Plate assembly for filter press

DETAILED DESCRIPTION I claim: 1.
A filter-plate assembly comprising: a backing wall having an outwardly directed face and formed with an annular and elongated groove opening outward at the face, having confronting inner and outer flanks, and of a predetermined transverse width; a filter plate adjacent the wall and having an outer peripheral and annular frame set in the groove, having transversely oppositely directed inner and outer faces, and of a width substantially less than the width of the groove so as to define between one of the faces and the respective flank an outwardly open annular gap, and a generally planar central panel within the frame and having a back face turned toward and forming a compartment with the wall and a front face turned away from the wall and adapted to be overlain by a filter cloth; and a retaining bar set in the gap and braced transversely between the one face of the frame of the plate and the respective flank of the groove of the backing wall.
2.
The filter-plate assembly defined in claim 1 wherein the groove flanks converge outward.
3.
The filter-plate assembly defined in claim 2 wherein the frame inner and outer faces are parallel to the inner and outer flanks of the groove and the one face is spaced from the respective flank.
4.
The filter-plate assembly defined in claim 3 wherein the flank spaced from the one face is the outer flank.
5.
The filter-plate assembly defined in claim 3 wherein the retaining bar has a retaining formation engaging into the flank spaced from the one face.
6.
The filter-plate assembly defined in claim 1 wherein the groove has an outwardly directed floor extending between the groove flanks and the assembly further comprises a seal ring set in the groove floor and outwardly engaging the frame.
7.
The filter-plate assembly defined in claim 1 wherein the frame has an inwardly directed end face and the assembly further comprises a seal ring set in the end face and inwardly engaging the backing wall in the groove.
8.
The filter-plate assembly defined in claim 1 wherein the bar is discontinuous and forms an empty gap in the gap, the wall being formed with an outlet passage opening into the gap, whereby filtrate can be pumped from the passage