Improvements in and relating to Electrical Bell Pushes.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in and relating to Electrical Bell Pushes.
I, MAUNSELL MERCIER, of Greengate Electric Works, Salford, in the County of
Lancaster, Electrical Engineer, do hereby declare the nature of this invention to
be as follows: —
My invention relates to that class of electrical bell pushes which are commonly
used for the purpose of transmitting signals and more especially those which are used
for domestic purposes. My invention has for its object the provision of means
whereby moisture is prevented from reaching and effecting the contact pieces in
whatever position the push is placed.
In carrying my said invention into effect I construct a case of the ordinary type
made in two parts. One part is formed as a circular base or pattress so as to per-
mit of it being screwed or otherwise fixed to a wall or other suitable surface and
is provided with an upwardly projecting annular flange screwed on its outer surface,
and enclosing a chamber in which the spring contact piece is placed. The other
part forms a cap or cover and is internally threaded to fit the flange. The cap
is also provided with a central hole through which the push button projects.
In the back of the base or pattress I turn or otherwise form an annular groové
in which I place an indiarubber ring of such a size that when in position it projects
slightly beyond the surface of the base or pattress so that when the latter is screwed
into position against the wall or any other surface the indiarubber ring makes
a watertight joint and thus prevents moisture reaching the wires or effecting the
contact piece. I fix the push in the centre of a disc diaphragm or washer of india-
rubber or other suitable material which is of sufficient diameter as to fit inside
the cap or cover so that when the latter is screwed down into position the pressure
on the washer between its inner surface and the upper edge of the base or pattress
flange makes a watertight joint. When the case is fixed in position the contact
piece is in the manner described protected from damp alike at the back and the.
front.
I can also apply my invention to that form of push known as a barrel push by
so constructing the case as to permit of the introduction of indiarubber rings or
washers which form watertight joints on each side of the contact piece. I also
arrange that the conducting wires are passed through a watertight packed gland
arranged at the end or the side of the barrel!
Dated this 30th day of June 1897.

page_text: 1
COMPLETE SPECIFICATION.
Improvements in and relating to Electrical Bell Pushes.
I, MAUNSELL MERCIER, of Greengate Electric Works, Salford, in the County of
Lancaster, Electrical Engineer, 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 that class of electrical bell pushes which are commonly
used for the purpose of transmitting signals and more especially those which are used
for domestic purposes. My invention has for its object the provision of means
whereby moisture is prevented from reaching and affecting the contact pieces in
whatever position the push is placed: >
J.
i
In order that my invention may be better understood and the more easily.
carried into effect I have hereunto appended a sheet of drawings wherein Fig. 1
is a section of my improved bell push, Fig. 2 is a back view and Fig. 3 shows the
button fixed in the flexible diaphragm.
1
In carrying my said invention into effect I construct a case of ordinary type
made in two parts, one part' A being formed as a pattress or base to permit of it
being screwed to a wall or other suitable surface and provided with an annular
flange B screwed on its outer surface and enclosing a chamber C in which the
spring contact piece is placed. The other portion D forms a cap or cover and is
internally threaded to fit the flange B. The cap is also provided with a central
hole through which the push button E projects. In the back of the base A I
turn or otherwise form an annular groove F in which I place an indiarubber
ring G'of such a size that when in position it projects beyond the surface of the
base A so that when the latter is screwed into position against the wall or other
surface the ring makes a watertight joint and thus prevents moisture reaching
the wires or 'affecting the contact pieces H H. Holes K K¹ are drilled in the
base A to permit of the conducting wires being passed to the contact pieces H H.
I fix the push button E in the centre of a disc diaphragm or washer J made of
indiarubber or other suitable material which is of sufficient diameter as to fit
inside the cap or cover so that when the latter is screwed into position the pres-
sure on the washer between its inner surface and the edge or face of the flange B
makes a watertight joint. When the case is fixed in position the contact pièce is
in the manner described protected from damp alike at the back and the front.
"
-11
I can also apply my invention to that form of push 'known as a barrel push by
so constructing the case as to permit of the introduction of indiarubber rings or
washers which form watertight joints on each side of the contact piece. I also
arrange that the contact wires are passed through a watertight packed gland
arranged at the end or the side of the barrel.
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:-
The combination with a bell push of ordinary construction of. flexible rings
or diaphragms whereby the contact piece can be effectually sealed from the action
of moisture all arranged in the manner and for the purpose as herein described
and illustrated.
"."
Dadd 100th of a. 1000
JOSEPH NASMITH,
Agent for the Applicant.