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Патент USA US3078545

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Feb. 26, 1963
w. E. HEDDERICH ETAL
3,078,535
WIRE CLAMP
Filed June 15. 1960
3 Sheets-Sheet 1
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3,d78,535
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Patented Feb. 26, 1963
2
plane of line 3~—-3 of FIG. 2 and illustrating a plan view
3,078,535
‘WERE CLAM?
William E. iiedderich, l’oel A. .l'annenga, Carl Ray Carl
son, and Donald E. l-llnwlrinson, Rockford, Ill., assign
ors to Grecnlee Bros. 6%: £10., Rockford, Ill., 2: corpora
tion of Kitinois
of clamps embodying the present invention.
FIG. 4 is a section view through a clamp embodying
the present invention taken substantially in the plane of
line 4-4 of FIG. 3 and showing a wire engaged by the
clamp.
Filed .liune 13, 1960, See‘. No. 35,699
b’ Qiaims. (6!. 24-126)
FIG. 5 is a view similar to FIG. 4 but illustrating the
clamp in an open position.
The present invention relates broadly to wire clamps
and more speci?cally to clamps ?nding particular, but
showing a clamp in partial stages of disassem-bly.
FIG. 8 is a perspective view of the jaws of the clamp
shown in FIGS. 3-7.
not necessarily exclusive use for holding steel wire or
rods under tension during the manufacture of prestressed
FIGS. 6 and 7 are section views similar to FIG. 5 but
FlG. 9 is a section View taken substantially inthe
concrete beams.
plane of line 9—9 of FIG. 4 and illustrating the clamp
In the production of prestressed concrete structural
shapes such as beams, the concrete is provided with steel
reinforcing members which are pretensioned while the
FIG. 10 is a fragmentary section view similar to FIG‘.
9 but showing the clamp in a fully released position.
beam is being cast and are held in this tensioned con
dition when the concrete has hardened. For the manu
FIG. 11 is a section view taken substantially in the
plane of line 11—11 of FIG. 10.
FIG. 12 is a perspective view of the mechanism for
facture of prestressed concrete beams which are extreme
ly large, such as the types now widely employed in bui1d~
ing construction, continuous casting machines are em
operation.
clamping the jaws shown in FIG. 8.
ployed which are capable of forming long lengths of
Concrete beams, such as the type shown at 10 in FIG.
1, are cast in a suitable apparatus, the details of which
ing the casting of the beam, the pretensioned steel wire
concrete beam.
have not been shown. In general, typical apparatus in
beams. In apparatus of this character steel wire or rod
is supplied from a continuous source such as a reel, and 25 cludes a mechanism for supplying and pretensioning
steel reinforcing members 11 which are embedded in the
is fed through a tensioning and cut-off mechanism. Dur
must ‘be clamped in place on both sides of the beam.
Because the concrete beams cast are
usually quite long, the mechanism is supported on a
gantry type carriage which straddles the beam casting
Various clamping mechanisms have been proposed for
this purpose, although the results have not been entirely 30 mechanism and travels on rails in traversing the length
of the beam. A portion of such a mechanism is shown in
FIG. 2, the mechanism for engaging and ‘gripping the
The general object of the invention is to provide a new
free end of the reinforcing wires 11 being indicated
and improved wire clamp which is made from a small
generally at 14 and the wire supply, feed, cut-oif, and
number of simply formed parts so as to be comparatively
inexpensive, which is rugged and durable in service use 35 tensioning mechanism being indicated generallyv at 15.
Some means, such as a feed screw 16 is usually provided
and which is easily assembled and disassembled for
for raising and'lowering the mechanisms 14, 15'. The
cleaning.
reinforcin17 rod or wire 11 is fed from a supply source
A more detailed object is to make the clamp from sim
satisfactory.
such as a reel (not shown) and is cut to length as it is
ple sliding blocks which Wedge the wire between the
.‘
,
jaws of the clamp and which are securely held in their 40 used.
