Pipe feeding mechanism of an automatic pipe bender

Metal deforming – By deflecting successively-presented portions of work during... – By use of work-contacting wiper and moving – work-holding form

Reexamination Certificate

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Details

C072S307000, C072S420000

Reexamination Certificate

active

07028521

ABSTRACT:
A pipe feeding mechanism includes a rack, a power source, first and second planetary gears, a clutch for releaseably securing an output shaft to an input shaft in the first planetary gear, and a brake for releaseably blocking rotation of a sun gear of the first planetary gear; the input shaft of the first planetary gear is connected to the power source; the first planetary gear will be stopped from functioning, and the output shaft thereof rotated at a same speed as the input shaft thereof during a return stroke of pipe feeding cycle after the clutch is switched to a clutching position, and the brake device a releasing position; the first planetary gear will be allowed to function together with the second planetary gear to increase output torque during a forward stroke after the clutch is switched to a releasing position, and the brake device a braking position.

REFERENCES:
patent: 2251625 (1941-08-01), Hale
patent: 4765168 (1988-08-01), Stange et al.
patent: 5343725 (1994-09-01), Sabine
patent: 5685796 (1997-11-01), Chen et al.
patent: 6605019 (2003-08-01), Eckert

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