US1353546A - Separator - Google Patents

Description

T. L. STURTEVANT.

SEPARATOR.

APPLICATION FILED SEPT. 21

Patented Sept. 21', 1920.

law/aw mji wa THOMAS erunrnvanr, or QUINCY, MASSACHUSETTS, ASS-IGNOR T0 .sruarnvnnr MILL COMP-ANY, or sos'ron raassacnusnrrs, A conronarron or MASSACHU- SETTS.

snrnna'roa.

Specification of Letters Patent. P tented Sept. 21, 1920. A

Application filed September 21, 1917. Serial No. 192,478.

To all whom it may concern.

Be it known that I, THOMAS L. STU'RTE- VANT, a citizen of'the United States, residing at Quincy, county of Norfolk, and 'State of Massachusetts, have invented an Improvement in Separators, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

The invention hereinafter described relates to separators for grading materials, and more particularly to devices for vibrating the screen of the separator.

Such separators usually comprise an inclined casing having a feed box at the top thereof containing a conveyer screw which feeds the material to 'be graded along the feed box over a feed board into the screen casing. The material flows along the upper surface of the screen, and the fines are delivered through one outlet and the tailings are delivered through another outlet at the bottom of'the casing.

In order to .efiiciently grade the material, it is necessary to vibrate the screen suficientlyto cause the material to pass readily through the screen without throwing the material too high above the screen to preventthe, grading of the maximum amount of the material as it flows along the screen.

"One of theobjec'ts of the invention is to a provide a simple and effective device for impartingthe desired character of vibration to the screen.

Another object of the invention is to provide a device 'for vibrating the screen which may be carried entirelyby the cover of the casing and be lifted upward therewith when it is desired to have access to the screen for thepurpose of inspection, removal or repair thereof.

Another object is to provide a device for vibrating the screen comprising a spring member combined with a pin adapted to project through the casing toward and to strike-the screen.

And still another object of the invention isto provide a device for'vibrating the screen which is simpleand cheap to manufacture,

The character of the invention 'may'bebest 22 of Fig. l and Fig. 3 on an enlarged scale is a detail view showing parts ofthe screen vibrating device. V

Referring to the drawing, the separator shown therein as an exemplification of the.

invention comprisesfa frame 1 having an inclined casing mountedthereon' comprising a bottom 3, side walls '5 and a-cover 7, having its upper endconnected by a 'hir'ige 9 with thecasing and its lower end adapted to rest upon a transverse member 11 adjacent the lower end of the casing,

One or more screens may be mounted in this casing, in the present instanceof the invention, a single screen being shown, comprising screen clothing 13 stretched upon a frame consisting of longitudinal side bars 15 and transverse end bars 17. The screen frame may be suitably supportedin the easing to permit the vibration thereof. In the present instance of the invention, the side bars of the screen frame are mounted on the upper curved ends of leaf springs 19 having springs may be limited by stops 23 mounted on said side bars beneath the upper curved ends of said leaf springs.

The screen is made somewhat narrower than the width of the casing, in order that it may be inserted into and removed from the casing without interference from the angle bars at the tops of the sides o'f,the casing. To prevent'escape of:the material over the side edges of the screen, shield plates 24 may depend from the cover and overlap similar plates 25 secured to and rising fI'ODl the side bars of the screen frame.

Next will be described the means for vibrating the screen. In the "presentinstance of the invention, this means comprises a spring member 26 having a part 27 secured in fixed position on a bracket 29 having feet secured to the casing cover. A pin 31 is carried by the resilient member and projects down through the cover toward the screen. in the present instance of the invention, the spring member and pin are formed of one integral ribbon of tempered steel or other suitable material, bent so that the spring member extends substantially parallel to the cover of the casing, and the pin projects transversely to said member perpendicularly to the cover of the casing.

Preferably, the bend in the ribbon is given a gradual curve 33 to add to the strength of the bend and contribute to the resilience thereof. The ribbon may also be given a bend 35 with a gradual curve further to contribute to the strength and resilience thereof. The lower end of the pin may strike any suitable part of the screen, such as its clothing, frame, or protective armor, or a member connected to the screen. In the present instance, the pin is adapted to strike the bottom of a guard 37 mounted on the clothing above a transverse bar 89 connected to the side bars of the screen frame. This guard has a deflector 87 which serves to divert the material from the point of intermittent engagement of the pin with the guard. To prevent objectionable wear on the screen part engaged by the pin, the lower end of the latter may be curved to present a foot 40 having a substantial bearing surface.

