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Патент USA US2112868

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April 5, 1938.
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_,|_ w‘ swANK
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2,112,868
ADJUSTABLE CLAMPING MEANS FOR CONCRETE FORMS
Filed May 11, v1956
2 Sheds-Sheet l
April 5, 1938.
,
J. w. SWANK
,
2,112,868
ADJUSTABLE CLAMPING MEANS FOR CONCRETE FORMS
Filed May 11, 1936
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Patented Apr. 5, 1938
2,112,868 '
UNITED STATES
PATENT
OFFIQE -
2,112,868
ADJUSTABLE OLAlVlPING MEANS FOR CON
CRETE FORMS
James W. Swank, Chicago, IlL, assignor of one
half to Raymond M. Calkins, Deer-?eld, Ill.
Application May 11, 1936, Serial No. 78,979
10 Claims.
My invention relates to adjustable clamping
means for concrete forms and particularly for
forms designed for use in connection with the
operation of pouring concrete about an upright
5 beam constituting the structural steel portion
of a column. It is usual practice in this type of
work to complete as a unit the portion of the
column between ?oors of a building, with all of
the concrete for such unit poured from about the
w level of the upper ?oor. Under such circum
stances, it is not unusual to pour concrete from
a height of twenty or thirty feet above the point
where the concrete is deposited, and it will be
appreciated that the form must, therefore, be
iii. very strong and very strongly reenforced to
ceive the concrete and hold it to the desired
and shape to conform to the ?ttings which
to be used on the column and to conform to
re
size
are
the
position of the partitions or other building ele
2O ments with which the column must have a de?
nite predetermined relation.
It is the object of my invention to provide an
improved form and arrangement of parts con
stituting the clamping means by which the form
25 panels are held in position and prevented from
bulging outwardly under the heavy pressure to
which they are subjected, by the use of which
such clamping means can be quickly and easily
applied in operative clamping position, by which
30 the desired close ?t can be provided between the
clamping means and the form panels correspond
ing to the precise size of column to be built, and
by reason of which an operator is able easily to
remove the clamping means and the form after
35 the concrete has set and dried.
It is one of the objects of my invention to
provide an improved arrangement of rack bars
and p-inions for applying power to the rack bars
for moving them to their clamping position, to»
40 gether with an improved arrangement of hold
ing and operating pawls or latches by which
power may be applied to both of the rack bars
or to either of them separately for effecting the
desired tightening of the bars on the form.
45
It is another object of my invention to im
prove devices of this type in sundry details here
inafter pointed out. The preferred means by
which I have accomplished my several objects
are illustrated in the drawings and are herein
50 after speci?cally described. That which I believe
to be new and desire to cover by Letters Patent
is set forth in the claims.
In the drawings,-—
Fig. 1 is a horizontal sectional view through a
55 column and the formpanels within which the
(Cl. 144—291)
concrete of the column has been poured, showing
a set of my improved adjustable clamping means
in position thereon;
Fig. 2 is an enlarged detail view, being'a sec
tion taken at line 2—2 of Fig. 1 upon an enlarged 5
scale;
Fig. 3 is an edge View of one of the clamping
frames of my device, being substantially a ver
tical section taken on an enlarged scale at line
3—3 of Fig. 1;
10
Fig. 4 is a vertical sectional view through said
clamping frame arrangement taken also on an
enlarged scale at line 4—4 of Fig. 1;
Fig. 5 is a horizontal sectional view taken
through my improvedi clamping frame, being 15
partly broken away for clearness of illustration;
and
Fig. 6 is a view similar to a portion of the
parts shown in Fig. 5 but illustrating a changed
position of certain of the parts.
20
Referring now to the several ?gures of the
drawings, in which corresponding parts are indi
cated by the same reference characters, l0 indi
cates a structural steel part in the form of an
I-beam in vertical position in the frame-work 2
of a building. Form panels ll, l2, l3 and M are
shown in position forming a housing about the
beam in and held in position by the means here
inafter described during the pouring of the con
crete l5 about the beam 19, as is readily under- 30
stood by those skilled in the art.
My improved clamping means for holding the
form panels in position comprises a pair of rack
bars l6 and il pivotally connected together at
their adjacent ends by means of a bolt 58 and 35
comprises further a second pair of rack bars l9
and 2E! pivotally connected together at their ends
by means of a bolt 2!.
