Improvements in Pushes for Electric Bells and the like.
Year: 1897

page_text: Date of Application, 7th Dec 1897
Complete Specification Left, 6th Sept., 1898-Accepted, 15th Oct., 1898
Complete Specification Left, 6th Sept., 1898-Accepted, 15th Oct., 1898
PROVISIONAL SPECIFICATION.
Improvements in Pushes for Electric Bells and the like.
We, ALWYN WALTER STAVELEY and ISAAC HARDY PARSONS, trading_as Gent
& Co., of Faraday Works, Braunstone Gate, Leicester, in the County of Leicester,
Electrical Engineers, do hereby declare the nature of this invention to be as
follows:-
This invention relates to pushes used for closing electric bell and other electrical
circuits and to that class of such pushes provided with barrel backs. Such pushes
as frequently heretofore manufactured have had the barrel attached to the front
plate by screw threads and the said barrel has had a partition plate soldered into it to
serve as a guide for the front contact, and an ebonite block fixed into it for
carrying the rear contact.
The object of our invention is to simplify the construction and to this end we
provide the following arrangement, that is to say, the front plate is provided with
a rearwardly extending flange or collar to which the barrel or cylinder is soldered
instead of being attached by screw threads as heretofore.
The back end of this barrel has fitted into it a cup the bottom or back of which
has a central hole or aperture formed in it for the back contact to pass through.
This back contact is in the form of a headed screw bolt which is passed through
two discs of insulating material, one on each side of the back of the cup, and
secured by a nut on the outer side which clamps the said two dises tightly against
the said two sides of the cup back, the disc inside the cup fitting into the latter
in such a manner as to prevent contact between the headed screw bolt and the cup,
or barrel.
A second nut serves for the attachment of one of the wire terminals.
The front contact is in the form of a bar fixed at one end to the push button
which is of insulating material and at its other end slides through a central hole
in the end of a second cup within the first cup, the said two cups being held in
position within the barrel by a set screw which also serves for holding the other
wire terminal.
A spring is arranged around the front contact har between the push button and
the back or end of the second cup.
זך.
Tacombon
1907
G. F. REDFERN & Co.,
4, South Street, Finsbury, London.
Agents for the Applicants.

page_text: 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:-
This invention relates to pushes used for closing electric bell and other electrical
circuits and to that class of pushes provided with barrel backs. Such pushes,
as frequently heretofore manufactured, have had the barrel attached to the front
plate by screw threads and the said barrel has had a partition plate soldered into it to
serve as a guide for the front contact, and an ebonite block fixed into it for
carrying the rear contact
The object of our invention is to simplify the construction and to this end we
provide the following arrangement, that is to say, the front plate is furnished with
a rearwardly extending flange or collar to which the barrel or cylinder is soldered
instead of being attached by screws threads as heretofore.
The back end of this barrel has fitted into it' a cup the bottom or back of which
has a central hole or aperture formed in it for the back contact to pass through.
This back contact is in the form of a headed screw bolt which is passed through
two discs of insulating material, one on each side of the back of the cup, and
secured by a nut on the outer side which clamps the said two discs tightly against
the said two sides of the cup back, the disc inside the cup fitting into the latter
in such a manner as to prevent contact between the headed screw bolt and the cup
or barrel. A second nut serves for the attachment of one of the wire terminals.
The front contact is in the form of a bar fixed at one end to the push button,
and at its other end slides through a central hole in the end of a second cup
within the first cup, the said two cups being held in position within the barrel
by a set screw which also serves for holding the other wire terminal.
A spring is arranged around the front contact bar between the push button and
the back or end of the second cup in the usual well known manner.
It will be obvious that the contact bar can be operated by a pull instead of a
push.
In the accompanying drawing,--
Figure 1 is a longitudinal section of a device for closing electric circuits made
according to the invention.
Figure 2 is a similar view of a modification.
Similar letters of reference indicate the same or corresponding parts in both
the figures.
Referring to the arrangement shown in Figure 1 is the front plate, a is the
rearwardly extending flange or collar with which it is provided, and is the barrel
or cylinder which, as above described, instead of being screwed to the flange or
collar is soldered to it.
c is the cup and c is the central hole or aperture which is formed in the back or
bottom thereof. d is the headed screw-bolt forming the back contact, the said
screw-bolt passing through the hole and through the two dises 6, earranged
upon each side of the bottom of the cup and the whole being secured together
by a nut f which is screwed upon the projecting portion of the bolt or screw d.
g is the nut which also screws upon the end of the bolt d so as to clamp one
of the wire terminals. As above mentioned the inside disc e fits into the cup c so
as to prevent contact between the bolt d and the said cup c.
h is the bar which is fixed at one end to the push button i made in the usual
manner. is the second cup which is provided with a central hole and which
fits within the first cup c, the said two cups being held in position in the barrel b by
the set-screwk which also serves to clamp the other wire terminal. 7 is the spring
which is arranged around the bar / between the push button and the back of the
cup j, so as to normally keep the contacts h and apart. By pushing the button i
in the usual manner the said bar h is forced, against the action of the spring, into
contact with the bolt d so as to complete the electric circuit.
Figure 2 illustrates the application of our invention to an electric bell or other

page_text: pull contact. The construction in this case is the same as that above described
with the exception that the bar h, instead of being normally held in its outermost
position by the spring 1, is held in its innermost position by the said spring, as
shewn in the said figure, and in this position breaks the circuit which is completed
by the two spring tongues m, m³ in electrical connection with the two
terminals f, fl similar to the terminal f above described. The two spring
tongues m, m' are fixed to the bottom of the cup c by the screw n, which is insulated
from them by the tube n' and washer n², and are insulated from one another by
the washer o. In this case the screw k merely serves to hold the cups c and j in the
barrel b.
To make contact it will be obvious that it is only necessary to pull the bar h by
means of the handle i away from the spring tongue m when the elasticity of the
latter will at once bring it against the tongue m thereby completing the circuit.
On releasing the handle the spring / returns the bar h which breaks the contact
between the spring tongues m, and m¹ and interrupts the circuit.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:
1. In electric contact devices of the kind hereinbefore described, the employment
in the back end of the barrel or cylinder of a cup having a hole through which
passes one of the contacts which is insulated from the said cup by insulating discs,
and of a second cup which fits within the first cup and is provided with a hole for
guiding the contact bar, the said two cups being held in position in the barrel by
a set-screw which may serve as one of the terminals, substantially as herein before
described.
2. In electric contact devices of the kind hereinbefore described, soldering the
barrel to the front plate and furnishing the end of the barrel with a loose cup
which carries one or more contacts passing through holes in the said cup and
through holes in insulating discs on each side of the bottom of the said cup, with
a second cup fitting within the first cup and designed to guide the contact bar and
with a set-screw for securing the cups in position in the barrel, substantially as
hereinbefore described.
3. The combination and arrangement of parts forming the improved electric
contact making and breaking devices herein before described and illustrated
respectively in Figures 1 and 2 of the accompanying drawing.
Dated the 6th day of September 1898.
1898.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London.
Agents for the Applicants.