Material or article handling – Self-loading or unloading vehicles – Loading or unloading by other carrier or mover means – and...
Patent
1995-06-13
1997-01-07
Werner, Frank E.
Material or article handling
Self-loading or unloading vehicles
Loading or unloading by other carrier or mover means, and...
414539, 414546, 414569, 114344, 2804141, 254325, 405 1, B60P 310
Patent
active
055909973
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a trailer device including a chassis supported by wheels, a coupling device in the front of the trailer for connecting the trailer to a towing vehicle, and a winch to facilitate movement of an object along the trailer. In particular the invention relates to the trailer utilized as a lifting device for a boat.
When loading and unloading a trailer, in most cases it is necessary to move heavy objects vertically as well as horizontally to and from the trailer. If the object is heavy, access to a lifting device or assistance from other persons is usually required to perform the vertical movement. This leads to essential limitations with respect to the usefulness of the trailer.
At launching and loading of pleasure-boats it is common practice to make use of a special boat trailer and a slanted ramp by means of which the trailer can be driven down into and out of the water. As a result of this procedure the most sensitive components on the boat trailer are lowered into the water, possibly causing corrosion damage. Furthermore, at least two persons are usually necessary. When launching and loading a boat utilizing the prior art boat trailer and a ramp. One person is usually necessary to handle the towing vehicle and the boat trailer and another person is necessary in the boat.
SUMMARY OF THE INVENTION
The aim of the present invention is to provide a trailer device which eliminates said inconveniences and which can be operated by one person; particularly launching and loading of a boat from a quay, a pier or the like. In accordance with the invention, this aim is obtained in that the device comprises a lever having a first and second arm, whose arms form an angle with respect to each other and are pivoted at an axis of rotation which is oriented transversally at the back of the trailer. The first arm of the lever, which mainly points forward from the axis of rotation. has a length that exceeds or falls below the length of the other arm of the lever. Parallel arm elements comprise the first and second arms whose ends are connected to the ends of the axis of rotation and which at their outer ends are linked by transversal beams, at which the distance between the outer ends of the first arm exceeds or falls below the distance between the outer ends of the second arm and limits the width of the objects that can be loaded onto or off of the trailer. A winch tower with a winch is provided at the front end of the trailer, whereby the wire of the winch is adapted to run over the outer ends of the first and second arms and at one end is provided with lifting means for the object. The device also includes means adapted to prevent motion between the first and second arms and the wire during predetermined stages of the loading or unloading of the object.
To prevent motion during the predetermined stages of loading or unloading of the object, the transversal beam is provided with a block through which the wire runs, which locks the wire in one direction and allows it to run in the other. Alternatively, to prevent motion during the predetermined stages, the transversal beam is cylindrical and pivoted in the outer ends of the arm elements. The wire is guided at least one turn around the cylindrical transversal beam and the motion prevention means comprises a cotter pin that slides into the cylindrical transversal beam from the arm element to prevent the rotation of the beam.
In accordance with another characteristic feature of the invention, the trailer device includes a second winch, which facilitates loading and unloading of the trailer device especially when it is to be performed by one person. The second winch has a wire adapted to be connected to one end of the object and which is adapted to pull the object forward when it is to be placed on the chassis, whereafter the wire of the first winch is loosened.
In accordance with another characteristic feature of the invention, the second arm of the lever can be lowered against the front end of the trailer when the a
REFERENCES:
patent: 2058473 (1936-10-01), Le Tourneau
patent: 2557580 (1951-06-01), Summers
patent: 2571361 (1951-10-01), Harmanson
patent: 2834492 (1958-05-01), Roy, Sr. et al.
patent: 3132758 (1964-05-01), Linton
patent: 3180622 (1965-04-01), Fillion
patent: 3764020 (1973-10-01), Batson
Altnas Martin
Fredriksson Mattias
Swedish Mercoring HB
Werner Frank E.
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