US Patent: 4,173,069
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| Power shear head
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Patentees:
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| Harry L. Sidenstick (exact or similar names) - Cincinnati, OH |
| Henry R. Hoffman (exact or similar names) - Cincinnati, OH |
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Patent Dates:
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| Applied: |
May 24, 1978 |
| Granted: |
Nov. 06, 1979 |
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Jeff Joslin
Vintage Machinery entry for Kett Tool Co.
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Description: |
| Improvements to shears of the type shown in patent 2,934,822, to better adapt them for cutting heavier gauge material, such as 14 gauge mild steel or 16 gauge stainless steel. One issue is to avoid a tightly coiled curl, which requires excessive power to produce. Another is that the "load imposed upon the cam ring employed to oscillate the movable shear blade caused that cam ring to be pulled off the eccentric bushing upon which it was mounted." The improvements include "the provision of diverging arms formed on the rear edge of the movable blade for engagement with the cam ring. Secondly, the pivot point of the movable shear blade is shifted to the opposite side of the motor drive axis, i.e., the side remote from the cutting edge of the blade. Finally, contact is established between the arms of the movable blade and the circular ram ring on portions of the ring disposed toward the cutting edges from the transverse center line of the ring." This combination of elements was determined to produced a curl of cut metal that was sufficiently curled to clear both the shear and the workpiece, but not too small as to waste power in its formation. As well, the cam ring is no longer susceptible to damage in ordinary use. |
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