US3785291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for closing off defective heat exchanger tubes
Assignee: Siemens AG
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Filing: 1972-05-16
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Granted: 1974-01-15
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Expires: 1992-05-16
Abstract
Abstract The device for closing off a defective heat exchanger tube includes a metallic plug having a blind hole in which a sleeve of plastic, cardboard or the like is mounted. The plug has a cylindrical cross-section at the forward end to fit in the tube and a conically tapered outer surface at the open end. The sleeve encloses an explosive charge within the plane of the conically tapered outer surface of the plug and is provided with an enlarged end portion which projects from the plug. This end portion is conically tapered and slotted to jam in the heat exchanger tube. Upon detonation, the explosive charge expands and welds the conically tapered surface portion of the plug to the heat exchanger tube to close off the end of the tube.
Inventors
- 👤 G Seyd
- 👤 A Bergbauer
- 👤 M Ploger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:47
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/06; B23K20/08; B23K20/085; F; F28; F28F; F28F11/00; F28F11/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49352; Y10T29/49805; Y10T29/49806
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
153 words
A device for closing off an end of a tube comprising a metallic plug having a forward peripheral surface portion of cylindrical cross-section, a conically tapered rear surface portion of predetermined angle and a blind hole extending from a rear end thereof into the plane of said forward surface portion; a sleeve having a forward end positioned in said blind hole and an enlarged rear end projecting away from said rear end of said plug, said enlarged end having a cone-shaped outer surface and a plurality of slots therein for jamming into the end of a tube to mount said plug in the tube; a detonator cap within said forward end of said sleeve; and an explosive charge of predetermined detonation velocity within said sleeve and within the plane of said conically tapered rear surface portion of said plug, said charge being of the same length as said conically tapered rear surface portion.
Claim 2
Independent Claim
153 words
A device for closing off an end of a tube comprising a metallic plug having a forward peripheral surface portion of cylindrical cross-section, a conically tapered rear surface portion of predetermined angle and a blind hole extending from a rear end thereof into the plane of said forward surface portion; a sleeve having a forward end positioned in said blind hole and an enlarged rear end projecting away from said rear end of said plug, said enlarged end having a cone-shaped outer surface and a plurality of slots therein for jamming into the end of a tube to mount said plug in the tube; a detonator cap within said forward end of said sleeve; and an explosive charge of predetermined detonation velocity within said sleeve and within the plane of said conically tapered rear surface portion of said plug, said charge being of the same length as said conically tapered rear surface portion.
Claim 3
Dependent Claim
38 words
A device as set forth in claim 1 wherein said sleeve includes a slot therein and which further includes ignition wires connected to said detonator cap and extending through said slot of said sleeve out of said sleeve.
Claim 4
Dependent Claim
45 words
A device as set forth in claim 1 wherein said angle of said conically tapering surface portion of said plug is matched to said detonation velocity of said explosive charge and to the material of said sleeve whereby said angle increases with increasing detonation velocity.
Claim 5
Dependent Claim
20 words
A device as set forth in claim 1 wherein said angle is at least 2* and not greater than 60*.
Claim 6
Dependent Claim
23 words
A device as set forth in claim 1 wherein said plug is of the same material as the tube to be closed off.
Claim 7
Dependent Claim
31 words
A device as set forth in claim 1 wherein said plug has a coefficient of thermal expansion equal to the coefficient of thermal expansion of the tube to be closed off.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |