US946185A

US946185A - Pulp-screen.

Info

Publication number: US946185A
Application number: US51802309A
Authority: US
Inventors: Lucius S Williamson
Original assignee: Individual
Current assignee: Individual
Priority date: 1909-09-16
Filing date: 1909-09-16
Publication date: 1910-01-11
Anticipated expiration: 1927-01-11

Description

L. S. WILLIAMSON.

PULP SCREEN.

APPLICATION FILED SEPT. 16, 1909.

Patented Jan. 11,1910.

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PULP SURF-EN.

APPLICATION IILED SEPT. 16, 1909.

946, 185, Patented Jan. 11, 1910.

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' UNITED STATES PATENT OFFIQE.

LUCIUS S. WILLIAMSON, OF LOCKLAND, OHIO.

PULP-SCREEN.

To all whom it may concern:

Be it known that I, LUoIUs S. WILLIAM- SON, a citizen of the United States, residing at Lockland, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Pulp-Screens for Use in Screening the Pulp in Paper-Making, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

My invention relates to improvements in the construction of the slotted plates used as screens in straining the pulp in the manufacture of paper, and the object of the invention is to provide screen plates and means for securing them in place, whereby the screens may be readily and easily removed and replaced for cleaning or changes in paper stock or otherwise, and in which the necessity for the use of screws to hold the plates in place is entirely obviated. As now used these screen plates must fit accurately into the frames and be secured so as to be water tight, and it is customary to fasten the plates in place by a large number of screws. Vith each change of the paper stock, and also frequently for cleaning, it is necessary to remove the screens from the frames. This is a long and tedious operation, and in addition the screws and screw holes are subject to injurious wear, the screws loosen and work out with consequent leakage, or the screws become rusted in the place and the slotted heads damaged, and great difliculty is frequently experienced in freeing the plates for removal.

My invention is designed to overcome these difficulties, and it consists of that novel construction of a screen and the method of securing the same, to be hereinafter pointed out and claimed, whereby each pair of plates is locked in place by a cam lever to be released instantly, ancl in which the use of screws is entirely obviated.

In the drawings Figure 1 is a perspective view of a portion of the frame with several screen plates in place and one removed. Fig. 2 is a longitudinal section of the construction shown in Fig. 1; Fig. 3 is a perspective view of one of the screen plates. Fig. 1 is a perspective view of a portion of the retaining frame to which the plates are secured. Fig. 5 is a perspective View of the cam lever.

1, 2 and 3 are the sides and ends of the wooden framework or box, in which the Specification of Letters Patent.

Application filed September 16, 1909.

Patented Jan. 11, 1910. Serial No. 518,023.

screens for straining the pulp are located. Tl'llS box 1s also provided with cross pieces 1, 1, separated from each other the width of one of the screens, the screen plates them selves usually being a foot in width and three and one-half to four feet in length, while the box is constructed to hold as many screens as may be desired.

5, 5 are metal screen plates provided with

transverse slots

6, 6, for the passage of the material, and with the longitudinal rib 7 for strengthening purposes.

The plates are secured in the box as fol lows: Mounted securely within the wooden box along the sides and ends, and on the cross pieces 4, is a metal frame made up of end strips 8, 8 and side strips 9, 10, with cross bars 11. These strips are tenoned and mortised so as to fit tightly together at the ends where they are securely fastened to the framework by screws, a single screw at each corner, and at the ends of the cross bars being required, while at short intervals other screws are employed to rigidly secure this metal frame in place. The end bars 8 and the cross bars 11 are provided at short intervals with beveled forwardly projecting

lugs

12, 12 and 13, 13, while one of the side strips.

9 is formed with a longitudinal undercut dove-tailed recess 14, and the opposite side strip 10 is formed with a dove-tailed recess 15. Each screen plate 5 is formed at one end with a corresponding dove-tailed tenon 16, to engage the recess 14;, and with a beveled surface 17 at the other end to engage the recess 15. The plates are also provided with

mortises

18, 18 on the under surface along the side edges to engage the

lugs

12 and 13. The transverse bars 11 are wide enough to engage a pair of the screen plates, so that when the plates are located in the box they will fit tightly together along the side edges. Pivoted on

suitable screw bolts

19, 19, mounted on the plates 20, secured to one of the sides of the box frame are the cam levers 21, provided with the cam surface 22, which engages in the slot 28, formed at the abutting edge of each pair of screen plates.

It will be evident from the foregoing description how readily and easily my screen plates can be located in and removed from the pulp box.

The dove-tailed tenon 16 of each plate is slipped within the mortise 14 and the plate pushed to its seat in the frame with the

lugs

12, 13 engaging the recess underneath the plate, and the plates are arranged in pairs with the recess 23 contiguous and the lever 21 being thrown over to the right, each pair of plates is rigidly and securely locked in place, to be released as readily by turning the cam lever to the left. The cam surface on the cam levers is constructed so as to force the plates downward and away from the lever, so that the plates are rigidly locked in place. In order to permit any sediment to run out and be readily removed from the recess let, the portions are cut away at 2%, 2st, at the ends of the strips and at the tenons of the transverse strips.

Having thus described my invention what I claim as new and desire to secure by Letters Patent, is:

1. In a receptacle for straining paper pulp, with metal strips secured along the inner bottom edges, the side strips provided I with longitudinal mortises and the transverse strips with tenons, metal screen plates correspondingly mortised and tenoned to engage the mortises and tenons of the metal. strips, with levers to lock the plates in place.

2. A receptacle for straining paper pulp, with metal strips secured along the inner bottom edges, and with intermediate cross strips, the side strips provided with longi tudinal mortises and the transverse strips with forwardly projecting tenons, and metal screen plates correspondingly mortised and tenoned to engage the niortiscs and tenons of the metal strips, with cam levers to force and lock the plates in place.

3. A receptacle for straining paper pulp, metal strips secured along the inner bottom edges, and with intermediate cross strips, one of the side strips provided with a longitudinal undercut dove-tailed mortise, with a, longitudinal dove-tailed recess for the opposite side strip, and the transverse strips formed with forwardly projecting tenons, and metal screen plates correspondingly mortised and tenoned to engage the mortises and tenons of the metal strips, and with cam levers pivoted to the sides and engaging said screen plates to force and lock them in place, with a groove in each pair of screen plates with which the cam levers engage.

LUCIUS S. WILLIAMSON. Vitnesses lVILLIAit C. Dmronnr, MAX ADDLEMAN.