Woodworking – Special-work machine
Patent
1983-05-25
1985-05-07
Bray, W. D.
Woodworking
Special-work machine
144246F, 144343, B27L 100
Patent
active
045151920
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION AND PRIOR ART
This invention relates to a device of the kind which comprises at least two grabbing members, which are movable towards and away from each other by a pivoting movement of at least one of the grabbing members, and rolls associated with the grabbing members and adapted to follow the grabbing members during the pivoting movement and be applied against one or more trunks or wood pieces or other elongated objects in the device for feeding thereof at an angle to the pivotal plane of the grabbing members. Although this device may be used in any field of the technique it is especially suitable for forestry.
A device of this kind is previously known by the applicant's own U.S. Pat. No. 4,194,542. Pivotal grabbing members are very desirable to obtain good grabbing ability. To be able to use pivotal grabbing members in the device according to the patent, the rolls have been arranged pivotally movable on the grabbing members about axes extending parallel with although spaced from the pivot axes of the grabbing members. Thereby the rolls in contact with a trunk or the like may pivot relative to the grabbing members while these pivot toward and away from each other. In practice the rolls may while being applied against and propelling a trunk through the device oscillate about a balance position in which they have their axes of rotation essentially parallel. Accordingly, with only two diametrically opposed rolls one can effectivly hold and feed the trunk. Although this known device has more than fulfilled any expectations, it would be desirable to be able to simplify the device by avoiding pivotal mounting of the rolls on the grabbing members while maintaining efficient operation.
BRIEF DESCRIPTION OF THE INVENTION
The object of the invention is to fulfill this desire. The object in question is obtained according to the invention in that said at least one pivotally movable grabbing member and/or the other grabbing member, which itself may be pivotally movable, in another respect than by said already mentioned pivotal mobility is movably arranged to enable, within a range of movement, mutual movement of the grabbing members towards and away from each other without changing the mutual angular relation of the axes of rotation of the rolls in any essential degree. Accordingly, the rolls may be stationarily mounted on the grabbing members and despite this obtain such mutual movement of the grabbing members that the mutual direction of the rolls is maintained and thereby the trunks or the like having variable diameters can be held between the rolls and fed in the device.
It is preferred that both grabbing members are pivotally arranged on a base about hinges and that these hinges are movable toward and away from each other. By locking the grabbing members against pivotal movement, a linear displacement of the grabbing members and the rolls towards and away from each other may be obtained.
BRIEF DESCRIPTION OF DRAWINGS
Referring to the appended drawings, below follows a closer description of diagrammatically illustrated embodiments.
In the drawings:
FIG. 1 is an end view of the device according to the invention;
FIG. 2 is a view similar to FIG. 1 but with the grabbing members moved towards each other;
FIG. 3 is a view similar to FIG. 1 but showing the grabbing members moved away from each other;
FIG. 4 is a view illustrating a variant of FIG. 1; and
FIGS. 5, 6 and 7 are end views illustrating three different alternative embodiments.
DETAILED DESCRIPTION OF DIFFERENT EMBODIMENTS OF THE INVENTION
The device illustrated in FIG. 1-3 comprises a base 1, which is designed to be connected to a crane arm or other arbitrary carrying means which makes it possible to move the device via coupling means 2 arranged on the base in form of ears. Between the device and said crane arm, a rotator may be coupled to make it possible to rotate the device in its entirety about a vertical axis with the base depending downwardly.
The device comprises two grabbing members 3 and 4, which via hinges 5, 6 are pivo
REFERENCES:
patent: 4239067 (1980-12-01), Monenen
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