Oct. 8, 1946. IR. AMÁGRATH. sR., Erm. DOWEL BAR 'PROTECTOR ` Filed April 11, 1945 ' 2,408,939> » Patented Oct. 8, 1946 2,408,989 UNITED PATEN’IÍ" GF'FICE" Robert A.~MeGrath,-«sr., andvEilén E. "MeG?athQ » Brooklyn, N.- Y.l Añplication'f'April 11,4 1945, SerialNo.y "5872726"î 2 Claims. (Cl. 25-118) 2, This .invention relates `'toidowel ¿bar-protectors" ofthe"roadways, general'type used ‘inlîeonstrluctionïof coni crete crete = road construction which'A is adapted ztoiibe f associated 'with' the’f projecting:v bent' portions fof»A struc‘ted ' and _ arranged~` l For tying Ytogether-the 'two sec tions of the completed-roaciîway,4 dowè1~-bars`1are frequently> embedded -in the first laid-ï section „ ing» engagement with 'the concrete :after -the 'flat-î te'rì'ï‘has set. Y By virtue' of this> construction» then: protector` becomesfn'inly embedded in‘the?’com' crete andi does not“ require «removal therefrom.' Another 'object a protector ofdth'e -aloove'fcharacter whichziin-'ì cludes- laterally concretewings@ inl tight' adapted contact fitowith` "be 1 held-by the plasticdisposed the Vinner face of the ` sideirail íso- fas not ’,to: ree' quire'! supplementa'ry.` means; such' ra'si‘ clipsëî orf bars" at right ang-lesesol astol extend parallel and stakes“ for retaining thev protector" inîi rpositioni A closeV to" the retaining -raillïwhio‘hï ‘confines îthe ~ preparatory _to pourin'gwthe 'concrete-:f concrete along the innerlside'ïof Athe ñ‘r's't-.com Still another object of» our invention is vto» pro: pleted road` section.r Then, when! ¿the concrete 20 vide a- flat blank #of sheet 'materiaL for‘îexample »A from whichV our protectorî can bel-'ffa’she ioned on `the l»job' with the simplest Ltoolslïandiby-f‘ relatively unskilled Aworkmen` Thus», a suppl-yf‘offî protectors ‘Cani b'elshipped and stowediïinllth'eA way;> Unless` the~*bent portions ofi the dowel«bars 25 as~ to occupy 'a ` minimum i which lie adjacent Ytheï-retainingfrailare suitably l amount`~ of` space,i andi eifectingila .reduction'îi in- 1 transportationcosts, »and the blanks can ibeeloen'tlï to shape at the time and» in the quantityîthatïtheyf are »required for use.-` _ Other objects and advantages ïwíllbe appar# ent 'from' the Vfollowing ~ detailed- descrip’tion‘ï off al; proposed?y to# asso' preferred- embodiment of the invention; reference 'r ciate protectors with the Ibent portions 4'of the dowel bars to prevent them from becoming cov being had to the annexed! drawing ¿in which : ~ ered with concrete. One-such» yform of protector dowel bars; is rdisclosed-in»Patent-No;~1,987,392 of Charles Figure l isa perspective 'view of ‘afproteetor f'orff ` Figure-2 l'is asideviewfofftheprotector; Figure -3 is a ~ cross-section of 'the ïf protector f taken on the line 3_3 of Fig. 2; Figure 4 is a cross-section through a portion Figure 5 is a plan view of a blank from which the protector is formed. Referring to the drawing, in Figs. l and 2 is 4shown a dowel bar protector P. The protector comprises an elongated strip of metal folded along a line extending medially throughout its 50 wise injuring the edge of the roadway. extending laterally outwardly from its two lower It is an important object of our invention to provide a protector for dowel bars used in con edges are wings 2a and 3a, respectively, both 55 lying in a common plane. l The ends of the casing are pressed together 2,408,989 and held by tie wires e passing through registering holes 5. These ends project longitudinally beyond the corresponding ends of the wings 2a and 3a and are undercut, as indicated at 6, so as to overhang the plane defined by the wings. An 5 way above Ithe other to an extent suilicient to break or loosen the dowel bars, the smooth faces of the wings 2a and 3a allow relative slippage between the vertical faces or the road sections and reduces to a large extent the danger of opening 1 is provided in the ridge of the casing adjacent but spaced from one end but located at such a distance therefrom, measured lengthwise cracking of the cement. The blank B shown in Fig. 5 from which the protector is made is composed of relatively light of the protector, as to lie rearwardly of the tergage sheet metal, this metal being of ‘suillcient mination of the undercut 6. ` lu rigidity to withstand the .pressure of the concrete In