US581671A

US581671A - James bishop

Info

Publication number: US581671A
Authority: US
Publication date: 1897-04-27
Anticipated expiration: 1914-04-27

Description

(No Model.)

J. BISHOP.

PAPER PULP SCREEN. No. 581,671.Y Patented Apr. 27, 1897.

IIIIII ull rrn Srarns ArNr Ormeso JAMES BISHOP, OF HULL, CANADA, ASSIGNOR OF ONE-HALF TO JOHN PAINTER, OF SAME PLACE.

PAPER-PULP SCREEN.

SPECIFICATION forming part of Letters Patent No. 581,671, dated April 27, 1897. Application iiled December 9, 1896. Serial No. 615,071. (No model.)

To all whom t may concern.-

Beit known that I, J AMES BISHOP, of Hull,-

in the Province of Quebec, in the Dominion of Oanada,have invented certain new and useful Improvements in Paper-Pulp Screens; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, in Which- Figure l is a top view of my pulp-screen, the screen partly broken away to show the inclined divisions in the trough; Fig.2, a side elevation of the same; and Fig. 3, a section on line X X, Fig. l, the screen shown as entire.

My invention has for its object to prevent the meshes or perforations in a paper-pulp screen from becoming clogged with pulp by passage of air through one-half the meshes in alternate and opposite directions, and also to prevent the accumulation of cstrings of solidified pulp hanging from the bottom of the screen, which, dropping into the vat, do not amalgamate with the semifluid pulp, but cause irregularit7 and breaks in the paper when the pulp is made into paper.

My invention consists of a bottomless trough divided by one or more vertical longitudinal partitions and inclined transverse partitions, the alternate rows of spaces formed by the divisions inclining in opposite directions, a screen within said trough and above said divisions, and means for reciprocally agitating the trough, so that when moving in one direction the correspondingly-inclined series of divisions will force the air upward through the meshes and the reversely-in clined series of divisions will suck through the meshes above them, and when the trough moves in the opposite direction a vice-versa air action through the screen-meshes is produced.

A is the vat, which receives the screened pulp, and A an opening in the side to remove the pulp.

B is a bottomless trough mounted partly within and partly above the vat, preferably by a spring O at each end, the ends of the springs thickened to rest in bearings D, secured to the corner-posts E, which support the vat, so that the trough can be shaken reciprocally in a short tremulous motion by suitable mechanism. l

The trough B is divided longitudinally by one or more vertical partitions B and subdivided by transverse partitions B2. One half of the number of said partitions B2 incline in one direction and the other half in the opposite direction, said partitions and divisional spaces forming an open bottom to the otherwise bottomless trough.

F is a screen lying on the partitions, and through the meshes or perforations of said screen the pulp passes into the vat below when the trough is agit-ated reciprocally.

The trough is reciprocated by anysuitable mechanical means, preferably by pitmen K K, one at opposite sides, connected to ecceir tries L L on a shaft P, journaled in bearings supported by the end posts E and carrying a cone-pulley M. A cone-pulley N is jour-v naled below the same and carriesa iiy-wheel R, and said pulleys are connected by a belt Q for adjusting the speed.

The trough above the screen is iilled with the semiliquid pulp to be screened and the trough agitated reciprocally. When the trough moves in one direction,the air in spaces G, which incline in that direction, will move upward and clear the perforations or meshes covering said divisional spaces, and the other divisional spaces, II, will cause suction through the perforations or meshes above them and prevent the formation of strings of solidified pulp accumulating on the bottom of the screen and dropping into the vat, to the injury of the paper when made.

Then the trough is reciprocated in the opposite direction, the divisional spaces G Will suck and the divisional spaces H blow through the meshes of the screen. The sucking spaces become blow-spaces at the return motion of the trough.

The trough may be divided into inclined divisional spaces by any preferred arrangement of partitions, and I do not limit myself to the series shown and described herein.

I claim as my inventionl. A paperpulp strainer, comprising a bottomless trough divided by a vertical longitudinal partition B', and transverse partitions IOC B2, on opposite sides thereof, the partitions on one side of the longitudinal partition slo'ping in an opposite direction to the partitions on the other side, a screen F, covering the divisional spaces Within the trough, and means for reciprocating the trough longitudinally in a horizontal plane, as set forth.

2. A paper-pulp Strainer having a bottoniless trough divided by partitions into rows of spaces sloping in opposite directions longitudinally of the trough, said rows separated by a vertical partition, a screen covering the divisional spaces, a vat below said trough, and means for reciprocating the trough in a horizontal plane relatively to the sloping spaces, as set forth.

3. In a pulp-strainer, the combination of a vat to receive the screened pulp, a bottomless trough divided by partitions sloping in opposite directions, a sieve or screen covering the divisional spaces, and means for reciprocating the troughin a horizontal plane relatively to the direction of the slope of the partitions, substantially as set forth.

JAMES BISHOP. lVitnesses:

HENRY GRIsT, JOHN GRIsT.