US983443A - Electrical alarm-thermometer. - Google Patents

Description

v R. HEDDLE.

ELECTRICAL ALARM THERMOMETER. APPLICATION FILED JUNE 21, 1909.

UNrrED STATES ROBERT HEDDLE, OF NELSON,

PATENT OFFICE.

BRITIH COLUMBIA, CANADA.

4 ELECTRICAL ALARMTTHERMOMETER. j

To all whmn 'itmay concern:

Be it known that I, ROBERT HEnpLE, a subject of the King of Great Britain, resid ing at Nelson, British Columbia, Canada, have invented certain new and useful Improvements in Electrical Alarm-Thermoma ters; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make ahd use the same. p

1 My invention relates ters.

The object of the invention is to provide a unitary structure which may be transported from place to place without breaking any connections or making any adjustments and which will act at certain predetermined temperatures to give an alarm.

- A still further object of the invention is the provision of means whereby a thermometer alarm may be adjusted to act at different temperatures of heat or-.cold. For instance, if it is desired to keep a room within certain degrees of temperature, the device may be set so that when'either one ofthe extremes of heat or cold is reached on the limit set, an alarm will be given to notify the occupants of the room of the temperature condition of atmospherefitherein.

With these and other objects in View, the invention consists of certain. novel features of construction, combination and arrangement of parts as will be more fully describedand particularly pointed "out in the apn pended claim.

In the drawings, Figure 1 is a front elevation of the device; Fig. 2 is a side eleva tion thereof witlfthe casing removed so as to clearly show the inner portion of the thermometer, parts being shown in section; and- Fig. 3 is a horizontal sectional view taken" on "the line 3-3 of Fig. 1. m u ally to the drawing, 1 represents a suitable casing which? is.

Referring more especi adapted to be suspended upon'a' wallo'r other suitable support by'an 'eye' piece 2 secured to the upper rear end of the casing-- The interior portion ofthe casing as defined by the back 3, front 4 and bottom 5,v is occu-' pied by the battery 6 which rests upon the bottom and'by the magnet coils of the ringer R. The gen post of this ringer projects I through the ront plate 4 of the casing and.

has a gong plate G secured thereto.

to thermometers and particularly to electrical alarm thermomeits bottonn'is a slotted screw bolt 7, adapted .to receive the thermostat 8, which in this instance is shown to be a pair of metallic bars riveted together, which have difierent coefficients of expansion. Under normal conditions or with the thermostat subjected to medium temperatures, it remains in the vertical position parallel-with the side edges .of the front plate 4.

Immediat elypbove the upper end of the thermostat, there is secured to the front plate 4, a pivoting frame 9, which is provided with a pair of cupped adjusting screws 10, adapted to receive an indicator pivot, 11, upon which the indicator 12, is carried. This indicator extends downwardly in frontof the thermostat 8, and has its pointed end 13, adapted to'travel over a graduated scale 14, which is perfectly insulated so as to pre-' vent electrical connection between the same and the indicator 12; In the upper portion of the indicator, immediately below its pivotal section, there is provided a slot 15, adapted to be engaged by a laterally extending pin 16, carried upon the upper end of the thermostat and immediately above the pivotal section of the indicator, is provided a'balanc e weight 17. I

. The lower end of the graduated scale 14, is secured to the front'plate 4 by screws 18 and 19, the latter of which forms a terminal for the conductor 20, from one pole of the battery 6 and is adapted to engage the exposed metallic portion of the scale and thereby forms electrical communication with their upper contacting portions. The screws 18 and 19, are of course insulated from the scale 14, and current onlyflows tothe scale when the switch 21, which is in electrical contact with the scale is resting upon the terminal, screw 19, which is connected, as shown, by wayof conductor 20 to the battery, One terminal. of the ringer is.connected to the set screw 7,.by vway of wire 25 andthe opposite ringer terminal .is connected-to the battery by wire 26. When the switch arm 21, is in engagement Withthe contact screw'19, and the indicator hand 12,

is m contactwith one of the slidable contacts 22 or23, the circuit from battery is as foltact 22 or 23, indicator finger 12, thermostat -8, screw 7, to the ringer R, over the conductor'25, and back to battery over wire 26'.

Passing through'the front plate adjacent Specification of Letters Patent. Patented Feb. 7, 1911'. App1ication filed June 21, 1909. Serial No. 503,499.

lows: wire 20, screw 19, scale 14, eithercon- Thusthe ringer iscaused to operate 'to indicate that the temperature either too cold ortoo warm.

From the foregoing description taken in of the room is connection with the accompanying draw havin an indicator rovided with a pointed end w ich is adapt to engage either of the sliding contacts when the thermostat is operated, said indicator having an elongated slot near the upper end ada tedto be engaged by the laterally extended pin, a battery carried by said casing, a ringer also carelectrical connecried by the casing having tion with said battery and contact, and "a switch in the circuits carried by the scale.

In testimony whereof I have hereunto set. my hand in presence of two subscribing witnesses.

' ROBERT HEDDLE.

\Vitnesse's: I v

A LOUISE A. ALmsoN, EDWARD A. GREASE.

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