USRE16969E - armstrong - Google Patents

Description

lRe. 16,969

3 Sheets-Sheet y.

. M. 4K. ARMSTRONG- APPARATUS FOR MAKING LASTEH BOARD y Original Filed March 15,. 1919 May l22, msg

j M16 22, 192s. f

M. K. ARMSTRONG .APPARATUS FOR MAKING PLASTER BOARD -3 Sheets-Sheet 2l original Filgd 'Marsh 15. 1919 l May 22, 1.928.

Re. 16,969 M. K. ARMSTRONG APPARATUS FOR MAKING PLASTER BOARD original Filed March 15. 1919l ssneets-sneet 5 Reissues] May 22, 1928.

' PATENT OFFICE.

i UNiTED STATES MORGAN I. ARMSTRONG, 0F HAMPTON, VIRGINIA, ASSIGOB, BY MESNE .ASSIGN- MENTS, TO UNITED STATES GYPSUM COMPANY.

APPARATUS FOR MAKING BLASTER BOARDQU- Original applicationled March 15, 1913, Serial No. 282,837.- Divided and application file-d July 158,

1919, Serial No. 310,471. Original No. 1,367',2$2,. dated February 1, 1921. Application for reislue led .Tune 9, 1922. Serial No. 567,205:

This inrention relates to improvements in apparatus for making plaster-board and consists of the matters hereinafter described and more particularly po-inted'out in the appended claims. 1

The disclosure ot' this applica-tion hasbeen divided from application Serial No. 282,837, tiled March 15,1919, patented August 3, 1.920, No. 1,348,387.

.The object of the invention is to produce a. simple andetiicicnt apparatus which will make in a continuous bound edge strip, a plaster board consisting of top and bottom coverings of paper and of an intermediate layer of plastic material to which the said covering sheets adhere, the edges of the layer o't' plastic material being covered and the margins of the cover sheets cemented toget/her in overlapping relation. The advantages of my improved apparatus for making 4such a plaster board, will more fully appear as l proceed with my specification,

'I he character of the invention may be best `understood by reference to one/illustrative' apparatus embodying the invention and de' signed to make plaster board having one type` of edge. p

.Such apparatus is illustrated in the accompanying drawings, inwhich:

Fig. 1 represents, diagrammatieally, a.

longitudinal section through the apparatus.`

Fig. 2 represents a. top plan view of the apparatus.

Fig. 3 represents, on' an enlarged scale, a section through Fig 2, in a plane indicated bythe line 3 3 of Fig. 2.

' Figqt represents n .partial sectional viewin a plane indicated by the line 4 4 of Fig.. 5I represents, on a still larger scale, a partial transverse section ythrough the ap* pai-atas, in a plane indicated bythe line Fig. 6 represents a. transverse section, in

' a plane indica-ted by the line 6 6A 'of Fig-2.

bottoni. sheet edge-folding or turning horns,

Fig 9 represents a top plan View` of thev Fig. 10 represents a transverse section through the finished board.

Fig. 10'1 is an end elevation of the spreading rolls, illustratingthe manner of mounting and operatively'connecting them.

The illustrative apparatus 'is arranged to make a plaster board having a specific type of edge characterized by the overlapping of the margins of one sheet by the margins of the opposite sheet which vfold over the edges 'of the body of plaster. l

Referring now in detail to that embodif ment of the invention illustrated-in the accompanying drawings 11 indicates the wider bottom covering sheet, and 12 indi Cates the narrower top covering sheet of the finished board. The respective Widths of the sheets are determined by the dimensions of th'e plaster board and the particular type of plaster board edge. Each oit' these sheets is fed from a. roll, one ot the rolls 11F being mounted on a. base or on' the Hoor below the apparatus` and the other, 12a, being mounted on suitable posts or uprights 13,A rising at the sides of the apparatus. The bottom sheet '11,' in. lits continuous advance .through theapparatus, `is supported by suitable endless belts 14 and 15, the first being located near the roll of paper 11 and at thel rear of the spreading rolls shortly to be referred to, and the other, 15, being located ;tom roll 17 is located with its top surface in the plane voif the top laps of lthe two belts 14 and 15. 4This roll is niounted in axed bearingiwhile the upper roll is mounted in vertically.adjustable bearings, so that itl is capable of a vertical adjustment to determine the thickness of the board. A familiar' crins'truction to provide this adjustment is shown in Fig. 10, wherein the rollsare shovvn with their shafts mounted in journal 2 y y f 16,969

boxes 16, 17, respectively, and with a ver- 7 tically adjustable rod 17h interposed between bottom spreading roll 17 to a space some-c.