To facilitate the mounting of the combined spring member and pin in its operative position on the cover and to facilitate removal therefrom, the pin may project through an opening ell 3) in the cover sufliciently large to permit the foot d0 to pass therethrough. A ca plate 43 for this opening maybe secured by bolts to the cover, and have a hole therein to receive the Suitable means is provided for energizing or flexing the spring member to cause the pin carried thereby to strike and vibrate the screen. In the present instance of the invention, this means comprises hammers or strikers 45 pivotally connected to arms 4L7 projecting from a split hub 49 fast on a shaft 51 jonrnaled in bearings in brackets 53 secured to the top of the casing cover. The shaft may be rotated by any suitable means, unnecessary to show herein.

The construction is such, that as the shaft is rotated, the hammers fly around and strike successive blows adjacent the bend 38 of the strip. This flexes the spring member and causes the same to vibrate the pin 31,

which, in turn transmits the vibrations to the screen. The foot of the pin 31 preferably normally is out of engagement with the screen, but when the spring member is vibrated, it moves down into engagement with the screen and may impart blows thereto with a force diminishing as the amplitude of vibration of the spring member diminishes.

Since the pin is carried by the spring member, the screen is relieved from the weight and deadening effect of the pin thereon, thereby permitting a greater freedom of vibration of the screen than if it had to support the weight of a pin, which obviously would tend to diminish the screen vibration.

The pin delivers an instant blow to the screen and recoils immediately therefrom, in a manner somewhat similar to the action of a piano hammer in its tap on and recoil from a piano wire.

In a sense the spring member and the pin constitute a recoiling spring hammer for vibrating the screen, and the rotating strikers serve as the actuating means for setting the spring hammer in motion.

The present form of spring hammer means shown, has a high degree of liveliness due to the resilience of the member 26, pin 31, curved bends 3-3 and 35, and the curved foot 37 thereof.

The spring member and pin may be adjustably mounted. In the present instance, to accomplish this, one or more shims 55 may be interposed. between the top of the bracket and the fixed part 27 of the spring member and may be secured by bolts 57 entered therethrough.

This adjustment will permit the distance of the foot of the pin from the screen to be varied, and if desired the distance may be such that the pin will strike the screen with but a single tap for each blow of the rotating hammers. Also this adjustment will permit the end of the spring member struck by the hammers to be raised or lowered relatively to the axis of rotation of the latter to vary the force of the blows of the hammers on said member. Screens of different character and tension will vibrate differently, but this adjustment will permit the vibrations of the spring member to be timed and regulated to conform to different screens and conditions as desired.

The screen vibrating device described may constitute one of several similar units, the number of which. will vary according to the size of the screen and conditions as required. In the present instance of the invention, four such units are used, two on each of a pair of shafts mounted on the cover.

While the screen vibrating device has been shown as mounted on the cover, it will be understood that it may be located in a difi erent position if desired.

It will be understood that the invention is not limited to the specific embodiment shown, but that various deviations may be made therefrom without departing from the spirit and scope of the appended claims.

'What is claimed is 1. In a separator, the combination of a casing, a screen for grading materials mounted in said casing, and means for vibrating said screen comprising a bracket mounted on said casing, a resilient arm having one end secured to said bracket and a portion extending a substantial distance from said bracket along said casing, and a portion extending thence transversely to said first named portion through the casing and having an end for engagement with the screen, and rotary swing hammer means mounted on said casing for imparting blows to said arm at the juncture of said transverse portions.

2. In a separator, the combination of a casing, a screen for grading materials mounted in said casing, and means for vibrating said screen comprising a bracket mounted on said casing, a resilient member having a part adjustably secured to said bracket that the distance of said member from the screen may be varied, a striker member connected to said resilient member and projecting transversely thereto through means for intermittently engaging said resilient'member to cause the striker member to act on the screen, said casing opening being sufficiently large to allow the rounded end of said striker member to pass therethrough, and a cover plate fitting said striker plate for closing the opening in said casing.

4. In a separator, the combination of a casing, a screen for grading materials 'mounted in said casing, and means for vitially L-shaped member having a vibratory resilient leg extending approximately parallel to the screen and an integral striker leg projecting a substantial distance therefrom toward the' screen, and rotary hammer means for imparting blows to said members adjacent the juncture of said legs.

6. In a separator, the combination of a screen for grading materials, and means for vibrating said screen including a support, a substantially L-shaped member having a resilient leg with an end thereof secured to said support and a striker leg projecting from the opposite end of said leg toward the screen, and rotary hammer means for imparting blows to said member at the juncture of said legs.

In testimony whereof, I have signed my name to this specification.

THOMAS L. STUR'IEVANT.

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