US1718890A - Apparatus for constructing plaster wall board - Google Patents

Description

' June 25, 1929.

C. R. BIRDSEY APPARATUS FOR CONSTBITJTINGPIIASTER WALLBOARD 2}}. 1922 4 Sheets-Sheet 1 Filedjugf INVENTOR. Charles I? Birds:

A TTORNE Y.

JEhe' 25, 1929. R, BIRDSEY 1,718,890

APPARATUS FOR CONSTRUCTING PLASTER WALLBOAHD Filed Aug. 25. 1922 4 Sheets-Sheet 2 III N fi

' INVENTOR.

Charles R. Birds A TTORNE Y.

June 25, 1929. Q BlRDsEY 1,718,890

APPARATUS FOR CONSTRUCI'ING PLASTER WALLBOARD Filed Aug. 23. 1922 i 4 Sheets-Sheet 3 INVENTOR.

& 3 I Cirar/es E Bir'as r By MJM ATTORNEY.

June 25, 1929. C BIRDSEY 1,718,890

APPARATUS FOR CONSTRUGTING PLASIER WALLBOARD Filed Aug. 23. 1922 4 Sheets-Sheet 4 INVENTOR. Char/es 6. Birds A TTORN E Y.

Patented June 25,

UNITED STATES PATENT OFF! CHARLES R. BIBDSE Y, HINSDALE, ILLINOIS, ASSIGNOB TO UNITED STATES GYP- SUM COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION 01' ILLINOIS.

APIQARATUS FOR CONSTRUCTING PLASTEB WALL BOABD.

Application filed August 28, 1922. Serial No. $83.79!.

This invention relates 'to improvements in the production of building materials and in particular to an apparatus and method of constructing. wall board, particularly designed to construct the plaster wallboards described in my Patent N 0. 1,428,624 of September 12, 1922, and which with but slight changes and without departing from the original invention is adapted to producing the in plaster wallboard as disclosed in my prior -Patent N 0. 1,406,967 of February 21, 1922.

Since it is old in the art to produce plaster wall board of this general character on a continuously operating apparatus which usually includes a continuous belt conveyor extending from the wet end, or board forming portion, a distance to allow the plaster material to partially set and bond to the fibrous covering so that at the end of the conveyor the strip of plaster board so formed may be cut in uniform lengths, removed and transferred to the drying kilns, it is only necessar to illustrate andv describe in this application, the particular construction of the board forming mechanism at the wet end of the apparatus.

While the preferred forms of apparatus for carrying out the method described herein are illustrated upon the accompanyin sheets of drawings, yetit is to be understoo that minor detail changes may be made therein without departing from the scope of the invention.

In the drawings: 7

Figure 1 is a view partly inside elevation and partly in lon itudinal 'vertical section through the board orming apparatus, as contemplated in this invention.

Figure 2 is a top plan view of the Figure 1 with parts broken away and removed.

Figures 3, 4 and 5 are transverse sectional views taken on the lines 3-3, 4-4 and 5-5 respectively of Figure 1.

Figure 6 is a detail top plan view and Figure 7 is a detail view in side elevation and partly in section of a portion of the construction shown in Figures 2 and 1, respectively.

Figure 8 is a view in transverse section on the hue 8-8 of Figure 4.

Fi ure 9 is a perspective view of the wall boar shown in view on Figure 8.

Figures 10 and 11 are views similar to Figures 8 and 7, respectively, illustrating another modified form of that apparatus to produce a slightly modified form of plaster wallboard.

Figure 12 is a diagrammatical enlarged perspective view illustrating the mode of application of the sealing strip on the type of wallboard produced by the apparatus illustrated in Figures 10 and 11.

Figure 13 is a view similar to Figure 12 illustrating a slightly modified apparatus for applying the sealing strip above the flat surface of the wallboard.

