US3769494A - Overheating protection arrangement in an electric sauna unit - Google Patents

Overheating protection arrangement in an electric sauna unit Download PDF

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Publication number
US3769494A
US3769494A US00223926A US3769494DA US3769494A US 3769494 A US3769494 A US 3769494A US 00223926 A US00223926 A US 00223926A US 3769494D A US3769494D A US 3769494DA US 3769494 A US3769494 A US 3769494A
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United States
Prior art keywords
opening
air passage
air
sauna
thermostatic switch
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Expired - Lifetime
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US00223926A
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English (en)
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S Janson
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Individual
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Individual
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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H33/00—Bathing devices for special therapeutic or hygienic purposes
    • A61H33/06—Artificial hot-air or cold-air baths; Steam or gas baths or douches, e.g. sauna or Finnish baths
    • A61H33/063—Heaters specifically designed therefor

Definitions

  • the invention relates to an electric sauna unit comprising a casing which forms an air passage open at the bottom and at the top and is adapted to be mounted adjacent a wall of the sauna space, and further comprising electric heating elements located in the air passage.
  • the primary object of this invention is to provide an electric sauna unit of the kind referred to, which eliminates the risk for fires of the related type.
  • an electric sauna unit comprising a casing forming the wall of an air passage open at the bottom and at the top, said casing being adapted to be mounted adjacent a wall in a sauna space, at least one electric heating element located in the air passage, a thermostatic switch for controlling the current supply to the heating element, an opening formed by the wall of the air passage in an upper part thereof, and a sensing element operatively connected with the thermostatic switch and sensing the temperature of air flow passing through the opening when the sauna unit is operated, to actuate the thermostatic switch at a predetermined temperature of such air flow for interrupting the current supply of the heating element.
  • thermostatic switch Due to the heating of the sensing element the thermostatic switch will be operated to break the supply circuit of the heating elements and, thus, the heating of the sauna unit will cease.
  • the thermostatic switch may be adjusted to be actuated at a relatively low temperature since the temperature of the sensing element in the opening is comparatively low during the normal operation of the sauna unit, making it possible to eliminate every risk for overheating of the sauna unit to such an extent that there is impending risk for a fire.
  • FIG. 1 is a vertical cross sectional view of a sauna unit according to the invention when covered by an object
  • PEG. 2 is an elevational view of the rear side of the sauna unit.
  • the sauna unit shown in the drawing is of a construction commonly known having a metal sheet casing 10 which may be double walled and forms an air passage 11 open at the top and the bottom, in which there are located tubular electric heating elements l2, e.g., one for each phase of a three-phase supply. These heating elements are mounted on a connection box and are supported thereby cables being drawn in the conventional manner to a heat control apparatus of a known type. Heating elements 12 may extend into a chamber for heat accumulating bodies, usually stones, located in air passage ill or in another manner. As far as the arrangement of the air passage and a stone chamber, if any, is concerned, the sauna unit may be of one of the well-known constructions appearing on the market such as that disclosed in British Patent Specification No.
  • the sauna unit is adapted to be mounted close to a wall of the sauna space, e.g., on the wall proper by means of brackets or similar means, one wall lid of casing ill facing the sauna wall to form the rear wall of the unit.
  • an opening l5 formed as a horizontally extending narrow slot in the upper half portion of the rear wall the slot being spaced a short distance from the upper end of the sauna unit.
  • a sensing element in which is connected by a conduit 17 with a thermostatic switch 18 located on or in connection box l3.
  • This sensing element in which may be formed as a tubular liquid container is mounted by means of fastening members 16' on a flap 1S deflected from the rear wall into air passage 11 about the lower edge of opening 15 when forming said opening.
  • the liquid container is connected by a capillary tube forming conduit with a bellows or other expansion member forming part of thermostatic switch 1%.
  • sensing element 16 defined by adjustment members provided in thermostatic switch it the liquid in the communicating liquid system formed by sensing element 16, conduit l7 and the expansion member of thermostatic switch 18 will have expanded to a sufficient degree to actuate thermostatic switch 18 over the expansion member.
  • a channel 20 is mounted on the rear wall of the sauna unit to form a protection for conduit 17 which is relatively damageable.
  • thermostatic switch 18 is adjusted to be maintained unacted at the temperature assumed by sensing element 16 during normal operation of the sauna unit.
  • the thermostatic switch may be normally closed and may be connected in series with heating elements 112 in the electric circuit to be opened at a predetermined temperature of sensing element 16 which is higher than that normally assumed by the sensing element such that the current through the heating elementswill be interrupted.
  • thermostatic switch 18 may also beincluded in a separate control circuit for the supply circuit of the heating elements to initiate opening of a circuit breaker when closed at said higher temperature the circuit breaker interrupting the supply circuit of the heating elements.
  • the sauna unit is covered completely or partly by means of an object such as a towel or the like or, as illustrated in the drawing, by a panel 21 the heated air will be deflected by the covering object and will leave air passage 11 not through the upper end thereof but through opening l'as is indicated by arrows 22 in FlG. 1.
  • the hot air flow grazing sensing element 16 raises the temperature thereof considerably and due to the fact that the thermostatic switch is adjusted to react on a relatively low temperature the heating of sensing element 16 will immediately result in an interruption of the current supply to heating elements 12. Any risk for the sauna unit ever to be heated to a temperature which is so high that a covering object or the wall behind will be ignited is thus completely eliminated by this arrangement.
  • the arrangement described provides an overheating protection arrangement for an electric sauna unit which is as simple as effective.
  • the disclosed embodiment may be modified within the scope of the following claims concerning the construction of the thermostatic switch and the location as well as the arrangement of opening 15 and sensing element 16 and also concerning the construction of the sensing element.
  • the overheating protection arrangement will function not only when the'sauna unit is covered but also in case the air circulation through the unit should be obstructed for other reasons for example due to defective ventilation of the sauna space or if the thermostatic means normally responsible for the temperature control in the sauna space should fail and allow un unlimited temperature raise.
  • An electric sauna unit comprising: a casing adapted to be mounted adjacent a wall in a sauna space and defining an air passage having a generally vertical extension and communicating with the ambient atmosphere via the open bottom and top of the casing through which air flows during normal operation, at least one electric heating element located in said air passage, a thermostatic switch for controlling the current supply to the heating element, an opening formed in an upper part of the casing and adapted so that during normal operation of the unit it allows a flow of cool air through said opening from the outside of the casing to the air passage, whereas if the air passage is obstructed the flow of heated air will leave the air passage through said opening, and a sensing element operatively connected to the thermostatic switch being located in the said opening in order to sense the temperature of the air flow passing through said opening and adapted to actuate the thermostatic switch for interrupting the current supply to the heating element when the temperature at the opening reaches a predetermined value.
  • thermostatic switch is located in a lower portion of the air passage.
  • the sensing element being mounted on said flap

