Traversing hoists – Having means facilitating assembly or disassembly – Of traversing hoist from support
Patent
1986-12-11
1988-02-09
Peters, Jr., Joseph F.
Traversing hoists
Having means facilitating assembly or disassembly
Of traversing hoist from support
B66C 2378
Patent
active
047236671
DESCRIPTION:
BRIEF SUMMARY
The invention relates to the chassis of a heavy road vehicle, particularly the carriage of a multiaxle mobile crane, according to the preamble of claim 1.
It is known to equip the chassis of, e.g., mobile cranes, with outriggers which extend transversely to the longitudinal axis of the vehicle. The support base for the operating position is increased by extending the outriggers with their vertical cylinders set on the ground. Thereby, much heavier loads can be lifted by the crane than would be possible without the outriggers.
Ordinarily, such mobile cranes are provided with two double casing outriggers of equal length--one pair for the front and one for the rear (considered with respect to the forward direction of travel of the vehicle). The rear pair of double casing outriggers forms the rear end of the mobile crane, and is always disposed to the rear of the rearmost rear axle. The front pair of double casing outriggers is always disposed between the slewing rim and the forwardmost front axle. As a rule, the front outrigger pair is disposed at a distance from the slewing rim which is at least as great as the distance from the slewing rim to the rear outrigger pair.
The two outrigger pairs of equal length form a 4-point support system, the connecting lines of which (also called "tilting edges") define a support surface which is at least square (but most often is rectangular), which surface to some extent determines whether the crane lifts a load successfully or whether it overturns. In the case of a rectangular support surface, the longer side runs parallel to the longitudinal axis of the vehicle.
The lifting capacity is determined by the shortest distance from the center of the slewing rim to the intersection point (i.e., terminus or vertex point) of the lateral connecting lines ("tilting edges") which run parallel to the longitudinal axis of the vehicle. A circle with radius equal to this distance from the center of the slewing rim forms a locus around the slewing rim upon which locus ideally all the outrigger support points should be disposed.
However, such 4-point support systems have major disadvantages, because in the case of a square support surface there are at best 4 contact points with the circle. In the case of a rectangular support surface there are only two contact points, which indicates poor utilization of the outrigger means.
According to the present invention, 3 outrigger pairs are employed, wherewith the middle, immediately forward of the slewing ring positioned double casing outrigger pair has the largest outrigger spread and dictates the radius of the circle upon which additional support points must lie. That radius is namely the distance from the middle of the slewing rim to the center of a vertical cylinder of the middle outrigger pair.
The centers of the vertical cylinders of the rear outrigger pair at the rear of the crane lie on the said circular line. The rear outrigger pair has a single casing construction in which the outrigger beams can meet in the middle in a common housing, when they are fully retracted.
The two short outrigger beams can be spread by means of, e.g., only one telescoping cylinder. This type of rear outrigger pair has a weight and cost about one-third the weight and cost of customarily used rear double casing outrigger pairs.
The centers of the vertical cylinders of the front outrigger pair are also disposed on the aforesaid circular line.
This outrigger pair comprises only two vertical cylinders, and is not extendable transversely to the longitudinal axis of the vehicle as are the middle and rear outrigger pairs. Because the part of the carriage forward of the outriggers does not have to accommodate any of the large bending and torsion forces exerted from the loadlifting device, this front part can have a much narrower, lighter, and cheaper construction than with former structures. The narrow front part also permits the front axle to have a larger turning angle, thereby making it easier to achieve the prescribed turning circles (i.e., to execute necessary tigh
REFERENCES:
patent: 2400803 (1946-05-01), Barnhart
patent: 2910189 (1959-10-01), Scheuerpflug
patent: 2914194 (1959-11-01), Brown
patent: 3393810 (1968-07-01), Craighead
patent: 4387814 (1983-06-01), Beduhn et al.
Avila Stephen P.
Peters Jr. Joseph F.
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