U.S. patent number 3,815,858 [Application Number 05/322,969] was granted by the patent office on 1974-06-11 for roll out formwork support.
This patent grant is currently assigned to Waco Scaffold & Shoring Co., Division of Bliss & Laughlin Industries. Invention is credited to Richard C. Mocny, Francis B. Mueller.
United States Patent |
3,815,858 |
Mocny , et al. |
June 11, 1974 |
ROLL OUT FORMWORK SUPPORT
Abstract
An adjustable support for shoring and rolling out formwork
intact for reuse in pouring concrete slabs for successively higher
floors in which a sleeve screw telescopes freely in a tubular
support mounted on a structural column and is threadably supported
by a non-rotatable nut resting loosely on the tube with a winged
nut above it. The upper ends of the sleeve screw rotatively
telescope with each other, one having a spindle received internally
in the sleeve screw end and the other a collar received around the
sleeve screw as adjustably supported by the winged nut to vary the
relative heights of the roller and shoe. The sleeve screw is
rotatable by a hand or power wrench from below the tubular support
to adjust the roller and shoe vertically as a unit.
Inventors: |
Mocny; Richard C. (Prospect
Heights, IL), Mueller; Francis B. (Downers Grove, IL) |
Assignee: |
Waco Scaffold & Shoring Co.,
Division of Bliss & Laughlin Industries, (Schiller Park,
IL)
|
Family
ID: |
23257237 |
Appl.
No.: |
05/322,969 |
Filed: |
January 12, 1973 |
Current U.S.
Class: |
248/295.11;
248/354.1; 249/219.1 |
Current CPC
Class: |
E04G
17/16 (20130101) |
Current International
Class: |
E04G
17/16 (20060101); A47f 005/10 (); A47h 033/00 ();
E04g 017/16 () |
Field of
Search: |
;248/25R,295
;249/219R,20,21,22 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Foss; J. Franklin
Claims
What is claimed is:
1. In a device of the class described, the combination of a
plurality of vertically oriented horizontally spaced work support
tube means removably secured to vertical weight supporting members
and having an upwardly directed weight bearing end located well
above a work space on a floor,
jack means telescopically received in each support tube means
including screws whose major radial dimension engage the respective
tubes in telescopic rigid erecting relationship,
nut means engaging said screws and supported on said ends to cam
the screws upwardly or downwardly predetermined distances in weight
supported relationship on said ends when the screws are
rotated,
roller fixtures rotatively supported on the upper ends of the
screws to engage an object to be supported in rolling
relationship,
head fixtures non-rotatively telescoping with the respective roller
fixtures and rotatively mounted on the screws to engage a formwork
member in supported rigid relationship,
a manually controlled nut on each screw above said nut means
adjustably carrying the weight of each head fixture when raised
above the level of the roller fixture, and
means for selectively rotating said screws to coordinate the height
of said roller fixtures.
2. The combination defined in claim 1 in which said screws are
sleeve screws having a coarse thread and open at the top, and said
roller fixtures each including a spindle rotatively telescoping in
said open top to rest on the upper end of the respective sleeve
screws.
3. The combination defined in claim 1 in which said manually
controlled nuts are winged nuts and said head means includes at
least one upright element engaging the side of a formwork member
resting on said roller fixture.
4. In a device of the class described for fixedly supporting and
rolling two objects at different levels with respect to each other
in weight supported relation, one object of which is a support that
has a tubular vertically oriented member, the improvement
comprising,
jack screw means telescopically received rotatably in said tubular
member for close axial alignment at one of its ends and having a
heavy weight bearing thread intermediate its ends,
first nut means carried by the screw means in threaded relationship
intermediate its ends for engaging the tubular means in screw
supporting adjustable relation with respect thereto,
means interengaging said nut means and support to hold them against
relative rotation,
a roller fixture rotatively supported upon the other end of said
jack screw means to engage the other one of said objects,
a head fixture rotatively supported on said other end in
telescoping relation with the roller fixture to rigidly engage said
other one of said objects under weight bearing conditions when
disposed above the level of said roller fixture,
second nut means carried by the screw means above the first nut
means, and
means for rotating said screw means.
