Mechanically releasable shackle pin

Details Mechanically releasable shackle pin Mechanically releasable shackle pin

2008-08-26

2009-11-10

Jones, David B (Department: 3725)

Chain, staple, and horseshoe making

Chains

Links

C403S324000, C294S082100, C294S082350

Reexamination Certificate

active

07614209

ABSTRACT:
A mechanically releasable shackle pin arrangement that is readily operated by an ROV and is not affected by the hydrostatic pressures encountered at depth. A shackle body having two ends has a shackle pin received through bores at one end of the shackle body. A shackle nut threaded on the shackle pin secures the shackle pin in an installed position through the bores in the shackle body. An anti-rotation link plate is attached to the shackle body. The anti-rotation link plate extends to one end of the side plate. The shackle pin extends through bores at one end of the shackle body and the anti-rotation link plate and is secured in its installed position by a shackle nut threaded on the shackle pin. Means for preventing rotation of the shackle nut and loss of the shackle nut is provided on the anti-rotation link plate such that the shackle pin can be removed by a remotely operated tool on an ROV at depth to release a load without the need for hydraulics on the shackle assembly. The shackle pin is provided with a special plate arrangement designed to allow the shackle pin to be gripped and rotated by a remotely operated tool on an ROV.

REFERENCES:
patent: 620914 (1899-03-01), Griffith
patent: 962733 (1910-06-01), Beltz
patent: 2097465 (1937-11-01), Morrison
patent: 2435336 (1948-02-01), Belvel
patent: 4221252 (1980-09-01), Bruce
patent: 4307567 (1981-12-01), Archer
patent: 5046881 (1991-09-01), Swager
patent: 7393033 (2008-07-01), Bisso, IV
patent: 7540140 (2009-06-01), Diaz et al.

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