Mobile crane having telescoping outriggers and power operated screw means for same

A mobile crane comprising, an elongated main frame, ground engaging means on said frame for supporting said frame for movement over the ground, a superstructure rotatably mounted on said frame and having an elevational boom pivoted thereto;

• and a pair of outriggers each having an inner end pivotally secured to said main frame at a location intermediate the length of said frame, said inner end of said outriggers is of bifurcated construction and defines an outwardly facing recessed pocket, vertically positionable ground engageable means carried by the outer end of said outriggers, one outrigger being secured to said frame at each side thereof and about a vertical axis for swinging between a transport position alongside said elongated main frame and a boom operative position extending transversely outwardly of said main frame, said outriggers comprising an elongated box and an inner beam telescopingly slideable within said box for contraction within said box and extending from said box, power operated extension means mounted between said box and beam of each of said outriggers for telescopingly sliding said beam relative to said box, said recessed pocket being formed by a generally U-shaped plate extending transversely across said inner end of said outrigger and said motor means is secured to said U-shaped plate, said means comprising reversible motor means mounted on said U-shaped plate and in said pocket and having an elongated threaded shaft extending longitudinally within said box and beam of said outrigger, said threaded shaft extending from and rotatable in either direction by said motor means, and a non-rotatable threaded member carried by said beam and threadably engageable by said threaded shaft, whereby rotation of said shaft causes telescoping movement of said beam with said box, said beam having an inner end within said box, said inner end being formed by an inclined plate extending transversely across said beam, said inclined plate being inclined in a downwardly and inwardly position whereby said inclined plate can be located at least partially under said generally U-shaped plate of said box when said beam is contracted within said box.

A mobile crane comprising, an elongated main frame, ground engaging means on said frame for supporting said frame for movement over the ground, a superstructure rotatably mounted on said frame and having an elevational boom pivoted thereto;

• and a pair of outriggers each having an inner end pivotally secured to said main frame at a location intermediate the length of said frame, said inner end of said outriggers being of bifurcated construction and defining an outwardly facing recessed pocket, said recessed pocket being formed by a generally U-shaped plate extending transversely across said inner end of said outrigger, vertically positionable ground engageable means carried by the outer end of said outriggers, one outrigger being secured to said frame at each side thereof and about a vertical axis for swinging between a transport position alongside said elongated main frame and a boom operative position extending transversely outwardly of said main frame, said outriggers comprising an elongated box and an inner beam telescopingly slideable within said box for contraction within said box and extending from said box, said beam being of hollow construction, power operated extension means mounted between said box and beam of each of said outriggers for telescopingly sliding said beam relative to said box, said extension means including a reversible hydraulic motor mounted on said U-shaped plate and having an elongated threaded shaft extending therefrom and rotatable in either direction, said threaded shaft extending longitudinally within said box and beam of said outrigger;
• and a non-rotatable threaded member carried by said beam and threadably engageable by said threaded shaft, whereby rotation of said shaft causes telescoping movement of said beam within said box, said beam having an inner end within said box, said inner end being formed by an inclined plate extending transversely across said beam, said inclined plate being inclined in a downwardly and inwardly position whereby said inclined plate can be located at least partially under said generally U-shaped plate of said box when said beam is contracted within said box.