Traversing hoists – Having means facilitating assembly or disassembly – Of traversing hoist from support
Patent
1991-11-13
1993-03-30
Sotelo, Jesus D.
Traversing hoists
Having means facilitating assembly or disassembly
Of traversing hoist from support
212188, 212261, B66C 2334
Patent
active
051976153
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a crane in accordance with the preamble of claim 1.
FIELD OF THE INVENTION
The crane is intended for lifting goods, i.e. functions as a lifting crane, and/or as a carrier for working implements, such as tree-felling saws, branching and barking tools, feeders etc. The crane can be mounted on a fixed station or mounted on a vehicle.
A crane of this kind is known from Swedish Patent Specification No. 7411568-4. The present invention is a further development of this known crane, and is intended to provide a crane in which during a working operation, the moment of force will be substantially constant throughout the whole of the normal working range of the crane, and also to provide a crane which can be brought to a compact transport state.
This can be achieved with a crane having the characteristic features set forth in the following claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail with reference to two exemplifying embodiments thereof and with reference to the accompanying drawings, in which FIGS. 1 and 2 illustrate one embodiment of the inventive crane, and FIGS. 3 and 4 illustrate another embodiment of the invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The illustrated crane comprises, in principle, a column 1 which is rotatably mounted on a foundation structure (not shown) which may be either stationarily positioned or located on some kind of vehicle. The column 1 carries an arm section 2 which is pivotal in the vertical plane and which, in the same plane, pivotally carries a rocker arm 3, the free end of which is intended to carry a load. The arm section 2 comprises two arms 4 and 5 which extend substantially parallel with one another and between which a manoeuvering device 6 is mounted, said device having the form of one or two hydraulic piston-cylinder devices. The mutually parallel arms 4 and 5 are pivotally connected to a common arm or yoke 7.
According to the invention, the arm section 2 is carried by a carrier arm 8 which is pivotally journalled to the column 1. Arranged between the column 1 and the yoke 7 is a first manoeuvering piston-cylinder device 9, which is operated hydraulically. A second, hydraulically-operated manoeuvering piston-cylinder device 10 is mounted between the column 1 and the carrier arm 8.
In the embodiment illustrated in FIGS. 1 and 2, the arm section 2 is carried by the carrier arm 8 through the intermediary of a journal shaft 11 provided on the yoke 7. In the case of this embodiment, the first piston-cylinder device 9 is pivotally connected to the yoke 7 via a first link arm 12. This first link arm has pivotally mounted between its respective journal points on the yoke and manoeuvering piston-cylinder device a second link-arm 13 which is pivotally connected to the carrier arm 8.
The ends of the arms 4 and 5 of said arm section 2 distal from the yoke 7 are connected together by means of a rocker-arm yoke 14 in the manner illustrated in the Figures, so that the arm 4 is directly pivotally connected to the rocker-arm yoke and the arm 5 is pivotally connected to the rocker-arm yoke 14 via a link-arm 15 which is connected to the yoke approximately centrally thereon. The arm 5 is also pivotally connected to the rocker arm 3 in a bearing 16, this rocker arm 3 also being connected, through a bearing 17, to the end of the rocker-arm yoke 14 distal from the arm 4.
FIG. 2 illustrates the positional state of the arm section 2 with rocker arm 3 in an upstanding position relative to the carrier arm 8 with the yoke 7, this upstanding position being governed by the manoeuvering piston-cylinder device 9. In the illustrated case, the manoeuvering piston-cylinder device 9 is duplicated, as are also the link arms 12 and 13, in a manner such as to enable the arm section 2 with rocker arm 3 to be collapsed over the carrier arm 8, as illustrated by the broken line 18. FIG. 2 also illustrates schematically a positional state in which the arm section 2 is collapsed substanti
REFERENCES:
patent: 2500815 (1950-03-01), Gerli et al.
patent: 3775798 (1973-12-01), Thorton-Trump
patent: 4150754 (1979-04-01), Schmitt
patent: 4583906 (1986-04-01), Frisbee
patent: 4895263 (1990-01-01), Saint Gerand
patent: 5016767 (1991-05-01), Thibault
Avila Stephen P.
Mo-Trac Gunnarson & Larsson Handelsbolag
Sotelo Jesus D.
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