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Патент USA US3092895

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June 11, 1963
E. GQM. DYKEMAN ETAL
3,092,886
APPARATUS FOR MOLDING CONCRETE T-BEAMS
Filed May 1l, 1959
3 Sheets-Sheet 1
IOO
'A
F'IE_E
INVENTORS
EDGAR G. M. DYKEMAN
JOHN N. KELLEY
ATTQRNEY
June 11, 1963
E. G. M. DYKEMAN ETAL
3,092,886
APPARATUS FOR MoLDING CONCRETE T-BEAMs
Filed May 11, 1959
3 Sheets-»Sheet 2
F'IE_:EI
46j
(54)
IF " I E _ ¿_l
I
_ IE.-
INVENTORS
EDGAR G. M. DYKEMAN
JOHN N. KELLEY
BVM
ATTORNEY
`lune 1l, 1963
3,092,886
E. G. M. DYKEMAN ETAL
APPARATUS FOR MOLDING CONCRETE T-BEAMS
Filed May 11, 1959
3 Sheets-Sheet 3
Ni
INVENTORS
EDGAR G. M. DYKEMAN
JOHN N. KELLEY
BY
/ULfW'VWLV-‘ÄÁ
ATTORNEY
United States Patent O "ice
1
ßßdäßâä
Patented .lune 11, 1963
2
of the connected sections 12 are closed at their outer
3,092,886
APPARATUS FOR MOLDING CONCRETE T-BEAMS
Edgar G. M. Dykeman, Riverside, and lohn
Kelley,
Arlington, Calif., assigner-s to FMC Corporation, a cor
poration of Delaware
Filed May 11, 1959, Ser. No. 824,446
6 Claims. (Cl. 25-121)
This invention relates to concrete structural members
ends by end plates 19 (FIG. 7), thus completing an open
topped elongate molding cavity for receiving green con
crete.
-Stressing members such as cables 2Q (FIGS. 1
and 7) may be placed in the cavity of the form if pre
stressed beams are to be cast. The dimensions of the
mold section 12 can be varied so that beams ‘22 (FIG.
l) of various sizes can be produced therein; and since a
plurality of the sections 12 are in end-to-end relation, the
and in particular pertains to apparatus for molding con
crete beams of T-shaped cross-section.
T-beam molding apparatus presently in use is cumber
some and expensive and does not provide ilexibility in
apparatus is adapted for the production of several beams
22, 22a and 22h (FIGS. l and 7) concurrently in the
elongate molding cavity. The elongate cavity can be
partitioned at intervals to provide several individual beam
the number or in the dimensions of the beams that can
molding cavities 23 of desired length. The beam stress
be molded therein. Costly auxiliary equipment such as 15 ing cables Ztl (FIGS. 1 and 7) extend the entire length of
cable tensioning devices are tied up with each new beam
until the concrete has hardened and this further adds to
the costs. Leakage of the concrete being molded in
the elongate molding cavity and are common to all of the
beams being cast at one time in the several individual
molding cavities 23. The cables are anchored at one end
of the molding apparatus 19 and are all tensioned by a
presently used apparatus is also frequently a factor that
contributes to the cost of using such apparatus, particu 20 single tensioning device located at the other end of the
larly when vibration is resorted to to eliminate voids in
apparatus 1t).
’
the concrete.
Each molding section 12 (FIGS. 1-4) of the apparatus
Another object is to provide an improved apparatus for
10 is supported on the concrete casting bed 3 (FIG. 1)
molding concrete beams.
as above stated. The side forming members 14 which
Another object of the invention is to provide molding 25 comprise the section 12 are of identical construction and
apparatus which is adjustable to permit variation of the
therefore only one will be described. They face each
dimensions thereof so that beams of various sizes can be
other and are separated sufficiently to accommodate the
cast therein.
support member or pallet 1S between them. Each of the
Another object of the invention is to provide beam
side molding members 14 is constructed of a steel sheet 24
forming apparatus including side molding members which 30 (FIG. 2) bent longitudinally to provide a vertical wall 2S
can easily and quickly be tilted into a spread apart rela
(see FIGS. l and 3), a narrow oblique wall 30 and a
tionship to facilitate removal of a cast beam from the
substantially horizontal wall 32. The slab of a beam 2‘2
mold, and which can easily and quickly be returned to
may be made to taper toward the outer edges thereof by
their position for use in pouring another beam.
slightly inclining the walls 32 upward and outward.
