Static structures (e.g. – buildings) – Assembled in situ-type anchor or tie – Depending cantilevered seat portion; e.g. – joist anchor
Reexamination Certificate
1998-10-13
2001-05-15
Callo, Laura A. (Department: 3635)
Static structures (e.g., buildings)
Assembled in situ-type anchor or tie
Depending cantilevered seat portion; e.g., joist anchor
C052S712000, C052S656900, C052S289000, C403S231000, C403S232100
Reexamination Certificate
active
06230466
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a connector used in building construction, and in particular to a structural hanger for suspending a held framing member from a holding framing member in a building.
Hangers typically have a stirrup-shaped portion for receiving an end portion of a held framing member, such as a joist, a top flange for connecting the hanger to the support or holding member, such as a truss or a purling, and a back member that connects the stirrup portion to the top flange.
The stirrup portion generally comprises a seat member which the held framing member rests upon, and first and second opposite side members that stabilize the held framing member. The first and second opposite side members receive the end portion of the held framing member between them. The first and second opposite side members are generally formed with a plurality of openings for allowing the hanger to be nailed or otherwise attached to the held framing member. This further stabilizes the held framing member and provides uplift resistance. For an example of a hanger with a rather unique stirrup portion see U.S. Pat. No. 4,890,436, granted to Karen W. Colonias for a Multiple Wood Truss Connection.
The stirrup portion of the typical hanger is not the only means for supporting the held member taught by the prior art. For example, some hangers eliminate the seat member. They support the held framing member by means of fasteners or bolts received by one or more side member. In these situations the bolts or fasteners provide both bearing support and uplift resistance to the held framing member. For an example of such a hanger see U.S. Pat. No. 4,893,961 granted to Kevin B. O'Sullivan and Arthur L. Troutner for a Joist Hanger.
Still other hangers vary from the typical hanger form by eliminating the top flange which connects the hanger to the holding member. See U.S. Pat. No. 4,717,279 granted to Alfred D. Commins on Jan. 5, 1988 for a Bucket Hanger. This is especially true of hangers designed for connecting two plated trusses together. See, for example, U.S. Pat. No. 5,341,619 granted to Brian D. Dunagan and Alfred D. Commins on Aug. 30, 1994 for a Truss Girder Hanger Connection, and U.S. Pat. No. 4,890,436 granted to Karen W. Colonias on Jan. 2, 1990 for a Multiple Wood Truss Connection. These hangers are generally attached to the vertical web member of the carrying truss near the bottom of the truss. Because of their location near the bottom of the vertical web member, an elongated back member would be required to provide a top flange that could hook over the top of the carrying truss.
The hanger of the present invention differs from the prior art by providing an improvement to the connection between the hanger and the carrying or holding member. The hanger of the present invention differs from the prior art, first, by providing a connection flange that does not wrap over the top of the carrying or holding member, and, second, by allowing the fasteners that make the connection to the holding member to be in double shear with the hanger.
When the carrying member is composed of multiple plies, such as in various nail-plate trusses, and the double-shear configuration is used, the present invention provides improved distribution of the load to the plies in the carrying member. This is because the hanger introduces the load to the fasteners inserted through the carrying member from two sides of the carrying member. This uniform distribution of the load makes it easier to design multiple-ply trusses so that the plies act as one member.
SUMMARY OF THE INVENTION
It is the object of the present invention to provide an improved hanger for connecting a held member to a holding member.
The present invention provides an improved connection between a held member and a holding member by having a unique connection flange that allows the hanger to be used in situations where a top flange cannot be used to connect the hanger to the holding member.
The present invention also provides an improved connection between the hanger and the holding member by creating a pair of opposed portions, both of which receive the fasteners that connect the hanger to the holding member.
The hanger of the present invention has a connection member for holding the held member, a back member, and a unique connection flange which is used to strengthen the connection of the hanger to the holding member. The connection flange can either wrap around or under the holding member. In the preferred embodiment, the connection flange wraps around the holding member to the side opposite the back member of the hanger.
This allows each of the fasteners that connect the hanger to the holding member to be received by the hanger at two points, which better distributes the load throughout the holding member.
The hanger of the present invention can be made as a single member. It can also be made with the connection flange formed as a separate “c”-shaped member that attaches to the combined back and connection members. A “c”-shaped connection flange can also be added to the single member embodiment or as an additional connection flange to the embodiment where the first connection flange is already a “c”-shaped member.
It is also to be noted that the hanger of the present invention can be used with a variety of structural members. For example, it can be used with standard dimension lumber, engineered lumber, plated wood trusses, truss girders, metal framing members, and engineered metal trusses to name a few examples.
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Maher, Arthur, “Engineered Nailing Simplifies Framing”, Popular Mechanics, pp. 137-140, Aug. 1964.
Callo Laura A.
Cypher Charles R.
Cypher James R.
Simpson Strong-Tie Company Inc.
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