EP1102008B1 - Heat recovery device - Google Patents

Heat recovery device Download PDF

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Publication number
EP1102008B1
EP1102008B1 EP99490037A EP99490037A EP1102008B1 EP 1102008 B1 EP1102008 B1 EP 1102008B1 EP 99490037 A EP99490037 A EP 99490037A EP 99490037 A EP99490037 A EP 99490037A EP 1102008 B1 EP1102008 B1 EP 1102008B1
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EP
European Patent Office
Prior art keywords
recovery device
tubes
air
called
ash container
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
EP99490037A
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German (de)
French (fr)
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EP1102008A1 (en
Inventor
Marc Descamps
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Tifon SA
Original Assignee
Tifon SA
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Filing date
Publication date
Application filed by Tifon SA filed Critical Tifon SA
Priority to DE69917644T priority Critical patent/DE69917644T2/en
Priority to EP99490037A priority patent/EP1102008B1/en
Priority to AT99490037T priority patent/ATE267984T1/en
Publication of EP1102008A1 publication Critical patent/EP1102008A1/en
Application granted granted Critical
Publication of EP1102008B1 publication Critical patent/EP1102008B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24B—DOMESTIC STOVES OR RANGES FOR SOLID FUELS; IMPLEMENTS FOR USE IN CONNECTION WITH STOVES OR RANGES
    • F24B1/00—Stoves or ranges
    • F24B1/18—Stoves with open fires, e.g. fireplaces
    • F24B1/185—Stoves with open fires, e.g. fireplaces with air-handling means, heat exchange means, or additional provisions for convection heating ; Controlling combustion
    • F24B1/188—Stoves with open fires, e.g. fireplaces with air-handling means, heat exchange means, or additional provisions for convection heating ; Controlling combustion characterised by use of heat exchange means , e.g. using a particular heat exchange medium, e.g. oil, gas  
    • F24B1/1885—Stoves with open fires, e.g. fireplaces with air-handling means, heat exchange means, or additional provisions for convection heating ; Controlling combustion characterised by use of heat exchange means , e.g. using a particular heat exchange medium, e.g. oil, gas   the heat exchange medium being air only
    • F24B1/1888—Stoves with open fires, e.g. fireplaces with air-handling means, heat exchange means, or additional provisions for convection heating ; Controlling combustion characterised by use of heat exchange means , e.g. using a particular heat exchange medium, e.g. oil, gas   the heat exchange medium being air only with forced circulation

Definitions

  • the invention relates to an air circulation heat recovery unit arranged in the hearth of an open fireplace.
  • recuperators of heat of air posed on the face horizontal bottom of the fireplace To increase the heating efficiency of open fireplaces, it is known to use recuperators of heat of air posed on the face horizontal bottom of the fireplace.
  • the exchange surface must be large and, therefore, the greater the external surface of the tubes, in contact with the embers and / or logs increases, the more efficient the recuperator.
  • the underside of the tubes is then very close to the support plane.
  • the ash produced must be removed from time to time.
  • a lever device which allows momentarily lift one side of the recuperator.
  • the subject of the invention is a recuperator of the aforementioned type which provides in particular a solution to the problem mentioned above.
  • the means 6 for circulating air comprises at least one turbine which, generally, draws air from the room in which the recuperator is located and, after passage through the tubes, the pulse in the same room or in at least one another room, via one or more pipes, called evacuation.
  • This recuperator is characterized in that it further comprises, between the tubes 4, a perforated basket 7 whose bottom 7A of this basket is located substantially in the lower plane of the tubes 4, which basket retains the embers.
  • this recuperator comprises an ash pan 8 placed under the recuperator which, for this purpose, has means, such as feet 9 now the tubes at a predetermined height.
  • baskets 7 are formed of independent branches one another, which is a possible embodiment, advantageously, They are integral with each other and, preferably, are removable.
  • the basket 7 only includes a shaped bottom 7A rectangular preserving at least one passage 10 or free space for, from on the one hand, the air and, on the other hand, a controlled fall of the ashes.
  • this passage 10 is important because it is too large; this passage does not retain the ash.
  • These baskets are devoid of at least some of their side walls, in particular, those parallel to the longitudinal axes of the tubes.
  • the tubes are of square or rectangular section.
  • baskets will be provided with a handle for handling.
  • the recuperator has side cheeks 12 which extend substantially to the support plane of said recuperator.
  • the cold air inlet 14, the heated air outlet and the turbine are housed in a rectangular box 13, one face 15 of which partially constitutes the face said front of the recuperator, i.e. the side facing the center of the room and the other part of the front face of the recuperator being materialized by one called front 16 of the side faces of the ash pan.
  • the ash pan has a wall 30 known as a separation separating the ash pan in two parts 20, 21, one rear 20 intended to contain ashes and the other known as 21 front serving as a duct for the air intended to be introduced into the tubes, this partition wall preventing the ashes from falling into the front part and are drawn into the tubes.
  • the ash pan can be housed in a cavity in the tank of the chimney, cavity open of course upwards and the front part of the fireplace.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Sorption Type Refrigeration Machines (AREA)
  • Air Supply (AREA)

