Showing papers on "Portal frame published in 1976"

Portal frame for trench box stack

Abstract: A portal frame attached to the open end of a trench box structure and assembling and rigidifying the stacked plural boxes forming the smooth wall sides of the consequent trench box whereby side sections or panels of trench boxes are stackably adjustable as to depth or trench served and the portal span provides maximum clearance for the pipe.

Pile extractor with suspended vibrator frame - has spring loaded anvils in frame for varying extraction force

Abstract: The machine is for excavating and extraction from the ground of support elements used to make pile reinforced foundations. It hasa portal frame for supporting a vertically moving frame and a vibrator. The vibrator is mounted on the frame with elastic supports and is connected to the components to be extracted. This machine can be used for extracting large piles from the ground. The vibrator frame (5) is connected by flexible springs (9) to the out- of-balance vibration exciter (10). The frame has a number of spring-loaded anvils (11) for transmitting vibrations to the frame. These anvils are arranged at different levels for varying the impact force transmitted to the frame through anvil springs.

Lightweight air freight container - has charging opening reinforced by portal frame from glass fibre embedded in synthetic resin

Abstract: Air freight container includes a charging opening reinforced by a portal frame. The portal frame consists of glass fibres (2) embedded in a synthetic resin (3). The glass fibres (2) embedded in the resin (3) are positioned seamless round the container opening. The frame may be fastened to a base plate made of aluminium. Optimum strength with minimum weight in achieved.