IMPROVEMENTS IN ALARUMS
Year: 1883

page_text: LETTERS PATENT to Alexander Melville Clark of the firm of A. M and
W Clark of 53 Chancery Lane in the County of Middlesex Fellow of the
Institute of Patent Agents for an Invention of IMPROVEMENTS IN ALARUMS
communicated to him from abroad by Cornelius Fred Luquer, of Montgomery
Orange County State of New York, United States of America
PROVISIONAL SPECIFICATION left by the said Alexander Melville Clark at
the Office of the Commissioners of Patents on the 19th November 1883.
ALEXANDER MELVILLE CLARK of the firm of A. M and W. Clark, of 53 Chancery
Lane in the County of Middlesex, Fellow of the Institute of Patent Agents
"IMPROVEMENTS IN ALARUMS." [Communicated to him from abroad by Cornelius
Fred Luquer, of Montgomery Orange County State of New York, United States of
America]
The object of this invention is to provide alarm attachments for clocks,
constructed in such a manner that they will sound an alarm once each day for
eight successive days with one winding up of the spring, so that the alarm
mechanism will require to be wound up only once a week.
The Invention consists in an eight day clock alarum constructed with a dial and
cam connected with the clock work and operating a lever connected by wires with
an arm attached to the pallet of the alarum and with a stop lever arranged to
engage with stop pins attached to the pallet wheel and provided with a follower to
engage with a trip wheel connected with the main wheel driven by a spring.
The pins are attached to the outer part of the side of the pallet wheel at a little
distance apart, and at the same distance from the centre of the said wheel and the
forward end of the lever is widened so that it will engage with either of the stop
pins. This stop lever is pivoted to the frame of the alarum work, and its rear end
is connected by a wire with the drop lever.
To the rear arm of the stop lever is attached a pawl or follower, the free end of
which rests upon the rim of the trip wheel, which is rigidly connected with the
main wheel or its post, and has a notch or re-entrant tooth formed in its rim for
the follower to drop into at each revolution of the said wheel.
-

page_text: The forward side of the notch is square or radial, and its rear side is inclined, so
that the follower will readily pass out of the said notch, as the trip wheel continues
its revolution.
In setting the mechanism, if the alarum is to be sounded within twelve hours
the forward end of the stop lever must be arranged to rest against the second pin
which can be done by moving the alarum dial and the various parts will then be in
the following positions;-the pallet arm is raised causing the pallet to hold the
pallet wheel from revolving, the rear end of the stop lever is raised raising the
follower from the notch and disengaging the forward end of the said lever from
the second pin
With this arrangement at the time for which the alarum was set, the end of the
drop lever drops from the shoulder of the cam releasing the pallet and allowing the
alarm to be sounded. At the same time the follower rides along the rim of
the trip wheel until it reaches and drops into the notch drawing the rear arm of
the stop lever downward and raising the forward end of the said lever into such a
position that the first pin will strike against it stopping the alarm work and
holding it from moving until the cam has raised the drop lever and locked the
pallet which movement has also lowered the inner end of the stop lever out of
engagement with the first pin.
At the end of the next twelve hours the drop lever again drops from the
shoulder of the cam which releases the pallet and at the same time raises the
forward end of the stop lever into the space between the pins so that the said end
will be struck by the second pin and the movement stopped before the alarm has
had time to sound, and until the forward movement of the cam locks the pallet as
before stated and releases the second pin from the lever; the forward movement of
the alarum works from the action of the spring being enough in each case to cause
the return of the forward end of the stop lever to the rear of the pin from the
forward side of which it was last released. At the end of the next twelve hours
when the drop lever drops from the shoulder of the cam the alarum mechanism is
released as before stated, and the alarm is sounded until the main wheel of the
alarum mechanism has made an entire revolution and the forward end of the stop
lever is again raised to meet the first pin