Abstract

The heater heat recuperator has a grill (3) with large section tubes (4) positioned in parallel and connected to a recuperation circuit. The heated air is fed through the grill in contact with the tubes. The tube7s are connected to a perforated ash pan (7), the level of which is the same as the lower ends of the tubes.

Description

L'invention se rapporte à un récupérateur de chaleur à circulation d'air disposé dans l'âtre d'une cheminée à foyer ouvert.The invention relates to an air circulation heat recovery unit arranged in the hearth of an open fireplace.

Les cheminées à foyer fermé récupèrent beaucoup plus de chaleur que celles à foyer ouvert mais n'ont pas le charme de ces dernières.Closed fireplaces recover much more heat than those with open hearths but do not have the charm of the latter.

Pour augmenter l'efficacité de chauffe des cheminées à foyer ouvert, il est connu d'utiliser des récupérateurs de chaleur à circulation d'air posé sur la face inférieure horizontale du foyer.To increase the heating efficiency of open fireplaces, it is known to use recuperators of heat of air posed on the face horizontal bottom of the fireplace.

Un tel récupérateur de chaleur comprend :

  • une grille de foyer, constituée de tubes de forte section disposés parallèlement entre eux et reliés à au moins une conduite dite de transfert pour former un circuit, au travers duquel circuit de l'air est propulsé pour se réchauffer au contact des parois internes des tubes et
  • un moyen pour prélever de l'air puis le forcer à circuler dans la grille avant de le réintroduire dans le local à chauffer.
Such a heat recovery unit comprises:
  • a hearth grid, consisting of large section tubes arranged parallel to each other and connected to at least one so-called transfer pipe to form a circuit, through which the air circuit is propelled to heat up in contact with the internal walls of the tubes and
  • a means for taking air and then forcing it to circulate in the grate before reintroducing it into the room to be heated.

Pour obtenir un bon rendement, il faut que la surface d'échange soit importante et, donc, plus la surface extérieure des tubes, en contact avec les braises et/ou les bûches, augmente, plus le récupérateur est efficace.To obtain a good yield, the exchange surface must be large and, therefore, the greater the external surface of the tubes, in contact with the embers and / or logs increases, the more efficient the recuperator.

C'est ainsi que l'on préfère utiliser généralement des gros tubes de section carrée avec des intervalles entre les tubes importants de manière que les braises puissent s'accumuler dans l'espace délimité par les faces latérales des tubes et le plan d'appui sur lequel repose la grille.This is how we generally prefer to use large section tubes square with intervals between the large tubes so that the embers can accumulate in the space delimited by the lateral faces of the tubes and the support plane on which the grid rests.

Pour retenir les braises au niveau des tubes, la face inférieure des tubes est alors très proche du plan d'appui.To retain the embers at the level of the tubes, the underside of the tubes is then very close to the support plane.

Il est connu (US-A-4.122.825) un récupérateur mettant en oeuvre des tubes ronds et sous lesquels se situe une simple grille fixée à demeure sous les tubes.It is known (US-A-4,122,825) a recuperator implementing round tubes and under which is a simple grid permanently fixed under the tubes.

On obtient ainsi que la chaleur de ces braises chauffe latéralement les tubes.We thus obtain that the heat of these embers laterally heats the tubes.