Another object of the invention is lto provide concrete 35 Triangular reinforcing plates 34 (FIGS. 1, 3 and 4) are.
molding apparatus which is not subject to excessive con
welded to the walls 23, 30 and 32 of each side molding
crete leakage.
member at suitable intervals throughout the length of
Another object of the invention is to provide improved
the mold section 12. Welded to the outer edge of the
concrete forming apparatus which permits unobstructed
wall 32 and to the outer ends of the reinforcing plates 34
ñnishing of the top surface of a beam being formed 40 is a stiñïening plate 36 (FIGS. 1, 3 and 4), which extends
therein.
the full length of the molding member 14. At each end
Another object of the invention is to provide improved
of the plate 36 (FIGS. 3 and 4) is welded an inverted
apparatus for molding a plurality of concrete beams.
U-shaped bracket 38 whereby one of the mentioned toggled
These and other objects and advantages of the inven
supports 16 is connected to the side member 14. Each
tion will be apparent from the following description taken
bracket 38 is drilled to accommodate a pivot pin 4t). The
in connection with the drawings, in which:
toggled support 16 includes a support strut 42 whose upper
FIG. 1 is a perspective of one section of the molding
end tits within the sides of the associated U-shaped bracket
apparatus Viewed from one end thereof and illustrates
38 and is pivoted on the associated pin 40. The lower
a finished concrete T-beam therein.
end `of the support strut 42 is connected to `a transversely
FIG. 2 is .a plan of the mold section of FIG. 1, drawn 50 extending channel bar 46 by a toggle-joint or knuckle 44
to a reduced scale.
the details of which will be described later herein. One
FIG. 3 is a side elevation of the mold section of FIG. 2.
of the channel bars `46 is located under each end of the
FIG. 4 is an enlarged end elevation of the mold section
side molding member 14, and an intermediate channel bar
of FIGS. 2 and 3.
43 is disposed midway between the two end channel bars
FIGS. 5 and 6 are side elevations on an enlarged scale 55 `46. All of the channel bars rest upon the casting bed 8.
of a toggle device for a mold side member support.
Two slots 5t) are cut in each of the channel bars 46 and
lFIG. 7 is a plan on a reduced scale illustrating the
48. A guide bolt 52 extends through each slot Si) into
molding apparatus of the invention adapted for simultane
the casting bed '8. The guide bolts are threaded and
ous production of a number of concrete T-beams.
engage threaded nuts or other threaded devices (not
A horizontal concrete casting bed 8 (FIGS. 1 and 7) 60 shown) embedded in the concrete of the casting bed 8.
supports the molding apparatus 16 of the invention and
A pair of opposed angle members 54 (FIGS. 1 and 4)
the beam or beams being cast therein. As clearly shown
are welded to each channel bar 46, 48 adjacent the inner
in FIG. 7 the molding apparatus comprises a plurality of
end thereof. The upstanding legs of the angle members
sections 12 disposed in end-to-end arrangement. Each
54 of each pair are separated to loosely receive a vertical
65
section 12 includes a pair of side forming members 14
plate 56 between them. A support bolt 58 extends
(FIGS. 1-4) which tilt into and out of molding posi-V
tion under the control of toggled supports 16 (FIGS. l
and 3-6). The bottom of the mold is closed by a mem
ber 18 (FIGS. 1, 2 and 4) which serves as a pallet for
through the upstanding legs of the angle members 54 of
each pair and loosely through the associated vertical plate
56. A horizontally projecting plate ‘69, integral with the
vertical plate 56, is welded to the underside of a stiifen
the iinished beam. The member 18 is positioned between 70 ing plate 62 which extends the full length of the side mold
the side forming members 14 and is tightly engaged there
ing member 14 and is welded to the lower extremity of
by when they are tilted into molding position. The ends
the vertical wall 28 and to the several triangular rein
3,092,886
4
cept attachment of end plates 19 is required before con
crete can be poured into the forming cavity 23.
