US2476246A - Blowtorch - Google Patents

Description

July 12, 1949. R. l.. LIVINGSTON BLOWTORCH 2 Sheets-Sheet 1 Filed 001'.. ll, 1946 July 12, 1949. R. L. LIVINGSTON v 2,476,245 BLQwToRCH Filed oct. 11, 194e 2 Sheets-Sheet 2 @Hof/MMA Patented July 12, 1949 UNITED STATES PATENT OFFICE BLOWTORCH Robert L. Livingston, Williamsport, Pa.

Application October 11, 1946, Serial No. 702,611

4 Claims.

This invention relates to improvements in blow torches. An object of the invention is the provision of a quick lighting and self-generating double duty blow torch in which a friction hinge is employed between a primer and a fuel tank carrying a combustion tube for regulating the position of the primer relative to the combustion tube for causing rapid ignition and combustion of the fuel, the ame from the primer being extinguished after the combustion tube is in operation.

Another object of the invention is the provision of an eiiicient blow torch in which a friction hinge is used for connecting a primer with a fuel tank in such a manner that the flame from the primer may be placed at any point along the combustion tube for igniting the fuel led to said tube by a wick and for pre-heating said tube, the arrangement being such that the body of the primer may be employed as a handle when the fuel tank becomes hot after long use.

A further object of the invention is the provision of a neat and compact blow torch having a fuel tank which will not leak when held in various positions` and which may be lled in an upright position, wicks in the fuel and a priming tank being each housed in an internally threaded passage so that said wicks may be removed or replaced readily, a friction hinge connecting the fuel and priming tanks together so that the priming tank may place the flame of its wick in various positions along the combustion tube and a generator tube associated with the fuel tank, the wick in the fuel tank extending into the generator tube which projects into the combustion tube, the combustion tube being removable so that the generator tube may act as a double duty torch, the flame at the free end of the generator tube being maintained by the flame from the priming wick.

The invention consists in the novel construction, arrangement and combinations of parts hereinafter more particularly described and claimed.

In the drawings:

Figure 1 is a plan view of my blow torch.

Figure 2 is a side View in elevation of the torch with parts in section.

Figure 3 is a horizontal section through the priming tank and the fuel tank showing a connecting friction hinge.

Figure 4 is a horizontal section similar to that shown in Figure 3, but illustrating a modied form of friction hinge.

Figure 5 is a longitudinal vertical section of 2 the generator tube with the combustion tube attached.

Figure 6 is a view in elevation of the blow torch showing the combustion tube removed, and

Figure 7 is a View in elevation of the blow torch illustrating the operation of the priming tank in various positions relative to the combustion and generator tubes.

Referring more particularly to the drawings, I0 designates a fuel tank which is closed by a cover I I. A wick tube I2 inclined at an acute angle to the cover is sealed in an opening I 2 in said cover with an open end I3 projecting into the tank. A wick I4 has a portion in the tube and a portion I5 extending downwardly into the fuel in the tank. The upper outer portion I6 of the wick is disposed within a generator tube I'I.

The outer free end of the tube I2 is threaded (Fig. 5') to receive the internal threads of a filler cap 20. An insulating washer 2I is held in place on the outer end of the tube I2 by the cap 26. A slotted nut 22 is threaded onto the inner end 23 of the tube I'l and is forced tight against the washer 2| for holding the generator in position on the outer end of the tube I2.

The ller cap 20 is formed with an axial opening 20 of a diameter greater than the generator tube I1 and a second insulating Washer 24 is held in place on the generator tube I1 by means of a nut 21, which is welded or otherwise secured to the tube so as to obtain an air tight connection. The tube I'I is threaded into a combustion tube 26. The outer surfaces of the inner end of the combustion tube and the inner surfaces of the tube I1 are threaded for increasing the heat conducting area. The inner threaded surface of the tube I 'I aids in maintaining the portion I6 of the wick in position.

