Bizarre Patents
A method of swing on a swing is disclosed, in which a user positioned on a standard swing suspended by two chains from a substantially horizontal tree branch induces side to side motion by pulling alternately on one chain and then the other.
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| Number | Title | Issue Date |
| 5361469 | Apparatus for helical cutting of a flexible tubular sheet of polymeric material In an apparatus for cutting a tubular film into an elongated strip wherein the tubular film is fed at a given velocity in flattened form from a supply reel to an expansion zone where the film is expanded into a tube, advanced after such expansion along a ... | 11/08/1994 |
| 4809413 | Apparatus for helically slitting a continuous tubular film of synthetic thermoplastic material In an apparatus for helically slitting a continuous tubular film of synthetic thermoplastic material, a pair of feed rollers for feeding flattened continuous tubular film to a mandrel are mounted at fixed locations in a main frame. A rotary support mounte... | 03/07/1989 |