Les cendres produites doivent être évacuées de temps en temps.The ash produced must be removed from time to time.

Se pose alors une difficulté car la grille très prôche du plan d'appui du récupérateur gêne l'élimination des cendres et les récupérateurs étant relativement lourds, entre quarante et soixante kilogrammes, il n'est pas aisé de les sortir du foyer pour procéder au nettoyage.A difficulty then arises because the grid very close to the support plane of the recuperator hinders the disposal of ash and the recuperators being relatively heavy, between forty and sixty kilograms, it is not easy to remove them from the fireplace for cleaning.

Pour faciliter le nettoyage, il est prévu un dispositif à levier qui permet de soulever momentanément un côté du récupérateur.To facilitate cleaning, a lever device is provided which allows momentarily lift one side of the recuperator.

On connaít également du brevet US-4.078.542, un récupérateur mettant en oeuvre des tubes ronds sous lesquels se tient une simple grille pouvant coulisser dans une fente prévue au niveau du support du récupérateur.We also know from US-4,078,542, a recuperator putting works with round tubes under which stands a simple grid that can slide in a slot provided at the recuperator support.

Cela étant, il n'est pas possible de retirer la grille avec les cendres pour le nettoyage, les cendres étant nécessairement bloquées par les tubes ou par le support du récupérateur.However, it is not possible to remove the grate with the ashes for the cleaning, the ashes necessarily being blocked by the tubes or by the recovery support.

Cela rend l'accès plus facile mais, en tout hypothèse, n'a pas la fonctionnalité et l'aisance d'un bac à cendres.This makes access easier but, in any event, does not have the functionality and ease of an ash pan.

L'invention a pour objet un récupérateur du type précité qui apporte notamment une solution au problème évoqué ci-avant.The subject of the invention is a recuperator of the aforementioned type which provides in particular a solution to the problem mentioned above.

A cet effet, l'invention a pour objet un récupérateur de chaleur comprenant :

  • une grille de foyer constituée de tubes de forte section disposés parallèlement entre eux et reliés à au moins une conduite, dite de transfert, pour former un circuit, au travers duquel circuit, de l'air circule pour se réchauffer au contact des parois des tubes et
  • un moyen pour prélever de l'air puis le forcer à circuler dans les tubes avant de le réintroduire dans le local à chauffer,
   ce récupérateur étant caractérisé en ce que :
  • d'une part, les tubes ont une section carrée ou rectangulaire et,
  • d'autre part, la paroi retenant les braises est constituée par le fond d'au moins un panier.
To this end, the subject of the invention is a heat recovery unit comprising:
  • a hearth grid made up of large section tubes arranged parallel to each other and connected to at least one pipe, known as a transfer pipe, to form a circuit, through which circuit, air circulates to heat up in contact with the walls of the tubes and
  • a means for taking air and then forcing it to circulate in the tubes before reintroducing it into the room to be heated,
this recuperator being characterized in that:
  • on the one hand, the tubes have a square or rectangular section and,
  • on the other hand, the wall retaining the embers is formed by the bottom of at least one basket.

L'invention sera bien comprise à l'aide de la description ci-après faite à titre d'exemple non limitatif en regard du dessin qui représente schématiquement :

  • figure 1 : une coupe verticale du récupérateur,
  • figure 2 : une coupe selon II-II de la figure 1.
The invention will be clearly understood with the aid of the description below given by way of nonlimiting example with regard to the drawing which schematically represents:
  • Figure 1: a vertical section of the recuperator,
  • Figure 2: a section along II-II of Figure 1.

En se reportant au dessin, on voit un récupérateur 1 de chaleur placé dans une cheminée à foyer ouvert.Referring to the drawing, we see a heat recovery unit 1 placed in an open fireplace.

Ce récupérateur repose sur la face 2 inférieure de la cheminée dite face d'appui et comprend :

  • une grille 3 de foyer constituée de tubes 4 de forte section disposés parallèlement entre eux et reliés à au moins une conduite 5 dite de transfert pour former un circuit, au travers duquel circuit, de l'air circule pour se réchauffer au contact des parois des tubes et
  • un moyen 6 pour prélever de l'air puis pour le forcer à circuler dan les tubes avant de le réintroduire dans le local à chauffer.
This recuperator rests on the lower face 2 of the chimney called the bearing face and comprises:
  • a hearth grid 3 consisting of tubes 4 of large section arranged parallel to each other and connected to at least one so-called transfer pipe 5 to form a circuit, through which circuit, air circulates to heat up in contact with the walls of the tubes and
  • means 6 for taking air and then forcing it to circulate in the tubes before reintroducing it into the room to be heated.

