US2569708A - Sealing strip for pulp and other types of screen plates - Google Patents

Description

Oct. 2, 1951 H, R I i DOWNS, JR 2,569,708

SEALING ST FOR PULP AND OTHER TYPES OF SCREEN PLATES Filed March 26, 1947 5 Sheets-Sheet l A TToeA/ Y Oct. 2, 1951 4 H. WJDOWNS, JR 2,569,708

SEALING STRIP FOR PULP AND OTHER TYPES OF SCREEN PLATES Filed March 26, 1947 5 Sheets-Sheet 2 LM INVN70A7 ATTO H. W. DOWNS, JR SEALING STRIP FOR PULP AND OTHER Oct. 2, 1951 TYPES OF SCREEN PLATES 5 Sheets-Sheet 5 Filed March 26, 1947 ,4 TTOEA/E Y I/VVIE/VTU Patented Oct. 2, 1951 OFFICE SEALING STRIP FOR PULP ANDDTHER TYPES OF SCREENPLATES Henry William Downs,,Jr., Lennoxville, Quebec, Canada Application March 26, 1947, Serial No. 737,398

The invention relates to improvements in sealing strips for pulp and other types of screen plates as described in the present specification and illustrated in the accompanying .drawings that form a part of the same.

The invention consists essentially of the novel features of construction as specifically pointed out in the claims for novelty following a description in detail of an acceptable form of the invention.

The objects of the invention are to provide a sealing strip for screen plates which will seal the joint between the edge of a screen plate and the wall of a vat; to devise a sealing strip which will permit easy removal orreplacement of screen plates in a vat; to provide a sanitary means of securing screen plates in a vat and render same readily accessible for washing and cleaning; to construct a sealing strip whichcan be tightened down securely on a screen plate, and at the same time, be .drawn in snugly against the wall of a vat; to devise a sealing strip which is simple in design and inexpensive to manufacture; to construct a sealing strip which has a positive lock ing device for holding same in position in a vat; and generally to provide a sealing strip which will be durable and efficient for its purpose.

In the drawings:

Figure l is a perspective fragmentary view showing a portion of the sealing strip and screen plate in an assembled position.

Figure 2 is a side sectional view as taken on the line 2-2 in Figure 1.

Figure 3 is a plan sectional view as taken on the line 3-3 in Figure 1.

Figure 4 is a detail showing a plan view of the guide memberfor the locking device.

Figure 5 is a front View of Figure 4.

Figure 6 is a side sectional viewas taken on the line 6 -6 in Figure 4.

Figure 7 is a detail showing a plan view of the adjusting bolt for the locking device. Figure 8 is a front view of Figure 7.

Figure 9 is a detail showing a plan view of the locking head.

Figure 10 is a front view of Figure 9.

Figure 11 is a side sectional view as taken on the line I ll l in Figure 9.

Figure 12 is a detail showing a plan view of the lock plate.

Figure 13 is a front view of Figure 12.

Figure 14 is a side sectional View as taken on the line M 4 in Figure 12.

Like numerals of reference indicate corresponding parts in the various figures.

1 Claim. (01. 92-30) Referring to the drawings the sealing strip consists of a longitudinal strip or strip member as indicated by the numeral 20. This strip is of a predetermined width and thickness to accommodate the locking deviceswhich are placed at intervals along the entire length of same. The strip 20 is adapted to be secured to the side wall of the vat asindicated by thenumeral 2|. The support frame or shoulder strip 22 is fitted in an elongated recess in the side wall 2| 0f the vat and suitably secured thereto, thus forming a ledge on the inner face of same. This support frame 22 provides a means of supporting the screen plate 23; the latter resting on the upper edge of same.

The side wall 2! has a plurality of cutouts or apertures 25 in same which are suitably spaced so as to coincide with the fasteningdevices 24 which are mounted at intervals in the longitudinal strip 20. A look plate 26 is mounted over each of the apertures 25 in the side wall 2| and fixedly secured thereto. The lock plate 26 is accommodated in a recessed portion around the aperture 25,thus permitting the outer face 26A ofsame to be flush with theinner face of the side wall 2|. Thislock plate has an aperture or cutout 21 which may be square or rectangular in shape with inwardly protruding edges 28 on three sides thereof. The remaining edge 29 of the aperture 21 has only sufiicient thickness for strength and the tapered or wedg shaped portion 30 extends upward and therefrom. This tapered portion is formed actually by increasing the thickness of that portion of the lock plate as it recedes from the aperture 21. The tapered portion 30 is in a parallel inclined plane with respect to the outer face 26A of the lock plate 26, thus providing a surface with which'the locking head 3| may engage.

The locking head 3| forms a part of the locking device 24 and is slidably accommodated in same. The main portion 32 of the locking head 3| has an internally threadedportion 33 extending vertically therethrough. This main portion 32 of the locking head has a pair of flanges or lugs 34 protruding therefrom. These flanges 34 form an integralpart of the main portion 32 and extend vertically the entire length of same. The lower portion 35 of the locking head 3| extends outward horizontally a predetermined distance from the main portion 32 of same, and then extends vertically upward therefrom to form a. catch, or lip portion 36. The inner face 31 of this lip portion 36 extends outward and upward from the lower portion 35 of the locking head, thus frame:223

7 providing a tapered lip which engages with the ing an elongated slot 42 in the vertical portion 43 of same. The recessed portion .39 inthe strip member 20 in cooperation with the vertical por-- tion 43 of the guide member 4| form a vertical passage having a which the locking head 3| is slidably fitted. The flanges 34 of the locking head travel in'this pair of grooves, thus maintaining same substantially in position as it slides upward and downward with respect to the strip member 20. The lip portion 36 ofthe' locking head. 3| projects through the slot 42 =in-the guidemember 4| thus beingin position for engagement-with the tapered portiontfi of the lock plate 26..

"The horizontal portion 44:of the guide member 41 rests on the upper edge of'the strip member 29 and hasa-hole 45 in'same. V The adjusting bolt 46 consists of: a threaded portion 41 which has a shoulderportion 48 formed toward the upper part of same. The upper 'end of the adjustingbolt- 46 has a square head 49 which is smaller: than the shoulder portion48 The threaded portionj'l of: the adjust! ing bolt- 46 extends through the hole '45 in the guide member 4| and engages the threaded portion 33 in the-locking head-3|. Asthe'adjusting bolt 46=:is:threaded. into the locking head 3| the'shoulder portion 48 bears 'on the upper surface of the guide member 4| thus raising the locking 'head. While-in this in:- stance the'adjustihg screw-:has a square head it could be provided with a hexagon or type of head adaptable to be turned'by-a-keywithout generally affecting the advantages of the invention. The side wall'of the vat has a-recessed portion 52 which extends above the top-level of theiaddusting bolt 46, the recesstp'roviding' necessary space for the application of a key 'or other suitaible implement to the-bolt.-

The strip member 2'li'has a recessed portion 50 along the lower edge of same, which accomrnodate the packing strip 'whichis slidablysecured therein. Thispacking strip-extends: the

*entire length of the strip member 20 and. protrudes pastthe innerface 40 of same. The packing strip 5| also extends downward a suitabledistance below the lower edge of. this strip member.

In the operatiomof the. invention the; screen plate 23 is placed in position on the: support The stripnmember 29 which accom- "modatesaplurality of locking-"devices :24 and the packing'cstrip 5| is-then-placed-in'position along -the"upper ,edge of the screen plate adjacent to itherside Wall 2'|-'of the:vat.' Theiadjustingbolts -45:-are loosened sufficiently-to allow the lip porjtiOn' 36 of: the cking. head-3| in each of the flocking devices-24 tobe insertedin the aperture 21 of the lock plates 26. The adjusting bolts 46 are'then tightened raising each of the locking heads 3|- so that. their respective lip portions 36 engage with the tapered portion 30 of each of the lock-plates 26. -As the inner face Slofthese lip portions 36-are tapered to coincide with the tapered portion 30 of the lock plates 26 the wedging pair of grooves'therein andini action forces the packing strip 5| tightly against the side wall 2| of the vat and the upper edge of the screen plate 23 simultaneously.

' It will be seen from the foregoing that a sealing strip has been designed that will provide a leak-proof means of securing screen plates substantially in position and at the same time render the latter easily removable for replacement, cleaning and the like.

What I claim is:

In a sealing strip for pulp and other types of screen plates;v a unit adapted to hold a screen plate in position on a ledge secured along the ta'chableto the wall of the vat and comprising a longitudinal member having a recess extending along the bottom. face at the inner edge thereof and apacking strip located in the recess and projecting beyond the bottom face and the inner edge of the member, thereb providing the same with two'working surfaces, andsaid-pa'cking'strip being brought'in direct contact with the top of the screenplate along its inner edge as positioncd on the supporting ledge, effectively sealing the same with respect to the top surface of the screen and with the-inner wall of the vat, locking means for maintaining said unit to the" wall of the vatover the screen plate and an adjusting means on the longitudinal member of sa'id'unit adapted to be manipulated and co-act withthe locking means for moving said unit slightly downward and inward to position said packing strip to the screen plate and against the wall of the vat, the said lockingmeans comprising a lock plate mounted on thewall'of the vat over an aperture therein, the lock plate having cutout therein three side edges of which protrude inwardly, a tapering or wedge-shaped portion being formed" on the other side of the cutout and extending upwardly, a locking head'slidably located in a recess formed'in the rear face of said longi tudinal member of said unit and having a ver tical threaded'portion andan outwardly extending and upwardly formed'lip portion adapted to engage the said'tapered' edge" of the cutout in said lock plate upon the said unit being positioned to the wall of the vat, said adjusting means consisting of a threadedbolt extending down into the recessin said longitudinal member and engaging the threaded portion-of said HENRY WILLIAM. DOWNS, JR.

REFERENCES CITED The following references-are-of record in the hit: of this patent:

Downs Feb. 4, 1941

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