Static molds – Including destructible feature
Reexamination Certificate
2002-09-09
2004-09-14
Davis, Robert (Department: 1722)
Static molds
Including destructible feature
C249S094000, C249S096000, C249S205000, C052S699000, C052S705000, C411S082000, C411S397000
Reexamination Certificate
active
06789776
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to attachment elements for a cast tank, conduit or vessel, more particularly to an attachment apparatus for casting an internally threaded anchor in the wall of the tank, conduit or vessel.
In the ensuing description of the invention, the meaning of the term “vessel” includes and is not limited to tank, vessel and conduit.
The internally threaded anchor is preferably installed so that it is open to the inside of the vessel, but can be installed so that it is open toward the outside of the vessel.
2. Description of the Prior Art
In
FIGS. 1-3
, PRIOR ART attachment apparatus
100
includes solid plastic stud
104
and internally threaded anchor
108
. Base
114
of stud
104
screws into opening
106
of anchor
108
until washer
112
seats against annular face
102
. Pin
110
is inserted into a wall of the mold and concrete is poured into the mold. The concrete surrounds anchor
108
and hardens. When the concrete vessel is withdrawn from the mold, stud
104
breaks at annular groove
118
. Pin
110
remains in the mold wall, and anchor
108
containing threaded base
114
and washer
112
remains in the concrete wall. It is difficult to install stud
104
in anchor
108
when wearing work gloves, or, if the threads are contaminated with worksite dust. It is difficult to remove the remains of stud
104
from the vessel and from the mold wall without drilling the stud and the pin.
U.S. Pat. No. 3,557,274 patented Jan. 19, 1971 by E. L. Kowell describes a smooth rod bolted to a wall of a concrete mold form for a railroad tie, so that the rod extends into the form. An internally smooth, externally threaded, plastic sleeve that is closed at one end is mounted on the rod. An internally threaded anchor is screwed onto the plastic sleeve. Concrete is poured into the form and allowed to harden. The mold with post is slipped off the concrete tie withdrawing the post from the plastic sleeve. The sleeve is then screwed out of the anchor.
SUMMARY OF THE INVENTION
It is one object of the invention to provide an attachment apparatus for a molded wall in which a molding seal portion of the apparatus can be mounted in an anchor portion by a simple tool
It is one object of the invention to provide an attachment apparatus for a molded wall in which a molding seal portion of the apparatus can be easily removed from the apparatus after molding.
It is another object that a remnant of the seal portion can be easily removed form the mold wall after molding.
An apparatus for casting an internally threaded anchor in a mold having a mold wall, includes an anchor having an internally threaded first opening, a body a first end on the body threaded to fit the first opening, a second end on the body, configured to fit an opening in the wall of the mold for extending a first length of the body into the wall, a second opening in the second end extending toward the first end, and a protrusion in the second opening configured for receiving a tool for transferring rotational force about an axis through the first end and the second end for withdrawing the body from the anchor. Preferably the protrusion is recessed the first length from the second end. An annular member extends radially from the body, one axial end of the protrusion is at the axial position of the annular member.
REFERENCES:
patent: 2096062 (1937-10-01), Phillips
patent: 3355534 (1967-11-01), Groff
patent: 3418781 (1968-12-01), Penote
patent: 3557274 (1971-01-01), Kowell
patent: 3685782 (1972-08-01), Kowell
patent: 3685783 (1972-08-01), Nilson
patent: 3764066 (1973-10-01), Kowell
patent: 3982363 (1976-09-01), Dorris
patent: 4023257 (1977-05-01), Wright et al.
patent: 4083162 (1978-04-01), Regan et al.
patent: 4143193 (1979-03-01), Rees
patent: 4725859 (1988-02-01), Shibata et al.
patent: 5126095 (1992-06-01), Crosno et al.
patent: 5186883 (1993-02-01), Beall, III
patent: 3347665 (1985-07-01), None
patent: 2107753 (1983-05-01), None
Davis Robert
Heckenberg Donald
Seemann Robert A.
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