5. In a device of the class described for detachable mounting on a
vertical member employed in supporting floor slab formwork, the
combination of a support member having a base member with laterally
spaced holes and vertically oriented tube means having an end
spaced a predetermined distance above a work space on a floor,
means for releasably supporting said base member to said vertical
member at each of said holes, and a jack means freely received
telescopically in said tube means in weight supported relationship,
said jack means including
a screw member telescopically received in said tube means having
laterally extending thread elements spaced axially along its
surface, which engage said tube means in rigid erecting
relationship,
cam nut means received by the screw member intermediate its ends
located in weight bearing relation against said end of the tubular
means in height-adjusting relation to move the screw member
upwardly and downwardly predetermined distances in supporting
relation upon rotation of the screw member,
means interconnecting the cam nut means and support member against
relative rotation in its weight bearing position,
winged nut means on the screw member above said cam nut means,
head fixture means rotatively supported upon the upper end of said
screw member to engage formwork and having a collar means resting
against said winged nut means to move upwardly and downwardly upon
rotation of the winged nut means,
roller fixture means rotatably carried by said screw member at the
top thereof in telescoping relation with the head fixture means to
engage formwork in roll out supported relation, and
wrenching means on said screw member for turning it.
6. The device defined in claim 5 in which said screw member is an
externally threaded sleeve member and said roller fixture means
includes a spindle received in the top end of the screw member with
a roller support bracket to engage the upper end of the sleeve
member in weight bearing relationship.
7. The device defined in claim 5 in which said head fixture means
comprises a yoke defining a planar upper surface to engage the
bottom of a formwork beam in supporting relation and upright
members disposed on opposite sides to engage the sides of the
formwork beam in non-rotatable relationship.
8. The device defined in claim 5 in which said head fixture means
defines a horizontal surface to engage the bottom of a formwork
beam, and upright elements to engage the sides of the formwork at
least two of which are spaced from each other across the axis of
screw rotation a distance substantially greater than the width of
the beam with at least one of them taller than another one by a
distance at least one-half the lead of the thread on the screw to
engage the side of the beam to locate the roller crosswise of the
beam when rotated and lifted by adjustment of the screw.
9. The device defined in claim 6 in which said collar means and
spindle overlap each other and an upper end wall portion of said
screw member in coaxial mutual strengthening relationship.
10. The device defined in claim 6 in which said wrenching means on
said screw member comprises a wrench receiving element on the lower
end of said sleeve member defining a drain passage from said sleeve
member.
Description
CROSS REFERENCE
Co-filed applications of Lane, Ser. No. 264,277 for Roll Out Form
Support; and Moritz et al., Ser. No. 264,274, for Shoring Scaffold
and Formwork Support.
BACKGROUND OF THE INVENTION
Wherever formwork is to be supported for the pouring of concrete
floor slabs, adjustments at the top or bottom of many supports have
to be made for vertical or horizontal positioning with or without
relative movement in one or more directions. Either the footing or
vertical location for each support member on columns has to be
accommodated with respect to the others, or the position of the
formwork must be adjusted both vertically and horizontally for
coordination. It would be of great convenience to make directional
as well as vertical adjustments with both rolling and rigid members
engageable with the framework to hold or move a unitary supported
load at each support station into proper orientation.
Furthermore, work scaffolds and formwork are generally moved intact
from place to place to perform their functions and it is desired
for repeated uses, to roll one or the other of them intact between
work positions and there rigidly support them at adjusted heights
or inclinations.
Although reusable formwork support brackets mounted on the
structural columns of a building under construction have been used
heretofore which involve lowering formwork a short distance onto
fixed bracket rollers so that the framework can be removed intact
and re-used for other sections of flooring, the working space for
handling and adjusting the formwork position is limited,
particularly if a bracket itself is also to hold the formwork
rigidly in place during slab pouring operations. Difficulties in
mounting, adjusting, servicing and removing the brackets and
formwork cause delay and also the lack of space inhibits the use of
unitary multi-level forms.
Moreover, removable formwork support structures which have brackets
that include formwork roll-out rollers rigidly oriented
directionally and rotatable heads horizontally spaced therefrom
required the strict positioning of mounting bolts sleeves
vertically and laterally in both square and round columns when the
columns are being poured to support the next floor slab.
Furthermore, due to high location of supports and the adjustment
for rigidity, special tools are required, female threads are fouled
and male threads are difficult to clear of damaging corrosive
cement. Furthermore, a non-adjustable roll-out level incurs
interference and other difficulties that may arise which involve
alteration or damage to the formwork in clearing and moving it.
