US923108A - Vibrating screen or separator. - Google Patents

Description

W. J. BELL & T. L. 6; T. J. STURTEVANT.

VIBRATING SCREEN OR SEPARATOR.

APPLIGATION FILED 0014, 1907.

Patented May 25, 1909.

VIBRATING SCREEN OB SEPARATOR.

APPLICATION FILED 00124, 1907.

-' Patented May 25, 1909.

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WILLARD .l. BELL, Oh NEWAYGO, MICHIGAN, AND THOMAS LEGGETI STURTEVANT, 0F QUIN(JX, AND 'll'lQMAS JOSEPH STURTEVANT, OF WELLESLEY, MASSACHUSETTS; SAID 'l. L. AND 1. J. SlUlvTlEVAN'l ASSIUNORS TO SAID BELL.

'VIBRATING SCREEN 0R SEPARATOR.

Specification of Letters Patent.

Patented May 25, 15509.

1 Application filed October 4, 1907. seihino. 395,935.

1m1f/.l.i1.-/wm it may concern:

llc it known that we, \Vmmnn J. BELL,1'L-- aiding. at N'mvaygo, in the county of Newaygo, State of i\lichigan; 'lnonas L. S'ri'irrrnnx'r. residing at Quincy, county of Norfolk, State of :dassachnset ts, and THOMAS J, li'lllt'lI-IVANI, residing at lVellesley, in the county of Norfolk, State of Massachusetts,

have invented certain new and useful IMF device ot such construction that the vibra lions ot' the screen will be as free as possible, as also to protect the screen surface from being injured by the percui mechanism, and to hold the s .reen surface at all times under an automatic elastic tension.

in the acconipanying drawings Figure 1 is an elevation of the improved machine, and Fig. 2 a vertical section of the same.

Figs. 3 and --l are detail views of the screen frame and screen.

I lte'l'erring to the drawings, 12 denotes a suitable framework onwhich the screen box 13 is suitably supported in an inclined position, provision being preferably made for changing the angle of inclination of the said screen box by providing the upper ends of the longer uprights or posts of the frai-ne with a series of holes 1,4 in any one otf which may be placed a cross bolt 15 which secures the upper end of the screen box to the said posts. To the bottom piece or frame to of the screen box suitable springs .17 are attacheth said springs elastically supporting the screen frame lb. The said frame may be 'n'ovided with an upper scrccn it) and a lower screen 20, as in the construction shown by the patent referred to, said upper-screen being course! than said lower screen. it is, however, not essential that our improved construction shouldinclude two screens oiidiflerentmesh, as for some classes of work only a single screen may be desired.

"In order to ccure the best possible vi ive vibrating brating results it is necessary that the Wire cloth of the screen should be kept under an elastic tension, and to this end one of the side pieces 18 of the screen frame, to which the wire cloth is attached, is preferably slidably mounted in the top and bottom piece of the said frame, and the wire cloth is kept under -a strong elastic tension by springs 21 encircling cross rods 22 which push outward against. the opposite side pieces of the frame, and by means of which springs and cross rods the wire cloth 'or' screen proper attached to the frame will be stretched or keptvautomatically under a strong elastic tension. This automatic elastic tension of the screen we consider very important.

Attached to the bottom piece 16 of the screen box are hollow guides 23 in which are mounted sliding strikers or impact bars 24 by which percussive vibrations are imparted to the screen; said impact bars being acted on by swinging hammers 25 carried by rotating arms 26 driven from the shafts 27 journaled in suitable hangers 27" depending from the bottom of the screen box. The impact bars 25 are proyidcd with slots 28 through which pass pins 29 which Will'prevent said bars from sliding down and out of the hollow guides 23; said impact bars retiring or falling, by gravity, away from the screen after having been forced upward percussivcly by the rotating hammers By arranglng these sliding impact bars below the screens, instead of above the same, as in the construction of the patent hereinbefore mentioned, the said impact bars will not. remain in contact With the screen under theinfiuence of. gravity, in such a manner. as to check the v brations or lfllllllg moveinents thereoflbutwill retire therefrom immediately after the percussive strokes.

The jarring impulses of the strikers or im-.

or parts being provided with depending flanges surrounding and overlapping the dpper ends of the hollow guides 23,-so as to prevent the screened material from passing into said guides. These protecting strips prevent the screen surfaces or delicate'wirecloth screens from being damaged by the percussive hammer strokes acting through the impact bars.

, by suitable sprocket earing.

In order that the hammers 25 may give sudden quick percussive strokesto the strikers or impact bars 24:, and thus avoid drag of the sand hammers over said strikers or,

bars, the lower ends of the latter will preferably be rounded and the ends of the hammers likewise rounded to enable or permit the said strikers or impact bars to drop by gravity or be otherwise caused to rebound, or be removed as by the action of springs, as soon as they have delivered their percussive blows.

The screen box 13 is-preferably provided at its'upper side with suitable hinged covers 36 to permit of access to the chamber of the said box; and the upper end of said box is also provided with a hinged door 37 through which the screen frame and screen may be inserted into or removed from the chamber of said box.

