US1790973A - Weatherstrip - Google Patents

Description

Patented Feb. 3, 1931 V METAL WEATHER STRIP COM'PANY, OF

ST. ouis, misses-m I WEATHER tate."

Application filed April 26,

My invention relates to metal weather 1 strips and more particularly to spring strips having angularly disposed and hemmed edges. 1- p These strips are usually'made of spr ng bronze and provided with a nailing edge, for

, make contact uniformly door edge. 1

attachment tothe door frame,"and a free or spring edge, for pressure against the edge or the door when it 1s closed, these edges being angularly and oppositelydisposed relativeto the body'of the strip. The contact between the strip and the door'edge prevents drafts and air currents from entering the building provided there is a. substantially uniform pressure or tension exerted by the strip along the entire door edge. r

In practice it has been difficulttoobtain uniform contact onaccount of 'the irregularity of the door edge and the tendency of the strip to buckle and bulge and lose its flexibility when it is nailed in place with its free edge spaced from the door frame. Furthermore, the flat spring material which is used for these strips is very suscept1ble to lnternal strains and stresses which produce bulges,

and, when both edges of the material are hemmed in the process of fabricating the strip, the bulges and buckles becomefso numerous that it is practically impossible to obtain a strip which will accommodate itself to the contour of the door edge.

l The object of my invention is to provide a double hemmed, angle-edged, spring, metal weather strip having means for controlling and equally distributing the internal strains which are produced in hemming 1ts-edges so that the strip will be flexible, true and regular throughout its length when put to use.

Another object of my invention is to provide a spring metal weather strip having hemmed edges disposed at an angle to the body of the strip and which, when fastened in position, will have a free edge adaptedto along the entlre A further object of my invention is to provide a hemmed spring metal weather strip adapted to be formed in a coil and which when unwound from the coil will present 192a sriar' o. 04,652.

and free from bulges or buckles.

A still further object of my invention is to surfacewhich spring metal weather strip in "which the strains produced in hemming and coiling are distributed along predetermined paths or lines throughout the length ofthe strip: My invention consists in the novel construce tion, combination and arrangement of parts as hereinafter fully, "clearly and concisely described, definitely pointed outin my claim can, I

EUGENE r. coox, or RICHMOND nnrenrs, lvri'ssouiirfnss eNon'rro oursn. Koran-Q.

. providea hemmed, angle-edged, coi-lable and illustrated by the accom panying draw- 7 ing, in which r The figure is'a' perspective view of'a coil of my weatherstripping; I

' Referring to the'draw ing, 1 is the nailing edge of my strip, and 2isthe, free or spring edge, the nailing edge preferably being some- I c what greater in width than the free edge for facilityin attaching th'e'strip toa door frame eachoftheseedgesis turned on itselfto' provide a roll or-hem, 3, in order to stifien the edge and prevent itsvibration by air currents. T As shown in the drawing, these edges are then bent atan angle to the bodylof the strip, the angle being. such that 'when the edge 1 is attached to a door frame, the body I of thefstri'p will be inclined relative to -the face of the doorframe and edge 2 willbe spacedtherefrom.* Intermediatethese edges isthef body of 'the'strip which comprises a series of inclined surfaces 4, forming ridges 5, and grooves 6, having a longitudinal trend throughout the length of the strip. By pref-. erence, these ridges'and grooves are parallel and equally spaced and the inclinedsurfaces areof equal width and like trend.

' 1t is obvious that the .body of the strip,

in practice, isnot of uniform cross-section and that in forming the hem, 8, strainsv will occur whichresult in bulges in the body, and that an alteration of these strains will occur and further bulges be produced when the edges 1 and 2 are bent at opposite angles rela tive to the body. It is likewise obvious that some of these bulges will be upward and I others'downward and that if they are notre strained and limited in their formation,the fastening of the edge 1 to the doorframe will so distort theedge 2 and the body of the strip that no uniform contact can be had or maintained between the strip and the door edge.

I have found-that these bulges "can be ab sorbed or controlled :by forming the ridges I '7 l 5 and grooves 6 in the body and that by this means the bulges are distributed along definite regularlines and their character is changed. fromirregular depressions and distortions, at sporadic intervals, into, axserie's of predetermined upwardly and downwardly inclined surfaces which are not only harmless to the stripbut give it smoothness, pliability and flexibility for coiling and nailing, resistanceagainst "buckling and fatendejncy to lay fiat when uncoi led. 7

A metal Weatherstrip adapted to be coiled into roll form and consisting of a single piece of material inoludinga nailingedge of double thickness, the'thickne'sses thereof being compressed into, adja'cence to form a stiffening portion;a central or body portion of the strip having a trend at; a distinct angle to the nailing edge, said central portion con-V s stmg, on each face, ofalternate ridges and furrows, thefurrowed portions being of relatively flattened, V shape and ofdistinctly angulate conformity, the ridges on one face of the strip being coincident with the furrowed portions of'the opposite face of the strip and the ridged and furrowed portions being of substantially uniform width and spacing across the strip; the opposite edge of the strip terminating in a portion of double thickness, the thicknesses lying in close ad-, jacenc e and constituting a free or pressure edge, disposedfat an angleto the trend of the central or body portion, and of slightly less width than that of the nailing edge of the strip, said' edges each being joined to the central body portion at an angle corresponding substantially with that formed between adjacent furrows and ridges of the body portion, whereby the strip presents a substantially regular, transverse zig-zag or sawtooth section, characterized by the absence of grooves or corrugations of rounded contour. a

EUGENE F. COOK I

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