Each of the bolts i8 and
2| is of the type illustrated in Fig. 2 comprising
head portions 22 and 23 at opposite ends and cir- 40
cular bar engaging portions 24 and 25 which are
positioned eccentrically with respect to each
other. In the arrangement shown washers 26
are interposed between the parts, being held in
snug frictional engagement with the bars I6 and 45
l’! and the head portions 22 and 23 so as to enable
the bolt to have a strong gripping relationship
to the engaged parts. By reason of this arrange
ment, the bolts are cap-able of being rotated by
the application of a reasonable force thereto by 50
means of a wrench applied upon the angular head
portions 22, while at the same time the bolts are
adapted to hold the bars I6 and I1 very strongly
in adjusted position.
As is clearly shown in Fig. 1, the bars l6 and 55
2,112,868
2
I‘! of one pair are in crossed relationship to the
bars l9 and 20 of. the other pair respectively so
as to provide for the application of frame mem
bers to the bars at their crossing points for apply
ing power to the bars for tightening the series of
bars as may be desired about the form panels.
A frame member 21 is shown engaging the bars
l6 and I9 at their crossing point, and a second
frame member 28 is shown engaging the rack
10 bars l1 and 29 at their crossing point. As is
best shown in Fig. 3, each of the frame members
21 and 28 is in the form of a housing within
which the rack bars. are slidably mounted, the
arrangement being such that the rack bars are
15 normally slidable freely through the frame mem
bers longitudinally of the bars, the smooth edges
of the bars being in sliding engagement with
bearing portions of the frame members positioned
at right angles with respect to each other._
As is clearly shown in Figs. 4 and 5, each of
20
the frame members 21 and 28 is provided with
a shaft 29 in substantially central position there
in having two pinions 30 and 3| revolu‘bly
mounted thereon in position to engage the teeth
25 of the rack bars so as to hold said bars strongly
in position at right angles to each other. Each
of said shafts has a lever 32 pivotally mounted
thereon between the pinions so as to swing freely
about the shaft within the housing. The lever
32 is provided at one face with an operating
pawl 33 in position to engage the pinion 30 and
is provided at its opposite face with a pawl 34
in position to engage the pinion 3|, such pawls
in the arrangement shown being pivotally mount
ed upon a bolt 35 of any approved form. Each
of the pawls 33 and 34 is held yieldingly by a
spring 36 in engagement with the adjacent pin
ion, such springs 36 in the arrangement shown
being mounted upon the lever 32 by means of a
bolt 31. The arrangement is such that upon
swinging movement of the lever 32 in opposite
directions about the shaft 29 the pinions 39 and
3| are given rotary movement for changing the
longitudinal adjustment of the rack bars, the
45 pinion 30 being driven by the pawl 33 in clock
wise direction in Fig. 5, while the pinion 3|. is
:driven in counter-clockwise direction by the .
pawl 34.
For holding the pinions 30 and 3| against ro
tation in the opposite direction, I have provided
pawls or latches 38 and 39 in position to engage
the respective pinions. The pawl or latch 38 is
pivotally‘ mounted upon the frame member by
means of a bolt 48 and is normally held in opera
55 tive engagement with the pinion 30 through the
medium of a flat spring 4| mounted upon the
frame member. The pawl or latch 39 in turn
is pivotally mounted upon the frame member by
means of a bolt 42 in position to engage the
60 pinion 3|, being held normally in engagement
with said pinion by a ?at spring 43 mounted
on the frame member.
The means for operating the lever 32 in my
,"improved arrangement comprises a handle mem
65 ber 44 which is provided with a socket 45 in one
end adapted to be slid readily over the outer end
of the lever 32 into effective engagement there
with as is shown in Fig. 5. As is also shown in
said ?gure, the pawls 33 and 34 are provided
with lugs 46 and 41 respectively which project
70
slightly beyond the edge faces of the lever 32.
