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US 3,939,234 AGranted
Method for sealing and stripping a concrete form
AssigneeInterform, Inc.
InventorStephen S. Dashew
Life of this patent
Estimating the term…
Abstract
A device for sealing the air hole in a concrete form while concrete is poured over the form, including a cap of resilient material having a dome-like top and a cruciform shaft extending from the concave side of the top for reception in the air hole of the form. When the dome is pressed down to form a dimple therein, the fact that the dimple remains indicates that the shaft is firmly seated in the air hole.
Claims1
A method for sealing and stripping a form of a type which has an air hole extending through a wall of the form comprising:
- inserting through the air hole in an interference fit with the walls thereof, the shaft of a cap which has a thin dome with a concave inner surface at one end of the shaft, and depressing the center of the dome towards the form wall to deform the dome so it has a central dimple;
- pouring concrete over the form and allowing it to at least partially set;
- and
- applying a gas conduit to said air hole at the inside of the form and blowing gas under pressure therethrough to provide a layer of pressured gas between the concrete and form wall to loosen the form.
1 more element
Dependencies are inferred from the claim text.