US1214506A - Shaker-screen. - Google Patents

Description

W. BRASACK.

SHAKER SCREEN.

APPLICATION FILED APR. 3, 1916.

.1 ,2 14,596 Patented Feb. '6, 1917.

FIG.

wnzmam BRASACK, or rammon'r, WEST VIRGINIA, ASSIGNOR r0 FAIRMON'J. MINING MACHINERY eomram, A CORPORATION or wEs'r VIRGINIA.

SHAKER-SCREEN.

To aZZ whom it may concern:

Be it known thatI, WILLIAM BRASAOK, a citizen of the United States, residing at Fairmont, in the county of Marion and Y State of West Virginia, have invented certain ciprocating shaker screens, but particularly, 1

to a device adapted to be associated with such screens for facilitating their mode of operation.

In order to exemplify a preferred embodiment of the invention, as well as to disclose the operating theory of the principle involved, attention is directed to the accompanying drawing, in which Figure 1 is a side elevation of a shaker screen illustrating the application of the invention, and Fig. 2 is a bottom plan view.

In carrying out the preferred embodiment of the invention the shaker screen preferably comprises two independent screen sections A and B suitably suspended by a series of hangers C. The screen sections are adapted to reciprocate in opposite directions, and in order to impart the reciprocating motionto the sections, each one is connected to a rod D, preferably at a pomt midway between its sides such as at E. Each rod is in turn connected to an eccentric F which is mounted on a common drive shaft G with its highest point diametrically opposite the highest point on the other eccentric. With this construction, the necessary reciprocating emotion may be imparted to the screen sections in such a manner as Y to cause them to move in opposite directions, that is to say, when section A moves to the right, the section B will move to the left, and vice versa. In the physical embodiment of the screen as proposed In the preferred form of the invention, a doublestroke of both the sections is about five inches, and the number of double strokes of each section is about one hundred per minute.

Should the screen, as above described, be used without the device contemplated by the present invention, it would require a certain amount of energy for each section to accelerate from a standstill to its maximum velocity, and this amount of energy which would necessarily be stored in the Specification of letters Patent.

Patented Feb. 6, IlQiW.

Application filed April 3, 1916. Serial No. 88,635.

sections when they reach their maximum velocity, would be destroyed ,when the sections come to a standstill. This continuous storing and destroying of energy occurs at every stroke, or two hundred times p,'er minute. It is therefore proposed by the present invention to preserve the energy thus destroyed and reduce the motive power required to impart the reciprocating motion to a minimum. To accomplish these ends, an energy storing means is employed for absorbing the potential energy of the reciprocating sections at the time that they are being retarded, and then converting it into kinetic energy when the sections are being accelerated. In accordance with the present invention, this energy storing means preferably comprises a helical spring H, or a series of such springs which are interposed beneath the confronting ends of the two sections and suitably supported in a horizontal position between a pair of blocks 7 central position, the spring or springs will Y be without tension.

In operation, when the section A moves to the left and the section B moves to the right, a certain tension will be imparted to the spring or springs, which force will be expended again when the screens return to their central or normal position, and the section A will then move to the right, and section B to the left, thus compressing the spring or springs. This energy will be utilized again when the sections return to their central or normal position. It is to be seen that the spring or springs are extended and compressed at every double stroke of-the sections. Y In realizing vention, it is to be seen that the device is not only a practical one, but simple of construction, cheap to produce and durable in service. i

, I claim 1. In combination, a shaker screen, embodying in its construction oppositely moving screening sections, means for positively moving theisections; and energy absorbing and storing means carried by said sections adapted to absorb their potential'energy at the period of retardation, and later convert the energy thus absorbed into kinetic energy the characteristics of the in- I at the period of acceleration, said energy absorbing and storing means comprising a spring member mounted between confront ing portions of two of said sections and with its respective ends fixed to said sections.

2. In combination, a shaker screen, embodying in its construction oppositely moving screening sections, means for positively moving the sections; and energy absorbing and storing means carried by said sections adapted to absorb their potential energy at the period of retardation, and later convert the energy thus absorbed into kinetic energy at the period of acceleration, said energy absorbing and storing means comprising a spring member mounted beneath the confronting ends of two of said sections parallel to the line of their movement and with its respective ends attached to blocks carried by said sections.

3. In combination, a shaker screen, em-

bodying in its construction oppositelymovreciprocating screening sections, means imparting to said sections simultaneously, movements in opposed directions and resilient means carried by and adapted to be acted upon by both of said sections in each direction of its reciprocation, absorbing the potential energy of said sections at periods of retardation in their movement and giving back said energy at periods of their acbodyingin its construction oppositely moving screening sections, means for positively moving the sections; and energy absorbing and storing means carried by said sections adapted to absorb their potential energy at the period of retardation, and later convert the energy thus absorbed into kinetic energy at the period of acceleration, said energy absorbing and storing means comprising a spring member mounted between confronting portions of two of said sections and with its respective ends fixed to said portions, said spring acting resiliently upon said confronting portions by both tension and compression.

6. In combination, a shaker screen, embodying in .its construction oppositely moving screening sections, means for positively moving the sections; and energy absorbing and storing means carried by said sections adapted to absorb their potential energy at the period of retardation, and later convert the energy thus absorbed into kinetic energy vat the period of acceleration, said energy absorbing and storing means comprising a spring member mounted between confronting portions of two of said sections and wlth its respective ends fixed to said portions, the

means for moving the screening sections being offset from the plane of the screens and confronting portions projecting rigidly from the screening sections on the same side of their plane as the means for moving them,

.whereby tipping influence of the moving means is opposed.

The foregoing specification signed at Fairmont, W. Va., this 2nd day of March, 1916.

WILLIAM BRAsAoK.

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