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Патент USA US3035331

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May 22, 1962
3,035,152 1
v. E. o. HENNIG
DEMOUNTABLE CONCRETE FORM
Original Filed March 16, 1953
5 Sheets-Sheet 1
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INVENTOR.
May 22, 1962
v. E. o. HENNIG
3,035,321
DEMOUNTABLE CONCRETE FORM
Original Filed March 16, 1955
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May 22, 1962
v. E. o. HENNIG
3,035,321
DEMOUNTABLE CONCRETE FORM
Original Filed March 16, 1953
5 Sheets-Sheet 3
INVENTOR.
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May 22, 1962
v. E. o. HENNIG
3,035,321
DEMOUNTABLE CONCRETE FORM
Original Filed March 16, 1953
5 Sheets-Sheet 4
IN VEN TOR.
V/C’TOE 5 Q A/EA/N/é
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May 22, 1962
v. E. o. HENNIG
3,035,321
DEMOUNTABLE CONCRETE FORM
Original Filed March 16, 1955
5 Sheets-Sheet 5
,4 frog/v.56’
nited States
"re
atnt
3,335,321
Patented May 22, 1962
1
3,035,321
DEMOUNTABLE CONCRETE FORM
The design of the forms in accordance with this in
vention utilizes standard structural members for the most
part for the sake of economy, yet these are combined
in a novel and effective manner to accomplish the ob
Victor E. 0. Hennig, 131 N. 40th, Seattle, Wash.
Original application Mar. 16, 1953, Ser. No. 342,473, now 5
jects recited above. Moreover, the elements may be uti
Patent No. 2,859,503, dated Nov. 11, 1958. Divided
lized in the construction of certain special form shapes
and this application Feb. 27, 1958, Ser. No. 718,060
as well as for the simplest type of concrete walls involv
3 Claims. (Cl. 25-131)
ing walls of uniform thickness extending over a height
The concrete form of the present invention is of the
of one story.
demountable type composed of parts which can be used 10
In the fabrication of forms utilizing the present inven
over again .at least a considerable number of times, and
tion the footing forms may be conventional, being con
some parts of which can be used inde?nitely. This ap
structed of stringers on edge suitably anchored relative
plication is a division of my application Serial No.
to the ground, such as by stakes driven into the ground
342,473, ?led March 16, 1953, now Patent Number
2,859,503.
Conventional concrete forms involve much carpentry,
requiring at least semi-skilled labor. The construction of
the forms is a tedious process and stripping of the forms
from the completed wall requires considerable time.
Where lumber is used in constructing the forms, usually
dimension lumber and shiplap, it is expensive to use again
either for form work or for other purposes because it
and secured together by cleats or battens interconnecting
15 and nailed to their upper edges.
On these cleats and ex
tending lengthwise of the stringers are two alignment
strips disposed in parallel relationship and spaced apart
edgewise a distance equal to the thickness of the wall and
the form panels. Fabricated uprights are stood at pre
determined intervals along such alignment strips and se
cured relative to them. Such uprights are formed of
conventional structural shapes such as a pair of structural
must be cleaned, and the nails pulled from it. Plywood
angles, or of parallel wood pieces. These uprights have
has also been used for forms, which is more convenient
to use again, but the supporting pieces of dimension lum
feet and head assemblies at opposite ends which may be
of a type to fold relative to the upright for storage and
ber still must ‘be reclaimed and nails pulled from the
plywood, limiting the types of purpose for which the
during transportation, and may be secured at various
angle positions relative to the body of the upright for
use in constructing forms for sloping faced walls. More
It is the principal object of the present invention to
over, such uprights are preferably adjustable in length for
provide a type of concrete form work utilizing frame 30 use in constructing forms for walls of different heights.
members of a permanent type for supporting plywood
Panels braced by the uprights, and the uprights them
panels specially prepared for use with such frame mem
selves, may be secured in place by form ties. Walers
lumber can be reused.
bers. These plywood panels can be supported by the
frame members without requiring to be nailed in place,
and consequently they are not damaged by having nails
both for straight wall bracing and for supporting buttress
driven through them, nor is it necessary to spend time
novel form structure shown in the accompanying draw
ings are discussed more fully in the following speci?c
pulling nails from the panels.
In assembling the permanent frame members to sup
port the plywood form panels it is an object to provide
connections between the frame members themselves, be
tween such members and the panels, and between such
forms may be secured readily to such uprights.
I The details of the above-mentioned elements of the
description.
FIGURE 1 is a plan view with parts broken away of
a portion of a footing form with the alignment strips in
place.
members and other parts of the form work as to mini
mize the skill and amount of labor required to assemble
the frame members and panels, and to minimize the con
FIGURE 2 is a plan View of a portion ofya wall form,
parts being broken away. FIGURE 3 is a fragmentary
horizontal sectional view through a corner detail of the
nections between such members, the members and the 45 form shown in FIGURE 2, and FIGURE 4 is a frag
panels, and the members and other form parts consistent
mentary horizontal sectional view through another corner
with adequate strength and stiffness. At the same time
detail of the form shown in FIGURE 2.
routine assembly of the frame members will result in a
FIGURE 5 is a top perspective view of a section of
form which is straight and true because of the type of
concrete wall form with parts broken away. FIGURE
structure used.
