US1271787A - Manufacture of perforated metal for drainage-casings, screens, &c. - Google Patents

Description

AfsMHH, as orY PERKFQRVATED Mem FOR DRAINAGE CASINGS, SCREENS, m;

MANUFACTU -1Ai PLlcAT|0N FAILED 1u LY23.' I QMfMNEwED pic. 5, 1917.

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' MANUEAGTRE or r'EnroEATED METAL Eon DRAINAGE-memes, SCREENS, ac.

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Specification' of Letters Patent.

Application med imite-,1914, serial No. 852,654. 'Renewed remember 5., 1917. serial No. 205,685.

Be it. known that Ip, ANDREW SMITII, a citizen ofthe United States','residing at San Mateo, in the' county f of San Mateo andh 'State of California, have invented certain new and useful Improvements in the Manu- 'facture of Perforated Metal for Drainage- Casings, Screens, &c., of which the -followin'g lis a specification.

This'dnventicn relates to the manufacture ofv perforated metal `plates or sheetsl which are especially'adapted ffon use in making clasingsffor. drainage purposes, such' aswell curbing for lining-oil and water wells, til-j ing, culverts and also for screens and-,strainfill prefer to employ a series of 'sets organgs of .tools which vfollow in succession,` each ers .in various arts, etc.

The main purpose' of my invention-iste provide perforated metal sheetsor plates l having smooth-walled slots or openings of any desired width-.from the narrowestslit.

and to facilitate the manufacture of such plates. A furth'e'rlobject is to provide a process of manufacturing `slotted-plates in which the apertures .'may.v be cut bythe use of gangs of planing or milling toolsv or other cutting implements.v i 'p For the purpose of clearly:A disclosing this invention reference is made to the accompany-ing drawing in'which-Figure 1 is a cross-section'showingthe edge or thickness of a metal 'sheet Fig. 2' is the same after being corrugated; Fig. 3 is a A perspective view of the corrugated plate; `shoviving the manner of cuttingtheslotsby means of successive gangs of tools; llig. 4 isa longitudinal section of the 'slotted-J plate after the A corrugations havev been pressedback into theplane of the sheet; Figs. 5' and 6,v arev ,smooth casing is desired, the slotted-plate transverse sectional views 'of'v slotted plates showing different shapes of slots andthe corresponding cutting tools; and Fig. 7 .is a

sectionalV` view of a perforated plate bent into semi-circular shape to show the manner offormingl drainage casings.

The first step inthe process of s lotting vnally of the plateucan pass entirely `through rows .in the manner indicated in Fig. 3, by .'gajngs'of cutting tools 6, which move. over `the sheetin a plane parallell therewith. The

essere@ I ANDREW SMITH, 0E SAN MATEO, CALIFORNIA Patentes muy e, Isis.

slots are cut in successive stages7 which may to cut deeper at successive movements,but

succeeding gang cutting deeper into the 'bedone by adjusting the 'gang .of cutters metalV 'than'the preceding gang a-nfd being coperate` in forming the'desired crosssecof the sheet, the gangs of tools 6 will be ofthe shape as shown in Fig. 6, and merely dierin the depth of cut.

Drainage casings, such `as well curbing,`

culverts,tiling, etc., 'may lbe formed from sheets perforated with slots, as shown in Fig. by .bending the sheets into .tubular or pipe form, the upper side in said figure forming 'the inner side of the casing` and the corrugations 2, j constituting convex bands" encircling the-pipe. lf, however, a

lshown in Fig. 3', is subjected to a pressing 'or rolling, operation to force the corrugain cross section in Fig. 5. If the sheets formed in this manner are bent into tubular form in the `manufacture of drainage casings with the upper side in said illustrations constituting the inside of the casing,

the'vslotswill be' narrowest at the outside,

becoming wider in passing through the wall of 'the casing as shown in Fig. 7. The advantage cf V-shaped slots lies inthe fact ..that any particles which can pass through the slots from the narrow outside opening 'also preferably so shaped. as to'progressively Vtional shape'. `When the slots are to be -V- tions 2 -back into the plane of the' sheet, as

shown in longitudinal section in Fig 4, and

will immediately ass into an evervide'ning channel thereby e iminating any danger of clogging the slots; A

Having fnow 'described the process "of forming slottedv plates o r sheets according to my invention and having pointed out some of the uses of resulting product, I claim 1. The process of making perforated metal sheets or plates for strainers, drainage cassheets or plates for'strainers', drainage cas'- ings, etc.,'con 1prising forming a series of eor'rugations 1nv the metal plate, to raise portions "of, the metal above the plane of the intervening portions, and cutting a series of parallel slots through they` raised portions transversely of the corrugations.

3. The process ofmaking perforated metal sheets, or plates forstrainers, drainage cas.- ings, etc., comprising forming a ser-ies of corrugations in the metal plate, to raise/'portions of the metal above the plane of the intervening portions, said raised portions being flattened substantially throughout their extent, and cutting a series of parallel slots through the raised portions -transverselyr of the .corrugationsvIn testimony whereof-'I ailix my signature in presence of two Witnesses.

lANDREW SMITH.

Witnesses:

E. C.' BROWN, K. HARTIG.

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