Turning – Portable lathe for pipe turning
Patent
1998-05-18
2000-07-04
Tsai, Henry W. H.
Turning
Portable lathe for pipe turning
82128, 82142, 82149, B23B 516
Patent
active
06082235&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a pipe-end machining device (apparatus for machining pipe ends) provided with clamping means for clamping the pipe-end machining device securely on a pipe end which is to be machined.
Portable machining devices for machining the ends of tubular workpieces, such as pipes for instance, are known as preparatory step for welding or for other machining operations. These devices are employed mainly for the on-the-spot working of endless pipes or pipes which have already been laid, for example in case of repair. For this, it is necessary that the corresponding working devices be compact and easy to handle and use, but nevertheless of versatile development. Furthermore, known pipe-end machining devices having tool holders and cutting tools in order to hold the pipe-end surfaces in fixed position and machine them by means of the cutting tool. As a rule, known pipe-end machining devices have a drive unit by which the drive torque is transmitted to a driven hollow shaft via a bevel gearing transverse to the drive axis. A tool holder is firmly attached to the hollow shaft. The hollow shaft is mounted for rotation around a rod. This rod is hollow and contains a spindle which is operatively connected with clamping means. By rotation of the spindle, clamping jaws within the pipe are pressed radially against the inner wall of the pipe and the pipe-end machining device is thus positioned on the pipe. At the end of the hollow rod there is a thread an which the pipe-end machining device with the tools arranged on the tool holder is fed by a feed mechanism towards the pipe end.
Accordingly, it is an object of the present invention to improve known portable pipe-end machining devices so as to provide easier handling for the user both with regard to the operation of the device itself and upon the changing of the tool.
SUMMARY OF THE INVENTION
The foregoing object is achieved by way of the present invention wherein an apparatus for machining the ends of pipes comprises a motor, a gearing assembly and a clamping means for securely clamping a pipe end to be machined on the apparatus for machining the pipe end. The apparatus comprises a hollow rod and a tool support with a tool holder. The motor and the gearing assembly are arranged alongside of each other. All units, with the exception of the tool holder, are enclosed by a housing and thus form a compact and handy arrangement. The housing has a bottom surface which serves as standing surface and simplifies the handling of the apparatus. Preferably, the tool holder comprises a cutting plate which is designed as turnable tip member having at least two active cutting edges.
Further advantageous features of the invention can be noted from the following detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
A preferred embodiment will be explained in detail with reference to the accompanying drawings, wherein;
FIG. 1 shows a pipe-end machining device in accordance with the invention, partially in section;
FIG. 2 is a top view of a tool support of the pipe-end machining device;
FIG. 3 is a section through the tool support which the cutting tool clamped in position, seen along the line A--A;
FIG. 4 is a section through the cutting tool.
DETAILED DESCRIPTION
FIG. 1 shows a pipe-end machining device 1 in accordance with the invention. A drive unit 2 has a pneumatic or electric motor 2a with a drive shaft 3. The transmission of the torque is effected from the drive shaft 3 to a driven hollow shaft 5 by means of a gearing mechanism 4. The shaft arrangement is mounted free of clearance, which leads to an improved quality of the cutting. The hollow shaft 5 is rotatably mounted by means of a plain gearing 6 on a hollow rod 7. At one end of the hollow shaft 5 there is, at the end side, a tool support 13. Within the hollow rod 7 there is a spindle 22 which cooperates with clamping jaws 18 within a pipe 15 which is to be machined, so as to position the pipe for the machining. By turning a wheel 19, the clamping jaws 18 present
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Georg Fischer Rohrverbindungstechnik GmbH
Tsai Henry W. H.
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