Piston pump for conveying concrete mixes

Claim 1

A piston pump for conveying concrete or the like, comprising pump frame means including base means, cylinder head means and guide tie rod means rigidly connecting said base means and said cylinder head means to form said frame means, whereby said base means and said cylinder head means are held at a fixed spacing from each other, piston cylinder drive means operatively secured to said cylinder head means on one side thereof, scavenging chamber means, guide bushing means (9) forming part of said scavenging chamber means for slidably securing said scavenging chamber means to said guide tie rod means in said frame means, centering socket means in said scavenging chamber means and in said base means, conveying cylinder means operatively held in said centering socket means and positioned in said frame means in axial alignment with said piston cylinder drive means and with said scavenging chamber means, adjustable securing means including a threaded section (20) on each of said tie rod means between said cylinder head means (2) and said guide bushing means (9) and nut means (7) on each of said threaded sections (20) for fixing the position of said scavenging chamber means and simultaneously of said conveying cylinder means in said frame means by tightening said nut means, and wherein, solely upon loosening of said nut means with said rigid connection of said guide tie rod means to said base means and said cylinder means maintaining said fixed spacing, the guide bushing means and scavenging chamber means are movable so that the axial spacing between said socket means is increased to an extent longer than the axial length of said conveying cylinder means, whereby said conveying cylinder means may be mounted in or disassembled from said frame means without the need for disassembling the entire frame means and without the removal of said scavenging chamber means.