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Патент USA US2121303

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June> 2l, 1938.
R, R, RQBERTSON
2,121,303
DOUBLE DOWEL BAR EXPANSION JOINT
Filed Sept. 24, `193'?
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ROBERT R. ROBERTSON
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Patented June 21, 1938
v2,121,303 `
UNITED 1~ ls'rAf?rl-is l PATENT Ilol-‘lálczlai
2,121,303
DOWEL BAR, EXPANSION JOINT
Robert R. Robertson, Chicago, Ill., assigner to
The Translode Joint Company, Chicago
Heights, Ill., a~corporation of ‘Illinois
Application September 24, 1937, Serial N0f165,439
l
(cl. 94-18)
The present invention pertains to road joints
and more particularly to an improved type oi`
tecting housings affording recesses for the recep
tion of the inner ends of do'wel bars which project
road expansion joint adapted to be embedded be-`
in 'slidable overlapping engagement through a _
tween -adjacent concrete road slabs, said joint
5 ,including vin combination a precast _plastic filler
board adapted to be supported upon a road sub
filler board opening and have theouter ends
thereof formed to provide anchors for anchoring
the outer ends of the dowell bars in adjacent road
grade andhaving openings provided therein at
slabs.
spaced intervals for the reception of adjustable
load transmission units, each of which consists
10 of overlapping dowel bars,~the outer ends of
which are formed to be anchored' in the adjacent
in the specification
drawing.
road slabs while the'inner ends- ofthe dowel A j.
15
'
O_ther and further important objects of this
invention will be apparent from 'the disclosures
and the accompanying Í
l
f
»
The invention, in a preferred form, is illustrated
barsproject in opposite directions through an
in the drawing and hereinafter more fully de
opening of the ñller board and into pockets or
scribed.
Íhousings forming part of flanged supporting
plates engaged on opposite sides of the filler board
with the flanged portions of the -plates resting
upon the road sub-grade and staked thereto.
`
On the drawing:
_
ß
Figure 1 is a fragmentary side elevation of an
expansion joint forming mechanism embodying
the principles of this invention and disclosingr the
~ It is an object of this invention to provide a ` apertured ñller board with spaced load transmit
road expansion joint" comprising a preformedl ting units engaged therein and showing one of
plastic ñller board having openings provided at
the openings unfilled.
spaced intervals throughout the length thereof
for the reception of slidably overlapping double
line II-II of Figure 1 showing the expansion*
\
't
‘
Figure 2 is an enlarged sectional View taken on
f dowel bars, carried in supports on opposite sides L' joint forming mechanism embedded in the con
crete road slabs and supported on the road sub-'
road slabs for the transmission of loads from one grade, and furthermore illustrating one-half of
road slab through the joint -to an adjacent road fone of the units in elevation, While the opposite
25 of the filler board and anchored in the adjacent
slab.
30
'
'
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#
It is also an object of this invention to provide 7
a road expansion joint including a preformed
-íillerboard having -openings therein to permit a
plurality of sets of slidably overlapping double
dowel bars to project therethrough, with the outer
' half is in section.
Y
_.
> Figureß is an enlarged vertical detail section
taken on line III-III 0f Figure 2.
Figure _4 is a fragmentary side elevation of a_
portion of a modiiied form of road expansion
joint load transmission unit wherein the dowel
»ends of each set of the dowel bars anchored in bar supports are provided with modified forms of
adjacent road slabs and having the inner ends pockets or housings for the reception of portions
engaged in protecting pockets forming part ofV of the overlapping dowel bars.
- supports for the double dowel bars and disposed
Figure 5 ls a_ fragmentary transverse detail
on opposite sides of the filler board.
section taken on line V-V of Figure J4.
` As shown on the drawing:
'
’
Another~ object of the invention is theprovision
L10 of a road expansion joint in which an apertured ' V 'I'he expansion joint, as illustrated in VFigures 1
ñller board has a plurality of sets of overlapping ,to 3 inclusive is formed by means of joint form
dowel bars projecting therethrough with the outer ing mechanisms adapted to be supported on -a
ends of the dowel -bars anchored in adjacent road sub-grade I for embedding between concrete
road slabs while the inner ends of the dowel vbars ’road slabs 2 and 3.
l
are slidably engaged inpockets provided in the '
The improved expansion joint forming mecha
`,road slabs opposite from the slab in which the lnism comprises a preformed or precast» plastic
outer ends of said dowel bars are anchored. _ . y y ñller board I constructed out of asphalt, sponge 1
It is an important `object of this invention to rubber, cork, or/«any other suitable compressible,
provide an improved "concrete road expansion material, such for example as a compressible'ma
50 joint mechanism including a preformed plastic »a terial known to the trade as “Flexcel". The flller
filler board having openings provided at spaced ' board or core member I _is provided with a plu
rality vof spaced openings 5 for the reception of
intervals therein for the reception of load trans
mission units, each of which consists of a pair of load transmitting means forming a part of a load
spaced angle supports positioned on opposite - transmission unit, one of which is associated with
'
..55 sides of the filler board and provided‘with pro each of the filler board openings 5.
