Ram couling and cylinder end seal assembly for high pressure cylinder

Claim 1

A coupling and seal assembly, for use in a high-pressure, liquid intensifier, or the like, comprising: a cylinder; means at one end of said cylinder for admitting pressurized liquid into said cylinder; a plunger; a ram; means, engaging both said ram and a first end of said plunger, removably coupling said ram to said first end of said plunger; and apertured means, in the other end of said cylinder, (a) slidably receiving said plunger therewithin, and (b) centering said plunger in said cylinder; wherein said receiving and centering means includes means for sealing said cylinder against leakage of liquid therefrom via said other end thereof; and further including means securing said receiving and centering means in said cylinder against removal thereof via said other end; said securing means being but a singal retaining ring; wherein said sealing means comprises an annular seal sealingly engaged with a second end of said plunger and with said cylinder; said receiving and centering means further includes an annular seal seat (a) receiving said seal thereagainst, and (b) set about said second end of said plunger; said receiving and centering means also includes keying means set in said cylinder, receiving said seal seat thereagainst, and obstructing removal of said seal seat and seal via said other end of said cylinder; said receiving and centering means further includes annular means, for positioning said keying means, set about said second end of said plunger; said annular, positioning means has a circumferential land; said keying means is slidably engaged with said land and is concentric with said annular, positioning means; said annular, positioning means comprises a sleeve having an outwardly-extending flange; said cylinder has an annular, recessed shoulder formed in said other end thereof; and said flange of said positioning means is set against said shoulder.