B - Operations – Transporting – 66 – D
Patent
B - Operations, Transporting
66
D
294/22, 254/89
B66D 1/26 (2006.01)
Patent
CA 1122626
In the Canadian Patent Office Application for Patent and Offer of Disclosure for Public Dissemination Inventor: William J. Lado Owner Pettibone Corporation Title: SYSTEM FOR ONE-HANDLE CONTROL OF TWO WINCHES DURING HOISTING OF CLOSED CLAMSHELL, WITH DIFFERENTIATION ABSTRACT OF THE DISCLOSURE The invention relates to cranes or the like in which two hoist lines control a clamshell bucket. If the winch for one line is operated to draw in this line, it closes the clam- shell bucket and hoists it. During this hoisting, the winch for the other line must also be operated; to pull in the slack. If this other line is reeled in excessively, it will dump the bucket. A system is provided for automatic control of the winch being used for slack-takeup, thus avoiding the need for great care and delicate finesse by an experienced hand on a second control lever. The system puts the slack-takeup winch in hy- draulic series or tandem with the discharge from the hoisting winch, but limits the hydraulic pressure supplied to the slack- takeup winch so that it is barely enough to accomplish the take- up of its line, and cannot cause dumping.
348564
Macrae & Co.
Pettibone Corporation
LandOfFree
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