Static molds – Miscellaneous mold adjuncts – In situ construction engineering or building type
Reexamination Certificate
1998-10-20
2001-02-27
Lillis, Eileen D. (Department: 3673)
Static molds
Miscellaneous mold adjuncts
In situ construction engineering or building type
C249S004000, C249S045000, C249S046000, C249S192000, C249S219200, C403S213000
Reexamination Certificate
active
06193210
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a fastening fitting with a reinforcing member-tightening portion. More specifically, the invention relates to a fastening fitting with a reinforcing member-tightening portion adapted to be used for concrete-molding frames and the like.
2. Prior Art
A U-shaped fastening fitting (prior art) called U-clip shown in
FIG. 6
has heretofore been widely used for the concrete-molding frames made of steel. This fastening fitting is convenient-for firmly supporting and fastening the required portions of the back surfaces of the molding frames, and is made of a rod of low carbon steel or medium carbon steel which is relatively cheaply available.
When a large concrete structure is to be constructed, in many cases, unit frames each having a unit weight of about 10 to 30 kilograms are used to be connected in many portions. In this case, the combined frames as a whole tend to lose the strength. In many cases, therefore, several to several tens of a pair of reinforcing members such as steel pipes are arranged in parallel cross on back surfaces of the frames.
The molding frames made of steel are generally assembled and secured together roughly in two ways depending upon the methods of tightening the molding frames and the reinforcing members. Here, however, the molding frame-fastening fitting and the fastening method are the same.
A first method is a widely employed method of executing the work according to which the surface plate of the molding frame is not perforated, and a plate-like separator is sandwiched by two pieces of molding frames by utilizing holes A perforated in the molding frames and is secured by the fittings penetrating therethrough. In this case, the reinforcing members are tightened by inserting a tightening fitting in a hole B separately perforated near the hole A in the frames. This method, however, has a demerit in that the reinforcing members are not tightened on a coaxial extension of the separator due to its structure.
According to a second method, holes C are formed in the surface plates of the molding frames, the ends of a rod-like separator are inserted in the holes C, C of the two surface plates, rod-like metallic fastening fittings are screwed into the threaded ends of the separator from the outer sides of the surface plates, thereby to fasten the reinforcing members. This method has a merit in that the reinforcing members can be tightened on a coaxial extension of the separator. However, since holes are formed in the surface plates, undesired ruggedness is formed after the concrete has been solidified, impairing smoothness on the finished surface and shortening the life (number of times of repetitive use) of the steel molding frames.
Besides, the conventional fastening fitting for steel molding frames requires a separate fitting for tightening the reinforcing members, involving difficulty in tightening to the reinforcing members. In particular, in high places and in narrow places where the scaffolding is not safe enough, three kinds of parts must be used, i.e., U-shaped fastening fitting, straight rod-like tightening fitting and tightening washer for securing the reinforcing members to the steel molding frames by using a separate tightening fitting, requiring laborious work for correctly positioning these parts and causing the work to become very difficult.
Besides, when a conventional fitting (metal tie) of the twisted type
201
(see
FIG. 7
) for tightening the reinforcing materials is inserted in the through holes of the frames
40
,
40
that are vertically erected as shown in
FIG. 8
, one side which is longer tends to be lowered due to gravity, hindering the work.
SUMMARY OF THE INVENTION
The present inventors have discovered the fact that the above-mentioned problems can be solved at one time by adding a reinforcing member-tightening portion to a portion of the conventional fastening fitting as a unitary structure, and have arrived at the present invention through contrivance and trial.
That is, the present inventors have added a reinforcing member-tightening portion to the fastening fitting relying basically upon the first method, so that the reinforcing members can be tightened on an extension of the separator.
The object of the present invention is to provide a fastening fitting with a reinforcing member-tightening portion formed as a unitary structure, that contributes to improving working efficiency on a dangerous and narrow working site, yet offering increased strength for the combined molding frames.
Another object of the present invention is to provide a fastening fitting with a reinforcing member-tightening portion which is easy to handle having a decreased number of parts compared with that of the prior art.
In order to accomplish the above-mentioned objects, the present invention provides a fastening fitting with a reinforcing member-tightening portion comprising:
a U-shaped fastening portion
5
with a narrow mouth;
a linearly extending portion
11
that is extending nearly horizontally from the U-shaped engaging portion
5
with a narrow mouth being bent by an angle &agr; of 80 to 130 degrees from a plane
6
inclusive of a U-shaped plane
5
A;
a reinforcing member-tightening portion
15
which rises from the linearly extending portion
11
at an angle &bgr; of 85 to 110 degrees; and
a horizontally protruding portion
20
that protrudes nearly in parallel with the U-shaped plane
5
A from the root of said reinforcing member-tightening portion
15
(first aspect).
The invention further provides a fastening fitting with a reinforcing member-tightening portion of first aspect, wherein an end
15
A of said reinforcing member-tightening portion
15
is in the form of a threaded bolt (second aspect).
The invention further provides a fastening fitting with a reinforcing member-tightening portion of first aspect, wherein an end
15
B of said reinforcing member-tightening portion
15
has elongated holes
17
for inserting a wedge (third aspect).
The invention provides a fastening fitting with a reinforcing member-tightening portion of the first aspect, which is used in combination with a separator having plate-like ends on both sides thereof, wherein in a junction portion of a pair of molding frames that are crossing, and engaging with, said separator at an angle of 0 to 50 degrees relative to the lengthwise direction thereof, the plate-like ends of said separator are held between said molding frames, said horizontally protruding portion
20
is inserted in the holes formed in the one frame, in the plate-like end and in the other frame so as to be turned about the axis thereof, and the frames are fastened together by the U-shaped fastening portion
5
(fourth aspect).
The invention further provides a fastening fitting with a reinforcing member-tightening portion of the fourth aspect, wherein said separator is of the form of a straight rod, a flat plate or has a U-shape in cross section (fifth aspect).
REFERENCES:
patent: 614957 (1898-11-01), Journeay
patent: 3584827 (1971-06-01), Shoemaker
patent: 4194717 (1980-03-01), Easton et al.
patent: 4228986 (1980-10-01), Schimmel et al.
patent: 4307837 (1981-12-01), Leingang
patent: 4401291 (1983-08-01), Gallis
patent: 4435102 (1984-03-01), Smith
patent: 4480358 (1984-11-01), Barling et al.
patent: 4993879 (1991-02-01), Hilfiker
patent: 5522579 (1996-06-01), Rock
patent: 5562845 (1996-10-01), Miller et al.
patent: 5584854 (1996-12-01), Minarik
patent: 5802795 (1998-09-01), Myers et al.
Kanesaka & Takeuchi
Lee Jong-Suk
Lillis Eileen D.
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