Roller detent mechanism for control apparatus

Claim 1

A DETENT MECHANISM FOR CONTROL APPARATUS COMPRISING, A SUPPORT, A SHIFTABLE ELEMENT SLIDABLE WITH RESPECT TO SAID SUPPORT, A SPRING FINGER SUPPORTED IN CANTILEVER FASHION BY SAID SUPPORT HAVING AN ABUTMENT SECTION LOCATED INTERMEDIATE ITS ENDS, SAID SHIFTABLE ELEMENT HAVING A RECESS DEFINED BY SPACED WALL MEANS, A LATERALLY EXTENDING ROLLER LOCATED IN SAID RECESS ENGAGING ONE FACE OF SAID SPRING FINGER, SAID ROLLER ENGAGING A WALL OF SAID RECESS WHEREBY IT IS HELD AGAINST SAID SPRING FINGER BY SAID SHIFTABLE ELEMENT, SAID SPRING FINGER EXTENDING ACROSS THE PATH OF MOVEMENT OF SAID ROLLER, ONE OF SAID WALL MEANS FORCING SAID ROLLER INTO ENGAGEMENT WITH AND PAST SAID ABUTMENT SECTION OF SAID SPRING FINGER WHEN SAID SHIFTABLE ELEMENT IS MOVED IN ONE DIRECTION AND THE OTHER OF SAID WALL MEANS SHIFTING SAID ROLLER IN AN OPPOSITE DIRECTION OVER SAID FACE OF SAID SPRING FINGER WHEN SAID SHIFTABLE ELEMENT IS MOVED IN AN OPPOSITE DIRECTION, SAID SPRING FINGER APPLYING A REACTIVE FORCE TO SAID SHIFTABLE ELEMENT THROUGH SAID ROLLER WHEN IT ENGAGES SAID ABUTMENT SECTION, SAID SPRING FINGER BEING BENT AWAY FROM SAID CONTROL ELEMENT TO REDUCE SAID REACTIVE FORCE WHEN SAID ROLLER IS SHIFTED PAST SAID ABUTMENT SECTION, SAID WALL MEANS BEING SPACED FROM EACH OTHER A DISTANCE GREATER THAN THE DIAMETER OF SAID ROLLER WHEREBY SAID ROLLER CAN ROLL BETWEEN SAID SHIFTABLE ELEMENT AND SAID FACE OF SAID SPRING FINGER.