| 摘要 |
A gang mower typically having five or seven gangs which are raised and lowered by a single piston and cylinder. Lifting arms are fixed to an actuating shaft at each side of the machine and the piston and cylinder are connected between opposed lifting arms to rotate them in opposite directions. An equalizer link connected by cranks to the actuating shafts ensures that the shafts always rotate to equal extents in opposite directions. Chains are connected from the lifting arms to the mowers, the chains and lifting arms being dimensioned so that lifting occurs sequentially, with some of the mowers being lifted before others. The sequential lifting spreads the load more evenly throughout the lifting sequence, thereby permitting a single piston and cylinder to lift all of the mowers.
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