The length of the socket 45 is greater at one
edge face than at the opposite edge face and
the handle member 44 is' arranged so as to be
75 reversible through an angle of 180° upon the
lever 32 so as to bring the longer edge face
of the socket into position opposite either of the
lugs 46-41 as may be desired. The arrange
ment is such that when the handle 45 is in the
position as shown in Fig. 5, the lever 32 may be a
manipulated through the medium of the handle
44 for causing rotation of the pinions 30 and 3|
successively in opposite directions upon swing
ing movement of the lever.‘ The arrangement
further is such that when the handle member
44 is pressed inwardly toward the shaft or axle
29 the longer face portion of the socket 45 by
engagement with the lug 46 or 41 forces the
corresponding pawl 33 or 34 out of engagement
with its pinion. As will be readily understood,
when the handle 44 is held pressed inwardly as
shown in Fig. 6, upon swinging movement of the
handle the pinion 3| is given a rotary movement
upon each stroke of the handle toward the right
in said figure. The pinion 30, however, is per 20
mitted to remain in unchanged position during
the swinging movement of the handle so long as
the pawl 33 is held out of operative position. If
it were desired to throw the pawl 34 out of oper
ation rather than the pawl 33, this would be ac
25
complished by pressing the handle 44 inwardly
toward the axle 29 in the position as shown in
Fig. 5 rather than in the reverse position as
shown in Fig. 6.
'
As is clearly shown in said Fig. 6, when the 30
handle 44 is pressed inwardly to the limit of its
motion toward the axle 29 so as to throw the
pawl 33 out of engagement with the pinion 38,
and when in such position the handle 44 and
lever 32 are moved to the limit of their motion to 35
ward the left in said Fig. 6, the pawl 33 is brought
into engagement with the latch or pawl 38 for
releasing said latch from the pinion 30. If the
handle 44 were reversed from the position shown
in Fig. 6 and were forced inwardly for throwing
the pawl 34 out of engagement with the pinion
3|, and the handle 44 and lever 32 were then
swung to the limit of their motion toward the
right in Figs. 5 and 6, the pawl 34 would then by
engagement with the latch or pawl 39 throw such 45
latch out of engagement with the pinion 3|.v
When it is desired to secure a form in position
about a beam by the use of my improved clamp
ing means, the rack bars are placed in position
about ‘the form and their end portions are slid
into position within the frame members 21 and
28. The bars are then tightened in position by'a
swinging movement of the handle and the lever
32., If it is desired to rotate only one of the pin
ions 30--3|, this can be readily accomplished
through the medium of the handle 44 in the. '
proper position as shown in either Fig. 5 or Fig.
6. If ‘it appears at about the end of the tighten-y
ing operation that the bars cannot be tightened
completely through the medium of a tooth by Ct)
tooth adjustment, then the handle 44 is removed
from the lever 32 and is applied to the proper
one of the bolts |.8 or 2| and such bolt is given
the required rotary movement for giving the
?nal adjustment between the rack bars for in (i5
suring the ?rm clamping of the bars about the
form. With the pressure being applied to the
bars I6 and H in different directions at right
angles to each other, the bolts I8 and 2| are
enabled to hold the bars in adjusted position 70
against a very heavy pressure, the bolts being
held themselves solely by their frictional en
gagement with the cooperating parts.
When it is desired to remove the form after
the hardening of they cement, the bolts l8 and
2,112,868
2| are preferably turned for loosening the bars
initially, and the handle 44 is then applied in
position as shown in Fig. 6 for releasing the latch
38 or is applied in reversed position as above de
scribed for releasing the latch or pawl 39.
In Fig. 5, the handle 44 is shown as being pro~
vided with a notch 48 in its outer end for ap
plication to one of the bolts I8—2| for manipula
tion thereof.
10
By the use of my improved clamping means, I
:1
am enabled very quickly and easily to apply heavy
pressure to a form and to tighten the form as may
be desired for the placing of the concrete. When
the concrete has hardened, the latches 38 ‘and
15 39 can be very quickly and easily thrown out of
holding position, and if there is any difficulty with
respect to releasing the latches 38 and 39 the dif?
culty can be very readily overcome by a prelimi-'
nary loosening of the series of rack bars by a
20 rotary movement of one or both of the bolts
l8—2l.
While I prefer to employ the form of appara
tus as show in my drawings and as above de
scribed, it is to be understood that my invention
25 is not limited thereto except so far as the claims
may be so limited by the prior art.
I claim:
1. In a clamping means for concrete forms, the
combination of a series of connected bars adapted
30 to be applied upon a column form and compris
ing two rack bars in crossed relationship, a frame
said bars about the form, pawls adapted by en-'
gagement with said pinions to hold said bars'in
tightened condition, and means connected with
said lever and operable thereby for releasing‘said
pawls for permitting loosening movement of said;
bars.