The present apparatus is adjustable for the production
of beams meeting a wide range of design requirements.
forcing plates 34. Since each of the vertical plates 56
rests upon the associated support bolt 5S, the side molding
member 14 is therefore pivotally supported on the cast
ing bed 8 by the three bolts 5S.
‘ VSeparation of the sideV molding members 14 of each
The thickness of the web 90 of the T-beam to be cast is
determined by the width of a horizontal board 93 forming
section 12 is adjusted by sliding the supporting channel
the top of the pallet 18, since the vertical walls ‘28 of the
bars y46 and 4S past the guide bolts 52.
Each mold section 12 is opened by tilting back the two
side forming members 14 thereof. This releases the
two side molding members 14 press tightly against the
lateral edges of the board 93.. Selection of a board'93
walls 2S, 3% and 32 from the undersides of a beam 22 10 whose width corresponds to the desired web thickness and
corresponding adjustment of the side molding members 14
and thus releases the beam for ready removal. Operation
on bolts 52 are all that is necessaryl to adjust the mold
of the toggle-joints 44 of the four toggled supports 16 of
section 12 for a selected web thickness.
the mold section 12 causes each of the toggled supports 16
The depth of the web is determined by the height of
in FIG.' 4, or alternatively, an outwardly tilted position 15 the board 93 above the casting bed 8. « This height is ad
justed by changing the timber 94 which support the board
as shown in broken lines in PEG. 4. In the full-line posi
93 above the casting bed 8.
j
tion of the toggled supports 16, the side members 14 are
The width of the slab 92 of the T-beam to be cast is
erect and tightly engage the lateral edges of the pallet 18.
controlled by two laterally adjustable guide members 100
In the broken-line tilted position of the toggled supports,
the side members 14 are tilted apart, pivoting slightly on 20 (FIGS. 1, 2 and 4) which rest on the horizontal walls 32
and extend the full length of the side molding members
the support bolts 5S to the extent permitted by the sup
14. Each guide member 10i) is constructed of a channel
port struts 42. In their outwardly-tilted positions-no por
102 having transverse slots 104 therein. Slots 106 cut
tion of the side forming members 14 contacts the hardened
in the wall 32 are aligned with corresponding slots 164
beam 22.
Each toggle-joint 44 (FIGS. 4-6) comprises a pairy of 25 and a bolt 108 in each aligned pair of slots 194 and 106
permits the guide member to be slid in and out on the
parallel short links `66 which are pivotally connected to
respective horizontal wall 32. The channel 102 is
the lower end of the associated support strut 42 by a pivot
fastened to the wall 32 in selected position of lateral ad
pin 63. II'he links 66 are also pivotally connected to the
justment by tightening the bolts 108. A facing mem
associated channel bar 46 by a pivot pin 70. A U-shaped
bracket ’72 is welded to the upper ends of the links 66 30 ber 110, welded to each channel, bevels the lower edge
of the slab 92 of `the T-beam.
above the pivot pin 63.
