| 摘要 |
A torsion spring counterbalance for a lawn mower pivotally supported on a tractor for raising and lowering the lawn mower, and for permitting the mower to pivot about its longitudinal axis to adjust to the elevation of the ground. The mower is mounted on the tractor with two mating pieces, and a torsion spring has its opposite ends connected to respective ones of the two pieces for counterbalancing any overweight on one end of the mower, such as a hydraulic motor on the mower. A clamp is adjustably engaged with one end of the torsion spring for adjusting the torsional force in the spring and thereby adjusting the counterbalancing force exertable by the spring on the mower. |
