6.
We shall now describe the mechanism for loosening the band, I, and
moving the bottom, K.
The band, I (Figs. 5 to 9), is cleft at a point in its circumference
corresponding to one of the joints of the shell, F, and carries at each
side of the cleft a bearing in which turns freely a steel pin. One
of these latter, i, is cylindrical, and the other, j, has eccentric
extremities that are connected with the former by two small iron rods,
k and l. The upper extremity of the pin, j, is provided with a bent
lever-handle, M, and the lower one carries in its turn a small disk, m,
the use of which will be explained further on. It results from such an
arrangement that by acting on the lever, M, with the band, and by reason
of the eccentricity of the pin, j, the two extremities of the band,
I, may be made to approach or recede at the will of the operator. The
position of nearest approximation is limited by the abutting of the hook
at the end of the lever, M, against the side of the filter. This latter
position corresponds to the moment of charging the apparatus (Fig. 6),
while the contrary one indicates the moment that the oil cake falls
(Fig. 4). Although the separation is but a few millimeters, it is
sufficient for disengaging and allowing the cake to drop.
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