Traversing hoists – Overhead – Cable
Patent
1984-05-30
1985-12-17
Barefoot, Galen L.
Traversing hoists
Overhead
Cable
244115, 244116, 114258, 114261, B64F 122
Patent
active
045587906
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a system which achieves the controlled movement against surging or other deviation across a surface, which could be rolling, pitching, heaving or inclined, of a load which could be carried on a combination of castoring and fixed wheels or be capable of skidding or sliding over the surface, or to provide control of the movement of a lighter than air body in circumstances where it is sufficiently close to the ground, with the minimum of cables.
The controlled movement is effected by varying the tension and pull in or pay out of a number of running cables connected to fixing points on the load via pulleys carried on "trolleys" which in turn are guided by tracks extending along each side of the area to be traversed. Each "trolley" is located relative to the load by a second cable of set length obliquely from the "trolley" to another fixing point on the load remote from that to which its running cable is attached.
Should there be an increased requirement for lateral restraint on either or both ends of the load in relation to forward or backward towing capacity opposite pairs of running cables can be led through pulleys at their attachment points at the load and terminated back on their respective "trolleys" and thus double their mechanical advantage in lateral restraint.
Where the concepts of this invention are used to move and restrain loads across an inclined surface there could be combinations of load weight, rolling or sliding friction and degree of surface inclination where only the uphill rail and its "trolleys" and cables are necessary.
Additional applications of the cable, rail and "trolley" basic concept already described could be in the control of ships, lighters or floating masses in confined and/or tortuous waterways or docks of a length limited to the practicable length of cable employable, and in the guidance of lighter than air ships to and from mooring pylons and hangar.
More specifically, this invention relates to the problems of moving helicopters or other aircraft from the position of initial restraint by mechanical or other means after landing on a ship's flight deck, into a hangar or secure stowage area and, when required, provides for the movement back thereof to the take off position--both operations may have to take place in heavy weather and consequent violet ship motion.
The invention in fact provides an alternative to present traverse and restraint systems devised by the various naval defence forces. It can be used in combination with the initial decklocks employed in any of these systems. It is equally effective with tricycle or tailwheel aircraft types.
The invention permits the steering of an aircraft from the landing position into an offset or centerline hangar or secure stowage, and similarly its ranging for take off, without tire scuffing and with the minimum possibility of inadequate restraint in rough weather. Basically the system relies on two operators, under the control of a Landing Safety Officer, controlling four winches whose cables each lead to "trolleys" running in low profile guide rails fixed to the flight deck and bounded by shallow ramps. A further two winches may be used in relation to a second hangar.
Each winch cable passes through a sheave carried by its associated "trolley" whence it leads to one of four fixing points on the aircraft, two on either side thereof. A second cable of set length according to aircraft type connects each trolley to the other fixing point on that side of the aircraft.
It will be appreciated that the two after winches can provide lateral restraint, steering and a braking function for tail wheel aircraft during a move forward into the hangar, while the forward winches are used principally to tow the aircraft while at the same time providing lateral restraint to the aircraft should ship's roll invite a sideways skid of main wheels. A reverse of this operation will range the aircraft for take off. The steps of these operations are described later in the specification.
The term "trolley" has been used in a broad s
REFERENCES:
patent: 1708912 (1929-04-01), Alexander
patent: 2411382 (1946-11-01), Martin
patent: 3065861 (1962-11-01), Cruciani
patent: 3333713 (1967-08-01), Cruciani
patent: 3640490 (1972-02-01), Baekken
Barefoot Galen L.
The Commonwealth of Australia Department of Defense Support
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