United States Patent
[72]
Inventor
1H1 3,561,721
Ernest ll. Self
[56]
Birmingham, Ala.
[21] Appl. No. 751,552
[22] Filed
Aug. 9, 1968
[45] Patented Feb. 9, 1971
[73] Assignee Vulcan Metal Products, Inc.
References Cited
UNITED STATES PATENTS
1,945.784
3,429,241
2/1934
2/ l 969
Myer .......................... ..
Burton ....................... .,
52/155X
94/17
Primary Examiner—.l. Spencer Overholser
a corporation of Alabama
Assistant Examiner-DeWalden W. Jones
Att0rney—Jennings, Carter & Thompson
[54] JOINT MEMBER FOR CONCRETE SLABS
3 Claims, 4 Drawing Figs.
[52]
[51]
[50]
[1.8. CI ...................................................... ..
249/9,
ABSTRACT: A-joint member for concrete slabs embodying a
249/3, 25/ l 18, 52/155, 94/17
vertical stake carrying an ear extending upwardly alongside
Int. Cl....................................................... .. EOlc 11/02
Field of Search .......................................... .. 249/9, 5, 3,
and in Spaced relation to the stake for receiving therebetween
a portion of a screed sheet- A barb carried by the ear extends
2,219, 101, 98;25/l3lCM, 118W, 118M; 52/155;
toward the stake and cuts into a side of the screed sheet in
3,561,721
2
1
JOINT MEMBER FOR CONCRETE SLABS
To further attach thestake 19 to the sheet member 10, ver
tically spaced openings 27 are provided in the stake 19in posi
tion to be in'alignment with the lower portion 12 of the sheet
member 10 for receiving suitable securing elements whereby
BACKGROUND OF THE INVENTION
This invention relates to a joint member for concrete slabs
and more particularly to concrete slab key-joining forming
the, lower portion 12 is secured to the stake; The securing ele
members for use in the construction of concrete slabs for
ments may be in the form of wire members, nails or the like
roadways, ?oors, runways and the like.
An object of my invention is to provide a joint member
wherein the key-joint forming member in the form of a screed
commonly used in the attachment of stakes to concrete form
members.
'
From the foregoing description, the construction and use of
my improved joint member for concrete slabs will be readily
understood, The stakes 19 are driven into the prepared sub
sheet is positively secured to a supporting stake.
A more speci?c object of my invention is to provide a joint
member for concrete slabs of the character designated in
grade in a manner well understood in the art to which my in
which the supporting stake carries barb supporting members
vention relates with the upper ends of the stakes spaced
which hold the barbs in position to cut into a side of the screed
sheets upon insertion thereof between the stake and its as
sociated barbs.
gitudinally relative to each other so that they are in alignment
with the openings 17 provided in the sheet members 10. The
A still further object of my invention is to provide a joint
member for concrete slabs ,of the character designated which
whereby the cars 18 pass upwardly through the openings 17
uniformly below grade level. The stakes 19 are positioned lon
sheet members 10 are then positioned on the stakes 19
shall be extremely simple of construction, economical of 20 with the upper planar portion 11 between the ears 18 and the
adjacent side of the spike 19, as shown in FIG. 2. As the upper
portion 11 is forced downwardly between the barbs 26 and the
upper portion of the stake 19, the barbs cut into the upper
Apparatus embodying features of my invention is illustrated
portion 11 to ?rmly secure the upper portion 11 between the
in the accompanying drawing, forming a part of this applica
tion, in which:
'
25 upstanding ears 18 and the stake 19. The member 10 is moved
downwardly relative to the stake until the bent over portion 14
FIG. 1 is a side elevational view, partly broken away, show
is at grade level.
ing the vertical stake secured to an elongated screed member
From the foregoing, it will be seen that I have devised an im
which is employed as a key-joint forming member between ad
proved joint member for concrete slabs which is particularly
jacent slabs of pured concrete to form a tongue and groove in
30 adapted for forming a key contraction joint between adjacent
terlocking joint therebetween;
FIG. 2 is a sectional view taken generally along the line 2-2
concrete slabs. By ?rmly anchoring the elongated sheet
of FIG. 1;
member 10 between the ears 18 and the adjacent side of the
FIG. 3 is an enlarged, fragmental view showing the upper
stake, due to the cutting action of the barbs 26 into the side of
portion of the stake with the screed member being omitted for
the upper portion 11, the elongated sheet member 10 is accu
35 rately positioned on the stakes and secured thereto with a
the sake of clarity; and,
.
