US2211824A - Crushing and grinding machine - Google Patents

Description

CRUSHING AND GRINDING MACHINE Filed April 16, 1958 VI INVENTOR. CA/PL R JOHNSON.

ATTORNEY.

Patented Aug. 20, 1940 UNETED srrs ii TENT FFECE Carl R. Johnson, Denver, 0010., assignor of fifty per cent to C. E. Cannon, Denver, Colo.

Application April 16, 1938, Serial No. 202,496

1 Claim.

This invention relates to'a crushing and grinding machine and has for its principal object the provision of a crushing and grinding device which will require but a minimum of power; which will grind the material to a uniform mesh with a minimum formation of fines and slimes; which will exert a combined grinding and impacting action upon the material to separate the crystalline structure thereof, to release the mineral values therefrom; and in which the wearing parts can be quickly, easily and economically removed and replaced.

Other objects and advantages reside in the detail construction of the invention, which is designed for simplicity, economy, and efficiency. These will become more apparent from the following description.

In the following detailed description of the invention reference is had to the accompanying drawing which forms a part hereof. Like numerals refer to like parts in all views of the drawing and throughout the description.

In the drawing:

Fig. 1 is a side view partially in section of one form of the improved grinder.

Fig. 2 is a cross section through the grinding wheel.

Fig. 3 illustrates the grinding ball as used in the invention form.

The invention employs two grinding wheels 28 and 29, each cast with a semi-cylindrical, peripheral groove 38. The wheels 28 and 29 are mounted on shafts 3! and 32, respectively, carried in bearings 33 from a frame work 34. 05 The wheels 28 and 29 are positioned in alignment with each other with the rims in close proximity. A single grinding ball 35 rests by gravity in the socket formed by the grooves Si] in the wheels. The radius of the ball 35 coincides with the radius of the groove 30 so that the ball will fit closely into the groove to engage it at all points.

In use, the wheel 28 is driven from any source of power in a direction toward the ball 35. The wheel 29 need not be driven unless desired. The material to be ground is fed into the top of the wheel 2% from a suitable chute 3ft which exerts an impacting and grinding action thereon to reduce it to the desired mesh.

It is conceivable that an additional grinding wheel could be added to the right of the idler wheel 29 and an additional ball placed between these wheels. This would double the capacity of the machine with the addition of a single wheel and ball.

In actual practice, this machine has been found to grind material to a very uniform mesh with the formation of a minimum of fine dustlike material. This is probably due to the fact that particles passing between the ball and the wheel raise the ball a uniform height throughout the line of the grinding face so that all material passing will be of a uniform size.

While a specific form of the improvement has been described and illustrated herein, it is desired to be understood that the same may be varied, within the scope of the appended claim, Without departing from the spirit of the invention.

Having thus described the invention, What is claimed and desired secured by Letters Patent is:

A crushing and grinding machine comprising: a pair of rotatably mounted grinding wheels lying in a common vertical plane; a substantially semi-circular outwardly facing groove extending around the periphery of each grinding wheel; a completely spherical ball supported by said two grinding wheels and resting by gravity in the two peripheral grooves of both wheels; means for feeding material to be ground between said spherical ball and one of said wheels; and means rotating one of said wheels so that rotative movement will be imparted to said ball, said ball being free to rotate in any direction.

CARL R1. JOHNSON.

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