4. In a clamping means for concrete forms, the
combination of a series of connected bars adapted
to be applied about a column form and comprise‘
ing two rack bars in crossed relationship, a frame‘
member having sliding engagement with said
rack bars, pinions on said frame member mesh
ing with said rack bars respectively, a'lever and
cooperating devices adapted by a stroke of ‘the
lever in one direction to rotate one of said pinions _
for moving the engaged rack bar in the direction‘
for tightening said bars about the form and
adapted by a stroke in the other direction to
rotate the other of said pinions for moving the
engaged rack bar in the direction for tightening 20"
said bars about the form, pawls adapted by en
gagement with said pinions to hold said bars‘ in
tightened condition, and means connected with
said lever and operable thereby for releasing
either of said pawls alternatively for permitting
loosening movement of the corresponding rack
bar.
‘
i
5. In a clamping means for concrete forms, the
combination of a series of connected bars adapted
to be applied about a column form and compris do"
ing two rack bars in cross relationship, a frame"
member having sliding engagement with said rack
bars, pinions mounted concentrically on said
member having sliding engagement with said
frame member in mesh with said rack bars re
35 spectively and free to rotate independently of
with said rack bars respectively, a lever pivotally
each other, a lever adapted to swing about the
axes of said pinions, pawls on said lever engag
ing said pinions respectively and each adapted
upon a stroke of the lever in one direction to
40 rotate the pinion in engagement therewith, and
other pawls carried by said frame member and
engaging said pinions respectively for holding the
pinions normally against rotation in the direction
for loosening the bars about the form.
2. In a clamping means for concrete forms,
the combination of a series of connected bars
adapted to be applied about a column form and
comprising two rack bars in crossed relationship,
a. frame member having sliding engagement with
said rack bars, pinions on said frame member
meshing with said rack bars respectively, a lever
and cooperating devices adapted by a stroke of
the lever in one direction to rotate one of said
pinions for moving the engaged rack bar in the
221 U! direction for tightening said bars about the form
and adapted by a stroke in the other direction to
rotate the other of said pinions for moving the
engaged rack bar in the direction for tightening
said bars about the form, and pawls adapted by
60 engagement with said pinions to hold said bars in
tightened condition.
3. In a clamping means for concrete forms, the
combination of a series of connected bars adapted
to be‘ applied about a column form and compris
- ing two rack bars in crossed relationship, a frame
member having sliding engagement with said
rack bars, pinions on said frame member mesh
ing with said rack bars respectively, a lever and
cooperating devices adapted by a stroke of the
lever in one direction to rotate one of said pinions
for moving the engaged rack bar in the direction
for tightening said bars about the form and
adapted by a stroke in the other direction to ro
tate the other of said pinions for moving the en
75 gaged rack bar in the direction for tightening
rack bars, pinions on said frame member meshing
mounted on the axis on which said pinions are
mounted, pawls pivotally mounted on said lever
and extending in opposite directions therefrom
into engagement with said pinions respectively
adapted upon successive strokes of the lever in
opposite directions to rotate the respective pin~ 40
ions for tightening the bars about the form, re
leasable latches for holding said pinions against
rotary movements in the reverse directions, ‘and
means movably mounted on said lever operable in
one position for moving one of said pawls out'of‘ 45
engagement with its pinion and operable in an-'
other position for moving the other of said pawls
out of engagement with its pinion.
‘ '
- '
6. In a clamping means for concrete form'sythe '
combination of a series of connected bars adapted‘ 50
to be applied about a column form and comprise’
ing two rack bars in crossed relationship; a frame
member having sliding engagement with said
rack bars, pinions on said frame member meshing
with said rack bars respectively, a lever pivotally 55
mounted on the axis on which said pinions are
mounted, pawls pivotally mounted on said lever
and extending in opposite directions therefrom
into engagement with said pinions respectively
adapted upon successive strokes of the lever in 60
opposite directions to rotate the respective pin
ions for tightening the bars about the form, re
leasable latches for holding said pinions against
rotary movements in the reverse directions, and
means movably mounted on said lever operable in 65
one position for moving one of said pawls out of
engagement with its pinion and adapted in said
position at the end of a stroke of the lever in one
direction to release the latch from- said pinion
and operable in another position for moving the
other of said pawls out of engagement with its 70
pinion and adapted in such position at the end of
a stroke of the lever in one direction to release
the latch from said other pinion.
