US2643622A

US2643622A - Blowpipe

Info

Publication number: US2643622A
Application number: US11195A
Authority: US
Inventors: Meincke Edward; Hugh T Smith
Original assignee: Union Carbide and Carbon Corp
Current assignee: Union Carbide Corp
Priority date: 1943-04-21
Filing date: 1948-02-26
Publication date: 1953-06-30
Anticipated expiration: 1970-06-30

Description

June 1953 MEINCKE EI'ALI BLOWPIPE Original Filed April 21, 1943 INVENTORS EDWARD MEINCKE HUGH 1.5mm

ATTORNEY atented June 30, 1953 2,643,622 :ELOWRI-PE dwa dMeinQke,1Summit, ,N. ;J., r and Hu Smith, 'Chicago,'--I-ll., assignors to 'UnionGarbide and Garbon Corporation, a corporation of New York .Qrig inal application April 21, ,1 943,,.seria1 No. 483,874. IDivi'dedand this applieationEebruary "This inventionrelates to blowpipeapparatus for thermochemically removing metal bya stream or jet of oxygen from metal bodies having a composition which resists the normal thermochemical action of a stream or jet of -oxygen,-such-resistance bein .suiiicient-tohinder-or substantially prevent such normal removal=of-metal. Examples of such metal bodies are ferrous'metals, such as stainless steels-cast iron, and the like,-and nonferrous metals, such as--copper, aluminum,nickel and various'a'lloys. Such'metal bodiesare dimcult or impossible to cut, deseam, desurfaee or the like by the normal impingement of a 'st'ream of oxygen upon successive portions heated to their ignition temperature. However, they ean -now be cut, deseamed;and'desurfaced thermochemically by blowing into the reaction zone along with the oxygen jet a stream of powdered oxidizable adjuvantmaterial, such as powdered iron.

Among the objects of the-present invention are to provide blowpipe apparatus having means for rapidly starting and stopping the flow of finelydivided adjuvant powder .to .atherniodhemical reaction zone; to provide blowpipe-apparatus having means for automatically. starting and stopping the flow of oxygen andpowdered material in a predetermined sequential relation to one another; and to provide otherieatureswhich will'be. apparent as'the following description proceeds.

Apparatus -constructed=in aecoi'danoe with this invention is illustrated "the accompanying drawings, in which Fig. 1 is a side elevational View, partly broken away and in section, of a blowtorch embodying the invention;

Fig. 2 is an enlarged longitudinal sectional view of the head end of the blowtorch shown in Fig. l; and

Fig. 3 is a cross-sectional view taken along the line 3'3 of Fig. 2.

In the embodiment of this invention illustrated in Figs. 1, 2, and 3, a nozzle II is secured in a head I3 by an annular nut [5, in a well-known manner. The nozzle II has annularly arranged longitudinal preheat passages H for a combustible preheating medium, and a central longitudinal oxygen passage I 9. Near the rear end of the nozzle H a series of ports 23 for powder are drilled transversely through the wall of the nozzle and the liner 2| to the oxygen passage IS. The ports 23 are located between the preheat passages H, as shown clearly in Fig. 3, and are inclined forwardly toward the axis of the nozzle. An oxygen discharge tube 25, which has an annular flange adjacent to its rear end fitting snugly in the rear end of-thepassage 19, is carried-bythe nozzle II and extends forwardly inspaced relanon-to the wall-of thepassage 19 to a point well ahead of the ducts 23 andspaced from the outlet of the passage 1-9. The-front portion of the tube 25 carries a plurality of laterally extending fins 22] fitting snugly "in'the passage t9 and breaking down into a plurality of small ducts the annular space-around the tube.

' A"C OI11buStib1e preheating-medium,such. as an oxyacetylene mixture, may be distributed to the passages 1;! 1 by -'an.-annular distributing chamber '3! supplied by ae' nduit-sa s ecured"inia connecting bor e filrinthe-head -l 3.

jFinely-divided adjuvant mater'i'al may be. sup-- plied to the ports 23;. and thence to the .annular -s'pace 29,' by a-tube 31 secured in aconnecting bore 39 leading into an annular chamber .4 I surrounding-a rear portionof the nozzle I:I ,A' suitable source of powder, as shown in :Fig. '1, may comprise a closed -ho'p per tfi connected to .the blowpipeby-a'fiexible hose 42, andhaving an inlet pipe Ml through Whichgasunder pressuremay enter above the powder level.

