Metallurgical apparatus – Means for cutting solid metal with heat – e.g. – blowpipes – Circle cutter
Patent
1985-06-26
1986-11-11
Stallard, Wayland
Metallurgical apparatus
Means for cutting solid metal with heat, e.g., blowpipes
Circle cutter
B23K 710
Patent
active
046217924
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an attachment for a cutting tool which when fitted to gas-operated apparatus such as oxy-acetylene torches is primarily useful in cutting discs or circular plates of metal from a metal sheet.
Hitherto conventional welding tools or attachments for the abovementioned purpose included an attachment which comprised a support cradle which was attachable to the cutting head of the cutting torch by screw members wnhich attachment included a roller wheel on one side of the support cradle and a laterally extending rod on the other side of the support cradle to which was releasably attached a compass point. The operator would then grasp the cutting torch rearwardly of the support cradle and then cut a circle in a metal sheet supporting the assembly of cutting torch and attachment by manipulating the assembly so that the cutter transcribed a circle with the assistance of the roller wheel and using the compass point as a guide or fulcrum.
In another conventional arrangement which was similar to that described above the support cradle was in the form of a retaining collar which contained a bearing for rotatably supporting the cutting head.
In relation to the prior art it has now been found that in each case the guide wheel was fixed or rigidly mounted to the support cradle and thus when it was desired to place the cutting head at the extreme peripheral edge of the metal sheet this was normally not possible to do because the guide wheel formed an obstruction. Because of this problem wastage occurred in relation to effective utilization of the metal sheet especially when attempting to obtain the maximum number of metal discs or circles from the same metal plate.
Also it was found that it was usually not possible to cut discs or circles of relatively small diameter and thus normally the discs had a minimum diameter of 80 mm.
It was also found that in some cases the prior art cutting tool attachments as described above were relatively unstable in operation and required a very sure hand to manipulate when cutting the metal plate which was usually formed from steel and in these circumstances the quality of workmanship could suffer as well as efficiency of operation.
An object of the invention is therefore to provide a cutting tool attachment which when fitted to a cutting tool or cutting torch enables discs or circular plates of metal to be cut from a metal sheet in a manner which alleviates the abovementioned difficulties associated with the prior art.
The invention therefore in one aspect provides an attachment for a cutting torch including:
a support member for supporting a cutting head of the cutting torch;
guide means for guiding the cutting head at a suitable height for operation;
pivot means for use as a fulcrum or central support; and
common mounting means for releasably mounting each of said support member, said guide means and said pivot means, the construction and arrangement being such that in use said cutting head may cut a circular plate of metal from a metal sheet when supported by said support member and guided by said guide means using said pivot means as a central support or fulcrum whereby each of said support member, said guide means and said pivot means is interchangeable.
The common mounting means in one form may comprise an elongate rod or rail to which suitably all of the pivot means, support member and guide wheel are releasably mounted. More preferably however the common mounting means includes a mounting frame including a pair of opposed guide rods or rails to which all of the pivot means, support member and guide wheel are releasably mounted.
Thus in one form the pivot means which suitably in the form of a pivot rod having a compass point wherein the pivot rod has an offset shank which is preferably bent inwardly toward the cutting head in use and is attachable to a first mounting block having a central vertically oriented passageway for retention of the top end of the pivot pin and also substantially parallel and horizontal or longitudinal passageways for retention of sa
REFERENCES:
patent: 3139471 (1964-06-01), Root
patent: 3174736 (1965-03-01), Cameron
patent: 3514087 (1970-05-01), Richards
patent: 4173333 (1979-11-01), Wise
patent: 4283043 (1981-08-01), Kalian
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