For securely gripping the reinforcing wires or rods,
operative positions even though they may be removed
an improved clamping device is provided, a pair of such
without the use of special tools.
devices 2%, 21 being shown on opposite sides of the
_ Another object of the present invention is to facilitate
beam casting station, for use in conjunction with the
the insertion of the reinforcing wire into the clamps so
that the castin0 operation can be made substantially 45 wire tensioning mechanism in order to hold the preten
sioned wires while the concrete beam is formed, which
automatic and continuous and to provide a positive yet
readily releasable grip on the wire which positively holds
the wire when it is under tension.
Still another object of the invention is to facilitate the
clamping devices are capable of holding the wires posi
tively .and surely during the casting operation and can
be readily released after the beam has set. The clamps
cleaning of the component parts of the wire clamp by 50 2t), 21, are mounted adjacent the casting station on suit
able supports such as spaced vertical l-beam posts 22,
utilizing planer surfaces in the construction thereof. A
23., Generally, asecond pair of clamps 2d, 25 is pro
like object is to provide a wire clamp of the foregoing
vided at each station vertically displaced from the ?rst
type'which has few movable parts thereby further re
pair so that a second set of reinforcing rods can be em
ducing the possibility of fouling and faulty operation
caused by collection of concrete vthereon and further 55 ployed. This is important when, as shown in the draw
ings, the beams are cast with upper and lower preten
facilitating the cleaning of the clamp.
sioned rods therein. Because the clamps 20, 21, 24 and
A further object of the invention is to provide a clamp
25 are identical, only one will be described in detail,
having the foregoing charac‘eristics in which the active
it being understood that the description applies as well to
clamp surfaces are protected against the entrance of con 60 the remaining clamps.
crete.
‘
Each clamp comprises a body or clamp body 28 mount~
Other objects and advantages of the present invention
able on the support posts 22 (FIG. 3) and de?ning at each
will become apparent as the following description pro
end a slot 29, 3d for receiving the clamping mechanism
ceeds taken in connection with the accompanying draw
proper. By forming the clampbody 23 with a clamping
ings wherein:
mechanism at each end and mounting it at its center on
FiGURE 1 is a perspective view of a concrete beam of
the support post, two reinforcing wires can be tensioned
the character produced by the mechanism with which the
simultaneously. In addition, because two pretensioned
clamps embodying the present invention are employed.
wires are gripped at one time, the structure is more rigid
in that twisting of the support posts 22 is avoided. The
PEG. 2 is afraginentary elevation view of a mechanism
for tensioning reinforcing wire or rods in a concrete 70 clamp body 28 is secured to the support posts by suitable
beam.
FIG. 3 is a section view taken substantially in the
nut and bolt fasteners 31.
To grip the reinforcing wire 11, each clamp includes
3,078,685
4
3
two blocks 39 and 40 disposed side by side in the slot 29.
The cooperating tapered surfaces between the wedge
Opposed surfaces 41 and 42 of the blocks are serrated or
block and the wedge jaw are clearly illustrated in FIG. 12.
The slope of the tapered surfaces on the jaws is small so
that an extremely powerful clamping force can thereby be
knurled to bite into and securely grip the wire whereby the
blocks constitute the jaws of the clamp. The upper edges
of the blocks are charnfered to provide sloping surfaces
obtained for a relatively small closing movement of the
44 which guide the Wire into the slot between the jaws and
jaws. It will be appreciated that the clamping and jaw
into position to be gripped.
Normally, the block 39 abuts against the wall 32 of the
image of the other. With this construction the movable
slot 29 as shown in FIG. 4 and the block 40 is forced
wedge blocks are towards the center of the clamp block
mechanism at each end of the clamp block 28 is a mirror
laterally toward the block 39 by a wedge block 50. The 10 and remain always at a substantial ?xed distance apart.
With this position known the clamp is admirably suited
latter also is disposed in the slot and acts between the wall
33 and the back of the block 40. For this purpose, the
for use with an automatic clamping mechanism which can
back of the block 40 is formed with an inclined or tapered
surface 48 which bears against a mating surface 49 on the
jaws at one time.
be stopped in front of the body and actuate both sets of
One illustrative mechanism for actuating and releasing
wedge 50 so that, as the wedge is moved longitudinally to
the clamps is shown in FIG. 2. This mechanism com
the left as viewed in FIG. 8, the block 40~is shifted later
prises a hydraulic plunger mechanism 55 having a member
ally toward the block 39.
