Handling: hand and hoist-line implements – Hook – hoistline – or grab type – Load releasing means
Patent
1993-02-10
1994-03-08
Mitchell, David M.
Handling: hand and hoist-line implements
Hook, hoistline, or grab type
Load releasing means
294 822, B66C 136
Patent
active
052921654
ABSTRACT:
A lifting hook comprising a suspension part (1) fitted with a suspension shaft (7) which supports a hook part (5) provided with a slot (6). A safety latch (11) is pivotally journalled in the hook part. In a raised position, the safety latch keeps the suspension shaft distanced from an upper end portion (32) of the slot by engaging contact surfaces (16, 17) of the suspension part. When the safety latch is swung down, the suspension shaft moves into said end portion, whereby the safety latch is locked. The hook part (5) can be arranged, when being lowered into contact with the load or another surface and thereupon lifted again, to perform a turning movement into an upside down position during which the safety latch is opened and the load is released. The turning movement is caused by a displacement of the suspension shaft (7) and the hook part (5) in relation to each other along the slot (6), which results in a displacement of the center of gravity of the hook part.
REFERENCES:
patent: 2864644 (1958-12-01), Marryatt
patent: 3173718 (1965-03-01), Harley
patent: 4610474 (1986-09-01), Jaatinen
patent: 4765667 (1988-08-01), Hamrin
Kramer Dean J.
Mitchell David M.
Stone Mark P.
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