US1363276A - Vibratory screen - Google Patents

Description

J. C. SCHAFFER.

VIBRATORY SCREEN. I

APPLICATION man MAY 24, 1917.

Patented Dec. 28, 1920.

2 $HEETSSHEEI l- ATTORNEY J. C. SCHAFFER.

VIBRATORY SCREEN.

APPLICATION FILED MAY 24, 1917.

1 ,363,2'76. Patented Dec. 28, 1920.

2 SHEETS-SHEET 2.

3L C 8c Ina/7W INVENTOI? sr'k ATTORNEY OFFICE.

JOHN G. SCHAFFER, 0F TIFFIN, OHIO.

VIBRATORY SCREEN.

Specification of Letters Patent.

Patented Dec. 28, 1920.

Application filed May 24, 1917. Serial No. 170,587.

To all whom it may concern:

Be it known that 1, JOHN C. Sonarrnn,

a citizen of the United States of America, residing at Tiifin, Seneca county, ()hio, have invented new and useful Vibratory Screens, of which the following is a specification.

This invention relates to vibration apparatus and material separation, especially for dry classification.

This invention has utility when incorporated in vibratory screens for tailing over the coarser particles while the finer particles pass therethrough.

Referring to the drawings:

Figure l is a side elevation, with parts broken away, of an embodiment of the invention in a horizontally disposed vibrating screen, say for crushed stone or gravel separations Fig. 2 is an end elevation of the device of Fig. 3 is a plan view of one of the rockers or ipbratory supports for the screen frame of i 1' Fig: 4 is a section on the line VL-VI, Fig. 1, looking in the direction of the arrow- 5 is a plan view of the screen of Fig. 1; and

Fig. 6 is an end elevation of the rocker of Fig. 3.

The driving belt 1 may rotate the pulley 2 on the shaft 3 having fast therewith the minor eccentrics 4 having the adjusting half grooves 5 engageable by the bolt 6 in anchoring each of the eccentrics of this pair to the embracing or major eccentrics 7.

, There is thus afforded a simple and effective throw adjustment for the compound eccentrics. Embracing the major eccentrics 7 are the eccentric straps or yokes 8 from which extend the connecting rods 9 left hand threaded thereinto, while the opposite ends of these rods 9 have right hand threaded connection with the forks 10 connected by the pivot pins 11 to the rockers 12 fast with the transverse shaft 13 rockable in the bearings 14 carried by the main supporting frame 15.

This rocker 12 carries the upper bearing 16 for the transverse shaft 17 which through the brackets 18 carries the rectangular frame 19. This horizontally disposed frame 19 may have mounted therein the perforate sheet or wire cloth 20 drawn taut therein by the bolts 21.

The throw of this screen frame 19 is entirely effective definitely at the screen, for the rigidity of the screen holding when drawn up by the bolts 21 contributes to the positive transmission to the particles thereon the driving throws of the apparatus. Furthermore the material progress over this horizontal screen is determined. Fig. 1 shows the maximum throw adjustment for the eccentrics in vibrating the screen frame.

It is to be noted that this vibration or throw 1s such that the frame has but one down or low position and one up or high position, 6., the rock down being always in but one direction and then recovering, this all occurring on one side of the high point. As shown, the stock travel on the screen will be toward the right in Figs. 1, 5. For shorter throw adjustments, the distance to the top throw position and to the bottom throw position is reduced, but equally, leaving the mean or neutral position constant throughout the full range of throw adjustments. Accordingly, the throw adjustment for the shorter strokes desired in finer material handling is accomplished merely by shifting the bolt 6 in each eccentric 4 for registry with the same relative half opening 5 of the pair.

The rapidity of these throws is absorbed in the apparatus of this disclosure with a minimum of undesirable shock transmission to the frame, due to the rocker buffers acting vertically or transversely of the frame vibrations or reciprocations. Further, these rocker buffers are disposed in oppositely acting pairs, tending in themselves to absorb shock and assist in recovering throws.

The short arm of the rockers 12 from the bearings 16 carry the bearing pins 22 for the hanging links 23 having pivotal connections 24 with the cross heads 25 having oppositely extending guides 26 directed toward similar opposing tubular guides 27 in the frames 28 carryingthe rods 29 through the upper helical springs 30 and the lower helical springs 31. These yieldable means may act say during compression alternately. The longer arms of the rockers 12 may carry the pivot pins 32, connected by the links 33 to connections 24 on cross heads 25 below the helical springs 34 and above the helical compression springs 35.

In the reciprocatory travel of the frame 19, the oppositely acting springs 30, 35, are simultaneously compressed, tending to neutralize the concussion in themselves at an angle to the horizontal throw of the screen;

the throws, not only contributes to the life.

of the installation with a minimum of power consumption, but is a feature in the uniform grading of output. The unldlrectional actuatingthrow of the screen tosses the stock for progressive tumbling so that all portions thereof impact the screen.

I What is claimed and it is desired to secure by Letters Patent is;

1. A reciprocable frame, a base, rocker supports having parallel fixed fulcrum bearings in the base carrying the load of said frame, and yieldable. means coacting with said rocker supports transversely of the frame reciprocation for cushioning the downward travel of the frame.

2. A reciprocable frame, a base, a rocker support having a fixed fulcrum bearing in the base carrying the load of said frame, and yieldable means between the rocker and base simultaneously coacting in two directions to neutralize transmission of reciprocation concussion from the downward travel of the frame.

3. A reciprocable frame, a base, a rocker support having a fixed fulcrum bearing in the base carrying the load of said frame, and neutral position determining means coacting between the rocker and base for cushioning the downward travel of the frame.

4. reciprocable frame, a base, a rocker support having a fixed fulcrum bearing in frame supporting link pivoted to the base and frame, said link having an angularly extending arm, and buffer: means coacting to oppose arm travel in two directions for gushioning the downward travel of the rame.

7. A reciprocable frame, a base, a rocker frame supporting link. pivoted to the base and frame, said link having an angularly extending arm, a second link connected to said arm, a crosshead to which said second link extends, a slide guide for the crosshead, and helical springs on each side of the crosshead.

8. A reciprocable frame, a base, a rocker frame supporting link pivoted to the base and frame, said link having a pair of angularly extending arms, depending links connected to said arms, crossheads to which the links extend, and helical springs coacting with the crossheads to provide buffer means for the frame for cushioning the downward travel of the frame. v

9. A reciprocable frame, a base, a rocker frame supporting link pivoted to the base and frame, and frame actuating means and buffer means connected to the link for cushioning the downward travel of the frame.

In witness whereof I aflix niyAsi nature.

JOHN 0. so F'iER.

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