Static structures (e.g. – buildings) – Openwork; e.g. – truss – trellis – grille – screen – frame – or... – Outside corner or peripherally bordered
Reexamination Certificate
2001-01-22
2002-06-18
Friedman, Carl D. (Department: 3635)
Static structures (e.g., buildings)
Openwork; e.g., truss, trellis, grille, screen, frame, or...
Outside corner or peripherally bordered
C052S204100, C052S656700, C049S504000
Reexamination Certificate
active
06405506
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates generally to door frames and more particularly to pre-hung doors and frames for metal buildings.
Referring to
FIGS. 1-3
, a pre-engineered metal building wall
100
is shown with a doorway opening
102
cut therein. In many applications, a door frame
104
is positioned within the opening
102
and secured to the building wall
100
by a door post
106
secured to each door jamb
108
. A girt
112
typically is provided above the upper edge of the opening
102
for securing of the posts
106
for additional rigidity. However, since the girt
112
is typically positioned above the frame height and the posts
106
are typically only the height of the frame
104
, long anchors
114
, which often are susceptible to flexing, are required to secure the posts
106
to the girt
112
. Additionally, a header reinforcement
116
may have to be secured to the frame header
110
for additional support.
In many pre-engineered metal buildings, door frames
104
are assembled at the job site by installing the frame sections and then hanging the door. Such installations are labor intensive and the resulting door and door frames can have insufficient resistance to twisting of the frames. Even in applications wherein the frame
104
is preassembled, the frames
104
still generally include a number of post-manufacture clips and anchors
118
for assembling the frame
104
and securing it to the door posts
106
. As a result, the manufacturing time and costs are increased and the resultant number of components also create more difficult assembly and greater risk of component failure. Additionally, the numerous clips and anchors
118
and the door posts
106
often make it difficult to easily and efficiently insulate the door jambs
108
.
The foregoing illustrates limitations known to exist in present door frames
104
for pre-engineered buildings. Thus, it is apparent that it would be advantageous to provide an alternative directed to overcoming one or more of the limitations set forth above. Accordingly, a suitable alternative is provided including features more fully disclosed hereinafter.
SUMMARY OF THE INVENTION
In one aspect of the present invention, this is accomplished by providing a pre-hung door and frame comprising: a header; two door jambs at a right angle to the header, each door jamb comprising an elongated member having a soffit, two stops extending at right angles from the soffit, a rabbet extending at a right angle from each stop and a face extending at a right angle from each rabbet, an upper end of each door jamb being attached to the header; and a door hingedly attached to one of the door jambs; and two door posts, the door posts nesting within and secured to the door jambs.
The foregoing and other aspects will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawing figures.
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Friedman Carl D.
Glessner Brian E.
Ingersoll-Rand Company
Michael & Best & Friedrich LLP
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