Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Threaded fastener locked to a discreet structure – Nut – and means to engage substructure on its opposite faces...
Reexamination Certificate
2000-12-04
2002-09-03
Saether, Flemming (Department: 3627)
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Threaded fastener locked to a discreet structure
Nut, and means to engage substructure on its opposite faces...
C411S371100
Reexamination Certificate
active
06443678
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a synthetic resin grommet used, for example, when parts for an automobile or parts for a home electric appliance (hereinafter simply referred to as parts) are attached to a body of the car or of the appliance (hereinafter simply referred to as body), respectively.
A synthetic resin grommet as shown in
FIG. 4
is widely used for attaching parts to the body
26
using bolts. The grommet has a cylindrical body
21
, a flange portion
22
arranged at a predetermined position of the cylindrical body
21
and stopping claws
24
whose tips face the flange portion. However, the conventional grommet has no sealing mechanism between a bearing face
25
a
of a tapping screw
25
to be inserted to the cavity of the grommet to fasten it and a head portion
23
of the grommet to be come into contact with the bearing face
25
a
when the tapping screw is fully fastened, nor between the lower surface of the flange portion
22
and the tips of the stopping claws
24
, so that it is in danger of entrance of water into the grommet and/or body through these portions. Therefore, entrance of water has been prevented by applying a grommet whose cylindrical body has a closed bottom
28
to the body
26
and by fitting a sealing annulus
27
such as of sponge rubber between the upper surface of the body
26
and the lower surface of the flange portion
22
when the grommet is applied to the body. However, the above contrivances still involve problems that to fit the sealing annulus
27
imposes an extra operation on an operator, and to form a grommet having a main body with a closed bottom impairs moldability of the grommet, preventing providing of grommets inexpensively.
SUMMARY OF THE INVENTION
The present invention is directed to solving the problems inherent in the prior art by contriving the configuration of the grommet and providing an inexpensive synthetic resin grommet which can prevent accurately and securely entrance of water into the grommet and/or body with no extra imposition on an operator.
More specifically, the synthetic resin grommet according to the present invention has a flange portion formed at a predetermined position of a cylindrical body and stopping claws arranged on the outer circumference of the cylindrical body such that their tips face the flange portion, characterized in that the grommet has an annular rib arranged at a top of a head portion of the cylindrical body. Further, the rim portion of the flange portion is preferably formed to have a thin vane-like shape, because sealing between the body and the flange portion can be achieved more accurately and securely. Here, the cylindrical body is preferably designed to have an open bottom, because this improves moldability of the grommet.
Other aspects and advantages of the invention will become apparent from the following description, taken in conjunction with the accompanying drawings illustrated by way of examples the principles of the invention.
REFERENCES:
patent: 3313083 (1967-04-01), Flora
patent: 3534797 (1970-10-01), Reinhard
patent: 4601621 (1986-07-01), Permoda
patent: 5217337 (1993-06-01), Junemann
patent: 5540528 (1996-07-01), Schmidt
patent: 6213700 (2001-04-01), Everard
Ito Hisashi
Mizuno Hiromichi
Aoyama Seisakusho Co., Ltd.
Frishauf Holtz Goodman & Chick P.C.
Saether Flemming
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