Boring or penetrating the earth – With above-ground means to advance or retract boring means
Reexamination Certificate
2005-08-09
2005-08-09
Bagnell, David (Department: 3672)
Boring or penetrating the earth
With above-ground means to advance or retract boring means
C175S171000, C254S285000, C254S387000
Reexamination Certificate
active
06926103
ABSTRACT:
The invention is a hoist system for a derrick with a derrick inside, a derrick outside, and a derrick top side; a splittable block connected to the derrick top side; a hoisting cable guided through the splittable block; a moveable trolley with a trolley top side and a trolley bottom side, wherein the trolley is connected to the splittable block and wherein the moveable trolley is removably secured on the derrick; and a hoist winch adapted to pull the hoisting cable over the derrick top side and through the splittable block to move the moveable trolley relative to the derrick.
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De Groot Anne Klaas
Roodenburg Joop
Bagnell David
Buskop Wendy
Buskop Law Group P.C.
Itrec B.V.
Stephenson Daniel P
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