US1980528A - Electric heating pad - Google Patents

Electric heating pad Download PDF

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Publication number
US1980528A
US1980528A US600492A US60049232A US1980528A US 1980528 A US1980528 A US 1980528A US 600492 A US600492 A US 600492A US 60049232 A US60049232 A US 60049232A US 1980528 A US1980528 A US 1980528A
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US
United States
Prior art keywords
heating pad
rubber
electric heating
resistance wire
mass
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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
US600492A
Inventor
Hubl Josef
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FIRM "PELITHE" HOLDING AG
Firm Pelithe Holding A G
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Firm Pelithe Holding A G
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Publication date
Application filed by Firm Pelithe Holding A G filed Critical Firm Pelithe Holding A G
Application granted granted Critical
Publication of US1980528A publication Critical patent/US1980528A/en
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Expired - Lifetime legal-status Critical Current

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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
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/34—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs
    • H05B3/342—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs heaters used in textiles
    • 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/002—Heaters using a particular layout for the resistive material or resistive elements
    • H05B2203/004—Heaters using a particular layout for the resistive material or resistive elements using zigzag layout
    • 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/014—Heaters using resistive wires or cables not provided for in H05B3/54
    • 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/017—Manufacturing methods or apparatus for heaters

Definitions

  • the electric heating pads for thennic treatment of parts of the human body as heretoiore used are not sufliciently safe against short circuiting by the body or against grounding by penetrating moisture which would prove dangerous to the patient. Nor do these electric heating pads satisfy the requirements as regards mechanical strength to the desirable extent and finally they are open to the objection that they 4 cannot be made to fit exactly any' shape of the part of the body to be heated. The attempts heretofore made to remove these drawbacks did not lead to satisfactory results.
  • Fig. 1 is an elevation partly in section and Fig. 2 a transverse section ot an electric heating pad.
  • the resistance wire a preierably a wire wound around an asbestos coreis used which wire is also provided with a covering plaited thereon, say of asbestos.
  • a suitable number of zig zags of this wire is embedded in the rubber mass b and connected to the supply cable c also covered with a rubber layer. It is essential that the rubber layer covering the cable c is integral with the rubber mass b.
  • the resistance wire In order to bring the rubber mass as quickly as possible to the desired temperature, it is necessary to heat the resistance wire to a temperature exceeding to a certain extent the desired and permissible temperature of the heating pad. 40 But this higher heating oi' the resistance wire would result in a deleterlous eflect on the rubber mass surrounding the same by reducing the pliancy and elasticity oi' this mass. For this reason the resistance wire is provided. as stated above, with a heat insulating covering, such !or instance as asbestos, which prevents the overheating of the rubber mass.
  • the resistance wire is embedded in the rubber mass while the latter is in a plastic condition.
  • a vulcanizing process extending over the entire rubber mass enclosingthe resistance wire and the supply wires a resistlng and pliant structure of the desired shape is obtained in which the penetration oi' moisture to 5 the electrically conducting parts is prevented.
  • a particular advantage of the heating pad according to the invention consists besides in that it may be readily disiniected, since owing to the fact that the. pad is completely closed and has a smooth surface, it may be placed in a disin- !ecting liquid of a comparatively high temperature or even boiled without any detriment.
  • any other mass having similar properties as to pliancy, elasticity and resistance to heat as rubber may be used.
  • the resistance wire may also be embedded into the rubber mass or similar mass by pouring or pressing the mass round the wire.
  • An electric heating pad comprising a flexible resistance wire provided with an asbestos covering plaited thereon and wound around an asbestos core, and supply wires electrically connected with the said resistance wire and a carrier tor the said resistance wire consisting of rubber the said resistance wire being completely vulcanized into the said carrier and the said supply wires being completely embedded in a sheath o! rubber integral. with the said carrier and extending from the said carrier to a plug contact over a considerable length whereby any contact o! the body to which the pad is applied with the said plug contact is avoided.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Resistance Heating (AREA)

