Shaft rotational velocity and direction indicating means utilizing a pulse producingand blocking commutator

Claim 1

ROTATABLE SHAFT ROTATION MEASURING MEANS COMPRISING COMMUTATING BAR MEANS FIXED TO SAID ROTATABLE SHAFT, AT LEAST A PAIR OF BRUSHES POSITIONED ADJACNET SAID ROTATABLE SHAFT, MEANS FOR CONNECTING SAID COMMUTATING BAR MEANS TO A FIRST REFERENCE POTENTIAL, MEANS FOR CONNECTING A FIRST OF SAID BRUSHES TO A SECOND REFERENCE POTENTIAL, IMPEDANCE LOAD MEANS HAVINGA FIRST TERMINAL CONNECTED TO THE SECOND OF SAID BRUSHES AND A SECOND TERMINAL CONNECTED TO SAID FIRST REFERENCE POTENTIAL, CAPACITOR MEANS CONNECTED BETWEEN SAID FIRST AND SECOND BRUSHES, SAID FIRST AND SECOND BRUSHES BEING ANGULARLY POSITIONED WITH RESPECT TO SAID COMMUTATOR BAR MEANS TO CAUSE, IN CONTINUOUS TIME SEQUENCE, THE CONTACTING THE ONE ONLY OF SAID BRUSHES WITH SAID COMMUTATOR BAR MEANS, THE CONTACTING OF BOTH OF SAID BRUSHES WITH SAID COMMUTATING BAR MEANS, AND THE CONTACTING OF THE OTHER ONLY OF SAID BRUSHES WITH SAID COMMUTATOR BAR MEANS, SAID SECND BRUSH RESPONSIVE TO CONTACT WITH SAID COMMUTATOR BAR MEANS TO SUPPLY SAID FIRST REFERENCE POTENTIAL TO SAID FIRST TERMINAL OF SAID IMPEDANCE LOAD MEANS TO BLOCK ANY PULSES GENERATED AT SAID FIRST BRUSH FROM APPEARING ACROSS SAID IMPEDANCE LOAD MEANS, AND MEANS CONSTRUCTED TO DETECT THE NUMBER AND POLARITY OF PULSES APPEARING ACROSS SAID IMPEDANCE LOAD MEANS, THE NUMBER AND POLARITY OF SAID PULSES BEING REPRESENTATIVE OF THE AMOUNT AND THE DIRECTION OF ANGULAR ROTATION OF SAID ROTATABLE SHAFT.