Tool holders

Claim 1

In combination, a. a tool holder having an axially disposed female taper in one end thereof, b. a pair of oppositely disposed reciprocating locking pins each having a cam head extending radially outwardly from said tool holder and a locking head extendable axially into said tapered bore, c. spring means constantly urging said reciprocating locking pins radially outwardly, d. a cam lock ring turnable to an unlocked or locked position opposite compound locking cams formed therein mounted on said tool holder with the cam heads of said reciprocating locking pins disposed in said compound locking cams of said cam lock ring, e. each compound locking cam having a rapid-rise portion and a contiguous slow-rise portion, each said rapid-rise portion being so located that its deep end substantially freely overlies the cam head of one of said reciprocating locking pins when said cam lock rIng is turned to its unlocked position, f. a pair of fixed oppositely disposed locking pins extending through said tool holder near the bottom thereof, each presenting a central portion thereof exposed within the female taper in a plane below the plane occupied by said reciprocating locking pins, g. a pair of spring loaded axially inwardly urged pins carried by said cam lock ring located in a plane above said reciprocating locking pins and engaging said tool holder at a combined arcuate groove and contiguous seat formed therein, h. a cam lock retainer pin carried by said cam lock ring extending into a retainer groove formed in the outer periphery of said tool holder located to limit the manual or wrench turning of the cam lock ring to the extent required to perform its function, and i. a tool including a male tapered shank formed complementary to the female taper in said tool holder with axially disposed flat portions on each side thereof and having a pair of angularly disposed opposite locking cams formed at the base of said flat portions and extending partially around said tapered shank therefrom, j. the locking cams of said tool shank engaging the fixed locking pins of said tool holder to lock said tool in said tool holder when said tool shank is inserted in to the tool holder taper and turned a partial turn with respect to said tool holder, k. the said reciprocating locking pins engaging first the rapidrise portion of said compound cam when said locking ring is initially manually turned in its ''''lock'''' direction followed by said reciprocating locking pins engaging the contiguous slowrise portion of said compound cams responsive to additional wrench turning of said locking ring.