§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US3247591A Expired / Lapsed US ⏱️ 0.0 years remaining

Closure of pipes

Assignee: L ESERCIZIO DELL ISTITUTO SPER
•
Filing: 1962-05-18
•
Granted: 1966-04-26
•
Expires: 1982-05-18
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract 947,558. Welding by pressure. SOC. PER L'ESERCIZIO DELL' ISTITUTO SPERIMENTALE DEI METALLI LEGGERI. April 30, 1962 [May 30, 1961], No. 16439/62. Heading B3R. In welding a closure member to a pipe, both contacting surfaces being of sintered material, the pipe and member are heated against an externally heated rotatable ring and the member is pressed against the pipe wall by a mandrel during rotation of the ring pipe and closure member. A pipe 1 containing a plug 2, both being of sintered aluminium containing Al 2 O 3 , is mounted in a rotating steel ring 4 on a rotating platform 6, the ring being heated to 400‹ C. by an induction coil 5 and a mandrel 3 mounted in a bearing 7 and initially coaxial with the pipe 1 is moved on a guide 8 until it engages the bottom of the plug. The mandrel is then moved radially to press the plug wall against the pipe wall and is moved rearwardly. The plug and pipe may be of sintered oxidized aluminium, sintered aluminium or sintered aluminium alloy, may be formed from a bar of sintered material or from a plate of sintered aluminium or may be formed by press moulding sintered material. The pipe may form a sheath for a nuclear reactor fuel element. A sintered aluminium plug may be coated internally with aluminium or aluminium alloy.

Inventors

  • 👤 Panseri Carlo

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-31 11:41
CPC Classifications
B; B22; B22F; B22F7/00; B22F7/06; B21; B21D; B21D39/00; B21D39/06; B23; B23K; B23K20/00; B23K20/04; G; G21; G21C; G21C3/00; G21C3/02; G21C3/04; G21C3/06; G21C3/10; Y; Y02; Y02E; Y02E30/00; Y02E30/30

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 123 words
A PROCESS FOR CLOSING BY HOT PRESSURE A THIN-WALLED METAL PIPE, INTENDED PARTICULARLY FOR MANUFACTURING SHEATHS OF FUEL ELEMENTS FOR NUCLEAR REACTORS, SAID METAL PIPE CONSISTING ESSENTIALLY OF SINTERED PRODUCTS OF PARTIALLY OXIDIZED ALUMINUM POWDER; WHICH COMPRISES INTRODUCING THE METAL PIPE, AND A U-SHAPED PLUG OF THE SAME MATERIAL ARRANGED WITH THE OPEN END EXTENDING TOWARD THE OPEN END OF THE PIPE, INTO A ROTATING STEEL RING, HEATING THE STEEL RING, PIPE AND PLUG TO ABOUT 400*C., AND SUBSEQUENTLY PRESSING THE SIDE WALL OF THE PLUG AGAINST THE INNER WALL OF THE PIPE WITH THE BULBOUS HEAD OF A SPINDLE MANDREL ROTATABLY MOUNTED IN A BEARING SO THAT THE HEATED, INTIMATELY CONTACTED SURFACES OF THE PIPE AND PLUG BECOME WELDED TO EACH OTHER.
Claim 2
Dependent Claim 123 words
A PROCESS FOR CLOSING BY HOT PRESSURE A THIN-WALLED METAL PIPE, INTENDED PARTICULARLY FOR MANUFACTURING SHEATHS OF FUEL ELEMENTS FOR NUCLEAR REACTORS, SAID METAL PIPE CONSISTING ESSENTIALLY OF SINTERED PRODUCTS OF PARTIALLY OXIDIZED ALUMINUM POWDER; WHICH COMPRISES INTRODUCING THE METAL PIPE, AND A U-SHAPED PLUG OF THE SAME MATERIAL ARRANGED WITH THE OPEN END EXTENDING TOWARD THE OPEN END OF THE PIPE, INTO A ROTATING STEEL RING, HEATING THE STEEL RING, PIPE AND PLUG TO ABOUT 400*C., AND SUBSEQUENTLY PRESSING THE SIDE WALL OF THE PLUG AGAINST THE INNER WALL OF THE PIPE WITH THE BULBOUS HEAD OF A SPINDLE MANDREL ROTATABLY MOUNTED IN A BEARING SO THAT THE HEATED, INTIMATELY CONTACTED SURFACES OF THE PIPE AND PLUG BECOME WELDED TO EACH OTHER.
Claim 3
Dependent Claim 80 words
APPARATUS FOR CLOSING THIN-WALLED METAL PIPES BY HOT PRESSURE, WHICH COMPRISES A RING MOUNTED ON A ROTATING PLATFORM, HEATING MEANS ON THE OUTER SURFACE OF SAID RING, THE INTERIOR SURFACE OF SAID RING BEING ADAPTED TO CONTAIN THE WORKPIECE, AND A SPINDLE MANDREL HAVING A BULBOUS HEAD ROTATABLY MOUNTED IN A BEARING, SAID SPINDLE BEING TRANSVERSELY MOVABLE INTO AND OUT OF SAID WORKPIECE, AND MEANS FOR MOVING THE SPINDLE AXIS TO AN OFFSET POSITION FROM THE AXIS OF THE WORKPIECE.
Claim 4
Dependent Claim 80 words
APPARATUS FOR CLOSING THIN-WALLED METAL PIPES BY HOT PRESSURE, WHICH COMPRISES A RING MOUNTED ON A ROTATING PLATFORM, HEATING MEANS ON THE OUTER SURFACE OF SAID RING, THE INTERIOR SURFACE OF SAID RING BEING ADAPTED TO CONTAIN THE WORKPIECE, AND A SPINDLE MANDREL HAVING A BULBOUS HEAD ROTATABLY MOUNTED IN A BEARING, SAID SPINDLE BEING TRANSVERSELY MOVABLE INTO AND OUT OF SAID WORKPIECE, AND MEANS FOR MOVING THE SPINDLE AXIS TO AN OFFSET POSITION FROM THE AXIS OF THE WORKPIECE.

References Cited (Backward Citations)

US766227A Cited
US758145A Cited
US2209739A Cited
US2124741A Cited
US2554076A Cited
US2847757A Cited
US2821323A Cited
US3013332A Cited
US3091847A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1969-04-25 1969-10-25 1970-04-26 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1973-04-25 1973-10-25 1974-04-26 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1977-04-25 1977-10-25 1978-04-26 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag