US774966A - Pulp-screen. - Google Patents

Description

PATENTED NOV. 15, 1904.

H. J. DIGKERSON.

PULP SCREEN. APPLIOATIOE FILED JULY 30. 1903.

N0 MODEL.

PATENTED NOV. 15, 1904.

H. J. DICKERSON.

PULP SCREEN. APPLICATION FILED JULY 30 1903.

NO MODEL.

2 SHEETS-SHEET 2.

NRY J Dun/555 WITNEEEEE umwzcm L113 Kud/ mmaw HTTUHNEY UNITED STATES Patented November 15, 1904.

PATENT OFFICE.

PULP-SCREEN.

SPECIFICATION forming part of Letters Patent No. 774,966,

dated November 15, 1904.

Application filed m 90,1903. serial No. 167,608. (NomodeL) To all whom it may concern.-

Be it known that I, HENRYJ. DICKERSON, a citizen of theUnited States,residing at Niagara Falls, in the county of Niagara and State of New York, have invented certain new and useful Improvements in Pulp-Screens; and I do hereby declare the followingto 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, reference being had to the accompanyingdrawings,

and to figures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in pulp-screens, and more particularly to that class of construction for which Letters Patent No. 585,656 were granted to me on the 6th day of July. 1897. The basis of such construction was a pulp-screen consisting of a frame provided with longitudinal cleats, transverse movable supports resting upon said cleats, dovetail plates secured to said movable supports, corrugated plates engaging with said dovetails, and set-screws threaded through said frame and forcing all of said movable supports and plates to place upon the line of said corrugation simultaneously, for the purpose set forth.

The objects of my present invention are, first, to provide an all-metal vat and screenplate frame for the sake of increased rigidity and durability, and, second, to provide anovel and improved arrangement and construction of parts whereby the insertion and removal of the screen-plates in and from their frame are greatly facilitated.

To these ends my invention consists of a certain arrangement and combination of parts, all of which will be fully hereinafter described and claimed.

In the drawings, Figure 1 is a top plan view of my improved vat complete. Fig. 2 is a similar view with the hinged side walls of the vat removed. Fig. 3 is a vertical section taken in the line 00 m of Fig. 1. Fig. 4 is a rear elevation. Fig. 5 is a vertical longitudinal section of the vat with the screen-plates removed. Fig. 6 shows two forms of screenplates in transverse section. Fig. 7 is afragmentary end in perspective of one of the tightening-plates. Fig. 8 is a perspective view of one of the movable supports for the screen-plates. Fig. 9 is a perspective view of one of the sliding holders for the movable supports. Fig. 10 is a perspective view of a fragmentary end of one of the movable supports seated in its sliding holders, and Fig. 11 is a perspective view of one of the uniform parts of a sectional screen.

Referring to the drawings, it will be seen that the four sides 1 of the upper frame of the pulp-vat, forming the upper walls thereof, are formed of channel-iron or its equivalent, which permits of the upper flanges 2 and the lower flanges 3. A non-corrosive lining 4:, preferably of copper, extends over the top flanges 2, the inner vertical face of the channel-iron, and under the lower flanges 3, as clearly shown in Fig. 3. The lower screenplate frame is similarly formed of channeliron 5. which is similarly covered with acopper lining 6. The upper frame is hinged at 7 7 to the lower frame, and when closed a packing 8 (see Fig. 3) is interposed between the flanges 3 of the upper channel-iron and the flange 9 of the lower channel-iron and compressed by the clamps 10, (see Fig. 4,) which forms a tight joint.

7 Along the lower inside edges of two opposite walls of the screen-plate frame are secured the holding-up side ledges 11 11, which are inclosed within the continuous copper lining 6, as clearly shown in Fig. 3. It will also be seen (see Fig. 3) that the sides of the upper frame extend outwardly a short distance beyond the sides of the lower frame, thus forming a holding-down shoulder for the screenplates. which, acting in conjunction with the holding-up ledges 11 11, serve to form a tight receptacle for the ends of the screen-plates.

12 12 are the end tightening-plates, having their inner edges provided with the angular grooves 13. (See Fig. 7.) The ends of these tightening-plates 12 have the extensions 1 1 14, provided with sockets 15. Registering sockets 16 16 are secured to the lower frame. Through these registering sockets are passed the screw-bolts 17, which with the nuts 18 serve to force the tightening-plates 12 into operative position.

IOO

19 represents the movable supports, the ends of which rest upon the side ledges 11 11. These supports are made reversible by having the upper set of opposite angular grooves 20 20 and the lower set 21 21. (See Fig. 8.)

Sliding holders are provided for the ends of the movable carriers, which consist of the back 22. (see Fig. 9,) the two vertical parallel walls 23 23 forming a socket for the reception of the end of the movable support 19, and. the beveled side wings 24L 2 1. These supports slide along the ledges 11 11 and serve to hold the movable supports 19 in operative position. I have shown in the drawings two forms of screen-plates, of which 25 is the style of corrugated plate shown and claimed in my patent hereinbefore mentioned. The other form, which is an improvement, is shown at 26, and consists of a metal plate 27, (see Fig. 6,) having on its under side a series of spaced inverted-V-shaped grooves 28, extending nearly through the plate, and spaced transverse slots 29, cut through the plate at the apexes of the grooves 28.

In Fig. 11 I have shown a single bar of a sectional form of screw-plate, which is presented in its entirety at in Fig. 2. This bar has a flat rectangular upper face 31, its ends being provided with oppositely-placed side lugs 32 32, the side walls of the bars having included converging faces 33 33. A series of these bars when assembled form practically the style of screen-plates shown at 26, with the additional advantage that when a portion of the sectional plate becomesinoperative one or more of the bars may be renewed, the balance remaining, while in the case of the form shown at 26 the entire plate must necessarily be renewed.

