Handling: hand and hoist-line implements – Grapple – Fixed and moveable jaw
Patent
1985-06-13
1987-01-20
Cherry, Johnny D.
Handling: hand and hoist-line implements
Grapple
Fixed and moveable jaw
2941101, B66C 142
Patent
active
046376453
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a device for lifting and handling objects, especially cylindrical ones, comprising a lifting arm provided with a lifting hook, which is pivotably attached to a yoke, oppositely directed clamping shoes being arranged on the lifting arm and on the yoke.
Devices for lifting different types of objects, e.g. bales, pipes, paper rolls, steel profiles, are previously known.
At such lifting devices using a clamping effect it is extremely important that said clamping effect will not start to work before the lifting device is positioned. Moreover, the clamping effect should preferably be released automatically or via remote control.
At a known device operating with clamping effect the clamping effect is released as the lifting hook is displaced laterally when the lifting device is positioned. This displacement can either take place from the driver's stand of the crane or by a direct manual actuation of the lifting hook.
If said displacement is to take place from the driver's stand of the crane a precision work is apparently concerned. If, on the other hand, manual displacement is to be used this seems to mean certain risks in respect of labour safety as the displacement of the lifting hook releases the locking mechanism of the pivoting of the lifting arm.
When lifting of an object is finished the locking mechanism is to be re-connected. One must then proceed in reversed manner to what has been described above.
It is the object of this invention to show a device of the type mentioned above, at which the release of the locking mechanism of the lifting arm takes place automatically or via remote control. Return to locking of the lifting arm at a finished lifting operation takes place quite automatically.
The object of the invention is realized in that a device of the kind mentioned above has been given the characteristic features defined in the appended claims.
An illustrative example of the invention will be described below with reference to the enclosed drawings, where
FIG. 1 is a lateral view of the device of the invention in a position to engage the object to be lifted;
FIG. 2 shows the device according to FIG. 1 in lifting position;
FIG. 3 shows a section taken on line III--III in FIG. 1;
FIG. 4 is a lateral view of an alternative embodiment of the device of the invention, the device being in a position to engage the object to be lifted;
FIG. 5 is a lateral view of the device according to FIG. 4 in lifting position and
FIG. 6 shows a section on the line VI--VI of FIG. 4.
The barrel lifting device shown in FIGS. 1 and 2 comprises an L-shaped lifting arm 1 which is pivotably connected via a joint 2 to an ear 3 of a yoke 4. The lifting arm 1 is pivotable on the level of the paper in FIGS. 1 and 2.
At the free end of the stem of the arm there is arranged a lifting eye 5. A clamping shoe 6 is disposed at the free end of the base portion of the arm.
A locking arm 7 is arranged on the lifting arm 1 somewhat above the joint 2 via a joint 8. The locking arm 7 is pivotable on a level parallel to the pivotal plane of the lifting arm 1 and provided with a locking shoulder 7a.
A release means 9 is pivotably arranged via a joint 10 on the locking arm 7. The release means 9 is pivotable perpendicularly to the plane of the paper in FIGS. 1 and 2.
On the yoke 4 a sleeve 11 is adapted in which a pin 12 is movable in its longitudinal direction. The pin 12 coacts with the release means 9 in a way as will be described in detail below.
At its end facing away from the lifting arm 1 the yoke 4 has a fixed clamping shoe 13.
A counterweight container 14 is arranged at the end of the yoke 4 facing away from the lifting arm 1. Balancing of the barrel lifting device is carried out without a barrel and with the barrel lifting device in a position according to FIG. 1. Liquid lead is thereafter filled into the container 14 until the barrel lifting device enters a balance position.
In FIG. 3 the clamping shoes 6 and 13 are shown from above.
The contours of a barrel 15 are also drawn in FIGS. 1-3.
Using the barrel lifting
REFERENCES:
patent: 1301728 (1919-04-01), Milne
patent: 2403346 (1946-07-01), Deiters
patent: 2866660 (1958-12-01), McGuire et al.
patent: 3068036 (1962-12-01), Doty
patent: 3186752 (1965-06-01), Kaplan et al.
patent: 3207548 (1965-09-01), Moskopf et al.
patent: 3273931 (1966-09-01), Caldwell et al.
patent: 3479078 (1969-11-01), Doty
patent: 4097084 (1978-06-01), Russell
patent: 4133570 (1979-01-01), Hammink et al.
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