Method and apparatus for withdrawing a machine shaft
AssigneeHarnischfeger Corporation
InventorsClifton L. Sanders, Harvey J. Kallenberger
Life of this patent
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Abstract
The new method relates to a machinery assembly having (a) a housing, (b) an eccentric confined in the housing, (c) a shaft extending into the eccentric and (d) a shaft axis of rotation. A method for moving the shaft with respect to the housing includes the steps of applying a support force at a point on the housing so that such force places the housing substantially in equilibrium with respect to the axis. A withdrawing force is then applied to the shaft in a direction generally parallel to the axis. A jacking mechanism contacts the housing at a point to apply a support force to such housing. The force magnitude and direction place the housing substantially in equilibrium with respect to the axis to reduce or eliminate frictional forces.
Claims12
In a dragline walk leg assembly having (a) an eccentric housing, (b) a walk leg eccentric confined in the housing, (c) a shaft extending into the eccentric and (d) a shaft axis of rotation, a method for moving the shaft with respect to the housing and including the steps of:
- applying an upwardly-angled support force at a point on the housing below the axis of rotation to place the housing substantially in equilibrium with respect to the axis;
- and,
- applying a withdrawing force to the shaft in a direction generally parallel to the axis.
In a dragline walk leg assembly having (a) a housing, (b) an eccentric confined in the housing, and (c) a shaft extending into the eccentric and having a shaft axis of rotation, the improvement comprising:
- a jacking mechanism extensible to contact the housing at a point and apply a support force at a nonvertical angle thereto and,
- the support force has a magnitude and acts in a direction to place the housing substantially in equilibrium with respect to the axis,
- whereby frictional forces on the shaft are substantially reduced and the shaft may be readily moved with respect to the housing.
Dependencies are inferred from the claim text.