B - Operations – Transporting – 25 – C
Patent
B - Operations, Transporting
25
C
1/26
B25C 1/06 (2006.01)
Patent
CA 1166401
Inventor: James D. Cunningham Title: ELECTRICALLY DRIVEN IMPACT TOOL AND METHOD OF OPERATING THE SAME ABSTRACT OF THE DISCLOSURE One or both of a pair of oppositely rotating bodies, such as motor driven flywheels, are mounted for pivotal move- ment against the side of a ram. One or more tension rods connect pivot shafts or members for equalizing precession and similar forces of the rotating bodies, rather than the housing. Pulsed solenoids produce force increased by a force multiplying device, such as pivoted links or a cable arrange- ment which has greatest mechanical advantage when the solen- oid pull is weakest at the start, but decreases as the solen- oid pull increases. The ram has an entrance taper on one or both sides. The ram is returned by a nylon sheathed bundle of elastomer cords which are looped around the ram from both sides and stretch proportionally along their length. Remov- able guide rods engage holes in the side wings of the ram. A safety device is actuated by a rod, moved through engage- ment with the work piece, for closing a safety switch in the solenoid circuit. Alternatively, a block engages a ram wing to prevent an impact stroke, but is removed by a sim- ilar rod. Alternatively, a stop block is placed between the motor housings to prevent movement of the flywheels against the ram until the work piece is engaged and a similar rod moves a spring pressed pivoted link to withdraw the stop block.
392070
Cunningham James D.
Fetherstonhaugh & Co.
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