SPIRIT STOVE

Abstract: Apparatus for burning spirit or similar liquid fuel having a container (2) filled with a fuel absorbing mass with a partly exposed surface from which the fuel being burned is evaporated. A draught or burner tube (7) is so arranged with respect to the exposed surface service that inlet flow of combustion air into the tube is safeguarded. The fuel container comprises a central opening which is limited by an edge part (5) which extends upwards with respect to the top surface of the container and with which a moveable control- and extinguishing device is arranged to cooperate by completely or partly covering the opening for control- and extinguishing purposes. A seat ring (12) is placed between the edge part (5) and a control- and extinguishing plate (8) at such a distance above a heat protective metal plate that spirit vapor and remaining flames if any are burned out between the control- and extinguishing plate (8) and the heat protective metal plate (10) above the last mentioned.

Description: Spirit stove This invention relates to an apparatus for burning spirit or similar liquid fuel having a fuel container filled with a fuel absorbing mass with partly exposed surface from which the fuel being burned evaporates and a draught- or burner tube being so arranged with respect to the exposed surface that inlet flow of combustion air into the tube is safeguarded the fuel container being separate and removable from the remaining parts of the apparatus and having top-, bottσm- and side walls enclosing the absorbing mass the top wall for providing the exposed surface comprising a central opening which is limited by an edge part of the top wall extending upwards with respect to the top surface of the container, the edge part having an annular upper surface with which a movable control and ex¬ tinguishing device cooperates by partly or completely covering the opening for control and extinguishing purpose. A general purpose of the invention is to achieve an arrangement facilitating the burning out of spirit vapors and remaining flames if any between the control device and the heat protective metal plate which is arranged to protect the heat sensitive parts of the fuel container. A further purpose of the invention is to create an arrangement preventing too large power from being taken out. According to a first aspect of the invention an apparatus of the type described above is characterized by a seat ring which is placed between the annular upper surface and a control- end extinguishing plate at such a distance above a heat protective metal plate surrounding the upwards extending edge part for completely or partly covering the opening, that spirit vapors and remaining flames if any are burned out between the control- and extinguishing plate and the heat protective metal plate above the lastmentioned. The seat ring may have a smaller inner diameter and/or a larger outer diameter than the upwards extending edge part. The seat ring can also be supported by the heat protective metal plate for instance at a fixed distance above the later which mainly corresponds to the height of the upwards extending edge part, or the seat ring can be resiliently supported by the heat protective metal plate for instance be fastened to it by means of leaf springs. According to another aspect of the invention the control and extinguishing device comprises at least two mainly segment- or crescent shaped plates which are movably linked to each other and connected to a control means which is arranged for allowing variation of the opening surrounded by the plates between completely closed position and a maximal opening position. The plates can each via an arm be pivotally connected to the heat protective metal plate each at pivot point placed outside the plate. At each pivot point a follower link is connected to the corresponding arm, the follower links at two adjacent pivot points engaging each other in order to achieve a syncronuos movement of the associated plates towards or away from each other when operating one of the follower links by means of an outer control device. In order to safeguard a simple and suitable control of the segment - or crescentshaped plates the follow link relating to one of the arms comprises the pivot point of said arm between the connecting point of the link with the arm and the link connecting point with the other follower link, the first follower link supporting a control arm with which the control device is engaged in order to turn the link about said pivot point. An apparatus for burning spirit or similar liquid fluids having a fuel container filled with a fuel absorbing mass with partly exposed surface from which the fuel which is being burned evaporates whereby a draught or burning pipe is so arranged with respect to the exposed surface that drawing of combustion air into the tube is safeguarded and the fuel container comprises a central opening which is intended to partly or completely be covered by a control - and extinguishing device, is according to a further aspect of the invention charac¬ terized in that a removably, above the burning pipe arranged flame spreader supports a locking device engaging the link mechanism of the control- and extinguishing device arranged to limit the movement of the control and ex¬ tinguishing device in the direction of uncovering the central opening. The invention will now be described more in detail below with reference to the accompanying drawings on which Fig. 1 shows an exploded perspective view of the active parts of a spirit stove according to a first embodiment of the invention Fig. 2 shows the parts according to fig. 1 in a side elevation view with certain parts partly in section Fig. 3 shows an exploded view of the active parts of a spirit stove according to a second embodiment of the invention Fig. 4 shov/s a side elevation view partly broken of the spirit stove mechanism shown in fig. 3 with certain parts in fig. 3 left aside and Fig. 5 shows a top view of the spirit stove mechanism according to fig. 3 ex¬ tinguishing- and control device. The drawings only show the necessary mechanismes of the spirit stove understanding the aspects of the invention. Consequently the outer covers of the sp stove, the support for the pots and pans, etc. are omitted. Concerning such