| 主权项 |
1. A tool mounting structure comprising:
a base plate suitable for mounting on a workbench; a bearing mounted on said base plate, said bearing having a rotational axis; a top plate mounted on said bearing, said top plate having a substantially planar top surface; a lower race secured to said base plate and an upper race secured to said top plate, bearing balls between said races so that said top plate rotates with respect to said bottom plate on a rotational axis defined by said bearing balls rolling in said races, a locking structure engaged between said base plate and said top plate to releasably lock said top plate in selected rotary position with respect to said base plate to maintain said top plate in the rotary position wherein the selected shop tool is accessible, said locking structure comprising a threaded shaft threadedly engaged in one of said plates, said threaded shaft having a locking end thereon so that when said threaded shaft is rotated in its plate, said locking end extends to engage against the other said plate to inhibit rotation of said plates with respect to each other; said substantially planar top surface being substantially at a right angle with respect to said axis so that when said axis is vertical, said substantially planar top surface of said top plate is substantially horizontal, said top surface of said top plate being configured for the mounting thereon of a plurality of shop tools so that any one of the shop tools can be selected for use and said top plate rotated to bring the selected shop tool to accessible position. |
