Turning – Severing or cut-off – Infeed means
Patent
1989-11-15
1991-07-02
Watts, Douglas D.
Turning
Severing or cut-off
Infeed means
82 83, 30 94, 409166, 409199, B23D 2104
Patent
active
050276816
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a cutting and machining device for cylindrical bodies, especially tubes.
Prior art cutting and machining devices are described, e.g. in the Swedish Patent 214 701, in the Swedish Published Specification 421 881, in the German Auslegeschrift 1 627 160 and in the U.S. Pat. No. 3,302,285. The devices according to the Swedish publications mentioned are big and heavy and they are not intended to be moved or carried by hand. The device according to the German Auslegeschrift 1 627 160 again is not actually intended to be used for cutting tubes, but especially for cutting metallic cylinder linings and piston rings of combustion engines. The device according to the U.S. Pat. No. 3,302,285 is portable and small and it is primarily intended for cutting copper tubes with small diameters. This device does not show proper tube rotating elements, which makes the cutting difficult and slow. Additionally, the tube to be cut is insufficiently supported, which makes it necessary to press the upper part of the device all the time against the tube by hand.
The object of the present invention is to provide a new portable device especially intended for cutting and machining tubes, which avoids the problems described above. The device is easy to use. Its cutting or machining takes place quickly and accurately. This object is achieved in that the rotating elements that rotate the cylindrical body are the upper supporting rolls, transmission gears are fastened to the upper supporting rolls, a transmission wheel is arranged in the upper part of the upper frame with an operating handle, and as a flexible transmission element circulates around the gears and the wheel.
In this way, a reliable and cheap manually operated tube rotating mechanism is provided for cutting or machining a tube, whereby the tube is safely supported as well. The weight of the device can be made small and when the operating handle of the rotating mechanism with its transmission gears is arranged high enough in the upper frame, it is not necessary to work in a bent position. The device is especially suitable for cutting plastic tubes. Earlier, e.g. plastic drain pipes were cut with a hack saw or the like, since no suitable tool existed, which resulted in oblique and easily cleaving tube ends causing sealing problems. Electric tools for domestic use, e.g. an angle grinding machine, can be used as cutting and machining means.
The transmission gears and an intermediate gear are preferably toothed or chain gears, the transmission wheel is a toothed or chain wheel and the flexible transmission element is a cogged belt or chain.
It is especially preferable that the transfer elements to move the upper frame downwards are formed of the rotating elements and of a locking element arranged in the lower frame, which locking element locks the flexible transmission element to the lower frame, when the handle is rotated in the direction intended for moving the upper frame downwards, which direction is opposite to the direction in which the cylindrical body is intended to be rotated, thus causing the upper frame to move downwards, which locking element can be released by means of a release element. In this structure, the tube rotating mechanism is also used for lowering the upper frame and at the same time for pressing the driving upper supporting rolls with a suitable tightness on the tube. This simplifies the structure considerably and also enables a quick and easy lowering of the upper frame. A rotation of the tube can be started only by changing the rotating direction of the operating handle without loosening the grip on the operating handle.
Moreover, it is preferable that inside the vertical part of the upper frame is arranged a gas piston leaning on the lower frame in order to lift the upper frame upwards when the upper frame is released from locking.
In the following, the invention is explained in more detail by means of a preferable embodiment with reference to the enclosed drawings, in which
FIG. 1 shows a perspective view of a device of the in
REFERENCES:
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patent: 1992812 (1935-02-01), Chapman
patent: 3292468 (1966-12-01), Orthey
patent: 3302285 (1967-02-01), Mann, Jr.
patent: 3520218 (1970-07-01), Tolkmitt
patent: 3541905 (1970-11-01), Mey
patent: 3572199 (1971-03-01), Harden
patent: 4412401 (1983-11-01), Fundell
patent: 4693149 (1987-09-01), Sireix
Husar John M.
Watts Douglas D.
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