US2483467A

US2483467A - Blowpipe

Info

Publication number: US2483467A
Application number: US589132A
Authority: US
Inventors: Homer W Jones
Original assignee: Linde Air Products Co
Current assignee: Linde Air Products Co
Priority date: 1945-04-19
Filing date: 1945-04-19
Publication date: 1949-10-04
Anticipated expiration: 1966-10-04

Description

H. w. JONES BLOWPIPE Filed April 19, 1945 INVENTOR HOMER W. JONES BY ATTORNEY Patented Oct. 4, 1949 hair-ED STATES PATENT orrice nearer W.-'.FOIiS; Westfield, N. Ji, -ass ignor to Tlie -Linde Air Products Company, a corporation of "Ohio Application April 19, 1945; "serial in. $89,132 4 Claims. (01. 1-5s 27:-4)

This inveh'heh relates to hioivpipes, and more particularly to blowpipe nozzles, theforv/ard'ends of which engage and are guided by a surface which is acted upon by a stream discharging from the nozzles.

In certain'nietal-working operations, e.'g., when deseahnh steel billets and the like, the work surface is heated to ignition temperature and an oxi dizingjgas stream is applied obliquely against successive portions of the so heated'metal'surface "to remove metal from such surface. 'Nozz les employed for this purpose usually include an oiiygen passage extending along or parallel with the axial center line of the no-zzleand -a series of heating gas passages parallel with the large oxygen passage or convergingtowardthe forward end of the nozzle; and usually, but not necessarily, spaced circumferentially about the oxygen passage.

The nozzle is usually held so that its axis is obliquejand makes a sharp angle with thesur fac'eof the workpiece and the'noz'zleis 'guide'dib'y and'p'iished along the workpiece in the dire ctidr'i 6f the issuing oxidizing gasstream, thus wearing away the front periphery and the peripheral porti onsbehind the frontface ofthe nozzle body and exerting a rearward thrust against the latter, Such guidance of the nozzle by contacting its end with the metal surface is especially 'des'i rable when hand-operated deseaming blowpip'es are moved along the surface to be deseamed because the preheating and oxidizing jets may then be maintained in accurate positions with respect to the work surface during relative movement, irre spective of the surface contour of the w n; Thus, uniform removal of metal along the surface can be accomplished. s V y Rapid wear and deterioration will'o'ccurjatfthe periphery of the nozzle adjacent but behind'its front face when such periphery continuallyen gages the surface of a workpieceto guide the nozzle while held obliquely against the workpiece, especially during a deseaming orotlier thermoe chemical operation, because Qfthe-intense-heat adjacent the nozzle andin contact with the-work.

In accordance with prior art there has been provided a deseaming blowpipe nozzle com rising anelongated body of metal, such as-copper, having oxygen and combustible gas passagesextending longitudinally therethrough, said passages having their outlets in the front face of the-body which has a substantially cylindrical outer sur-, face; and aprotective-metal collarpermanently v teasing ardiihdthe same behindbut ed- Jae t the rrent end face thereof. The collar comprises "a metalring which is relatively thick radially an" has a'substantially greater outside diameter than thecylindrical surface ofthe body adje'ihi the ring which consists throughoutof lav'ih'e greater wear resistance than the metalof the body,- an outer circumferential portion of the ring adjacent its periphery having greet-er weer resistance than "the portion of the ring closer to the body; The ring is permane'htly secured to the body-by arelatively thin layer of bonding metal united to and covering both the entireinner peripheral surface of the ring-and the corresponding opposed outer surfaceportionof the body within the ring. I

Des'e'ai'ning nozzles thus 'are provided with a wearing "ring-of hard metal on the front end for the nozzle to ride eh ehdt protect the front end. Such-rings have in the'pa'st been fastened to "the nozzle by silver solder or by spinning or the front vend become marred, trimming off-is needed. This is difficult because of the hardring. Furthermore, thering is shortene'd andbecomes less strong. and wears out sooner. shame the ring emek in use, which freduently happens, replacement becomes a ai i h so v. A ;'I he i ain objects of this invention are to cpro-j vide novel and i'mproved means for overcoming disadvantages and difliculties of the prior, art; a desea'min'g blowpi-pe having a nozzle protected by as'leevewhich is annularly spaced from and adjustable axially withrespect to the nozzle; and nozzle protective means that is inexpensive to manufacture and maintain compared to 'the'prop'dsals of the-prior art. g I According to-the-invention, a novel coupling'is provided that bears against the shoulder, of the nozzle and holds the nozzle inthe 'blowpipe head. Suchcoupllng also has a socket provided with an internal thread at-its' far end which receives a protective-sleeve orw-tube'which-is' threaded into the coupling until its o'uterend hat a desired ldc'atioii with respect toithe outer end of the nozzle. 'FOr exainple, it may be adjusted farther eart n the nozzle end, thereby enabling an 6i- 1'iiaiy Gil- 12nozzle to function well on fuel gas? uch' hropane, "For. q' yc y i e zlesthe outer endsof the nozzle andsleeve m'ay be located "h a ommo itr Ye S la lqck-nut.'on the tube QbafS against the, socket secured in metal-to-metalcontatatto thebody end of the coupling andlocksthe assembly in adjusted position. A heat-insulating air gap is provided between the sleeve and the nozzle.

Should the sleeve become damaged so it cannot be used, it can be easily replaced. Should the nozzle front end require trimming, all that need be done is to screw the sleeve further into the coupling and lock it in its new position. Also, the sleeve covers the otherwise exposed lateral surface portion of the nozzle, thereby preventing bending and marring of the nozzle.

