| 摘要 |
PCT No. PCT/GB90/01185 Sec. 371 Date May 13, 1992 Sec. 102(e) Date May 13, 1992 PCT Filed Jul. 31, 1990 PCT Pub. No. WO91/03927 PCT Pub. Date Apr. 4, 1991.A grass cutting unit has a height of cut determined by a ground roll. A reaction member linked to the ground roll has a captive screw-threaded shaft carrying a hand wheel. A block threaded onto the shaft is linked to the frame of the cutting unit so that rotation of the hand wheel adjusts the height of cut. The weight of the frame is arranged to act on the hand wheel, to urge together contoured surfaces of the hand wheel and the reaction member so as, during normal cutting, to prevent spurious rotation of the hand wheel.
|
