US135812A - Improvement in combined millstone trams and levels - Google Patents

Description

UNITED STATEs PATENT OFFICE.

JOHN HUIOHINS', `OF PORTSMOUTH, OHIO.

IMPROVEMENT IN COMBINED MILLSTONE TRMS AND LEVELS.

Specification forming part of Letters Patent No. l3512, dated February 11, 1873.

.To all whom it may concertar Be it known that I, JOHN HUTcHINs, of Portsmouth, in the county of Scioto and State of Ohio, have invented a new and Improved Millstone Tram and Level; and I do hereby declare the following to be a full, clear, and exact description of thesame, reference being had to the accompanyingdrawing forming part of this specification, in which- Figure l is a side elevation of my invention as applied to a millstone and spindle, and Fig. 2 is a top view of the apparatus.

Similar letters of reference in the accom panying drawing indicate the same parts.

This invention relates to that class of devices used -for tramming or plumbing millstone-spindles; and has for its object to improve the construction of' these devices in such manner that, first, the instrument may also serve to level the stone; second, the instrument may be readily and securely attached to the spindle 5 and third, the instrument may be adapted to stones of different diameters. To this end the invention consists, iirst, in the combination of a millstonc-tram with an adjustable spirit-level, second, in the construction of a millstone-tram with an eye for receiving the spindle, provided with screws for attaching the eye to the spindle; and in combination with an adjustable level, so that by the rotation of the spindle the latter may be plumbed and the stone leveled by the same operation, as hereinafter more Vfully `set forth all which I will now proceed to describe.

In the drawing, A is the tram, a bar of wood or metal, of a length equal to about half the diameter of a millstone. At one end the traml is constructed with an eye, B, of a size to receive the spindle C,which eye is provided with screws D that can be made to readily and securely fasten it to the spindle.

The old method of fastening the tram to the spindle is that by means of wedges, which, besides being troublesome, do not hold the tram firmly in place. My improvement entirely obviates this difficulty.

The ordinary way of plumbing a spindle requires that the stone should first be .truly leveled, then by sweeping the tram vv.with a vertical quill in its outer end over the surface of the stone the spindle is plumbed. Toimprove upon this method, I combine the'spiritlevel with the tram, instead of using them separately.

The level E is of ordinary construction, except in respect of trunnions e at the sides,

and a projection, c', at one end. By means of the trunnions the level is pivoted to and between lugs a, springing from a plate, b, which has a threaded stem extending through the tram A, and is attached thereto by means of a nut, F, screwed upon said stem. A setscrew, G, passes through the projection e and is stepped in a recess in the upper side of the tram. By means of the screw Gthe outer end oi' the level can be raised or lowered, so that, whether the tram slant up or down with reference to the spindle, it can be plumbed andthe stone leveled at the same time, the bubble being the guide in both processes. It is therefore unnecessary, when this instrument is to be used, to level the stone beforehand. My quill c is a metal spur set in a tapped head,'d, which screws upon the lower end ot a threaded stem, h., that passes through a tapped collar placed in a longitudinal slot, 7.1, at the outer end of the tram A. The collar has a head, l, which rests ou the top of the tram, and, with its inclosed stem 71 can be slid to any part of the slot lr. /It can be fastened to any point of the slot by means of aV nut, m., also inclosing the stem and a washer, Hence, by means of the threaded stem and tapped collar, the quill can be, in effect, lengthened or shortened, to suit the height of the outer end of the tram from the stone and, by means of they sliding collar and fastening-nut, the quill can be set in as many diiferent positions as the slot 7c gives room for, and thus adapt the ,instrument to stones of di'erent diameters.

I do not claim, broadly, a spirit-level combined with a tram; nor do I desire to claim a millstone-tram having an eye on its end, and fastened to the spindle by a screw; but

What I do claim as new isl. A millstone-tram and adjustable level combined, substantially as described.

2. A millston'e-tram having an eye to receive the spindle provided with screws to fasten the eye to the spindle, in combination with an adjustable level, so that by the rotation of the spindle it can be plumbed and the stone leveled at the same time, substantially as described. Y

3. The combination of the Aslotted tram A,

threaded stem h, tapped collar l, nut m, and

quill c, all arranged as specied.

JOHN HUTGHINS.

Witnesses:

C. C. FULTON, W. B. Garon.

Images