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Патент USA US2107827

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Feb. 8, 1938.
J. w. KERR
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2,107,827
DIVIDING AND REINFORCING MEANS FOR‘ CONCRETE ROADWAYS
Filed July 17, 1934
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Patented Feb. 8, 1938
2,107,827
ul"§>.'v.i<umnzb STATES PATENT OFFICE
DIVIDING AND‘ REINFORCING MEANS FOR.
CONCRETE ROADWAYS
.
‘John .Willard Kerr, Chicago, 111., assignor to
Ernest H. Geyer, Chicago, 111.
Application July 17, 1934, Serial No. 735,671
3 Claims.
My invention relates to dividing and reinforc
ing means for concrete roadways and has for its
object to provide a simple and inexpensive joint
strip and dowel rod which will serve the purpose
5 of holding the slabs of opposite sides of the mid
dle of the roadway ?rmly against relative verti
cal movement, and will at the same time permit
such hinging along the mid-line as may be caused
by unavoidable stress. A further object of my in
vention is to provide a joint strip of simple con
struction that will hold the dowel rod horizontal.
A further object of my invention is to provide
improved means for connecting successive sec
tions of joint'strip.
15
With the objects above enumerated and other
objects hereinafter explained in view, my inven
tion consists in the construction and combination
of elements hereinafter described and claimed.
Referring to the drawing:
20
Figure 1 is a plan view of a roadway showing
my dividing and reinforcing or joint strip in
position.
'
Figure 2 is a side view of the joint strip.
Figure 3 is a vertical sectional view on line
25 3-3 of Figure 2.
Figure 4 is a view similar to Figure 3 but show
ing a cap strip for the upper edge of the joint
strip.
30
Figure 4a is a fragmentary top plan view of
the cap strip.
Figure 5 is a side view showing my connecting
strip in position.
Figure 6 is a vertical sectional view on line 6-—6
of Figure 5.
35
Figure 7 is a plan view of the clip.
Figure 8 shows the dowel rod bent into double
S-shape.
In the drawing, l indicates the central por
tion of an underlying roadbed ready to receive a
40 concrete roadway. 2, 2, indicate roadforms usu
ally arranged longitudinally of the roadway at
its side edges.
3 indicates a longitudinally ex
tending joint strip preferably are shaped in cross
section arranged midway between and parallel
45 with road forms 2, 2, to separate the concrete of
the roadway into a right hand and a left hand
strip or slab to lessen the effect of expansion and
contraction of the concrete, the joint strip con
sisting of a strip of sheet metal of a width cor
50 responding to the depth of the concrete at the
middle of the roadway, preferably slightly less
in width than the depth of the concrete.
4 indicates a dowel rod carried by the joint
strip in a plane between its upper and lower
55 edges and extending laterally in both directions
(Cl. 94-17)
into the masses of concrete with the purpose of
so holding them as to permit slight movement
under the in?uence of heat or cold without per
manent relative displacement. This dowel rod
4 consists of a metal rod of any desired diameter, -.
usually a quarter or three-eighths of an inch,
bent into zig-zag form so as to present on each
side of a median line a succession of angles or
hooks 41, 42, 43, 44, 45, 46. In Figure 1 the angles
or hooks 42, 44, and 46, are shown as extending
through joint strip 3. The joint strip is pro
vided between its upper and lower edges with a
series of longitudinal apertures 5 each of a length
corresponding to the distance, on the median line
of the zig-zag, between the two legs or angles or 15
hooks 42, 44, and 46, so that the angles or hooks
on one side of the joint strip will extend into
the concrete the same distance as do the angles
or hooks on the other side. The dowel rod may
be bent into various forms, as for instance, the
double 8 shape shown in Figure 8.
The edges of longitudinal apertures 5 are pref
erably turned outward, so as to form parallel
lips 51 and 52 on the inside of the are which serve
to hold the dowel rod in horizontal position. 25
These lips may be pressed toward each other to
clamp the dowel rod between them.
If desired the joint strip may be provided with
additional apertures 6 to receive additional dowel
rods and the apertures may be on any line be- 30
tween the upper and lower edges of the joint
strip.
Before completing the ?lling in of the con
crete against the sides of the joint strip it is de
sirable to place on its upper edge the cap strip
l2 shown in Figure 4.
This consists of a hori
M5
zontal top portion II from the opposite edges of
which depend ?anges I2 and I3, the lower edges
of which are bent outward to, form horizontal
?anges I 4 and I 5. In these ?anges are found 40
openings [6 large enough to permit concrete to
?ow through them.
In order that the joint strip may be continu
ous, separate strips 3 must be held together at
the meeting ends. For this purpose the strips
are provided near their ends with vertical aper
tures l and the strips are held together by
tongues 8, 8, extending through these apertures
‘I from a clip plate 9, the upper edge portion In
of which is bent over the contiguous upper edges
50
of the two strips 3.
Having thus described my invention, what I
claim is:
1. A dividing and reinforcing strip for con
crete roadways comprising a ?at metal strip hav
55
»2
2,107,827’
ing straight upper and lower edges and having
between its edges a row of longitudinally extend
ing apertures and an anchoring member of such
zig-zag form as to present angularly projecting
members extending laterally in opposite direc
tions from a median line, the apertures in said
metal strip being each of such length as to per
mit an angular projection of the anchoring mem
ber to be passed through it.
I
2. A dividing and reinforcing strip for con
10
crete roadways comprising a flat metal strip hav
ing straight upper and lower edges and having
between its edges a row of longitudinally extend
ing apertures and an anchoring member of such
15 zig-zag form as to present angularly projecting
members extending laterally in opposite direc
tions from a median line, the apertures in said
metal strip being each of such length as to per
mit an angular projection of the anchoring mem
her to be passed through it, and each having its
longitudinal edges outturned to form a guide and
support for the anchor member.
-
3. A dividing and reinforcing strip for con
crete roadways comprising a flat metal strip hav
ing straight upper and lower edges and having
between its edges a row of longitudinally extend
ing apertures and an anchoring member of such
zig-zag form as to presentv angularly projecting
members extending laterally in opposite direc 10
tions from a median line, the apertures in said
metal strip being each of such length as to per
mit an angular projection of the anchoring mem
ber to be passed through it, and each having its
longitudinal edges outturned to form a guide and
support for the anchor member, and caused to
clamp the anchor member.
JGHN WILLARD KERR.
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