Static molds – Mold including core and means to remove core
Patent
1995-01-11
1997-01-28
Woo, Jay H.
Static molds
Mold including core and means to remove core
249177, 264304, 425436R, 425468, 425DIG10, B28B 728, B29C 3376
Patent
active
055975054
ABSTRACT:
A hole form apparatus for use in forming and/or maintaining a hole or cavity in environments which would otherwise tend to close the hole, functions for example in maintaining holes cut in ice, or for making holes or cavities in other solidifying liquids or mixtures, such as concrete, or in compactable materials such as soil. The form has a tubular body that is hollow and tapered so that it is narrower at the bottom, which is closed, than at the top. Disposed within the body is a weight connected to a shaft which extends axially through the top surface of the tube to a handle attached at its end. The form is removable from a formed hole by pulling forcefully on the handle, causing the weight to strike the inside top surface of the tube in one embodiment, or a removable strike plate in a second embodiment. This impact and the shock it causes, working together with the tapered shape of the tube and its smooth surface enable the tube to be broken free from the walls of the formed hole. For ice holes, the increase in buoyancy created when the weight is lifted further enables the form to break free of the ice. The form can be made in a variety of sizes and cross-sectional shapes.
REFERENCES:
patent: 683389 (1901-09-01), Davisson
patent: 1556869 (1925-10-01), Murray
patent: 2616137 (1952-11-01), Brownstein
patent: 3940102 (1976-02-01), Bedell, Jr.
patent: 4998705 (1991-03-01), Cass
Koenig Donald H.
Koenig Myron N.
Leyson Joseph
Woo Jay H.
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