.
'n
2 .
'
2,121,303
Each of the load transmission units comprises
a pair of oppositely positioned metal plates 6
adapted to be' positioned against opposite sides
With the expansion joint forming mechanism
secured in position transversely upon the road
sub-grade, concrete is poured on opposite sides
of the filler board 4 adjacent one of the openings
6. Each of the metal plates 6-has integrally
formed on the lowei` margin thereof an outwardly
projecting base ñange 'I which seats upon the top
of the ñller board to form the concrete slabs
2 and 3 and to embed the housings and the an
choring ends I5 of the dowel bars I4. It will thus
be noted that the double dowel bars of each of
surface of the sub-grade I, as clearly illustrated
in Figure 2. -Each of the metal plates 6 has an
adjacent road slabs and project through an open
the load transmission units are anchored in the
ing 5 of the iiller board 4 in slidable overlapping 10
ilange 8. A socket or housing is secured to the relationship with respect to one another permit
outer side of each of the plates 6 in register with ‘ ting the ends of the dowel bars to project in op
posite directions and slidably engage in the cham
the opening in the plate 6 and with one of the
openings 5 in the ñller board 4. The socket or bers I6 of the sockets or housings forming parts
of the two angle plates 6 which are positioned 15
15 housing comprises a top plate 9, the side margins
of which are deflected to provide side walls I0. on opposite sides of the filler board. With the
One end of the top wall 94 is bent outwardly to expansion and contraction of the road slabs due
provide a mounting flange I I which is spot welded to temperature changes, the overlapping dowel
bars of the load transmission units are slidably
or otherwise rigidly secured to the outer .surface
of a plate 6. The outer end of the top plate 9 moved in opposite directions through the filler
board and the plates 6. The improved expansion
is deiiected to provide an end wall I2 and a pro
joint- also is adapted to transmit loads applied
jecting flange I3.
. >
to one of the road slabs through the joint mecha
Each of the sockets or housings which are at
nisms to the opposite road slab. 'I'he trans
tached to the plate 6 has an open portion oppo
site the plate 9 which is closed by means of a mission of loads isaccomplished by means of the 25
dowel bar I4 to which the socket or housing double dowel bar constructions forming part of
flange I3 is spot welded or otherwise rigidly the spaced load transmission units associate
secured. The dowel bar has slidable contact with with the ñller board 4. Y
Figures 4 and 5 illustrate a modiñed form of the
the plate flange 8 which acts as a guide for the
slidable movement of the dowel bar. The outer load transmission units associated with the aper .30
end of each dowel bar I4 is longitudinally split tured filler board.~ The modified vform of load
10 opening formed therein by striking outwardly a
, with the split portions deflected upwardly and
downwardly to form anchoring ?ngers or blades
I5. >The end portion of each of the dowel barsl
opposite the anchoring blades I5 projects through
transmission unit comprises spaced angle plates I8
having openings therein with the openings of the
opposite plates positioned directly opposite one
another.
Rigidly secured on the outer face of 35
the opening in the plate 6 and through an open Veach of the angle plates I8 is a socket or housing
I8 closed at the top, bottom, and at both sides.
ing 5 of the iiller board 4 and then through the
Upwardly and downwardly projecting flanges 20
opening in the opposite plate 6 and into a cham
ber I6 in the opposite socket or housing. This are integrally formed on one end of the housing
arrangement, as clearly illustrated in Figure 2, I9 and are spot welded or otherwise rigidly se 40
Y positions the inner end portions of the two dowel cured to the outer face of the angle plate I8.
bars I4 in slidable overlapping engagement with Integrally formed on the outer end of each of
respect to one another, so that the two dowel the housings I9 is an end plate 2I which closes
. bars projectl through an opening 5 of the filler only’ half of the fouter end of the housing. In
te'grally formed with the end plate 2| is a flange is
45 >board 4 in opposite directions permitting the ends
of the dowel bars to have slidable engagement in 22 which is spot welded or otherwise rigidly
the sockets or casings provided on the joint secured to a load transmitting dowel bar 23. The
double dowel bars shown in Figure 4 are con
plates' 6 on opposite sides of the filler board.
The improved expansion joint forming mecha
nism, as hereinbefore described, comprises the
apertured ,ñller board 4 which has associated
therewith a plurality of load transmission units,
each of which comprises a pair of oppositely posi
tioned angle plates having sockets or housings
projecting therefrom. Rigidly secured to each
.55
of the housing flanges I3 is a dowel bär which
' serves to-close an opening in the socket or hous
ing.
