Center pin assembly for power shovels

Details Center pin assembly for power shovels Center pin assembly for power shovels

1978-12-22

1980-12-02

Kunin, Stephen G.

Material or article handling

Vertically swinging load support

Shovel or fork type

308220, 308136, 414690, E02F 300

Patent

active

042368634

ABSTRACT:
In a power shovel having a lower frame and an upper frame rotatably supported on the lower frame, a center pin assembly for carrying radial and axial loads imposed on the upper frame comprising a downwardly opening socket mounted on the lower frame, a pin disposed on the axis of rotation of the upper frame, the pin having a center section and an annular section, the center pin section having an upper end rigidly secured to the upper frame and a lower portion extending downwardly into the socket, the annular pin section being interposed between the socket and the lower end of the center pin section, the annular pin section and the socket having bearing contact surfaces, axially spaced, annular sealing rings disposed between the lower portion of the center pin section and the annular pin section providing an annular variable volume chamber therebetween and means for supplying a measured volume of fluid to the variable volume chamber to effect a predetermined displacement between the center pin section and the annular pin section and correspondingly a predetermined clearance between the bearing contact surfaces of the annular pin section and the socket.

REFERENCES:
patent: 749172 (1904-01-01), Cutting
patent: 922124 (1909-05-01), Freeburg
patent: 1473935 (1923-11-01), Horton
patent: 2380626 (1945-07-01), Zeilman et al.

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