6 is a top perspective view of a fragmentary portion of
A further object is to provide permanent frame mem—
such wall form in which parts are ‘broken away.
bers which, while strong, are of light weight and of
FIGURE 7 is a top perspective View of an end por
simple and economical construction. Nevertheless, such
tion of an upright, showing the upright’s foot in opera
frame members are extremely versatile, being usable
tive position, parts of it being broken away. FIGURE
conveniently for forms required for walls of different 55 8 is a top perspective view of substantially the same por
thickness, of different height, having footings of different
tion of the upright, but showing the upright’s foot folded
width, or placed in different positions on the footing, or
for transportation or storage of the upright.
which may be tapered from bottom to top, or inclined
FIGURE 9 is a transverse vertical sectional view
instead of being precisely vertical. Such form members
through a form for a vertical wall centered on its footing
can be constructed to be folded easily for storage pur 60 shown somewhat diagrammatically. FIGURE 10 is a
poses, or to occupy minimum space when being trans
similar view showing the wall form offset from the center
ported from one job to another.
of the footing form. FIGURE 11 is a similar view of a
Not only can the frame members be used to make
wall form centered on the footing form with one form
accurate forms with semi-skilled or unskilled labor, but
side having batter. FIGURE 12 is a similar view of a
after a workman has assembled the form members a few 65 wall form centered on the footing form, in which the
times, he will be able to put them together very quickly
wall form is inclined.
and with a minimum of effort, saving much time as well
FIGURE 13 is a vertical sectional view through a frag
as material over that required for building conventional
mentary portion of the form shown in FIGURE 5 and
forms. By reversing the procedure after the concrete
through a cross-tie tensioning block.
work has been poured the frame members and plywood 70 FIGURE 14 is a vertical sectional view through the
panels may also be demounted far more quickly than
upper portion of a form and poured concrete wall in
conventional nailed forms can be stripped.
corporating a corbel ledge. FIGURE 15 is a similar
3,035,321
3
4i
view showing a form and concrete wall section superim
posed on the form and wall section of FIGURE 14.
FIGURE 16 is a top perspective view of a fragmentary
portion of the ‘form bottom and {footing incorporating a
buttress form.
holes along the rows are spaced apart increments of one
inch. These alignment strips are secured to the battens
10 by staples 15, having their legs received in adjacent
holes of the center row in each instance.
The alignment strips 12 may be of any convenient
\length, but will be of substantial length such as eight,
twelve, or sixteen feet, and- end joints between them will
utilizing another embodiment of my invention, taken on
have substantial overlap to insure that not only the foot
line 17—17 of FIGURE 18, and FIGURE 18 is a hori
ing forms within the length of a pair of alignment strips,
zontal section through a portion of the form taken on
10 but also the forms throughout the length of any number
line 18-18 of FIGURE 17.
of alignment strips will be in precise alignment. The
The form structure to which this invention pertains in
overlapping of the alignment strips themselves is immate
corporates three major components, namely the panels,
rial because such strips are quite thin, not exceeding one
preferably of plywood, against which the concrete is
sixteenth of an inch in thickness. When the footing forms
poured, the uprights which brace the panels, and align
have been completed, as shown in FIGURE 1, therefore,
ment strips interconnecting the lower ends of the uprights
the superstructure may be set in place. The staples 15
and the upper ends of the uprights to hold such uprights
serve as centering guides for the uprights 20, constructed
in vertical position and to maintain the uprights in a row
as shown in FIGURES 7 and 8. These uprights have
in proper alignment. The uprights and the alignment
bodies composed of angle members arranged with adja
strips may be used repeatedly almost inde?nitely, and
the plywood panels may be reused a number of times. 20 cent ?anges in parallel, spaced-apart relationship, and
FIGURE 17 is a vertical sectional view through a form
the other ?anges in coplanar, oppositely extending rela
While it would be possible to utilize reusable elements for
the Wall footing forms, such forms constitute such a minor
part of the entire Wall form and consequently utilize such
a small part of the lumber and labor usually required
that little economy, either in the conservation of labor or
tionship to form a structure of generally T-shaped section.
It is preferred that the bodies of the uprights be adjust
able in effective length, and consequently the bodies may
incorporate an additional pair of angle members 22 ar
of materials, would result from fabricating the footing
ranged in lengthwise overlapping relationship with the
forms of reusable elements.
In FIGURE 1 a typical footing form is shown in plan
and upright portions of such form appear in FIGURE 5.
Stringers 1 of a width corresponding to the depth of foot 30
angle members 21. The angle members of these two
pairs are apertured to receive connecting bolts 23 at
spaced locations which will secure the pairs of angles to
ing desired are placed on edge in parallel relationship
spaced apart a distance equal to the desired width of the
footing. These stringers are usually set in the bottom of
pending upon the over-all length of upright required for
a pit or trench because it is ordinarily desired to have
the footing placed below the surface of the ground. The ~
head pivoted to the upright ends, and also of T-shaped
lower edges of these stringers should rest evenly on the
ground because they support the entire wall form and
must be level if the completed form is to be straight and
true. The spacing between these stringers is established
are identical so that the uprights may be reversed end
gether with portions of varying length overlapping, de
the particular job.