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  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Epidemiology (AREA)
  • Pain & Pain Management (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Rehabilitation Therapy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Devices For Medical Bathing And Washing (AREA)
US00223926A 1971-02-08 1972-02-07 Overheating protection arrangement in an electric sauna unit Expired - Lifetime US3769494A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1531/71A SE346064B (is) 1971-02-08 1971-02-08

Publications (1)

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US3769494A true US3769494A (en) 1973-10-30

Family

ID=20258353

Family Applications (1)

Application Number Title Priority Date Filing Date
US00223926A Expired - Lifetime US3769494A (en) 1971-02-08 1972-02-07 Overheating protection arrangement in an electric sauna unit

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US (1) US3769494A (is)
DE (1) DE2205358C3 (is)
SE (1) SE346064B (is)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4045652A (en) * 1974-09-04 1977-08-30 Janson Sven Olof Device for preventing overheating of electric apparatuses
US4227068A (en) * 1976-02-20 1980-10-07 Societe Prl Convector heater
US4260875A (en) * 1978-06-19 1981-04-07 Clairol Incorporated Controlled temperature hair dryer
US4375590A (en) * 1979-06-14 1983-03-01 Tylo Sauna S.A. Corporation Temperature regulator mounting arrangement for electric sauna heating units
US4939344A (en) * 1985-10-03 1990-07-03 Oy Helo-Tehtaat Electric sauna oven with shield for transmitting heat radiation to detector