distance to the rear of said roll. This platform 1-8 is located with its top surface in a plane tangential to the top of the roll 17 and is made wider transverselythan vthe belt 14, the top lap of which passes through a transverse slot 18 in the forward end'of- `At each side of the platform 18 and proj eeting into the space between the s )readmg rolls 16 and 17, are located mold oards 20, 20. Said-mold boards determine the width of the plastic 'body to be included between the layers vof paper, and extend parallel to each other in the direction of the feed of the paper. They are mounted with their bottom edges a distance above the top surface o'f `the platform 18, suicient to per- A- mit the thickness of the bottom sheet to pass underneath them, and are secured to said platform b means of overhanging brackets 1 attache to its edges.

The forward ends 22 of the Imold boards 20 are oHset-inwardl that is to say, toward each other, from the `plane of the main ,length of said boards, said forward ends 22 .being connected to said main' lengths by means of inwardly inclined rparts 23. The top edges ofsaid forward ends 22 are curved, as indlcated aft 24, so that they may be made to closely engagel the paper of the top sheet when it passes areund the to roll, as will presently appear. Longitudinally adjustable plates 25 are zittached to the outer faces -of the forward ends of s'aidmold boards.

l.The forward ends of themold boards themselves terminate, preferably, considerably to thlrear of the diametric vertical plane comm to the spreading rolls 16 and 17. The plates 25 may be adjusted to more closely ap roach the said diametrie plane, butas wil vappear later, these plates are never to be brought into a position forward of said L diametrie plane.

The plastic mix is disehanged upon the advancing bottom sheet 11 by means of a lt conveyer 26 suitably supported abovel the platform 18 from a hopper (not shown). A water pipe 2T is arranged to discharge water upon the plastic mix on the bottom sheet, in case more watcr is required than has already been put into'thc mix when it is delivered to the belt convcycr.y

' Operatives on either side of thc apparatus mix and roughly sp1-cad the plastic mixture over the bottom sheet and remove any hard particles that may have set and have become detached from the mold boards, a't'ter first adhering thereto. As the bottom sheet advances toward the spreading rolls, the

plastic- 'mix is crowded toward the center andis edged up by the mold boards and 1s dammed up a ainst the spreading rolls, at the same time eaving the marginal parts of the bottom sheet, -which project beyond the mold boards, free of the plastic mix.

The top-sheet 12 is fed from its supply roll 12a and then about tension rolls 28, 29, and then downwardly and forwardly about the u per spreading roll 16. sprea ing loll 16 is shorter (see Fig. 2) than the bottom spreading roll and is somewhat shorter than the width of the top sheet, but extends at ,each' end beyond the planes of the front endsof the mold boards.

The upper After the top sheet is applied, the plastic body is spread evenly as it passes with the top sheet and the bottomsheet between the spreading rolls, so that as the three parts comprising the board approach the connnon vertlcal diametric plane of the spreading rolls, t he'boar'd is in the form of a bottom Sheet having marginal parts on which there is no plastic n'iaterial,extending beyond a plastic body on said sheet, and with a top sheet applied to said plastic body having lits edges projecting .l slightly. beyond the same. Since the plates 25 do not project into the common diametric plane of the spreading rolls, wherethe'distance betwee the'rolls is least, brit terminates shortV of said plane, a little of the plast-ic mixture.v will be spread out (as the board passes bcyond the ends of the mold boards) over the marginal partsof the bottom sheet, (as shown in Fi 5), the escaping plaster being indicated y the numeral 30 andthe main" body of the plaster being indicated by the numeral 31. -By having the top roll 16 somewhat shortcr than the width ofthe top sheet, the plastic mix is prevented from collecting on the ends of said 'roll and hardening thereon.A i

