Machine element or mechanism – Mechanical movements – Reciprocating to reciprocating
Patent
1986-07-23
1988-10-25
Braun, Leslie A.
Machine element or mechanism
Mechanical movements
Reciprocating to reciprocating
74 8915, B65G 6302, B60P 164, F16H 2500
Patent
active
047794747
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION AND PRIOR ART
This invention relates to a power unit of the type having extensible members for transferring articles.
The purpose of a power unit of this kind is to achieve a maximum extension of the power unit which is at least twice as much as the extension of the power unit in the contracted initial position. The power unit can be used in transferring load between two load vehicles, e.g. a lorry and a railway wagon, or between a load vehicle and e.g. a pallet. Since a load carrier for these vehicles often are approximately equally wide and it is desirable to be able to move the load from one load carrier to another load carrier in one step, so that the load is moved as far into the other load room as desired, the power unit must be able to be extended to a length, which is at least two times greater than its length in a contacted state. The expression at least two times refers to a length which exceeds twice the length of the shortest possible distance between the loads rooms. This distance is required because the two load vehicles frequently cannot be placed completely against each other.
A number of power units for the purpose mentioned above are already known. Among these a power unit according to U.S. Pat. No. 3,521,939 can be considered to be the basis of the present invention. This and other known power units have only one transmission and they possess as a result of the location of the transmission, the disadvantage that the force-lever ratio for the member to which the wheels are attached is very unfavorable. For that reason this member has to be made very strong and rigid, with the result that it becomes heavy, unhandy and voluminous as well as rather costly. The power unit tends through this location also to become rather high, seen in the direction of the normal of the load surface, which leads to its becoming ungainly and room demanding and by that also difficult to locate.
SUMMARY OF THE INVENTION
The object of the invention is to provide a power unit of the type wich varies its length, which reduces the above mentioned disadvantageous of the known power units and which provides easy transportation of objects from a first place to a place located at a distance from the first place which is greater than the length of the power unit in the contracted state. The transportation being carried out generally along a horizontal plane, however, the invention is not limited to horizontal planes. This object is obtained according to the invention by providing a first member having at least partly a housing for the power unit, the housing having an elongated cross section, the power device being disposed generally in the central region of the first member, and two transmissions being generally symmetrical in a mirror image relation to each other with respect to a plane comprising the longitudinal axis of the power device and being perpendicular to the greater dimension of the cross-sectional shape of the housing.
BRIEF DESCRIPTION OF THE DRAWINGS
With reference to the appended drawings, below follows a specific description of an embodiment of the invention chosen as an example. In the drawings:
FIG. 1 is a partly simplified view cut in the symmetry plane S--S of the power unit in accordance with the invention, dashed lines are used to indicate removal of a portion of the unit in order to compress the drawing,
FIG. 2 illustrates the same power unit as is illustrated in FIG. 1 in a partly sectioned view from the N-direction (FIG. 1), dashed lines are used to indicate removal of a portion of the unit in order to compress the drawing,
FIG. 3 is a detailed cross section view of said power unit along III--III, illustrating the mutual holding and guiding of the different members,
FIG. 4 is a detailed cross section view of the power unit along the cut IV--IV illustrating among other things the location of the chain transmission, and
FIG. 5 is a view of the same sort as FIG. 2, but of the power unit in a more extended state dashed lines are used to indicate removal of a portion of
REFERENCES:
patent: 421247 (1890-02-01), Cook
patent: 1088238 (1914-02-01), Muncy
patent: 2772573 (1956-12-01), Thomas
patent: 3174634 (1965-03-01), Peck
patent: 3212649 (1965-10-01), Johnson et al.
patent: 3396601 (1968-08-01), Wright
patent: 3521939 (1970-07-01), Fall et al.
patent: 3528303 (1970-09-01), Haller
patent: 3665771 (1972-05-01), Blatt
patent: 3727472 (1973-04-01), Maekawa
patent: 3751998 (1973-08-01), Vasilatos
patent: 3792619 (1974-02-01), Cannon et al.
patent: 3810397 (1974-05-01), Green
patent: 4028949 (1977-06-01), Hagen
patent: 4534697 (1985-08-01), Poncet
patent: 4553444 (1985-11-01), Blatt
patent: 4557657 (1985-12-01), Olson et al.
Anchell Scott
Braun Leslie A.
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