At opposite ends of the upright are a foot 24 and a
cross section.
The foot and head members preferably
for-end. Each foot is secured in the operative position
shown in FIGURE 7 by a brace member 26, and the
head member is similarly supported by a brace member
and maintained by cross cleats or battens 10, bridging be 40 27. The ‘foot and head members may be bent into the
desired cross-sectional shape by folding a metal sheet
tween the upper edges of the stringers and nailed to them.
double, and then bending its edge portions into coplanar
Filler strips 11, equal in thickness to the thickness of
the battens 10, may be nailed to the upper edges of the
stringers 1, extending parallel to them and located be
relationship forming ?anges projecting oppositely away
from each other, and in a plane perpendicular to the
central rib. The central folded portions forming the
central rib should be spaced apart far enough to leave
a deep groove, which will receive the alignment plate
anchoring staples 15 for the purpose of locating the up
rights preliminarily. Such central rib will be received
between the spaced members 22 of the upright. The
oppositely extending ?anges of the foot and head mem
tween the cleats 10 if desired, but usually little concrete
would leak through the space which would be left, even
if these ?ller strips were omitted.
Resting on the battens 10 are the lower edges of the
form panels 2. While these panels may be metal or plas
tic sheets, it is preferred that they be of plywood 5/8 or
% of an inch in thickness. A better wall ?nish is ob
tained, and these panels can be used a greater number
of times if these panels are surfaced with a plastic ?nish
bers have rows of apertures 28, which rows are spaced
apart corresponding to the outer rows of the hole groups
which will deter moisture absorption. Such plywood
panels usually are four feet in width, and consequently it t
is convenient to space apart the uprights 20‘ in two-foot
increments, so that such an upright will span the joint
of the rows 28 are in registry with holes of the outer
rows of groups 14 the faces of the aligned ?anges of
between adjacent panels, and the central portion of the
panel in each instance will be supported by another up
right.
Before the panels 2 are actually set in place, the foot
ing form is precisely straightened by sheet metal align
ment strips 12 extending lengthwise ‘along opposite sides
14 in the alignment strips 12. Also, the spacing of the
holes along the rows 28 will correspond to the spacing
of the holes along the outer rows of such groups. More
over, such spacing will be arranged so that when holes
60
uprights 20 will be coplanar with the ?anges 13 of the
alignment strips 12.
Further rows of registering holes 29 are provided in
the body angles ‘21 of the uprights if the angular relation
ship between the food and the body or the head and the
body of the upright is to be adjustable. By shifting the
of it. These strips preferably include narrow ?anges 13
projecting upwardly from the edges of the strips nearer ' anchor bolt for the ‘body end of the brace member 26 into
to the center of the form against which the lower edges
various pairs of holes 29, each consisting of holes aligned
of the form panels 2 may abut. These ?anges are spaced
in the two angles 21, the angular relationship ‘between
apart a distance equal to the thickness of the wall plus
the foot 24 and the upright body may be shifted ‘from the
the thickness of the two panel form sides. A-t spaced
right-angle relationship shown in FIGURE 7 to an acute
locations along these strips are groups of holes located 70 angle relationship or to an obtuse angle relationship.
corresponding to the positions of the battens 10 and of
For a vertical wall the head and the foot will both be
the uprights 2. The holes in each group are arranged
perpendicular to the upright body, as shown in FIGURES
in three rows extending transversely of the length of the
9 and 10. If one wall of the form is to have batter, as
alignment strips, preferably the holes in the rows are
shown in FIGURE 11, the foot member 24 will be ad
justed to an obtuse angle relative to the upright body,
aligned transversely of the rows, and also preferably the
3,035,321
and the head will be adjusted to an acute angle relation
ship to the upright body. The change in these angles
from a right angle, one an increase and the other a
decrease, will be equal, so that the head and the foot
will still be parallel. If the entire wall is to be inclined,
the foot of one upright will be disposed at an obtuse
angle to the body of such upright, and the foot of the
other upright will make an acute angle relative to the
‘body of such upright. Again, the angular relationships
6
central portion of the panel may be spaced apart approxi
mately twenty~four inches with the top and bottom
notches about six inches from the upper and lower edges,
assuming that the panels are eight feet long. At corre
sponding locations along the center of each panel are
holes 40. When the panels are set on the battens 10 in
edge-abutting relationship, the notches 4 in adjacent edges
of adjacent panels will match to form complete holes
corresponding to holes 40. The panels will be located
between the heads and the bodies will be opposite, but 10 so that the notches 4 and the holes 40 are in registry
the adjustments will be supplemental so that the angle
with the spaces ‘between the body channels of the up
of the head with the body plus the angle of the foot
rights, as shown in FIGURES 5 and 6.
with the body in each instance will be 180°. The holes
As each panel is set in place it is anchored to an up
29 should be located su?iciently close together to enable
right by form ties 41, each having a ?attened portion 42
reasonably small changes in angle between the ‘body and
the head and foot members to be made.