Referring to the drawings:

Fig. 1 is an exploded view mainly in section of a blowpipe exemplifying the invention; and

Fig. 2 is a view mainly in section of the assembled parts shown in Fig. 1.

The deseam'ing blowpipe B includes a head H and a nozzle N. The head H is provided with an oxygen inlet 8, a socket l8 having a frusto-com'cal female seat (2, an annular recess I4, a fuel gas inlet 16, a frusto-conical female seat 18, and a threaded portion 20. The inner end portion of the nozzle N is adapted to be inserted in the socket and is shaped to provide a frusto-conical male seat 22, an annular recess 24, a frusto-conical male seat 26, and an annular shoulder 28. When the nozzle and head are assembled, the female seats l2 and I8 fit the corresponding

male seats

22 and 26, so that leakage between the oxygen and fuel gas inlets as well as to the atmosphere is prevented. The seats are hermetically sealed by a hollow nut or coupling member C having a threaded male portion 36 engaging the threaded portion 26 of the socket. The inner end of the member C bears against the shoulder 28.

The member C is provided with an internally threaded socket 32 for receiving the threaded inner end portion 34 of a protective sleeve S. The sleeve S is secured in adjusted position in the socket 32 on the coupling member C by a lock-nut L. The outer surfaces of the socket 32 and lock-nut L are non-circular or hexagonal for cooperation with a wrench (not shown). The lock-nut is also provided with a protecting flange or skirt 35 surrounding the sleeve S in spaced relation.

The nozzle N comprises an elongated body composed of ductile metal, such as copper having an outer annular surface portion 36 of constant diameter, in the illustrated example, ex-

tending longitudinally from the shoulder '28 to r the outer end face 38 of the nozzle. The corresponding internal annular surface 40 of the sleeve S is concentric with and radially spaced from the nozzle, thereby providing an annular heat-insulating substantially dead air gap 42 between the sleeve and the nozzle. Thus, the nozzle N and the sleeve S are separated throughout the length of the sleeve by such air gap. In cases where the shape of the outer surface of the nozzle is not of constant diameter, the protective sleeve is shaped so that its inner surface corresponds to the outer surface of the nozzle, so as to provide insulating space therebetween.

The parts of Fig. l are assembled as shown'in Fig. 2 with the outer end 44 of the sleeve S flush with the end face 38 of the nozzle N. When the length of the nozzle N is reduced by dressingback or when the nozzle is replaced by one of different length, the axial position of the sleeve S may be readily adjusted as desired. Also, when one side of the sleeve wears, the sleeve may be circumferentially adjusted as desired.

The sleeve may be composed of any desired metal such as copper or stainless steel or nitrided steel. A hard metal facing 45 composed of Stellite alloy, for example, may be applied to the front end of the sleeve, when the latter is composed of softer metal such as steel or iron; but when the sleeve itself is composed of hard metal such facing may be eliminated. In any case the invention is less costly than proposals of the prior art, and the annular air space between the nozzle and the sleeve, being sealed at its inner end, provides an excellent insulator which protects the nozzle from excessive heatmg.

What is claimed is:

1. In combination, a blowpipe head having a socket, a blowpipe nozzle having an end portion seated in such socket, a hollow coupling member removably connected to said head and securing said nozzle in place in such socket, and a nozzle protective sleeve adjustably connected to said hollow coupling member, said sleeve surrounding the adjacent outside surface portion of said nozzle in uniformly spaced relation throughout the length of the sleeve and extending axially at least to the outer end of the nozzle, said hollow coupling member cooperating with said nozzle and said sleeve to seal the inner end of the sleeve, the space between the sleeve and nozzle containing substantialiy dead air which thermally insulates the nozzle from the sleeve.

2. The combination with a blowpipe head having a socket, a nozzle having an end portion mounted in such socket, of a hollow nut threadedly securing said nozzle and head together, said hollow nut having a socket, a nozzle protective tube having one end adjustably threaded to the socket portion of said hollow nut, and a lock-nut securing said tube in adjusted position to said hollow nut, said hollow nut and lock-nut cooperating with said nozzle to effectively seal the inner end of the sleeve.

3. A deseaming blowpipe comprising a head having a socket provided with at least one annular seat and a threaded portion, a nozzle having an annular seat fitting the corresponding seat in the socket, said nozzle also having an annular shoulder, a hollow coupling member engaging said threaded portion of the socket and said shoulder, said member having a socket, a nozzle protective sleeve adjustably threaded to the socket portion of said hollow coupling memher and a lock-nut threaded to said sleeve and engaging said member, said lock-nut having a sleeve thread-protecting skirt surrounding the sleeve in spaced concentric relation, and said hollow coupling member supporting said sleeve in radially spaced concentric relation with respect to said nozzle.

4. A nozzle protective sleeve combination for attachment to a blowpipe having a head provided with a socket in which is secured one end of a blowpipe nozzle having an annular outside surface of substantially constant diameter, said combination consisting of a hollow coupling member adapted to threadedly engage such socket and secure the nozzle in place with respect to the blowpipe head, said hollow coupling member having a socket portion which is threaded, a nozzle protective sleeve having an annular internal surface of substantially constant diameter, said sleeve also having a threaded end portion engaging the threaded socket portion of the hollow coupling member, so that the sleeve can be adjusted axial- 1y as well as rotationally with respect to the coupling member, and a lock-nut threaded to such threaded end portion of the sleeve and adapted to engage the end of the socket portion of the hol- 5 low coupling member to secure the sleeve in adjusted position with respect to the coupling member.

HOMER W. JONES.

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

UNITED STATES PATENTS Number Name Date 703,940 Menne July 1, 1902 1,264,516 Hendricks Apr. 30, 1918 Number Number