An Improved Arrangement of Electric Call Bell or Alarum.
Year: 1894

page_text: PROVISIONAL SPECIFICATION.
An Improved Arrangement of Electric Call Bell or Alarum.
REMIGIUS ROGG of 5 Cedar Place, Church Lane, New Charlton, Kent,
Compositor do hereby declare the nature of this invention to be as follows :-
:-
This invention has for object the construction or arrangement of nu electric call
or alaium in a very few parts, the whole being enclosed and the operable parts
protected from dust and dirt also free from moisture which so often produces shoit
cu cuting and other defects
The article is wholly or mostly of metal and can be fixed in any position
vertically, horizontally or otherwise and yet be always in proper condition for
sounding.
The stinking hammer is adjustable for loud or gentle action on the gong to suit,
the position in which the article is to be set or affixed
To carry my invention into practice I make a circular well shaped casing with a
rim flange to enable it to be screwed to a base plate, a wall, a table or the like.
Inside the well I arrange horizontally a pan of electro-magnets and a vibrating
amature this being supported by equi-distant springs to balance it. The armature
carries a cui ved spring the free end of which can be depressed or otherwise acted
upon by an adjustable screw to limit the are of vibrations of the armature
The armature also has the hammer stom affixed, this passing through a slot in
the crown of the casing with the haminer head exposed and in balance with the
amature by the curvature of its stem. The crown has a centre stud or post for
the reception of the gong
The terminal posts or screws for the conducting wires are on the outside, one
terminal is in connection with the electro-magnets and the other with a sping of
the adjustable screw for the usual make and break contact.
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100
R CORE GARDNER,
Fellow Society of Patent Agents, 166 Fleet Street, London,
Agent for the said R. Rogg.
An Improved Arrangement of Electric Call Bell or Alarum.
1, REMIGIUS ROGG of 5, Cedar Place, Church Lane, New Charlton, Kent,
Compositor, 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 mvention has for object the construction or arrangement of an electric
call or alarum in a very fen parts, the whole being enclosed and the operative
parts protected from dust and dit also free from moisture which so often produces
short circuiting and other defects.
The article is wholly or mostly of metal and can be fixed in any position
vertically, horizontally, or otherwise and yet be always proper condition for
sounding.

page_text: The striking hammer is adjustable for loud or gentle action on the gong to suit
the position in which the article is to be set or affixed:
To carry my invention into practice I make a circular well shaped casing with
a rim flange to enable it to be screwed to a base plate, a wall, a table on the like.
Inside the well I arrange horizontally a pair of electio magnets, and a vibrating
armature this being supported by equidistant springs to balance it. The armature
carries a curved spring, the free end of which can be depressed or otherwise acted
upon by an adjustable screw to limit the nic of vibrations of the armature,
The armature also has the hammer stem attixed, this passing through a slot in
the crown of the casing with the bamme head exposed and in balance with the
armature by the curvature of its stem. The crown has a centre stud or post for
the reception of the gong.
The terminal posts or screws for the conducting wires are on the outside, 'one
terminal 15 in connection with the electro-magnets and the other with a spring
having an adjustable screw for the usual make and break contact
In order that the invention may be more clearly understood, reference is had to
the accompanying sheet of drawings, in which
Fig. 1 is a vertical section of the complete arrangement, and Fig. 2 is an inside
view with the bottom, cover plate removed
A 18 the casing of brass or any other suitable material formned with the flange a
to which it can be fixed in any desired position by means of sorows or other well
known arrangements. The cover plate al is fitted at the bottom to completely
enclose the mechanism. Ou the top of the casing the bell or gong B is fitted,
being secured at the upper end of the central post a³ in the usual manner.
Within the casing the two electro-magnets C are placed, carried on a fiame of
non-conducting material, which is screwed to the top of the casing. The vibrating
armature C¹ to which the hammer D is fitted 13 carried by the springs c which are
secured to one end of the frame b. These spings allow the ai mature to vibrate
freely, the vibrations being sufficiently great to cause the hammer at the end of
cach oscillation to strike on the bell or gong. The vibration is regulated by the
curved spring e' the position of which is adjusted by the adjusting screw o'. The
hammer is aanged within the bell and strikes from Inside, being thus concealed
from view
'
The case is provided with two terminals E and E' the current passing from E
to the magnets. The terminal E¹ is connected to the spinge outside for the
make and break contact, this spring being adjusted by the screw e¹.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claun is:
(1.) An improved electric call bell or alarum, consisting of a casing carrying a
bell or gong on top, a pair of electro magnets in the inside casing, a vibrating
armature supported by springs, a curved spring to regulate the vibrations, and a
hammer carried by the armature, and terminals on the casing, substantially as
described and for the purposes specified.
(2.) The improved electric call bell o alarum, constructed and operating
substantially as described and shown in the accompanying drawings, and for the
purposes specified.
Dated this 25th day of September 1905
GEO. H. RAYNER,
37, Chancery Lane, London, Agent for the Applicant.