Patent ID: 6050740
Filing Date: 2000-04-18
Classification: E02D,Y10T

Abstract:
A combined lock dog and Kelly bar adapter for drivingly connecting a Kelly bar to a wrench tube and shaft of an earth anchor, the earth anchor shaft being received within the wrench tube; and adapter including a unitary one-piece body comprising:a first section defining a first socket sized and shaped to removably receive the Kelly bar;a second section defining a second socket sized and shaped to removably receive the earth anchor shaft;a pin which extends radially into the second socket, the pin being sized to extend through an opening in the wrench tube to engage the anchor shaft to axially fix the anchor shaft in the adapter; the pin being biased inwardly into the second socket by a spring element; the pin being rotatable in a bore in the adapter; the pin being brought into and out of engagement with the anchor shaft and the wrench tube by rotation of the pin; the Kelly bar adapter including a camming surface for selectively positioning said pin relative to said anchor shaft; and said camming surface comprising a sloping wall extending radially outwardly from an outer surface of said adapter, said pin including a ring which rides on said wall, said ring cooperating with said wall to selectively position said pin relative to said anchor shaft.