Oxygenenters the d-ischargetube'25 through a conduit it-secured in abore. 45 in head 'l3, andis-then' discharged'into the relatively large passage; IB aSp'irating into the passage a plurality of small streams #of powder flowing smoothly in substantially a straight line from the annular space 29. "The-powderan'd oxygen mix intimately -together:-while -passmg=-along the passage I 9,. and may be 'd-ischargedag'ain's't a bodyof metal pre- -heatedtby the flames from-the passages ii, thereby removing metal from the body thermochemically.

Adequate gas-tight seals preventing the passage of gas into or out of the annular chamber 31 are provided by two annular conical seats 46 and 48 on the rear end of the nozzle l I, which seat tightly on corresponding seating surfaces in the body I 3.

It is desirable that powder from the passage 39 be controlled so as to enter the nozzle 1 I only when metal-removing oxygen is flowing through the tube 25. This is accomplished by placing a suitable shut-off valve 41 in the bore 39 of the head [3. The valve 47 illustrated, by way of example only, is an ordinary rotatable plug valve secured in a cross bore 49 of the head I3 and having a through passage 5| which may be rotated into and out of register with the bore 39. The valve d1 includes a stem 53' projecting from the side of the body It; and engaging a crank 55 to which an operating rod or wire 5? is attached by a set screw. With this arrangement, the operator of the blowpipe can start or stop the flow of powder to the nozzle II by manipulating the wire 57.

In Fig. 1 there is shown an arrangement whereby the operator may control in unison the flows of powder and metal-removing oxygen to the nozzle H. The blowpipe handle 59 has the usual long lever Bl; fulcrumed between its ends, and engaging at its rear end the stem 63 of a spring-closed valve controlling the flow of metalremoving oxygen to the nozzle I l. The lever 61 is connected through a suitable linkage 65 to the connecting rod 57, the construction and arrangement being such that when the operator actuates the lever 61 to start or stop the fiow of oxygen, the powder control valve 41 is rotated to start or stop the flow of powder. The linkage may be such that the fiows of oxygen and powder start and stop simultaneously, or any other predetermined sequential relation may be maintained.

The particular linkage 65 shown in Fig. 1, by way of illustration only, comprises a rotatable element 67 pivoted at 69 to a stationary support H within the handle 59. An L-shaped connecting link 13 is pivotally secured at one end to the element 67 on one side of the pivot 69, and at its other end to the valve-operating lever 6|, whereby movement of the lever 6| causes the element 61 to turn through part of a revolution. A turn-buckle 15 is pivotally secured at one end to the element 67 on the opposite side of the pivot 59, and at its other end grips the connecting rod or wire 51, whereby rotation of the element 67 opens or closes the valve 47. A return spring 77 is secured at one end to the handle 59, and at its other end engages the pivoted element 6'1, for assisting the return of the lever 6| to its raised position when released by the operator, thereby closing the oxygen control valve 63 and the powder control valve 47. r

This application is. adivision of our application Serial No. 483,874, filed April 21, 1943, Patent No. 2,444,900 granted July 6, 1948.

What is claimed is:

1. In a. blowpipe having a handle, a head havoperating said first valve; reciprocable valve actuating means extending from said handle to said second valve; and means linking said lever to said reciprocable means whereby movement of said lever results in movement of said second valve.

2. A manually operable o-xy-acetylene powder scarfing blowpipe comprising the combination with an oxy-acetylene deseaming torch including a tubular handle through which extend elongated conduits for conducting cutting oxygen and conducting a combustible gas mixture of oxygen and acetylene, manually operable lever means mounted on said handle for controlling the cutting oxygen delivered to the cutting oxygen conduit, a head connected to said conduits,

and a nozzle connected to said head, said head I arate powder supply line extending through said handle and connected to said head, said nozzle having lateral ducts for conducting powder to the interior of the nozzle, and said head having an annular chamber communicating with such ducts, said head also having a powder passage connecting said powder supply line to said annular chamber, a powder valve mounted on said head for controlling the fiow of powder supplied through said passage, and powder valve operating means comprising a flexible connecting rod operatively associated with said valve and said lever means, and spring means within said handle acting through said fiexibie connecting rod to close said valve.

EDWARD MEINCKE.

HUGH T. SMITH.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,178,551 Stolle et a1 Apr. 11, 1916 1,237,535 Martin Aug. 21, 1917 1,266,858 Reyburn May 21, 1918 1,412,656 Jenkins Apr. 11, 1922 2,221,825 Van Triest Nov. 19, 1940 2,283,932 Jones May 26, 1942 2,817,936 Nicholson et a1 Apr. 27, 1943 FOREIGN PATENTS Number Country Date 18,234 Great Britain Aug. 2, 1916