheel and a cord connected with said
lever and passing through an opening in the socket, substantially as set forth.
3. The combination with a socket provided with an electrical conductor, of a
shaft mounted in the sides of said socket, a block fixed on said shaft and adapted
to act on the electrical conductor, a pawl-lever mounted loosely on the shaft and
provided with an elongated opening, through which the shaft passes, a helical
spring surrounding said shaft and having one end fixed to said socket and the
other end to the pawl lever; a projection on said lever serving as a pawl, a ratchet
wheel fixed on the shaft, the teeth of which are engaged by said projection, a
check-pawl engaging the ratchet-wheel and a cord attached to said lever and
passing through an opening in the socket, substantially as set forth.
4. The combination with a socket containing an electrical conductor, of a shaft
in said socket, a block fixed on said shaft and adapted to act on the conductor, a
ratchet wheel on the shaft, a rocking pawl-lever mounted on the shaft and engaging

page_text: the ratchet-wheel, a cord secured to the pawl-lever, a pulley on the socket, over
which the cord passes, said cord also passing through an opening in the socket,
substantially as set forth.
5. The combination with a socket, of an electrical circuit opening and closing
device within said socket, and a cord manipulating said device and passing through
an aperture in said socket, substantially as set forth.
6. The combination with a socket, of an electrical conductor in the same, a
spindle or shaft arranged in said socket, a block fixed on the spindle, a ratchet
wheel on the shaft, a rocking lever on the shaft and a clutching device interposed
between the lever and the ratchet wheel so as to produce the turning of the block
when the lever is moved in downward direction without turning the shaft when the
lever is returned by its spring in upward direction, substantially as set forth.
7. The switching device for incandescent electric lamps substantially as herein-
before described with reference to Figures 1, 2, 3, 4, 5, 6, and 7 of the accompanying
drawings.
8. The switching device for incandescent electric lamps substantially as
herein before described with reference to Figures 8, 9, and 10 of the accompanying
drawings.
1100
LOUIS STIRN,
By Popplewell & Co.,
17 & 18, Southampton Buildings, London, W.C.,
Chartered Patent Agents.
LOUIS STIRN,
By Popplewell & Co.,
17 & 18, Southampton Buildings, London, W.C.,
Chartered Patent Agents.