Implement and power steering pump

Claim 1

A PUMP COMPRISING A CASING HAVING A RECESS IN ONE WALL FORMING A PUMPING CHAMBER, A COVER ENGAGING SAID ONE WALL AND HAVING RECESS MEANS FORMED THEREIN FOR RECEIVING A SEAL PACK AXIALLY OPPOSITE SAID PUMPING CHAMBER, FASTENING MEANS INTERCONNECTING SAID CASING AND SAID COVER OUTWARDLY OF SAID PUMPING CHAMBER AND SAID RECESS MEANS, AND A SEAL PACK IN SAID RECESS MEANS COMPRISING A PRESSURE PLATE HAVING OUTER MARGINAL PORTIONS OVERLAPPING THE EDGES OF SAID PUMPING CHAMBER AND ENGAGING AGAINST SAID ONE WALL OF SAID CASING, SAID PRESSURE PLATE INCLUDING INNER SEALING PORTIONS FOR ENGAGING AND SEALING AGAINST THE ADJOINING SIDE FACE OF ROTARY FLUID DISPLACEMENT MEANS IN THE PUMPING CHAMBER, SAID RECESS MEANS INCLUDING AN IRREGULARLY SHAPED RECESS HAVING A GENERALLY OVALOIDAL CONTINUOUS OUTER CHANNEL, A PAIR OF SUBSTANTIALLY CIRCULAR INNER CHANNELS, A FIRST AND SECOND CROSS CHANNEL EXTENDING BETWEEN EACH SAID INNER AND OUTER CHANNELS AND DISPOSED AT AN ANGLE WITH RESPECT TO EACH INNER CHANNEL ON THE INLET SIDE OF THE PUMP, A THIRD CROSS CHANNEL BETWEEN SAID INNER CHANNELS AND A FOURTH CROSS CHANNEL BETWEEN SAID THIRD CHANNEL AND SAID OUTER CHANNEL, A SIMILARLY IRREGULARLY SHAPED BACKING MEANS IN SAID CHANNELS, AND A SIMILARLY IRREGULARLY SHAPED SEALING WEB OF GENERALLY J-SHAPED CROSS-SECTION IN SAID CHANNELS BEHIND SAID BACKING MEANS, SAID SEALING WEB HAVING AN OUTER LONG LEG AND AN INNER SHORT LEG, EACH OF SAID LEGS HAVING PORTIONS ENGAGING AND SEALING AGANIST THE WALL PORTIONS OF SAID COVER MEMBER