US723257A - Suction-box for paper-machines. - Google Patents

Description

" No. 723,257. .PATENTED MAR. 24, 1903.

H. FAIRBANKS.

SUCTION BOX FOR PAPER MACHINES. APPLIoATIoN FILED sBPT.12,`19o2.

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SUGTION BOX FOR PAPER MACHINES.

APPLIoATIoN FILED SEPT. 12. 1902.

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Nb. 723,257. PATENTED MAR. 24, 1903.

' H. PAIRBANKS.

SUGTION B0X POR PAPER MACHINES.

APPLICATION PILED`SEPT.12, 1902.

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No. 723,257. PATENTED MAR. 24, 1903.

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APPLICATION FILED SEPT. 12, 1902.

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No. 723,257.- PATENTED MAR. 24, 1903. Y H; PAIRBANKS.

SUGTION B0X FOR- PAPER MACHINES APPLIOAflION FILED SEPT; 12, 1902.

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UNITED STATES PATENT @trice HENRY FAIRBANKS, OF ST. JOHNSBURY, VERMONT.

` SUCT|ONBOX` FOR PAPER-MACHINES.

SPECIFICATION forming part of Letters Patent N o. 723,257. dated March 24, 1903.

Application iiled SeptemberrlZ, 1902. Serial No. 123.124. (No model.) 4

To a/ZZ whom it may concern:

Be it known that I, HENRY FAIRBANKS, of

St. Johnsbury,in the county of Caledonia and State of Vermont, have invented certain new 5 and useful Improvements in Suction-Boxes for Paper-Machines, of which the following is a specification.

The object of my invention is to provide a carrier supporting the traveling Wire or felt apron of a paper-machine where it must be exposed to the pressure of the atmosphere and where inthe ordinary arrangement `it drags heavily across the open top of the suctionboxes into which the wateris drawn from the layer of wet pulp.` ,l

The object and the method of operation of the suction-boxes under the apron of the Fourdrinier paper-machine or of the wet ina.-` chine are well known, and upon this apron there is usually'a pressure of between fty and one hundred pounds for every inch in width of the machine or of several tons on the whole apron, which, being dragged under this pressure,.wears very rapidly, while the power required to carry itis excessive.'

My present invention provides a mechanism which has the same effect as though the top of the suction-box moved with the-pulpcarrying apron and while the exhaust action is exerted over the Wholevwidth of the machine, as in the ordinarysuction-box, yet reduces the amount of surfaceloaded by the unbalanced pressure of the iatmosphere to a narrow longitudinal opening, where the carrier connects with the suction-box below. To accomplish this, I connect the exhaust-pump with a long box running lengthwise of the machine and midway between its sides, this box having a long opening at the top and some width of fiat surface ou each side of this opening to secure an air-tight connection With'the carrier moving over it. This carrier consists of a series of long boxes reaching fromV side to side of the machine, each one perforated over its top, where the traveling apron rests upon it, and otherwise closed,

l except at the bottomywhere is an opening registering with the opening inthe top of the These boxes of the carrierare hinged together, so as to form in their highest position a continuous plane surface perforated throughout, on which the traveling pulp-carrying apron rides without sliding, while the sliding motion under the unbalanced pressure of the atmosphere is limited to the area of their -contact with the top of the narrow suction-box below. These boxes which make up this carrier are tted with elastic packing on their sides, so that the exhaust action is practically continuous over the whole surface of contact with the pulploaded apron above, and there is very little leakage of air.

'Referring now to the drawings,. Figure l showsin side elevation an embodiment of my invention applied under the apron of a papermachine. Fig. 2 is a plan .view of the same with various parts broken away to show the interior parts. Fig. 3 is a side View in section on the line x3 m3 of Fig. 2. Fig. 4 isl au end view, partly in section, on the vline :r4 :r4 of Fig. l. Fig. 5 shows in perspective a part of the traveling carrier. Fig. G shows in perspective the suction-box detached.