For storage and transportation purposes it is desirable
for the angle brace members 26 to be disconnectible
near one end and a head 43 upset on such form tie end
smaller than a hole in a form wall panel, through which
hole such head is passed. Between the ?attened portion
and the head is disposed a washer 44 for engagement
so that such members and the feet may be folded into
with the inner side of the panel 2 around the hole 40,
position alongside the body of each upright. The head 20 as shown in FIGURE 13. An expansible tensioning block
brace members 27 and head members 25 should be
engaged with the tie wire head 43 will draw the washer
similarly foldable. To facilitate such manipulation the
44 into ?rm engagement with the form wall panel.
brace members ‘26 and 27 may be made of sheet metal
The tensioning block, shown particularly in FIGURE
folded to provide sides disposed in face-to-face relation
13, includes a bent sheet metal body 45 of generally chan
ship and spaced apart far enough to ?t over the central 25 nel shape, including a web of a width greater than the
folded portion of the head or foot member as the case
spacing between the body angles 22 of an upright shown
may be, but spaced closely enough to ?t between the
in FIGURE 13, and having lugs 46 at opposite ends of
angle members 22 of the body. To fold the uprights,
the Web bent from its plane in the direction opposite
then, the bolted connections between the head and the
that in which the body ?anges project. Between the
foot and their respective ‘brace members are unfastened,
and the head or foot is swung ‘from the position of FIG— 30 ?anges of the body is received a hinged tie Wire engag
ing channel member 47, the ?anges of which ?t between
URE 7 to that of FIGURE 8 in the direction of the arrow
the ?anges of the body 45. A pivot pin swingably inter
in FIGURE 7, and the brace member in each instance
connects the body member and the tie-engaging member,
is swung in the direction of the arrow shown in FIGURE
and the head 43 of the tie is passed through the larger
7 from its position of that ?gure to‘ the position of FIG
portion of the keyhole slot in the tie-engaging member
URE 8. For ease of handling, while being of adequate
and a similar slot in the web of body 45, and the ten
strength, it is preferred that all the elements of the up
sioning block is then slid downward to engage the tie
rights except the ‘bolts be of aluminum alloy material.
in the narrow portion of such slot.
’
After being adjusted in length as may be desired and
The width of the ?anges of tie-engaging member 47
with the feet and heads vbraced at the desired angles to
the bodies, the uprights are ready for mounting on the 40 preferably is considerably less than the width of the ?anges
of body 45. Also, the ?anges of tie-engaging member 47
footing form structure shown in FIGURE 1. A row of
may taper from the location of the pivot toward the
these uprights is ?rst installed along one side of the
footing form, and their upper ends are interconnected
by upper alignment strips 3, which are the same as the
lower alignment strips 12. The outer rows of the hole
groups 14 are aligned with the rows of holes in the
upright heads 25, and double-headed nails 3!} are in
serted through registering holes to effect such intercon~
nection. Double-headed nails 16 are also driven through
swinging end of such member. A double-headed nail may
be inserted through registering holes in the opposite ?anges
of the body 45 close to the swinging member ?anges,
so that such ?anges will engage the nail designated as 52
in FIGURE 13. Such nail serves the double purpose
of retaining the member 47 swung away from body 45
in tie-tensioning position and prevents the tie dropping
holes in the foot of each upright and into strips 11, and 50 sufficiently to enable its head to move through the larger
perhaps stringers 1, to anchor the feet of the uprights
portion of the keyhole slot, thus locking the tie and
against movement in any horizontal direction and twist~
the tensioning block together.
ing. The row of uprights will thus be supported in
Where a waler 32 as shown in FIGURE 5 is employed,
reasonably stable fashion.
it can be anchored in place by the form ties extending
If the wall is unusually high or thick, additional brac 55 through the holes and notches of the form panels mid
ing of the uprights may be desirable. This may be
way between top and bottom of the form. This waler
effected by inteiposing angle member spacers 31, par
will have in it holes 32 of a size to receive through them
ticularly at the bottom, and, if desired, also at the top of
the heads 43 of form ties 41, as shown in FIGURE 13.
the wall. The ends of these horizontal spacer members
may be secured to the uprights by the bolts interconnect
ing the bodies and foot braces of the uprights, or they
may be secured to the bolts 23 interconnecting the body
angles 21 and 22 of the uprights. Additional ‘horizontal
The waler will ?rst be hung on tie ends inserted through
such holes. Tensioning blocks may then be engaged with
the projecting tie ends and tensioned.
It will be evident that by following the procedure de
scribed all the panels 2 and the uprights constituting one
bracing may be afforded ‘by walers 32, also preferably of
angle shape, which may extend along the central portion 65 side of a Wall form may be. assembled with the form ties
41 in place before any components of the other form wall
of the form and span a considerable number of the up
are
set up. The next step, then, will be to set the panels
rights. Such walers may be supported by form ties, as
2 for the other form wall in place. The holes 40 and
will be explained hereinafter.
