Pump jack and method

Details Pump jack and method Pump jack and method

2005-05-05

2010-02-16

Mitchell, Katherine W (Department: 3634)

Fire escape, ladder, or scaffold

Pole or strand grasping-type climber

Alternate grasping

C182S133000, C182S134000, C248S243000, C248S245000

Reexamination Certificate

active

07661512

ABSTRACT:
A pump jack for a scaffold in a system to support a work platform and move the platform up and down a pole to access a vertical work surface. The pump jack includes an L-shaped framework having a horizontal frame member which supports the work platform and a vertical frame member. The vertical frame member having laterally opposing Z-shaped channels, each having a leg that bends about the pole and extends inward toward the pole. The pump jack includes an upper shackle supported by the framework. The pump jack includes a lower shackle supported by the framework, which with the upper shackle applies a coupling force for gripping the pole. The pump jack includes a pump arm lever pivotably coupled to the vertical frame member to step upwardly the pump jack relative to the pole. The pump jack includes a crank mechanism coupled to the vertical frame member. A method for supporting and moving a work platform up and down a pole to access a vertical work surface.

REFERENCES:
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patent: 1597095 (1926-08-01), Martinsen
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patent: 4463828 (1984-08-01), Anderson
patent: 4942941 (1990-07-01), Anderson
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patent: 6241045 (2001-06-01), Reeve et al.
patent: 6273381 (2001-08-01), Riblet
patent: 6711867 (2004-03-01), Smith

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