US1308724A

US1308724A - Plastee-board lath

Info

Publication number: US1308724A
Authority: US
Publication date: 1919-07-01
Anticipated expiration: 1936-07-01

Description

J. scHuMAcHEH.

PLASTEB BOARD LATH.

Arma/mou man mmm-|919'. Panted July l, 1919.

2 SHEETS-SHEET l.

I. SCHUMACHER.

PLASTEH BOARD 11TH.

APPLICATION FILED MAR. 8.1919, 1,808,724. Patented Ju1y1,-1919. 2 EEEEEEEEEEEE 2.

by Mw M ma@ H A bis Azza-cys JOHN scnUMAcHEn, or Los ANGELES, catwoman. y

PLASTEB-BOARD LATH.

To all whom-t may concern.'

Be it known that I, J oHN SCHUMACHER, a1 Y citizen of the United States, residing at Los Angeles, in thel county of Los Angeles andv State of California, have invented nevsrr and .y

' useful Improvements in Plaster-Board Lath,

of whichthe following is a specification.

This invention relates to an improved article'of manufacture, and a method of producing the same. It pertains more particularly to an article known as plaster board lath used in buildingconstruction as a substitute for wire or wooden lath.

It is an object of this invention to prov1de an improved article ofmanufacture consisting of such plaster board or lath which will I be superior in simplicity of structure, in

durability and length of life..

Lath of the character described is made by in'f'zasing within surface strips or sheets of pap per a` plastic composition of suitable plastic material which is initially a moist unstable substance. This plastic material sets, adheres to the sheets, and forms a vhard board.

Such plaster board is often used to produce the finished wall surface with suitable decorations applied thereto. In accordance with 'I the present invention, the plaster board-1s converted into laths by so' forming it that plaster may be applied thereto .to complete lthe Walls surface, and the board is so con structed that the applied plaster is grippedby the plaster board and anchored thereto.

In the manufacture of such plaster board, as ordinarily vcarried on, it is difficult to prevent warping of the product due to unequal shrinkage and expansion of the component parts, and unequal resistance to the strains produced thereby. In accordance with this invention, the board is `so constructed as to prevent such warping. Another object of ,this invention is to provide a novel and eiiicacious method of making such board.

-, The above mentioned objects and other objects as will appear from the description, are' susceptible of being ca ried out by means of the mechanism illustri ted in the accompanying drawing, in which:

Figure lis a side elevation, partly in sectionV of apparatus suitable for carrying out the steps of the process; Fi 2 is a plan' view taken on the line 2 2 of ig. 1 ;.and Fig. 3 is a 'diagrammatic view in perspective of lthe means shown in Figs. 1 and 2 for pro' ducing the board'. .l

Broadly thefimshed article shown herein specification of Lea s Patent.

' Patentedauly 17, 1919.

Application led March 8, 1919. Serial No. 281,433.

comprises a board having parallel dove tail mortises therein, as best shown in- Fig. 3. The initially finished board is shown at the right of Fig. 3. The board is made by continuously feedin pliable surface paper and interposing there etween a plastic substance.

During the advance of the paper one sheet thereof is corrugated toprovlde thel mortises. The mortises in thelr initial shape, in-

. dicated by a in Fig. 3, have 'parallel side walls which are not undercut. A fullness is, however, providedin 'the corrugated piece so that upon fiattening the same, av pitch is given to the side walls of the mortise to form a dove tail, as indicated by A. This fullness is indicated by a hump b. It is evidentl that the uncorrugated piece C in drying will shrink and place a tension on -that side of the board,'while the corrugations on the surface sheet D would permitstretcliing without tension, and therefore, warping would occur, unless means is provided to prevent the same. lThis I accomplish by inserting adjacent the-surface D a numberl of strips of paper E to act a'stension means while drying holding the top-layer of the board under` the sametension whiledrying as the bottom, and thereby 'preventing warping. The surface sheets are fed continuously, theupper sheet D passing between a pair of corrugated rollers'forming .mortises a and lnunps b onthe upper surface between the mortises.y The board advances passing beneath a iattening'roller G, which lattens the hump b, thereby forcing over the pitch and forming the dove tails A. v

Referring more particularly to Figs. 1

side Walls of the mortises, givingl them a and 2, a complete machineforcarrying out the process is shown. A plastic composition 'nsv supply means is indicated generally byI 4.

