US1005738A - Sand-mill. - Google Patents

Description

G. MOWRY.

SAND MILL. APPLICATION FILED MAR. 18. 1910.

1,005,738. 1 Patented 001;. 1o, 1911.

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G. MOWRY.

SANDMILL;

APPLIoATmN FILED MAR. 1s. 1910.

Patented Oct. 10, 1911.

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GEORGE MOWRY, OF DERBY, PENNSYLVANIA.

SAND-MILL.

Speccation of Letters Patent.

Patented 0ct. 10, 1911.

Application filed March 18, 1910. Serial No. 550,140.

To all whom it may concarnf Be it lmown that I, GEORGE MowRY, a citizen of the United States, residing at Derry, in the county of Westmoreland and State of Pennsylvania, have invented new and useful Improvements in Sand-Mills, of which the following is a specification.

The invention relates to an improvement tions being so formed `as to permit the use of the weights at the most eEective point without interfering with the usual operation of the mill.

rEhe invention in its preferred details of construction will be described in the following specification, reference being had particularly to the accompanying drawings, in which Figure 1 is a vertical, sectional view showing a sand mill of ordinary type provided with my improved weights. Fig. 2 is a section through the weight sections. Fig. 3 is a vertical section through the lowermost weight section. Fig. 4 is a similar view taken at right angles to Fig. 3. Fig. 5 is a vertical section through a mill taken at right angles to the line of section of Fig. 1. Fig. 6 is a plan of the mill, the upright shaft being in section and the parts above the weight omitted.

Referring particularly to the accompanying drawings, I shall rst describe the specific details of the mill, wishing it to be understood that such is a commercial type of mill and is designed for the conventional representation of any preferred type.

As will be understood, the mill is designed for grinding rock and the like delivered thereto into fine sand particles and in its essential details of construction comprises a frame structure 1 in which is supported a pan 2 having an inlet and an outlet through the former of which the rock or similar material is delivered preferably by a stream Aof water from a pressure and from the latter of which a different material is delivered by the current. Mounted in the bearings in the bottom of the frame and extending vertically therefrom is a drive shaft 3 which, at a point above the pan, is formed with an enlarged rectangular section 4 above which section the shaft is gradually tapered and provided on its upper end with a gear to mesh with a gear mounted on an operating shaft, whereby a rotary movement is imparted to the drive shaft. The rectangular section 4 of the drive shaft is formed with an elongated centrally disposed channel 5 in which is mounted a casting 6, preferably rectangular so as to be guided in movement by the walls of the channel. The

casting extends beyond the walls of the section 4 of the guide shaft for a short distance in its rectangular form, as at 7 then is reduced in dimensions and rounded, as at 8. A wheel shaft or axle, as 9, extends through a bore 10 in the casting, and beyond the sec tion 4 of the drive shaft said axle receives the boxes of the crushing wheels 11. These wheels operate in the pan 2 traveling in a circular path therein under the revolution of the drive shaft, as will be obvious. In order to accommodate the wheels to the different quantities of material which will lodge in the pan at different stages of the` crushing operation said axle must be capable of an independent vertical movement. This is permitted by securing a pin 12 through the casting and axle with its projecting terminals guided in vertically disposed elongated slots 13 formed in the walls of the section 4 of the drive shaft.

The above illustrates a simple type of sand mill which has been found commercially practical and, as previously stated, is intended to represent any specific construction desired for vthis type of machine.

In practice each crushing wheel is provided with a steel tire which, on account of the wear, must be frequently renewed and, as will be obvious, the wear of the tire from its original condition to the condition at which renewal is necessary will tend to a gradual reduction in the output of the mill from a gradual lessening of the crushing effect.