The slab thickness of the beam to be cast is‘determinedV
A short rod 74 is welded to the U-shaped bracket 72
by ¿screeding strips 116», one of which is mounted upon
and provides a convenient handle for operating the toggle
each vof the channels 162 with the inner face of the strip
joint. The toggle-joint 44 has two stable positions-the
erect position (PEG. 5) and the tilted position (FIG. 6). 35 116 in alignment ywith the inner face of the associated
facing member 11G, as best shown in FIG. 4. Between
In the open position of the mold section 12 the links 66
each screeding strip I116 and the associated channel 162
and the rod 74 of each toggled support 16 have been
is a spacing yblock 112, #and consequently all that isl
tilted outward to the extent permitted by the lower end
face 76 of the associated support strut 42 abutting against
neessary to prepare the mold sections, as far as web
the upper face 78 of the respective channel bar 46. In 4.0 thickness is concerned, is to select spacing blocks 112 of
such a thickness that they support their respective screed
said open position the weight of the side molding mem
ing strips 116 with the-upper faces of the latter at the
bers 14 is directly transmitted to the casting lbed 8 through
vertical distance above the upper faces of the horizontal
the abutting faces 76 and 78 of lthe several toggled sup
wall 32 which corresponds to the desired'thickness of
ports 16. To move the side forming members 14 to
to assume either an erect position, as shown in full lines
erect position, the handles 74 are swung inward to the 45 the Islab edge. Bolts 114 extending through the screeding‘
position shown in FIG. 5. The pivot pins 68 in this
strips 116, spacing blocks 112 and channels 102 rigidly
retain these parts in their desired relationship. The bolts
manner move past the position of vertical alignment with
114 are shown extended through and above the screeding
the pins 7@ and the toggle-joint can be said to “snap
over-center.” Such movement of the toggle-joint there
strip 116 to receive nuts 117. However, the t-op sur-faces
fore continues slightly past the position of vertical align 50 :of the |screeding ¿strips 116 could be left'unencumbered,
thus to facilitate the operations vof leveling `and finishing
ment of the pivot pins and is limited by the inner face Sil
the upper surfaces of freshly poured beams, by Welding
of the support strut 42 striking a stop member 82 bolted
or otherwise secured to the associated channel bar 46.
«the head-s of the bolts 114 to the undcrsurfaces of the
respective screeding strip 116 so that the shanks of the
When the toggle-joints 44 of a side molding member 14
are snapped-over-center to place the member 14 in its 55 bolts would extend therefrom downward through there
spective spacing .block 112 and channel y162 to receive
erect position the toggle joints are so securely locked in
nuts that could be tightened upward against the under
their inner positions that they will not accidentally tilt
outward. The weight of the concrete and the weight of
the member itself urge the strut faces 8l) into tight con
Y tact with the stop members S2 and thus aid in maintain
ing the mold section in its closed or erect position.
The pivotal axis of each side molding member 14 is
located a substantial distance below the plane of the beam
supporting pallet. Therefore, when the mold is closed, a
surfaces of the webs of the channels 102.
The length of the T-zbeam is the other dimension re
60
quiring adjustment `and this is provided for by connecting
a plurality of sections 12 of the apparatus together. Holes
1211 (FIG. 4) are drilled at appropriate points in the «two
triangular reinforcing plates 34 at the ends'rof each sec
tion 12. This permits two adjacent sections to be joined
considerable force is exerted against the edges of the 65 by bolts placed through the aligned holes 120. In this
fashion an elongate molding cavity could be provided
pallet 118 by the tilted together walls 2S of the side mold
having -a length only slightly less than the length of the
ing members 14. A tightly sealed joint is Ithus estab
casting bed 8.
'
`
lished between the Walls 23 and the pallet 1S to prevent
concrete leakage.
FIGUR-E 7 illustrates -four sections 12 bolted together
It will be noted that the side molding members 14 can 70 in the manner ydescribed and connected to the casting
bed i8 ‘by the guide bolts 52 (FIG. l). The elongate
easily and quickly be tilted together or -tilted apart manu
molding cavi-ty thus created lis partitioned into individual
ally, by use of a simple tool such as a pipe 84 (FIG. 6)
which ñts over the handle 74 as an extension thereof.
beam molding cavities :by locating headers 132, 133, i134
Little time or effort is required to use the apparatus be
and 135 selected distances `apart in the elongate cavity.
cause after tilting the members 14 together, nothing ex 75 The headers are fabricated of plywood or other material
3,092,886
5
6
and are cut to conform to the cross sectional shape of
sections 14 swing outward.
the molding cavity. The headers therefore engage and
seal against the tilted together side molding members 14
just `as the pallet liner seals against the members 14.
The headers also contain appropriate holes for receiving
apparatus so that the individual beams can readily be
removed by a crane or otherwise. Suitable lifting hooks
148 (FIG. 7) can be cast in the beams for this purpose.
