Hack sawing machine
OwnerMario Ragazziniinventor
Life of this patent
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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.
Claims4
A hack sawing machine characterized in that it comprises a base, a vice for clamping a workpiece being mounted to said base, a case hinged to said base, a shaft carried rotatably inside said case and rotatively driven by a motor mounted to said case, a blade carrying bow slidably guided in said case in a direction parallel to said shaft, a drum cam rotatively rigid with said shaft for reciprocating said blade carrying bow back and forth through an active forward stroke and a passive return stroke, a two-arm lever journalled in said case along an axis perpendicular to said shaft, elastic means interposed between one arm of said lever and said case, a hydraulic cylinder articulated with one end to said base and with the other end to the arm of said lever opposing said one arm whereon said elastic means are active, a hydraulic circuit supplying said cylinder such as to maintain said blade carrying bow on the workpiece with a predetermined pressure during the active stroke, and camming means mounted to said shaft and acting on said lever to cause said case to be rotated and said blade carrying bow to be raised during the passive stroke.
Dependencies are inferred from the claim text.