The ap aratus illustrated by the first eight figures o the drawings is designed to produce the wallboard disclosed in my said Patent N 0. 1,428,624 and shown in perspective in Figure 4 of this patent, from which it is seen that a single cover sheet of fibrous material is employed to embrace the plaster core or body of the board by folding the margins at both sides of the cover sheet about the longitudinal edges of the board and bringing the folded portions together butnot in overlapping re ation upon the opposite surface ofthe plaster body, the edge portions of said sheet being secured together by a sealing or sheet 3 of fibrous material from a roll 4 supported preferably below the table on an extension thereof. This cover sheet is of sufficient width so that'when the side margins are folded over-the laster body of the completed board the on itudinal edges will overla each other. e cover sheet is advance from its roll to the conveyor on the table and before passing to the table the sheet preferably passes beneath two scoring devices 5 which produce lines of reduced thickness in the sheet parallel to each other, which lines are arranged in pairs the distance between each pair of lines being equal to the thickness of the completed board and the distance between the innermost lines of the two pairs bein equal to the width of the completed board.

hese scoring devices are so arranged that the margins '6 and 7 along the longitudinal edges outside the scored ines will overlap at the edges when folded about the completed board. As the cover sheet advances on the conveyor the margins are engaged by pick up and folding members 8 arranged on each side of the table which are adapted to engage the p the .folde 'tudinal edges of the board under side of the margins and gradually bend them upward to a perpendicular osition along the innermost scored lines as s own in Fi res 3 4 and 5. It is preferable to provi d a holding roller 9 on the upper side of the central portion '10 of cover sheet between the innermost scored lines slightly beyond the point where the pick up and folding members engage the margins to insure the bending of the margin along these scored'lines and also insure the central portion of the sheet contacting with the conveyor.

It is preferable to deposit the plaster body of theboard upon the central portion of the cover sheet approximately at the point where the margins are caused to assume the perpendicular position by the pick up and folders as illustrated in Figure 5. The plaster body 11, preferably of calcined gypsum, with or without aggregates, is deposited in plasticv state preferably from a belt conveyor 12 as illustrated. Beyond this point the pick ups and folders impart a bend to each margin of the coversheet along the outermost scored lines on each side, as illustrated in'Figure 6, and then bring these margins downward upon the upper surface of the plastic mass as shown in Figure 2. The longitudinal edges of the covering sheet abut each other, and are'secured together by a joining strip 20. The advancing of the plastic body completely embraced by the folded cover sheet then causes the partially formed board to pass beneath a forming or pressure roll 13, which is of the same width as the completed board and which imparts to the partially formed board the desired thickness of the completed board? To insure rectangular squared edges the completed product it is preferable to provide vertical belts 14 on each side of the forming roll passing over vertical pulleys 15 contactin with the longibeing formed. After leaving the forming roll 13 the board passes on to a conveyor 16 of great length as previously described and only partially illustrated in these drawings. If desired, the vertical edge engagin belts 14 may be continued a distance along t is second conveyor.

The sealing or joinin strip 20 is supplied from a roll 21 mounte above the partially formed board which strip is led between the pick up and folding members 8 and applied to the upper surface of the plastic body 11,

so that as-it passes under the forming roll 13 it will en a e*the underside of the edges of narily the forming (roll will exert enou h pressure to cause sufiicient of the plastic b0 y to enter between upper surface "of the strip of the edges of the margins to bond the edges to the strip in the completed board. However, if desired, silicate of soda or other bonding substances may be applied tothe upper surface of the strip before the margins are own margins 6 and 7. Ordi folded over it, as shown by the device 22 in Fi re 1, to insure the complete sealing.

s shown in Figure 9 the longitudinal edges of the folded over margins meet at the longitudinal center of the board and are secured 'to each other on the underside by the sealing strip between them which is depressed into the body of the board and presents a flat surface on that side of the completed board.

' When desired to apply the sealing strip on the exterior of the board, as shown in Fig. 3 of my said patent No. 1,428,624, it is on necessary to apply this sealing strip after'margins of the cover sheets have been brought together and, as shown in Figures 10, 11 and 12, the strip 20 may be applied by passing it over the board forming pressure roll 13. In this case, it is preferable to apply silicate of soda or other'bonding solution to the underside of the sealing strip before it is passed above the pressure roll.

As seen in Figure 12, the sealing strip 20 a plied in this manner will depress the edges of the folded over margin into the plastic body 11 and as the pressure forming roll is cylindrical throughout, the surface of the finished board on the side of the sealing strip will be completely flat.

