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Publication numberUS1345767 A
Publication typeGrant
Publication dateJul 6, 1920
Filing dateFeb 7, 1920
Priority dateFeb 7, 1920
Publication numberUS 1345767 A, US 1345767A, US-A-1345767, US1345767 A, US1345767A
InventorsLaurens Hammond
Original AssigneeLaurens Hammond
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method and apparatus for indicating heat
US 1345767 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

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Be it known that I, LAURENS HAMMOND, a citizen of the United States, residing at Detroit, county of Wayne, State of Michian, have invented a certain new and useful Improvement in Methods and Apparatus for Indicating Heat, and declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to; which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to method of and apparatus for detecting Whether or not an engine or other mechanism has been, heated tocor above a certain temperature.

The object is to provide a means to determine whether or not an engine .or other mechanism has been allowed to overheat or has been heated to or above a certain temperature. Said means is adapted to record this fact in such a fashion that after such action has taken place it can be determined whether or not such temperature point has been reached or passed.

In the--drawings- Figure 1 is a perspective of a portion of an engine with my device attached thereto. a

Fig. 2 is an elevation of my device as affixed.

Fig. 3 is a sectional elevation of my device in place. I i

Fig. 4. is a sectional view of. a modification of my device.

Let 6; represent an engine structure and I) my metal stamp or seal affixed thereto, the

surface or face of this seal or stamp being configured according to any desired design or in any determined fashion. The inscription appearing on the surface of the seal may very Well be the name of the company manufacturing the goods to which the seal is to be afiixed. This inscription or legend is here indicated by the letter 0.

For the purposes hereinafter set forth,

1 this inscription appearing on the surface of the seal will be contoured or shaped from the material of the seal itself rather than being imprinted or impressed thereon. The seal may be affixed to the engine in any desired manner, as shown in Fig. 4. A boss, as at d, may be formed on the Wall of the engine, then the same is spot-drilled as at i, so as to provide a recess to receive this seal and retain it in place.

Specification of Letters Patent.

Patented July 6,1920.

Application filed February 7, 1926. Serial No. 356,999.

Engines and other mechanism and par-- ticularly internal combustion engines are frequently allowed to overheat, due either to carelessness, oversight, imperfect cooling due to a number of causes, et cetera. Consequently the engine is damaged, if not ruined. In the service of motor companies, it is frequently found that engines and parts are returned for replacement Where the fault is obviously not due to a defect in (ill structure or manufacture, but which fact is difficult to prove. The present seal is designed to meet this need. It is. permanently affixed to the engine wall and the engine manufacturers name, trade-mark, or other distinguishing mark is configured on the face thereof. When the temperature of the engine rises above a certain point, the metal of the. seal fuses to an extent sufficient to partially, if not completely, obliterate this mark. v

, This aifords a certain means for detecting whether or, not the engine has been allowed to heat to or above such temperature pointi It is apparent that these seals might be of infinite variety, composed of various materials, aflixed to the engine in very many dif-' ferent ways and in a number of difierent places. These particulars are each andall of little importance as hearing uponthe spirit of the invention.

The process of detecting whether or not an engine, or other mechanism has been heated to or above a certain temperature is therefore broadly the scope of this invention. This process consists in affixing to an engine a seal 2) bearing on its face a configuration,such seal being composed of a substance adapted to fuse sufficiently to partially, if not completely, eiface said configuration at a point substantially near the boiling point of water, such point being at least. substantially lower than the fusing point of the engine structure itself.


1. The process ofdetecting whether or not an engine has been heated to a certain temperature by afiixing thereto a configured stamp formed of such material that when the engine has been heated to such temperature the stamp will fuse sufficiently to obliterate the configuration thereon so as to indicate such fact.

2. A seal adapted to be afiixed to an engine, said seal bearing on its face, an inscription, and being composed of a material adapted to fuse sufficiently to substantially erase said inscription at a temperature which would injure the engine.

3. A' manufacturers name-plate adapted LAURENS HAMMOND.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2503593 *Apr 23, 1945Apr 11, 1950Railway Service And Supply CorMeans for determining and recording whether or not a railway axle crown bearing has been operated at a predetermined critical temperature
US5482000 *Jun 15, 1994Jan 9, 1996Patent Master, Inc.Surface mount overheat indicator with projecting fusible disk
US5954010 *Sep 19, 1996Sep 21, 1999Lucent Technologies Inc.Temperature sensing device for permanently indicating when a product is exposed to critical temperatures
US6957693Dec 12, 2003Oct 25, 2005Honeywell International, Inc.Heat exchanger thermal indicator
US7864022 *Mar 7, 2008Jan 4, 2011S&C Electric CompanyWear indicator for a circuit interrupter exhaust control device
US20050126751 *Dec 12, 2003Jun 16, 2005Smith Willi J.Heat exchanger thermal indicator
US20080217298 *Mar 7, 2008Sep 11, 2008S & C Electric Co.Wear Indicator for a Circuit Interrupter Exhaust Control Device
U.S. Classification116/217, 116/201
International ClassificationF02B77/08
Cooperative ClassificationF02B77/089
European ClassificationF02B77/08K