Year: 1893

page_text: Date of Application, 1st July, 1893
Complete Specification Left, 9th Feb., 1894-Accepted, 17th Mar., 1894
PROVISIONAL SPECIFICATION.
Alarm Bells.
I, CHARLES EBENEZER CHALLIS, of No. 30 Navarino Road, Hackney,
London N.E., Machinist do hereby declare the nature of this invention to be as
follows:-
―:
In constructing my alarm bells for use on cycles I mount a gong or bell upon a
bridge springing from a horizontal base plate or its equivalent, on this plate near
one side of the bell a hammer is pivotted so as to swing freely from side to side
of the bell; from the pivotal portion of the hammer rise two walls set at an angle
with each other that is to say approaching one another at one end and diverging
at the other-between these walls a lever works, this has its fulcrum at the
opposite side of the plate with the finger piece projecting beyond, the lever is
brought to its position of rest by a spring wound upon a boss at its fulcrum or
otherwise.
Thus on the lever being pulled the portion between the walls presses upon one
wall at the part that it approaches most nearly to the other, this causes the
hammer to swing over until the entire length of one wall lies flat along the lever,
the momentum acquired by the hammer however causes a slight reversal of the
movement of the lever as the hammer swings beyond its position of rest to reach
the bell; thus the parts may be mounted rigidly as the clearance necessary between
the hammer and the bell is passed not by the yield or give of the various parts
but by a very slight return movement of the spring.
The lever being released by the finger is returned by the spring and the action
is repeated in the opposite direction.
It is manifestly possible to substitute four studs or other equivalent for the
walls above described or to have walls or studs upon the lever and a bar across the
pivotal portion of the hammer, or the hammer may hang vertically from the crown
of bell and the lever be worked at right angles or otherwise; and further if the
alarm is intended to ring at times from the vibration of the cycle to which it is
attached a wall on hammer may be so shortened at one side that the lever
exercises little control over that side-the lever being held in position by a stop.
For attachment to cycles a fastening is constructed as follows: Across the
base plate or its equivalent runs a thickening ridge cut with transverse notches, in
one of these notches a wire is laid, which after encircling a portion of the cycle,.
is jointed to a bar which terminates in a socket at the further side of the base
plate, near the joint the bar is penetrated by a screw which depends from the base
plate, a nut upon the screw enables the bar to be drawn in the direction of the
base plate and so causes the wire to be drawn as tightly as required-the action
being similar to a vice.
A flat band may be used instead of the wire by letting the transverse slots enter
cylindrical holes and curling the ends of the band, which are slid in from the end
of the holes.
Various modifications of shape and adaptations to special uses may be made
without departing from the principle above set forth.
DAL T
1
1
1000

page_text: Alarm Bells.
I, CHARLES EBENEZER CHALLIS of No. 30 Navarino Road, Hackney
London N.E., Machinist, 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 :-
"
In constructing my alarm bell for use on cycles I mount a gong or bell upon a
bridge springing from a horizontal base plate or its equivalent, on this plate near
one side of the bell a hammer is pivotted so as to swing freely from side to side
of the bell, from the pivotal portion of the hammer rise two "walls set at an
angle with each other, that is to say approaching one another at one end and
diverging at the other between these walls a lever works; this has its fulcrum at
the opposite side of the plate, with the finger piece projecting beyond; the lever
is brought to its position of rest by a spring wound upon a boss at its fulcrum, or
otherwise. Thus on the lever being pulled the portion between the walls presses
upon one wall at the part that it approaches most nearly to the other, this causes
the hammer to swing over until the entire length of one wall lies flat along the
lever, the momentum acquired by the hammer however causes a slight reversal of
the movement of the lever as the hammer swings beyond its position of rest to
reach the bell. Thus the parts may be mounted rigidly as the clearance necessary
between the hammer and the bell is passed not by the yield or give of the
various parts but by a slight return movement of the lever. The lever being
released by the operator is returned by the spring and the action is repeated in the
opposite direction.
It is manifestly possible to substitute four studs or other equivalent for the
"walls
"above described, or to have walls or studs upon the lever and a bar
across the pivotal portion of the hammer, or the hammer may hang vertically from
the crown of bell and the lever be worked at right angles or otherwise.
For attachment to cycles a fastening is constructed as follows: Across the base
plate or its equivalent runs a thickening ridge, which may be cut with transverse
notches, in one of these a wire is laid which after encircling a portion of the cycle
is jointed to a bar which terminates in a socket at the further side of the base
plate, near the joint the bar is penetrated by a screw which depends from the
base plate, a nut upon the screw enables the bar to be drawn in the direction of
the base plate and so causes the wire to be drawn as tightly as required-the action
being similar to a vice.
A flat band may be used instead of the wire by letting the depending screw
pass through a hole in the band (various holes being made for adjustment) and
curling the outer end of band round a pin through the bar.
Referring to the accompanying drawings, similar letters indicate like parts
throughout;
"
upon
Fig. 1 shows the interior mechanism of the alarm, the bell being indicated
by the lines A; B is the bridge for carrying the bell, rising from the base
plate C D is the hammer, E is the pivot of same, F F are the "walls
the hammer-between which works the lever G, the finger piece projecting beyond
the bell is marked G', H is the fulcrum of lever: J is a flat spring, one end of
which rests in a notch in the lever and the other end presses against the bridge.
Fig. 4 shows the elevation of alarm, A is the bell, and A' is the fixing screw;
B is the bridge C is the base plate, and C is the thickening ridge; D is the
hammer, and FF are the "walls" thereof; G. G¹ is the lever; J is the spring,
Kis the band for attachment to part of cycle (marked O) K' K2 K3 are holes in
the band through which the central screw L passes, according to the length of
band required.
:

page_text: Thus it will be seen that on the finger piece being pulled, the opposite end of
lever presses against the end of "wall" on the hammer marked F', and turning
it upon the pivot E swings the hammer until that wall lies flat along the lever, in
this position the hammer is just clear of the bell, but a blow is delivered because
the momentum of the hammer causes the other end of the wall on coming in
contact with the lever to slightly reverse the direction of the movement of the
lever, and this enables the hammer to reach the bell-there is therefore no
"spring or "give" necessary in the various parts. The spring J being deflected
when the lever is pulled, it will, when the lever is released, return it to the position
shown.
"
Fig. 2 shows the alarm reversed; C is the base; G₁ is the lever; K is the
band around part of cycle O; L is the screw which depends through the centre
of base plate; M is the clamping bar with one end resting in a hole in base plate
at N, and penetrated at P by the screw L; Q is the nut for tightening band;
R is the rivet around which the end of the band is curled and fixed.
Fig. 3 shows the side elevation of the band fastening; C is the base, and C¹ is
the thickening ridge; K is the band which is placed on the screw L and after
encircling part of the cycle is curled around the rivet R which passes through
the bar M.
It is apparent that on the nut Q being screwed towards the base plate the bar
is forced in the same direction (after the manner of the jaw of a vice) and thus
draws the band tightly around O; one end of the bar M resting in the hole N
prevents the entire fastening revolving upon the screw.
The several parts are subject to certain modifications to meet special require-
ments but not shown in the drawings-without departing from the principles
involved in this invention.
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. Mechanism for alarm bells constructed substantially as set forth, and shown
in figures marked 1 and 4 in the drawings.
2. Fastenings or attachments for alarm bells constructed substantially as set
forth, and shown in Figures 2 and 3 in the drawings.
Dated the 9th day of February 1894.
C. E. CHALLIS.