" Inthe embodiment of my invention here illustrated, A indicates the suction-box longitudinally under the center of the machine, as shown in Figs. 3 and 4and by dotted lines in Fig. 2. This suction box carries crossbea'ms D D, sliding in tracks D D', allowing a slight Vcrosswise movement as fthe bar d, which'connects these cross-beams, is carried by the wavy grooves L L, which its ends engage Yin the rollers H H, over which the traveling carrier turns at the ends of its travel. This slight crosswise -motion is sufficient to cause the top of the suction-box and the connecting parts of the boxes of the carrier above to' wear at and not in grooves, and the airtight connection will not be impaired. These rollers l-I H are connected by the bevel-gears e' e on the shaft E and carry the series of boxes with perforated tops forward in contact with the wire apron and down and back underneath, as is clearly illustrated in Fig. 3, where, as also in Fig. 5, the hinged connection ff g g of these lboxes F F is shown. The drawings also illustrate .howther openings G G G in the bottoms of the boxes F F F register with the long .opening Cinthe'suction-box A, bringing their interiors into free communication with the exhausting apparatus through the conduit a, which is arranged with a sliding joint to allow the slight cross- IOO wise motion of the suction-box A already described. This snction-box A may have the opening in its top bridged across at K under the dandy-roll, if it proves desirable.

It is clear that the exhaust through the conduit a, the suction-box A, and the boxes of the carrier F F F will act through the perforated upper surfaces of these boxes and the wire apron over them upon the pulp layer as far as these boxes move in contact with the suction-box and that the surface over which the exhaust action is exerted may be made very great, being limited vonly by the room which the construction of the paper-machine allows under the wire apron, and as the atmospheric pressure causes friction between the "moving and longitudinally-stationary parts only where the boxes of the carrier slide over the top of the suction-box below them and as this surface of contact is narrow it is apparent that the power required is comparatively small, and this is communicated through the strong parts of the machine, and the traveling apron is relieved both of strain and the wear of sliding.

While I regard the form here described as embodying my invention as the best form, I would not limit myself absolutely to it in all its details.'

Having described my invention, what I claim, and desire to secure by Letters Patent, 1s-

1. The combination with the traveling apron of a paper-making machine and a suction-box having openings narrower than the width of the pulp-bearing apron, of an endless carrier passing between and in contact with this apron and this suction-box; said carrier composed of a series of boxes connected together by hinged joints, each box extending across the width of the apron and having a foraminous top, and otherwise closed during a part of its movement, except as it is in contact with the top of the said suction-box, as described.

2. In a paper-making machine, in combination, the traveling, pulp-bearing apron, the suction-box arranged lengthwise of the movement of this apron, and the endless traveling carrier interposed and establishing connection between the apron and the suction-box, vthis carrier made up of a series of boxes hinged together, these boxes having foraminous tops and openings through their bottoms in position and size adapted to register with the opening in the top of the said suction-box, substantially as herein set forth.

3.- In a paper-making machine, an endless carrier composed of boxes reaching across the machine and hinged together, the series carried by two rollers, and forming in their highest position a continuous supporting-sur face under the pulp-bearing apron, and adapted to move with it, the top of each box being finely perforated, and the bottom having an opening registering with the opening in the top of a suction-box placed underneath, and connected with an exhaust, as and for the purpose set forth.

4. In a paper-making machine, in combination with the pulp-carrying apron, an endless traveling carrier, composed of boxes hinged together with suitable elastic packing between, the series carried by two rollers, and forming, when passing across the top, a plane supporting surface under the said apron, and adapted to move with it, these boxes having finely-perforated tops and openings in their bottoms registering with the longitudinal opening in the top of a long suction-box, and together covering and closing that opening against the admission of air,

HENRY FAIRBANKS.

Witnesses:

FRED M. NEwooMB, MARION FAIRBANKS.

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