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US 5,076,448 AGranted
Portable hydraulic crane
AssigneeHein-Werner Corporation
InventorJames G. Ballard
Life of this patent
Estimating the term…
Abstract
The crane having a generally trapezoidal frame with a caster wheel at each corner. A mast is mounted on the front of the frame with a brace between each rear corner and top of the mast. Spring loaded pins are used for these connections. A lifting ram is pivotally connected to the mast and to a telescopic boom pivoted on the mast. The frame has a socket on each side and a telescopic leg including inner and outer tubes is mounted in each socket. A spring loaded pin fixes the tubes relative to each other. The end of each leg has a wheel. Each leg can pivot relative to its sleeve to enable raising the leg to position the distal end near the mast. The legs can be disconnected from the sleeves and a locking device prevents removal of the legs.
Claims18
A crane comprising:
- a base including a pair of spaced apart leg support members, each of the leg support members including a socket,
- a mast mounted on the base and extending upwardly from the base, the mast having an upper end,
- a boom pivotally connected to the upper end of the mast,
- a lifting ram having opposite ends, one end pivotally connected to the mast and the other end pivotally connected to the boom,
- a pair of crane legs each having opposite ends, one end of one of the crane legs being selectively housed in one of the sockets in telescoping relation and one end of the other crane leg being selectively housed in the other of the sockets in telescoping relation, and
- means for pivotally connecting one end of one of the legs to one of the leg support members, and means for pivotally connecting one end of the other of the legs to the other of the leg support members, the means for pivotally connecting providing for pivotal movement of the legs from a horizontal position to a generally vertical stored position adjacent the mast.
3 more elements
A crane comprising:
- a base including a pair of spaced apart leg support members, the leg support members each having forward ends and rearward ends, and a rigid member located between the leg support members, the rigid member having one end fixed to one of the leg support members and the other end fixed to the other leg support member,
- a mast mounted on the base and extending upwardly from the base, the mast having an upper end,
- a boom pivotally connecting to the upper end of the mast,
- a lifting ram having opposite ends, one end pivotally connected to the mast and the other end pivotally connected to the boom,
- a pair of crane legs each having opposite ends, one of the crane legs being supported by one of the leg support members and the other of the crane legs being supported by the other of the leg support members,
- a first pair of wheels supporting the forward ends of the spaced apart leg support members, and a second pair of wheels supporting the rearward ends of the leg support members, the second pair of wheels having one of the wheels spaced rearwardly of the rearward end of one of the leg support members and the other of the wheels spaced rearwardly of the rearward end of the other of the leg support members, and
- a bracket having opposite ends, one end of the bracket being fixed to a rearward end of one of leg support members and the other end of the bracket being fixed to a rearward end of the other of the leg support members, the second pair of wheels being positioned beneath the bracket and supporting the bracket.
4 more elements
A crane comprising:
- a base including a pair of spaced apart generally elongated tubular sockets, each socket having an open forward end and a rearward end,
- a mast mounted on said base and extending upwardly from the base, the mast having an upper end,
- a boom pivotally connected to the upper end of the mast, the boom having an outer end adapted to support a load,
- a lifting ram having opposite ends, one end pivotally connected to the mast, and the other end pivotally connected to the telescopic boom,
- a pair of legs each having opposite ends, one end of one of the legs being removably housed in telescoping relation in one of the elongated tubular sockets, and one end of the other of the legs being removably housed in telescoping relation in the other of the elongated tubular sockets, and
- means providing a pivotal connection between the legs and the sockets to enable the legs to pivot from a horizontal position to a generally vertical position near the mast, the means for providing a pivotal connection including means for selectively disconnecting the legs from the sockets.
3 more elements
A crane comprising:
- a base including a pair of spaced-apart leg support members, each of the leg support members including a leg support socket, and a mast support member including a mast socket,
- a mast supported by the base and extending generally upwardly from the base, the mast having an upper end, and a lower end adapted to be housed in the mast socket, and the mast being removably supported by the mast socket, the mast further having therein a bore adapted to house a pair of pins having grooves and means for releasably engaging the pins when housed in the bore to selectively prevent removal of the pins from the bore, said means for releasably engaging the pins including a locking pin, the locking pin including a pair of ends adapted to be housed in the grooves, and a spring for biasing the ends of the locking pin into engagement with the grooves,
- a boom pivotally connected to the upper end of the mast,
- a lifting ram having opposite ends, one end pivotally connected to the mast, and the other end pivotally connected to the boom,
- a pair of crane legs each having opposite ends, one end of one of the crane legs being housed in one of the leg support sockets in telescoping relation, and one end of one of the other crane legs housed in the other of the leg support sockets in telescoping relation, and
- a pair of vertical braces, one of the vertical braces having a lower end connected by a pin to one of the leg support sockets and the other of the vertical braces having a lower end connected by a pin to the other of the leg support sockets, and means for releasably connecting the upper ends of the braces to the upper end of the mast, said means comprising a pair of pins housed in the bore in the mast, the first pin having therein a groove and being fixed to the upper end of one of the braces, and the second pin having therein a groove and being fixed to the upper end of the other of the braces.
3 more elements
Dependencies are inferred from the claim text.