Patent US3708253A successfully refreshed from Google Patents.

US3708253A Expired / Lapsed US ⏱️ 0.0 years remaining

Extrusion apparatus

Assignee: Individual

•

Filing: 1970-09-01

•

Granted: 1973-01-02

•

Expires: 1990-09-01

📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract An apparatus and method are provided for forming tubular extrusions which vary in shape along their length. In one form, an extrusion is belled outwardly along selected portions of its length to provide, when severed along the belled portions, means for joining sections of the extrusion together as in a piping system, without the need for separately formed fittings. The variation in diameter of the extrusion may be effected in a number of manners employing tooling associated either with the mandrel over which the tubing is formed to shape or mounted against or adjacent to the external face of the extrusion die. Modified forms of the apparatus may also be provided to machine or outwardly deform portions of preformed tubing.

Inventors

👤 J Lemelson

Bibliographic Details

Application Number —

Jurisdiction US

Data Source google_patents

Last Synchronized 2026-10-25 17:07

CPC Classifications

B; B29; B29C; B29C53/00; B29C53/22; B29C53/30; B29C48/00; B29C48/03; B29C48/09; B29C48/13; B29C48/25; B29C48/30; B29C48/32; B29C48/325; B29C57/00; B29C57/02; B29C57/08; B29C48/001; B29C48/0017; B29C48/0022; B29L; B29L2023/00; B29L2023/003

Claims Analysis

Total Claims: 11

Claim 1

Independent Claim 160 words

An extrusion apparatus for forming tubing of variable crosssection comprising: an extrusion die, a mandrel supported within an extending through the opening in said die, said mandrel conforming to the inside surface of an extrusion formed in said die, means for guiding said mandrel for movement within said die, said die connected to an extrusion chamber for feeding material through said die and over said mandrel to form a tubular extrusion thereof, shape-changing means including tool means supported by said mandrel and moveable with respect to said mandrel for changing the shape of a tubular extrusion preViously formed in said die, first power means for moving said tool means with respect to said mandrel, second power means for moving said mandrel within said die, and means for variably operating said shape changing means and moving said mandrel to cause selected portions of an extrusion passed through said die to be variably changed in shape along the length of the extrusion.

Claim 2

Dependent Claim 160 words

Claim 3

Dependent Claim 50 words

Extrusion apparatus in accordance with claim 1, wherein said shape-changing means is movably supported on said mandrel and is operable by said power means to move radially outwardly from said mandrel and engage the inside surface of the extrusion passing over the mandrel so as to change the shape thereof.

Claim 4

Dependent Claim 38 words

Extrusion apparatus in accordance with claim 2, wherein said shape-changing means is operable to outwardly deform the wall of the tubular extrusion to increase its outside diameter when said shape-changing means is power driven outwardly from said mandrel.

Claim 5

Dependent Claim 37 words

Apparatus in accordance with claim 2, wherein said shape-changing means includes tooling operative to engage and change the shape of the inside surface of the tubular extrusion passed through said die when operated by said power means.

Claim 6

Dependent Claim 30 words

An apparatus in accordance with claim 2, including means for power rotating said mandrel as said shape-changing means is moved outwardly therefrom so as to circumscribingly deform the tubular extrusion.

Claim 7

Dependent Claim 24 words

Apparatus in accordance with claim 5, wherein said shape-changing means is operative to outwardly bell the wall of the extrusion as it is rotated.

Claim 8

Dependent Claim 30 words

Apparatus in accordance with claim 5, wherein said shape-changing means is operative to machine the inside surface of said tubular extrusion and said shape-changing means is rotated with said mandrel.

Claim 9

Dependent Claim 29 words

Apparatus in accordance with claim 5, wherein said shape-changing means is operative to spirally bead the wall of said extrusion while the extrusion is driven over the rotating mandrel.

Claim 10

Dependent Claim 54 words

Apparatus in accordance with claim 1, said extrusion shape-changing means being operative when actuated to thread the wall of the extrusion and means for activating and de-activating said shape-changing means during predetermined times in an extrusion cycle so as to thread selected portions of the extrusion to the exclusion of the other portions thereof.

Claim 11

Dependent Claim 52 words

Apparatus in accordance with claim 1, wherein said shape-changing means comprises first tooling associated with said mandrel and second tooling supported beyond the end of said die, and means for operating said first and second toolings to cooperate with each other in deforming selected portions of the extrusions formed in the die.

References Cited (Backward Citations)

US3085293A Cited

US3068517A Cited

US3205535A Cited

US3425093A Cited

US3283050A Cited

US3484900A Cited

US3432887A Cited

US3538548A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1976-01-02	1976-07-03	1977-01-02	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1980-01-02	1980-07-03	1981-01-02	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1984-01-02	1984-07-03	1985-01-02	$7700.00	Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag

Select Category

Notes (Optional)