Metallurgical apparatus – Means for cutting solid metal with heat – e.g. – blowpipes – Having adjuvant material feed
Patent
1985-01-18
1986-09-09
Stallard, Wayland
Metallurgical apparatus
Means for cutting solid metal with heat, e.g., blowpipes
Having adjuvant material feed
266225, 266270, B23K 708
Patent
active
046104348
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a safety arrangement in so-called gas-cutting lances in which the lance is connected at one end thereof to a gas-supply handle or like device for the supply of gas therethrough, primarily oxygen gas, and in which the other end of the lance is progressively consumed.
Cutting lances of this kind are used, inter alia, for making holes in concrete structures and truncating heavy metal pieces, and comprise a hollow tubular casing, normally made of iron or non-alloyed steel, which often has arranged therein a core of tightly packed, axially extending steel wires. Embodiments are known in which this core comprises a powderous mixture.
One problem with such cutting lances is that the whole of a lance can be consumed, resulting in injury to the workman and the handle or like device, and in the release of gas to the surroundings, which in many cases may have serious consequences. An object of the invention is therefore to provide a safety arrangement, so as to eliminate this problem.
Thus, the present invention relates to a safety arrangement in so-called gas-cutting lances of the kind in which the lance is connected at one end thereof, the attachment end, to a gas-supply handle or like device by which gas, primarily oxygen gas, can be caused to pass through the lance; in which the lance comprises a hollow tube having arranged therein a core preferably comprising e.g. tightly packed filaments; and in which the tube and the core have a high iron content and are intended to progressively melt away at the free end of the lance, and to be at least partially combusted, oxidized.
The invention is particularly characterized in that preferably at least said lance includes at least one substantially tubular sleeve or like member arranged adjacent the attachment end of the lance; in that this attachment end is void of core material; and in that said at least one sleeve is intended and arranged to prevent or terminate melting and combustion of the lance and core material, such that the lance is extinguished when melting and combustion of the lance has reached said at least one sleeve.
The invention will now be described in more detail with reference to an embodiment thereof illustrated in the accompanying drawing, in which
FIG. 1 is a schematic longitudinal sectional view of part of a lance designed in accordance with the invention;
FIG. 2 is a sectional view taken on the line A--A in FIG. 1; and
FIG. 3 illustrates a handle for a lance according to the invention.
FIG. 1 illustrates a so-called gas-cutting lance 1, which is arranged to be attached at one end 2 thereof, its attachment end, to a handle 3, shown in phantom lines in FIG. 1, by means of which gas, primarily oxygen gas, can be caused to flow through the lance 1, as indicated by the arrow 4 in FIG. 1. The lance comprises a hollow tube or pipe 5, preferably having a core 6 of e.g. closely packed wire filaments 7 arranged therein. The tube 1 and the core are preferably made of low-carbon, substantially non-alloyed steel, i.e. a material of high iron content, and are intended to melt away progressively at the free end of the lance, not shown, and to be at least partially combusted, oxidized.
In accordance with the invention, at least the lance 1 includes at least one substantially tubular sleeve or like member. The embodiment illustrated in FIGS. 1 and 2 includes two such sleeves, an internal sleeve 8 and an external sleeve 9. The sleeves 8, 9 are located adjacent the lance-attachment end 2. At the lance-attachment end 2 the lance has extending from said end a region 10 which is void of core material, this region extending over a suitable distance, such as from 1-2 decimeters for example. The sleeves 8, 9 are suitably placed at the coreless region 10 of the lance 1, contiguous with the core-filled region 11 thereof, and overlap each other in the manner shown in FIG. 1. The sleeves 8, 9 are suitably of noticeable length, for example in the order of some few centimeters and are also of noticeable thickness.
Each sleeve 8, 9 is preferably ma
REFERENCES:
patent: 1793849 (1931-02-01), Groninger
patent: 1844194 (1932-02-01), Von Maltitz
patent: 2210640 (1940-08-01), Swafford
patent: 4239194 (1980-12-01), Debaise
Stallard Wayland
Svensk Termo-Ekonomi AB
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