To prevent the screen-frame from lifting under the impulse of the vibrating posts or bars any suitable means, as the cross rod 38 at the lower end of the screen frame, may be provided.

Y By arranging the strikers or impact bars I 24 and their operating mechanism below the screen frame, instead of above, as in the constructionof the patent, hereinbefore referred to, the percussive )arrmg or vibrating mechanisn'i will be out of the way, so that the screen may be inserted -1nto or removed from the screen box more conveniently than with the former construction.

, Having thus described our invention we claim and desireto secure by Letters Patent:

1. The combination with a wire cloth screen, of a frame on which said-screen is mounted, -means, comprising stretchmg springs mounted on the said frame, acting on said wire cloth screen and serving to hold the same under elastic tension in said frame jured by the percussive mechanism..

Icloth screen, of a frame-work on which the 2. Thecombination with an inclined, wire same is sustained, means for changing the angle of inclination of the said screen, means for imparting percussive vibrating movements thereto, and one or more stretching springs mounted on said frame and acting on the said Wire cloth s reen and serving to hold the screen surface under elastic tension relative to the bars of said frame.

3. 111 a separator, the combination with a wire cloth screen, of a frame to which said screen is attached, and which-frame comprises a loosely mounted side member, one or more springs, cooperating with said side member, for automatically maintaining said screen under elastic tension, and percussive jarring means for vibrating said screen.

4. In a separator, the combination with a substantially rectangular frame having one of its side members slidably mounted on the two adjacent end members, one or more springs for exerting a yielding pressure upon said slidably mounted member, a wire cloth screen attached to said slidably mounted member and to the other members of said frame, and percussive jarring means for vibrating said screen.

5. The combination with an inclined, spring-supported,wire cloth screen, of mechanism arranged below the same and serving to impart percussive vibrating movements thereto, a frame on which said screen is mounted, and one or more stretching springs acting on the said wire cloth screen and serving to hold the same under elastic tension relative to the bars of said frame.

(3. The combination with an inclined,springsupported wire-cloth screen, of stretching face and comprising hammers and impact bars acilr percussively on the screen from below the same, and means for-protecting said screen from being damaged by the percussive hammer strokes.

3. The combination with an inclined, springsupported screen, of means,.comprising stretching springs, for maintaining the screen surface under elastic tension, sliding impact bars arranged below said screen, so as to retire therefrom by the action of gravity, for imparting percussive vibrating movements thereto, hammers arranged to .strike said impact bars, and protecting means for preventing the screen from being injured by thev percussive hammer strokes.

9. The combination with an inclined, spring-supported screen, of strikers or impact bars normally out of contact with said screen, hammers for causing said strikers v or impact bare {cg intermitti'nglyaetg ()Ilsfiid n, hemmera ior i g said strikers 1 1 mane fer holding e sari screen under d i teaeien a '10-: The eembination with-"aw p g-s paeree, and hammers for causingsaid strikera 61 impact bars-to act .mtermlttmgly 0n sai fQrthepumose of vibratmg qr Jamie the ame."

, 11. Lhc combination with an inclined,

spring=sup orted screen, of retiring strikers-- 1'5 said screcn and hammers for causmg said or impact are normally out of contact with etrikers'or Impact bars to act'on said .screen same, sald impactjbars and ammers having.

bars.

b (WW and ndrmally Bellaout of cont'act'with said gcrefen, hammers fer u i g said "strikerarer impact. bars' t ai i ct an eaid' screen 91? the purpcee of vibratgflia game and means "for holdmgthe sald eereen under elastic tension. 18. combination with aninclined,

spring-supported screen; ofineans \vwrhereley the angle, of inclination of sai d'screenz may be vii-med retiring impact .bars,-. arranged beneath'and normally out of contact 'I r sa1d screen and actmg percussrvelypn sald-v Screen, for jarring or. ibratin'g ,the same, and means for operating sald lmpacbbars.

z 14.; The combination with an inclined,

sprin -supported ,scfeen', bf means whereby the angle-of inclination of said screen may neat-h and normally but of contactwith said -s c1"een and. acting percussively 6n said screen, for jarring or vibrating the same, means for Operatmgsard 'lmpactbars, and

In teatimeny wherec'fwe afiix cur sig- I namreaiu presenceof'two' Witnexses V I rounded ends to avoid drag of, the said ham; r -mers oversaid y "912.1'11'16 combination with animliged, spring-supported screen, of recirmggtrikera a -01 impact bars arranged WILLARD 3-. BELL. r

"THOMASJOSEPHgSTURTEYANTQ rWItIIGSSQS- to the v srg'natrl re. Of WflIar-d J.

v Ror G; Scormw. Witnesses 'to-the signatures of Thcs R BEBT M, GAY,"

- HENRY A. TOMLINeON'.

be varied, sliding'impact bars, arranged be:

' means for'holdingtghe screen 'snrface under 7 "elastictensicm, Q

f01'-tl1e l1I"pOSe 0f vibratin -or jarring the EHOMAS LEGGETT STURTEVANT,

Lows 1 f

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