IMPROVEMENTS IN DRIVE MECHANISMS

摘要

A mechanism (10) for opening and closing gates comprises a motor (15) (Figure 2) which drives a worm gear (19) engaged with a worm wheel (30) for driving an output shaft (32) connected to a gate in use. The mechanism includes a clutch arrangement in which a pressure plate (40) is urged by springs (44) against the worm wheel (30) and an abutment on a hub (31). The clutch mechanism is enclosed in a housing (14) filled with lubricating oil and slipping of the clutch allows manual override of the drive mechanism. <IMAGE>