When one row of uprights has been placed and. inter
notches 4 of these panels will be ?tted over the heads
connected as‘described, the form wall panels 2 for the 70 on unanchored ends of the form ties, and the panels moved
toward the form wall already set up until the panels en
corresponding side may be stood edgewise on the battens
10 abutting the uprights. Assuming that each of the
gage the tie Washers 44 and they in turn engage the
form Wall panels is four feet wide and the uprights are
?attened portions 42 adjacent to the free ends of the
spaced apart two feet, the opposite edges of the panels
ties. Next the uprights will be placed in position standing
will have in them semi-circular notches 4 which in the 75 on the alignment strips 12, and the tensioning blocks may
3,035,321
7
be ?tted loosely on the tie ends in engagement with the
bodies of the uprights.
When the panels and uprights for the second form walls
have thus been loosely assembled, the feet of the uprights
may be secured in place in the same manner as shown
in FIGURE 5 by double-headed nails 16, and the upper
alignment strips 3 may be placed on the head of the
8
forms, the lower tier of forms may be removed, and, if
desired, superimposed upon the second tier of forms for
use in constructing a still higher wall. By following this
procedure two sets of forms may be shifted alternately
upward to construct a wall of any desired height.
Form elements of the general type described may be
utilized in constructing a eorbel ledge, as illustrated in
FIGURES l4 and 15. To construct such a wall structure,
the uprights 26 on the outer side of the wall will be ad
second row of uprights and secured in place by double
headed nails 16. If longitudinal stiffening members 31
are used, they will now be inserted along the second wall 10 justed longer than the uprights for the inner form wall
by an amount equal to the thickness of the eorbel ledge
of the form, and a waler 32 may be hung on the ties
C desired, plus the thickness of a cap strip 35 overlying
along the central portion of the second wall. Next the
the upper alignment strip 3. This cap strip will prefer
tensioning blocks will be expanded to tighten the form
ably be of dimension lumber and will be wide enough
ties, and such operation will complete the erection of the
to
form a eorbel ledge of the desired width plus provid
wall form for a single story wall.
ing a footing for the side form board 36 of the eorbel
Concrete will be poured into such a form in the usual
ledge. Battens 37 nailed to the upper edge of the side
way and allowed to set. To remove the forms after the
board
36 and to the alignment strip 3 at the opposite
concrete has set, the tie-engaging member of each ten
side
of
the form will hold the form board 36 upright
sioning block is pried outward enough to enable nail 52
to be withdrawn for collapsing the block. These ten 20 during pouring. Also, a board 38, such as a two-by-four,
may be placed in the concrete according to conventional
sioning blocks are then removed, and the upper align
practice to form a key groove for receiving concrete
ment plates 3 lifted off the heads of the uprights. The
from the next pour above, or to be left in place to con
walers and spacers 31 are next taken off, enabling the
stitute a nailing strip to which ?oor joists, for example,
individual uprights to be removed by pulling double
be nailed.
headed nails 16 and sliding the uprights off the ends of 25 may
If a further wall is to be poured above the eorbel
the form ties. As soon as the uprights are removed, the
ledge, the battens 37 will be removed after the concrete
lower alignment strips 12 may be unfastened and taken
in the lower wall has set, and the strip 38 will be lifted
off. The panels 2 are thus freed to be slipped off over
out of its groove. Top form boards 39 and 39' will then
the tie wire ends because holes 40 are larger than their
be placed on top of the eorbel and on the alignment strip
heads 43.
The footing forms may or may not be re
moved, as desired, and the ends of the form ties 41 which
were anchored in the forms may be broken off slightly
behind the outer surface of the wall at the ?attened
portions 42.
As thus far described, the concrete forms would be used
for straight walls, Whether vertical, inclined or tapered.
3 at the opposite side of the wall, and on these boards
will be erected the forms for the next higher wall sec
tion in accordance with the technique described above.
It will be evident that the eorbel ledge may be formed
at each ?oor level, if desired, to serve as a bearing for
?oor joists.
With slight modi?cation, forms of the type described
Usually corners will be required in concrete wall forms,
above may be used in making concrete walls having but
and the form structure for this purpose is shown in FIG
tresses. For such walls the form for the planar wall will
URES l to 4, inclusive. The alignment strips 12 may
have inserted between two regular form wall panels a
be arranged in overlapping relationship at the exterior of 40 special narrow panel 6 which will be two feet in width.
the corner, as shown at the upper left of FIGURE 1, but
at the interior of the corner the alignment strips will be
cut off so that their ends will not project into the wall.
Also the ?ange 13 on one of the outer alignment strips
will be cut off to enable the faces of the main portions
of such strips to contact. The battens 10* can be located
so that one panel 2 will be arranged with its edge abut
ting the face of the outer form wall panel perpendicular
to it. Such perpendicular wall panel, as shown at the
upper left of FIGURE 2, should project outwardly be
yond the abutting edge of the other wall panel, so that
a connecting angle member 33 may be fastened by bolts
or other means to the adjacent panel edges, as shown. A
detail of this angle connection is shown in FIGURE 3.
