The movable bottom, K (Figs. 5 and 6), which closes the base of the
filter during the pressing, becomes detached and drops vertically (Figs.
3 and 4), when the filter is disengaged from the press, and the oil cake
is to be dropped out. To render the maneuver of this part easy, the
bottom is provided with a projecting piece, N, united by a bolt with
the band, I, and furnished with an articulated hand-lever, N', that
terminates in an appendage, q. The upper part of the hinge is provided
with a tail piece, q', under which the appendage q, places itself when
the bottom, K, is brought to its horizontal position. Consequently, when
the operator desires to let the bottom drop in the position shown by the
dotted line (Fig. 5), after the filter has been loosened, he moves
the lever, N, to the position shown by the dotted line (Fig. 6). The
appendage, q, then disengages itself from the tail piece, q', and the
bottom is thus enabled to assume a vertical position. As the bottom at
the time of charging would not be sufficiently supported if there merely
existed the lever and catch, it is further provided at its opposite
extremity with an appendage, r, which slides over a catch, r'.
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