Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Threaded fastener locked to a discreet structure – Fastener – or coaxial adjunct therefor – having sidewardly...
Reexamination Certificate
2001-02-23
2002-10-29
Saether, Flemming (Department: 3679)
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Threaded fastener locked to a discreet structure
Fastener, or coaxial adjunct therefor, having sidewardly...
C411S410000
Reexamination Certificate
active
06471457
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to screw retention devices, and more particularly to a screw retention device having a clamping part for securely gripping a screw and a hook part for retaining the position of the screw.
BACKGROUND OF THE INVENTION
When using a fastener, such as a screw, there is a risk that vibrations, or other conditions, will cause the screw to shift in position, loosen and, in some cases, fall out. To prevent the screw from shifting or falling out, numerous screw retention devices and methods have been developed. As shown in
FIG. 9
, a known device
100
is disclosed for preventing fall out. The device
100
includes a wiring mechanism
102
that is used to wire a pair of tightened screw heads
104
,
106
together.
Another known device
120
is shown in
FIGS. 10A-10C
. The known device
120
includes a tightening plate
122
, best shown in
FIG. 10A
, having a pair of holes
124
dimensioned to receive screws
126
. The screws
126
, as best shown in
FIG. 10B
, have a triangular head portion
128
and a threaded shaft
130
. To install the tightening plate
122
, the screw shaft
130
is positioned through a hole
124
of the tightening plate
122
prior to being threadingly engaged with another object. As shown in
FIG. 10C
, each tightening plate
122
receives two screws
126
. When the screws are fastened, the edge
132
of the tightening plate
122
is bent in the direction designated as X, shown in
FIG. 10C
, to fit the shape of the screw. When the edges
132
are bent around the screw
126
, the bent edges prevent the triangular head
128
from rotating. Thus, the screw
126
is maintained in position.
The known methods of retaining screws in a static position are complicated and time consuming. Accordingly, there is a need for a simplified method and device to retain screws in a static position.
SUMMARY OF THE PREFERRED EMBODIMENTS
A screw retention device is disclosed having a clamping part and a hook part. The clamping part engages the head of a screw for securely retaining the screw. The hook part interacts with a surface of the component on which the screw is fastened to limit the rotation of the screw. The screw retention device is configured to be used with any known screw having a protruding head. In a preferred embodiment of the invention, the screw retention device is used with a serrated screw wherein the clamping part of the screw retention device includes a serrated portion which corresponds to and engages with the serrations on the serrated screw to securely grip the screw.
The serrated screw preferably includes an upper head portion and a lower head portion, wherein the upper head portion has a larger diameter than the lower head portion and wherein the lower head portion carries the serrations. When the screw retention device is installed on the serrated screw, the serrated surface of the clamping part engages the serrations on the lower head portion of the screw. The upper head portion limits the movement of the screw retention device in an upward direction.
Other objects, features and advantages of the present invention will become apparent to those skilled in the art from the following detailed description. It is to be understood, however, that the detailed description and specific examples, while indicating preferred embodiments of the present invention, are given by way of illustration and not limitation. Many changes and modifications within the scope of the present invention may be made without departing from the spirit thereof, and the invention includes all such modifications.
REFERENCES:
patent: 539692 (1895-05-01), Lister
patent: 969543 (1910-09-01), Lance
patent: 1026812 (1912-05-01), Lance
patent: 1151632 (1915-08-01), Wall
patent: 1367985 (1921-02-01), Nainka
patent: 1871684 (1932-08-01), Gibbons
patent: 2370944 (1945-03-01), Emerson
patent: 2880637 (1959-04-01), Koenig
patent: 2955690 (1960-10-01), Bedford
patent: 3031049 (1962-04-01), Somville
patent: 4906150 (1990-03-01), Bennett
patent: 5954466 (1999-09-01), Coffey
patent: 93 14026 (1993-11-01), None
patent: 339051 (1930-12-01), None
patent: 910446 (1960-01-01), None
Jeffer Mangels Butler & Marmaro LLP
Saether Flemming
Shimano Inc.
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