Mounted thereabove is a plaster mixing means indicated by 5. Paper supply rolls are designated by 6 and 7, and paper strip rolls by 8. The means for corrugating the upper surface paper is indicated generally by 9, and the flattening roller mechanism by 10. The means for advancing and conveying the plaster board is indicated generally by 11. The cars carrying trays for receiving the initially finished plaster board are indicated by 12.

The plaster composition supply meansy 4.- comprises a hopper 14 mounted u on a suitable frame wor 15- and provi ed with a spout 16, the discharge from Whichis conrolled by al gate The spout 16 dis? charges plaster upon the paper supplied .from paper roll-.dat the receiving end of thc advancing means 11. l

^ The plaster mixing means preferably comprises a mixing trough 18 and revoluble ymixing blades 1 9 fixed to arotatable shaft driven byv suitable means.

The trough is journaled so that it may be'tilted to discharge the contents thereof into the hopper,

and a handle 20 is provided on the trough,

whereby the trough may be tilted. A water supply pipe 21 for feeding water to the mixing trough is controlled by a suitable valve. v

The paper supply roll 6' is journaled upon a Shaft supported by the frame work 22 and preferably below the level of the upper surface of the advancing means and at the receiving end thereof.

The paper supply roll 7 is similarlyl mounted upon a shaft'supported by a subcorrugating rollers.

frame 23, preferably above the advancing means 11. Both rolls 6-and 7 are mounted in accordance with. the usual practicel in mounting large rolls of paper.

The roll of strips of paper 8 is mounted :upon a.. shaft journaled in brackets secured -to the frame work 1-5.

sa..V

- by 9 in Figs. 1 and 2 and more specifically The corrugating rolls indicated generally .byE andy F in Fig. 3 are disposed below the,roll 8 and intermediate rolls 6 and 7. f .A'llhe corrugating rollers are preferably hollow,l as indicatedin Fig. 3, so that they may be heated to 'better press the corrugations into the paper. .These Vrollers are mounted upon shafts journaled -u'pon the frame work 1-5.

Each corriigating roller has a gear secured to one end thereof indicated by 24A and 25. These gears mesh and positively drive the Means `may be provided forI adjusting` the distance ofthe lower corrugating roller above the upper surface of the advancing means 11, and thereby adjusting the thickness of the plaster board being produced. e

The advancing means 11 comprises a conveyer belt 2'6` passed over rollers 27 and 28 having shafts journaled upon the ends of the frame workv 29. A table 30 isformed to properly support the belt.

A motor 32 for driving the machine is belted to a drive wheel 33 mounted 0n the which consists in interposiiig and is geared by a, chain 4,3 to a sprocket wheel 44 ixedly secured to the shaft carryp ing the upper corrugating roller F.

It is obvious that all the parts moving the compone-nts of the plaster board are posifrom the hopper onto the lower sheet of surface paper C between guide boards 45 and 4&6. The conveyer belt carries the strip C forward and with it the plaster, passing under the lower corrugating roller. Referring particularly to Fig. 3, the up er surface sheet D in corru ated form is ed forwardly, the plaster ing spread by the lower corrugating roller. Strips E are fed between the sheets C and'l). Corrugating roller F has teeth of peculiar formation engaging openings in roller F. The sides of the teeth are parallel, and the tops are provided with humps B conforming to corresponding depressions in the openings von roller F. It will be noticed that the sides,