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2601173A1 (de) * 1976-01-14 1977-07-28 Klafs Saunabau Saunaofen
DE2751833B2 (de) * 1977-11-19 1980-05-29 Braun Ag, 6000 Frankfurt Elektrischer Haartrockner mit Gebläse und Heizung
FI125003B (fi) 2013-10-22 2015-04-30 Risto Tapio Yli-Kovero Kannella varustettu saunan kiuas

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2512892A (en) * 1944-10-11 1950-06-27 Forsberg Gote Ansgar Heating apparatus for hot-air or steam baths
US2988626A (en) * 1958-12-05 1961-06-13 Robbins & Myers Baseboard heater and the like
US3147367A (en) * 1963-12-17 1964-09-01 Bahco Ab Steam bath apparatus
CH416870A (de) * 1963-03-05 1966-07-15 Petz Elektro Waerme Techn Thermolüfter mit einem Heizregister
US3277274A (en) * 1964-01-29 1966-10-04 Raabe Ulo Electric sauna bath heating unit
US3305665A (en) * 1959-11-17 1967-02-21 Laing Vortex Inc Forced circulation electric heater employing cross-flow type fan
US3341675A (en) * 1965-08-26 1967-09-12 Sola Basic Ind Inc Space heater with two thermal sensors acting on a controller actuator along approximately the same line
US3348021A (en) * 1965-02-15 1967-10-17 Gen Electric Electric heater assembly for a sauna room
US3400248A (en) * 1965-12-08 1968-09-03 Isomaa Erik Electric steam bath stove
US3452369A (en) * 1967-06-14 1969-07-01 Viking Sauna Co Compact sauna unit

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB766533A (en) * 1952-04-04 1957-01-23 Gillott Electro Appliances Ltd Improvements in or relating to electric convection heaters
DE1748693U (de) * 1957-04-20 1957-07-18 Ludwig Martin Fa Elektrisches heizgeraet mit mehreren heizstufen.
DE1224446B (de) * 1961-07-15 1966-09-08 Robert Thoener Zusammenklappbare Heimsauna
DE1868414U (de) * 1963-01-09 1963-03-07 Alaska Werk Dieter Schildbach Heimsauna.
DE1959204A1 (de) * 1969-11-26 1971-06-09 Damen Karl Dipl Ing Elastisches Arbeitsfugenband mit Versteifungseinlagen in Laengsrichtung

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2512892A (en) * 1944-10-11 1950-06-27 Forsberg Gote Ansgar Heating apparatus for hot-air or steam baths
US2988626A (en) * 1958-12-05 1961-06-13 Robbins & Myers Baseboard heater and the like
US3305665A (en) * 1959-11-17 1967-02-21 Laing Vortex Inc Forced circulation electric heater employing cross-flow type fan
CH416870A (de) * 1963-03-05 1966-07-15 Petz Elektro Waerme Techn Thermolüfter mit einem Heizregister
US3147367A (en) * 1963-12-17 1964-09-01 Bahco Ab Steam bath apparatus
US3277274A (en) * 1964-01-29 1966-10-04 Raabe Ulo Electric sauna bath heating unit
US3348021A (en) * 1965-02-15 1967-10-17 Gen Electric Electric heater assembly for a sauna room
US3341675A (en) * 1965-08-26 1967-09-12 Sola Basic Ind Inc Space heater with two thermal sensors acting on a controller actuator along approximately the same line
US3400248A (en) * 1965-12-08 1968-09-03 Isomaa Erik Electric steam bath stove
US3452369A (en) * 1967-06-14 1969-07-01 Viking Sauna Co Compact sauna unit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4045652A (en) * 1974-09-04 1977-08-30 Janson Sven Olof Device for preventing overheating of electric apparatuses
US4227068A (en) * 1976-02-20 1980-10-07 Societe Prl Convector heater
US4260875A (en) * 1978-06-19 1981-04-07 Clairol Incorporated Controlled temperature hair dryer
US4375590A (en) * 1979-06-14 1983-03-01 Tylo Sauna S.A. Corporation Temperature regulator mounting arrangement for electric sauna heating units
US4939344A (en) * 1985-10-03 1990-07-03 Oy Helo-Tehtaat Electric sauna oven with shield for transmitting heat radiation to detector

Also Published As

Publication number Publication date
DE2205358A1 (de) 1972-08-24
DE2205358B2 (de) 1977-11-24
DE2205358C3 (de) 1984-08-02
SE346064B (is) 1972-06-26

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