Prefabricated headers

Details Prefabricated headers Prefabricated headers

1999-10-29

2001-04-17

Chen, Jose V. (Department: 3636)

Static structures (e.g., buildings)

Framing to receive door, doorjamb, or window sash

C052S749100

Reexamination Certificate

active

06216400

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to a prefabricated header used in the construction industry. Headers are load bearing devices that are installed on the top of building openings. They may be used over openings for doors, windows or wherever there is a need to provide strength to support the wall, floor, roof and other structural elements above the opening.
For years headers have commonly been constructed by workmen on the job site. One widely used method has been to cut two 2 inch by 12 inch boards to the length required and then to nail the two boards together with a ½ inch chip board of the same length sandwiched between. The resulting load bearing header is a board 3.5 inches thick which is the normal thickness of the wall. Another reason 2 by 12 boards (actually 1.5 inches by 11.5 inches) are used to construct headers is that the 11.2 inch height when nailed flush to the top of an eight foot high wall gives a height opening suitable for a standard sized manufactured door.
Other prior art bulkheads or headers have metallic moldings with a series of sections whose edges are overlapped by an edge of an adjacent section with a retaining member between the edges. With one other prior art reference the header for a door frame is prefabricated with a horizontal lintel bar and vertically spaced strips joined by several short strips. Side bolts through the side strips are used to attach the lintel bar to the upper ends of stud sections.
Another prior art reference discloses a one piece light-gauge metal load-bearing header with a tube-shaped box beam. Still another prior art reference has a header with interlocking side end flanges, one of which is one each vertical studs, which sides end flanges can be joined together.
DESCRIPTION OF THE PRIOR ART
Load-bearing headers used in construction have been constructed in a vary of ways. For example, in the U.S. Pat. No. 1,891,187 to Plym there is disclosed a metallic moldings with a series of sections whose edges are overlapped by an edge of an adjacent section with a retaining member between the edges.
U.S. Pat. No. 2,316,425 to Hasenburger et al. discloses a header for a door frame which is prefabricated and has a horizontal lintel bar and vertically spaced strips joined by several short strips. Side bolts through the side strips are used to attach the lintel bar to the upper ends of stud sections.
U.S. Pat. No. 5,802,782 to Jewell discloses a one piece light-gauge metal load-bearing header with a tubeshaped box beam.
U.S. Pat. No. 5,689,922 to Daudet discloses a header with interlocking side end flanges, one of which is one each vertical studs, which sides end flanges can be joined together.
The present invention is a load-bearing prefabricated header having an outer frame with interior webbing material for strength and inserted chipboards all as will be detailed in the specification that follows hereafter.
SUMMARY OF THE INVENTION
This invention relates to prefabricated load-bearing headers used in the construction industry that use less lumber and material and are lighter in overall weight than conventional job site constructed headers.
It is the primary object of the present invention to provide for the improved construction of prefabricated headers.
Another object is to provide for such headers that are lighter and use less lumber than conventionally job site constructed headers yet have sufficient strength to bear the loads on them.
These and other objects and advantages of the present invention will become apparent to readers from a consideration of the ensuing description and the accompanying drawings.


REFERENCES:
patent: 1891187 (1932-12-01), Plym
patent: 2316425 (1943-04-01), Hasenburger et al.
patent: 2936051 (1960-05-01), Martin
patent: 3079649 (1963-03-01), Willatts
patent: 3103262 (1963-09-01), Handley
patent: 4336678 (1982-06-01), Peters
patent: 4843777 (1989-07-01), Shimabukuro
patent: 5074092 (1991-12-01), Norlander
patent: 5625996 (1997-05-01), Bechtel
patent: 5653080 (1997-08-01), Bergeron
patent: 5689922 (1997-11-01), Daudet
patent: 5802782 (1998-09-01), Jewell
patent: 5966894 (1999-10-01), Crump, Jr.
patent: 605065 (1926-05-01), None
patent: 120991 (1918-12-01), None
patent: 58440 (1946-05-01), None

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