초록 ▼

An apparatus for holding a workpiece is provided which will allow rotation of the workpiece within the apparatus. A generally stationary base (78) supports a rotatable assembly which includes a pair of outer rings (62,62′), at least one inner hoop (64,64′) positioned within each ring, and means (42,

An apparatus for holding a workpiece is provided which will allow rotation of the workpiece within the apparatus. A generally stationary base (78) supports a rotatable assembly which includes a pair of outer rings (62,62′), at least one inner hoop (64,64′) positioned within each ring, and means (42,112) for securing the workpiece substantially within the assembly are included in the apparatus. Bearing mechanisms (94,94′) on the base (78) engage portions of a respective outer ring to allow rotative movement of the assembly about an axis (52). Preferably the base is provided with means (84) for adjusting the distance between the outer rings (62,62′) along the axis (52). Means (101) for preventing the rotation of the assembly and workpiece may also be provided.

대표청구항 ▼

An apparatus for holding a workpiece comprising: a ground-engaging base; an assembly rotatably supported by said base, said assembly having an axis of rotation and including first and second outer rings each of the same diameter, said rings being spaced apart longitudinally along said axis, first an

An apparatus for holding a workpiece comprising: a ground-engaging base; an assembly rotatably supported by said base, said assembly having an axis of rotation and including first and second outer rings each of the same diameter, said rings being spaced apart longitudinally along said axis, first and second inner hoops each secured coaxially within a respective outer ring and each having a diameter less than said respective outer ring diameter; means for securing a workpiece substantially within said assembly; and wherein said securing means includes at least one adjustable jack mechanism, said jack mechanism having a base with a top side and a bottom side, a pair of spaced apart leg members extending from said base bottom side, and a telescoping member extending from said top side, said telescoping member being radially adjustable with respect to said assembly and having a free end adapted for contact with the workpiece, said leg members being designed and constructed to engage a portion of one of said inner hoops therebetween.