The final Afolding operations take place after -both cover sheets have been applied and the plasterspread to a uniform depth. f

After the board passes the spreading rolls. the marginal parts ilof ythe bottom sheet (which will hereinafter, be referred to by the numeral' 32,) with thefsnall amount of plaster spread out t` on, are turned' over to embrace the top qs eet by`means of fold I ii'igdevres or horns conforming in' shape tothe desired contour of the plaster board edge.A

` table v33 is located lforward of the roll 1'5 (which supports the rear loop of the (nidless belt l5) with its surface in supporting engagementy with the top lap of the beit 15. vSaidA table is wider 'transversely than the-belt, and is somewhat Wider than the bottom sheet ot' the laster board. At each side of said plaster oard are mounted :folding horns 3ft of familiar construction, said horns ai' their rear endsbeing substantially ot' the cross section shown in Fig. 6,

-and at their iront ends. being of' the section shown in Fig. 'i'.4 Said horns are lmounted ininii overhanging block 35 attached to lon- 1- iiitiiilinal strips 36 Fixed at the sides of the board 3:3. The vfront end -ot' each horn, as lwill vbe seen` has its turned-o\f'er part 37 bent so that it, is somewhat inclined -from the wouter edgesot the board to and below the horizontal, as clearly shown in Fig. 7. As the board is drawnforward, the marginal partsy inlet. the bottom sheet are caught by the rear ends ot' the horns and said parts 32 with the plaster 30 are bentV or turned over upon the top sheet, the lseveral successive stelni of 'tiie turning in lf`ig.-i 5, ti and 7.

.lhe turning over ot the marginal parts 32 with the plaster thereon, acts to depress the marginal parts .38 of the top sheet, as clearly shown in Fig. 7. thus leaving a substantiulfbody of plaster between the adjacent process being indicated parts of the top sheet and of the turned over margins et' the bottom sheet.

In order to facilitate this turningr over of `the bottom sheet, I provide means for' soften ingir the marginal parts of the bottom sheet preliininarily to their reaching the folding horns.-tliis because since the paper is sized `and stiff. 1t wiltnot readily accommodate itiseltl 4to the action of the vfolding horns u n less treated 1n some suchv manner. To this end I provide in aposition'near the rear end of the platform 18, steam pipes 40 which are [adapted to discharge jets of steam o'n said marginal edges and thus soften them. To .prevent buckling or bending upward of the plaster board or of thetop weight on the top sheet and being prevented fronrmoving forwardly with the advancing.

plaster board b v means ot' a bar v42 which .extends outwardly beyond the platform 33 and is engaged against the upright posts 13.

As the plaster board passes beyond the folding horns, tliereis apt tobe a slight excess of plaster at the edges ofthe turnedover marginal parts oli' thebottom sheet (See ,is attached a sheet of the plaster board, during the action of the fielding horns, an anti-buckling plate 41, 'which is narrower than the top sheet 12,.is placed to bear on the top of the plaster oard, said plate simply resting by its Fig. '7). To remove this plaster and to smooth down any that `remains in this position, I provide narrow rolls 44, one or more for each margin of the board. Said rolls are mounted on a shaft/15 to the end of which ulley 46. This pulley is connected up to i rive the rolls 44 ii a direction opposite to the advance of the board so that.

they will in effect act as brushes to removeof the board.

.After leaving the rolls 44, the boardis' passed under a'weighted ironing or smoothing inembelt, This is in the form ot a' plate which may be' attached to cables 49 passing over pulleys -50, so thatfit may be lifted out'of the road when threading the niachine. Said'ironing ofsmoothing member is wider than the plaster board, so that itfextends beyond both edges of said board. -It is lprevented trom'advit'ncin'g and moving forward with the board by means of chains 5l which are attached toAthe upright posts 13. The said ironing meniber, as the name applied to it suggests, irons out and smooths any wrinkles or buckles that appear or tendto form in the plaster board, and finally 'flattens the board `and adheres the paper sheets to the plastic layer as the'plastic layer approaches or reaches a set condition.

Although the apparatus above described was arranged for making a plaster board having a specific arrangement ot' cover sheet margins, it is obvious that it may be arranged to manufacture different types of plaster board edges by suitable adjustments.'