It is the object of the present invention to arrange for the mill a series of weight sections which may be added thereto as desired, thereby compensating for the wear of the tire and maintain and increase the crushing power practically identical with that of the mill in its original condition until the tire has been completely worn. The improvement will therefore permit a much longer use of the mill without the renewal of the tires while at the same time insuring an output at all times equal to the output of the mill in its original condition. The weights must be particularly designed to permit their application to the mill structure without dismantling` any of the parts and without interfering with the necessary independent vertical movement of the crushing wheels. The lowermost or main weight is in the form of a disk 14 divided diametrically into two sections 15 and 16. For the purpose of description it will be treated as a solid member, being formed in the sections to permit it to be applied to encircle the drive shaft without disconnection of any of the parts of the mill. The main weight disk is centrally providedwit-h a rectangular opening 17 having longitudinal and transverse dimensions slightly exceeding the similar dimensions of the section 4 of the drive shaft, and on the bottom surface depending from and in alinement with the end walls of the opening 17 overlying the projecting portion 7 is formed with a depending web 18 centrally formed at 19 to engage the rounded portion 8 of the casting, the engaging wall of the portion 18 conforming to the casting at the juncture of the rectangular and rounded port-ions and partly overlying each, whereby the main weightk member is supported on the casting in a manner to secure its stability in normal horizontal position. The remaining weight members 2O are of disk formation each divided into sections. Certain of the members superimposed with the main member being centrally formed with openings 21 of a size to permit the passage of the rectangular section 4 of the drive shaft therethrough, the remaining members being formed with openings 22 to receive and permit the passage of the reduced portions of the drive shaft therethrough. Preferably the opening thus formed in the weight, considering the members as an entirety, is of gradually increasing diameter from the casting upwardly in that portion of the weight formed to compensate for the movement of the rectangular portion of the drive shaft, the remaining lengths of the opening being practically of uniform diam.- eter or of slightly decreasing diameter in the upward direction. The respective sections of the weight members are secured together by tie rods 23 passing through openings formed in each two adjacent sections, the oints between the sections of one member and the sections of the next lowermost or uppermost member being arranged in the usual breakjoint or offset relation so that when any one section is secured upon the underlying section a practically integral circular weight is provided. lt will be further noted that the main weight section is, by means of the projections engaging a casting, so supported that its lower surface beyond the projection is arranged above and in spaced relation to the boxes of the crushing wheels, as at 25, thereby avoiding interference at this point and permitting the usual oiling and other attention necessary to secure the proper lubrication of the wheel.

In the use of the improvement, the main section and additional sections are gradually added as the tire of the crushing wheels wear in order to compensate for the crushing effect of the wheels lost through the wear of the tires. By this means the crushing weight is increased irrespective of the wear of the tires, and the output of the machine increased under all conditions. By' the sectional formation of the weights they will be quickly secured in place when disconnecting or disarranging any of the parts of the machine, it being contemplated of course that any number of weights can be supplied and that the individual members may be of any weight desired.

Having thus described the invention, what I claim as new, is

1. The combination with a sand mill including a drive shaft, an axle mounted for independent vertical movement with relation to said shaft, wheels on said axle of a weight arranged to encircle the drive shaft and exert pressure on the wheels, said weight being formed with an opening having a diameter exceeding that of the drive shaft to permit the independent vertical movement of the wheels with relation to said shaft, and means for supporting said weight wholly free from contact with the wheels.

2. The combination with a sand mill including a drive shaft, a casting to move vertically in and with relation to said shaft, i

an axle supported in said casting, wheels on said axle, of a weight encircling the drive shaft and bearing on and movable with the casting, and means carried by the weight to engage the casting to support said weight wholly free from contact with the wheels.

3. The combination with a sand mill including a drive shaft, a casting to move vertically in and with relation to said shaft, an axle extending through the casting, drive wheels supported on said axle, of a weight encircling the drive shaft and bearing on and movable with the casting, said weight including a main section formed with an opening to encircle the drive shaft and with a depending projection formed member upon and encircling the casting.

4. The combination with a sand mill including a drive shaft, a casting 'to move Sil vertically in and with relation to said shaft, an axle extending through the casting, drive wheels supported on said axle, of a weight encircling the drive shaft and bearing on and movable with the casting, and means carried by the weight and engaging the casting and supporting the weight wholly free from contact with the wheels, said weight including a series of members made up of independent sections, and means for connecting the sections of one member to the sections of the next lowermost section.

5. A weight for use with sand mills and the like including a series of independent members each constructed of a plurality of sections, and means for connecting the respective sections of one member to the sections of the adjacent member in break-joint relation, the lowermost member being formed with a depending projection having a centrally cut-out engaging portion, the respective members being formed with a center opening to provide a shaft receiving opening when the members are assembled.

6. In a crushing mill, a grinding pan, a vertical shaft disposed centrally of the grinding pan, bearings for the upper and lower ends of the shaft, a channeled box formed on the shaft between its ends, said box being provided with vertically disposed Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

slots and having parallel walls, a casting slidable in the box and engaging the walls thereof, a shaft extending through the casting and box and having its opposite ends disposed on either side thereof, a pin extending through the second shaft and the casting and slidable in the vertical slots of the box, a weight secured around the upper end of the first shaft and slidably engaging the box of said shaft and having a bearing at its lower end on the second shaft, and grinding rollers mounted on the ends of the second shaft and operating in the grinding pan.

7. In a grinding mill, a vertical drive shaft journaled at its ends, a channel box formed on the shaft between its ends, a casting slidable inthe box, an axle extending through the casting, grinding wheels journaled on the axle and movable in the grinding pan, and a weight mounted on the axle and supported out of contact with the drive shaft.

In testimony whereof I afix my signature in presence of two witnesses.

GEORGE MOWRY.

Witnesses:

J. R. CAMPBELL, PHILIP MowRY.

Washington, D. C.

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