The outer free end of the tube I1 is counterbored as shown at 30, to receive a disk 3I which is rolled into place so that it will have an airtight fit in the counterbored groove 30. The center of said disk is provided with an orice 32 from which fuel vapors issue for maintaining combustion in the chamber in the tube 26. In this connection it is important to note that the wick portion I`6 stops inwardly a Substantial distance from the outer end of the generator tube I1 forming a vapor expansion chamber 25 and that the lower portion of the combustion tube 26 extends inwardly beyond the chamber 25.

The combustion tube 26 has a plurality of ports 33 properly arranged for supplying air in regulated proportions to said tube to maintain combustion.

A friction hinge 35 (Figure 3) connects a primer tank 3G with the fuel tank I. The hinge consists of a pair of parallel bars 3l which have the opposite ends pivotally mounted on pins 33 carried by journals 39 and :i0 at the ends of respective curved brackets :il and d2. The bracket 4| is secured to the tank l@ adjacent the upper end while the bracket li? is secured tovan intermediate portion of the tank 35. Each pivot pin has heads 43 at the opposite ends thereof for frictionally pressing the ends of the bars against the ends of the bearings.

A modified form of hinge is shown at i5 in Figure 4, in which journals 46 and 41 are connected to the respective tanksl HJ and 36. Pins 48 in the journals form pivots for a pair of parallel bars llil. Heads on the opposite ends of said pins press against the bars for holding said bars frictiona-lly in position and likewise the tank 36.

The primer tank 35 (Figure 2') has its upper open end externally threaded to receive an internally threaded filler cap 5I. An insulating washer 52 is pressed upon the upper free end of the tank 38 by the cap 5l. An ori'ce in a closure 5I-a is closed by a plug 53 threaded into said orifice. A pin 515 carried by the plug 53 projects into the upper end of the closure i-a adjacent the upper end of a priming wick which terminates in said closure. The pin or wire 54 is employed for cleaning the orifices when they become choked with carbon.

The wick 55 is held place in the tank 3S by an internally threaded sleeve 6l! upon which a closure Sl-a is threaded. The sleeve projects downwardly for a short distance into the tank 36, while the outer threaded portion Si' of the sleeve extends above the cap. The lower end of the closure is seated upon the top of the iiller cap 5|.

The operation of my device is as follows: The

tank l@ is placed in a vertical or upright position and the cap 2i) together with the attached generator Vl. The combustion tube 25 and the wick l5 is removed as a unit andthe tank is filled with fuel. The cap is then replaced together withV the wick l5 since'said wick is carried bythe cap and tube- 1T.

The'primertank 36 isL moved to a vertical` position and: is supported in this position by the friction hinge 35 from the tank lll. The filling cap 5t iis removed together with the wick 55 and the-tank 3E is supplied' with fuel. The wick andi cap are then replaced".

The closure tit-a is unscrewed and the outer end of the'wick 55 isi'gnited bya suitable means. The tank 36 is. adil'isted so that the flame 55 will play upon the' threaded portion of the combustion tube 2G for causing the*f tube il to generate-vapors'which expand into the chamber 25 and pass through the orifice 32 at the' outer end: of theI tube Il. These vaporsI are ignited by the flame 65 which is extinguished after the torchy is operating properly.

Thefheat from-the flame G5 maintains the conibustiontube 26and the generator tube H at the proper temperaturesl so vapors will be supplied tov the air drawn through the portsv 33 to maintain. the flame 66 at all times. The threads` on the interior. and exterior of the tubes l1 and 26 will', increase thel radiating surface of said tubes.

The washers-2l7 andv2 -beinglformedr of insulating materials will aid in preventing too great a rise in the temperature of the member I2 and the tank li). If, however, the tank I0 becomes too not for handling after long use of the torch, the tank 3B may be employed as a handle and the friction hinge 35 will retain the tank l0 in a predetermined position relative to the tank 35.

