US 2483888 A
Description (OCR text may contain errors)
Oct.d 4, 1949. G. R. DANlELsoN 2,483,888
EDGE FINISHING STRIP FOR PLASTER WALLS Filed Aug. s, 1944 Patented Oct. 4, 1949 Gdeonlt; Danielson, Geneva,-
Y Appuceuoneugusf 3, 1944, serial Nutmss (Cl, '12e-0.51)
MS* invention4 relatesv to` an improved edge finishingstrip` for plaster walls; and more particularly' to one providedY with a plasterlock arranged in a. marmer so aste prevent checking or the development 01 hairline cracks at the exposed cornerformed by' an edge of a plaster wall surface:
TheY object' of the edgenislling strip herein shownis to provide ait' points, where it is necessary tor terminate a plaster' wall surface; an edge surface of ar protective material, such as metal or plastic. For instance, where' tlie edge surface of a plaster wall wouldv be expcsedj to impact which wouldy tend to chip ofithe exposed corner or crackr the plaster edge surface til-ieVA use or am edgel rrsliing strip would serve to prevent: andwould also be of decorative value:
In other instances where a plastered wall surface would ordinariiy directly abutk an object, such as a built-in bathstub, under circumstances which would permit a crack to open up* such joint, Fha-ve found it advisable toterminate the wall surface sl-io'rt of the' object by' an edge 'nis'hing stripe so that the1 joint will be lie-tween` the protective material of the finishing stri'pand the object; instead? of between the plaster' itself and the object.. Tlii-s is: or especial advantage. in situations where.Y plaster joiiitwould' be exposed to moistute thev` reason that water. working into atplaster joint will tendto disintegratetlaet plaster from beneath. the: surface;y thereby eventually causing the. chipping off ofthe4 plaster atA the joint; resultingirn arr eizilarged'r irregular and unsightllycraclt.
Myinvention overcomes this` diiilcu'lty in two respects: First, by providingv a, moisture imperclous edge the water cannot get up into the plaster from. the joint; and secondly,l by proriding a plaster lock which extends inwardly trom the corner not only is the corner protected from accidental blows. or impact, but the plas-ter is aise reinforced so as to prevent the development of cracks. extending inwardly from: the wally sur; face.
A further obiect of' my invention is; to provide a. finishing strip which is of decorative value: and which cari serve as a; plaster:l ground in the securng of a. subst'ani-:iallyr plane wall:- surface adjacent the -nishect edge.
Another obiects toprovide an, improvcdmeens 2 for protecting the plaster wall at points where it abuts ari object' such as a built-in bath-tub;
Stil-l another objiect; is to provide an` improved joint between the plaster wal-ll and the bath-tub which isi substantially resistant to the disintegrate ing action of-'the Water;
A stili further' oliject is to provide a -n-islii-ng stripisu'itable for use at the joints betweenI plaster Walls and plumbing fixtures which embodies Hreai'rsfY whichY tendto preventr theb entry of water interv the crack' between the finishingstrip'Y and the plumbing fixture.
Still another object is.V to pro-vide improved means' for finishing ofi the edge of a plaster: wall sua-face a manner which willfprotect and rei-nforce the, plaster wall surface the vicinity` of the exposedcorner.
@ther otrie'ctsl,v features and advantages of my invention willL become apparent as this` description proceeds. A
Witt reference now to the dra/Wingsihwhich like referencel numerals designate like parts,
' Fig. I is ai perspectveview of a prefer-red embadi-ment myinvention;
l'fg. Z isalseotionv through the-joint-between the plastered wall surface and a; bath-tub-whi'ch illustrates: one applicationof the finishing strip shown irs-Fig. I;
Fig: :iis asecti'on` similar to Fig-1 2,I butshowing a;- modiedi form ot finish-ing strip;-
Fig. 4 is a. perspective View of tliemodied form oflnisliingfstrip shown irrlii'g. 3;
Fig. 5 is afvi'ewsimi-lfa'fr to Fg; 2' but showing a: still? further modified fori-n1 of the nishing strip.;
Figsv 6V arid'f'? are sections showing other applications of the iinisliing'stripslnown-v inFig. I; and
Fig... 8 is atsection showing. a modi'fedform of imzenti'on.V refferenfcenowtoFigs. l and 2, the reference numeral Hl' designates generally a riishing strip which. preferably is formed from a strip of metai and folded alonglines ll" and lf2 into the form shown.. folded the finishing strip comprises: a. verticalE portion i3, a, horizontally extelidingrportion adjacent thereto, and referred to hereinafter as the edge t4, and a rearwardly and opwavdty bent. portion which is hereinafter reterreur toas the plasterlfock l5. The plaster lock is formed with a series of apertures I6 therein A. tlzmough the plaster of a walt surface may be forced in order to reinforce the plaster in the vicinity of the corner formed by the edge of the wall. These apertures are shown as being of triangular shape, with the bases of the triangles closely adjacent the fold line I2.
