US3851149A - Electrical heating cable with indicator light and manual test device - Google Patents

Electrical heating cable with indicator light and manual test device Download PDF

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US3851149A
US3851149A US00420263A US42026373A US3851149A US 3851149 A US3851149 A US 3851149A US 00420263 A US00420263 A US 00420263A US 42026373 A US42026373 A US 42026373A US 3851149 A US3851149 A US 3851149A
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Prior art keywords
thermostat
test device
heating cable
envelope
conductor
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US00420263A
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W Daley
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Easy Heat Inc
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SMITH GATES CORP
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Assigned to SMITH-GATES CORPORATION, THE reassignment SMITH-GATES CORPORATION, THE MERGER (SEE DOCUMENT FOR DETAILS). EFFECTIVE ON 12/30/1988 DELAWARE Assignors: HOLDINGATES, INC. (CHANGED TO), SMITH-GATES CORPORATION, THE, A CORPORATION OF DE (MERGED INTO)
Assigned to EASY HEAT, INC. AN IN CORPORATION reassignment EASY HEAT, INC. AN IN CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). EFFECTIVE ON 04/23/1991 DELAWARE Assignors: SMITH-GATES CORPORATION, THE, A CORPORATION OF DE
Assigned to SMITH-GATES CORPORATION, THE A CORPORATION OF DE reassignment SMITH-GATES CORPORATION, THE A CORPORATION OF DE MERGER (SEE DOCUMENT FOR DETAILS). EFFECTIVE ON 01/06/1989 DELAWARE Assignors: FEDERAL ACQUISITION CORP., A CORPORATION OF DE (CHANGED TO), SMITH-GATES CORPORATION, THE, A CORPORATION OF DE (MERGED INTO)
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/54—Heating elements having the shape of rods or tubes flexible
    • H05B3/56—Heating cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/02—Bases, casings, or covers
    • H01H9/0214—Hand-held casings
    • H01H9/0228—Line cord switches