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Alexander Melville Clark in the Patent Office, on the 6th May
1884.
ALEXANDER MELVILLE CLARK of the firm of A. M. and W. Clark of 53 Chancery
Lane, in the County of Middlesex, Fellow of the Institute of Patent Agents.
IMPROVEMENTS IN ALARUMS (a communication to me from abroad by Cornelius
Fred Luquer of Montgomery, Orange County, State of New York, United States³
of America)
The object of this Invention is to provide alarum attachments for clocks,
constructed in such a manner that they will sound an alarum once each day
for eight successive days with one winding up of the spring, so that the alarum
mechanism will require to be wound up only once a week.
The Invention consists in an eight day clock alarum constructed with a dial and
cam connected with the clock work and operating a lever connected by wires with
an arm attached to the pallet and with a lever arranged to engage with stop pins
attached to the pallet wheel, and provided with a follower to engage with a trip
wheel connected with the main wheel driven by a spring as will be hereinafter
fully described
In the accompanying drawings forming part of this Specification similar letters
of reference indicate corresponding parts in both the figures. Figure 1 is a front
elevation of the improvement, part of the frame being removed and showing a part
of the clock dial. Figure 2 is a side elevation of the lower part of the same.
A represents the dial, and B the hands of an ordinary eight day clock. C is the
alarum dial, D is the cam E is the drop lever, F is the pallet-connecting wire, G is.
the pallet arm, H is the pallet. I is the pallet wheel, J is the main wheel K is the
spring, L is the bell hammer, and M is the bell, all of which parts are constructed
and operate in the same manner as in an ordinary alarum, except that the spring K
is made longer than is necessary in a one day alarum.
To the outer part of the side of the pallet wheel I, are attached two pins N, at a
little distance apart, and at the same distance from the centre of the said wheel.
O is the stop lever, the forward end of which is widened so that it will engage
with either of the stop pins N. The stop lever O is pivoted to the frame P of the
alarum work, and its rear end is connected with the drop lever E by the wire Q.
To the rear arm of the stop lever O, is attached a pawl or follower R, the free end
of which rests upon the rim of the trip wheel S. The trip wheel S is rigidly
connected with the main wheel J or its post, and has a notch or reentrant tooth T
formed in its rim for the follower R to drop into at each revolution of the said
wheel S. The forward side of the notch T is concaved and its rear side is inclined,
so that the follower R will readily pass out of the said notch, as the trip wheel S
continues its revolution.
In setting the mechanism, if the alarum is to be sounded within twelve hours
the forward end of the lever O, must be arranged to rest against the second pin N,.
which can be done by moving the alarum dial C, and the various parts will then
be in the following positions;-the arm G is raised causing the pallet H to hold
the wheel I, from revolving, the rear end of the lever 0 is raised, raising the
follower R from the notch T and disengaging the forward end of the said lever O
from the second pin N. With this arrangement at the time for which the alarum
was set, the end of the lever E drops from the shoulder of the cam D, releasing the
pallet H and allowing the alarum to be sounded. At the same time the follower R
rides along the rim of the wheel S until it reaches and drops into the notch T
drawing the rear arm of the lever O downward, and raising the forward end of the

page_text: said lever into such a position that the first pin N will strike against it stopping
the alarum work and holding it from moving until the cam D has raised the lever E
and locked the pallet H which movement has also lowered the inner end of the
lever O, out of engagement with the first pin N.
At the end of the next twelve hours the lever E again drops from the shoulder
of the cam D which releases the pallet H and at the same time raises the forward
end of the lever O, into the space between the pins N, so that the said end will be
struck by the second pin N, and the movement stopped before the alarum has had
time to sound, and until the forward movement of the cam D, locks the pallet H, as
before stated and releases the second pin N from the lever O; the forward
movement of the alarum works from the action of the spring K being enough in
each case to cause the return of the forward end of the lever O to the rear of the
pin N from the forward side of which it was last released. At the end of the next
twelve hours when the lever E drops from the shoulder of the cam D the alarum
mechanism is released as before stated, and the alarum is sounded until the
wheel J has made an entire revolution, and the forward end of the lever O is again
raised to meet the first pin N.
Having described the nature of the said Invention, and the manner of performing
the same, I declare that what I claim as the Invention to be protected by the
herein before in part recited Letters Patent is:-
1 An eight day clock alarum constructed substantially as herein shown and
described and consisting of the dial and cam C, D, the lever E, the connecting wire;
pallet arm, and pallet, F, G, H, the connecting wire and the lever O, having
follower R, the pallet wheel I having the stop pins N, N, the main wheel J, having
trip wheel S and. the spring K as set forth.
2nd In a clock alarum the combination with the drop lever E the pallet wheel I,
and the main wheel J of the connecting wire Q, the lever O, having follower R the
two pins N, and the trip wheel S having notch T, substantially as herein shown
and described, whereby the alarum is made to sound successively each day for a
week with one winding of the alarum spring, as set forth.
In witness whereof I the said Alexander Melville Clark, have hereunto set
my hand and seal this thirtieth day of April A.D. 1884.
A M CLARK (18)