US3927301A - Electrical heating cartridge - Google Patents

Electrical heating cartridge Download PDF

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Publication number
US3927301A
US3927301A US506888A US50688874A US3927301A US 3927301 A US3927301 A US 3927301A US 506888 A US506888 A US 506888A US 50688874 A US50688874 A US 50688874A US 3927301 A US3927301 A US 3927301A
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US
United States
Prior art keywords
extremity
shell
sleeve
abutments
heating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US506888A
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English (en)
Inventor
Otto Heuel
Heinz Emmerichs
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hasco Hasenclever GmbH and Co KG
Original Assignee
Hasco Normalien Hasenclever GmbH and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hasco Normalien Hasenclever GmbH and Co filed Critical Hasco Normalien Hasenclever GmbH and Co
Application granted granted Critical
Publication of US3927301A publication Critical patent/US3927301A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material
    • 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
    • H05B3/02—Details
    • H05B3/06—Heater elements structurally combined with coupling elements or holders

Definitions

  • a heating cartridge insertable into a bore of a body to be heated comprises a slightly tapering metallic shell whose larger end is cylindrical and carries a thread [56] References Cited coupling sleeve freely rotatable thereon.
  • a coil of re- UNITED STATES PATENTS sistance wire within the shell has turns more widely 1,416,897 5/ 1922 Simon 219/523 spaced at the center than at its ends to provide a more 2,371,696 3/1945 Levitt 338/218 X uniform heating effect.
  • 2,499,961 3/1950 Lennox 338/218 X 2,623,978 12/1952 Cantrell 219/526 x 4 Claims, 4 Drawing Figures sheet 2 012 3,927,301 v US. Patent Dec. 16,1975
  • Heating elements of the type described are commercially obtainable in various versions. They are used in particular where a controlled and localized heating effect is desired, e.g. in the processing of synthetic resins by injection, compression or extrusion.
  • Conventional heating cartridges generally comprise a cylindrical shell, usually of a high-grade alloy steel, enclosing a helical resistance wire serving to convert electrical energy into heat.
  • a threaded coupling at the supply end of the shell enables the heating cartridge to be screwed. into a corresponding threaded bore of the body to be heated.
  • the general object of our invention is to provide an improved heating cartridge in which the aforestated requirements of close fit and good heat transfer are largely satisfied.
  • a more particular object is to provide means in such a cartridge for enabling it to be conveniently secured to any body which is to be heated thereby.
  • the cartridge has a thermally conductive shell whose outer surface deviates from the conventional cylindrical configuration by tapering slightly from a first or bottom end to a second or top end, thereby insuring a secure seating of the shell in a bore of complementary frustoconical shape despite unavoidable manufacturing tolerances.
  • a conicity on the order of 50:] has been found highly satisfactory.
  • a coupling affording the desired flexibility without subjecting the cartridge body to any objectionable stress.
  • a coupling comprises an externally threaded cylindrical sleeve fitted onto a cylindrical extremity of the shell at its bottom end, the sleeve being freely rotatable on that extremity and being held in position by axial abutments such as a pair of split rings or one split ring and a fixed collar or flange on the shell.