Definitions

  • a cold lead extends to the cable and a thermostat is interposed between the cold lead and the cable with a translucent and flexible envelope thereabout.
  • a small indicator light within a second translucent envelope is connected in parallel with the heating cable and operates to reflect visually operation of the thermostat.
  • a test device in the first envelope comprises a small spring metal conductor connected at one end with one thermostat terminal and having an opposite end movable toward and away from a second thermostat terminal. Manual deflection of the envelope against the conductor urges the same into contact with the terminal whereby to close the circuit for testing of the heating cable and release of manual pressure opens the circuit.
  • an electrical resistance heating cable is indicated generally at 10.
  • the cable takes a tape-like form in cross section with electrieal resistance heating element 12 disposed therewithin and a flexible insulator 14 forming the sheath or outer portion thereof. Both the resistance heating element and the insulator 14 are elongated and of indeterminant length extending from a substantially translucent first envelope 16.
  • the cable or tape may obviously be woundconveniently in a spiral configuration about a water pipe subject to freezing temperatures, embedded in seed beds, etc.
  • the translucent envelope 16 takes a pillow configuration and is preferably heat sealed at end portions 18, about and in engage- .ment with the cable 10 and other elements.
  • a cold lead 22, 24 is captured within the heat sealed area and extends therefrom to a conventional electrical plug 26, FIG. 1.
  • the right-hand heat sealed area 20 captures, in addition to the heating cable 10, first and "second electrical conductors 28, 30 which extend from clips 32, 34 to a second substantially translucent envelope 36, best illustrated in FIG. 1.
  • The'clips 32, 34 serve respectively to connect the conductors 28. and an associated 'endportion of resistance element 12 with the cold lead 22 and, to connect the conductor 30 and associated opposite end portion of resistance element cent envelope 36 by means of the conductors 28, 30.
  • the thermostat 40 may be of a conventional construction and operates to energize the heating element 7 12 below a predetermined temperature whereby to prevent-freezing of water pipes or to effect heating of the element 12 for other end purposes.
  • the thermostat 40 has at least one exposed terminal and, left and right-hand or first and second ex posed terminals are shown.
  • the left-hand terminal 42 is exposed for a purpose to be set forth hereinhelow and the aforementionedterminal 38 may also be-cxposed.
  • the cold lead 24 is connected with the left-hand terminal 42 by means of a suitable clip 44.
  • a test device incorporated in the heating cable assembly of the present invention is preferably manually operable and may comprise a spring metal conductor as illustrated at 46.
  • the spring metal conductor 46 has a right-hand portion 48 connected with the thermostat terminal 38 and a left-hand portion 50 normally in spaced relationshipwith the thermostat terminal 42.
  • An intermediate portion of the conductor 46 can be urged downwardly as illustrated by broken line 52 in FIG. 2 whereby to make contactbetween the exposed terminal 42 and the portion'50 and to complete a circuit in parallel with the thermostat 40.
  • the intermediate portion of the spring metal conductor 46 is urged downwardly by manual depression of the translucent envelope 16, illustrated by broken line 54.
  • the heating cable 10 may be wrapped about a water pipe, the plug 26 insertedin a suitable receptacle for a supply of electrical power and the heating cable assembly will thereafter operate automatically to prevent freezing of water in apipe.
  • the thermostat 40 will serve to energize the heating element 12 when ambient temperature drops below a predetermined level and to de-energize the heating element when the ambient temperature exceeds such level.
  • the thermostat closes the circuit to energize the heating element, it also energizes the indicator or pilot lamp 42 and an observer can readily determine visually the closed or operative condition of the thermostat.
  • the indicator or pilot light 42 When the indicator or pilot light 42 is de-energized, the observer is advised of the open or inoperative condition of the thermostat.
  • the conductors or leads 28, 30 for the indicator or pilot light 42 permit the orientation or positioning of the pilot light externally of insulation wrapping which may be placed about the heating cable 10 on a water pipe. This of course permits a convenient visual inspection of the heating cable assembly for operability.
  • the plug 26 may be introduced to a convenient receptacle and the test device 46 may thereafter be manually depressed as indicated in FIG. 2 in the broken line condition whereby to engage the portion 50 of the test device with the exposed thennostat terminal 42.
  • a parallel circuit is thus completed and the indicator light 42 will be energized to advise an observer as to the availability of electrical power.
  • the resistance elel2 toa terminal 38 on a thermostat 40.
  • the resistance heating element 12 is connected in parallel with pilot or indicator means or lamp 42 within the translu- I claim:
  • An electrical heating cable assembly comprising:
  • a relatively thin, flexible heating cable including an elongated electrically conductive resistance heating element embedded in an elongated flexible insulator;
  • thermostat electrically connected adjacent said heating element for controlling energization of the latter and having at least one exposed terminal;
  • visual indicating means comprising a small indicator light enclosed within a substantially translucent indicator envelope
  • said visual indicating means being electrically connected to said thermostat and heating element and operable on closing of said thermostat for indicating energization of said heating element;
  • test device electrically connected in parallel with said thermostat and operable manually to energize temporarily said heating element and indicating means
  • test device comprising a movable metal conductor electrically connected at one end with one side of said thermostat and having its other end disposed adjacent said exposed terminal,
  • said translucent envelope has at least one flexible wall disposed adjacent but in spaced relationship with said test device
  • said wall being flexible inwardly on the application of manually applied pressure for operation of said test device as aforesaid.

Abstract

An elongated flexible electrical resistance heating cable adapted to be wrapped about water pipes and for other similar uses. A cold lead extends to the cable and a thermostat is interposed between the cold lead and the cable with a translucent and flexible envelope thereabout. A small indicator light within a second translucent envelope is connected in parallel with the heating cable and operates to reflect visually operation of the thermostat. A test device in the first envelope comprises a small spring metal conductor connected at one end with one thermostat terminal and having an opposite end movable toward and away from a second thermostat terminal. Manual deflection of the envelope against the conductor urges the same into contact with the terminal whereby to close the circuit for testing of the heating cable and release of manual pressure opens the circuit.