laying a section of roadway a concrete rewithout deforming but being readily bendable by taining rail R (Fig. 4) is secured in place so as hand or by means of a pair of hand pliers. The rto extend longitudinally along the middle of the _ blank is grooved or otherwise weakened along the road under construction, it being understood that bend line a forming the ridge of the casing l and a similar rail (not shown) is secured to the outer l5 also along »the two bend lines b where the wings edge of the road. An initial layer of concrete C ' 2a and 3a join the sides of .the casing, forming 0f (approximately one-half the iinal proposed thick- the protector to proper shape without calling for ness of the roadbed) is poured between the rails, any special skill on the part of the workman. after which dowel bars B are laid horizontally Instead of being made of sheet metal as de upon this bed, usually over a wire reenforcing 20 scribed above, the casing may be made of any netting N, with the ends of the dowel bars bent other suitable sheet material, such as paper, plas so as to extend closely adjacent and parallel to tic or wood. Also, instead of the Wires 4, other the rail R. means-_such as pins, screws, bolts, or rivets A protector is associated with each dowel bar may be used to hold the ends of the easing to by introducing >the bent' end of the bar through 25 gether. Manifestly various other changes in con the opening 1 so that the bar lies within the apex struction and design within the skill oi the art of the triangular casing, as shown in Fig. 4. One may be made in the protector described above wing of the protector is pushed down into the soft without departing from .the spirit of our inven concrete and in contact with the rail R so as to tion as defined by the following claims. retain the protector in place while the other 30 We wing, also flatly abutting the rail, extends above 1. Aclaim: protector for dowel bars comprising an the level of the concrete. Following this, another layer of concrete C' is deposited between the rails on top of the ñrst layer C completely em- elongated casing made of sheet material adapted to receive a dowel bar, `the ends of said casing being closed,0f wings extending from the lower ends both Sides 0f thelaterally Casing but 0f leSS bedding the oí dowel bars andtoprotectors rais ing the level the roadway the top ofand the rails. During the pouring of this final layer, `the plastic length than the casing, said easing being under cut adjacent its ends, and a relatively small open concrete ilows into the space between the undering in the top of the casing in the vicinity of one cut 6 and the inner face of the rail, thus locking of its ends through which the dowel bar may be the protector in the concrete. Since «the ends of 4o slid endwise into the casing. the casing l are secured .together by the tie wires 2. A protector for dowel bars comprising an 4 and because the wings 2a and 3a are pressedr elongated casing made of sheet material and of tightly into contact with the face of the rail generally triangular shape in transverse cross by the pressure of the concrete, the bent porsection, means .closing the ends of said casing, tions of the dowel bars are effectively shielded 45 wings contiguous with and extending laterally from the concrete, such little vconcrete as may from the lower` ends of both sides of the casing, ilow into the casing through the open bottom of said wings terminating a spaced distance from the undercut E being negligible. the ends of the casing, a relatively small opening After the concrete bed has set, the rail R is in the top of the casing in the vicinity of one of removed and the bent dowel bars B are straíght- 5U its ends through which the dowel bar may be slid ened so as to extend over onto the other halfendwise into the casing, said casing being under section of the roadway and are embedded in the cut from its ends to a point adjacent the wings, concrete composing that section when the roadand said opening being located beyond the un way is completed. The protector remains in the dercut area. concrete when the roadway is iinished. Thus, in 55 the event frost, earth ¿disturbances or other action causes the raising of one lane of the road- a Y v ROBERT A. MCGRATH, Sn. ELLEN E. MCGRATH.