Patent US3924433A successfully refreshed from Google Patents.
US3924433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stop collar for tube expander
Assignee: Dresser Industries Inc
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Filing: 1973-07-09
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Granted: 1975-12-09
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Expires: 1993-07-09
Abstract
Abstract A tube expander having a stop collar for limiting advance of a received tube end to a predetermined axial location relative to the expander rollers and their supporting cage. The collar is comprised of a plurality of individual L-shaped wire fingers circumferentially displaced about the cage. Each finger is spring biased radially inward against the cage periphery transversely to the path of tube advance. By this arrangement, the fingers are maintained in surface tracking relation against the rotating cage for collectively acting as a barrier against further advance by the tube end.
Inventors
- 👤 Paul Warren Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:39
CPC Classifications
B; B21; B21D; B21D39/00; B21D39/06; B21D39/08; B21D39/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
133 words
In a tube expander including a rotatable tubular cage about which to receive a tube end to be expanded, forming rollers contained in the outer periphery of said cage and a rotatable tapered mandrel within said cage for driving said cage and rollers in an expanding relation to a tube and received thereon, a substantially non-rotatable stop collar adapted for limiting axial advance of a received tube end onto said cage, said stop collar comprising a plurality of individual means disposed circumferentially about said cage operably independent of each other, said individual means each extending into engagement with the periphery of said cage at a predetermined location in the path of tube advance, and being operably adapted to follow the rotating periphery of said cage and rollers in a surface tracking relation therewith.
Claim 2
Dependent Claim
133 words
In a tube expander including a rotatable tubular cage about which to receive a tube end to be expanded, forming rollers contained in the outer periphery of said cage and a rotatable tapered mandrel within said cage for driving said cage and rollers in an expanding relation to a tube and received thereon, a substantially non-rotatable stop collar adapted for limiting axial advance of a received tube end onto said cage, said stop collar comprising a plurality of individual means disposed circumferentially about said cage operably independent of each other, said individual means each extending into engagement with the periphery of said cage at a predetermined location in the path of tube advance, and being operably adapted to follow the rotating periphery of said cage and rollers in a surface tracking relation therewith.
Claim 3
Dependent Claim
38 words
In a tube expander according to claim 1 in which said individual means extend radially toward said cage to impose a lateral barrier in interfering relation with the end of a received tube for limiting axial advance thereof.
Claim 4
Dependent Claim
29 words
In a tube expander according to claim 2 in which said individual means are comprised of a resilient material fixedly supported and radially biased into said surface tracking relation.
Claim 5
Dependent Claim
28 words
In a tube expander according to claim 3 in which said individual means comprise individual L-shaped fingers each having one end that terminates in said surface tracking relation.
Claim 6
Dependent Claim
18 words
In a tube expander according to claim 4 in which said fingers are of a spring wire composition.
Claim 7
Dependent Claim
36 words
In a tube expander according to claim 5 including a thrust collar having a plurality of apertures in which to receive and support said fingers and means to secure a finger in each of said apertures.
Claim 8
Dependent Claim
52 words
In a tube expander according to claim 6 in which each of said fingers is comprised of an arm portion generally extending in an axial direction from one of said apertures and a leg portion generally extending in a lateral direction from said arm portion radially toward the periphery of said cage.
Claim 9
Dependent Claim
37 words
In a tube expander according to claim 7 in which the radial extent of said leg portion is generally greater than the radial distance of said cage periphery to the finger supporting aperture in said thrust collar.
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) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |