Swivel knife for manual operation with blade holder offset skewably from handle

Claim 1

A cutting instrument for manual operation and comprising: an elongated handle having a handle axis and a front end, a blade holder mounted skewably on the front end of the handle about a lateral axis that is normal to the handle axis, means for fixing the holder in skewable relationship to the handle, a blade with a shank for reception in the holder, the holder being elongated and hollow and having a holder axis, a rod mounted along the holder axis and rotatable about said holder axis, an upper end of the rod being threaded and a lower end being slitted and the rod being provided near its lower slitted end with a cylindrical enlargement, a thimble connected to the upper end of the rod with the thimble serving to retain the rod in the holder, the lower end of the rod being threaded and tapered, a bushing connectable screwably to the lower end of the rod, the lower end of the rod and the bushing serving as a collet to hold the blade, a cap engageable with the bushing whereby the cap is retained in place and whereby the cap serves for turning the bushing.