If it is desired to apply sealing strip 20 without depressing the edges of the overla ped margins, as shown in Fig. 2 of my said patent, that portion of the pressure forming roll over which the sealing strip passes may be provided with an indentation 23 equaling in width and depth the width and depth of the sealing strip as shown in Figure 13.

What I claim is:

1. An apparatus for constructing plasterboard comprising means for advancing a fibrous cover sheet of sufficient width to completely embrace the finished board, means for folding up the margins of said cover sheet, means for depositing plaster body in a plastic mass upon the cover sheet, means to fold down the u turned mar n upon the lastic mass with t e edges of t e margins a jacent one of the other, means for applying a sealing strip of fibrous material covering the adjacent edges of the margins, and board forming means, including a pressure roll arran ed to apply the folded over margins on the astic mass and cover the adjacent edges wit the sealirlg strip. 2. n apparatus for constructing plasterboard, comprising means for advancing a fibrous cover sheet of suflicient width to completely embrace the finished board, means for folding up the margins of said cover sheet, means for depositing the plaster body in a plastic mass upon the cover sheet, means to fold down the upturned margins upon the plastic mass with the edges of the margins adjacent one to the other, means for applying a sealing strip of fibrous material adapted to cover the adjacent edges of the margins upon the plaster body after the folding down of said margins, and board forming means including a pressure roll arranged to apply the folded over margins upon the plastic mass to cover the adjacent edges with the sealing strip.

3. Apparatus for constructing plasterboard comprising means for advancing a fibrous cover sheet of sufficient width to completely embrace the finished board, means for folding up the margins of said cover sheet, means for depositing the plaster body in a plastic mass upon the cover sheet, means to fold down the upturned margins upon the plastic mass with the edges of the margins adjacent one to the other, means for applying a sealing strip of fibrous material covering the adjacent edges of the margins, means for providing adhesive between the cover strip and the portions of the margin covered there- 7 by, and board forming means including a pressure roll arranged to apply the folded over margin upon the plastic mass, and cover the adjacent edges with the sealing strip.

4. An apparatus for constructing plasterboard, comprising means for advancing a fibrous cover sheet of sufficient width to completely embrace the finished board, means for folding up the margins of said cover sheet, means for depositing the plaster body in a plastic mass upon the cover sheet, means to fold down the upturned margins upon the plastic mass with the edges of the margins adjacent one to the other, means for applying a sealing strip of fibrous material covering the adjacent edges of the margins, and a bord forming means including pressure roll arranged to apply the folded over margins on the plastic mass to cover the adjacent edges with the sealing strip, and to press the strip in the plastic body so the board on that face, provides a fiat surface.

5. An apparatus for constructing plasterboard, comprising means for advancing a fibrous cover sheet of sufficient width to completely embrace the finished board, means for folding up the margins of said cover sheet, means for depositing the plaster body in a plastic mass upon the cover sheet, means to fold down the upturned margin upon the plastic mass with the edges of the margins adjacent one to the other, means for applying a sealing strip of fibrous material covering the adjacent edges of the margins on the exterior thereof, and board forming means including a pressure roll arranged to apply the folded over margins upon the plastic mass and cover the adjacent edges with the sealing strip.

6. An apparatus for constructing plasterboard, comprising means for advancing a fibrous cover sheet of sufficient Width to completely embrace the finished board, means for folding up the margins of said cover sheet, means for depositing the plaster body in a plastic mass upon the cover sheet, means to fold down the upturned margins upon the plastic mass with the edges of the margins adjacent one to the other, means for applying a sealing strip of fibrous material covering the adjacent edges of the margins of the exterior thereof, and board forming means, including a pressure roll arranged to apply the folded over margins upon the plaster mass and cover the adjacent edges with the sealing strip, and to press the portions of the margins under the sealing strips so that the board on that side provides a flat surface.

CHARLES R. BIRDSEY.

crnrirlcma or CORRECTION. a

as." No. 1,718, 890.

Granted June 25, 1929, to

CHARLES R. BIRD SEY.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1, line 49, for "Figure 4" read "Figure 7"; page}, line 114, claim 1; for the word "of" read "to"; page 3, line 39, claim 4, for the misspelledv word "bord" read "'board"; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 10th day of September, A. D. 1929.

'(Seal) M. J. Moore, Acting Comissioner of Patents.

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