US922220A - Grain-screen. - Google Patents

Description

E. B. WAGK.-

GRAIN SCREEN. 4

AIPLIUATION FILED JUNE 11, 1808.

j Patented May 18, 1909.

2 SHEETS-SHEET 2.

UNTED STATES ATEN @FFME HENRY E. WACK, OF BALTIMGRE, MARYLAND.

GRAIN-SCREEN.

T o all whom it may concern:

.le it known that I, HENRY E. VACK, a cltizen of the United States, residing at Baltimore, in the State of Maryland, have invented certain new and useful Improvements in Grain-Screens, of which the following is a specification.

My invention relates to improvements in grain screens and has particular reference to a screen for separating the broken grain or foreign particles from the whole grain.

O ne object of the invention is to provide an improved construction of grain screen that wlll be of a simple and cheap construction; that may be readily put into position, and which will operate automatically to spread the grain as it passes therethrough so as to cause it to travel or flow over the screen proper in a broad thin sheet form so as to subject the entire bulk of grain to the action of the screen without injuriously breaking the grain.

Another object is to provide an improved construction of screen device that may be readily hung in any desired position to increase or decrease the pitch or angle of the screen proper and which may be operated to continuously screen the grain and separate the broken particles and convey them in one direction while the whole grain may be conveyed in another direction.

With these and other objects in view, the invention is illustrated in the accompanying drawings, in which,-

Figure 1, shows an exterior side elevation of the device. Fig. 2, a rear elevation of the same. Fig. 3, a central longitudinal section thereof on an enlarged scale, and Fig. 4, a detail on an enlarged scale of the devices for securing the screen frame in place.

In the drawings, the numeral, 1, designates the screen casing which in ractice is preferably formed of sheet meta and said casing comprises, in the present instance, a tubular inlet, 2; a tubular outlet or discharge nozzle, 3, and a iiattened intermediate portion, 4, between the inlet and outlet. The intermediate ortion of the casing extends in an inclined irection or at an angle with respect to the inlet and outlet and while the uppermost side, 5, thereof is closed the lower side is rovided with an opening, 6, through which the screenings pass, which o ening, in the present instance is of a rectangu ar shape.

Around the opening in the lower side of the casing I secure a frame, 7, which has a Specification of Letters Patent.

Application led June 11, 1908.

Patented May 18, 1909.

Serial No. 437,829.

form or shape corresponding to the shape of said opening, and this frame is preferably constructed of channel bars, 8, having the lateral iianges, 9, at its upper and lower edges. This frame forms the bottom support for the screen proper which may be a perforated sheet or woven wire, 10, as clearly seen in Figs. 3 and 4. Suitable stay rods, 11, extend lengthwise of the rectangular frame and have position immediately beneath the screen and in case the screen should sag these stay rods will serve to supp (rt the screen from the under or bottoni s1 e.

A broad flat surface plate, 12, is preferably interposed between the screen and the upper flanges, 9, of the frame so that the marginal edges of said screen may be clamped against the bottom or lower side of the casing as will presently be explained.

A hopper, 13, is positioned beneath the screen and has a large rectangular inlet opening, 14, at its upper side with a laterallyprojecting flange, 15, at the marginal edge of its wall. rlhis hopper has an inclined position with respect to the inlet and outlet of the screen casing and its opposite side walls, 16, rear wall, 17, and bottom wall, 18, all incline inwardly toward each other as they recede from the rectangular' inlet opening. The inclination of these hopper walls toward each other serves to direct the broken grains or particles that enter the hopper toward a common point, at which point l provide the hopper with a discharge nozzle, 19.

By reference to Figs. 3 and el it will be seen that the lateral flanges, 15, of the hop per seat up close against the lower flanges, 9, of the channel-bar frame and are held in close contact thereagainst by means of bolts, 20, that pass through the bottom or lower wall of the casing, then through the marginal edges of the screen proper and the reinforce plate, 12, and finally through the flange, 15, of the hopper. By this means the hopper is secured close against the frame and rigidlyT beneath the screen. suitable tubular chute, 21, may, and is preferably attached to the discharge-end of the nozzle, 19, to direct the small particles or screenings to a desired point of discharge. A valve, 22, having the form of a damper is preferably provided in the chute so the latter may be closed when desired. i Hooks, 23, or other suitable securing devices may be provided at the discharge-end of the chute, 21,

rn lim* to which a bag or other receptacle may be attached.

A conveyor chute, 24, telesco es over the lower end of the discharge nozz e, 3, to convey the screened grain to a point of dischar e.

Wien the grain enters the inlet, 2, of the casing I desire and find it advantageous to provide some means for spreading it in 'asheet form as it is delivered onto the upper end of the screen surface and to eifect this as well as retard its movement .l provide said tubular inlet with a flat spreader plate, 25. This spreader and baffle plate is reinforced at its lower edge by curling or bending the edge of the same into av tube, 26,. and when placed in thel inlet it has an inclined position as clearly shown in Fig. 3.

In practice the screen deviceis attached in any suitable manner to the discharge chute of a grain elevator, for example, so that the grain to be screened may enter the inlet, 2. rlhe grain then drops into the inclined baffle or spreader plate2'5, and in flowing over the lower edge thereof is spread in a sheet form as it passes into the upper end of the screen proper.

In traveling over the screen surface the broken particles will pass through the latter into the hopper and are directed by the incline'd walls thereof toward the outlet or nozzle, 19. rlhe whole grains however pass over the screen surface and through the discharge nozzle, 3, of the easing and into the chute, 24.

-Iaving thus described my invention what I claim and desire to secure by Letters Pat'- ent. is;-

l. A Vscreen com rising a casing having a tubular inlet; a tu4 ular outlet and a broad fiat intermediate inclined portion between the inlet and the outlet,-said intermediate portion being closed at its upper side and .avingan opening in its lower side, and a screen also extending in an inclined direction between said' inlet and outlet and having position at said opening in the lower side of the casing.

2. A screen comprising a casing having a tubular inlet and. a tub-ular outlet and acovered broad inclined intermediate portion between said inlet and outlet-#said covered discharge nozzle, a tubular inlet at the higher end of the broad inclined portion of the casing, atubul'a-r outlet at the lower end of the casing andi below the broad inclined portion and' a screen interposed between the hopper and the opening of the broadincl'ined portion ofthe casing.

n'testimony whereof I afIiX my signature in. presenceof two witnesses. Y Y HENRY E. TAC/K. Witnesses:

G'. FERDINAND Voor,y l CHARLES` B. MANN, Jr.

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