The manner of application of the finishing strip I to a wall is shown in Fig. 2 in which the reference numeral I8 designates generally a wall. The wall may be of the usual construction, including studding I9, lath nailed thereto, and one or more coatings of plaster applied thereto, the plaster being designated by the reference numeral 2 I'.
Between the studding there is secured a backing strip 22 to which the finishing strip I0 is nailed by nails 23. The finishing strip is originally provided with nail holes I1 for this purpose, as shown in Fig. 1.
1t will be noted from Fig. 2 that the crushing strip is nailed in place prior to the application of the lowermost lath, the gap between the end of of my invention which is particularly adapted for use in providing a watertight joint with a baththe plaster lock I5 and the verticalportion I3 l being wide enough to receive the lath.
As the wall is plastered, the plaster is forced through the apertures I6 in the plaster lock I5 so that the plaster is reinforced in the vicinity of the fold line I 2, otherwise referred to herein as the exposed corner. Due to the fact that the edge I4 is substantially perpendicular to the direction of the pressure of the masons trowel, the finishing strip can also be used as a ground or a bearing point for the trowel in order to secure a substantially plane surface in the vicinity of the finishing strip.
the plaster lock abuts the lath 29 which serves further to increase the resistance of the finishing strip to the pressure of the trowel.
Although the finishing stripA when installed as pointed out above can be used to finish off any edge of a plastered wall surface, such for instance as the edge formed around doors and windows, Fig. 2 shows the manner in which the wall may be finished off at the point where the plaster would ordinarily abut a built-in bath-tub 24.
The built-in bath-tub 24 is shown as being provided with a flange which in accordance with the usual practice has a slight downward slope and a small upwardly projecting boss 2E at its edge. It has been found that within the first year or so after the installation of a built-in bath-tub, there will be a certain amount of settling of the timbers on which the bath-tub is supported. Thus any plaster joint will crack open. Whereas the use of a finishing strip at the joint will not avoid the settling or dispense with the crack, it does provide a crack which is nished looking and has smooth edges, and is not subject to disintegration by moisture. This is preferable to the irregular and constantly enlarging crack which obtains where the finishing strip is not used.
The crack between the finishing strip and the bath tub may be plugged, if desired, with a strip of rubber of circular cross-section of a diameter greater than the width of the crack. This rubber sealing strip 21 when forced into the crack is sufficiently compressed so that a considerable amount of settling can subsequently take place without causing the strip 21 to become loosened.
The plaster wall surface may be provided with a coating of waterproof enamel or paint, with the result that a waterproof and non-cracking joint is provided which will permit of certain amount of settling.
In Figs. 3 and 4 I have shown a modified form It will also be noted that the inner portion of tub. In this modification the finishing strip 30 comprises a vertical portion 3| and edge 32 and a plaster look 33, the'latter being provided with circular apertures 34. The lower part of the vertical portion 3I is bent forwardly at a slight angle, as indicated by the reference numeral 35, so that the fold line 36 is spaced from the backing strip 22. The finishing strip 30 is formed from a much wider strip of metal than the finishing strip I0, and the excess metal is accommodated by providing a folded over portion 31 which extends downwardly from a fold line 38, and which at its lower portion is curved as indicated at 39. The folded over portion 31 terminates in a forwardly projecting portion which is referred to herein as a sealing strip 48.
Reference to Fig. 3 shows that the space behind the bent portion accommodates the curved portion 39, and the resilience of the folded over portion 31 causes thesealing strip 40 to be urged against the flange 25 of the bath tub 24.
. The finishing strip 30 is provided with nail holes 4 I, and is mounted on the wall in a manner similar to finishing strip I0; that is, it is nailed to the backing 22' by means of nails 23. This is preferably accomplished after the bath tub has been set in place, this finishing strip 3i) being pushed downwardly against the resilience of the folded over portion 31 so that it contacts the fold line 35 which acts as a bearing point to insure a good pressure between the sealing strip and the flange 25'. After the bath-tub 24' settles, the resilience of the folded over portion 31 will cause the sealing strip 40 to remain in contact with the flange 25 so as to prevent the entry of water between the two.
The finishing strip 30 is preferably made of a strip of comparatively thin gauge corrosion resisting metal having good spring properties such as a nickel chromium steel alloy.
