Patent ID: RE43718

Claim:
A cutting tool assembly comprising: a) a rigid holder blade, said rigid holder blade comprising: a body portion, a base jaw integrally formed with said body portion, a clamping jaw having a leading portion, said clamping jaw being integrally formed with said body portion and being resiliently and pivotally displaceable relative to said base jaw, an insert receiving slot having a leading portion and a trailing portion, said slot being defined between said clamping jaw and said base jaw and being adapted to receive an exchangeable cutting insert, a displacement surface formed in said clamping jaw, said displacement surface being spaced apart from said insert receiving slot and located substantially on said clamping jaw leading portion, and a supporting surface provided on said body portion, said supporting surface being spaced apart from said displacement surface, the arrangement being such that a displacing force applied between the supporting and displacement surfaces to move said surfaces relative to each other results in a outwardly directed resilient pivotal displacement of said clamping jaw relative to said base jaw; b) an insert receiving slot opening key having a pair of spaced apart prongs, a first prong of said key adapted to engage said supporting surface and a second prong of said key adapted to engage said displacement surface for applying said displacing force; and c) means to force apart said first and second prongs, said means including a wedge-like spacer.