The extent of projection of one panel edge beyond the
abutting edge of the other panel will establish the de
sired location for the other cleats It) so that the holes
It will have two rows of apertures near its center to re
ceive special long form ties 41’. For anchoring the ends
of these form ties ‘at the side of the wall form opposite
the buttress, an angle or channel stiffening member 60
may extend horizontally between the uprights 20 adja
cent to opposite edges of the panel 6.
At the buttress side of this wall form a buttress form
box will be provided, including panel 61 spaced outward
from the panels 2 forming the major portion of this form
side, boards 62 perpendicular to panel 61, and narrow
boards 63 between boards 62 and the adjacent form
panels 2. The width of board 63 plus the width of panel
61 should equal two feet, and the width of panel 61 will,
of course, be selected in accordance with the desired
width of the buttress.
The width of boards 62 will cor
respond to the distance the buttress projects, and pref
erably the amount of buttress projection should be the
49 and notches 4 of the outer wall panels will be aligned
same in all instances although the width of buttresses may
differ if necessary. By selecting boards 62 of standard
Having set up the outer wall of the form, the panels 60 width the outer panel 61 of the buttress form can be
with them.
2 for the inner form wall at the corner may be cut to
the appropriate width for aligning the holes in such inner
panels with the holes in the outer panels. The ?rst of
the inner panels to be placed will have its end extended
to a position substantially ?ush with the position for the
inner face of the other inner form Wall. A Z-bar strip
34 will then be nailed to the‘edge of this panel, as shown
in FIGURE 4, and the abutting edge of the other inner
wall panel may then be engaged in a corner of the Z-bar
to hold it against movement by inward pressure created '
by the concrete poured between the form walls.
If it should be desired to pour the wall for a second
story, one or more tiers of similar forms may be super
imposed upon the forms described above, and after the
wall has been poured and set in the ?rst two tiers of
secured in place by a U-shaped retaining bar 64 having
its opposite ends anchored by bolts to adjacent uprights
20. The tensioning blocks for the form ties 41' may then
bear on this anchoring member, which will be apertured
to receive the heads 43 of the ties.
For such a buttress the footing also should be enlarged
by provision of an o?set box portion 17, and this foot
ing box portion will be covered by a U-shaped plate 18
having a ?ange 19 like the alignment strips 12. This
?ange will ?t the flange 13 of the alignment strips and
interconnect the adjacent ends of adjacent alignment
strips. If walers are employed, they will be interrupted
at the uprights adjacent to the buttress form, but the
necessary stiffness to the form will be provided at the
3,035,321
10
buttress location by using as many U-shaped buttress re
taining bars 64 as may be necessary.
While the concrete form described above has for the
most part utilized framework components of metal, it is
entirely possible to incorporate the principles of my in
vention in a concrete form employing nearly all wood
parts, as shown in FIGURES 17 and 18. In this instance
the portion of the form for the footing including the
stringers 1 and the cross-cleats or battens 10 with the
?ller strips 11 between them is the same as described
previously. The uprights, however, are fabricated from
boards 7 disposed in parallel planes spaced apart slightly
and secured together by bolts 70. The foot for each of
these uprights is formed from two angle members 71
having corresponding ?anges extending oppositely'in a
plane perpendicular to the planes of boards 7, and their
other corresponding ?anges in face-to-face engagement
with the outer sides of boards 7, respectively, adjacent to
one end of them.
The boards are held in such spaced
relationship by a spacer member 72 disposed between the
parallel ?anges of angle members 71 and secured by
bolts 70 and by additional spacer elements located at
intervals along the length of boards 7 and at the opposite
ends of such boards.
free ends of the cross ties, and the uprights for this
second form wall are then secured in place and the
other ends of the cross ties anchored to them by the
tensioning blocks 45.
When the form panels and uprights have been as
sembled in this manner, the upper edges of the forms will
also be aligned in a manner similar to that already de
scribed, but in this instance the upper aligning strips
76' may also be boards secured in place by double-headed
10 nails 77 driven through holes in the flanges of the head
angles extending transversely of the upright boards. The
form Will then be ready to receive concrete.
It will be appreciated that the general technique of
form assembly utilizing components principally of wood
15 is very similar to that described in connection with the
form structure utilizing metal aligning strips and uprights.
Where wood components are used, therefore, the width
of the footing may be varied as desired, the position of
the aligning strips relative to the footing and conse
quently the position of the wall relative to the footing
may be shifted, the form walls may be located in order
to enable a wall of desired thickness to be poured, and,
if desired, the form walls or a wall may be inclined for
the purpose of sloping the wall or giving batter to it.
At the other ends of the boards 7 head angle members 25 All such variations will follow the precedure for such
73 are arranged at opposite sides of each pair of boards
rami?cations discussed in constructing forms using metal
forming an upright, and these angles likewise are disposed
components.
with corresponding ?anges extending oppositely and dis
posed in a plane perpendicular to the planes of the boards
7. Like the angles forming the foot of the upright, the
other ?anges of these head angles are secured in face-to
face contact with the outer surfaces of the boards 7 by
bolts 70. Preferably two such bolts are used to prevent
tilting of the angles, although only a ‘single such bolt
may~be used at other locations along these boards.
