US436345A - Pulp strainer and clearer - Google Patents

Description

(NovModel.)

C. J. FOSTER. PULP STRAINER AND GLEARBR.

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a l I' U NiTED STATES PATENT OFFICE.

CHARLES J. FOSTER, OF VVESTBROOK, MAINE.

PULP STRINER AND CLEARER.

SPECIFICATION forming part of Letters Patent No. 436,345, dated September 16,1890.

Application led November 4,1889. Serial No. 329.187. (No model.)

To ZZZ whom it may concern.'

Be it known that I, CHARLES J. FOSTER, of Westbrook, in the county of Cumberland and State of Maine, have invented certain new and useful Improvements in Pulp Strainers and Clearers; and I do hereby declare that the fol lowing is afull, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to lett-ers of reference marked thereon, which form a part of this specification.

My invention relates to improvements in pulp-screening machines. It consists of a stationary vat having a screen in the bottom thereof, a diaphragm connected to said vat by a suitable packing and having a valve therein, and means for imparting a vibratory motion to said diaphragm and to open and shut said valve at stated times with reference to the position of said diaphragm, in such manner that the upward or clearing force of the machine shall be greater than the downward or straining force.

In the drawings herewith accompanying and making a part of this specification, Figure lis a central Vertical section of my improved machine; Fig. 2, an end elevation; and Fig. 3 is a detail showing cams and connecting-rods for the diaphragm and valve and the position of the cams on the shaft relative to each other, the cam and connecting-rod that operates the diaphragm being shown in dotted lines, and same letters refer to like parts.

In said drawings, d shows a hopper or vat into which the pulp is placed before strainn ing, and b the strainer-plate in the bottom thereof, said vat being supported by a suitable frame c.

Beneath the vat is a diaphragm CZ, arranged so as to form a more or less nearly air-tight connection between it and said vat and to have a vibratory movement in a vertical direction.

The upper sides of the diaphragm d may extend up between the outside of the vat and the inside of the supporting -framev This serves to steady the diaphragm.

Between the diaphragm CZ and the vat a is a packing e to make a tight connection, that shown in the drawings being a cylindrical rubber, which will roll up and down as the diaphragm vibrates. Instead of the rubber shown, a leather or other iieXible substance may be stretched from the outside of the vat to the diaphragm to form the packing.

The diaphragm receives a vibratory motion from cams f, arranged upon the shaft g so as to strike against the connecting-rods h, rigidly attached to the diaphragm. These cams f have the shape substantially as shown in the dotted lines in Fig. 3, having the part S, in which the diameter gradually decreases, and the part t,in which itsuddenly increases, so as to give the diaphragm a very sudden upward motion, to hold it at its highest ele vation for half, more or less7 of the revolution of the cams andthen permit it to drop slowly.

The bottom of the diaphragm may slopev toward a common center, and has in said bottom a valve t', adapted to open and shut by means of a cam j, having a segment u, which engages the connecting-rod a part of the time only, set on shaft g, and a connecting-rod Zt, attached to a lever Z, one end of which is pivoted at m to the diaphragm and the other adapted to carry the valve t'.

The operation of the valve 7l with reference to the movement of the diaphragm may be seen by the arrangement of the cams f andj with respect to each other on the shaft g, as shown inFig. 3.

n and o are fast and loose pulleys, respectively, for operating the machine, and p is a stay to steady the lever which carries the valve, and q and r are stays to support the connecting-rods h and k, respectively.

The operation of my improved machine is as follows: The ground pulp is introduced into the vat and the diaphragm iilled with water, the valve t' being closed, as shown in the drawings. The shaft g, with its cams, is then revolved, the part t, striking the connecting-rods, forces the diaphragm upward with a sudden movement, and the diaphragm being full and the valve closed a part of the contents ofthe diaphragm is forced up through the holes in the strainer-plate, thus keeping said holes from being stopped up by the pulp or any foreign substance. .As soon as the diaphragm is raised as far as cams f will carry it, the cam 7' strikes the connecting-rod IOO k, which operates the, valve-lever and opens the valve, allowing a portion of the contents of the diaphragm to escape therethrough. As the contents of the diaphragm escape through the valve, an equal quantity of the pulp in the Vat passes down through the holes in the strainer-plate. As the shaft g continues its revolution, the cam f at length ceases to hold up the valve and it returns to its seat, and thereafter the cams f permit the diaphragm. to fall gradually preparatory to being again forced up to clear the strainer-plate, and so on continually. It will thus be seen that. the upward force is sudden and violent to effectually clear the screen, while the downward force is grad ual and easy to draw or suck the pulp through the strainer.

The advantages of my improved machine consist in the fact thatitdoes not get clogged, it does not suck through the screen any coarse matter, it has a greater clearing force than straining force, the packing is all on the outside where it can be easily looked after to prevent wear, the pulp is strained more evenly, and the machine is cheaper than others, in that it does more work in a given time.

I-Iavng thus described my invention and its use, what I claim, and desire to secure by Letters Patent of the United States, is-

1. The combination,in a pulp-screening machine, with a stationary vat having a screen in the bottom thereof,l of a vibratory diaphragm, a suitable packing between said vat and diaphragm, a valve in said diaphragm, and mechanism, substantially as set forth, for imparting a vibratory motion to the diaphragm and t0 open and close the valve, as and for the purposes set forth.

2. In a pulp-screening machine, the combination, with a stationary vat having a screen in the bottom thereof, of a diaphragm connected to said vat by a suitable packing and having an escape-Valve therein, and means for imparting a vibratory motion to said diaphragm and to open and shut said Valve atstated times with reference to the position of said diaphragm, for the purposes set forth.

3. In a pulp-screening machine, the combination, with a stationary Vat having a screen in the bottom thereof, of a vibratory diaphragm, a suitable packing between said diaphragm and vat, and escape-valve in said diaphragm, and mechanism, substantially as set forth, adapted to impart to said diaphragm a vibratory motion of varying velocity and to open and shut said valve at stated times with reference to the position of the diaphragm, as and for the purposes set forth.

In testimony that I claim the foregoing as my own I affix my signature, in presence of two witnesses, this 24th day of October, A. D. 1889.

' CHARLES J. FOSTER.

Vitnesses:

ELGIN C. VERRILL,

WILLIAM HENRY CLIFFORD.

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