Concrete form puller

Details Concrete form puller Concrete form puller

2002-11-13

2004-06-22

Watson, Robert C. (Department: 3723)

Implements or apparatus for applying pushing or pulling force

Single throw lever

Special engaging feature

Reexamination Certificate

active

06752382

ABSTRACT:

BACKGROUND OF THE INVENTION
In pouring cement, Forms are used to contain the fluid cement and to shape the cement into the configuration and dimensions desired for the particular purpose. Unlike job-built formwork which must be tailored for each specific pour, Steel-Ply Forming Systems have been devised (such as by Symons, a Dayton, Ohio Company) which come in a variety of standard sizes which can be combined to form virtually any dimension. Steel-Ply panels and fillers are made of special High Density Overlay (HDO) plywood or birch plywood mounted on rugged steel frames. They can be used up to 200 times before being replyed.
Symons' Steel-Ply panels and fillers are constructed from a rugged steel frame. The side rail of the form is rolled exclusively for Symons and has a minimum yield stress of 55,000 psi. Crossmembers have a minimum yield stress of 60,000 psi and are located at one foot centers on all panels and fillers.
Symons special ½″. High Density Overlay (HDO) or birch plywood provides a smooth finish. Each piece is edge sealed with polyurethane to repel moisture and prevent delamination. With proper care, contractors can expect up to 200 reuses before plywood replacement.
Steel-Ply requires little training because it has no top or bottom, left or right, and can be used vertically or horizontally. Dado slots at crossmembers simplify tie placement. Slots for hardware attachment are located between crossmembers.
All Steel-Ply components combine to provide a 1000 psf rated system with a predictable safety factor over the service life of the form.
Sizes—Symons' complete Steel-Ply system consists of 80 standard panel and filler sizes. Panel and filler heights range from 3′ to 8′, in 1′ increments. Panel widths are 24″ and filler widths range from 4″ to 22″, in 2″ increments. A 5″ wide filler and steel 1″, 1½″, and 2″ fillers are also available. Wedge Bolts connect panels, fillers and ties in one simple operation. Steel Fillers—Symons' Steel Fillers are cold-formed U-shaped steel. The 1″ and 1½″ steel fillers are punched with connecting slots at 6″ O.C. A Long Bolt passes through the steel filler to grip adjoining panel side rails.
The 2″ Steel Filler has connecting slots at 2″ O.C. It is used to “step” forms in 2″ increments. This steel filler reduces the need to build up under forms when step footings or changing wall elevations occur.
Connecting Hardware
Wedge Bolts
Two identical Wedge Bolts function as a lock-bolt set, one as a connecting bolt, the other as a clamping wedge. At typical siderail-to-siderail connections, the loop end of the tie is positioned in dado slots and is secured by the same Wedge Bolts.
For typical walls, form connecting Wedge Bolts are only required at standard tie connection positions. Additional Wedge Bolts are utilized at other positions for attachment of walers, scaffold brackets or other accessory components.
Long Bolts
The Long Bolt is designed to be used with the 1″, 1½″ and 2″ Steel Filler. The long connecting bolt is punched with tow ¼″ holes to accommodate a 16D nail to be used to shorten the bolt for Steel Fillers. A vertical Wedge Bolt secures the two panels and filler through the adjoining side rails.
Base Tie Bolts
The Base Tie Bolt secures a tie to an endrail or a siderail resting on a footing. It also can be used in situations where panels butt against an existing vertical surface.
SUMMARY OF THE INVENTION
It is an object of this invention to separate forming systems from the hardened and set concrete with a minimum of damage to the concrete or chipping of the concrete.
It is another object of this invention to accomplish the foregoing in a faster and easier manner than can be accomplished without using the concrete form puller of this invention.
It is another object of this invention to separate forming systems from set concrete with reduced physical force, and to reduce injuries such as wrenching one's back in straining to remove the form from the set concrete.
It is another object of this invention to accomplish the foregoing by the use of the puller device of this invention which can be easily and inexpensively manufactured.
Broader aspects of the invention and devices within the scope of same will become clear from a further reading of the specification and claims and a consideration of the drawings


REFERENCES:
patent: 1911287 (1933-05-01), Pladson
patent: 6302376 (2001-10-01), Williams

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