Description

United States Patent [191 Daley I NOV. 26, 1974 ELECTRICAL HEATING CABLE WITH INDICATOR LIGHT AND MANUAL TEST DEVICE [75] Inventor: William Carmen Daley, West Hartford, Conn.
[73] Assignee: Smith-Gates Corporation,
Farmington, Conn.
[22] Filed:
Nov. 29, 1973 21 Appl. No.: 420,263
52 user 219/528, 200/168 0,219/506, 219/535, 340/252 P 511 lnt.Cl. H05b3/36, H05b 3/56 [58] Field of Search 200/168 G; 219/528, 506, 219/535, 549; 338/214; 340/252 R, 252 H,
[56] References Cited UNITED STATES PATENTS 2,696,607 12/1954 Witkin 340/252 P 2,752,463. 6/1956 Staak 2,824,209 2/1958 Leipold 2,977,456 3/1961 Stiebel 200/168 G 3,246,] 12 4/1966 200/168 G Adams et a1 3,305,668 2/1967 Smith 219/528 Primary Examiner-Volodymyr Y. Mayewsky Attorney, Agent, or Firm-McCormick, Paulding and Huber [5 7] ABSTRACT An elongated flexible electrical resistance heating cable adapted to be wrapped about water pipes and for other similar uses. A cold lead extends to the cable and a thermostat is interposed between the cold lead and the cable with a translucent and flexible envelope thereabout. A small indicator light within a second translucent envelope is connected in parallel with the heating cable and operates to reflect visually operation of the thermostat. A test device in the first envelope comprises a small spring metal conductor connected at one end with one thermostat terminal and having an opposite end movable toward and away from a second thermostat terminal. Manual deflection of the envelope against the conductor urges the same into contact with the terminal whereby to close the circuit for testing of the heating cable and release of manual pressure opens the circuit.
3 Claims, 3 Drawing Figures E E T ICAL HEATING CABLE WITH INDICATOR LIGHT AN MANUAL TEST DEVICE BACKGROUND OF THE INVENTION Electrical heating cables of the resistance type have been .available heretofore and have proven generally satisfactory. A convenient determination of availability of electricalpower, operability of the thermostat, and operability of the resistance heating element has not, however, been possible with such heating cables, the cables often being disposed about water pipes beneath house trailers andin other inaccessible locations.
- SUMMARY OF THE INVENTION It is the. general object of the present invention to provide an electrical resistance heating cable of the type mentioned wherein provision is madefor the convenient visual indication of the availability of electrical power supply, operability of a thermostat, and wherein the operability of the resistance heating element may be readily ascertained.
BRIEF DESCRIPTION OF THE DRAWINGS DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS Referring particularly to FIG. 1', an electrical resistance heating cable is indicated generally at 10. The cable takes a tape-like form in cross section with electrieal resistance heating element 12 disposed therewithin and a flexible insulator 14 forming the sheath or outer portion thereof. Both the resistance heating element and the insulator 14 are elongated and of indeterminant length extending from a substantially translucent first envelope 16. The cable or tape may obviously be woundconveniently in a spiral configuration about a water pipe subject to freezing temperatures, embedded in seed beds, etc.
The translucent envelope 16, as best illustrated in FIG. 2, takes a pillow configuration and is preferably heat sealed at end portions 18, about and in engage- .ment with the cable 10 and other elements. In FIG. 3, and at the left-hand heat sealed area 18 in particular, a cold lead 22, 24 is captured within the heat sealed area and extends therefrom to a conventional electrical plug 26, FIG. 1. The right-hand heat sealed area 20 captures, in addition to the heating cable 10, first and "second electrical conductors 28, 30 which extend from clips 32, 34 to a second substantially translucent envelope 36, best illustrated in FIG. 1. The'clips 32, 34 serve respectively to connect the conductors 28. and an associated 'endportion of resistance element 12 with the cold lead 22 and, to connect the conductor 30 and associated opposite end portion of resistance element cent envelope 36 by means of the conductors 28, 30.
The thermostat 40 may be of a conventional construction and operates to energize the heating element 7 12 below a predetermined temperature whereby to prevent-freezing of water pipes or to effect heating of the element 12 for other end purposes. Preferably and as shown, the thermostat 40 has at least one exposed terminal and, left and right-hand or first and second ex posed terminals are shown. The left-hand terminal 42 is exposed for a purpose to be set forth hereinhelow and the aforementionedterminal 38 may also be-cxposed. The cold lead 24 is connected with the left-hand terminal 42 by means of a suitable clip 44.
