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Патент USA US2114328

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April 19’ 1938.
Filed July 19, 1937
Patented Apr. 19, 1938
I 2,114,328
James Fred Barton, Edwardsville, Ill.
Application July 19, 1937, Serial No. 154,366
6 Claims.
This invention relates to certain new and use
ful improvements in concrete key strip supports,
the peculiarities of which will be hereinafter fully
described and claimed.
In concrete road making, a slab is laid on one
half the width of the roadway and a “V-strip” is
supported against the form forming the center
of the road so as to leave a longitudinal groove
(Cl. 25-118)
My support for the key strip consists of a ?at
metal bar in the form of a strap, one end 4 of ‘
which is laid into the ‘face of the key strip so as
to be ?ush therewith, and then is bent over the
top down the back side, forward under the strip, GI
then down in the same vertical plane‘ as the end
4 forming a vertical leg 5 about half the slab
thickness, or long enough to allow an outwardly
projecting foot 6 to be driven at right angles
under the form as indicated in Figs. 1, 2, and 3. 10
in the edge of the slab to provide a key for the
Various means
for supporting such a key strip while the con - A ?at head bolt passes through the-end 4 and the
crete is poured and being rammed have been em
back strap to hold the enclosed strip ?rmly by a
ployed in the prior art, such as hanging it from nut ‘l.
a'goose neck mounted above the form; another
The key strip'is thus ?rmly held and supported
15 ‘ with pronged nails; and another bolts to the
midway of the proposed thickness of the slab and
rests on the shoulder 8 of the strap, so that the
'10 other half slab when it is laid.
My invention provides for setting the key strip
after the grade is ?nished and offers a ?rm sup
port for the key strip, which support does not
extend above the form and is not liable to inter
ference by the power graders and planer, nor
while pouring the slab; my key strip is ?rmly sup
ported against the inner face of the adjacent
form without connecting bolts, is maintained in
proper position while the concrete is being
rammed; and is readily disengaged from the slab
after the concrete has set, with little or no dam
age to the key strip or its support, so that it pro
motes continual use of the key strip with resultant
In the accompanying drawing in which like
reference numerals indicate corresponding parts,
Fig. 1 represents a perspective view of a con
crete slab with a form and key strip in place, and
my improved support ready for removal of the
strip after the concrete has set;
Fig. 2 an enlarged view of a portion of the
Fig. 3 a plan view showing a portion of a form
.10 partly in section, a key strip having my support,
and a stake in section below the prong, holding
the strip close to the inner face of the form ready
for pouring and ramming the concrete;
Fig. 4 a side view of my stake and its prong;
Fig. 5 a back view of the same; and
Fig. 6 a top view of the stake.
strip will maintain its position while the concrete
is being rammed above and below it.. The upper
end of the strap support may be otherwise formed
in connection with the leg, and secured to the
key strip in any suitable manner.
The foot 6 under the form (see Fig. 3) holds
the leg and strip from rising, and the foot also
supports them from the ground while the con
crete is beingrammed above and below said strip.
As a further assurance of the strip remaining 1
in contact with the inner face of the adjacent
form while the concrete is being poured and
rammed, I provide a stake 9 having a beveled
point II and a lateral prong ID near its top that
engages the top of the support or otherwise, when
driven into the ground adjacent the key strip.
The beveled point ll causes the stake, when
driven, to incline toward the key strip and press
it against the face of the form, while the prong
assists the foot 6 in holding down the strip.
The preferred form of said stake is shown in
the drawing and consists of a curved semi-cylin
drical stake with a beveled point H and lateral
prong l0 formed by punching outward a portion I,
of the back as indicated in Figs. 4, 5, and 6. The
prong may be otherwise formed.
The open side of this stake ?ts over the nut ‘l
and is guided thereby while being driven down
Referring to the drawing, the numeral I indi
Ward until the prong engages the strap surround
ing the V-strip, or otherwise, and when thus em
bracing the nut ‘! the stake is held against dis
cates a slab of concrete as laid for half of the
width of the road having a form 2 at its inner
placement sidewise.
The strip and the leg of the support being
edge and wooden key strip 3 (commonly known
as a V-strip) for forming a longitudinal groove
in the inner edge of the slab.
Said groove is ?lled by the concrete when the
adjacent slab is poured and keys the two slabs to
gether on the center line of the road.
1.; Cl
thus held close to the inner face of the form, are _
not separated from it by any concrete getting
down between such faces in contact as above
described. Therefore, when the concrete has set
and the form is removed, the key strip and my
support therefor, is exposed as shown in Figs. 1
and 2. It is common practice in other forms of
key supports, to drive a chisel or crowbar into
the key strip in order to pry it out of its groove.
My method provides a better way in which the
key strip is preserved in its undamaged condi
tion. In the foot extending from the bottom of
the leg of my support, I provide a hole l2 which
is exposed to view upon removal of the form as
above stated. A pointed rod inserted in this hole
12, allows of springing outward the leg and V
strip secured to the top of the support without
actual contact of any chisel or crowbar with the
strip itself. By such means as I have just de
scribed, the wooden key strip is preserved in un-'
damaged condition for continued use.v The metal
stake I have described, being driven below. the
surface of the concrete slab remains in its posi
tion as set in the concrete and is not subject to
removal. As stated above, the stake assists the
foot 6 in holding down the key strip and the
prong supplements the foot 6 in maintaining the
key strip in proper position against the inner face
of the adjacent form.
Having thus fully described my invention, what
I claim as new vand desire to secure by Letters
Patent, is:
1. The combination with a wooden key strip,
of a support consisting of a ?at metal bar bent
at its upper front end to embrace said strip and
30 let in flush with the outer face of said strip, and
vided with a hole for disengaging said support
and key strip from the set concrete, substantially
as described.
3. In combination with a key strip for con
crete slabs, of a metal support secured by its up
per end to said strip and having a leg extending
downward having its outer face in the same ver
tical plane as the outer face of said strip and
having a foot extending outward to be disposed
,under an adjacent form to support said strip 10
from the ground, and a stake to be driven adja
cent said strip to press it against an adjacent
form and having a lateral prong to hold down the
key strip, substantially as described.
4. In combination with a key strip and a sup 15
port therefor having a leg the lower end of which
is adapted to engage the ground and having its
upper end secured by a bolt through the strip
with a nut on its rear end, of a semi-cylindrical
stake embracing said nut and guided thereby
when driven into the ground adjacent said strip
to press said strip against an adjacent form.
5. In combination with means to support a key
strip for concrete slabs, of a stake having a
beveled point adapted to slant the stake toward ~25
the key strip while being driven into the ground,
and having a lateral prong near its upper end
adapted to engage and to hold down said strip
and limit the depth driven, substantially as de
,; 30
6. The combination with a form for a con- '
then over the top, down behind, and under the
crete slab and a key strip disposed against the
strip, and then extending downward in the same
inner face of the form, of a concrete strip support
vertical plane as the said upper front end form
consisting of a supporting bar adapted to be se—.
ing a leg, and having a right-angled foot extend
ing outward to be disposed under an adjacent _ cured to said strip and characterized by a verti-r 35
cal leg having its outer face disposed substantially
form and support said strip from the ground.
2. The combination with a concrete key strip in the same plane as the inner face of said form
of a support secured at its upper end to said
strip and extending downward to form a verti
cal leg the outer face of which leg is in the same
and having at its lower end an outwardly pro
jecting foot adapted to rest on the ground and
plane as said strip to allow the strip to contact
with an adjacent form, and having a right-angled
foot extending outward at the grade surface pro
tially as described.
support said key strip, in said position, substan
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