A still further modification is shown in Fig. 5 in which the finishing strip 42 is a composite strip made up of two members 43 and 44.v The member 43l includes the vertical portion 41 and the edge 48, and the member 44 includes the plaster lock 45 and a depending portion 45 which partially closes the gap between the edge 48 and the bathtub flange 25". i
The two members 43 and 44 may preferably be welded together as indicated at 49. One advantage of this construction is that although both of the members 43 and 44 are made of f' suitable non-rusting metal, the member 43 may be of a less costly metal, and the member 44 may be provided with an ornamental plating which serves as a border around the bathtub. Although a crack will open up between the depending portion 46 and the bathtub flange 25 as the latter settles, it will be seen that the depending portion will still serve as a partial barrier to the entry of water in any great amounts into the space between the edge 48 and the flange 25". If 'any water does enter into this space, it will be drained back into the bathtub. This space is suiiiciently large so that there will be no capillary effect which tends to retain the water. Furthermore, water splashed on the plaster wall surface 2!" as it runs down to the bathtub, will not work into the crack due to the presence of the depending portion 46 which carries the water well below the lower surface of the edge 48.
Although my invention has been shown as 76 being applied to a plaster wall embodying wooden laths, it will be understood that the invention may be applied to a wall embodying metal laths as Well.
I have found it preferable to employ a plaster lock such as that shown in Fig. 1; namely, one wherein the apertures are triangularly shaped with their bases parallel to the line of intersection of the diagonally disposed portion I 5 and the edge portion I4. For instance, this spacing can be one-eighth of an inch orless for best results.
Fig. 6 is a horizontal section, the central portion being broken, through a wall 59 at a doorway or other opening, and illustrates another application of the finishing strip shown in Fig. 1. In this instance, two finishing strips 5l and 52 are nailed to the studding 53 or other support which forms one edge of a doorway. The plaster is designated by the reference numerals 54 and 55, and is applied to laths 56 and 51 nailed to the studding 53.
Fig. 7 is a vertical section through a wall showing a still further application of the finishingV strip of Fig. 1 in connection with a baseboard 58. A finishing strip 59 is mounted just above' the baseboard 58 and is nailed to a backing strip 60. The advantages of this construction are that the plaster 6i is flush with the baseboard, and due to the non-overlapping construction, a considerable amount of plaster is saved.
Fig. 8 is a horizontal section through a wall at a point Where a door or window casing Sla is inserted in the wall. The casing 6I includes a frame member 62 which is shown as being set beneath the surface of the plaster 63. The finishing strip 64 is a modification of that shown in Fig. 1 in that it is provided with an oifset portion 65, forming a recess in which the frame member 62 may be received. In both Figs. 6 and 8, the exposed corners of the plaster are protected by a finishing strip which embodies a plaster lock.
Although I have shown only preferred embodiments of my invention, it will be understood that various changes and modifications may be made therein without departing from the spirit thereof. The foregoing description and the drawings are illustrative only, and my invention is to be limited only by the appended claims.
1. An article of manufacture comprising a resilient metal strip folded longitudinally into four continuous longitudinal portions which are connected to each other by folds along their side edges, each of said first and second portions being substantially planar, the second and third portions being disposed substantially perpendicular to each other, the first portion being disposed at an acute angle to said second portion and extending toward said third portion, and being of a width less than the width of said second portion, and said fourth portion being folded back over said third portion, and in contact therewith, and being of a Width greater than the width of said third portion, said fourth portion being bent forwardly said fourth portion, thereby permitting said marginal portion to bear against a surface spaced from and disposed substantially parallel to said second portion to form a seal. Y
2. An article of manufacture as set forth in claim 1, wherein the lower part of said third portion is bent forwardly to permit said fourth portion to assume a radius of curvature sufllciently great so that it will not be iiexed beyond its elastic limit when it is flexed so that said marginal part is closely spaced from the surface of said second portion.
3. A sealing strip for sealing the joint between a plaster wall structure and a bathtub ange comprising a single strip of resilient metal folded longitudinally to provide three parallel folds, said strip having rst, second, third and fourth continuous longitudinal portions connected to each other by said folds, said second portion being substantially planar, said third portion extending from the fold along one side of said second portion and being disposed substantially perpendicular to said second portion, said iirst portion extending from the fold on the opposite side of said second portion and extending backwardly toward said third portion, the marginal edge of said first portion being spaced from said third portion, and said fourth portion extending from the fold of said third portion in a downward direction and being bent forwardly underneath said second portion, the bent part of said fourth portion being bent in a comparatively large radius and being adapted to resiliently bear against said bathtub flange to form a seal.
GIDEoN R. DANIELsoN.
REFERENCES CITED The following references are of record in the le of this patent:
UNITED STATES PATENTS Number Name Date 1,029,106 Collins June 11, 1912 1,624,121 'I'hiem Apr. 12, 1927 1,674,344 Richards June19, 1928 1,694,673 Thomas Dec. 11, 1928 1,723,991 Baum Aug. 13, 1929 1,765,712 Baum June 24, 1930 1,924,971 Baum Aug. 29, 1933 1,939,115 Fritsche Dec. 12, 1933 2,045,482 Maier June 23, 1936 2,143,034 Sakier Jan. 10, 1939 2,178,501 Stancampiano et al. Oct. 31, 1939 2,357,688 Robinson Sept. 5, 1944 FOREIGN PATENTS Number Country Date 41,526 Norway 1925