Supports – Props and braces – Adjustable length
Patent
1991-03-26
1992-11-03
Foss, J. Franklin
Supports
Props and braces
Adjustable length
254 98, 403378, A47F 500
Patent
active
051601095
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.
REFERENCES:
patent: 3520224 (1970-07-01), Hensley
patent: 3870268 (1975-03-01), Larkin
patent: 3884589 (1975-05-01), Liedholm
patent: 4221363 (1980-09-01), Jasper
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