US 5,160,109 AGranted

Steel post shore, or prop, for supporting of formwork in constructing buildings

OwnerPetrus J. L. de Leeuwinventor

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Abstract

For supporting of formwork in constructing buildings, use is made of steel post shores (props) having a pin with recessed areas thereon. When the prop has to be brought from the loaded to the unloaded position, such pin is changed of position in the prop so as to allow the inner tube to be lowered within the outer tube of the prop. The invention provides a new pin-design such that after assembling the prop it can be clearly seen whether the pin finds itself in the correct position or not. For that purpose, use is made of a pin having a recess and a flattened portion; by axial displacement of the pin this portion rests on a ring or on an inner tube under changing its angular position, which is well visible for the user. Alternatively a cylindrical pin may have two cams resting on a ring; by axially displacing this pin it will rotate over 90.degree. and the inner tube will be lowered in the outer tube, which position is clearly visible for the user.

Claims5

Dependent claims

Steel post shore, or prop, for supporting of formwork, deckings or the like in constructing buildings, which has two telescopically movable tubes (1, 3), in which the outer tube (1)--at the end of which the inner tube (3) is inserted--is provided with a threaded portion and in which holes (17) are arranged in a longitudinal row along the inner tube, in which a pin (15) in a direction, transverse to the longitudinal direction of the tube can be passed and can be moved therein in its longitudinal direction, which pin (15) can be supported on a socket or ring (12) being screwed onto the outer side of the outer tube, the pin at its circumference, being provided with recesses such that at its displacement in a longitudinal direction the supported inner tube can be inserted a greater distance into the outer tube, characterised, in that after the displacement of the pin (15, 37) from the fully loaded position of the prop to a nearly unloaded position of said prop, this pin (15, 37) takes up a position, in which in relation to the horizontal it is arranged obliquely, or a position in which it is fallen over around its longitudinal axis.

Dependencies are inferred from the claim text.