US281707A - Daniel w - Google Patents

Description

(No Model.) D. W. MARMON.

. AUTOMATIC FEED GATE. No. 281,707. Patented July 24, 1883.

WITNESSES. IN VEJV TOR.

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U ITED STATES PATENT FFICE.\

DANIEL IV. MARMON, OF INDIANAPOLIS, INDIANA, ASSIGNOR TO THE NORDYKE &; MARMON COMPANY, OF SAME PLACE.

. AUTOMATIC FEED-GATE.

SPECIFICATION forming part of Letters Patent No. 281,707, dated July 24, 1883.

Application filodDccemher :6, 18%). (No model To all whom it may concern.-

Be it known that I, DANIEL W. IVIARMON, of the city of Indianapolis, county of Marion, and State of Indiana, have invented certain new and useful Improvements in Automatic Feed-Gates, of which the following is a specification.

My invention relates to that class of feeding devices which are adapted to be automatically operated by the material passing through them, or, in other words, in which the opening is increased by the additional weight of the material as the hopper fills, and decreasedas the amount of material in the hopper grows less. It isespecially intended to be used with roller-mills, but maybe used with middlingspurifiers, or in any place where fine material is to be gradually fed to a machine.

Referring to the accompanying drawings, which are made a part hereof, and on which similar letters of reference indicate similar parts, Figure 1 is a transverse vertical section on the dotted line 2 2, Fig. 2, of the hopper and feed mechanism of a roller-mill embodying my improved gate; Fig. 2, aside elevation of the same; and Fig. 3, ahorizontal sectional view, looking upwardly from the dotted line 4 y, Fig. 2, showing the gate and feed-rolls in under-side plan.

In said drawings, the portions marked A represent my improved gate, Bthe feed-roll, and O the hopper, said hopper and feed-roll being of any desired or appropriate forms. The gate A extends from end to end of the machine, alongside the feed-roll, and is mounted on pivots a, near the feed-exit of the hopper, It has an arm, A, which extends around to a point inside the hopper, above the roll, upon which is a lug, a, to which a spring, A, is attached. The effect of this spring, as will be readily seen, is to urge ,the gate toward or against the roll B. A small rod, a at the end of this spring, and a thumb-nut thereon, or

some other suitable means of adjustment, should be employed to regulate the tension of this spring, and thus determine the force necessary to overcome it to increase the feed. The spring is secured to the hopper by a suitable eye or clip, 0. A suitable weight might be used instead of the spring A", if desired,

though I prefer the spring, as being more sensitive than a weight. Attached to or resting against the inner end of the arm A-is a pressure-board, A. The preferable (because simpler) construction is that shown at the right of '5 5 Fig. 1, where the board is shown attached rigidly to the arm A; but pivoting the board separately on a pivot, a accomplishes the same result. The board A is surrounded with flexible material a, (as cloth,) which is also attached to the hopper, and prevents any of the material from getting behind the press ure board.

The operation of my invention is as follows:

The s rin A when the hopper is empty,

ery of material to the hopper should be 75 checked, the decreased pressure permits the spring A to close the gate sufficiently to maintain an equality between the inflow and outflow of the material. In case the inflow should cease, the gate would close, but would imme- 8o diately reopen upon the supply being resumed.

A distinguishing feature of my invention is e that the force of the material in the hopper in creases more than proportionally as said material rises nearer the top of the hopper. The 8 5 reason for this is that the pressure-board is pivoted near to or below its lower edge, and the material therefore has a leverage which increases, of course, the farther it gets from the pivot. and thus the fiow is kept much more uniform with the supply than-is otherwise practicable.

' I have chosen to illustrate my invention as it appears when used in connection with the feed-rolls and hopper of a roller-mill, and, 5

rather for the purpose of showing an alternate construction than otherwise, I have shown a hopper which is applicable to a double mill. Said feed-rolls, however, have nothing to do with my present invention, and might be dis- IOO As the material rises it exerts an in- This makes my gate very sensitive, o

pensed with entirely by simply extending the sides of the hoppers down far enough so that the gates would come directly in contact therewith; and it is manifest that the double construction shown is simply a matter of selection, for the reason before stated, and that a single hopper might as well have been shown instead.

This invention relates solely to the feedgate and its operating mechanism, and, as here inbefore stated, the hopper and feed-roll may be of any form desired.

Having thus fully described my said invention, what I claim. as new, and desire to seeu re by Letters Patent, is

1. The combination of the feed-hopper, the feed-gate therefor, an arm attached to said feed-gate. and extending around to a position inside the hopper, a pressure-board which rests against the inner end of said arm and is supported by a pivot near to or below its lower end, and a spring which exerts its force oppositely to the pressure of the material upon the pressure-board.

2. The combination of the hopper, the feedgate A, the pressure-board A", connected to said gate and pivoted near to or below its lower edge, and means for holding said gate downward and said pressure-board forward, sub stantially as set forth.

3. The combination of the hopper, the gate, the arm, the spring, the pressure-board, and the feed-roll, said several parts being arranged and operating substantially as shown and described, and for the purposes specified.

In witness whereof I have hereunto set my hand and seal, at Indianapolis, Indiana, this 22d day of December, A. D. 1882.

DANIEL \V. MA RMON.

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