Obviouslythe invention is not limited to the particular detailsof construction of they Moreover, 1t is notillustrative apparatus. u indispensable that all features of the invention be employed conjointly as they may be used-to advantage in various combinations and sub-combinations.

' I claim:

1. An apparatus for making plaster board of the kind described, coniprising means for continuously advancing and supporting a bottom sheet, means for depositing a plastic mixture on said bottom sheet, vertically 'spaced spreading rolls interposed in the path of the advancing bottom sheet, one of said spreading rolls-being adjustable with reference to'theother to determine the spacebe-i tween 4them, and the otliervof saidvspreading rolls being in the plane in which said ibottom sheet is advanced, means for feeding a top sheet about said adjustable spreading roll in a plane above themeans supporting said bottom sheetpmold boards in -advance of said spreading rolls spaced above the support for the bottom sheet sufficiently to permit the marginal edges of said bottoni sheet to project beyond said 'n1old boards, said mold boards heilig adapted for confining the plastic mixture disposed upon the advancing bottom sheet, said mold' boards ha ving ends adapted for engagement with the top spreading roll and having ends terminating short. of the common vertical, diametric plane of said spreading rolls'plates adjustable to e ten-d into the space between said spreading rolls folding horns located at each side of the support for the bottom sheet, adapted for `folding over the marginal parts of said bott-om sheet, means coacting with the'support for the bottom sheet to prevent buckling during the folding-over process of the bottom sheet. and an ironing device adaptedy to flatten the board and adhere' the covering sheets to the plastic body in advancing tlie board.

2. An apparatus for making plaster board of the kindvdescribed, comprising means for above the 'marginal partsv of'said bottomA tically adjustable,

said mold boards continuously advancing a' Ibottom sheet, means for deposlting a plastic mlxture on said sheet, mold boards spaced inwardly and.

above the marginal parts of said bottom sheet, to confine the plastic mixture on the middleof the sheet between said marginal parts which are left bare and exposed, vertically adjustable.,l spreading rolls, in the path of the advancing bottom sheet, means for feeding a narrower top sheet about the top spreading roll, said mold boardsliavingends adapted for engagement with the top roll, and terminatingshort of the vertical plane of said'rolls, folding horns for turning over the marginal parts of the bottom sheet onto the margins of the narrower top sheet, after leaving the spreading rolls, and an ironing device for smoothing the product and adhering thetop and bottom sheets'to the plastic mixture.

3. An apparatus for makingplaster'board of the kind described, comprising mea-ns for continuously advancing a bottom sheet, means for depositing a plastic mixture o n said sheet, mold boards spaced inwardly and sheet, to confine the plastic Vmixture on the middle 'o f the sheet, between said marginal parts whlch are left bare and exposed, verlspreading rolls,

y -in the path of the advancing bottom sheet, means'for feeding a narspaced top` and bottomv spaced top and bottomA parts of the ybottom sheet 'onto the marginalf parts of the narrower top sheet, after leaving the spreading rolls, means supporting said top and bottom sheets with the plastic mixture between them, after they have passed the spreading rolls, a device coacting with said supporting means and engaging the top sheet between said folding horns for p `spaced inwardly and above the marginal parts of said bottom sheet, to confine the plastic mixture on the middle of the sheet between said marginal parts which are left bare and exposed, vertically adjustable, spaced top and bottom spreading rolls, vin the path of the advancing bottom sheet, means for feeding a narrower top sheet about the top spreadingroll, said mold boards having ends adapted for engagement with the top roll, and terminating short of the vertical plane of said rolls, folding horns for turning over the marginalparts ofthe bottoml sheet onto the margins of the narrower top Y sheet, after leaving the spreading rolls, and an 'ironing device for. smoothing the product and adhering the top and bottom sheets to the plastic mixture. t

5. An apparatus for making plaster board -of the kind described, comprising means for continuously advancing a bottom sheet, means for depositing a plastic mixture on said sheet, mold boards spaced inwardly of the marginal parts of said bottom sheet, tocontine, the plastic mixture ybetween said marginal parts which are left bare and exposed, spaced spreading rolls in the path of the advancing bottom sheet, means .for feeding a narrower top sheet between said rolls, said mold boards constructed and arranged to permit a small amount of plaster to flowupon themargins of said bottom sheet, and folding. devices for turning` over the margi vnal parts of the bottom sheet onto the'margins--of the narrower top sheet, after leaving the spreading rolls.