  • an annular clearance is left between the inner sleeve surface and the cylindrical surface of the shell extremity to compensate for possible axial disalignments between the coupling sleeve (or its seat in the bore) and the shell (or bore) axis.
  • the free-wheeling of the sleeve on the shell prevents any rotary entrainment of the latter during mounting or extraction of the cartridge and thus avoids frictional damage.
  • FIG. 1 is a somewhat schematic elevational view of our improved heating cartridge inserted into the body of a workpiece
  • FIG. 2 is a similar view of such a cartridge, shown partly in longitudinal section;
  • FIG. 3 is a longitudinal sectional view of the lower extremity of the heating cartridge, drawn to a larger scale and illustrating the mounting of a coupling sleeve;
  • FIG. 4 is a view similar to FIG. 3, showing a modified sleeve mounting.
  • a heating element or cartridge 10 shown in FIGS. 1 and 2, has a slightly frustoconical metallic shell 11 tapering from its bottom end to its top.
  • the shell 1 1 fits closely within a similarly tapering bore 13 of a workpiece body 29 to which the cartridge 10 is attached within bore 13 by means of an externally threaded coupling sleeve 14 as illustrated in FIG. 1.
  • Sleeve 14 is freely rotatable on shell 10 as more fully described below with reference to FIGS. 3 and 4.
  • FIG. 2 shown a pair of leads l5 supplying current to a coil 16 of resistance wire imbedded in an insulating mass 30 within shell 11.
  • the thickness of this shell decreases progressively from its bottom to its top, its inner peripheral wall being of substantially cylindrical shape.
  • Shell 11 could also be of uniform thickness, in which case the space accommodating the coil 16 would be frustoconical.
  • the density of the helicoidal turns of coil 16 varies over its length and is lowest at its longitudinal center, increasing progressively toward both ends. This arrangement is designed to provide more uniform heat distribution along the surface of cartridge 10.
  • Sleeve 14 terminates in a hexagonal head 17, engageable by a wrench, and carries male threads 18 mating with corresponding female threads in the bore 13 of workpiece or support 29.
  • the smooth inner sleeve 3 surface 19 has a slightly larger diameter than the confronting outer surface 20 of the cylindrical lower extremity 21 of shell 11, thus defining therewith a narrow annular clearance to facilitate correction of any disalighment between the axes of the frustocone and the threads in either the cartridge or the bore 13.
  • FIG. 3 shows the mounting of sleeve 14 on the lower, heavier end of shell 11 by means of two split rings 22, 25 seated in a pair of axially spaced annular grooves 23 of the shell and in internal annular'recesses 24 and 27 of the sleeve/This mode of mounting enables the replacement of the sleeve on the cartridge, eg for insertion of the latter into a different workpiece, or use of the same sleeve to retain a replacement cartridge in the body 29.
  • FIG. 4 shows a modified sleeve mounting with replacement of the lower split ring 25 by a peripheral flange 28 at the bottom end of shell extremity 21.
  • the sleeve 14 can be mounted or detached only by way of the upper end of the shell 11.
  • the conicity of the matingsurfaces of shell 11 and bore 13, i.e. the cotangent of half the vertex angle of the frustocone, is advantageously about 50:1; such tapers can be easily machined with commonly available tools.
  • a heating cartridge comprising:
  • thermally conductive shell having a frustoconical outer surface tapering from a larger end to a smaller end thereof with a conicity on the order of 501.1, said shell being closed at said smaller end and being provided at said larger end with a cylindrically tubular extremity;
  • thermoly conductive dielectric mass in the interior of said shell, said heating coil consisting of resistance wire imbedded in said mass.

