| US 7,497,492 B2 | ||
| Hydraulic auxiliary hoist and crane control for high precision load positioning | ||
| Jesus Gonzalez, Madrid (Spain); and Luis Sordo, Madrid (Spain) | ||
| Assigned to Actuant Corporation, Glendale, Wis. (US) | ||
| Appl. No. 10/594,139 PCT Filed Mar. 28, 2005, PCT No. PCT/US2005/010302 § 371(c)(1), (2), (4) Date Jun. 08, 2007, PCT Pub. No. WO2005/094296, PCT Pub. Date Oct. 13, 2005. |
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| Claims priority of provisional application 60/556577, filed on Mar. 26, 2004. | ||
| Prior Publication US 2007/0284327 A1, Dec. 13, 2007 | ||
| Int. Cl. B66C 13/04 (2006.01) | ||
| U.S. Cl. 294—67.5 [294/82.12; 212/274] | 18 Claims |
| 1. A hoist for positioning a load, comprising:
a plurality of hydraulic hoist cylinders each coupled at one end to the hoist and at an opposite end to the load at a lifting
point;
a plurality of position sensors, each associated with one of the hoist cylinders and operable to provide position data for
the associated hoist cylinder;
a plurality of electronically controlled valves hydraulically coupled to the hoist cylinders for extending and retracting
the associated hoist cylinders;
a user input device operable by a user to specify load data; and
a hoist controller operable to receive the load data from the input device and the position data from the position sensors
and in response thereto to control the electronically controlled valves so as to position the load according to the load data.
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