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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.
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