Abstract

An apparatus for releasably holding a tubular toolholder shank (56) includes a tool support member (20); a canister (30) disposed within the tool support member (20); a lock rod (110) movable within the tool support member (20) in a reciprocating motion for pulling the tubular toolholder shank (56) into a locked position and for releasing the tubular toolholder shank (56) to an unlocked position; and at least two locking elements (101) engaging the lock rod (110) so that movement of the lock rod (110) causes the locking elements (101) to extend outward to engage the tubular toolholder shank (56). The lock rod (110) includes a relief cavity (118) extending rearward from a forward end (114) of the lock rod (110). The lock rod (110) has a maximum outer diameter (Dmax) and the relief cavity (118) has a maximum diameter (dmax). A ratio of the maximum diameter (dmax) of the relief cavity (118) to the maximum outer diameter (Dmax) of the front portion (111) of the lock rod (110) is greater than 1 to 4.

IPC Classes  ?

• B23B 29/14 - Special arrangements on tool holders affording a yielding support of the cutting tool, e.g. by spring clamping
• B23B 29/12 - Special arrangements on tool holders
• B23B 29/04 - Tool holders for a single cutting tool
• B23B 27/16 - Cutting tools of which the bits or tips are of special material with exchangeable cutting bits, e.g. able to be clamped