FIG. 4 is a top plan view of the stake.
minimum of other securing means. The openings 27 are pro
Referring now to the drawing for a better understanding of
vided in the stake 19 for receiving an additional securing ele
my invention, I show a key-joint forming member 10 in the
ment merely to restrain any pivotal movement of the upper‘
form of a sheet metal screed member which may be formed of
portion of the stake relative to the opening 17. That is, the
any suitable material. The elongated screed member 10 com
openings 27 assure that the barbs 26 remain in firm contact
prises upper and lower, vertically extending coplanar portions
with the cut portions formed in the adjacent surface of the
11 and 12, respectively, which are connected to each other by
upper portion 11. Also, by providing the anchoring of the
an intermediate, laterally disposed key deformation portion
barbs 26 into the cut portions of the upper portion 11, the
13. The upper edge of the upper planar portion 11v is folded I overall structure‘is sturdy and positions the stakes accurately
over on itself as at 14 to provide a downwardly extending
in at right angles to the upper edge of the forming member 10.
?ange 16 which lies adjacent the upper portion 11, as shown
While I have shown my invention in but one form, it will be
in FIG. 2, to de?ne a narrow, longitudinal edge which extends
obvious to those skilled in the art that it is not so limited, but is
manufacture and one which may be assembled in a minimum
of time.
.
_
.
at grade level. By forming the ?ange 16 adjacent the upper
portion 11, no void isleft therebetween.
>
Longitudinally spaced openings 17 are provided through
susceptible of various other changes and modifications
50 without departing from the spirit thereof,
the sheet member 10 adjacent the juncture of the upper planar
portion II and the key defomiation portion 13 for receiving
earlike members 18 carried by a vertically extending stake 19.
1. In an article of manufacture used in supporting an elon
gated vertically extending screed sheet for forming a contrac
tion joint between adjacent concrete slabs:
Preferably, the earlike members 18 are punched out of the 55
a. a vertically extending stake;
b. at least one earlike member carried by an upper portion
metal forming the stake 19, as shown in FIG. 1, by short lateral
of said stake and extending upwardly alongside and in
slits 21 which intersect with longitudinally extending slits 22 to
spaced relation to the adjacent side of said stake for
provide an earlike member 18 at each side of the stake 19 ad
jacent the upper portion thereof. As shown in FIGS. 2 and 3,
receiving a portion of said screed sheet therebetween;
each earlike member 18 extends laterally as at 23 and then up 60
wardly as at 24 in spaced relation to the adjacent side of spike
19 whereby it is in position to pass upwardly through an ad
jacent opening 17 and extend alongside the opposite side of
the upper planar portion 1 1 from the side thereof abutting the
stake l9.
.
,
Sharp barb members 26 are carried .by the inner surface of
each upstanding earlike member 18, as shown. Each barb 26
extends inwardly toward the adjacent side of the stake 19 a
distance to cut into the adjacent side of the sheet member 10
upon movement of the upper portion 11 thereof downwardly
and
a barb member carried by said earlike member extending
horizontally inward toward said adjacent side of said
stake a distance to cut into the side of said screed sheet
upon insertion of said portion of the screed sheet between
said barb member and said adjacent side of the stake to
secure said adjacent portion of the screed sheet
therebetween.
2. An article of manufacture as de?ned in claim 1 in which
each earlike member is punched out of the material forming
70 the stake with each earlike member extending laterally from
65
and then upwardly alongside said upper portion of the stake.
3. In a concrete form for forming a key contraction joint
the adjacent surface of the upper portion 11 of the sheet
between adjacent concrete slabs wherein a plurality of stakes
member, the sheet member is secured ?rmly to the stake 19
are set with their upper ends spaced uniformly below grade
due to the wedging action of the barbs 26 into the cuts fonned
75 level at spaced apart intervals:
in the side of the upper portion 1 l.
between the ears l8 and the stake 19'. As the barbs 26 cut into
3,561,721
3‘
4
a. an elongated sheet member having spaced apart upper
and lower vertically extending coplanar portions abutting
the Stakes and Connected to each other by an inter‘
wardly from and in spaced relation to each stake in p0si~
tion to pass upwardly through an adjacent one of said lon
gitudinally spaced openings alongside the opposite side of
mediate, laterally disposed key deformation Portion?
said upper planar portion from the side thereof abutting
b. the upper edge of the upper planar portion being folded 5
over on itself and extending downwardly against said
upper planar portion to de?ne a narrow, longitudinal .
edge extending at grade level;
0. there being longitudinally spaced openings through said
sheet member adjacent the juncture of said upper planar l0
portion and said key deformation portion;
d. at least one earlike member extending laterally and up
25
35
40
45
55
65
75
1 the Stakes; and
'
e. a barb member carried by each earlike member extending
toward said opposite side of said upper planar portion a
distance to cut into said opposite side and secure the ad
jacent portions of said upper planar portion between said
barb member and its stake.