Le moyen 6 pour faire circuler de l'air comprend au moins une turbine qui, généralement, aspire l'air du local dans lequel se trouve le récupérateur et, après passage au travers des tubes, le pulse dans le même local ou dans au moins une autre pièce, via une ou plusieurs conduites, dites d'évacuation.The means 6 for circulating air comprises at least one turbine which, generally, draws air from the room in which the recuperator is located and, after passage through the tubes, the pulse in the same room or in at least one another room, via one or more pipes, called evacuation.

Ce récupérateur se caractérise en ce qu'il comprend en outre, entre les tubes 4, un panier 7 perforé dont le fond 7A de ce panier est situé sensiblement dans le plan inférieur des tubes 4, lequel panier retient les braises. This recuperator is characterized in that it further comprises, between the tubes 4, a perforated basket 7 whose bottom 7A of this basket is located substantially in the lower plane of the tubes 4, which basket retains the embers.

Par ailleurs, ce récupérateur comprend un bac 8 à cendres disposé sous le récupérateur qui, à cet effet, présente des moyens, tels des pieds 9 maintenant les tubes à une hauteur prédéterminée.Furthermore, this recuperator comprises an ash pan 8 placed under the recuperator which, for this purpose, has means, such as feet 9 now the tubes at a predetermined height.

Au lieu que les paniers 7 soient formés de branches indépendantes les unes des autres, qui est une forme de réalisation possible, avantageusement, Ils sont solidaires les uns des autres et, de préférence, sont amovibles.Instead of the baskets 7 being formed of independent branches one another, which is a possible embodiment, advantageously, They are integral with each other and, preferably, are removable.

Le panier 7 comprend uniquement un fond 7A de forme rectangulaire préservant au moins un passage 10 ou interstice libre pour, d'une part, l'air et, d'autre part, une chute contrôlée des cendres.The basket 7 only includes a shaped bottom 7A rectangular preserving at least one passage 10 or free space for, from on the one hand, the air and, on the other hand, a controlled fall of the ashes.

La dimension de ce passage 10 est importante car trop grande ; ce passage ne permet pas de retenir la cendre.The dimension of this passage 10 is important because it is too large; this passage does not retain the ash.

Il est donc intéressant que le plan dans lequel s'étendent les fonds des paniers soit sensiblement le même que celui dans lequel s'étendent les faces inférieures des tubes carrés.It is therefore interesting that the plane in which the funds of the baskets is substantially the same as that in which the faces extend lower square tubes.

Ces paniers sont dépourvus d'au moins certaines de leurs parois latérales, notamment, de celles parallèles aux axes longitudinaux des tubes.These baskets are devoid of at least some of their side walls, in particular, those parallel to the longitudinal axes of the tubes.

La présence de ces paniers réduit considérablement la chute des braises 11 dans le bac à cendres et ces dernières sont alors maintenues en contact avec les parois latérales des tubes le temps nécessaire pour qu'elles soient complêtement consumées et se désagrègent en morceaux suffisamment réduits pour passer par les perforations du panier et tomber dans le bac à cendres.The presence of these baskets considerably reduces the fall of embers 11 in the ash pan and the latter are then kept in contact with the side walls of the tubes the time necessary for them to be completely consumed and fall into pieces small enough to pass through basket perforations and fall into the ash pan.

Les tubes sont de section carrée ou rectangulaire.The tubes are of square or rectangular section.

Après extinction du feu, il est facile de faire tomber les cendres dans le bac à cendres pour ensuite les éliminer.After extinguishing the fire, it is easy to drop the ashes into the bin to ash and then dispose of them.

Ces paniers seront pourvus d'un manche pour la manipulation.These baskets will be provided with a handle for handling.

On peut ainsi les engager ou les extraire depuis le dessus du récupérateur.We can thus engage or extract them from above the recuperator.

