Metallurgical apparatus – Means for cutting solid metal with heat – e.g. – blowpipes – With means for cutting tubular workpiece
Patent
1986-08-13
1988-01-05
Andrews, Melvyn J.
Metallurgical apparatus
Means for cutting solid metal with heat, e.g., blowpipes
With means for cutting tubular workpiece
266 72, 266 48, B23K 702
Patent
active
047171243
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a steering mechanism for an autogenous cutting torch, comprising a base, a steering arm in the form of a long shaft, whose one end is fitted with an autogenous cutting torch, said steering arm being journalled to be axially movable relative to the base and rotatable around its axis, and control and drive means for said steering arm both for moving the steering arm axially and for rotating it around its axis, the drive means for achieving the axial movement of said steering arm being fastened to an element rotating along with the steering arm which is axially movable through said element, said integrally rotating element being a transmission means between a drive means for producing the steering arm rotating motion and the actual steering arm.
This type of mechanism is disclosed in Patent publication SE-422 169. In this prior known mechanism, the control of a steering arm's axial movement is based on monitoring the surface of a workpiece by means of a sensor while the rotation of a steering arm is effected at some predetermined, e.g. constant speed. Thus, the axial movement of a steering arm follows in a forced manner the surface configuration of a workpiece in the travelling path of a cutting torch as said torch is advancing as a result of the steering arm's rotation. This prior known mechanism is only capable of working surfaces which have a projection in the plane perpendicular to the axial direction of a steering arm. Working of a cylindrical surface or a pipe from inside is not possible at all. The cutting pattern will be limited to a pattern formed by a cutting line between a cylindrical surface concentric with the steering arm and a workpiece surface being machined. In other words, the mechanism can be used for cutting not only circular holes but also elliptical holes by placing a cylindrical body to be machined in an inclined position relative to the axial direction of a steering arm. Despite the complicated design of such a mechanism, its plausible applications are quite limited.
The Applicant's U.S. Pat. No. 4,455,015 discloses an apparatus for cutting circular or elliptical holes in cylinders and pipes from the inside. In this prior known apparatus, the dependence between the rotary movement and axial movement of a steering arm is obtained by means of a link mechanism and thus a cutting pattern can only be changed by changing the leverages. Also, adaptation of the apparatus to the working of surfaces of various shapes requires accurate and tedious setting work. A particular restriction is that the apparatus cannot be used for cutting a pipe.
An object of the invention is to develop the above-mentioned apparatus further so that its adaptability and scope of application will be substantially more extensive than heretofore while, at the same time, a desired cutting pattern can be readily selected by means of digital control. A further object of the invention is to improve said apparatus in a manner that its adaptation to the working of surfaces and workpieces of various shapes, combined with a possibility of selecting a desired cutting pattern, can be done by way of programming without re-arranging mechanical components.
These objects will be achieved on the basis of inventive features set forth in the annexed claims
One embodiment of the invention will now be described in more detail with reference made to the accompanying drawings, in which
FIG. 1 is a perspective view of a steering mechanism of the invention and
FIG. 2 shows the steering arm of such mechanism in cross-section.
FIG. 3 shows an essential detail of the mechanism to a larger scale, the portion above the centre axis showing an axial section.
Supported on base runners 1 is a base section 1a, which is movable on wheels 6 and carries a base section 1b. Base section 1b provides a bed for other control equipment and is mounted on base section 1a by means of so-called vertical adjustment screws 7. A cable, chain or similar drive 8 can be used to rotate screws 7 for adjusting the height of bed 1b. Said bed 1b
REFERENCES:
patent: 2202131 (1940-05-01), Wagner
patent: 4330110 (1982-05-01), Creech
patent: 4372538 (1983-02-01), Balfanz
patent: 4411410 (1983-10-01), Sumner
patent: 4455015 (1984-06-01), Larikka
Andrews Melvyn J.
Kastler S.
LandOfFree
Steering mechanism for autogenous cutting torch does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Steering mechanism for autogenous cutting torch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Steering mechanism for autogenous cutting torch will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4305