55 on one end thereof engageable with :1 depending ?ange
Depending from the ends of the block 39 are ?anges
52 on the end of the wedge block 59. The plunger mem
45 which are spaced apart a distance generally equal to
the width of the clamp body 23 so that they ‘straddle the 20 ber 56 is preferably formed with a slot which slides be
neath and straddles the ?ange 52. The clamp is con
bottom wall 34 and prevent endwise shiftingof the block
structed to be actuated to clamp the wire by moving the
39 while permitting the latter to slide sidewise. Similar
wedge block up as viewed in FIG. 9. In operation, the
?anges 46 depend from the ends of the block 40. The
wire will be fed across the beam mold and gripped in
wedge 50 is longer than the blocks and also is formed-with
depending ?anges 52 which are spaced apart farther than 25 clamps 20 at one side of the beam. A tension of the de
sired magnitude will be applied to the wire and clamps 21
the ?anges 45 and 46 to permit limited endwise sliding of
engaged to hold the wire in place. The wire is then
the wedge.
severed and the wire feeding and clamping mechanism
To prevent the blocks 39, 40 and 50 from being re
will be moved to the next or to a lower station.
moved from the slot 29 during normal service use, shoul
When the beam has been cast, the clamps can be
der members or ?anges 35 and 36 project inwardly from 30
readily released by engagement with the mechanism 55.
the upper ends of the walls 32 and 33 respectively. The
This mechanism pushes on one end of the wedge block,
flange 35 is comparatively short and projects in closely
preferably with a hammer-like blow, to release the clamp
over the block 39. The ?ange 36 ?ts closely over the
ing force and enable the wire to be withdrawn from the
wedge 50 and extends over substantially the full width of
clamps.
the latter. A third ?ange 51 projects in from the upper
It will be observed that a clamp constructed in accord
end of the wedge and over the block 40. ‘Thus, the ?ange
ance with the invention is comparatively inexpensive
35 holds the block 39 in the slot, the ?ange 36 retains the
since all the parts are easily made and require no drilling,
wedge 50 and the ?ange 51 holds the block 40. These
tapping or other similar operations. Moreover, the clamp
three ?anges, together with the ?anges 45, 46 and 52,
serve the added function of preventing concrete from 40 is easy to assemble and disassemble but, at the same time,
the parts are securely held in their operative positions
splashing onto the various sliding surfaces and thereby
during service use. In addition, the clamp when used with
prevent the clamp from fouling.
the manufacture of prestressed concrete beams is protected
The wire clamping action of the wedge block 50 and
against fouling which might otherwise be caused by con
crete splashings.
jaws 39 and 40 is illustrated in FIGS. 9, 10 and 11. ‘ The
wedge block is suf?ciently long so that it may be slid to
one extreme and thereby release the jaws for separation
su?icient to permit the insertion or removal of a rein
forcing wire.
We claim as our invention:
1. A wire clamp comprising an elongated clamp body
having a pair of opposed walls and a bottom surface
de?ning an upwardly directed transverse slot in said
clamp body, a ?rst jaw member positioned in said slot
against one of said walls and the slot bottom, said jaw
member having a wire gripping surface and an upward
. 1y chamfered surface extending therefrom, a pair of shoul
ders depending from said jaw member and slidably en
55 gaging the sides of said body, a second jaw member po
Upon movement to the other extreme, as - i
shown in FIG. 9, the tapered surface 49 of the wedge
block engages the corresponding surface 48 of the jaw 40
and thereby earns the jaws together into gripping engage
ment with the reinforcing wire 11. The serrated edges of
the jaws bite into the wire and securely hold the same,
even when the wire has been placed under considerable
tension.