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  • Resistance Heating (AREA)
US506888A 1973-09-19 1974-09-17 Electrical heating cartridge Expired - Lifetime US3927301A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2347090A DE2347090C3 (de) 1973-09-19 1973-09-19 Anordnung eines Widerstands-Heizelements in einer Bohrung eines zu beheizenden Werkstücks

Publications (1)

Publication Number Publication Date
US3927301A true US3927301A (en) 1975-12-16

Family

ID=5893037

Family Applications (1)

Application Number Title Priority Date Filing Date
US506888A Expired - Lifetime US3927301A (en) 1973-09-19 1974-09-17 Electrical heating cartridge

Country Status (8)

Country Link
US (1) US3927301A (enrdf_load_stackoverflow)
JP (1) JPS5077944A (enrdf_load_stackoverflow)
AT (1) AT333909B (enrdf_load_stackoverflow)
BE (1) BE820019A (enrdf_load_stackoverflow)
CH (1) CH573697A5 (enrdf_load_stackoverflow)
DE (1) DE2347090C3 (enrdf_load_stackoverflow)
FR (1) FR2244323B1 (enrdf_load_stackoverflow)
SE (1) SE7411413L (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4740674A (en) * 1985-12-16 1988-04-26 Sanri Kabushiki Kaisha Pointed heat-generating device
US5159179A (en) * 1989-03-15 1992-10-27 Chimica Edile Artigiani Di Ghini & Pasquini S.N.C. Heating device for accelerating the action of expansive mortars
US5575941A (en) * 1994-08-31 1996-11-19 Johnson; J. Evan Cartridge heater
US5707006A (en) * 1996-08-27 1998-01-13 Skulic; Vedran Infant incubator heater assembly
US6444952B2 (en) 2000-05-17 2002-09-03 Noma Company Engine block heater with retaining member
US20050184056A1 (en) * 2003-12-23 2005-08-25 J. Evan Johnson Tubular heater and method of manufacture
US20060289474A1 (en) * 2003-12-23 2006-12-28 Johnson J E Tubular heater and method of manufacture
US20070119849A1 (en) * 2005-08-30 2007-05-31 Jeong Min J Heater and vapor deposition source having the same
US20130313246A1 (en) * 2012-05-25 2013-11-28 Watlow Electric Manufacturing Company Variable pitch resistance coil heater
US20140355971A1 (en) * 2013-05-30 2014-12-04 Osram Sylvania Inc. Infrared Heat Lamp Assembly
WO2020229578A1 (en) 2019-05-14 2020-11-19 Ventana Medical Systems, Inc. System including a biological sample treatment chamber
US12151442B1 (en) 2020-06-09 2024-11-26 Ingenarious Consultants LLC Pliable material milling technology

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2847129C2 (de) * 1978-10-30 1986-11-13 Brown, Boveri & Cie Ag, 6800 Mannheim Stabförmiges, elektrisches Bauelement
DE2935430C3 (de) * 1979-09-01 1982-03-11 Türk & Hillinger GmbH & Co, 7200 Tuttlingen Elektrische Heizpatrone zum Einbau in Werkzeugen o.dgl.
JPS5893363U (ja) * 1981-12-21 1983-06-24 三菱自動車工業株式会社 溶融金属取出し装置
DE3406238A1 (de) * 1984-02-21 1985-08-22 Eltra GmbH & Co KG, Leicht & Trambauer, 6102 Pfungstadt Elektrische heizpatrone
JPS61132031U (enrdf_load_stackoverflow) * 1985-02-08 1986-08-18
DE3703689A1 (de) * 1987-02-06 1988-08-18 Magnet Motor Gmbh Elektrische widerstandseinheit zur verwendung in einem schlagwetterschutzbereich
DE3935856C1 (enrdf_load_stackoverflow) * 1989-10-27 1991-04-25 Sfr-Formenbau Dangelmaier Gmbh, 7410 Reutlingen, De
DE202017100786U1 (de) 2017-02-14 2017-03-02 Türk & Hillinger GmbH Heizpatrone

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1416897A (en) * 1920-07-12 1922-05-23 Simon Maurice Electric heater
US2371696A (en) * 1943-07-17 1945-03-20 Cities Service Oil Co Helical electric immersion heater
US2499961A (en) * 1948-04-30 1950-03-07 Gen Electric Electric heating unit
US2623978A (en) * 1951-02-16 1952-12-30 Zell O Cantrell Fuel vaporizing device
US2913987A (en) * 1955-10-10 1959-11-24 Tokheim Corp Swivelling junction box
US3096426A (en) * 1960-04-06 1963-07-02 Axelson Eskil Anders August Electrical paint heater
US3213263A (en) * 1963-11-12 1965-10-19 Kim Hotstart Mfg Company Inc Heater for oil pans of internal combustion engines
US3335459A (en) * 1965-02-12 1967-08-15 Allied Chem Cartridge heater constructions including extrusion dies
US3412231A (en) * 1966-03-29 1968-11-19 Int Paper Co Extrusion die including electrical cartridge heaters
US3461275A (en) * 1968-01-26 1969-08-12 Pyrotel Corp Infrared quartz heater
US3761601A (en) * 1971-10-04 1973-09-25 Killark Electric Manufacturing Removable flame-proof potted fitting

