Patent ID: 8100626

Claim:
A linear drive machine providing versatile mobile mechanical power to an external tool comprising: a base enclosure including mobility capability; a motor located within said base enclosure; an elongated column having an upper end and a lower end, said lower end attached to said base enclosure and further said elongated column extends upwardly with respect to said base enclosure; an elongated slot configured in said elongated column; a threaded shaft rotatably mounted within said elongated column and coupled to said motor in a manner to receive rotational drive therefrom; a driving member engaging said threaded shaft to travel linearly in either of two opposite directions along the said elongated slot in response to rotation of said threaded shaft as driven by said motor; an elongated tubular bean having a first and a second end, operationally attached at said first end to said driving member in pivotal manner to allow varying inclination of said beam; an automatic release mechanism at an end point of said elongated slot, to disengage the said driving member; said driving member being operationally coupled to drive said external tool; a circular-hand-wheel affixed concentrically to said beam in a location near the said first end, and a mobile support stand made and arranged to support a central region of said beam via a sleeve bearing that allows rotation or said beam, said support stand thus acting as a fulcrum to elevate a second and opposite end of said beam when said driving member is driven downwardly and to lower the said second end of said beam when said driving member is driven upwardly; causing a reciprocating teeter-totter motion of said beam to perform a ground material related operation in a group that includes digging, trenching, picking, compacting and post hammering; and, said external tool is a shovel.