Referring more particularly to Figure 6, it will be seen. that the combustion tube 26 has been removed from the generator'tube Il so that a double-duty torch is acquired. At this time the flame B5 is maintained throughout the time that the flame SE-a is used and the tank 36 is adjusted by the hinge 35 so that the flame 65 will play on the outer end of the tube I1.

It will be seen that by this construction a steady and intense iiame GS will be maintained during the operation of the torch. In view of the particular arrangement of the cap 20, washers 2i, 2li and nuts 22 and? @Il of the generator I'I, the torch will not leak during operation thereof. wif-.en the tank iti is filled to a pre-determined height the inner end of thel tube l2 will prevent fuel from entering said tube when the tank isin horizontal. position, and when full pressure has developed in the fuel tank, the torch will operate in any position.

I claim:

l. A blow torch comprising a fuel tank, a priming tank, means connecting the tanks together for adjustably positioning the priming tank'relative to the fuel tank, wick tube communieating with and extending from the fuel tank, an internally and externally threaded generator tube having one end extending into the wick tube and the other or outer end provided with a vapor discharge oriiice, a ller cap'threa'ded onto the outer end of the wick tube having an axial, opening, the generator tube being disposed through said opening in axial alignment with the wick tube. insulating washers at opposite faces of the cap, nuts threaded on the generator tube and forcing the washers against the opposite faces of the filler cap, an internally and externally threaded combustion tube screwed on the generator tube and having a portion provided with air ports, a wick having one end held in the generator tube by the internal threads therein and extending from said tube into the fuel tank, and a wick in the priming tank for producing a fiame ,for heating the generator tube and igniting vapors in the combustion tube.

2. A blow torch comprising a fuel tank, a wick tube projecting from and in communication with said tank, a ller cap on the free end of the wick tube and having an axial opening, an externally and internally threaded generator tube for producing fuel vapors extended through the opening and having one end projecting into the wick tube, said generator tube being of a diameter less than the opening of the ller cap, a combustion tube having one end threaded onto the other end of the generator tube, the other end of the combustion tube being provided with air ports, the outer end of the generator tube having a vapor discharge orifice, a wick disposed in the generator tube stopping inwardly of the discharge orifice forming a vapor expansion chamber, the wick also being disposed in the wick tube and the tank and having a portion held in place by the internal threads of the generator tube, said 'generator tube, combustion tube, cap and wick being removable as a `unit from the tank, and a lamp connected to the tank for playing a flame on the generator tube and for igniting vapors issuing from the generator tube.

3. A blow torch comprising a fuel tank, a wick tube projecting from and in communication with said tank, a filler cap on the free end of the Wick tube and having an axial opening, an externally and internally threaded generator tube for producing fuel vapors disposed through the opening and spaced therefrom and having one end projecting into the Wick tube, a combustion tube having one end threaded onto the other end of the generator tube, the other end of the combustion tube being provided with air ports, the outer end of the generator tube having a vapor discharge orifice, a wick disposed in the generator tube stopping inwardly of the vapor discharge orifice to denne an expansion chamber, the wick also being disposed in the wick tube and the tank and having a portion held in place by the internal threads of the generator tube, said combustion tube being removable from the generator tube so that the generator tube at the orice will produce an intense pencil-like flame after the generator tube has been heated and the vapors eXuding from the orice are ignited, and a lamp connected to the tank for playing a name on the generator tube and for igniting vapors issuing from the generator tube.

4. A blow torch comprising a fuel tank, a priming tank, a fuel vapor-generator communicating with the fuel tank and a combustion tube having a portion embracing the generator with the remaining portion of said tube extending outward ly from the generator, said priming tank having means for producing a flame for igniting the vapors in the combustion tube, and a friction hinge connecting the tanks together whereby the flame from said priming tank may be directed at any point along the combustion tube.

ROBERT L, LIVINGSTON.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,966,250 Lasher July 10, 1934 2,045,956 Lenk June 30, 1936 2,094,259 Brody Sept. 28, 1937 2,102,404 Brody Dec. 14, 1937 2,188,460 Levit Jan. 30, 1940

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