Patent US3906771A successfully refreshed from Google Patents.
US3906771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expander for random trim tubing
Assignee: Dresser Industries Inc
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Filing: 1974-07-17
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Granted: 1975-09-23
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Expires: 1994-07-17
Abstract
Abstract A tube expander operable with random length tubing having variable length projection beyond the face of header sheet into which the tube is to be expanded. Rollers in an expander cage are supported on a rotatable mandrel for insertion inward of the tube end. An open ended non-rotatable, tubular thrust collar is adapted to envelop the tube end and is secured about the cage at a predetermined location generally rearward of the rollers. Within the collar and biased toward the open end thereof is a slideable stop sleeve sized to abut the projecting end of the tube. On being advanced over the tube projection toward the header sheet for preliminary positioning, the collar engages the sheet face to register location of the rollers within the tube in alignment with the header sheet. Concomitantly with positioning of the collar, the abutting tube end acts to prevent sleeve movement as to effect relative displacement between sleeve and collar which can then be secured for operation of the expander.
Inventors
- 👤 Paul Warren Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:50
CPC Classifications
B; B21; B21D; B21D39/00; B21D39/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
165 words
In a tube expander for expanding an axially positioned tube to a header sheet Beyond which the tube end is projecting and including a rotatable tubular cage for insertion in 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 the tube end, the combination therewith of: a. a non-rotatable tubular thrust collar operatively supported on said cage at a predetermined secured location displaced from said rollers, said collar having an inlet in which to receive the projecting end of a tube in which said cage is inserted and being movable thereover past the tube end toward the face of the header sheet; and b. a stop sleeve slideably supported on said cage internally of said collar and abuttable against the end face of the received tube to be arrested by the tube end against movement together with said collar.
Claim 2
Dependent Claim
165 words
In a tube expander for expanding an axially positioned tube to a header sheet Beyond which the tube end is projecting and including a rotatable tubular cage for insertion in 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 the tube end, the combination therewith of: a. a non-rotatable tubular thrust collar operatively supported on said cage at a predetermined secured location displaced from said rollers, said collar having an inlet in which to receive the projecting end of a tube in which said cage is inserted and being movable thereover past the tube end toward the face of the header sheet; and b. a stop sleeve slideably supported on said cage internally of said collar and abuttable against the end face of the received tube to be arrested by the tube end against movement together with said collar.
Claim 3
Dependent Claim
48 words
In a tube expander according to claim 1 in which the secured location of said collar relative to said cage rollers is presettably adjustable to substantially correlate with the expansion position setting of said rollers inward of the tube end relative to the face of the header sheet.
Claim 4
Dependent Claim
21 words
In a tube expander according to claim 1 including biasing means urging said stop sleeve toward the inlet of said collar.
Claim 5
Dependent Claim
35 words
In a tube expander according to claim 1 including lock means to secure said stop sleeve to said collar at any displaced relation therebetween incurred by movement of said collar relative to said arrested sleeve.
Claim 6
Dependent Claim
32 words
In a tube expander according to claim 4 in which said lock means includes a releaseable interfit defined on the internal surface of said collar and the external surface of said sleeve.
Claim 7
Dependent Claim
36 words
In a tube expander according to claim 5 in which said releaseable interfit comprises a plurality of circumferentially extending arcuate peaks and notches formed in tandem on the surfaces of each of said collar and sleeve.
Claim 8
Dependent Claim
33 words
In a tube expander according to claim 6 in which the peaks and notches on said sleeve are contained on a arcuate segment extending radially outward from the adjacent periphery of said sleeve.
Claim 9
Dependent Claim
47 words
In a tube expander according to claim 7 in which the circumferential extent of said segment is defined by an acute angle and there is included screw means operable to move said sleeve radially into a secured engagement with the interfitting surfaces of said collar and sleeve.
Claim 10
Dependent Claim
21 words
In a tube expander according to claim 8 including spring means urging said stop sleeve toward the inlet of said 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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |