Abstract: A sliding cantilevered gates gate panel is carried by posts for sliding movement in the plane of the gate opening with each post having inner and outer parallel post members separated by a central opening within which the gate panel is mounted. The gate panel has a longitudinally extending track member, a plurality of upstanding posts connected to and upstanding from the track member and a top rail connected across top ends of the posts forming together a generally rectangular panel. Each post has support rollers for running along the track and a drive assembly at a post drives a sprocket engaging a chain mounted inside the track member.

Abstract: An elevation apparatus for lifting a truck box pivotally mounted on the truck chassis comprises a first main cylinder piston arrangement arranged at the front end of the truck box and a second subsidiary piston/cylinder arrangement provided adjacent the midpoint of the truck box. The secondary piston/cylinder arrangement includes two cylinders, one on either side of the chassis and arranged in the lowered position to lie substantially along the chassis with the piston directly coupled to the truck box and the cylinder coupled directly to the chassis. A latch mechanism for the piston of the main cylinder acts to lock the piston head in position on the chassis when the truck box is lowered and to release the piston head when the truck box is raised so that the piston head moves free from the latch mechanism when the secondary cylinders raise the truck box beyond the extent of the first piston.