Rectangular frame for swinging window or door has outer frame members with screws holding inner frame members and screw bolts at bottom actuated by bevel gear drive

摘要

The screw bolt system is installed at the bottom corners of the frame to align the frame members a threaded spindle (11) engages in a threaded though-bore in the bottom frame member (9). It has an enlarged foot (24) which rests on the floor. The spindle is accommodated in a cavity (12) at the bottom of one of the vertical frame members (6). The drive mechanism (18) for turning the spindle has a sleeve (21) engaging an axle (20). A bevel gear at the top of the shaft is driven by an inclined bevel gear (16) with socket for an Allan key or a screwdriver.