US1514827A - Apparatus for constructing plaster board - Google Patents

Description

Nov. 11,

C. R. BIRDSEY APPARATUS FOR CONSTRUCTING PLASTER BOARD Filed Oct. 6. 1921 Patented Nov. ll, 192d.

tense? FATENT FWQE.

CHARLES R. BIRDSEY, OF HINSDALE. ILLINOIS, ASSIGNOB T0 UNITED STATES GYPSUM COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

V APPARATUS FOR CONSTRUCTING- PLASTER BGABD.

Application filed October 6, 1921. Serial No. 505,849.

To all whom it may concern:

Be it known that I, CHARLES R. BIRDSEY, acitizen of the United States, residing at Hinsdale, in the county of Du Page and State of Illinois, have invented certain new and useful Improveme'ntsin Apparatus for Constructing Plaster Board, of which the following is a description.

My invention belongs to that general class of inventions relating to the manufacture of plaster or wall board, and relates particularly to the method and apparatus for constructing an improved board.

The invention has among its objcctsthe production of an improved board and an improved method of constructing the same.

The invention has among its further objects the production of a simple, efiicient, durable and sati factory apparatus for carrying out the method herein described.

Many other objects and advantages of the construction herein shown and described will be obvious to those skilled in the art from the disclosures herein given.

To this end my invention consists in the novel construction, arrangement and combination of parts herein shown and described, and more particularly pointed out in the claims.

In the drawings, wherein like reference characters indicate like or corresponding parts;

Fig. l is substantially a view in elevation and partly in section, illustrating one form of the apparatus suitable for carrying out the method;

Fig. 2 is a sectional view taken substantially on the line 2-2 of Fig. 1;

Fig. 3 is a sectional view taken substantially on the line 33 of Fig. 1;

Flg. 4 is a swtional view taken substantially on the line H of Fig. 1;

Fig. 5 is a sectional view taken substan tially on the line 55 of Fig. 1;

Fig. 6 is a sectional view through a.

portion of a board constructed by a slightly modified apparatus;

Fig. 7 is a sectional view corresponding to Fig. 4, illustrating the modified apparatus;

Fig. 8 is a perspective view of one type of completed board, with a portion broken away to show the construction, and

Fig. 9 is a similar view of another type with the edge of one sheet raised to show the construction.

- and 9 and 10 the cover sheets.

and with the apparatus herein illustrated,

itbeing understood, however, that the method and apparatus may be employed for constructing'boa-rd of any type of overlapping cover sheets, which sheets are to be secured together. The board shown consists of a body of plastic material, such as gypsum, plaster or the like, it being understood that any equivalent for the prt'posemay be employed which is enclosed or covered by a covering of suitable material, paper or the like being generally preferred for the purpose.

In the type of board shown in Fig. 8, 1 represents the plaster body and 2 and 3 the cover sheets. With the particular type 0t board herein illustrated, sheet 2 is turned over the edge 4, generally at both opposite edges of the board, with the extreme edge '5 at each .side bent or folded over so as to overlap the extreme edge of the cover sheet 3 and bod of the board disposed between the cover s eets. The cover sheets are suitably secured together, as will be hereinafter referred to. With the type of board illustrated in Fig. 9, thesame is substantially similar to the board shown n Fig. 8, except that the cover sheets are arranged in a different overlapped relation. Referring to this figure, 8 represents the plaster body In this case the cover sheet 9 is folded up, as at 11, at the desired edges'of the board and thence over 12, the extreme edge of the cover sheet 10 being arranged on the exterior of the flap or folded over portiony12.

Heretofore it has been customary to make plaster board and seal, bind or seems the sheets together by means of the plastic material itself forming the body, the same serving to fasten the edges together where they overlapped. In the present case I stick or secure the overlapping paper cover sheet material together byemploy'mg an independent sticking or securing mfimm. Thus ticular medium may be as desired, for example, silicate of soda, ordinary rice-flour paste and glue are some of the mediums that may be'employed. 3

In the ire-wings, I have intimated the sticking medium or securing means as applied in a series of dots or spots 15, it being understood that the same may be continuous or in a series of breaks, and in such quantity as to secure the desired result.

Referring to Fig. 1, 16 represents a suitable support as shown, the same being in the form of a belt conveyor carried by the. rolls 17, the particular type of support, however, is not necessarily limited to a moving belt type, such as is shown. The conveyor or support 16 supports the cover sheet 2, the same being of the desired width and preferably, but not necessarily, scored ,or indented, as indicated at 19 and 20 to produce the desired form of edge. The other cover sheet 3 is fed down and passes under the roll 18, the material 1, such as plaster or stucco of the desiredmixture, being deposited, in the case illustrated on the sheet 2 in advance of the roll 18, so that as the paper sheets and lastic mass pass under the roll 18, the board 1s gauged and made the desired th ckness as well as width. I have not considered it necessary to herein .illustrate in detail the mixing of" the batch and applying of the same to the machine, as any of the satisfactory methods now employed in the industry 1 may be employed with the machine herein shown. For illustration, 13 represents a conveyor for supplying the batch of material. There is preferably provided side folders 21, which are constructed to support the edge portions 45 of the under sheet in advance of the roll 18, and preferably in advance of the point where the material is applied to the sheet, so that the sheet itself forms a'trough confining the material and to a large extent assists in shaping the board as the material may flowout to the edge and it may be so fedonto the sheet that there is sufiicient material for the purpose and. yet not a surplus. It will be noted by referring to Fig. 3 that the upturned edge portion 5 is brought substantially close to the end of the roll 18, the sheet 5 being preferably but not necessarily a width to fit or extend substantially to the edge portion 4 of the lower sheet; After this type of board has been substantially formed in the manner mentioned and while the edge 5 is still maintained up, the sticking or securing medium 15 is deposited or applied to one or the other of the sheets before the edge is turned down.