Description

Patented Nov. 13, 1934 UNITED STATES PATENT OFFICE ELECTRIC HEATING PAD Application March 22, 1932, Serial No. 0,492
' In Austria March 28, 1931 1 Ciaim.
The electric heating pads for thennic treatment of parts of the human body as heretoiore used are not sufliciently safe against short circuiting by the body or against grounding by penetrating moisture which would prove dangerous to the patient. Nor do these electric heating pads satisfy the requirements as regards mechanical strength to the desirable extent and finally they are open to the objection that they 4 cannot be made to fit exactly any' shape of the part of the body to be heated. The attempts heretofore made to remove these drawbacks did not lead to satisfactory results.
In the electric heating pad Iorming the subject matter of the invention the said drawbacks are fully done away with by tightly enclosing on all sides the resistance wire provided with a heat insulating covering as well as its supply wires in a pliant rubber or rubber like mass The annexed drawing illustrates by way of example an embodiment of the present invention,
Fig. 1 is an elevation partly in section and Fig. 2 a transverse section ot an electric heating pad.
'As the resistance wire a preierably a wire wound around an asbestos coreis used which wire is also provided with a covering plaited thereon, say of asbestos. A suitable number of zig zags of this wire is embedded in the rubber mass b and connected to the supply cable c also covered with a rubber layer. It is essential that the rubber layer covering the cable c is integral with the rubber mass b.
In order to bring the rubber mass as quickly as possible to the desired temperature, it is necessary to heat the resistance wire to a temperature exceeding to a certain extent the desired and permissible temperature of the heating pad. 40 But this higher heating oi' the resistance wire would result in a deleterlous eflect on the rubber mass surrounding the same by reducing the pliancy and elasticity oi' this mass. For this reason the resistance wire is provided. as stated above, with a heat insulating covering, such !or instance as asbestos, which prevents the overheating of the rubber mass.
Preierably the resistance wire is embedded in the rubber mass while the latter is in a plastic condition. By a vulcanizing process extending over the entire rubber mass enclosingthe resistance wire and the supply wires a resistlng and pliant structure of the desired shape is obtained in which the penetration oi' moisture to 5 the electrically conducting parts is prevented.
(Ci. 219-463) l The intimate enclosing of the individual lengths of the resistance wire by the elastic rubber mass prevents any injury to the resistance wire when the shape ot the heating pad is changed. On the contrary the individual lengths of the resistance wire will follow the elastic deiormations of the rubber body without breaking. The high pliancy and elasticity of the heating pad enable it to adapt itself to the shape of any part oi' the human body, shoulder, knee and so on.
A particular advantage of the heating pad according to the invention consists besides in that it may be readily disiniected, since owing to the fact that the. pad is completely closed and has a smooth surface, it may be placed in a disin- !ecting liquid of a comparatively high temperature or even boiled without any detriment.
Instead of a rubber mass any other mass having similar properties as to pliancy, elasticity and resistance to heat as rubber may be used. The resistance wire may also be embedded into the rubber mass or similar mass by pouring or pressing the mass round the wire.
Finally I wish it to be understood that when automatic switches are used these too have to be vulcanized. cast or pressed into the rubber mass or similar mass.
What I claim is:
An electric heating pad comprising a flexible resistance wire provided with an asbestos covering plaited thereon and wound around an asbestos core, and supply wires electrically connected with the said resistance wire and a carrier tor the said resistance wire consisting of rubber the said resistance wire being completely vulcanized into the said carrier and the said supply wires being completely embedded in a sheath o! rubber integral. with the said carrier and extending from the said carrier to a plug contact over a considerable length whereby any contact o! the body to which the pad is applied with the said plug contact is avoided. r
JOSEF H'BL.
US600492A 1931-03-28 1932-03-22 Electric heating pad Expired - Lifetime US1980528A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT1980528X 1931-03-28

Publications (1)

Publication Number Publication Date
US1980528A true US1980528A (en) 1934-11-13

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Family Applications (1)

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US600492A Expired - Lifetime US1980528A (en) 1931-03-28 1932-03-22 Electric heating pad

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4197449A (en) * 1978-07-05 1980-04-08 Springfield Wire Inc. Flexible electrical heater
US6294768B1 (en) * 1998-08-20 2001-09-25 Advanced Recycling Sciences, Inc. Flexible electrically heated tiles made from crumb rubber
US20110074380A1 (en) * 2008-05-28 2011-03-31 Silveray Co., Ltd. Electric conduction pad and manufacturing method thereof
US20150341987A1 (en) * 2012-07-24 2015-11-26 Al Bernstein Radiator element
USD954978S1 (en) * 2020-05-29 2022-06-14 Sh Technology Co., Ltd. Heating pad

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4197449A (en) * 1978-07-05 1980-04-08 Springfield Wire Inc. Flexible electrical heater
US6294768B1 (en) * 1998-08-20 2001-09-25 Advanced Recycling Sciences, Inc. Flexible electrically heated tiles made from crumb rubber
US20110074380A1 (en) * 2008-05-28 2011-03-31 Silveray Co., Ltd. Electric conduction pad and manufacturing method thereof
US20150341987A1 (en) * 2012-07-24 2015-11-26 Al Bernstein Radiator element
US9936538B2 (en) * 2012-07-24 2018-04-03 Al Bernstein Radiator element
USD954978S1 (en) * 2020-05-29 2022-06-14 Sh Technology Co., Ltd. Heating pad

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