According to another aspect of the invention, the sizes
of the ?anges 35 and 36 are correlated in a novel manner
sitioned in said slot adjacent said ?rst jaw member and
having on one side a wire gripping surface and a cham
fered surface extending upwardly therefrom opposed to
with the sizes of the blocks 39, 40 and 50 so that the
the corresponding surfaces on said ?rst jaw member, a
blocks may be removed from the clamp body 28 while
normally being retained in the slot 29. For this purpose, 60 pair of shoulders depending from said second jaw mem
ber and slidably engaging the sides of said body, said sec
the length of the ?ange 35 is such that, when the narrow
ond jaw member having on the opposite side a surface
end portion of the wedge 50 engages the block 40 and
tapered with respect to the wire gripping surface, a
there is no wire between the jaws, the block 39 can be
wedge block member interposed between said second jaw
moved out from under the ?ange 35 as shown in FIG. 6
and lifted out of the slot 29. In any other position of the 65 member and the other slot wall and having a tapered sur
face corresponding to said tapered surface on said sec
wedge, however, the ?ange 35 holds the block 39 in place
ond jaw member, ?anges projecting inwardly from each
as illustrated in FIG. 6.
of said walls over the members adjacent thereto, and a
. After the block 39 has been removed, the block 40 may
?ange on said wedge block member extending over said
he slid out from under the ?ange 51 and lifted out of the
slot 29. Next, the wedge 50 is moved over to the position 70 second jaw member, said ?anges holding said jaw mem
bers and said block in said slot.
shown in FIG. 7 in which it is alined with the space be
2. In a wire clamp, the combination of, a clamp body
tween the ?anges 35 and 36. This space is made slightly
de?ning an upwardly directed slot having vertical trans
greater than the width of the wedge so that the latter may
be lifted out of the slot. The reverse procedure is fol
verse walls, a pair of jaw members positioned in said
lowed to assemble the clamp.
75 slot ‘adjacent one wall for gripping a wire ‘and having
3,078,535
5
end portions depending alongside said body, one of said
jaws having a tapered wedge surface, a wedge block in
said slot between said jaws and the other wall and having
a wedge surface cooperable with said jaw wedge surface
upon relative sliding movement with respect thereto to
urge the jaws together into gripping engagement with the
wire, shoulder members on said clamp body overhanging
said walls, and a shoulder member on said wedge block
6. In a wire clamp, the combination of, a clamp body
having an upwardly opening slot de?ned by spaced ver
tical walls and a bottom surface, ?rst and second jaws
disposed in said slot with said ?rst jaw against one of
said walls, said jaws having opposed faces for gripping
a wire, the back of said second jaw having a tapered
wedge surface, a wedge disposed in said slot between said
second jaw and the other of said walls and having nar
row and wide ends to de?ne a wedge surface cooperating
overhanging said tapered surface, said shoulder mem
bers normally preventing removal of the jaw members 10 with the wedge surface on said second jaw thereby to
urge the second jaw toward the ?rst jaw, a ?rst ?ange
and wedge block from said slot.
projecting laterally from said one Wall to overlie said
3. In a wire clamp, the combination of, a clamp body
?rst jaw, a second ?ange projecting laterally from said
de?ning a slot, :1 pair of jaw members positioned in said
other wall to overlie said wedge, and a third ?ange
slot for gripping a wire, one of said jaw members having
a tapered wedge surface, a wedge block disposed in said 15 projecting laterally from said wedge to overlie said sec
ond jaw whereby said three ?anges retain said jaws and
slot adjacent said one jaw member and having a wedge
said wedge in said slot.
surface cooperable with said jaw wedge surface upon rela
7. in a wire ‘clamp, the combination of, a clamp body
tive sliding movement with respect thereto to urge the
having an upwardly opening slot de?ned by spaced verti
jaws together into gripping engagement with the wire, a
?rst shoulder member on said clamp body overhanging 20 cal walls and a bottom surface, ?rst and second jaw-s dis
said wedge block, a second shoulder member on said
posed in said slot with said ?rst jaw against one of said
wedge block overhanging the adjacent one of said jaw
walls, said jaws having opposed faces for gripping a wire,
the back of said second jaw having a tapered wedge sur
face, a wedge disposed in said slot between said second
and overhanging the other of said jaw members, said
shoulder members normally preventing said jaw members 25 jaw and the other of said walls and having narrow and
wide ends to de?ne a wedge surface cooperating with the
and said block from being removed from said slot.