7. In a clamping means for concrete forms, the
75
4.
2,112,868
combinationof, a series of. connected bars adapted
to;be applied about a column form and compris
ing tworack bars in crossedrelationship, a frame
member: having sliding engagement with said
rack bars, pinions on said frame member mesh
‘ ing with said rack bars respectively, a lever piv
otallyv mounted. on the axis on which said pinions
are mounted, pawls pivotally mounted on said
leverland extending in opposite directions there
frominto engagement with said pinions respec
tively adapted-upon successive strokes of the lever
in opposite directions tov rotate the respective pin
ions for, tightening the bars about the form, re
leasable latches for'holding said pinions against
15 rotary: movements in the reverse directions, and
meanssliclably mounted on said lever and revers
ible-through an angle of 180° thereon operable in
one position for moving one of said pawls out of
engagement with itspinion' and operable in the
20. reverse position for moving the other of said
pawlsout of. engagement with its pinion.
, 8. Ina- clamping means for concrete forms, the
combination of a series ofconnected bars adapted
to be'applied about a column vform and compris
25 ingtwo rack bars in crossed relationship, a frame
member having sliding engagement with said
rack bars, pinions on said frame member mesh
ing-with said rackrbars respectively, a lever piv
otally mounted. on the axis on which said pinions
30 are mounted, pawls pivotally mounted on said
lever and extending in opposite directions there
from into engagement with said pinions respec
tively adapted upon successive strokes of the
leverinopposite directions to rotate the respec
35 tive pinions for tightening the bars about the
form, releasable latches for engaging and holding
said pinions against rotary movements in'the re
into engagement with its respectivelatch to. re
lease said latch from said other pinion.
9. In a clamping means for concrete forms, the»
combination of a series of connected bars adapted
to be applied about a column form and compris
ing two rack bars in crossedrelationship, a frame
member having sliding engagement with said,
rack bars, pinions on said frame member meshing
with said rack bars respectively, a lever pivotally‘
mounted on the axis on which said pinions are
mounted, pawls pivotally mounted on said. lever
and extending in opposite directions therefrom
into engagement with said pinions respectivelyl
adapted upon successive strokes of the lever in
opposite directions to rotate the respective pin 1.3:
ions for tightening the bars about. the form?re-r
leasable latches for holding said pinions against
rotary movements in the reverse directions, and
an operating handle slidably mounted on said,
lever for forming an operative extension thereof
and reversible through an angle of 180° thereon,
said handle being longer at one face than atthe
opposite face and being adapted when pressed
toward the axis of the lever in either of its said
two positions to engage one of said pawls at the
longer face of the handle for throwing suchpawl,
out of operative position while at the sametime
clearing the other pawl so as to leave such other ‘
pawl in operative position.
'
10. In a clamping means for concrete forms,‘
the combination of .four bars pivotally connectedv
together in pairs for application about a column,
form with the bars of each pair in crossed rela
tionship to the bars of the other pair respectively,
each of said bars being provided with a series of
teeth on its outer edge at its free end portion, two
frame members through each of which the
crossed, bars at one corner extend with their
verse directions, the latches being engaged by
their respective pawls for release from said pin
ions, and, an operating handle slidably mounted
40'}
smooth edges engaging bearing portions of the
frame member positioned at right angles toeach
thereof andreversible through anangle of 180°
in concentric position with respect to each other
on said lever for forming an operative extension
thereon operable in one position for moving one
ofv saidrpawls out of engagement with its pinion
._ and adapted insuch position at the end of a
stroke of the lever in one direction to move said
pawl into engagement with its respective latch to
release said latch from said pinion and operable
in thereverse position for moving the other of
_said,pawls out of engagement with its pinion and
' adapted in such position at the end of a stroke of
the lever mane directionto move said other pawl
other, two pinions on each of said frame members
and in mesh with the teeth of the crossed bars
serving to hold the bars in engagement with said
bearing portions so as to prevent the bars from
movement out of operative relation to each other,
and pawl and lever means for rotating said pin
ions in the direction to tighten the bars about .the
form and for holding the pinions against reverse
rotation.
JAMES W. SWANK.
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