Ships – Sail or control means therefor – Fastening device for sail
Patent
1998-02-23
1999-05-18
Avila, Stephen
Ships
Sail or control means therefor
Fastening device for sail
24602, B63H9/04
Patent
active
059041129
ABSTRACT:
An improved shackle apparatus that introduces improvements to the basic shackle design to allow for easy attachment to the corner of a flexible membrane such as a sail. The releasable shackle comprises of a body, hook, internal trigger, and mounting lugs. The mounting lugs are located on the shackle body such that the shackle can be attached to the corner of a sail using standard webbing and eliminates the need to install an additional grommet or ring onto the sail. The lugs are oriented such as to position the pivot point of the shackle hook at the projected comer of the sail, or alternatively slightly below the bottom edge of the sail to prevent the foot of the sail from dragging over the deck when connected to a standard deck fitting. The lugs are also arranged in such a manner as to position the pivot point of the shackle hook direct in line with the force vector created by loads on the sail so as to reduce the twisting moment on the shackle body and loadings on the hook and prevent the formation of wrinkles and creases across the sail fabric.
REFERENCES:
patent: 2764792 (1956-10-01), Mansfield
patent: 3850468 (1974-11-01), Hultin
patent: 4590882 (1986-05-01), Murphy
patent: 5195223 (1993-03-01), Tylaska
patent: 5634246 (1997-06-01), Jermyn, Jr.
Kline Gregory R.
Moore Gregory C.
Tylaska Timothy T.
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