The wharf, d, is here
situated high up the spindle, has the same sleeve as in the preceding
case, and runs round the bush, g, upon the ring, z. The friction plate
resting upon the wharf is joined to the collar, a, running out into a
cup shape, which is fixed to the spindle, which here has a hexagonal
form. In this case the collar gives with the spindle, which latter
has the necessary play in the long footstep; and as the collar and
friction-plate are one, it is brought back to its normal place by
centrifugal force.
A peculiar arrangement is shown in Fig. 4. Here the ring and traveler,
f, are placed as usual, but the spindle carries at the same time an
inverted flier, t. The spindle turns loosely in the footstep, e, the
oil chamber being carried up to the middle of its height. The wharf
is placed in the same position as in the previous case, having also
a sleeve running in the oil chamber, c, upon a steel ring, z. The
friction-plate a, on the top of the wharf carries the flier, and on its
upper surface is in contact with the inverted cup, a, which is attached
to the spindle by a pin or screw. In order to limit at will the lateral
motion of the spindle there is attached to the latter, between the
footstep and the collar, a split ring, i, which can be closed more
or less by a small set screw. The spindle is thus only held in the
perpendicular position by its own velocity, which will facilitate a
high degree of speed, through the entire absence of all friction in the
bearings, this vertical position being assisted by the friction motion
whenever the spindle has been drawn on one side.
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