A test device incorporated in the heating cable assembly of the present invention is preferably manually operable and may comprise a spring metal conductor as illustrated at 46. The spring metal conductor 46 has a right-hand portion 48 connected with the thermostat terminal 38 and a left-hand portion 50 normally in spaced relationshipwith the thermostat terminal 42. An intermediate portion of the conductor 46 can be urged downwardly as illustrated by broken line 52 in FIG. 2 whereby to make contactbetween the exposed terminal 42 and the portion'50 and to complete a circuit in parallel with the thermostat 40. As best illustrated in FIG. 2, the intermediate portion of the spring metal conductor 46 is urged downwardly by manual depression of the translucent envelope 16, illustrated by broken line 54.
From the foregoing, it will be apparent that the heating cable 10 may be wrapped about a water pipe, the plug 26 insertedin a suitable receptacle for a supply of electrical power and the heating cable assembly will thereafter operate automatically to prevent freezing of water in apipe. The thermostat 40 will serve to energize the heating element 12 when ambient temperature drops below a predetermined level and to de-energize the heating element when the ambient temperature exceeds such level. When the thermostat closes the circuit to energize the heating element, it also energizes the indicator or pilot lamp 42 and an observer can readily determine visually the closed or operative condition of the thermostat. When the indicator or pilot light 42 is de-energized, the observer is advised of the open or inoperative condition of the thermostat. The conductors or leads 28, 30 for the indicator or pilot light 42 permit the orientation or positioning of the pilot light externally of insulation wrapping which may be placed about the heating cable 10 on a water pipe. This of course permits a convenient visual inspection of the heating cable assembly for operability.
In testing operation of the heating cable assembly, the plug 26 may be introduced to a convenient receptacle and the test device 46 may thereafter be manually depressed as indicated in FIG. 2 in the broken line condition whereby to engage the portion 50 of the test device with the exposed thennostat terminal 42. A parallel circuit is thus completed and the indicator light 42 will be energized to advise an observer as to the availability of electrical power. Further, the resistance elel2 toa terminal 38 on a thermostat 40. Thus, the resistance heating element 12 is connected in parallel with pilot or indicator means or lamp 42 within the translu- I claim:
I. An electrical heating cable assembly comprising:
a relatively thin, flexible heating cable including an elongated electrically conductive resistance heating element embedded in an elongated flexible insulator;
a thermostat electrically connected adjacent said heating element for controlling energization of the latter and having at least one exposed terminal;
visual indicating means comprising a small indicator light enclosed within a substantially translucent indicator envelope,
said visual indicating means being electrically connected to said thermostat and heating element and operable on closing of said thermostat for indicating energization of said heating element;
a test device electrically connected in parallel with said thermostat and operable manually to energize temporarily said heating element and indicating means,
and a substantially translucent envelope disposed about said thermostat and test device,
said test device comprising a movable metal conductor electrically connected at one end with one side of said thermostat and having its other end disposed adjacent said exposed terminal,
said other end of said conductor being normally spaced from said exposed terminal to open a circuit parallel with said thermostat,
and said other end of said conductor being urged into contact with said exposed terminal to complete said parallel circuit on the application of manual pressure to an intermediate portion of the conductor via said translucent envelope.
2. An electrical heating cable as set forth in claim 1 wherein;
said translucent envelope has at least one flexible wall disposed adjacent but in spaced relationship with said test device,
said wall being flexible inwardly on the application of manually applied pressure for operation of said test device as aforesaid.
3. An electrical heating cable as set forth in claim 1 wherein said conductor is of a spring metal construction and flexibly movable.

