Improvements in or appertaining to Electric Bells or Alarms.
Year: 1894

page_text: Date of Application, 14th Dec., 1894
Complete Specification Left, 14th Sept., 1895-Accepted, 19th Oct., 1895
PROVISIONAL SPECIFICATION.
Improvements in or appertaining to Electric Bells or Alarms.
.
1, JOHN THOMAS BRIERLEY of Rivington View, Chorley in the County of
Lancaster, Analytical Chemist, do hereby declare the nature of this invention to
be as follows:-
Electric bells at the present time are usually rung by a push on the door forming
a contact. If a little dust gets in between the plates no contact is made, but the
person ringing cannot tell whether the bell be rung or not.
Now my invention is designed to make it absolutely certain that the connection
will be made, and thus the bell rung, and also to arrange so that the ordinary bell
pull can be used.
In place of having the break in the circuit at the push as is usually the case, I
place it in any convenient position, preferably, however, not far from the pull or
push which is to cause the contact. I then connect the pull or push with a lever
and on this lever place a plate dipping into a mercury cup in contact with the other
pole of the circuit. A spring or weight or other like force keeps the plate connected
with the bell pull or push out of the mercury when the push or pull is not in
operation. The moment a push or pull occurs, however, it depresses the plate
into the mercury and thus completes the circuit. It can be arranged so that the
plate shall almost touch the mercury, consequently the very slightest depression
will cause a contact, and the mercury being liquid all fear of dust stopping the
contact is avoided.
The plate if desirable can be a simple wire or a bunch of wires instead of a plate.
It can be of iron or any other metal not acted upon by cold mercury.
Dated this 13th day of December 1894.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.
COMPLETE DIUITIATION.
Improvements in or appertaining to Electric Bells or Alarms.
1, JOHN THOMAS BRIERLEY, of Rivington View, Chorley in the County of
Lancaster, Analytical Chemist, 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:-
Electric bells at the present time are usually rung by a push on the door forming
a contact. If a little dust gets in between the plates no contact is made, but the
person ringing cannot tell whether the bell be rung or not.
Now my invention is designed to make it absolutely certain that the connection
will be made, and thus the bell rung, and also to arrange so that the ordinary bell
pull can be used.
In place of having the break in the circuit at the pusb, as is usually the case,
I place it in any convenient position, preferably, however, not far from the pull'or
push which is to cause the contact. I then connect as shown on the accompanying

page_text: A
diagram the pull A. or push with a lever B and on this lever place a plate C
dipping into a mercury cup D in contact with the other pole E of the circuit.
spring For weight or other like force keeps the plate connected with the bell pull
or push out of the mercury when the push or pull is not in operation. The moment
a push or pull occurs, however, it depresses the plate into the mercury and thus
completes the circuit. It can be arranged so that the plate shall almost touch
the mercury, consequently the very slightest depression will cause a contact,
and the mercury being liquid all fear of dust stopping the contact is avoided.
The plate if desirable can be a simple wire or a bunch of wires instead of a plate.
It can be of iron or any other metal not acted upon by, cold mercury.
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 improvements in or, appertaining to electric bells or alarms which consist
in dipping one pole of the circuit in mercury and in causing the other pole, on the
push knob or bell pull being operated, to also dip into the mercury thereby making
it absolutely certain that the contact will be made.
2. The improved contact device substantially as described and shown whereby
an ordinary bell pull can be used for ringing electric bells or alarms.
Dated this 13th day of September 1895.
WM. P. THOMPSON & Co.,
Of Liverpool, Manchester, Birmingham and London, Patent Agents.