Patent attributes
A tool retaining plate has a disc base with a holding surface and a mounting surface. Sets of sleeving columns are configured at interval on the mounting surface and are of an octagonal columnar pattern to define a column head end, a column foot end and a circumferential portion. Four abutting surfaces and four locking surfaces are cross connected at the circumferential portion, and an angular locking portion is formed between the abutting surface and locking surface. Positioning bulges are protruded externally onto two opposite abutting surfaces of the circumferential portion of the sleeving column, opposite to the positioning flanges of the sleeve. This enables engagement with the positioning flanges on the slot wall of the square slot of the sleeve. Two locking portions configured diagonally and set adjacent to the abutting surface with positioning bulges are set into a notched pattern or offset towards the abutting surface.
