Hack sawing machine

Details Hack sawing machine Hack sawing machine

1979-08-06

1981-03-03

Schran, Donald R.

Cutting

By tool reciprocable along elongated edge

With tool in-feed

83759, 83756, 83647, 83757, 83773, 30392, B23D 5120

Patent

active

042533651

ABSTRACT:
A hack sawing machine is disclosed, which comprises a base, a case, a shaft rotated by a motor, a saw blade bow guided in a sliding movement in the case, a drum cam which causes the blade to have an active forward stroke and a passive return stroke, a two-armed lever (bracket), eleastic means which, rotating the case, bring the blade back into the cut after the passive stroke and a hydraulic system. This system comprises a hydraulic cylinder, a hydraulic circuit having a hydraulic pump to pump oil to the cylinder. The hydraulic circuit acts to maintain a predetermined pressure of the saw blade bow on the workpiece during the active stroke and camming means cause the bow to be raised during the passive stroke.

REFERENCES:
patent: 4015500 (1977-04-01), Stolzer
patent: 4020555 (1977-05-01), Hedrick

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