# US 4,394,913 A · Crane having power operated outriggers and lock means therefor

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- Number: US 4,394,913 A
- Document ID: US4394913A
- Status: Granted
- Kind: A
- Application number: 06/203,944
- Filed: 1980-11-07
- Granted: 1983-07-26
- Earliest claimed: 1980-11-07
- Assignees: Harnischfeger Corporation
- Inventors: John M. Lanning; Stephan R. Epps
- Web page: https://patentgrep.com/patent/US4394913A

## CPC

- B66C 23/78: Supports, e.g. outriggers, for mobile cranes
- B66C: CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES ({specially adapted for lifting invalids A61G7/10;} rope, cable, or chain winding mechanisms, braking or detent devices therefor B66D; specially adapted for nuclear reactors G21)

## Abstract

A crane of the type having a boom and which requires transversely swingable outriggers to stabilize the crane when the boom is in operation. Power operated means are provided between the main frame of the crane and the outriggers for swinging the outriggers to any one of a number of positions. Power operated locking means are also provided between the main frame of the crane and the outriggers for locking the latter in their selected position.

## Claims

### Claim 1

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, 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 inner end of said outriggers being of bifurcated construction formed by a generally semi-circular plane welded transversely across said inner end and defining an outwardly facing recessed pocket, power operated means mounted on said outriggers and in said pocket for swinging said outriggers relative to said main frame, said power operated means comprising a hydraulic motor and a gear reducer driven thereby, said motor and reducer being disposed in a vertical direction, and a pinion gear attached to the lower end of said reducer and driven by said reducer, and a gear segment secured to said main frame adjacent a lower side of said main frame, said segment being in mesh with said pinion gear whereby rotation of said pinion gear causes swinging of said outrigger.

### Claim 2 (depends on 1)

The crane set forth in claim 1 including power operated locking means between said main frame and said outrigger for locking the outrigger in any selected position, said locking means comprising a locking plate fixed to and swingable with said outrigger, and a power operated shiftable lock pin means carried by said frame and engageable with said locking plate.

### Claim 3 (depends on 2)

The crane set forth in claim 2 further characterized in that said power operated shiftable lock pin means includes a hydraulically actuated cylinder having a pin extensible therefrom and engageable with said locking plate.