In the mechanism illustrated I have applied the paste or sticking medium to the sheet 3 at a point adjacent the edge, so that it will be within the confines of the board edge and the extreme free edge of the portion 5 when it is folded over. The sticking medium in the case illustrated is applied by means of a container 22, having a discharge nozzle 23,24= being a valve or the like for controlling the rate of discharge. The sticking medium may be. fed by gravity or force feed, as desired.

After applying the paste, the edge portion of flap 5 is then turned down and it is not only found desirable to turn it down, but generally preferred to also maintain it in contact with the. sheet 3 until the paste,

glue or sticking medium has set. The folding member 21 may be constructed to turn over the portion 5, or any equivalent means applied for the purpose herein. As shown, there is provided a roll 25, under which the board passes after the portion 5 has been turned down, so thatif the portion 5 turned down is started under the roll, it will automatically follow under the roll and be turned down by the roll. I

In the type of machine illustrated in Fig. 1, I have provided two rolls, 25, 27 ,26 being a belt extending over the same and arranged to cooperate with the board passing thereunder. There may also be provided one or more rollers 28, or the equivalent, which maintain the belt against the board. It may be mentioned that, if desired, rolls 29, orany equivalent therefor, may be provided at the side edges so as to maintain the same asdesired, and also to gauge the width of the board so as to produce a uniform product. While a square edge is shown, this is immaterial, as the edge may be shaped in any desired manner, and this may be controlled, as desired, by varying the scoring previously referred to, as well as by modifying the shape of the rolls 29, or the equivalent if provided.

As illustrated, I have so arranged the parts that the flap portion 5 will be turned down and pressed slightly inwardly so that the outer face of the board is substantially flush from edge to edge.

The type of board illustrated in Figs. 6, 7 and 9 is substantially similar, except in this case the flap portion 12 is turnedinwardly and over the material 8, and the edge portion of the sheet 10 maintained up or supported until the sticking means is applied. In the apparatus illustrated, the member 31 forms the two functions of maintaining the member 12 asv shown, and at the same time maintains the edge portion of the sheet 10 in such position that the sticking medium may be applied. The particular apparatus for applying the sticking medium is similar to that shown, 34 representin a container, conduit or the like, provided with the nozzle 35 arranged to discharge paste 15 in the desired manner on the inturned flap 12. After the paste 'is applied, the edge portion of the upper sheet is permitted to drop over the flap 12; the rollers previously mentioned function in the same manner as described.

It will be seen from the preceding that other sheet.

once I do not wis misses as the paper is fed into the/machine and the plaster or stucco, or the equivalent, applied thereto, the board is shaped, the sheets being maintained in position to permit the ap? plication of. the sealing compound and thence the sheets folded, pressed together andmaintained in contact until the com pound has set suficiently to maintain the sheets together. The board is shaped and dischar ed from the machine in the proper size an form, and may be cut into lengths,

as desired. It will be noted that, if desired, one edge may be formed in one manner and the other in the opposite way, orgequivalent or desired manner.

Having thus described my invention, it is obvious that' various immaterial modifications may be made in the same without dearting from the 's irit of my invention; E h to be understood as limiting myself to the exact form, construction, arrangement and combination of parts herein shown and described or uses mentioned.

What I claim as new and desire to secure by Letters Patent is:

1. An apparatus for making plaster board in a continuous process, comprising means for sup-porting and advancing a cover sheet, means for bending up an edge thereof, means for covering said sheet with plaster, means for'tadvancing a top cover sheet over said plastered sheet, means for supporting the free edge of one of said sheets out of contact with said plaster, means for applying adhesive substance adjacent te the free edge of the other sheet, and means for overila ping said supported edge of the one sheet L 2. *An apparatus for making plaster board 1n a continuous process, comprising a traveling table adapted to receive and support a cover sheet thereon, means for bending up opposite edges of said sheet, means for coverlng said sheet with plaster between the bent edges and enclosing said plaster, means for applying a second cover sheet over said plaster on said bottom sheet, means for holding the edges of one of said sheets out of contact with said plaster, means for applying adhesive to the exterior surface of the edge of the sheet in contact with said plaster, and means for. thence overlapping the inner surface of said edge held out of contact over the exterior of said ad hesively treated edge.

3. An apparatus for making plaster board in a continuous process, comprising means for supportin an advancing cover sheet, means for ben ing up an edge thereof, means for covering said sheet with plaster between said bent up edges, means for advancin a top cover sheet over said plaster and ower sheet, means for maintaining the edge of one of said sheets out of contact with said plaster, and simultaneously applying adhesive substance to the exterior surface ofthe edge of the other sheet, and means for overlapping said edge maintained out of contact with said plaster over the adhesively treated edge.

In testimony whereof, I have hereunto signed my name in the presence of two subscribing witnesses. 1

CHARLES R; "BIRns Y.

out of contact with said plaster 'over Witnesses:

and onto the adhesively treated edge of the Roy W. HI L, RUTH M. EPHRAIM.

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