Pour confiner la chaleur, le récupérateur présente latéralement des joues 12 qui s'étendent sensiblement jusqu'au plan d'appui dudit récupérateur.To contain the heat, the recuperator has side cheeks 12 which extend substantially to the support plane of said recuperator.

L'entrée 14 d'air froid, la sortie d'air réchauffé et la turbine sont logées dans un caisson 13 parallélipipédique dont une face 15 constitue partiellement la face dite avant du récupérateur, c'est à dire la face tournée vers le centre du local et l'autre partie de la face avant du récupérateur étant matérialisée par l'une dite frontale 16 des faces latérales du bac à cendres.The cold air inlet 14, the heated air outlet and the turbine are housed in a rectangular box 13, one face 15 of which partially constitutes the face said front of the recuperator, i.e. the side facing the center of the room and the other part of the front face of the recuperator being materialized by one called front 16 of the side faces of the ash pan.

Entre le caisson 13 précité et la face 16 dite frontale du bac à cendres, est préservé un interstice 17 suffisamment grand pour que :

  • l'air prélevé, pour être réchauffé, soit aspiré par la turbine dont l'entrée 14 se situe dans la paroi 18 inférieure du caisson et
  • l'un des éléments, que sont le caisson et le bac à cendres, porte un déflecteur 19 canalisant l'air provenant de l'interstice 17 vers l'entrée 14 de la turbine.
Between the aforementioned box 13 and the so-called front face 16 of the ash pan, a gap 17 is preserved which is large enough for:
  • the air taken off, to be heated, is sucked in by the turbine, the inlet 14 of which is located in the bottom wall 18 of the box and
  • one of the elements, which are the box and the ash pan, carries a deflector 19 channeling the air coming from the gap 17 towards the inlet 14 of the turbine.

C'est, de préférence, le caisson 13 qui porte ce déflecteur 19.It is preferably the box 13 which carries this deflector 19.

Sensiblement, au droit du bord inférieur du déflecteur 19, le bac à cendres présente une paroi 30 dite de séparation séparant le bac à cendres en deux parties 20, 21, l'une 20 arrière destinée à contenir des cendres et l'autre 21 dite avant servant de canalisation pour l'air destiné à être introduit dans les tubes, cette paroi de séparation évitant que les cendres tombent dans la partie avant et soient aspirées dans les tubes.Significantly, to the right of the lower edge of the deflector 19, the ash pan has a wall 30 known as a separation separating the ash pan in two parts 20, 21, one rear 20 intended to contain ashes and the other known as 21 front serving as a duct for the air intended to be introduced into the tubes, this partition wall preventing the ashes from falling into the front part and are drawn into the tubes.

Avantageusement, dans la partie 20 arrière du bac à cendres, depuis sensiblement le bord 22 supérieur de la paroi de séparation et jusqu'à la paroi inférieure du bac à cendres, se loge un plan 23 incliné tendant à ramener les cendres vers l'arrière de manière à les concentrer sous la grille.Advantageously, in the rear part of the ash pan, from substantially the upper edge 22 of the partition wall and up to the wall bottom of the ash pan, accommodates an inclined plane 23 tending to bring the ashes backwards so as to concentrate them under the grate.

Le bac à cendres pourra être logé dans une cavité de la sôle de la cheminée, cavité ouverte bien entendu vers le haut et la partie frontale de la cheminée.The ash pan can be housed in a cavity in the tank of the chimney, cavity open of course upwards and the front part of the fireplace.

Claims (10)