details spirit stoves on the market it is referred to the spirit stove models No. 4000, 50 D4, D3, 2500, C7, K2, C5 and 2000 of Aktiebolaget Jobo. For the same purpose it is referred to the originally published text of the European patent applicat No. 81902014.0. Further it is generally referred to the content of said European pat application text and the European patent which was sealed on the 17th April, 1985. In the drawings similar or similarly operating parts of the different embodime have been provided with the same references. In fig. 1 a fuel container 2 which is closed comprises at its top wall 3 a cent opening 4 which is limited by an, with respect to the remaining parts of the top surfa upwards extending edge part 5 having an annular upper surface 6. The fuel containe is filled with a fuel absorbing mass with an exposed surface in the central openin from which surface the fuel which is to be burned evaporates. The fuel container separate and removable from the spirit stove. A draught - or burner tube 7 is so arranged with respect to the exposed surfac that the flow of combustion air into the tube is safeguarded. Below the burner tube control and extinguishing plate 8 is provided in order to partly or completely cover central opening 4 for control- and extinguishing purpose. The burner tube 7 is by means of arms 9. fastened to a heat protective me plate 10. The plate 10 has a mainly central opening with a diameter mainly cor sponding the outer diameter of the edge part 5 and covers the container about upwards extending edge part 5 at a level which is situated below the annular sha upper surface 6. A seat ring 12 for the control - and extinguishing plate 8 is by means of two l springs 14 fastened to the heat protective metal plate 10 so that it abuts the up surface 6 of the upwards extending edge part 5. The seat ring 12 has, according to embodiment shown, a larger outer diameter and a smaller inner diameter than t upwards extending edge part 5. At the center of the plate 8 an operating arm 15 is shown which in a kno manner is pivotally supported and by means of a handle 16 extends outside the cov not shown, of the spirit stove in order to operate the control- and extinguishing plat from outside by turning the arm 15. In fig. 2 the plate 8 is shown in a positi completely covering the exposed surface and abutting the seat ring 12 which in t abuts the upper annular surface 6 of the upwardly extending edge part 5. The embodiment shown in fig. 3-5 differs from the one according to fig. 1 and mainly by the replacement of the control- and extinguishing plate 8 and the seat ring 1 by another control mechanism. This control mechanism comprises two crescent shaped plates 18 and 20 which ar movably connected to each other by, arms 24 and 26, being pivotally connected to th heat protective metal plate 10 at pivot points 28 and 30 which are placed outside eac plate 18, 20. A follower link 32 and 34 respectively is fixed to a corresponding arm 24 and 2 the follower links 32 and 34 engaging each other at 40 in order to achieve syncronou movement of associating plates 18, 20 towards and away from each other when movin the follower link 32 in a way which is described below by means of an outer operatin device. Said engagement at 40 is achieved by an upwardly extending tounge 42 of th follower link 32 which is movably guided in an endslot 44 on the follower link 34. As clearly appears from fig. 5 the follower link 32 of the arm 24 is pivotall fastened to the heat protective plate 10 at the pivot point 28 between the connectin point of the link 32 with the arm 24 and the connecting point 40 between the link 32 an the follower link 34. The follower link 32 supports an uppwardly extending operatin arm 46. The arm 46 comprises a vertical slot 48 in which one end of a crank pin 50 i inserted the other end of which supports an operating knob 52. The arrangement 46 - 5 is at the shown embodiment in principle a known design and admits turning of th link 32 about the pivot point 28 in order to adjust the plates 18 and 20 with respect t each other so that the opening surrounded by them can be varied between a completel closed state in which the surface 4 of the fuel mass is completely covered and maximal exposed surface corresponding to the total surface 4. A combined radiation - protective and spill over metal plate 56 Is by means of screw joint, not shown in detail, fastened at upwardly extending lugs 58 of the he protective plate 10. At 60 and 62, respectively screw holes are shown in the plate 5 and In the lugs 58. One of said lugs 58 comprises a bear ring hole for the crank pin 50. The metal plate 56 comprises a central opening 64 for the burner tube 7. Th opening 64 is surrounded by upwardly extending center lugs 66 for a flame spreader 6 positioned above the opening 64 when necessary. The flame spreader 68 is cup shape and has flame openings 17 equally placed about its upper inclined edge and is fastened the spirit stove should be used as a heating device. At the upper side of the flame spreader 68 one end of a bent locking arm 72 fastened. When using the flame spreader the bent arm 72 extends through a hole 74 the metal plate 56 and into the moving path of the plate 18. The hole 74 is situated that when the flame spreader 68 is used the exposed surface 4 is only uncovered to certain degree since the control- and extinguishing plate 18, abuts the locking arm as shown with dash dotted lines 18 in fig. 5 whereby the possible power take out limited. If the control and extinguishing device 18, 20 has such a position that the plate is outside the position 18 fastening of the flame spreader is prevented since the lock arm 72 then abuts the upper surface of the plate 18. In the embodiments shown above there is a distance between the heat protect metal plate 10 and the seat ring 12 and extinguishing plates 18, 20, respectively wh facilitates spirit vapor and remaining flames if any to burn out between the cont mechanism and the heat protective plate above the lastmentioned. The invention is of course not limited to the described and shown embodime but can be a varied within the scope of the attached claims. For instance the seat ri can directly or indirectly be fastened to the burning tube instead of being fastened the heat protective plate.

