Static structures (e.g. – buildings) – Assembled in situ-type anchor or tie
Reexamination Certificate
2000-03-15
2001-06-05
Chilcot, Richard (Department: 2167)
Static structures (e.g., buildings)
Assembled in situ-type anchor or tie
C082S063000, C082S063000
Reexamination Certificate
active
06240697
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to improvements in anchors for poured concrete metal deck and wood framed floors in multi-story buildings, and more particularly pertains to new and improved threaded anchors that are inserted into the poured concrete metal deck or wood framed floors prior to pouring of the concrete so that when the concrete is set, these anchors may be used as support points for suspended utilities such as plumbing, mechanical piping, mechanical equipment, cable trays, bus ducts, HVAC ducts, electrical conduit, conduit racks, junction boxes and panels for example.
2. Description of Prior Art
In the field of anchors for concrete wood form and concrete metal deck floors, it has been the practice to utilize a threaded stud with a plate attached to its body, or an elongated nut with a bolt threaded into one end with a plate attached to its body to provide suspension points for support rods that suspend the utilities and utility racks that traditionally hang from the ceiling, which is the poured concrete floor of the floor above.
FIG. 1
illustrates a prior art anchor
11
which consists of threaded bar stock or a stud
15
bent at a right angle having an elongated plate
13
with apertures
17
at each end fastened to it. The threaded anchor
11
is placed into an aperture
18
drilled into a metal deck
21
which may have a general corrugated shape as illustrated in FIG.
2
. The right angle bend of the threaded stud
15
is on top. The other end of stud
15
is inserted through the aperture
18
with a nut
19
threaded onto that end to pull the elongated plate
13
tight against the metal deck
21
. Once the installation of all the anchors
11
is complete on the floor of a building, concrete
23
is poured over the metal deck
21
, to the required thickness, holding the threaded stud
15
in place. The threaded end of steel
15
descending through the floor
21
is actually descending from the ceiling of the floor above. Suspended utility structures are attached to this end of the stud
15
.
FIG. 3
illustrates an alternate prior art embodiment of an anchor for poured concrete metal deck or wood frame floor. This alternate prior art anchor
25
comprises a bolt
27
having a nut
33
threaded thereon. The portion of the bolt below nut
33
passes through an aperture in a plate
29
having a pair of fastening holes
31
on opposite ends thereof. The threaded end portion of the bolt
27
which passes through the aperture in the plate
29
has an elongated nut
35
threaded on to it. The other end
37
of the elongated nut
35
is left open for reception of a threaded support shaft. This type of prior art threaded anchor provides for ready attachment of a threaded shaft thereto. Whereas, the anchor of
FIGS. 1 and 2
require the further use of a female coupler nut on threaded shaft
15
, if a threaded support shaft were to be attached to it. In both cases, the size of the support shaft that may be used is determined by the anchor inserted into the floor prior to the pour.
The size of the support rods utilized will vary as dictated by load requirements depending upon the kind of utilities that are being suspended. Thus, once the prior art anchors are in place, the size of the suspension rods cannot be changed. Moreover, these prior art threaded anchors require a considerable amount of labor per device to install. These problems are overcome by the threaded anchors of the present invention.
SUMMARY OF THE INVENTION
Two embodiments of the internally threaded concrete insert anchor invention are disclosed, one designed for use with steel deck poured concrete floors, and one designed for wood form poured concrete floors. The internally threaded anchor for steel deck poured concrete floors is designed to snap-fit into holes drilled or punched into the steel deck. The anchor has a head with a shaft attached which is internally threaded at two different diameters to selectively accept two different size threaded support rods. A large washer or plate rides on the shaft and is separated from the head by a spring. A plastic or metal tube with a set of expanded plastic fingers is attached to the shaft on the other side of the plate. The threaded anchor is inserted into the hole in the deck with its head up causing the fingers to fold allowing the shaft to pass through the hole up to the plate which is being pushed down the shaft by the spring. The threaded anchor is held upright in the hole of the steel deck by the expanded fingers on one side of the deck and the plate against the other side of the deck, being squeezed together by the spring. The plastic or metal tube secures the underside of the threaded insert anchor prior to the concrete pour and provides thread protection from debris and proper rod guidance and alignment after the concrete has been applied.
The threaded anchor for wood form poured concrete floors has a head attached to a shaft that is internally threaded for two different size threaded studs. A plastic plate is attached to the outside of the shaft. The plate carries a plurality of bosses, each boss holding a nail aligned with the head and shaft of the threaded anchor. The threaded anchor is nailed into the wood form floor prior to the concrete pour.
REFERENCES:
patent: 991517 (1911-05-01), Kennedy
patent: 2687788 (1954-08-01), Rapp
patent: 2689987 (1954-09-01), Berger
patent: 3405497 (1968-10-01), McNair
patent: 4945704 (1990-08-01), Brown, Jr.
patent: 5568711 (1996-10-01), Popp et al.
patent: 5628161 (1997-05-01), Giannuzzi et al.
Thompson William J.
Watkins Keith L.
Chilcot Richard
Price and Gess
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