US1809652A - Blowpipe - Google Patents

Description

June 9, 1931. J. E. VINCENT BLOWPIPE Filed March l. 1929 Patented June 9,' A1931 i Jaime E. vINoEN'r, or JOHNs'rowN, rnimsnvaiiia BDOWPIPE Application led March 1,

This invention relates to blowpipes such as are employed inthe art of cutting with gases,

and more particularly to a blowpipe which is j especially adapted for the eioient combustion and use of natural gas at the standard low pressure at which natural gas is commercially furnished. y

Heretofore, with blowpipes of the class to which this invention'belongs, it has been necessary to materially boost the pressure of natural gas in order to use such gas, thus entailing extra expense and labor. The blowpipe of the present invention is designed to use natural as at the standard commercial pressure of om eight to nine ounces.

Another and important object is to provide an integral key for lockin the inner and outer tips againstV rotation, this feature having the dual advantage of bei-n an integral part of the tip and therefore ed a ainst misplacement, and also bein an integra part of the tip it is formed of t e same metal as the tip and has the same rate of expansion and contraction as the tip and, therefore, will lnot bind.

In the drawings: Y Figure 1 is a vertical sectional view through the head and top of a blowpipe embodying my invention.

Figure 2 is a side'v elevation of the inner tipFmember.

igure 3 is a transverse section taken on the line III-III of Figure 1. v

Figure 4 is a transverse section taken on the line IV-IV of Figure 1.

Referring more particularly to the drawings, the numeral 1 desi ates the head of the blowpipe, neck 2 having in the upper portion thereof a branched passageway 3 communicating at its forward end with a chamber `4, an upwardly inclined passageway 5 and a second upwardly inclined passageway 6. Communi- 45 eating with the rear or receiving ends of the and 9 which serve to conduct cutting oxygen, preheating oxygen, and combustible gas, respectively, thereto. -The upper end ofthe passageway 5 communicates with a chamber 10 formed by a bore extending downwardly said head being provided with a gr passageways 3, 5 and 6 are the pipes 7, 8

192s. serial No. 343,647.

and forwardly into said head and having lthreaded therein the body 11 of an injector,

the saidinjector having a stem 12 mounted in said chamber and an operating head 13, there being packing 14 interposed between 55 `said head and seat 15 on top of the head.

This injector is provided with a central bore 1 6, the upper end ofv which communicates by lateral ports 17 with the chamber 10.. The lower end of the injector is adapted to discharge centrally into an inclined passageway 18 which in turn discharges into an annular chamber 19 provided in the lower portion of the blowpipe head and surrounding the inner tip member, to be described hereinafter. The passageway 6 discharges into a chamber 20 surrounding the lower end of the said injector and communicating` with the passageway 18. 'Extending downwardly from the chamber 4 is a short passageway 21, which merges 70 with an enlarged threaded bore 22 extending tothe chamber 19.

lThreaded into the said bore 22 is an inner tip member, indicated generally at 23. This member comprises 4an upper threaded por- 75 tion y24 cooperating with the thread in the bore 22 and is provided with a rounded head 25 adapted to seat against the rounded upr end of said bore.

The tip 23 is cut away intermediate its 80 ends to provide a portion 36 of reduced diameter which cooperates with the outer tip member 32 to form a mixing chamber 36 of over halffthe length of the outer tip member 32. j 85 The inner tip member 23 is provided with a plurality of relatively large V-shape'd ooves 27 extending lon 'tu inally from the threaded portion 24 to t e cut-away portion 36. The grooves 27 are of such size that 90 their cross-sectional area is at least equal t0` half the cross-sectional area of the mixing chamber 36. i

The portion 28 of the tip 23 below the mixing chamber 36 is tapered to correspond to 95 the tapered nose of the outer tip 32 and is provided with V-sha d grooves 37 through which the mixture o gases from the mixing chamber 36 pass. The inner tip23 is provided with a central bore 30 for conducting cut- 1C ting oxygen from the chamber a to the central outlet orifice 3l,

The outer tip member 32 fits within the lower end of the head 1 and surrounds the lower portion of the inner tip member 23. This outer tip member has a cylindrical upper portion 33 adapted to lit within the lower end of the head and to lit snugly about the cylindrical body of the inner tip 28, thus sealing the outer sides of the grooves 2?., For the purpose of securing the two members together an integral hey projection 31E: is provided on the inner surface of the outer member 32 and a key-way 35 `is formed in the inner tip member. This manner of connecting the inner and outer tip members has proved of great advantage in the quick and eliicient assembling of said members. Also by providing an integral key, there is no chance or" the key becoming lost, and the key being formed of the same material as the tips the expansion and contraction of the lrey and hey-way will be the same and, therefore, the key will not be loosened nor will it bind as is often the case when the keys are composed of di'erent metals.

It will be noted that the lower end of the outer tip member projects beyond the lower end ofthe inner tip member, thereby providing a Jfrusto-conical chamber 38. This chamber 38 has been found to be of benet in that it provides or the use of gases of high igniting point without danger oiE blowing out the flame through the pressure of the oxygen delivered through the orice 3l, since it shields the preheating liarne from 'drafts or currents of air induced by the jets and flowing longitudinally of the blowpipe. Furthermore, this chamber serves to preheat the oxygen, thereby producing a more intense .end of such head and comprising a packing 40 compressed into the joint between such head and tip.

In operation, oxygen 'for preheating purposes and the combustible gas having been turned on, the oxygen delivered through the injector will thoroughly commingle with the combustible gas in the passageway 18 and the chamber 19 and will be delivered through the grooves 27 into the chamber 36 where they will be further mixed, and the mixture will then pass through the grooves 37 into the chamber 38. The metal will be quickly preheated and at a substantially single spot, after which cutting oxygen will be supplied from the chamber 4 and the passageway 30 and will operate to cut or soften the metal.

While I have shown and described one specific embodiment of my invention it will be understood that I do not wish to be limited thereto, since various modifications may be madeA without departing from the scope thereof, as dened in the appended claim.

Ir claim:

A blow pipe of the character described comprising a head,'a tip carried by said head and comprising an inner tip member having a central passageway for cutting oxygen, an outer tip member surrounding said inner tip member, said inner tip member having a materially reduced diameter for more than half of its length within said outer tip member so as to form a mixing chamber of material size, a plurality of V-shaped Orooves in the portion of said inner tip member above said reduced diameter portion, the combined cross-sectional area of said V-shaped grooves being at least half of the cross-sectional area of the space formed by said reduced diameter portion and said grooves extending from above said outer tip member into said space formed by said reduced diameter portion, and the lower end of said inner tip member below said reduced diameter portion being also provided with a plurality of V-shaped grooves for the passage of the mixture of ases from said mixing chamber, and means or supplying cutting oxygen to the central passageway in said inner tip and a mixture of preheatin oxygen and a combustible gas to the V-shape grooves in said inner tip. y

In testimony whereof, I have hereunto set my hand. JAMES E. VINCENT.

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