Locking bolt for mounting a tool on a hydraulic press

An assembly comprising:

• a press capable of being actuated hydraulically, electrically or by hand, said press being capable of having a pressing or cutting tool mounted therein, said press having a receiving neck including a pair of legs and a bolt receptacle passing through each said leg;
• a locking bolt mounted in said bolt receptacles, said locking bolt having a head and a shank extending therefrom, a securing recess provided in said shank, said securing recess having a predetermined depth, a longitudinal groove provided in said shank, said longitudinal groove having a predetermined depth, said predetermined depth of said securing recess being at least equal to said predetermined depth of said longitudinal groove, a blocking surface separating said longitudinal groove from said securing recess, the securing recess being adjacent to and directly transitioning into the longitudinal groove in a circumferential direction,
• a securing element captivity positioned between said locking bolt and one of said legs, said securing element being held captive on said press by constant engagement with one of said longitudinal groove and said securing recess, said locking bolt being moveable within said bolt receptacle between a locking position and a release position, said securing recess securing said locking bolt in the locking position by positive engagement with said securing portion;
• a spring positioned between one of said legs and said head of said locking bolt to bias said locking bolt into the release position when said spring is an expanded state.