Heretofore, due to their high location and limited clearance
relationship, adjustable jack screw mechanisms that are
mechanically integrated as a part of the whole support assembly
provide a total weight that must be manually handled when securing
and removing it from its high support position.
SUMMARY OF THE INVENTION
In the present invention the support is a simple frame fabricated
by welding, or a steel casting, and having a vertically oriented
tubular element which closely but freely receives an externally
square-threaded tubular sleeve member of a screw assembly in axial
telescoping relationship for rigid erectness. Two nuts are carried
by the sleeve screw. The lower nut non-rotatably engages the
support in weight bearing relation for vertical adjustments by
rotating the sleeve screw from its lower end. The upper nut is a
winged nut.
The upper end of the screw rotatably supports a roller fixture and
also a load bearing head fixture. They non-rotatively telescope
with each other as adjusted by the winged nut to their weight
bearing positions. The relative adjustment between the roller
fixture and head is not changed when they are moved vertically as a
unit by sleeve screw rotation. Thereby the roller and shoe jointly
have universal directional orientation as well as a separate
vertical adjustment with respect to each other. The roller fixture,
the head fixture and the sleeve screw can be lifted from their
respective supported positions separately or collectively for
repair, shipment and replacement.
The support can be installed or removed without the screw assembly
being present and the screw assembly can be installed or removed
easily by axial telescopic movement vertically, or horizontally, to
or from its working position after the support has been lifted and
is being secured in place. Also, the wing nut can be grossly
adjusted before the screw assembly is installed. Therefore a
workman merely finalizes the major adjustment with an extension
wrench from below the support with substantial savings of time and
effort.
Another object and advantage of the invention is the ready
interchangeability and adjustment of self contained screw
assemblies of different lengths for special applications.
Additionally, the invention can be used with other vertically
disposed tubular supports secured to structural columns or
independently standing shoring members that might be required
between columns having a wide span.
Other and further objects and advantages will become apparent from
the description and drawings which follow including the ease of
fabrication of the embodiments shown; simplicity of operation and
servicing; and, minimized effort to adjust relative positions of
parts with minimum friction.
IN THE DRAWINGS
FIG. 1 is an upwardly directed perspective view showing one of the
embodiments of the invention operating to support formwork for a
poured concrete floor slab;
FIG. 2 is a perspective view of the support shown in FIG. 1 in an
intermediate stage of assembly;
FIG. 3 is a vertical sectional view of the assembled support shown
in FIG. 1;
FIG. 4 is a cross-sectional view of the assembly shown in FIG. 1
taken on line 4--4 of FIG. 3;
FIGS. 5 and 6 are fragmentary, partly sectional views showing parts
of the embodiment in FIG. 1 in alternate operational positions;
FIG. 7 is a view similar to FIG. 3 showing a modified form
thereof;
FIG. 8 is a perspective view of a vertical shoring tube, not bolted
to a column, in which the jack screw is received at the top to
adjustably support formwork between widely spaced columns.
THE PREFERRED EMBODIMENTS
Referring in further detail to the drawings, a concrete structural
column 10, of a building that is being built of poured concrete, is
shown in FIG. 1 supporting formwork 12 upon which concrete is
poured to form the slab 14 of the next upper floor. After
hardening, another series of structural columns will be formed on
the slab 14 as extensions of the others and the formwork
illustrated can be lowered a substantial distance and rolled out
intact in a horizontal direction, and then rigidly relocated on the
new columns for reuse in forming the next slab above slab 14,
etc.
Although the frame of the formwork may include I beams, timbers 16
are shown by way of simple illustration which support plywood form
panels 18. The column 10 is one of many that are spaced and aligned
in parallel rows in a repetitive pattern with each having spaced
horizontal tubular elements 20 embedded in them to receive
removable bolts or studs 22 therethrough that accept nuts 26
thereon to clamp the frame portion 23 of the support 24 in place.
The support includes the tube 32 to receive and support the screw
assembly 25, upon which the formwork is removably supported at
adjustable heights.
Although the support 24 can be made as a single steel casting
without need for extensive machining, it is shown as comprising a
section of a channel beam 27 with mounting tubes 28 extending
through the flanges 39 thereof and across the web portion 34 as
welded thereto. The tubes receive the mounting studs or bolts 22
that clamp the support removably to the column by the use of nuts
26. Spaced right triangular braces 36 are welded on the opposite
side of the web 34 to secure the tube 32 rigidly in place along one
edge of the channel beam section with the ends 33 of the tube
preferably terminating a substantial distance inwardly from
opposite ends of the channel beam section. The support 24 may be
secured by the nuts 26 and bolts 22 with either end of the channel
beam 27 up, and the flanges 39 and braces 36 can serve as gripping
elements or handles during installation, adjustment and removal.
Generally only two bolts are required.
The nuts 26 on the bolts 22, when tightened, clamp the flange 39
that is remote from the tube 32 flat against the column preferably
at a height well below the position of the framework to provide an
easy working space and a substantial roll-out drop. As later
discussed, the screw assembly 25 can be slipped into place during
the applications of the two bolts and nuts as when the tube is
momentarily disposed horizontally with one bolt in place. For this
purpose the tube 32 has an opening 40 (FIG. 4) therethrough and
telescopically receives therein the lower end 31 of the screw 42 of
the screw assembly. The screw may have external longitudinal
undulations thereon such as a rack, or preferably a square coarse
helical thread 41 such as a modified four pitch Acme, although
shown for simplicity in the drawings as a V-thread, for rotative
vertical load bearing and adjustment and carries two nuts 38 and 58
above the tube 32. Preferably the screw 42 is a sleeve more than
twice the length of the tube 32 with the thread 41 ending, or
obstructed, at a point 46 spaced from its lower end a distance
substantially equal to the length of the tube 32 leaving the lower
end of the screw 42 preferably smooth as at 43 to fit with the tube
and also to substantially reduce thread contamination from the
bottom of the tube. The sleeve screw is preferably provided at its
lower end with a wrenching member. It can be machined or formed
square, or a cast member can be used but is illustrated as a hex
head 30 nut welded thereto at 35 for engagement by a crank or power
wrench (not shown) for rotating it. The opening 37 through the nut
drains the interior of the sleeve screw 42 to avoid dangers of
water collection and freeze ups.
The upper end of the sleeve screw 42 removably supports two
fixtures rotatively which telescope with each other and the sleeve
screw. The sleeve screw 42 internally receives the vertical spindle
47 of a roller fixture 48 that has a yoke 50 secured therto whose
arms 51 carry an axle 52 that journals the roller 54. The bight of
the yoke 50 rests rotatively on the flattened upper end 55 of the
sleeve screw.
The other fixture 56 is load bearing and has a depending collar 57
received externally on the upper end of the sleeve screw 42 as
rotatively and adjustably supported in axial telescoping
relationship by the winged nut 58 threaded on the sleeve screw
adjacent to its upper end. The collar 57 carries a yoke 60
telescoping laterally over the roller fixture 48 and terminating in
diverging flat arms 63 that define a flat head 62 to engage a beam
of the formwork 12. The edges of the yoke 60 are reinforced by
contour cut plates 61 welded thereto and defining a well 65 into
which the roller fixture can non-rotatively telescope to a level
below the head 62.
Vertical ears or pins 64 provided upon the head receive the
formwork beam 16 between them for geometric alignment and the beam
in turn thereby non-rotatively supports the head fixture 56 and
roller fixture 48 against rotation relative to the support 24. This
non-rotative engagement of the pins 64 with the beam also prevents
rotation of both the head 60 and the roller 54 on the top of the
screw regardless of which one is actually in contact with the beam
16. The relative support adjustment between the head 62 and roller
54 is not disturbed when bodily raising and lowering the two
fixtures as a unit when turning the screw 42 in the cam nut 38 for
gross or fine adjustment levels.
Thus, the roller and head fixtures are rotatable on top of the
screw 41 for universal directional orientation in a horizontal
plane to engage a formwork beam so oriented. Adjustment of the
winged nut 58 on the sleeve screw 42 raises or lowers one fixture
with respect to the other without relative rotation between them
and the screw 42 bodily raises and lowers them as a unit in any
adjusted relation by being rotated in the non-rotative nut 38.
Accordingly, the roller is freely orientable to accommodate the
direction of endwise movement of the beam, and also be readily
repaired if damage is incurred. Either the roller or head, or both,
can be removed and replaced by merely lifting either or both
members from the upper end of the screw sleeve.
The lower nut 38 on the sleeve screw 42, as mentioned, is
non-rotatably supported when the sleeve screw rests in place on the
top 67 of the tube 32. As noted, the tube 32 is shorter than the
web portion 34 of the channel beam 37, preferably at both ends 33,
by a distance approximately the height of the nut 38 and the space
between the web 27 and the exterior surface of the screw 42 is less
than the major diameter of the hex wrenching contour of the nut 38.
Thereby, when the screw jack assembly is lowered into place any
minor diameter flat portion 68 of the hex contour of the nut 38
will be disposed next to the web 27 (FIG. 4) and will be thereby
held against rotation when the nut 38 is in weight bearing relation
on the tube 32.
With the nut 38 resting on the tube 32, whichever end is up, the
load of the formwork beam 16 is carried by the nut 38 from the
screw sleeve 42 regardless of which fixture is the highest. If the
roller 54 is highest the load is transmitted directly from the
roller fixture 48 to the upper end of the sleeve screw. If the head
62 is the highest, the load is transmitted by the head fixture 56
through the winged nut 58, to the sleeve screw 42 and nut 38.
With the present invention the relative installtion heights of the
respective supports 24 are not critically significant regarding
variations in heights between respective sets of mounting bolts 22
since the roller and head assembly units can be leveled easily
throughout the building area by a crank or power wrench (not shown)
engaging the hex headed lower ends 30 of the sleeve screws and
adjusted, if need be, to transit sightings. Thereby all fixture
units can be leveled not only for pouring the concrete floor slab
but also for formwork roll out.
The formwork is generally lowered intact onto screw assemblies that
have been inspected and adjusted to a desired gross level. However,
there are occasions while supporting formwork beams that a screw
assembly has to be serviced, or replaced, and then readjusted. For
these occasions a modification 62A (FIG. 7) of the head 62
comprises locating pins 64A at the corners of the head 62A. And,
depending on the direction of rotation of the screw 42 that raises
them, preferably at least one of these pins 64AT is higher than the
other by as much as one half of the lead of the thread 41 on a
trailing corner. Thereby the head 62A and roller 54 are disposed
properly under and in alignment with the beam since the higher
trailing pins or pins 64AT are first to engage the leading side or
sides of the beam as the head rises in a helical path 66 when
rotating with the screw that is being advanced by its turning
during height readjustment.
In use, once the forms are removed from poured concrete columns 10
exposing the vertically spaced tubes 28 embedded in them, the
support 24 for each column is easily lifted and one bolt 22 is
inserted and its nut 26 is partially tightened, preferably the
upper one, and the support 24 and its tube 32 are temporarily
tilted to extend horizontally. In this position the sleeve screws
42 with the two nuts 38 and 58 on them can be easily inserted in
the tube 32. The support 24 and its tubes 32 are then oriented
vertically and the other bolts 22 attached and both nuts 38
tightened. Thereafter the head fixtures 56 and roller fixtures 48
are dropped into their working positions in that order, or as
units, on the upper end of the screw 42 with the heads 62 slightly
higher than the rollers 54. The heads 62 can later be brought to a
predetermined level by turning the sleeve screw 42 by its hex head
30 from below the support 20 to align the heads 56. The formwork
beams 16 can then be placed on the heads 62 and the final height
and leveling made by screw adjustment with the formwork in place
for pouring.
After the concrete slab 14 is poured and hardens sufficiently, the
sleeve screws 42 are progressively retracted downwardly as turned
from below until the formwork 12 drops free of the slab, and, is
low enough to roll out. Thereupon, the winged nuts 58 are retracted
to expose the roller fixtures 48 to contact with the formwork beams
16 and with the pins 64 engaging the sides of the beams, the
rollers 54 are held oriented in the roll out direction.
After roll out, the reverse order of assembly steps is taken. Parts
can be inspected, repaired or replaced, cleaned and oiled for
repeated use on slabs for floors above.
In event any contractor desires for any reason to handle the jack
screw assembly and support as a bracket, the nut 38 need only be
spot welded by hin to the upper end of the tube 26 and the sleeve
screw is threadedly attached thereto but the many advantages and
versatility is impaired.
Screws are generally the only parts that become damaged in use and
may require attention that cannot be given while mounted in place,
and heretofore the whole assembly generally has had to be removed
because damage has occurred at its upper end. With the present
invention, both bolts may be loosened and one removed. The support
is then tilted to drop out the damaged screw assembly and replace
it with another one and the support again quickly tilted back,
tightened in place and the fixtures adjusted as to their
appropriate heights.
* * * * *