US718098A - Pulp-screening machine. - Google Patents

Description

No. 718,098; PATENTED JAN. 13, 1903.

W. H. CROSBY.

PULP SCREENING MACHINE. APPLICATION PILEDMA'R. 29,4902. N0 MODE-L. r 2 SHEETS-SHEET I,

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PULP-SCREENING MACHINE.

SPECIFICATION forming part of Letters Patent No. 718,098, dated January 13, 1903.

Application filed March 29. 1902. Serial No. 100,596." (No model.)

To whom it may concern:

Be it known that I, WILLIAM H. CROSBYfa resident of Water-ville, in the county of Kennebec and State of Maine, have invented certain new and useful Improvements in Pulp Screening Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improved pulpscreening machine, the object of the invention being to provide an improved machine of this character in which the screening operation will be performed by a series of oscillating levers operated by double cam-wheels to raise and permit the lowering, of diaphragms and bellows-plates, and so construct the machine as to make it practically noiseless, almost free from jar, easy running, simple and light in construction, yet strong and durable to withstand all necessary strains thereon.

With this object in view the invention consists in certain novel features of construction and combinations and arrangements of parts, as will be more fully hereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a view in elevation, illustrating myimprovements. Figs. 2 and 3 are views in section, taken at right angles. Fig. 4 is an enlarged view illustrating a cam-wheel. Fig. 5 is a view of a lever.

1 represents a frame comprising end standards 1 and connecting bars 2 and 3, and parallel cross-bars 4 connect the bars 2 and are located equidistant apart for a purpose which will hereinafter appear. To one bar 2 a rectangular screen -frame 5 is connected by hinges 6 and is of the same size as frame 1 and secured thereon in a horizontal position by means of hooks 7 and eyes 8, as clearly shown in Fig. 1. In this screen-frame 5 and supported on cross-bars 9 a slit screen 10 is secured and spaced from the lower edge of the frame, thus forming a series of receptacles between bars 9, screen 10, and a series of diaphragms 11, of rubber or other suitable material, secured to the top of standards 1, bars 2, and cross-bars 4, the latter located directly beneath cross-bars 9 and serve as supports therefor and divide the machine into separate receptacles.

Below each diaphragm l1 and secured thereto is a bellows-plate 12, having downwardlyprojecting pins 13, mounted to slide in parallel guide-bars 14 and serve as guides for the bellows-plates, while a spring-metal strip 15 is secured to standards 1 and the lower edges of cross-bars 4 and connected between said points of attachment by pins 16 with the center of bellows-plates 12 to exert a downward pull thereon and hold them always against operating-levers 17, which will now be described.

The levers 17 are of a general T shape, the upper cross member 18 thereof pivotally supported at its ends in bars 2 and provided with curved arms 19, hearing against bellowsplates 12, so that when the levers are moved in one direction the arms 19 will raise bellows-plates 12-and diaphragms 11, and when moved in the opposite direction springs 15 will draw the bellows plates and diaphragms downward, and to oscillate the lower ends of these levers 17 I provide a series of camwheels 20. The drive-shaft 21 is reduced near its ends, forming shoulders, and journaled in bearings 23, secured to standards 1, the shoulders absolutely preventing longitudinal movement of the shaft, and a drivepulley 22 is secured on a protruding end of this shaft and adapted to be connected by a belt with any desired source of power. Each cam-Wheel comprises, in effect, a cylinder having a worm-groove around the same, in which a roller 2 1, carried by the lower end of lever 17, is mounted, so that as the cylinder is revolved the lever will be oscillated, and I preferably construct these cam-wheels in two sections adjustable by means of a screw to permit the groove to be made narrower in the event of its becoming too large by reason of constant wear. To reduce friction, I may inclose said cam-wheels 20 and lower ends of levers 17. in oil-tight casings 25, supported on lower bars 3 and adapted to contain liquid lubricant for the cam-wheels.

One edge of the screen-frame 5 is provided with a series of openings 26 to permit the pulp ICO to escape from the several receptacles into a trough 27, from which latter the pulp escapes through a port 29.

In operation pulp is drawn down through screen 10 by the action of bellows-plates 12 and diaphragms 11, they being operated by levers 17, as above explained.

By constructing a pulp-machine as pointed out the vibration is extremely slight as compared with machines of this character heretofore known, and I thereby greatly reduce the strain on the machine and the support therefor and am enabled to construct the machine much cheaper and yet have a more perfect working device than any heretofore constructed.

A great many slight changes and alterations might be resorted to in the general form and arrangement of the several parts described without departing from the spirit and scope of my invention, and hence I would have it understood that Ido not limit myself to the precise construction set forth, but consider myself at liberty to make such slight changes and alterations as fairly fall within the spirit and scope of my invention.

Having fully described myinvention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a pulp-straining machine, the combination with a frame, of a bellows-plate, a bellows diaphragm over said plate, a screen above the diaphragm, a lever to raise the bellows-plate and then permit it to descend, and a double cam-Wheel to oscillate said lever.

2. In a pulp-straining machine, the combination with a frame, of a bellows-plate, a bellows diaphragm over the same, a screen above the diaphragm, a pivoted lever connected with said frame and adapted when oscillated to raise said bellows plate and diaphragm, means for causing the bellows-plate to descend, and a double cam-wheel to oscillate said lever.

3, In a pulp-straining machine, the combination with a frame, a bellows, and a screen above the bellows, of a bellows-plate under the bellows, a pivoted lever having an arm bearing against said plate, double cam for oscillatin g said lever to raise the plate and then permit it to descend, and a spring connected with the bellows-plate and operating to cause it to follow the leverin the descent of thelatter.

4. In a pulp-straining machine, the combination with a frame, of a bellows-plate having guides on said frame, an approximately T-shaped leverpivotally supported at the ends of its horizontal member in the frame, arms on said horizontal member located against the lower face of the bellows-plate and adapted to raise the same and then permit it to descend when the vertical member of said lever is oscillated and means for oscillating said lever.

5. In a pulp-straining machine, the combination with aframe, a screensupported thereon, diaphragms beneath the screen, and bellows-plates secured to said diaphragms, oscillating levers to move said bellows-plates, a drive-shaft, cam-wheels on said shaft having worm-grooves therein, and rollers carried by the lower ends of said levers mounted in said grooves.

6. In a pulp-straining machine, the com bination with a frame, a screen-frame hinged to said frame and supported thereon and forming a series of receptacles below the screen, of diaphragms secured to the frame and forming the bottom of said receptacles, bellowsplates secured to said diaphragms, oscillating levers to operate the bellows-plates, a driveshaft mounted in the frame and having contracted journals to prevent longitudinal movement of the shaft, double cam-wheels on the shaft to oscillate the lower ends of the levers and lubricant-casings inclosing the cam-' wheels and supported on the frame.

7. In a pulp-straining machine, the combination with a frame and a screen-plate supported thereon, of diaphragms secured to the frame below the screen-plate, bellows-plates secured to the diaphragms, vertical pins carried by the bellows-plates, guide-bars perforated to receive said pins, springs to hold the bellows-plates depressed, and oscillating levers to raise said bellows-plates.

In testimony whereof I have signed this specification in the presence of two subscribing Witnesses.

WILLIAM H. CROSBY. Witnesses:

JAMES F. BUSH, HENRY A. FARWELL.

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