US782131A - Electric temperature-alarm. - Google Patents

Description

PATENTED FEB. '7, 1905.

C. P. HEPLER.

ELEGTRIG TEMPERATURE ALARM.

APPLIUATION FILED FEB. 20, 1904.

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UNITED STATES Patented February 7, 1905.

OOVVAN PATTERSON HEPLER, OE SMITHTON, PENNSYLVANIA.

ELECTRIC TEIVIFERATUFiE-ALAFNLl SPECIFICATION forming part of Letters Patent No. 782,131, dated February 7, 1905.

Application filed February Z0, 1904. Serial No. 194,507.

T all whom, t may conc/5772,:

Be it known that I, OowAN PATTERSON HEP- LER, a citizen of the United States, and a resident of Smithton, in the county of Testmoreland and State of Pennsylvania, have invented a new and Improved Electric Temperature- Alarm, of which the following is a full, clear, and exact description.

My invention relates to an electric alarm for giving a signal when the contents of a receptacle have reached any certain predetermined temperature.

The objects of my invention are to provide an alarm of the character indicated above which will be adjustable, so that it may be set for any desired temperature, which will be entirely automatic in operation, and which will be useful to a large number of different kinds of manufacturers-for instance, distillers and brewers, bakers, confectioners, zc.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Eigu re 1 is a side view, partly broken away, showing` a tank provided with my invention. Fig. 2 is an enlarged sectional view showing the details of a preferred form of my invention. Fig. 3 is a front view of the same, and

Fig. 4 is a sectional view on the line 1 4. of

Eig. 3.

ln the drawings, t represents a tank containing a boiling liquid or the like.

shows the alarm device proper, c the electric connections from it, and (Z a bell by which the alarm is given.

In detail my alarm device is preferably made with a flattened bulb 1, from which rises a tube 2, lined with an insulating-tubeY sition by means of the set-screw 8. In contact with the collar G is placed a connection 9, provided with a binding-screw 10, to which is attached a wire 11, leading to one of the outside wires c.

Upon the casing of the instrument, which is preferably made of metal, is secured a binding-post 12, which holds a wire 13, which is in connection with the other outside wire c. Upon the upper end of the rod 7 is a projection 1a, which is designed to always be in contact with a scale 15, attached to the back of the casing. The scale 15 is preferably formed of hard rubber and provided with numerals to indicate the temperature at which it is desired to set the instrument. The projection 14 is preferably formed of spring material and is of sufficient length to come into close contact with the scale, so that it will not be easily displaced. lt will be observedv that the rod 7, which is in connection with the parts 6, 9, 10, and 11, is entirely insulated from the casing of the instrument and fromthe receptacle for the mercury. T he casing is preferably provided with a cover 16, secured by thumbscrews 17 and having' a packing' 18.

The operation will be obvious. Vhen the mercury expands suliiciently to reach the rod 7, connections through the wires 11, 12, and c will be made to the bell (Z through a battery v(not shown) and cause the alarm to be given.

The scale will of course be calibrated for the particular use for which the instrument is constructed.

The outside casing parts 1, 2, 1, 6, 7, 9, 10, and 12 should be made of metal, preferably brass.

lt will be obvious that many changes may be made in the construction of the apparatus without departing from the spirit of my invention as set forth in the claims, and l do not wish to be limited to the exact construction shown in the drawings.

Having thus described my invention, l claim as new and desire to secure by Letters Patent 9 5 1. An alarm device comprising' a bulb containing an expansible liquid, a tube extending therefrom, a conducting-rod extending into said tube, a projection lixed to said rod, a scale, means for adjusting said rod to lix the IOO extending` into said receptacle, insulation between said rod and said receptacle, a scale of insulating material, a projection tixedly secured on said rod and adapted to rest on said scale, and means for securing said rod in adjusted positions.

In testimony whereof lhave signed my name to this specification in the presence of two subscribing witnesses.

COWAN PATTERSON HEPLER.

Witnesses:

R. H. WOLF, J. C. SMITH.

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