Pipes and tubular conduits – With closures and plugs
Reexamination Certificate
2005-11-22
2005-11-22
Brinson, Patrick (Department: 3754)
Pipes and tubular conduits
With closures and plugs
C138S090000
Reexamination Certificate
active
06966342
ABSTRACT:
A sealing plug for blind installation in a suitable hole thereby to plug and seal the hole, which sealing plug comprises a sleeve (1) having one end closed, a stem (2) having a head (4) at least part of which is radially enlarged with respect to the remainder of the stem, the stem head being within the sleeve and the stem protruding from the open end of the sleeve by passing through a part of the sleeve which has an internal cross-sectional dimension less than that of the stem head, the stem head having a shoulder (8), and there being an abutment of sleeve material against at least the radially outer part of the shoulder, the stem head being of a material which is harder than that of the sleeve and being formed with a weakened portion at a position intermediate the head and the part of the stem remote therefrom, whereby, when the sealing plug is inserted in a suitable hole, with the sleeve entirely within the hole, and increasing tension force is applied to the stem with respect to the sleeve, axial compression is applied by the shoulder to engage with the hole, and thereafter the stem breaks at the weakened portion (3) so that the head remains within the sleeve.
REFERENCES:
patent: 3451583 (1969-06-01), Lee
patent: 3525365 (1970-08-01), Boyle et al.
patent: 4091841 (1978-05-01), Beneker et al.
patent: 5944057 (1999-08-01), Pierce
patent: 877193 (1998-11-01), None
patent: 1249517 (1971-10-01), None
patent: 2314904 (1998-01-01), None
patent: 2325039 (1998-11-01), None
Brinson Patrick
Textron Fastening Systems Limited
Trexler, Bushnell Giangiorgi, Blackstone & Marr, Ltd.
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