Impulse tool

Claim 1

IN AN IMPULSE TOOL INCLUDING HOUSING MEANS HAVING AN ECCENTRIC INTERNAL CAVITY CONTAINING A PRESSURE-TRANSMITTING FLUID AND INTERNAL SPINDLE MEANS ROTATABLE RELATIVE TO SAID HOUSING MEANS, ONE OF SAID HOUSING AND SPINDLE MEANS BEING ADAPTED TO BE ROTATABLY DRIVE, AND SAID HOUSING MEANS AND SAID SPINDLE MEANS HAVING COOPERATING SEAL PORTIONS FOR GENERATING INTERMITTENT PRESSURE INCREASES IN A SEALED-OFF PORTION OF SAID FLUID IN RESPONSE TO ROTATION OF SAID ONE MEANS WHEREBY TO EFFECT ROTATION OF THE OTHER OF SAID HOUSING AND SPINDLE MEANS; THE IMPROVEMENT WHICH COMPRISES A PAIR OF SPACED WALLS DEFINING A RADIALLY EXTENDING SLOT IN SAID SPINDLE MEANS, A BLADE SLIDABLY DISPOSED IN SAID SLOT FOR ENGAGING THE INTERIOR OF SAID HOUSING MEANS, SAID BLADE HAVING A GENERALLY T-SHAPED CONFIGURATION COMPRISING AN INNER STEM PORTION RECEIVED IN SAID SLOT AND AN OUTER CROSS PORTION EXTENDING AXIALLY BEYOND EACH SIDE OF SAID STEM PORTION AND ENGAGING SAID HOUSING MEANS, THE WIDTH OF SAID SLOT BETWEEN SAID WALLS BEING SUBSTANTIALLY GREATER THAN THE THICKNESS OF SAID BLADE WHEREBY TO PERMIT LIMITED COCKING OF THE BLADE IN THE SLOT, THE INCREASED FLUID PRESSURE IN SAID SEALED-OFF PORTION OF SAID FLUID MAINTAINING SAID CROSS PORTION AT ONE SIDE OF THE COCKED BLADE IN SEALED CONTACT WITH THE EDGE OF ONE WALL OF SAID SLOT, AND FLUID PASSAGE MEANS INCLUDING THE CLEARANCE BETWEEN THE OPPOSITE SIDE OF THE COCKED BLADE AND THE OPPOSITE WALL OF THE SLOT FOR APPLYING THE INCREASED FLUID PRESSURE TO THE INSIDE OF SAID CROSS PORTION FOR URGING THE BLADE OUTWARDLY INTO SEALING RELATION WITH SAID HOUSING MEANS.