B - Operations – Transporting – 28 – B
Patent
B - Operations, Transporting
28
B
72/137, 25/84
B28B 7/18 (2006.01)
Patent
CA 1052546
ABSTRACT OF THE DISCLOSURE Hole forming devices have to be engaged between forms prior to pouring Concrete. They are adapted to ex- pand when in position to engage the inner faces of the forms thus holding them in position. The jack is a tele- scopic rod or tube having a heavy expansion spring surround- ing same and normally urging the two portions of the hole forming device outwardly, but being held in the compressed or "set" position by means of a pin engaging through the two portions of the telescopic rod or tube. In one embo- diment, when the pin is pulled, the sharpened ends of the rod or tube move away from one another, pierce the end caps of the forming device and engage the faces of the forms and at the same time move the end portions of the forming de- vice outwardly into contact with the inner faces of the forms. In another embodiment, the ends of the rod or tube move outwardly and engage end pieces which in turn move out- wardly and urge cylindrical saw-tooth end caps into contact with the inner races of the walls of the form.
277847
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