One end of each of the dowel bars is formed
to be anchored in` a concrete road slab while the
opposite end of the dowel bar slidably projects
through the iiller board .and into a'chamber of
the socket or housing of the opposite angle plate.
The expansion joint forming mechanisms, as f
` illustrated in Figurevlpare adapted to be posi
65 tioned transversely upon a. road sub-grade I with
' the double dowel bars of ‘each of the load trans
7.0
'mission units projecting‘through the opening 5
of the ñller board 4 and with the base flanges 1
of the plate lG'resting upon the sub-grade and
secured in position by means of retaining stakes
I1 which project through openings in the base
flanges 1 andare driven into the sub-grade I -on
diagonally opposite sides of the double dowel bars
and onopposite sides of the filler board, as clearly
75
illustrated in Figure 1. _
structed the same as those illustrated in Figure 2
and have the ends thereof projecting in opposite 50
directions in overlapping engagement with re
spect to one another to span the space between
the angleplates I8 so that the ends of the dowel
bars slidably project into the chambers 24 pro
videdin the housings I9.` _
It will, of course, be understood that numerous
details of construction may be varied through a
wide range without departing from the principles
.of this invention, and it is, therefore, not the
purpose to limit the patent granted hereon other 00'
wise than necessitated by the scope of the ap
pended claims.
I claim as my invention:
-
.
1. In an expansion joint for embedding be
tween adjacent concrete roa'd slabs, a preformed 65
plastic iiller board mounted between the road
slabs and having openings therein, load trans
mission dowel bars arranged in reverse super
imposed slidable contact- with one another and.y
projecting through the openings in said _filler
board, and housing ineans rigidly secured to each
of the dowel bars and embedded in the concrete
on opposite sides of the filler board for slidably
receiving an end of the other dowel bar.
2. An expansion joint forming mechanism in 76
3
2,121,808
cluding in combination, a preformed compressible
filler board having openings therein at spaced in
tervals, a plurality of pairs of load -transmission
cluding in combination a load transmission unit "
the filler board, each pair of said dowel bars being
arranged in reverse superimposed slidable contact
with one another, apertured angle plates posi-
housings and projecting through the respective
comprising a pair of spaced apertured angle
plates, a housing secured on each of said angle
dowel bars ,projecting through the openings in ~ plates and a dowel bar secured to 'each of said
angle plate on which the housing to which it is
secured is engaged, said dowel bars being re
tioned on opposite sides of the ñller board, means versed with respect to one another and slidably
for securing the apertured angle plates in posi- ‘ contacting one another to bridge the space be
tion, and housings secured to the outer sides of tween said angle plates.
said angle plates with one of said housings se
6. An expansion joint forming mechanism in
cured to each of said dowel bars and slidably re
cluding in combination a load transmitting unit
ceiving one end of another dowel bar.
comprising a pair of reversed apertured angle
3. A road expansion joint comprising a pre
plates, a housing secured to each of said angle
15 formed ñller board having spaced openings there
plates, a ñange on each of said housings, and a
in, apertured metal plates on` opposite sides of the
filler board adjacent the openings, apertured base
flanges on said plates for supporting the plates
in position upon a road sub-grade, housings se
20 cured to said plates over the openings therein,
load transmission dowel bar projecting through
each plate and housing and rigidly secured to the
respective housingñange, said dowel bars project,
ing in opposite directions in slidable contact with
and superimposed contacting loadv transmission
dowel bars projecting through said plates and
through the filler board, each of said dowel bars
secured to one of said housings and slidably pro
25
jecting into an adjacent housing. .
, `
4. An expansion joint forming mechanism in
cluding in combination a load transmission unit
comprising a pair of spaced plates, a housing rig
idly< secured on the outer face of each of said
30 plates, a dowel bar secured to each of said hous
ings and having the inner en_d thereof projecting
through the space .between saidrplates and into
35
an opposite housing in slidable contact with the
adjacent dowel bar, and anchoring means formed
on the outer ends of said dowel bars.
.
l
5.*An expansion joint forming mechanism in
one another to span the space between the angle
plates.
'
7. In an expansion joint for embedding be
tween adjacent concrete road slabs, a preformed
plastic filler board mounted between the road
slabs and having openings therein, housing mem 25
bers on opposite sides of the filler board adjacent
the openings therein and embedded in said road
slabs, and pairs of reverse superimposed load
transmission dowel bars embedded in the concrete
slabs and projecting through the openings in the 30
filler board, each of said dowel bars being se
cured to one of the housings and slidably pro
jecting through the filler board into a housing on
the opposite side of the joint.
i
ROBERT R. ROBERTSON.
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