The toggle-joints 44 can be opened at any time after
the concrete hardens; this is a matter of choice because
This opens the molding
beam stressing members such as the steel cables 20 which
are connected to a tensioning machine 124 (FIG. 7) at
the beam is supported above the casting bed 8 when the
one end of the elongate cavity 23 and to a suitable an
side molding members 14 are tilted»apart by the timber 94
chor 126 at the other end of the cavity. inasmuch as
and the board 93 of the pallet 18 (FIGS. l and 4).
the details of construction and manner of `operation of 10
While one form of apparatus for carrying out the
the tensioning machine 124 and of the anchor 126 do
present invention has been described, it should be noted
not form part of the present invention, they need not be
that various modiñca-tions may be made without depart
described in detail herein. A possible pattern for laying
ing from the spirit of the invention as defined by the ap
the cables 26 is shown by the end of the beam 22 illus
pended claims.
trated in FIG. l. The cables 20 are threaded through 15
The invention having thus been described, what is be
appropriate holes in the hereinabove mentioned end
lieved to be new and desired to be protected by Letters
plates 19, one of which is attached to each end of the
Patent is:
`apparatus and through the holes in the headers .132, 133,
1. For use in molding apparatus for a concrete beam
134 and 135. On the other hand, the cables 20 can be
having a horizontal ñat slab section and a vertical web sec
threaded .through the end plates and the headers as a 20 tion, an article of manufacture comprising a pivotally
preliminary step. This permits the end plates and headers
mounted molding member having a first forming surface
to be inserted into the mold cavity with the cables
for forming a side of said web section and a second form
threaded therethrough, after which the cables can be at
ing surface extending laterally from said first forming
tached to the tensioning apparatus land the cable anchor.
surface for forming an adjacent underside of said slab
With some cable patterns the headers and end plates may 25 section, means on said second forming surface to receive a
be provided with slots rather than holes for receiving the
forming member for the lateral side of said slab» section,
cables.
a rigid strut pivotally connected at one of its ends to said
A pair of the headers spaced a short distance apart
molding member beneath said slab forming surface, a
are placed in the elongate molding cavity to define the
link having a pivotal connection at one of its ends with
limits of the adjacent individual beam molding cavities. 30 the other end of said strut to form a movable toggle joint.
Each pair of adjacent headers (132 and 133) is termed
support means, means securing the other end of said link
a header member 140 (FIG. 7). The separation of
to said support means so that said strut and said link are
headers 132 and 133 `of a header member is approximate
movable into and out of coaxial alignment, means pivotal
ly one foot and the separation of headers 133 and 134
ly mounting the molding member on said support means
determines the length of the beam 22a. The separation 35 for movement of said first forming surface, means mount
of the header 132 »and the end plate 19 determines the
ed on said support means in spaced relation to said other
length of the beam 22h.
end of said link for limiting the movement of said toggle
The headers of a header member 140 must be supported
joint in one direction at a position whereby said strut
against the pressure exerted `by the fluid concrete placed
and said link are out of coaxial alignment to cause the
in the individual beam molding cavity. Such support 40 weight of concrete on said slab forming surface to lock
can be provided by attaching a clamp 142 to each of
said strut and link in place, and means for moving said
the several steel cables 20 where the cables emerge from
toggle joint in a second direction to cause said molding
the headers. Spacers of Wood or other material could
member to pivot and be released from a concrete beam
lalso be used to support the headers of a header member
formed thereon.
against the concrete pressure. C-‘clamps or other de 45
2. For use in molding >apparatus for a concrete T
vices may be used on top of the headers to hold the
beam having a horizontal fiat slab section and a vertical
headers down in the cavity but this is usually not neces
web section, an article of manu-facture comprising a mold
sary. Sealing of the holes Where the cables pass through
ing member having a first forming surface for forming
the headers can be yachieved by devices such as common
a side of said web section yand a second forming surface
O-rings, but this »too is usually not necessary.