  1. Air circulation heat Recovery device arranged in the hearth of an open fireplace comprising:
    a hearth grate (3) made up of strong section tubes (4) arranged parallel to each other and connected to at least one duct (5), called the transfer duct, to form a circuit and air circulates through this circuit to heat up in contact with the walls of the tubes (4),
    a means (6) for taking the air and then forcing it to circulate in the tubes (4) before sending it back into the premises to be heated, and
    located more or less in the lower plane of the tubes (4), a wall retaining the embers, this Recovery device being characterised in that:
    on the one hand, the tubes (4) are square or rectangular in section and,
    on the other hand, the wall retaining the embers consists of the bottom (7A) of at least one basket (7) which can be extracted from the top of the Recovery device.
  2. Recovery device according to Claim 1, characterised in that the baskets (7) are integral with one another.
  3. Recovery device according to Claim 1, characterised in that the baskets (7) are removable.
  4. Recovery device according to Claim 1, characterised in that the basket (7) comprises only a rectangular shaped bottom (7A) which preserves at least one passage (10) or free gap, on the one hand for air and, on the other hand, for controlled dropping of the ashes.
  5. Recovery device according to Claim 1, characterised in that it has cheeks (12) at the side which extend more or less to a plane supporting the said Recovery device.
  6. Recovery device according to Claim 1, characterised in that it includes an ash container (8) arranged under the Recovery device which, for this purpose, has means of keeping the tubes (4) at a predetermined height.
  7. Recovery device according to Claim 6, in which the cold air inlet (14), the heated air outlet and the turbine are housed in a parallelopipedic box (13), one face (15) of which is partly what is called the front face of the Recovery device and the other part of the front face of the Recovery device taking the form of what is called a frontage (16) of the side faces of the ash container, characterised in that, between the box (13) and what is called the frontage face (16) of the ash container, a gap (17) is kept which is large enough so that:
    the air taken for reheating is sucked by the turbine, the inlet (14) of which is located in the lower wall (18) of the box, and
    one of the items, these being the box and the ash container, has a deflector (19) channelling the air originating from the gap (17) towards the turbine inlet (14).
  8. Recovery device according to Claim 7, characterised in that it is the box (13) which carries this deflector (19).
  9. Recovery device according to Claim 7 or 8, characterised in that, opposite to the deflector (19), the ash container has what is called a separating wall (30) which divides the ash container into two parts (20, 21), the rear one (20) designed to contain ashes and the other one (21), called the front one, being used for channelling the air intended to be introduced into the tubes, this separating wall preventing ash from falling into the front part and being sucked into the tubes.
  10. Recovery device according to Claim 9, characterised in that, in the rear part (20) of the ash container, more or less from the top edge (22) of the separating wall and up to the bottom wall of the ash container, there is an inclined plane which tends to bring the ashes towards the rear so as to concentrate them under the grate.
EP99490037A 1999-11-17 1999-11-17 Heat recovery device Expired - Lifetime EP1102008B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE69917644T DE69917644T2 (en) 1999-11-17 1999-11-17 heat recuperator
EP99490037A EP1102008B1 (en) 1999-11-17 1999-11-17 Heat recovery device
AT99490037T ATE267984T1 (en) 1999-11-17 1999-11-17 HEAT RECUPERATOR

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP99490037A EP1102008B1 (en) 1999-11-17 1999-11-17 Heat recovery device

Publications (2)

Publication Number Publication Date
EP1102008A1 EP1102008A1 (en) 2001-05-23
EP1102008B1 true EP1102008B1 (en) 2004-05-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP99490037A Expired - Lifetime EP1102008B1 (en) 1999-11-17 1999-11-17 Heat recovery device

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EP (1) EP1102008B1 (en)
AT (1) ATE267984T1 (en)
DE (1) DE69917644T2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3008781B1 (en) * 2013-07-19 2015-10-02 Tifon DEVICE TO BE PROVIDED IN THE ATRE OF A FIREPLACE OPEN TO PROCESS THIS FIREPLACE INTO A FIREPLACE FENCED OR PARTIALLY OPENED

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3635211A (en) * 1970-04-07 1972-01-18 Henry O Englert Heat exchanger for fireplaces
US4078542A (en) * 1976-08-11 1978-03-14 Morton Metalcraft Co. Fireplace grate and blower
US4122825A (en) 1977-03-10 1978-10-31 Slate Robert C Air-heater type fireplace grate
AU3611178A (en) * 1978-05-15 1979-11-22 Clarke B T Fireplace heat saver
US4515147A (en) * 1984-01-23 1985-05-07 Grouw Samuel J Van Clean burning grate for fireplaces and wood stoves

Also Published As

Publication number Publication date
DE69917644D1 (en) 2004-07-01
EP1102008A1 (en) 2001-05-23
ATE267984T1 (en) 2004-06-15
DE69917644T2 (en) 2005-06-30

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