The side edges of all of the screen-plates are beveled, as shown at 34, Fig. 5, to enable them to have holdingengagement with the grooves 13 in the tightening-plates 12 and the grooves 20 and 21 in the movable supports 19.

In assembling the parts for operation the screen-plates are placed in engagement with the upper grooves of the intermediate movable supports and the grooves of the end tightening-plates, and by turning the nuts 18 a practically rigid screen is formed the entire length of the frame. The end screw-braces 35 35, which pass through the walls of the lower frame and the intermediate brace 36, engage in the lower grooves 21 21 of the intermediate movable supports 19 and serve to increase the structural rigidity of the screenplates.

By means of the all-metal construction of the pulpvat, which constitutes a most importantfeature of my invention, the screen-plates are provided with a lirmer foundation than the wood of the old form of vat, which is springy and yielding. Consequently the screenplates will yield much less to the suction of the screen in the all-metal construction.

too, the wood in the old form of vat is constantly rotting and staining the product in its passage therethrough, while in my improved all-metal construction, which is practically indestructible, the deterioration of the product is entirely avoided, and there is nothing present to stain the most delicate tints of paper. The solidity of construction, the-plates being held as in an iron vise, eliminates a large percentage of the vibration which obtains with the old wood construction, which tends to greater efliciency in the working of the screen.

My improved construction and arrangement permits of easy and rapid manipulation in assembling the parts for operation, as well as in dismantling for the purpose of renewing any of the parts when necessary.

\Vhere the channel-iron which forms the side walls of the vat comes together, forming joints, I-prefer to bolt or rivet thereto pieces of angle-iron, with packing interposed to form water-tight joints.

I claim- 1. A metal pulp-vat in which the screenplates are removably secured. the inner walls of which are covered with a non-corrosive metal lining, as and for the purpose stated.

2. A pulp-vat comprising a lower flanged metal frame in which the screen-plates are removabl y secured,an upper flanged metal frame forming the upper walls of the vat and hinged to the lower frame, the inner walls of the two frames being covered with a non-corrosive metal lining, a packing between the abutting flanges of the two frames, and a series of clamps for tightening the abutting flanges against the interposed packing to form a tight joint, as and for the purpose stated.

3. In a pulp-vat, the combination with the screen-plate frame having side ledges, the end grooved tightening-plates and the intermediate movable supports grooved at top and bottom and resting upon the side ledges of the frame, of the removable screen-plates having beveled side edges adapted to fit within the grooves of the end tightening-plates and the upper grooves of the intermediate movable supports, and the end screw-braces adapted for engagement with the lower grooves of the intermediate movable supports, as and for the purpose stated.

a. In a pulp-vat, the combination with the screen-plate frame having side ledges, the end grooved tightening-plates the intermediate movable supports grooved at top and bottom and resting upon the side ledges of the frame,

and the sliding holders for the ends of the intermediate grooved supports, of the removable screen-plates having beveled side edges adapted to fit Within the grooves of the end tightening-plates and the upper grooves of the intermediate braces adapted for engagement with the lower grooves of the intermediate movable supports, as and for the pur- Then, l pose stated.

5. In a pulp-vat,the reversible movable supports for the screen-plates, such supports being provided at top and bottom with opposite longitudinal grooves, as and for the purpose stated.

6. In a pulp-vat,'the combination with the reversible movable supports for the screenplates, such supports being provided at top and bottom with opposite longitudinal grooves of the sliding holders for the ends of the movable supports, as and for the purpose stated.

7. A pulp-vat comprising a lower flanged metal frame provided with holding-up side ledges, on which the screen-plates rest, and an upper flanged metal frame forming the side walls of the vat, such side walls extending inwardly a short distance beyond the sides of the lower frame, forming a holding-down shoulder, between which and the holding-up side ledges, the screen-plates are secured, as and for the purpose stated.

8. A pulp-vat comprising a lower flanged metal frame provided with holding-up side ledges, on which the screen-plates rest, and an upper flanged metal frame hinged to the lower frame and forming the side walls of the vat, such walls extendinginwardly a short distance beyond the sides of the lower frame, forming a holding-down shoulder, between which and the holdingup side ledges, the sereen-plates are secured, as and for the purpose stated.

9. In a pulp vat the combination with a lower flanged metal frame provided with holding-up side ledges on which the screen-plates rest, and an upper flanged metal frame forming the side walls of the vat, such walls extending inwardly a short distance beyond the sides of the lower frame, forming a holdingdown shoulder, between which and the holding-up side ledges, the screen-plates are secured, of the end grooved tightening-plates, the intermediate grooved movable supports resting upon the holding-up side ledges, the removable screen-plates adapted to fltwithin the grooves of the end tightening-plates, and the intermediate movable supports, as and for the purpose stated.

10. In a pulp-vat the combination with a lower flanged metal frame provided with holding-up side ledges on which the screen-plates rest, and an upper flanged metal framehinged to the lower frame and forming the side walls of the vat, such walls extending inwardly a short distance beyond the sides of the lower frame, forming a holding-down shoulder, between which and the holding-up side ledges the screen-plates are secured, of the end grooved tightening-plates, the intermediate grooved movable supports resting upon the holding-up side ledges, the sliding holders for the ends of the intermediate grooved movable supports, the removable screen-plates having beveled side edges adapted to fit within the grooves of the end tightening-plates, and the intermediate movable supports, as and for the purpose stated.

In testimony whereof I have signed my'name to this specificati on in the presence of two subscribing witnesses.

HENRY J. DICKERSON. Witnesses:

C. B. BUTLER, W. 'I. MILLER.

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