Double detent holding means for electric shaver head unit

Claim 1

IN AN ELECTRIC SHAVER INCLUDING A CASE HAVING AN OPEN-TOPPED, HEAD-RECEIVING RECESS AT ONE END, THE SAID RECESS BOUNDED BY A FLOOR PORTION, SIDE WALLS AND AT LEAST ONE END WALL, THE COMBINATION OF A LEAF SPRING UPSTANDING IN THE RECESS ADJACENT EACH SIDE WALL, THE UPPER END OF EACH SPRING INCORPORATING UPPER AND LOWER DETENT NOTCHES, A SHEARING HEAD UNIT INCLUDING A BASE HAVING A LOCKING ELEMENT ON EACH SIDE THEREOF ADAPTED FOR SNAPENGAGEMENT SUCCESSIVELY WITH THE UPPER AND LOWER DETENT NOTCHES WHEN THE HEAD UNIT IS PRESSED INTO THE RECESS, A WEDGE SEATED ON THE RECESS FLOOR PORTION ADJACENT SAID END WALL WITH ITS THIN END DISPOSED BENEATH THE HEAD UNIT BASE, THE WEDGE BEING MOVABLE LONGITUDINALLY OF THE RECESS TO RAISE THE HEAD UNIT AND ADAPTED TO RAISE THE SAME ONLY TO AN EXTENT SUCH AS TO CAUSE THE LOCKING ELEMENTS TO BE TRANSFERRED FROM THE LOWER TO THE UPPER DETENT NOTCHES, THE WEDGE HAVING A SHANK PORTION PASSING THROUGH SAID END WALL AND AN OPERATING BUTTON ON THE OUTER END OF THE WEDGE SHANK FOR EFFECTING SAID LONGITUDINAL MOVEMENT OF THE WEDGE.