50 extending laterally from said first forming surface for
After the header members 140 are installed and the
forming an adjacent underside of said slab section, means
end plates 19 attached, the cables are ystressed to the de
on said second forming surface to receive a forming mem
sired degree by the tensioning machine 124. Concrete
ber for the lateral side of said slab section, a rigid strut
is then poured into the individual molding cavities and
pivotally connected at one of its ends to said molding
if necessary subjected to mechanical vibration to eliminate 55 member beneath said slab forming surface, a link having
voids. No concrete has been poured in the right-hand
a pivotal connection with the other end of said strut to
beam cavity Z3 of FIG. 7 and the cables 2U are exposed
form a toggle joint, support means for pivotally mount
therein. After vibration suitable screeding and finishing
operations are performed lat the top surface of »the beam.
ing said link and the web forming portion of said molding
present apparatus, there are therefore, no bracing bars
or other members extending across the top of the form
to interfere with the linishing of the beam. When a
suiîicierit time has elapsed to permit the concrete to at
said web forming surface to cause said strut and said link
to move into and out of coaxial alignment, stop means
mounted on said support means in spaced relation to said
member at spaced locations on said support means Where
It is to be noted that no cross-ties are necessary with the 60 by said toggle joint is movable toward and away from
other end of said link for limiting movement of said toggle
tain suflicient strength the tensioning machine is released. 65 joint toward said web forming surface at a position where
This relaxes the short pieces of cable connecting the
by said strut and said link are slightly out of coaxial align~
adjacent beams. The spacers or clamps 142 are then re
ment to cause the weight of concrete on said slab forming
moved and the two headers of each header member 140
surface to lock said strut and link in place, and means for
are moved away from the vertical end faces of the beams.
moving said toggle joint away from said web forming
The end plates 19 are also removed. This exposes the 70 surface to cause said molding member to pivot and be re
cables at the points where they emerge from the con
leased from a concrete T-beam formed thereon.
crete and permits the cables to be `cut off flush with the
3. In molding apparatus for a concrete T-beam having
end faces of the beams. Suitable lengths of cable could
a horizontal ñat slab section and a vertical web section,
be left projecting yfrom the beam ends if it is desired.
said apparatus including means for forming the ends of the
The toggle-joints 44 `are then released and the mold 75 beam and means for for-ming the sides of said slab sec
3,092,886
8
7
tion; the combination comprising a web» bottom forming
member, a pair of opposed spaced molding members with
said web bottom forming member therebetween and having
forming surfaces for forming the sides of said web and
the adjacent undersides of said slab, a pair of rigid struts
ends of each molding member and extending across the
space between the walls of each molding member that
extend in a vertical plane for molding each of the axial
ends of said T-beam, horizontally extending means bridg
. ing the space between the lower portions of such verti
each being pivotally connected at one of its ends to one of
said molding members beneath the associated slab form
ing surface, a pair of links each having a pivotal connec
tion at one of its ends with one of said struts at the other
end thereof to form a toggle joint, means anchoring the
other ends of each of said links to support means so that
each of said toggle joints are movable toward and away
from said web bottom forming member to move the as
sociated link and strut into and out of coaxial alignment,
means for pivotally mounting said web side forming por
tions of said molding members on said support means and
below the forming surface of said web- bottom forming
member, means mounted on sa-_id support means in spaced
relation to said other endsrof said links for limiting move
ment of each said toggle joint in one direction at a posi
tion whereby its strut and link are out of coaxial align
ment to cause the weight of concrete on the associated
slab forming sur-face to lock said strut and link in place,
and means for moving each toggle joint in the opposite
direction to cause the associated mold-ing member to re
cally extending walls for molding the bottom of said web
section, a strut operatively connected at one end to each
of said slab molding walls, means mov-ably securing the
other ends of each of said struts to support means, said
last-named »means comprising movable toggle joints so
that said struts may be moved into two positions, means
for pivotally mounting said first and second molding
members on said support means, means on said support
means spaced from said toggle joints for limiting move
ment of said toggle joints in one direction to cause the
weight of the concrete in said slab section to assist in re
taining the mold members in operating arrangement, and
means for moving the «toggle joints in the opposite direc
tion to pivot `said molding members apart to free the
molded concrete T-beam.
