Handling: hand and hoist-line implements – Hook – hoistline – or grab type – Load releasing means
Patent
1992-05-29
1993-12-07
Mitchell, David M.
Handling: hand and hoist-line implements
Hook, hoistline, or grab type
Load releasing means
294 8234, B66C 136
Patent
active
052677656
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a load carrying apparatus, including a casing and a load hook pivotably mounted to the casing, a connection portion adapted for connection to a load rope, a stop pawl adapted to cooperate with the load hook at its mouth area, a device for a remote controlled pivoting of the load hook and thus opening of the mouth area of the load hook to release a load from the load hook.
2. Description of the Prior Art
Load carrying apparatuses of the kind set forth above are generally available specifically for use at helicopters. In the case of helicopters it is quite important that the load, if necessary, can be dropped from the load hook. The commonly known stop pawl located in the mouth area of the load hook is generally spring loaded and operates properly if the flight poses no problems. If, however, the helicopter suddenly stalls together with the load, it is possible that the load rope slackens and dislocates the stop pawl which is biassed by means of a spring in its locking position from the outside and thus leading to an opening of the mouth area of the load hook, such that a critical and dangerous situation can arise.
SUMMARY OF THE INVENTION
It is a general object of the present invention to provide a load carrying apparatus, by means of which mentioned dangerous situation cannot arise.
A further object is to provide a load carrying apparatus which comprises a locking bar supported to reciprocate inside of the casing of the apparatus between a locking position and a release position, which locking bar in its locking position is located in the path of the movement of the stop pawl into a load hook mouth area opening position, whereby an opening of the load hook mouth area is prevented.
A further object is to provide a load carrying apparatus having a stop pawl which is kept by means of a locking bar in a form closed manner in its locking position.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be better understood and objects other than those set forth above will become apparent when consideration is given to the following detailed description thereof. Such description makes reference to the annexed drawings, wherein:
FIG. 1 is a side view of the lower part of the load carrying apparatus designed partly in section, without the load rope;
FIG. 2 illustrates on a larger scale a detail of the apparatus illustrated in FIG. 1 and rotated relative thereto by 90.degree. and including an indication of the load rope; and
FIG. 3 is a view similar to the view of FIG. 1 of the vertically opened casing of the apparatus whereby the stop pawl is not illustrated.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The load carrying apparatus includes a casing 1 thereof having an outer contour 2. A load hook (swivel hook) 3 is pivotably mounted to the casing 1 such to pivot around the axis 4. The load hook 3 is mounted to an operating arm 5 to rotate therewith, which operating arm 5 is also pivotable around the axis 4. The apparatus has a connection portion identified by the reference numeral 6 for the load rope 7. As can be seen from FIG. 1, a stop pawl 9 is located at the mouth 8 of the hook, which stop pawl 9 is urged in a not specifically illustrated fashion by means of a spring member into a hook mouth 8 locking position in accordance with FIG. 1, whereby the stop pawl 9 is pivotable around the position 10. In FIGS. 1 and 3 the load hook 3 is in its operative position, in which it accordingly is adapted for carrying a load. The load hook 3 is pivotable into its nonoperational position, in which position thus the mouth 8 of the hook is opened and the load is released from the load hook 3 by means of a not illustrated device or system, respectively, for a remote controlling of the load hook 3. Such devices or systems, respectively, are generally known and, therefore, not particularly illustrated. Merely it can be noted, that electrical signals are transmitted via the remote control to magnets which move a locking rod system, which remo
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Diethelm Bruno
Reichmuth Mathias
Kramer Dean J.
Mitchell David M.
Schweizerische Eidgenossenschaft represented by Eidgenossische
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