mechanically extendible arm to be applied on tractors and other vehicles act to support heads operators for agricultural work or similar

摘要

PCT No. PCT/AU84/00047 Sec. 371 Date Nov. 20, 1984 Sec. 102(e) Date Nov. 20, 1984 PCT Filed Mar. 20, 1984 PCT Pub. No. WO84/03603 PCT Pub. Date Sep. 27, 1984.An extendible boom utilizing a rack and pinion mechanism to enable reciprocating movement of a work head such as a spray for agricultural application beneath orchard trees, the boom comprising a hollow section having a substantially rectangular cross-section containing a slot along the lower wall, running on internally disposed supporting rollers, having a rack extended therealong, mated with a driven pinion wheel to enable boom movement.