Claims (3)

1. An electrical heating cable assembly comprising: a relatively thin, flexible heating cable including an elongated electrically conductive resistance heating element embedded in an elongated flexible insulator; a thermostat electrically connected adjacent said heating element for controlling energization of the latter and having at least one exposed terminal; visual indicating means comprising a small indicator light enclosed within a substantially translucent indicator envelope, said visual indicating means being electrically connected to said thermostat and heating element and operable on closing of said thermostat for indicating energization of said heating element; a test device electrically connected in parallel with said thermostat and operable manually to energize temporarily said heating element and indicating means, and a substantially translucent envelope disposed about said thermostat and test device, said test device comprising a movable metal conductor electrically connected at one end with one side of said thermostat and having its other end disposed adjacent said exposed terminal, said other end of said conductor being normally spaced from said exposed terminal to open a circuit parallel with said thermostat, and said other end of said conductor being urged into contact with said exposed terminal to complete said parallel circuit on the application of manual pressure to an intermediate portion of the conductor via said translucent envelope.
2. An electrical heating cable as set forth in claim 1 wherein; said translucent envelope has at least one flexible wall disposed adjacent but in spaced relationship with said test device, said wall being flexible inwardly on the application of manually applied pressure for operation of said test device as aforesaid.
3. An electrical heating cable as set forth in claim 1 wherein said conductor is of a spring metal construction and flexibly movable.
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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4025755A (en) * 1975-11-11 1977-05-24 Wrap-On Company, Inc. Thermostatic electric cable heater
US4066870A (en) * 1976-12-06 1978-01-03 Bristol Products, Inc. Flexible electric heating cable
US4419569A (en) * 1979-03-26 1983-12-06 Bristol Corporation Modular heating cable assembly
US4545375A (en) * 1983-06-10 1985-10-08 Aspen Laboratories, Inc. Electrosurgical instrument
US4650971A (en) * 1983-10-24 1987-03-17 Pgm, Inc. Energization indicator and method for heat trace cable and the like
US5920191A (en) * 1997-11-12 1999-07-06 Wrap-On Company, Inc. Current flow monitor for heating cables
US5933574A (en) * 1998-02-09 1999-08-03 Avansino; Gary L. Heated fluid conduit
US6072152A (en) * 1994-11-16 2000-06-06 Fleetheet Llc Heater control device
US20050247480A1 (en) * 2004-05-04 2005-11-10 Schulz Steven M Self winding electric cord
US20070075071A1 (en) * 2005-09-30 2007-04-05 Cardenas Carlos A Pipe heater
US9816680B2 (en) 2014-06-05 2017-11-14 Pentair Thermal Management Llc Lighted cable termination device having expanded viewing area
US10020623B1 (en) 2017-03-15 2018-07-10 Hughie Meehan Electrical circuit jumper cable assembly for testing
US10135212B2 (en) 2016-10-19 2018-11-20 Hughie Meehan Electric circuit jumper with coupling
USD843625S1 (en) 2014-06-05 2019-03-19 Nvent Services Gmbh Lighted cable termination assembly

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2696607A (en) * 1952-07-16 1954-12-07 Leon C Witkin Circuit control and indicator
US2752463A (en) * 1955-02-03 1956-06-26 Gen Electric Switch
US2824209A (en) * 1956-07-20 1958-02-18 Welcraft Products Co Inc Strip heater
US2977456A (en) * 1959-05-13 1961-03-28 Theodor H Stiebel Miniature immersion heaters with watertight handles enclosing switching means
US3246112A (en) * 1964-04-06 1966-04-12 Donald R Adams Polypropylene diaphragm assemblies
US3305668A (en) * 1964-08-27 1967-02-21 David C Smith Cable heater

