Multifunction clamp and jack system with attachments for variously shaped workpieces

1. A multifunction clamp and jack system for clamping, holding, or lifting variously shaped workpieces, comprising:

a generally C-shaped main body having an elongated first leg, a second leg extending perpendicularly outward from one end thereof with a square tubular socket adjacent extending a short distance upward therefrom for removably receiving selected workpiece engaging attachments, and a third leg extending perpendicularly outward from an opposed end in the same plane as said first leg with an internally threaded tubular member secured to the outer end thereof having a central axis aligned with said square tubular socket of said second leg;

an elongate externally threaded rod threadely engaged in said internally threaded tubular member to rotate relative thereto between a raised position and a lowered position, said threaded rod having a hexagonal top end portion with a square interior cavity, and a square interior cavity at a bottom end of said threaded rod,

said hexagonal top end portion adapted to receive to receive an open end wrench, a socket member of a socket wrench, ratchet wrench, electric wrench, or pneumatic wrench, and said square interior cavity of said hexagonal top end portion and said square interior cavity at said bottom end of said threaded rod adapted to receive to receive a male square drive member of a socket wrench, ratchet wrench, electric wrench, pneumatic wrench, or non-ratcheting breaker bar, for rotating said threaded rod; and

a plurality of interchangeable workpiece engaging rotary attachments, each having a drive stud member with a square end portion having a spring biased ball detent protruding from a flat surface thereof, and a cylindrical rotary portion that rotates relative to said drive stud having a workpiece engaging component configured to engage a workpiece;

said square end portion of said drive stud member configured to be selectively and removably engaged in said square tubular socket of said main body second leg, said square interior cavity of said hexagonal top end portion of said threaded rod, or said square interior cavity at said bottom end of said threaded rod.

2. The multifunction clamp and jack system according to claim 1 , further comprising:

a front base support member releasably connected adjacent to a front end of said second leg and a rear base support member releasably connected adjacent to a back end of said second leg configured to support said C-shaped main body member in a free standing upright vertical position.

3. The multifunction clamp and jack system according to claim 1 , further comprising:

a hole extending transversely through said threaded rod beneath said hexagonal top portion; and

a rod-shaped handle slidably and removably received in said hole for manually rotating said threaded rod.

4. The multifunction clamp and jack system according to claim 1 , further comprising:

a workpiece support member having a pair of flat rectangular legs joined together in laterally spaced apart parallel relation slidably received on lateral sides of said second leg and removably and pivotally connected adjacent to a front end thereof;

said workpiece support member being selectively pivoted between a lowered horizontal position with said legs generally parallel to and straddling said second leg said second leg and a raised vertical position with outer ends of said legs facing said bottom end of said threaded rod to receive and support workpieces of various sizes and configurations.

5. The multifunction clamp and jack system according to claim 1 , further comprising:

a series of spaced apart square apertures extending transversely through said elongated first leg of said main body, and a series of square sockets extending a short distance outward from opposed sides of said elongated first leg configured to receive said square end portion of said drive stud member of respective said workpiece engaging rotary attachments for storing them when not in use.

6. The multifunction clamp and jack system according to claim 1 , wherein

said cylindrical rotary portion member of each said workpiece engaging rotary attachment is formed of a bearing selected from the group consisting of a roller bearing, ball bearing, and thrust bearing, and the end opposite said square end portion of said drive stud is surrounded by an end cap having a cylindrical peripheral side wall and a flat end wall.

7. The multifunction clamp and jack system according to claim 6 , wherein said workpiece engaging rotary attachments are selected from the group consisting of:

a flat end free spinning rotary attachment wherein said workpiece engaging component is said flat end wall of said end cap;

an open angle rotary attachment wherein said workpiece engaging component is an inverted V-shaped member secured at its apex to said flat end wall of said end cap and having outwardly diverging rectangular legs configured to engage a workpiece;

a closed angle rotary attachment wherein said workpiece engaging component is a V-shaped member having outwardly diverging rectangular legs secured to said end cap side wall configured to engage a workpiece;

a straddle rotary attachment wherein said workpiece engaging component is a pair of rectangular straps secured at upper end to diametrically opposed sides of said cylindrical side wall of said end cap and extending from opposed sides thereof configured to straddle a workpiece;

a pointed rotary attachment wherein said workpiece engaging component is a V-shaped conical member secured at its base to said flat end wall of said end cap with its pointed end extending therefrom configured to engage a workpiece;

a chisel point rotary attachment wherein said workpiece engaging component is a chisel pointed member secured to said flat end wall of said end cap with converging V-shaped flat sides extending therefrom defining a beveled cutting edge configured to engage a workpiece; and

a ball rotary attachment wherein said workpiece engaging component is a spherical ball member with a neck portion secured to said flat end wall of said end cap such that said spherical ball is configured to engage a workpiece.