Booster-type servomotor for brake systems

Claim 1

A FLUID PRESSURE ACTUATED MOTOR COMPRISING: A CASING AND A PRESSURE-RESPONSIVE UNIT MOVABLE THEREIN FROM A NORMALLY RELEASE POSITION; AN OPERATOR-OPERATED MEMBER HAVING A NORMALLY RELEASED POSITION; A MOVABLE MEMBER MOUNTED ON SAID PRESSURE-RESPONSIVE UNIT COAXIALLY THEREWITH; FOLLOW-UP CONTROL VALVE MECHANISM HAVING A MOVABLE PORTION MOUNTED ON THE MOTOR CASING, AND ANOTHER PORTION OPERATIVELY ASSOCIATED WITH THE PRESSURE-RESPONSIVE UNIT TO MOVE AS A UNIT THEREWITH, SAID VALVE MECHANISM HAVING A NORMAL "OF" POSITION BALANCING PRESSURE IN SAID MOTOR AND BEING MOVABLE RELATIVELY FROM SUCH "OFF" POSITION TO ESTABLISH DIFFERENTIAL PRESSURES IN SAID MOTOR; NORMALLY SPACED ENGAGEABLE PORTIONS MOUNTED RESPECTIVELY ON THE PRESSURE-RESPONSIVE UNIT AND SAID VALVE PORTIONS FOR DEFINING THE LIMITS OF RELATIVE OPERATING MOVEMENT OF THE LATTER; THE IMPROVEMENT WHICH COMPRISES: A WORK-PERFORMING ELEMENT ACTED ON IN PART BY SAID PRESSURE-RESPONSIVE UNIT; A REACTION AND FORCE-TRANSMITTING DEVICE INCLUDING A NORMALLY RELAXED RESILIENT MEMBER HAVING LEVER-ACTION OPERABLY DISPOSED BETWEEN SAID WORK ELEMENT AND PRESSURE-RESPONSIVE UNIT IN ENGAGEMENT WITH SAID MOVABLE MEMBER; MECHANICAL MEANS FOR TRANSMITTING FORCE FROM SAID OPERATOR MEMBER TO MOVE SAID MOVABLE MEMBER TO INAUGURATE TENSION IN SAID RESILIENT MEMBER BY DEFORMING IT PRIOR TO ENERGIZATION OF SAID MOTOR WHEREBY THE LATTER WHEN ENERGIZED CAUSES THE REACTION FROM SAID WORK ELEMENT TO BE TRANSMITTED THROUGH SAID RESILIENT MEMBER UNDER INCREASING TENSION ON THE OPERATOR MEMBER WHILE THE PRESSURE-RESPONSIVE UNIT OPERATES THROUGH A PREDETERMINED POWER RANGE DEFINED BY MINUTE SEPARATION OF THE WORK ELEMENT AND PRESSURE-RESPONSIVE UNIT INDUCED WHEN PLACING SAID RESILIENT MEMBER UNDER TENSION AS AFORESAID; A LINK FOR TRANSMITTING FORCE FROM SAID OPERATOR MEMBER TO MOVE ONE OF THE VALVE PORTIONS RELATIVELY WITH RESPECT TO THE OTHER PORTION FROM "OFF" POSITION; AND A NORMALLY PRELOADED SPRING OPERABLY REACTING BETWEEN SAID VALVE PORTIONS FOR BIASING THEM APART AND ACCOMMODATING THEIR MOVEMENT TOWARD EACH OTHER FROM "OFF" POSITION UNDER INFLUENCE OF SAID OPERATOR MEMBER OPERATED FROM RELEASED POSITION.