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1416897A (en) * 1920-07-12 1922-05-23 Simon Maurice Electric heater
US2371696A (en) * 1943-07-17 1945-03-20 Cities Service Oil Co Helical electric immersion heater
US2499961A (en) * 1948-04-30 1950-03-07 Gen Electric Electric heating unit
US2623978A (en) * 1951-02-16 1952-12-30 Zell O Cantrell Fuel vaporizing device
US2913987A (en) * 1955-10-10 1959-11-24 Tokheim Corp Swivelling junction box
US3096426A (en) * 1960-04-06 1963-07-02 Axelson Eskil Anders August Electrical paint heater
US3213263A (en) * 1963-11-12 1965-10-19 Kim Hotstart Mfg Company Inc Heater for oil pans of internal combustion engines
US3335459A (en) * 1965-02-12 1967-08-15 Allied Chem Cartridge heater constructions including extrusion dies
US3412231A (en) * 1966-03-29 1968-11-19 Int Paper Co Extrusion die including electrical cartridge heaters
US3461275A (en) * 1968-01-26 1969-08-12 Pyrotel Corp Infrared quartz heater
US3761601A (en) * 1971-10-04 1973-09-25 Killark Electric Manufacturing Removable flame-proof potted fitting

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4740674A (en) * 1985-12-16 1988-04-26 Sanri Kabushiki Kaisha Pointed heat-generating device
US5159179A (en) * 1989-03-15 1992-10-27 Chimica Edile Artigiani Di Ghini & Pasquini S.N.C. Heating device for accelerating the action of expansive mortars
US5575941A (en) * 1994-08-31 1996-11-19 Johnson; J. Evan Cartridge heater
US5707006A (en) * 1996-08-27 1998-01-13 Skulic; Vedran Infant incubator heater assembly
US6444952B2 (en) 2000-05-17 2002-09-03 Noma Company Engine block heater with retaining member
US6472637B2 (en) 2000-05-17 2002-10-29 Noma Company Core plug block heater and method
US20060289474A1 (en) * 2003-12-23 2006-12-28 Johnson J E Tubular heater and method of manufacture
US7064303B2 (en) 2003-12-23 2006-06-20 Thermetic Products, Inc. Tubular heater and method of manufacture
US20050184056A1 (en) * 2003-12-23 2005-08-25 J. Evan Johnson Tubular heater and method of manufacture
US20070119849A1 (en) * 2005-08-30 2007-05-31 Jeong Min J Heater and vapor deposition source having the same
US20130313246A1 (en) * 2012-05-25 2013-11-28 Watlow Electric Manufacturing Company Variable pitch resistance coil heater
US9113501B2 (en) * 2012-05-25 2015-08-18 Watlow Electric Manufacturing Company Variable pitch resistance coil heater
US20140355971A1 (en) * 2013-05-30 2014-12-04 Osram Sylvania Inc. Infrared Heat Lamp Assembly
US10264629B2 (en) * 2013-05-30 2019-04-16 Osram Sylvania Inc. Infrared heat lamp assembly
WO2020229578A1 (en) 2019-05-14 2020-11-19 Ventana Medical Systems, Inc. System including a biological sample treatment chamber
EP4542195A2 (en) 2019-05-14 2025-04-23 Ventana Medical Systems, Inc. Assembly and system including a biological sample treatment chamber
US12151442B1 (en) 2020-06-09 2024-11-26 Ingenarious Consultants LLC Pliable material milling technology

Also Published As

Publication number Publication date
SE7411413L (enrdf_load_stackoverflow) 1975-03-20
FR2244323A1 (enrdf_load_stackoverflow) 1975-04-11
ATA696274A (de) 1976-04-15
AT333909B (de) 1976-12-27
DE2347090A1 (de) 1975-03-20
DE2347090B2 (de) 1978-04-06
BE820019A (fr) 1975-03-17
JPS5077944A (enrdf_load_stackoverflow) 1975-06-25
DE2347090C3 (de) 1979-01-04
CH573697A5 (enrdf_load_stackoverflow) 1976-03-15
FR2244323B1 (enrdf_load_stackoverflow) 1979-02-16

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