6. An apparatus for making plaster board of the kind described. comprisingmeans for continuously advancing a bottom sheet,

lmeans for depositing a plastic mixture on rowe'r top sheet about the top spreading roll, E

engagementwith thetop roll, and erminating short of the vertical plane offs id rolls, oldlng vhorns for turning over the mzrginal having ends adapted I for said sheet, mold boards spaced inwardly of the marginal parts of said bottom sheet to confine 'the plastic mixture on the middle ofthe sheet between said marginal parts,

spacedv spreading rolls in the path of the ad- 1 vancing bottomshee't, means for feeding a narrower top sheet betteen said rolls,said mold boards having ends terminating short of the rolls and adjustable to vary the amount of plaster flowing upon the margins, folding devices for turning over the marginal parts of the bottom sheet onto the marginal parts ot the narrower toprsheet after leaving'the spreading rolls, and Wheels revolving in a direction opposed tothe travel ot the board for removing any excess plaster upon the top sheet adjacent the folded margins.

7` An apparatus for making plaster board .of the kind described, comprising means for continuously advancing a bottom sheet. means for softening the marginal parts ot said bottom sheet, means for depositing a plastic mixture 'on said sheet, means tor -coniinin the plastic mixture to the middle ot the sieet leaving marginal parts which are substantially bare, spreading rolls, in' the path of the advancing bottomA sheet, means for feeding a top sheet between said rolls and folding devices tor turning over the marginal parts of the bottom sheet onto the margins of the narrower top sheet.

8. In an apparatus for making plaster board, the combination of a conveyor for carrying and supporting a cover-sheet, means for depositing plastic material on the sheet, means for applying a second cover-sheet to the/plastic material and for spreading said plastic material to form a board ot uniform thickness, means for causing a small amount of plastic material to flow upon thel margins of one sheet, and means located beyond said spreading means for folding the margins of the Wider sheet into a plane substantially parallel with the other sheet so as to bring the corresponding marginsy of said sheets in superposed relation and cementing the same together with the small amount. ot plaster.

9. In an apparatus of the class described, the combination of a conveyor, means for sunny a sheet ot covering material thereto, means tor rendering the margins of said sheet more lexible so as to fold more readily, means for depositing plastic material upon said sheets, means for applying a second cover-sheet-over said plastic material, and means for folding thereafter thermargins ot said first sheet into a plane substantially parallel to said second sheet so that the corresponding margins of said sheets are superposed. 4

10. In an apparatus for mal-:ing plaster board. the combination of means tor advancing a bottom cover-sheet, means for depositing plastic material on the sheet, means for supplying a top sheet to said lplastic material, a pair ot' spaced spreading rolls between Which lsaid sheets and plaster pass, means for applying a small amount ol plaster to the margins ot' one. of said sheets, tolding horns for folding` said margins upon the margiilsl of the other sheet and means 'tor pressing said n'ia'rgins down upon said other margin 11. In an apparatus for making plaster board, the combination ot means for advancing a bottom cover-sheet'. means for depositing plastic material on the sheet, means for supplying a top sheet to said plastic material, a pair of spaced spreading rolls between which said sheets and plaster pass., means for applying a smallamount oi plaster to the margins of the bottom sheet, vtolding horns for folding said margins upon the -margins of the top sheet and means for cleaning ofi1 the top sheet adjacent the folded margins.

l2. In an apparatus tor making plaster hoard, the combination oi means for adv-ancing a bottom cover sheet, means for-depositing plastic material on the sheet, means for supplying a top'sheet to said plastic material, a pair ot spaced spreading rolls between which said pass, means fortolding said margins upon the margins of the top sheet and a device revolvini in a direction opposed to the travel of the from the top o the board.

MORGANK. ARMSTRONG.

.fill

sheets and plastic material oa'rd for removing. excess plaster

Images