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2696607A (en) * 1952-07-16 1954-12-07 Leon C Witkin Circuit control and indicator
US2752463A (en) * 1955-02-03 1956-06-26 Gen Electric Switch
US2824209A (en) * 1956-07-20 1958-02-18 Welcraft Products Co Inc Strip heater
US2977456A (en) * 1959-05-13 1961-03-28 Theodor H Stiebel Miniature immersion heaters with watertight handles enclosing switching means
US3246112A (en) * 1964-04-06 1966-04-12 Donald R Adams Polypropylene diaphragm assemblies
US3305668A (en) * 1964-08-27 1967-02-21 David C Smith Cable heater

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4025755A (en) * 1975-11-11 1977-05-24 Wrap-On Company, Inc. Thermostatic electric cable heater
US4066870A (en) * 1976-12-06 1978-01-03 Bristol Products, Inc. Flexible electric heating cable
US4419569A (en) * 1979-03-26 1983-12-06 Bristol Corporation Modular heating cable assembly
US4545375A (en) * 1983-06-10 1985-10-08 Aspen Laboratories, Inc. Electrosurgical instrument
US4650971A (en) * 1983-10-24 1987-03-17 Pgm, Inc. Energization indicator and method for heat trace cable and the like
US6072152A (en) * 1994-11-16 2000-06-06 Fleetheet Llc Heater control device
US5920191A (en) * 1997-11-12 1999-07-06 Wrap-On Company, Inc. Current flow monitor for heating cables
US5933574A (en) * 1998-02-09 1999-08-03 Avansino; Gary L. Heated fluid conduit
US20050247480A1 (en) * 2004-05-04 2005-11-10 Schulz Steven M Self winding electric cord
US20070075071A1 (en) * 2005-09-30 2007-04-05 Cardenas Carlos A Pipe heater
US7220947B2 (en) 2005-09-30 2007-05-22 Global Heating Solutions, Inc. Pipe heater
USD931514S1 (en) 2014-06-05 2021-09-21 Nvent Services Gmbh Lighted cable termination assembly
USD843625S1 (en) 2014-06-05 2019-03-19 Nvent Services Gmbh Lighted cable termination assembly
US10371348B2 (en) 2014-06-05 2019-08-06 Nvent Services Gmbh Pipe-mounted cable termination assembly providing illumination visible from underside of pipe
USD897018S1 (en) 2014-06-05 2020-09-22 Nvent Services Gmbh Lighted cable termination assembly
US10859236B2 (en) 2014-06-05 2020-12-08 Nvent Services Gmbh High visibility termination system and method
US9816680B2 (en) 2014-06-05 2017-11-14 Pentair Thermal Management Llc Lighted cable termination device having expanded viewing area
USD933869S1 (en) 2014-06-05 2021-10-19 Nvent Services Gmbh Lighted cable termination assembly
USD936261S1 (en) 2014-06-05 2021-11-16 Nvent Services Gmbh Lighted cable termination assembly
USD938636S1 (en) 2014-06-05 2021-12-14 Nvent Services Gmbh Lighted cable termination assembly
US11236886B2 (en) 2014-06-05 2022-02-01 Nvent Services Gmbh High visibility termination system and method
USD992186S1 (en) 2014-06-05 2023-07-11 Nvent Services Gmbh Lighted cable termination assembly
US10135212B2 (en) 2016-10-19 2018-11-20 Hughie Meehan Electric circuit jumper with coupling
US10020623B1 (en) 2017-03-15 2018-07-10 Hughie Meehan Electrical circuit jumper cable assembly for testing

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Owner name: SMITH-GATES CORPORATION, THE

Free format text: MERGER;ASSIGNORS:SMITH-GATES CORPORATION, THE, A CORPORATION OF DE (MERGED INTO);HOLDINGATES, INC. (CHANGED TO);REEL/FRAME:005856/0328

Effective date: 19881229

Owner name: SMITH-GATES CORPORATION, THE A CORPORATION OF DE

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Effective date: 19890104

Owner name: EASY HEAT, INC. AN IN CORPORATION

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Effective date: 19910328