IMPROVEMENTS IN BELL OR GONG RINGING OR ANNUNCIATING APPARATUS
Year: 1885

page_text: Apparatus.
I ALFRED GEORGE BROOKES of the firm of Wm Brookes & Son of 55 & 56
Chancery Lane in the County of Middlesex Fellow of the Institute of Patent
Agents, do hereby declare the nature of my invention for IMPROVEMENTS IN BELL
OR GONG RINGING OR ANNUNCIATING APPARATUS, to be as follows:-
The invention relates to improvements in mechanical apparatus for, ringing
door- or signal- bells or gong alarms or annunciating; and the objects of the
improvements are to obtain mechanically a vibrating sound of the bell similar to
that of an electric ringing apparatus.
A string, band or like connection is drawn from the object to be pulled or
moved, viz. a door knob, a swinging door leaf or other closing or moving part over
or around a roller fastened to the axis of a crank which is connected by means of
link-rod with an arm projecting from a shaft to which a pair of hammers
actuating the bell are fastened. As the crank is not so long as the arm, the latter
will only oscillate when the crank rotates by the pull acting on the string and the
gong hammers will be caused to oscillate also and to produce a vibrating sound of
the bell. A counter weight suspended at the free end of the string returns the
string after the pull exerted thereon (for instance by the person who is entering
the door) has ceased, into its former position thereby rotating the crank roller in
the opposite direction and thus causing the gong to sound a second time.

page_text: Improvements in Bell or Gong Ringing or Annunciating
Apparatus.
ALFRED GEORGE BROOKES of the firm of Wm Brookes & Son of 55 & 56
Chancery Lane in the County of Middlesex Fellow of the Institute of Patent
Agents 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:-
The invention relates to improvements in mechanical apparatus for ringing
door or signal bells or gong alarms or annunciating; and the objects of the
improvements are to obtain mechanically a vibrating sound of the bell similar to
that of an electric ringing apparatus.
These objects are attained by the mechanism illustrated in the accompanying
drawing in which
Figure 1 is a top view of a door bell provided with my improvements; figure 2
is the same view after removing the shell cover with the bell; figure 3 is a side
elevation one side of the shell being opened to shew the inside parts; and figure 4
is a cross section at the line y. s.
Similar letters refer to similar parts throughout the several views.
A string, band or like connection a is drawn from the object to be pulled or
moved viz a door knob, a swinging door leaf or other closing or moving part over
or around a roller b fastened to the axis c of a geared wheel d engaging into a
small gear e; to the axis f of the latter is attached a crank' g, which is connected
by means of a link rod h with an arm i projecting from a shaft k, to which a pair
of hammers actuating the bell m are fastened.
As the crank g is not so long as the arm i, the latter will only oscillate, when
the crank rotates by the pull acting on the string a and the gong hammers will be
caused to oscillate also and to produce a vibrating sound of the bell.
A counter weight n suspended at the free end of the string a returns the
string, after the pull. exerted thereon (for instance by the person who is entering
the door) has ceased, into its former position thereby rotating the roller b in the
opposite direction and thus causing the gong to sound a second time.
The geared wheels d and e may be omitted entirely and the roller b may be
fastened directly upon the crank shaft f; but in the first construction the strokes
of the hammers will follow each other a good deal quicker than in the latter
construction,
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is:-
In a device for ringing bells or gong alarms or annunciating the combination of
the string, band or like connection a and counter weight n with the roller b the
crank g, the connecting rod h, the arm i, the hammers, and the bell m,
substantially as and for the purpose specified.
Dated this 1st day of July 1886.