The uprights composed of the boards 7, angles 71 and
73, spacers 72 and bolts 70, preferably are symmetrical
An advantage to the provision of the alignment strips
76 or 3 supported on the upper ends of the uprights 7
or 20 is that such alignment strips are su?iciently ?rmly
supported by the uprights to carry the weight of a person
standing on top of the form for the purpose of rodding
the concrete in the form to eliminate air pockets from it.
I claim as my invention:
1. A demountable concrete form comprising two up
right, generally parallel form walls spaced apart, each
of said walls including panels of wood material of greater
so that they may be used either end up. In most appli
height than width having upright edges disposed in edge
cations uprights of such construction may be substituted
abutting, junction-forming relationship, and the panel
directly for the metal structure uprights described above. 40 junctions in the two walls being in registry transversely
The board 7 for most form work may be one-inch lum
of said walls, several uprights disposed at the side of each
her four inches wide, although if greater strength is de
wall opposite the other wall with each upright spanning
sired wider boards may be used. Such uprights may be
an upright junction of abutting upright edges of two of
designed with angularly adjustable heads and feet to en
said panels, said uprights respectively abutting in con
able them to be used in forms where batter is required,
tiguous backing engagement face portions of said junc
but for such applications metal uprights are preferable. 45 tion-forming panels adjacent to such junctions but de
In FIGURES l7 and 18 the essentially wooden up
tached from said panel, said abutting upright panel edges
rights are shown used in forms composed entirely of
being complementally notched in registry with the up
wood except for the form ties 41, the tensioning blocks
rights spanning the junctions formed by such abutting
45, the head and foot angles of the uprights, bolts 70
upright panel edges, respectively, and said uprights hav
and nails. In this structure instead of using metal align
ing apertures therethrough in registry with such com
ing strips on the footing form boards 74 are used, which
plemental panel notches, ties extending between said op
may be suitably nailed to the stringers 1 and battens 10.
posite form walls, passing through said panel notches and
When these alignment strips have been thus properly
the apertures of said uprights respectively in registry
located, the wooden uprights may be secured to such
therewith, interconnecting said uprights at opposite sides
boards in appropriate locations both transversely and
of the form and engaging the inner sides of said wall
lengthwise of the boards by double-headed nails 75,
panels for holding said panels in such backing engage
driven through holes in the ?anges of foot angles 71 ex
ment with said uprights, means aligning the lower edges
tending transversely of the upright boards 7.
of said panels in coplanar relationship in said respective
The spacing of the uprights lengthwise of aligning
spaced form walls, each of said panels being of a height
60
strips 74, as shown in FIGURE 18, will be similar to the
to extend continuously from adjacent to the bottoms of
spacing discussed in connection with the metal uprights.
said uprights engaged therewith to a location above the
Conveniently such spacing may be every two feet, so that
upper ends of such uprights, and two upper aligning
the panels 6 constituting the form walls, which preferably
strips respectively having surfaces disposed coplanar with
are four feet in width, may be disposed with their edge
the panel-abutting portions of said upright and in con
joints in registry with the space between iboards 7 of 65 tiguous backing engagement with the upper portions of
uprights, as shown in the lower portion of FIGURE 18.
the back surfaces of the panels of said Walls, said align
The cross ties 41 will be inserted through holes in the
ing strips extending across such junctions of such panels
panels erected ?rst along one side of the form and ten
for aligning the upper edges of the panels in said re
sioning blocks will be engaged with the ends of such ties
70 spective form walls in coplanar relationship, and said
inserted between the boards of the uprights so that the
aligning strips respectively overlying, being supported
tensioning blocks will bear against the outer edges of the
on, and interconnecting the upper ends of several of the
uprights, as shown in FIGURE 18. As previously de
uprights abutting the panels of their corresponding walls.
scribed, the panels for the other side of the form are
2. The demountable concrete form de?ned in claim 1,
then put in position with holes in them engaged over the 75 and additional uprights between adjacent ones of the
3,035,321
11
several uprights and between opposite upright edges of
panels of the walls, disposed in contiguous backing en
gagement with such panels of the walls, such panels hav
ing apertures therethrough in registry with said ad
ditional uprights and said additional uprights having
apertures in registry with the panel apertures, and means
engaged between the heads of the ties and the uprights
for connecting the ties to uprights at opposite sides of the
12
the lower edges of said panels in coplanar relationship
in said respective spaced form walls, each of said panels
being of a height to extend continuously from adjacent
to the bottoms of said uprights engaged therewith to a
location above the upper ends of such uprights, and two
upper aligning strips respectively having surfaces dis
posed coplanar with the panel-abutting portions of said
upright and in contiguous‘ backing engagement with the
upper portions of the back surface of the panels of said
form.
