Handling: hand and hoist-line implements – Hoist-line slings – Latch release
Patent
1985-11-01
1987-01-20
Marbert, James B.
Handling: hand and hoist-line implements
Hoist-line slings
Latch release
294 8211, 294 8214, 2941101, 294116, B66C 138, F16F 1506
Patent
active
046376437
ABSTRACT:
A self-releasing coupling includes a casing body (14) to which is attached a cap portion (16) and in which a grasping mechanism (50) is movably positioned. The grasping mechanism includes grapple arms (80) rockably mounted on a piston (52) and held thereon by a snap ring (112). Springs (120, 124) bias the piston forward and aft of the casing body and a cap shoulder (28) and keys (42) move the snap ring forward and aft of grapple arm fulcrums (86) to bias the grapple arms into an element grasping or into an element releasing/receiving configuration. Each grapple arm includes a ramp (142) which engages a chamfer (150) on a casing seating shoulder (40) to increase the grasping force on an element as the pull or tension on that element increases. The snap ring is moved into a grapple arm opening position while the grapple arm is grasping the element and aprons (144) on the grapple arms engage a surface (150) on the casing to maintain the grapple arms in grasping engagement with the element to counter the bias of the snap ring in this mode to the device.
REFERENCES:
patent: 2476734 (1949-07-01), Jellison
patent: 2823379 (1958-02-01), Novak
patent: 3081122 (1963-03-01), Jungersen
patent: 3104906 (1960-08-01), Adams
patent: 3116663 (1964-01-01), Musgrave
patent: 3260546 (1966-07-01), Stack
patent: 4258888 (1981-03-01), Sawn
patent: 4293155 (1981-10-01), Grant
patent: 4358144 (1982-11-01), Schmidt et al.
Biller Cleveland J.
Johnson David D.
Marbert James B.
McConnell David G.
Silverstein M. Howard
The United States of America as represented by the Secretary of
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