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US 4,196,815 AGranted
Twin-type slewing crane
AssigneeAktiebolaget Hagglund & Soner
InventorsGote O. Gremert, Salomon E. Lundkvist
Life of this patent
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Abstract
Two mechanically identical cranes whose luffing jibs have the same maximum and minimum out-reach and which have their own slewing machinery, are mounted via respective supporting structures on a common foundation, at the same level for rotation about the same axis by bearings and an axle which provide a compact journalling of the supporting structures upon the foundation.
Claims27
A twin-type slewing crane, comprising:
- a foundation;
- a ring gear mounted on the foundation so as to have a generally vertically extending central axis;
- two individual cranes, each having:
- a luffing jib with means including a hoisting rope running from a winch of that crane to said job thereof for raising and lowering the jib;
- a supporting means for each crane, each mounting the respective crane for rotation about said central axis at the same distance from said central axis as one another;
- a rotating mechanism on each crane and projecting therefrom into meshing relation with said ring gear, whereby operation of said rotating mechanism of at least one of said cranes propels at least that respective crane about said central axis;
- central axle means coaxially disposed on said central axis,
- the central axle having at least two axially spaced bearings thereon which journal the supporting means of one of said cranes for rotation about said central axis;
- and
- the supporting means of the other of said cranes being at least partially arranged within the supporting means of said one crane,
- each one of said supporting means including horizontally opening recess means which accommodates each other of said supporting means, these two supporting means thus being disposed at a common height from said foundation.
8 more elements
A twin-type slewing crane, comprising:
- an upright foundation with a ring gear secured thereon, the ring gear having a generally vertical central axis;
- a generally horizontal base plate;
- an annular bearing having a first race coaxially provided on the foundation and a second race coaxially provided on the base plate, and by which the base plate is journalled for rotation about said central axis on the foundation;
- two individual cranes, each having:
- a luffing jib with means including a hoisting rope running from a winch of that crane to a jib thereof for raising and lowering the jib;
- a supporting means for each crane, each mounting a respective crane for rotation about said central axis at the same distance from said central axis as one another;
- a rotating mechanism for each crane and projecting therefrom into meshing relationship with said ring gear, whereby operation of said rotating mechanism of at least one of said cranes propels at least that respective crane about said central axis;
- the supporting means of one of said cranes being mounted on the base plate for rotation therewith, and having means defining a generally vertical opening therethrough having two axially spaced, generally horizontally opening notches intersecting therewith;
- a central axle means coaxially disposed on said central axis, extending through said generally vertical opening and into both of said notches, and being fitted to said supporting means of said one crane, whereby said axle is connected for rotation about the longitudinal axis thereof with said supporting means of said one crane;
- two axially spaced bearings having an inner race on said central axle, a respective one within each of said notches and an outer race on the supporting means of the other of said cranes;
- and anti-tipping roller means between said supporting means of said other crane and said base plate.
8 more elements
Dependencies are inferred from the claim text.