Tool-holding device and tool support

A tool-holding device of the type having a mounting portion, a socket connected to said mounting portion, and at least two setscrews, said socket having a wall and an end face and including a first bore for receiving the shank of a tool support or the like and at least two further bores passing through said wall, and said at least two setscrews being respectively disposed in said at least two further borres, wherein the improvement comprises one or more of said at least two setscrews each having a beveled or faceted surface at the end thereof intended to be situated nearest said shank, said at least two further bores being disposed parallel to one another, two of said at least two setscrews being respectively disposed in said at least two further bores, the longitudinal axis of each of said at least two further bores forming an angle greater than 0.degree. to about 5.degree. with a straight line perpendicular to the longitudinal axis of said socket and said end face at said socket being concave.

A tool support for use with a tool-holding device, of the type having an end face and a shank intended to be inserted into a bore of said tool-holding device, wherein the improvement comprises a first chucking surface formed on the outside of said shank for cooperating with a setscrew of said tool-holding device, said first chucking surface not running parallel to the longitudinal axis of said shank, and said end face being concave.

A tool support for use with a tool-holding device, of the type having an end face and a shank intended to be inserted into a bore of said tool-holding device, wherein the improvement comprises a first chucking surface formed on the outside of said shank for cooperating with a setscrew of said tool-holding device, further comprising one or more additional chucking surfaces formed on the outside of said shank, wherein said first chucking surface forms an angle of about 45.degree. with the longitudinal axis of said shank, said one or more additional chucking surfaces each forming an angle of more than 0.degree. to about 5.degree. with the longitudinal axis of said shank and said end face being concave.

An extension or reduction part for use with a tool-holding device, of the type having a shank intended to be inserted into a bore of said tool-holding device, a socket, and one or more setscrews, said socket having a wall and an end face and including a first bore for receiving a tool support and one or more further bores passing through said wall, and said one or more setscrews being respectively disposed in said one or more further bores, wherein the improvement comprises a first chucking surface formed on the outside of said shank for cooperating with a setscrew of said tool-holding device, said first chucking surface not running parallel to the longitudinal axis of said shank, further comprising one or more additional chucking surfaces formed on the outside of said shank, wherein said first chucking surface forms an angle of about 45.degree. with each of said one or more additional chucking surfaces and said end face is concave.