US70534A - Improvement in the manufacture of suction-boxes for paper-making - Google Patents

Description

@uiten tetes. @stent ffice' FRANCIS CURTIS,` OF NEWTON, MASSACHUSETTS.

Letters .Patent No. 70,534, dated November 5, 1867.

dige Stlgrhnle nfrrrct in in ilgrs rtirs 332mm mit mating pnt nf tige sane.

TO ALL WIIOM vI'l MAY CONCERN:

Be it kiiewn that I, FRANCIS CURTIS, of Newton, in thc county of Middlesex, and State of Massachusetts, have made an'invention of a new and improved Manufacture of Suction-Boxesfor Paper Machinery; and do hereby declare thetfollowing to be a full, clear, and exact description of the same, due reference being had to the drawings accompanying and making part of this specification, and in which- Figure 1 is a longitudinal section, and I' Figure 2 a transverse section of the suctionbox constructcd'in accordance with my invention.

My present invention relates tothe suction-box of a paper machinethe construction and operation of which is well known and understood by those at allconvcrsant with the manufacture of paper by the Fourdrinicr machine, it being an oblong rectangular box, provided with a foraminous or perforated top, upon which the'endless Wire-cloth apron, carrying the pulp, travels, a vacuum being created within the box for the purpose of causing a. suction or draught upon and through the pulp, andextracting the water therefrom; the object of the invention being to produce a vacuum-box which shall withstand the action of water or chemicals, be durable and light, and capable of'bcing manufactured at reasonable cost. As the construction of these vacuum-boxes forms no part of my invention,wl1ich consists in the material of which they are composed, an elaborate description of them is not considered necessary. l

- The material now generally employed in their manufacture, and to which there have been few exceptions, is Wood, with a metallic tophon account of its cheapness partly, but principally on account of its lightness, as the box must frequently be removed from thc endless apron and from the machine. 4Boing constantly covered and partially Jfilled with water, the wood swells and expands in dilerent directions, frequently causing them to leak, and always rotting them rapidly. In addition to this the friction or abrasion between the metallic top of the box and the wire-cloth apron tends to wear out both rapidly.

In my invention, which, as before stated, consists in constructing the box and its cover of hard rubber, all these objections are obviatcd. Tile box so made is water-tight, and unchangeableat all times and under all circumstances, is comparatively indestructible, and is suliiciently light; It has also been found in practice that the Wear between its top plate and the endless wire cloth is very much less than in the old mode of construction, thus greatly economizing the cost of the wire cloth, which is one of the heaviest items of expense in the manufacture of'paper. t

In the drawings above referred to, the box is shown at A as composed of hard-rubber plates, properly joined and screwed together; the shelves for supporting the slidingl vacuum-heads a a being shown at 6 6, and the foraminous top of the box at c, the general construction and operation of the box'beir-ig similar to those in common use. y

I claim the improved manufacture of suction-box as composed Wholly or in part of hard rubber, substantially in manner and for the purpose as before described.`

FRANCIS C RTIS.

Witnesses:

FREDERICK CURTIS, Onis. H. GRIFFIN.

Images