`6. Apparatus Áfor molding a concrete T-beam having a
horizontal ilat slab section and a vertical web section com
prising a first molding member and a second molding mem
fber, each molding member having -a wall for lmolding a
respective side of said web section, the wall of one
molding member extending in a vertical plane parallel to
the plane in which the wall of the other molding member
extends, each molding member having a wall for molding
a horizontal ilat slab section and a vertical web section,
said apparatus including means for forming the ends of
the adjacent underside `of said slab section including
said beam and means for forming the side portions of said 30 means `for molding the associated lateral edge of the slab,
slab portions of said slab section and a web bottom form
vertically extending means atlixed to the transverse ends
ing member; the` improvement comprising a pair of op
of each molding member and extending across the space
posed spaced molding members with said web bottom
between the Walls of each molding member that extend
forming member therebetween and having forming sur
in a vertical plane for molding each axial end of said
faces for forming the sides of said web section and the
Tebeam, means in juxtaposition to and between said
adjacent undersides of said slab section, a pair of rigid
molding members for molding the bottom of said web
struts each being pivotally connected at one of its ends
section, a strut operatively connected -at one end to each
to one of said molding members beneath the associated
of said slab molding walls, means movably anchoring
slab forming surfaces, a pair of links each having a pivotal
the other ends of each of said struts to support means,
connection with one of said’struts at the other end there 40 said last-named means including movable toggle joints so
of to form a toggle joint, each toggle joint being movable
that said struts ‘may be moved into two positions, said
toward and away from said web bottom forming member
support means pivotally mounting said molding mem
Yto move the associated link and strut into and out of co
bers below the Iforming surface of said web bottom form
axial alignment, support means pivotally mounting said
ing means, means mounted on said support means and
molding members and said links in spaced apart relation 45 spaced from said toggle joints for limiting movement of
Vship and at an Velevation below the forming surface of
each of said toggle joints toward said web in `a position
said web bottom forming member, stop means mounted
wherein the associated strut is positioned so as to cause
on said support> means in spaced-relation to said other.
t-he weight of the concretein said slab section to assist
end of said links, means for limiting movement of each
in retaining the molding members in operating arrange
of said toggle joints toward said web bottom forming mem 50 ment and in tight engagement with said web -bottom ‘form
ber at a position where-in the associated strut and link are
ing means, -and means for moving the toggle joints away
slightly out of coaxial alignment to cause the weight of
from said web to pivot said molding members apart and
lease the concrete T-beam formed thereby.
4. In molding apparatus for a concrete T-beam having
concrete on the associated slab forming surface to lock
said strut and link in place and rigid means connected to
said link-s and extending in a direction away from said
support means for moving the toggle joints away from said
web bottom forming member to cause said molding mem
ber to pivot apart and release the concrete T-‘beam formed
free the molded concrete Tebeams.
References Cited in the file of this patent
UNITED STATES PATENTS
266,602
Blum ________________ __ Oct. 13, 1882
757,094
Coltrin ______________ __ Apr. 12, 1904
5. Apparatus `for molding a concrete T-beam having a 60
2,489,604
2,489,607
2,582,161
Woods ______________ __ Nov. 29, 1949
Alexander __________ __ Nov. 29, 1949
Randall ______________ __ Jan. 8, 1952
Iber, each molding member having a wall for Amolding a
respective side of said web section, the -Wall of one
molding member extending in a vertical plane parallel to
the plane in which the wall of the other molding member
extends, each molding member having a wall for molding
the adjacent underside of said slab section, said last
named wall including means for molding the associated
lateral edge of the slab, means alîixed to the transverse 70
2,596,052
Stockmar ____________ __ May 6, 1952
2,648,889
Youtz ______________ __Aug. 18, 1953V
115,747
Austria ______________ __ June 10, 1930
561,135
700,947
1,173,303
Great Britain __________ __ May 5, 1944
Great Britain ________ __ Dec. 16, 1953
France ______________ __ Oct. 27, 1958
therebetween.
horizontal ñat slab section and a vertical web section corn
prising a iirst molding member and a second molding mem
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