IMPROVEMENTS IN APPARATUS FOR OPENING AND CLOSING ELECTRIC CIRCUITS
Year: 1884

page_text: We FREDERICK HENRY VARLEY of 82 Newington Green Road Electrical
Engineer WILLIAM BEALE of Holloway Road Confectioner ROBERT HENRY
PADBURY of Mildmay Grove Engineer and JOHN RONALD SHEARER of Basinghal
Street Accountant all in the County of Middlesex do hereby declare the nature
of our Invention for IMPROVEMENTS IN APPARATUS FOR OPENING AND CLOSING
ELECTRIC CIRCUITS to be as follows:-
In the employment of electricity for indicating or communicating signals or
currents it is often found necessary for the call button or contact maker &c. should
be placed in an exposed position where it is subject to the effects of moisture dust
or vapour or other causes Under such circumstances the insulation often fails a
current is thereby established acting electro-litically increasing the corrosion or
decay of the working parts whereby the mechanism is rendered uncertain or
unreliable-To render our apparatus free from the above defects we preferably
divide the apparatus into two parts.
The first being mechanical the mechanical part is made of such strength as to
admit of rough handling on strong pull-or heavy blow. The second part of our
invention consists of electrical commutator or circuit opener or closer this latter we
place in air tight case for the purpose of preserving the contacts and the working
parts from dust &c. The contacts and moving parts are actuated by and through
the employment of a plunger stem on rod which in their normal position either
keeps open or close the electric circuit according to special requirements. This
plunger is made preferably air tight by packing or other suitable means and when
moved by means of a button or pull sets in motion the apparatus in such manner
that any undue strain put upon the button pull or equivalent does not interfero
with the proper action of the arrangements as described.

page_text: We FREDERICK HENRY VARLEY of 82 Newington Green Road Electrical
Engineer WILLIAM BEALE of Holloway Road Confectioner ROBERT HENRY
PADBURY of Mildmay Grove Engineer and JOHN RONALD SHEARER of Basinghall
Street, Accountant, all in the County of Middlesex do hereby declare the nature
of our said Invention for IMPROVEMENTS IN APPARATUS FOR OPENING AND CLOSING
ELECTRIC CIRCUITS and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement:-
In the employment of electricity for indicating or communicating signals or
currents it is often found necessary for the call button or contact maker to be
placed in an exposed position where it is subject to the effects of moisture dust or
vapour or other causes.
Under such circuinstances the insulation often fails-A current is thereby
established acting electro-lytically increasing the corrosion or decay of the working
parts whereby the mechanism is rendered uncertain or unreliable.
To render our apparatus free from the above defects we preferably divide the
apparatus into two parts.
The first being mechanical-The mechanical part is made of such strength as to
admit of rough handling or strong pull, or a heavy blow.
The second part of our invention consists of electrical commutator, or circuit
opener or closer:-this latter we place in an airtight case for the purpose of
preserving the contacts and the working parts from dust etc.
The contacts and moving parts are actuated by and through the employinent of
a plunger, stem or rod which in their norinal position either keep open or close the
electric current according to special requirements.
This plunger is made preferably air tight by packing or other suitable means,
and when moved by means of a button or pull, sets in motion the apparatus in
such manner that under any undue strain put upon the button pull or equivalent
does not interfere with the proper action of the arrangements as described.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the saine is to be performed we declare that what
we claim is :-
The use of a mechanical moving piece or moving pieces detached from
the moving parts effecting the electrical contact or electric contact breaker
or breakers the former being so made that the ordinary rough fittings are
sufficiently loose not to be wedged or fixed by rust or corrosion, whilst the
contacts are placed in an airtight case-and the contact plunger which is actuated
by the mechanical push fits in an airtight stuffing box or packing chamber, so that
when the push or pull piece is subjected to rough handling, a heavy blow, or
strong pull the strain is borne only by the mechanical part of the invention as
distinguished from the electric system.
A