wedge surface on said second jaw thereby to urge the
4. in a wire clamp, the combination of, a clamp body
second jaw toward the ?rst jaw, a ?rst ?ange projecting
de?ning an upwardly opening inverted T~shaped slot
members, and a third shoulder member on said body
formed by a pair of vertical transverse walls and opposed
laterally from said one wall to overlie said ?rst jaw, a
members overhanging said walls, a pair of jaw members
positioned in said slot with one of said jaws adjacent one
second flange projecting laterally from said other wall
to overlie said wedge, and a third ?ange projecting
laterally from said wedge to overlie said second jaw
whereby said three ?anges retain said jaws and said
wedge in said slot, said ?rst jaw being movable in under
the space between said ?rst and second ?anges when the
of said walls and below one of said overhanging mem
bers, said jaw members having opposed gripping surfaces
for holding a Wire and having end portions depending
alongside said clamp body, the other of said jaw mem
bers having a tapered wedge surface, an L~shaped wedge
block having one leg positioned in said slot between said
other jaw and the opposite slot wall and beneath the
other of said overhanging members, the other leg of
said block overhanging said other jaw and said block hav 40
disposed in said slot with said ?rst jaw against one of
ing end portions depending alongside said clamp body,
said walls, said jaws having opposed faces for gripping
said wedge block further having a tapered wedge sur
face cooperable with said jaw wedge surface to urge the
latter into gripping engagement with a wire upon relative
transverse sliding movement between said wedge block
and said jaw.
5. in a Wire clamp, the combination, a clamp body
narrow end of said wedge engages said second jaw.
S. In a wire clamp, the com ination of, a clamp body
having an upwardly opening slot de?ned by spaced ver
tical walls and a bottom surface, ?rst and second jaws
a wire, the back of said second jaw having a tapered
wedge surface, a wedge disposed in said slot between
said second jaw and the other of said walls and having
narrow and wide ends to de?ne a wedge surface cooperat
ing with the wedge surface on said second jaw thereby
to urge the second jaw toward the ?rst jaw, a ?rst ?ange
projecting laterally from said one wall to overlie said
de?ning an upwardly opening inverted T-shaped slot
?rst jaw, a second ?ange projecting laterally from said
formed by a pair of vertical transverse walls and opposed
members overhanging said walls, a pair of jaw members 50 other wall to overlie said wedge, and a third flange pro
jecting laterally from said wedge to overlie said second
positioned in said slot with a ?rst one of said jaw mem
ja-w whereby said three ?anges retain said jaws and said
bers adjacent one of said walls and below a ?rst one of
said overhanging members, said jaws having gripping
wedge in said slot, said ?rst and second ?anges de?ning
a space slightly larger than the overall width of said
surfaces for holding a wire and having end portions de
pending alongside said clamp block, the second of said 55 wedge and said ?rst jaw being movable in under said
space when the narrow end of said wedge engages said
jaws having a tapered wedge surface, an L-shaped wedge
second jaw.
block having one leg positioned in said slot between said
second jaw and the opposite slot wall and beneath the
References {Zited in the ?le of this patent
second one of said overhanging members, the other leg
of said block overhanging said one jaw and said block
UNITED STATES PATENTS
having end portions depending alongside said clamp
body, said wedge block being narrower at one end to
provide a tapered wedge surface cooperable with said jaw
wedge surface to urge the latter into gripping engage
ment with a wire upon relative transverse sliding move
ment between said wedge block and said jaw, said ?rst
jaw being movable out from under said ?rst overhang
ing member when the narrow end of said wedge block
engages said second jaw.
769,878
1,079,646
1,793,140
2,204,979
2,245,316
2,318,507
2,548,712
2,729,869
Sturgis _____________ __ Sept. 13, 1904
Hansen _____________ __ Nov. 25,
Steinmayer __________ __ Feb. 17,
Buchanan ___________ __ June 18,
Amsler _____________ __ June 10,
Martin ______________ __ May 4,
Firmin ______________ __ Apr. 10,
Huyser ______________ __ Jan. 10,
1913
1931
1940
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1956
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