BULLOCK’ MILL BUSH.

Patented December 31, 1867.

Fig. 1

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.

All experienced millers are aware that the attainment of the above objects by a simple device is a very desirable achievement. By the use of this improvement the adjustment can be readily and accurately made, and the wear of the spindle is reduced to a minimum.

We can fit any size spindle from 3½ to 5 inches diameter, and have three sizes of bushes, 7½, 8½ and 9½ inches square. In ordering bushes, all that is necessary is to state the diameter of neck of spindle and size of eye in bed stone, and the proper size bush will be shipped. Satisfaction guaranteed.

We have some half dozen different patterns of bushes ranging in price from $2 to $20—some having three and some four followers for wood or metal.

Lighter Screws and Hand Wheels.

These engravings illustrate the style of hand wheel and screw with cap and washer that we make and furnish with our combined husk mills, and when ordered we send them with the irons needed with mill stones. The figure on the right shows the hand wheel, screw cap and washer in position when ready for operation. The wrought iron screw is cut in a lathe and is what is termed a square thread. The wheel cap and washer are all turned and polished, making a good looking, durable fixture, as well as an accurate means of adjusting the stone. We sometimes make these of brass.