3. A demountable concrete form comprising two up 10 walls, said aligning strips extending across such junc
tions of such panels for aligning the upper edges of the
right, generally parallel form walls spaced apart, each
panels in said respective form walls in coplanar rela
of said walls including panels of wood material of greater
tionship, and said aligning strips respectively overlying,
height than width having upright edges disposed in edge
being supported on, and interconnecting the upper ends
abutting, junction-forming relationship, and the panel
junctions in the two walls ‘being in registry transversely 15 of several of the uprights abutting the panels of their
corresponding walls.
of said walls, uprights each including two parallel elon
gated members and means spaced lengthwise of said
elongated members and securing them together in spaced
relationship leaving slots between said securing means,
several of said uprights being disposed at the side of
each wall opposite the other wall with each upright span
ning an upright junction of abutting upright edges of
two of said panels, the elongated members of said up
rights respectively abutting in contiguous backing en
gagement face portions of said junction~forming panels 25
adjacent to such junctions but detached from said panels,
said abutting upright panel edges being complementary
notched in registry with the slots between the spaced
elongated members of the uprights spanning the junctions
formed by such abutting upright panel edges, respec 30
tively, ties extending between said opposite form walls,
passing through said panel notches and the slots be
tween said elongated members of said uprights respec
tively in registry therewith, interconnecting said uprights
at opposite sides of the form and engaging the inner 35
sides of said wall panels for holding said panels in such
backing engagement with said uprights, means aligning
References Cited in the ?le of this patent
UNITED STATES PATENTS
986,565
1,525,217
1,597,675
1,747,063
1,795,338
1,970,547
2,020,912
2,261,575
2,298,837
2,312,983
2,387,445
2,595,123
2,614,311
2,632,228
2,713,711
Hedrich _____________ __ Mar. 14,
Zollinger _____________ __ Feb. 3,
Dunseath ____________ __ Aug. 31,
Sullivan _____________ __ Feb. 11,
Knipe ______________ __ Mar. 10,
Anderson ___________ __ Aug. 21,
Schenk ______________ __ Nov. 12,
Ulrich _______________ __ Nov. 4,
Oswald ______________ __ Oct. 13,
Summers _____________ __ Mar. 2,
Herring _____________ __ Oct. 23,
Callan ______________ __ Apr. 29,
Shook _______________ __ Oct. 21,
Huntington __________ __ Mar. 24,
Eandi _______________ __ July 26,
1911
1925
1926
1930
1931
1934
1935
1941
1942
1943
1945
1952
1952
1953
1955
FOREIGN PATENTS
93,184
Switzerland ___________ __ May 1, 1922
UNITED STATES PATENT ()FFICE
CERTIFICATE OF CORRECTION
Pa tent No, 3,035,321
May 22, 1962
Victor E, 0, Hennig
corrected below.
Column 12, lines 19 to 37, strike out the list of
references cited and insert the following list:
UNITED STATES PATENTS
955,304
986,565
1, 171 , 734
1 ,525,217
Babel —————————————————— ——
Hedr'ich ———————————————— ——
McArthur —————————————— ——
Z011inger ———————————— —-
Apr, 19, 1910
Mar. 14, 1911
Feb° 15, 1916
Feb,
3, 1925
1,597,675
1 , 747,063
1 , 795,338
1 ,970,547
Dunseath ————————————— ——
Sullivan ————————————— —Knipe ——————————————————— ——
Anderson ——————————————— —~
Aug,
Feb,
31 ,
11,
Mar,
10,
Aug,
21 ,
1926
1930
1931
1934
2,020,912
2,099,077
2, 107,427
Schenk ——————————————— —— Nov,
Pessagno et a1 ————————— —— Nov.
Schwarzler —————————————— ~— Feb,
12,
16,
8,
1935
1937
11/55
2, 236,616
B0sc0——-—U———---~——-—--——~—--~- Apr,
1 , 1941
2,261,575
Ulric ’———————————————————— -— Nov,
4 ,
1941
2, 298,837
2,312,983
Oswald ——————————————————— '- Oct,
Summers ————————————————— ~— Mar‘.
13,
2,
1942
1943
2,352, 783
Geer‘ —————————————————————— --July
2,387,445
Herring —————————————————— ~— Oct,
23,
4, 1944
2,442,292
Har’c-—--——~-——~—--~-~---—— May
25, 1948
26,
1945
2,535, 277
Fame —————————————————————— —— Dec .
2,595, 123
Callan ————————————————————'— Apr‘, 29,
195'
2,614,311
2,632,228
Shook-——---~--———-—---—~———~>-—-~ Oct, 21, 1952
Huntingt0n~~~~~—M~~——~~Y—-— Mar. 24, 1953
2,713,711
Eandi~-~—--—~——~——---~-—~--~—~——Ju1y
1952
26, 1955
FOREIGN PATENTS
93, 184
Swi tzer1and—-—~——'—~——-~—— May
1,
727,391
Germany ———————————————— ——July
9, 1942
Signed and sealed thi
1922
16th day of April 1963.
(SEAL)
Attest;
ERNESi W. SNIUER
Attesting Officer
DAVID L” LAUU
Commissioner of PaLenLs
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