Patent US3590877A successfully refreshed from Google Patents.
US3590877A
Expired / Lapsed
US
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Explosive-activated plug
Assignee: Babcock and Wilcox Co
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Filing: 1968-09-20
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Granted: 1971-07-06
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Expires: 1988-09-20
Abstract
Abstract A plug which can be inserted into a tube and containing a shaped explosive charge which is detonated to expand the plug against the surrounding tube surface with an impact that effects a circumferential weld bond between the plug and tube surface to seal the tube.
Inventors
- 👤 Phillip M Leopold
- 👤 Louis A Sturiale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:07
CPC Classifications
F; F28; F28F; F28F11/00; F28F11/02; B; B21; B21D; B21D39/00; B21D39/04; B21D39/042; F42; F42B; F42B3/00; F42B3/006; F42D; F42D3/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49805
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
167 words
An explosive-activated plug which comprises a generally cylindrical hollow metal body open at one end and closed at the opposite end and disposed for insertion into the bore of a metal tube to be sealed, a shaped explosive charge retained within said hollow body, said explosive charge having an explosive material distributed lengthwise within said body and including a cylindrical block of explosive material, a cylindrical sheet of explosive material positioned in contiguous adjoining relation to said cylindrical block, and a conical sheet of explosive material positioned in contiguous adjoining relation to said cylindrical block, and means disposed within said body and operable from a location outside thereof to detonate said explosive charge and thereby expand said body radially outward against the surrounding tube surface with an impact energy effecting a metallurgically bonded contact between said body and surface to seal the bore, said contact being over a zone extending completely around the circumference of the body and along an axial length portion thereof intermediate said ends.
Claim 2
Dependent Claim
167 words
An explosive-activated plug which comprises a generally cylindrical hollow metal body open at one end and closed at the opposite end and disposed for insertion into the bore of a metal tube to be sealed, a shaped explosive charge retained within said hollow body, said explosive charge having an explosive material distributed lengthwise within said body and including a cylindrical block of explosive material, a cylindrical sheet of explosive material positioned in contiguous adjoining relation to said cylindrical block, and a conical sheet of explosive material positioned in contiguous adjoining relation to said cylindrical block, and means disposed within said body and operable from a location outside thereof to detonate said explosive charge and thereby expand said body radially outward against the surrounding tube surface with an impact energy effecting a metallurgically bonded contact between said body and surface to seal the bore, said contact being over a zone extending completely around the circumference of the body and along an axial length portion thereof intermediate said ends.
Claim 3
Dependent Claim
23 words
An explosive-activated plug as defined in claim 1 wherein said detonator means is positioned for contact with said cylindrical block of explosive material.
Claim 4
Dependent Claim
48 words
An explosive-activated plug as defined in claim 1 wherein said hollow body has a cylindrical bore extending axially inward from said open end of the body, and a blind core communicating with said cylindrical bore and tapering with decreasing cross-sectional area toward said closed end of the body.
Claim 5
Dependent Claim
51 words
An explosive-activated plug as defined in claim 3 including filler means disposed within said body to support said cylindrical sheet of explosive material in contact with the surface of said cylindrical bore, and to support said conical sheet of explosive material in contact with the surface of said tapered blind bore.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |