Static molds – Miscellaneous mold adjuncts – In situ construction engineering or building type
Reexamination Certificate
1999-09-17
2001-07-03
Safavi, Michael (Department: 3635)
Static molds
Miscellaneous mold adjuncts
In situ construction engineering or building type
C249S219200
Reexamination Certificate
active
06254056
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to concrete form brackets and more particularly, but not by way of limitation, to a bracket used for compressing a wood brace against the side of a concrete form plywood panel used in forming concrete walls and foundations.
2. Discussion of Prior Art
In U.S. Pat. Nos. 2,967,689, 3,235,217 and Des. 192,231 to Carl M. Jahn of Denver, Colo., a clamp bracket for concrete forms and a wedging detent for waler brackets are disclosed. These type of brackets are used for engaging tie-rods used in concrete form construction and securing 2×4 inch wood braces against the side of typically 4×8 foot plywood panels. The plywood panels used in forming concrete walls, foundations and like structures.
The subject inventor is a principal in Alfred Manufacturing Company, Denver, Colo. This company has been a manufacture of the above mentioned clamp brackets for years. These brackets are marketed nationwide for use in the building construction industry. The brackets are sold under a brand name of the “JAHN BRACKET”. The brackets are also referred to in the industry as the “A” bracket.
The new clamp/waler bracket is similar in structure and function when compared to the above mentioned Jahn clamp bracket but with substantial improvements and modifications which are described herein.
SUMMARY OF THE INVENTION
In view of the foregoing, it is a primary object of the subject invention to provide an improved clamp/waler bracket which is rugged in construction, simple in design and prevents bending and damage to the bracket when the bracket compresses a wood brace against the side of a plywood concrete form panel during a concrete pour. Bending and damage to prior art brackets occurred particularly when undersized 2×4 inch wood braces were used during the building of the concrete forms. The subject improved clamp/waler bracket eliminates this problem.
Another object of the clamp/waler bracket is by improving the simplicity of bracket design, the amount of material previously used in the construction of brackets of this types is reduced thereby reducing the cost of manufacture.
The clamp/waler bracket includes a vertical tie-rod connecting arm having an upper portion, a center portion and a lower portion. The connecting arm includes a hole therein for receiving the tiehead and a portion of the tie-rod therethrough. An eccentric handle with a cam and cam channel is pivotly attached to an upper portion of the connecting arm. The cam and cam channel are used for releasably engaging the tie-rod. A first end of an angle arm is integrally formed in the bottom portion of the connecting arm. The angle arm includes a reinforcing rib and gussets for added strength. The angle arm extends downwardly and at an angle in a range of 30 to 75 degrees from the vertical tie-rod connecting arm. A second end of the angle arm is integrally formed in a bottom portion of a vertical panel arm. The vertical panel arm is adapted for receipt next to the outside of the plywood panel. An upper portion of the vertical panel arm is bent outwardly at 90 degrees forming a brace ledge. A pair of brace tabs are formed in the center portion of the connecting arm and bent inwardly at 90 degrees. The brace ledge and the brace tabs are used for receiving a portion of the wood brace thereon. When the eccentric handle engages the tie-rod, the upper portion of the connecting arm compresses the wood brace against the plywood panel.
These and other objects of the present invention will become apparent to those familiar with the different types of concrete form clamp brackets and waler brackets when reviewing the following detailed description, showing novel construction, combination, and elements as herein described, and more particularly defined by the claims, it being understood that changes in the embodiments to the herein disclosed invention are meant to be included as coming within the scope of the claims, except insofar as they may be precluded by the prior art.
REFERENCES:
patent: 2967689 (1961-01-01), Jahn
patent: 3174203 (1965-03-01), Kemper
patent: 3216690 (1965-11-01), Jahn
patent: 3235217 (1966-02-01), Jahn
patent: 3462106 (1969-08-01), Buyken
Crabtree Edwin H.
Margolis Donald W.
Pizarro Ramon L.
Safavi Michael
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