Improvements in Thermometric Alarm Apparatus.
Year: 1896

page_text: Date of Application, 7th May, 1896
Complete Specification Left, 6th Feb., 1897-Accepted, 13th Mar.. 1897
PROVISIONAL SPECIFICATION.
Improvements in Thermometric Alarm Apparatus.
I, JAMES JOSEPH HICKS, of 8 Hatton Garden in the County of London,
Meteorological Instrument Manufacturer, do hereby declare the nature of this
invention to be as follows:-
The invention has for its object a simple arrangement of apparatus whereby
an audible signal can be given on the temperature in the neighbourhood of the
apparatus rising to a given height.
In carrying my invention into effect I employ a thermal or heat expanding bar
which is mounted at one end on a fixed pivot and is formed at the other end with
an inclined face resting against a fixed pin. Thus on the expansion lengthwise
of said bar the inclined end by acting against the fixed pin is caused to move
laterally. A lever mounted on a fixed pin or pivot at its end rests at a short
distance from such fixed pin or pivot against the free end of the thermal bar and
the operating end of said lever which is at a considerable distance from its pivot
is caused to make and break an electric circuit to set in action an electric alarm
apparatus or to liberate the action of a mechanical alarm apparatus which may be
actuated by either a weight or spring.
I mount the parts of the apparatus on a backing of slate, marble, stone or
other non-expansible or slightly expansible material whereby I obtain the full
effect or nearly so of the expansion of the thermal bar and thus avoid the necessity
for any intermediate mechanism between the thermal bar and the lever acting to.
set the alarm in action.
Dated May 7th 1906
HARRIS & MILLS,
23 Southampton Buildings, London, W.C., Agents.
COMPLETE SPECIFICATION.
Improvements in Thermometric Alarm Apparatus.
I, JAMES JOSEPH HICKS, of 8 Hatton Garden, in the County of London,.
Meteorological Instrument Manufacturer, 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 has for its object a simple arrangement of apparatus whereby an
audible signal is given on the temperature in the neighbourhood of the apparatus
rising to a given height.
My invention is illustrated in the accompanying drawing which represents a
thermometric alarm apparatus enclosed in a box capable of being fixed to a wall
or other support, the lid or door of said box being shown open.
In carrying my invention into effect I employ a thermal or heat expanding bar a
which is mounted at one end on a fixed pivot a¹ and is formed at the other end
with an inclined face a which may rest against a fixed pin or as shown in the
drawing against an inclined or curved portion b¹ of the guiding bracket b.
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page_text: Thus on the expansion lengthwise of said bar a the inclined end a² by acting
against the part 6, or against a fixed pin, is caused to move laterally as indicated
by the dotted lines in the drawing.
A lever c mounted on a fixed pin or pivot c¹ rests at a short distance from such
pin c against the free end of the thermal bar a and the operating end of said
lever c which is at a considerable distance from its pivot or pin e may be caused
as will be readily understood to make and break an electric circuit to set in action
an electric alarm apparatus or as shown in the drawings to liberate the action of a
mechanical alarm apparatus which may be of any suitable character and actuated
by either a weight or a spring. In the drawings I have represented an alarm
apparatus actuated by a spring d the alarm being given by a hammer e striking a
bell shown by a dotted circle. Such hammer e is fixed to a pallet lever g
operated by a scape wheel to which motion is given by the spring d, tooth
wheel d¹ and pinion ; a train of wheels gives motion to a fly wheel which is
provided with a tooth or stop ¹ which when resting against the upper end of the
stop lever j arrests the motion of the clockwork. The stop lever j is provided with a
weight which constantly tends to withdraw its upper end from the tooth or
stop but in the normal condition of the apparatus this stop lever j is pressed
forward by the operating end 2 of the lever e into position as shown in the
drawing to come in the way of the tooth or stop i' and thereby stop the motion
of the clockwork. On a given temperature being reached the operating end c² of
the lever c will be removed, by the action of the thermal bar a, from the notched
end of the stop lever i which latter by its weight will then be moved away from
the tooth or stop and liberate the clockwork.
I mount the various parts of the apparatus on a backing k of slate, marble,
stone or other non-expansible or slightly expansible materia! whereby I obtain the
full effect or nearly so of the expansion of the thermal bar a and thus avoid the
necessity for any intermediate mechanism between the thermal bar and the lever
acting to liberate the alarm apparatus or set it in action.
The apparatus is preferably fixed in the interior of a box the bottom and
sides of which are open or formed of perforated metal or metallic gauze to permit
free access of the surrounding air to the interior of the box and consequently to
the alarm apparatus. It is evident that the details of construction may be some-
what varied without departing from the peculiar character of the 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. The improved thermometric alarm apparatus substantially as herein shown
and described.
2. In thermometric alarm apparatus the mounting of the thermal bar and
apparatus on a non-expansible or but slightly expansible support substantially as
herein shown and described and for the purpose stated
3. In thermometric alarm apparatus the combination of a thermal bar pivotted
at one end and provided with an inclined face at the other or free end, a fixed
surface against which such inclined end rests, and a lever mounted on a fixed pin
or pivot at its end and resting at a short distance from the latter on the free end
of the thermal bar, said lever being employed to make and break the circuit of
an electric alarm or to liberate the action of a mechanical alarm substantially as
herein shown and described.
Dated Bobruary 6th 1907
HARRIS & MILLS,
23 Southampton Buildings, Loudon, W.C., Agents.