US1410851A - Ball machine - Google Patents

Description

R. GREY.

BALL MACHINE. APPLICATION FILED FEB. 25, 1920. RENEWED on. s, 1921.-

1,410,85 1. Patented 28, 1922.

a 2 SHEETS-SHEET l- INVENTOR.

R. GREY.

BALL MACHINE.

APPLICATION FILED FEB. 25, 1920. RENEWED OCT- 6,192!- I Patented Mar. 28, 1922.

2 SHEETS-SHEET 2.

UNITED STATES PATENT orricn.

ROBERT GREY, OF. SAN FRANCISCO, CALIFORNIA, ASSIGN OR TO NATIONAL -COMPANY, ACORPORATION OF CALIFORNIA.

BALL Macrame.

Z '0 all whom it may concern Be it known that I, ROBERT GREY, a citizen of the United States, residing at San Francisco, in the county of San Francisco, State of California, have invented a new and useful Ball Machine, of which the following is a specification in such full and clear terms as will enable those skilled in the art to construct and use the same.

This invention relates to a ball mill, and its object is to produce an easily constructed mill which is extremely effective and which requires the minimum of machine work to produce.

Another object of the invention is to produce a mill which will have an extremely simple driving mechanism, a belt being applied to the mill directly and which driving mechanism is normally held in a central position by means of suitable rods and springs which enable balls and driving pulley to shift and raise as ma be necessary due to obstructions over w ich the balls may pass without interference to the operation of the mill.

Another object of the invention is to so shape the grinding pan as to give it the maximum wearing capacity in the general direction. in which the balls tend to move, as the pan wears on account of the rinding.

Other objects of the invention wi 1 appear as the description proceeds.

An embodiment of the invention is shown in the drawings in which the same reference number is used throughout, but I am aware that there may be modifications thereof.

Fig. 1 is a view in side elevation of the machine, one half being shown in vertical section.

Fig. 2 is a plan view of the machine one portion thereof being broken away.

The mill is mounted upon a suitable concrete base 1 in which there is an imbedded center shaft 2, having a horizontally extending pin 3 to assist in holding it properly positioned. .Mounted upon the base 1, which base is surrounded by suitable timbers 4, is a mill pan 5; this pan is curved in vertical section and forms a suitable annulus in which the renewable grinding pan 6 is placed.

Resting upon the grinding pan 6 are plurality of balls 7 and resting upon the balls is a curved ring 8, said ring having an upwardly extending flange 9 for securing it Specification of Letters Patent. I Patnted l\Ia1,28-, 1922.

0ctober6, 1921. Sean No. 565,923.

to the pulley ring 10 bolts 11 being used for this purpose. The pulley ring has a plural- FINANCE ity of inwardly extending lugs 12, each of V which receives a rod 13, and the rods 13 are in turn each connected by means of a short link 14 and two pins 15 and 16, with a cap 17 on the top of the shaft 2. I

On the outer end of each of the rods 13 there is a nut 18 which bears upon the spiral spring 19, there being one spring for each of the rods. The rod 13 passes through a cylinder 20 which forms a receptacle in which the ore being ground is fed. This cylinder has an inwardly turned edge 21 at its bottom, to discharge the ore against the feed cone 22, which also rests upon the inner edge of the mill pan 5. At intervals around the mill pan there are posts 23, secured thereto by means of bolts 24-25, there being four bolts for each post, these posts flare outwardly and turn to the vertical at their upper portion, as indicated at 26 to support a sheet metal ring 27 which extends around the mill to prevent the splash from getting over the screens 28. The screens are held in place by means of suitable wedges 29 and blocks 30, carried by posts 23.

In operation the ore to be broken is dropped into the cylinder 20 and slides down to cone 22 to the grinding pan 6. The inner edge of the grinding pan is shaped to befree of the grinding balls 7 when the die is new,

as indicated at 31. As the die wears the arc of contact of the balls therewith becomes greater and the die may be used until the ball is worn through it far enough to touch the upper edge of the inner portion of the pan 5, whereupon the new die must be placed in position to prevent injury to the mill itself. It will also be noticed that the outer edge of the pan is higher than the inner edge, this being for the purpose of causing the die to wear down evenly. Its height being determined in accordance with the speed of the mill desired, that is, with a high speed mill, the pan would have to be higher than with a low speed mill.

What I claim is as follows, but various modifications may be made in the construction shown in the drawings and above particularly described form, within the purview of my invention:

1. A ball grinding mill comprising the combination of a grinding an having a renewable ring therein, balls t ereon, a ring resting upon said balls, a pulley ring connected therewith, and resilient means for holding said pulleyring central with respect to the axis of the pan.

2. A ball grinding mill comprising the combination of a pan having a renewable" wearing ring, balls thereon, a pulley ring for driving saidballs by friction, a-vertically.

extending center shaft, 2, cap slideble thereon, universal joints connecting outwardly 10 extending radial rods thereto, and springs connecting. theipulley. ring. and said rods for V holdingthepul'ley ring centrally positioned.

In testimony whereof I have hereunto set my handthis' 17th day of February A. D. 15

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