Claims: Claims 1. Apparatus for burning spirit or similar liquid fuel having a fuel container (2) fille with a fuel absorbing mass with a partly exposed surface from which the fuel bein burned evaporates and, a draught or burner tube (7) being so arranged with respect t the exposed surface that inlet flow of combustion air into the tube is safeguarded, th fuel container being separate and removable from the remaining parts of the apparatu and having top-, bottom- and sidewalls enclosing the absorbing mass, the top wall fo providing the exposed surface comprising a central opening (4) which is limited by a edge part (5) on the top wall extending upwards with respect to the top surface of th container, the edge part having an annular upper surface (6) with which a movabl control- and extinguishing device cooperates by partly or completely covering th opening (4) for control- and extinguishing purpose, characterized in that seat ring (12) is placed between the annular upper surface (6) and a control- an extinguishing plate (8) at such a distance above a heat protective metal plate (1 surrounding the upwards extending edge part (5) for completely- or partly covering th opening (4), that spirit vapors and remaining flames if any are burned out between th control- and extinguishing plate (8) and the heat protective metal plate (10) above th lastmentioned. 2. Apparatus according to claim 1, characterized in that the seat ring (1 is supported resiliently by and above the heat protective metal plate (10). 3. Apparatus according to claim 2, characterized in that the seat ring (1 is fastened by means of leaf springs (14) at the heat protective plate (10). 4. Apparatus according to claim 1, characterized in that the control- an extinguishing plates (8) and the seat ring (12) is replaced by at least two mainl crescent shaped plates (18, 20) which are movably linked to each other and connected t a control means (24-52) which is arranged for a allowing variation of the openin surrounded by the plates (18, 20) between a completely closed position and a maxim open position. 5. Apparatus according to claim 4, characterized in that the cresce shaped plates (18, 20) each via an arm (24, 26) are pivotally connected to the he protective metal plate (10) at a pivot point (28, 30) for each arm situated outside t plates (10). 6. Apparatus according to claim 5, characaterized in that at each piv point (28, 30) a follower link (32,34) is fixed to a corresponding arm (24,26) the follow links (32,34) at two adjacent pivot point (28,30) engaging each other in order to achie a syncronous movement of the plates towards and away from each other when operati one of the follower links (32) by means of an outer control device (52). 7. Apparatus according to claim 6, characterized in that the follw link (32) of one arm (24) comprises the pivot point (28) of said arm between the conne ting point of the link (32) to the arm (24) and the point (40) of engagement of the li with the other follower link (34) whereby the first mentioned follower link (32) suppo an operating arm (46) connected to the control device (52) in order to turn the link ( about said pivot point (28). 8. Apparatus according to claim 1, characterized in that a remova flamespreader (68) is arranged above the burner tube (7) and is provided with a locki device (72) engaging the mechanism of the control- and extinguishing device f I t limiting the movement of the control- and extinguishing plates (to 18, 20) in direction uncovering the central opening (4). 9. Apparatus according to claim 8, characterized in that the locking d vice (72) prevents the application of the flame spreader (68) if the control- a extinguishing plates (18,20) are in such a position with respect to the central opening ( that a given maximal power take out is exceeded.

Inventors: BOIJ KARL OSKAR ARNE, BOIJ, KARL, OSKAR, ARNE
Applicants: BOIJ KARL O A, BOIJ, KARL, OSKAR, ARNE
Application year: 1987
Main classification: A47J36
IPC codes: A47J36, F24C5