tops-and bottoms of the teeth meet in sharp edges. rIhese 'edges break the sheets of paper D as it passes between the rollers for a purpose later described. rlhe plaster board advances from the corrugating rollers with mortises having parallel 'side walls and the top surface of the boards between rollers having humps b. The humps are Hattened by the roller G. Due to the 'break of the paper at the edges or the junctures of the walls ofthe morti'ses, the side walls of the latter tilt or pitch to form dove tails A. The strips4 of paper E are parallel to the vsurface sheet C and embedded in the plastic material. These strips prevent distortion of the upper sheet 'D when the humps are being flattened.

As before stated the plaster board is cut into suitable lengths and is delivered at the discharge end of lthe conveyei-,upon trays mounted upon a car 12, by which it is transported to points where the other, usual steps in the process of vmaking plaster board are carried out.

` Having thus disclosed myinvention, what l claim and desire to secure by Letters Patentis:

` 1. The process of making plaster board, which consists in interposing between sheets of pliable material a plastic substance, one of said sheets being'corrugated and having a fullness on its surface at the extending said surface by removing said fullness, whereby the sides of said grooves are pitched.

2. The process of making laster board, Ween sheets of pliable material a plastic substance one of said sheets being cori-uga and having aiis ooves; and

fullness in its outer surface between the Grooves; and extending said outer surface I y removing said fullness, whereby the sides of said grooves are pitched.

3. The process of making plaster board, which consists in inter-posing between sheets of pliable material a plastic substance, one of said sheets being corrugated and having undulations in its outer surface between grooves; and flattening said undulations, whereby the sides of said grooves are pitched.

. 4. The process of making plaster board, which consists of forming mortises having broken edges in a. sheet of pliable material, said sheet having a fullness in its surface at the grooves; interposing between said sheet and another sheet plastlc material; and extending said surface by removing said fullness, whereby the sides of said grooves are pitched.

5. The process of making plaster board, which consists in formin mortises having broken edges in a sheet o pliable material, said sheet having a fullness in its outer surface between corrugations; interposing between said sheet-and another sheet of pliable materi'al a plastic substance; and ex-.

tending said outersurface by removing said fullness, whereby the 'sides of said grooves are pitched.

6. The process of making plaster board, which consists in forming mortises havin broken edges in a sheet of pliable materia said sheet having undulations in its outer surface between mortises; interposing between said sheet and another sheet of pliable material a plastic substance; and flat- 4tening said undulations, whereby the sides of said grooves are pitched.

7. The process of making plaster board,

which consists in interposing between a flat sheet of pliable material and a corrugated sheet of pliable material a plastic substance; intel-posing between said sheets and adjacent said corrugated sheet tension strips of shrinking characteristics like said fiat sheet to prevent warping of said board.

8. The process of making plaster board, which consists in interposing between a flat sheet of pliable material and a corrugated sheet of pliable material a plastic substance; and interposing between said sheets and adjacent said corrugated sheet tension strips of the same materlal as said flat sheet to preventwarping of said board.

9. The process of making plaster board, which consists in interposing between a flat sheet of pliable material and 'a corrugated sheet of pliable material a plastic substance, said corrugated sheet having a fullness in `its outer surface between the grooves; interposing between said sheets and adjacent said corrugated sheet tension strips of shrinking characteristics like said flat sheet; and eX- tending said surface by removing said fullness, whereby the sides of said grooves are pitched.

10. The process of making plaster board,

. which conslsts of interposing between a fiat sheet of pliable mater1al and a corrugated sheet of pliable material a plastic substance,

said corrugated sheet having undul-a-tions therein; interposing between said sheets and adjacent said corrugated sheet tension strips of shrinkin characteristics like said flat sheet; and liatten said undulations, whereby the sides of said groove are pitched.

In witness that I claim the foregoing I have hereunto subscribed my name this 26th day of February, y1919. i

' JOHN SCHUMACHER.