US449342A - Sifter or screen - Google Patents

Description

(No Model.)

J. B. WHITE. SIPTER 0R SGREEN.

No. 449,342. Patented Mar. 31, 1891 [menor Jar wb-B. mam

n15 new: FEIERS cu, wo'rom'nm, WASHINGTON, a. c.

extend above and below the box A.

STATES PATENT SIFTER OR SCREEN.

SPECIFICATION forming part of Letters Patent No. 449,342, dated March 31, 1891.

Application filed January 8, 1891- Serial No. 377,130- (No model.)

To all whom it may concern:

Be it known that 1, JARVIS BUFFUM WHITE, residing at Millbury, in the county of \Vorcester and State of Massachusetts, have invented certain new and useful Improvements in Sifters or Screens, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to sitters or screens for ashes, sand, and the like.

The object of the invention is to produce a screen or sifter which may be easily operated, and which will be effective in operation.

Figure l of the drawings is a perspective view of the screen and support. Fig. 2 is a section on line m m, Fig. 1. Fig. 3 isa broken detail elevation showing the star-wheel and abutments on the side of the screen.

A indicates a box, frame, or casing of suitable size and provided with legs A which The bars A A connect the upper ends of the pairs of legs, as shown in Figs. land 2. Rods, ropes, or wires are connected to the bars A and to swing-boardsF F ata suitable distance below said bars A. The bars F and their supporting ropes or wires form two swings, one swing being near each end of the frame or casing. The ropes or wires (6 maybe supported at the top in swivel-rings b, orin other suitable manner, for supporting a swing.

The screen proper B, having a bottom G of suitable mesh, rests near its ends on the swingbars F F. The corners of the screenboX B may be notched to fit closely on bars F; but this is not essential. The screen can be readily removed from the swings for dumping coals, gravel, or the like.

One side of the screen B has two projecting ears or abutments E E, these abutments being arranged obliquely from the center of that side of the screen to which they are applied.

A star-wheel or armed wheel D is hung on a shaft D in the casing A in such position that its center is between the lugs or abutments E A crank 0, connected to the shaft D, serves as a means for turning the star-wheel. The lugs E E are at such distance from the center of the star-wheel that they Will be engaged alternately by the arms of the starwheel as the wheel is rotated. Thus one arm of the star-wheel will strike the lug E and move the screen quickly to the right, and immediately thereafter another arm will strike lug E and move the screen to the left, thus producing a very rapid shaking of the screen.

As the screen is supported on swings, but very little power is required to move it in either direction. The longer the cords or rods a the easier the swing will move, as in swinging a pendulum.

The star-wheel D is shown as having three arms. With such construction the screen will have six impulses or three complete reciprocations with each rotation of the crank C.

It is evident that the star-wheel may have more or less than three arms, that the screen may be of any suitable form, and that the sustaining swings or swinging rods or cords may be connected to the screen in other suitable manner.

A very important feature of the invention is that the screen will be supported as a swing or pendulum.

Screens have been heretofore made and supported on rolls or slideways, and caused to reciprocate by various mechanical connections. Such require much more power to operate than when made to swing from a support, as in my construction.

\Vhat I claim is- 1. The screen or sifter sustained by cords or rods so as to swing from a suitable support, lugs on the body of the screen, and an armed wheel having its arms in position to engage the said lugs as the wheel rotates in. combination.

2. The combination of the frame or casing having pendulous supports, the screen suspended thereby, the lugs on the screen-body obliquely arranged, as described, and the armed wheel supported on the casingand having its arms extending between the lugs on the screen, all substantially as described.

In testimony whereofIatliX my signature in presence of two witnesses.

JARVIS BUFFUM WHITE.

Witnesses:

IRA N. GODDARD, J OSEPHENE O. GODDARD.

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