The object of the invention which is herewith illustrated, is to enable the spindles of mill-stones to be adjusted with perfect accuracy, and at the same time furnish bearings of anti-friction materials, which may be kept constantly and perfectly lubricated, and from which all extraneous dust or grit, calculated to aggravate friction, may be kept excluded.
Fig. 1 is a perspective view of this improvement, and Fig. 2 is a sectional view of the same, showing details of construction. A, Fig. 2, is the spindle, playing in segmental bearings B.
There are four of these, which, together, make up the entire bearing for the spindle. They are hollow, as shown in the engraving, and faced with anti-friction surfaces.
The outer sides of these segments are inclined, these surfaces resting against the inclined inner surfaces of the hollow binding wedges C. Through the lower part of these wedges pass hooked bolts, D, with thumb nuts at their lower ends, by turning which the wedges are forced upward, and the segments B being prevented from rising by the top plate E, are forced inward till their surfaces are brought in proper proximity to the spindle.
Fig. 2
It is evident that by raising and lowering these wedges, as circumstances require, the spindle can be adjusted with the greatest accuracy.
Lubrication is secured by placing a store of oil, in the chambers F, of the segmental bearings B, from which it is fed, as wanted, through the apertures G, to the bearing surfaces of the spindle and bush. Lastly, the exclusion of dust and grit is secured by forming a chamber H, upon the top plate of the bush, with an annular cap which shuts down over it, and encloses the spindle, in which chamber is placed packing yarn or other suitable material to intercept all extraneous material of this character.
The top plate is bolted down to the external portion of the bush, and the whole enclosed, as shown in Fig. 1.