US3854314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Step controlled tube expander
Assignee: Dresser Industries Inc
•
Filing: 1973-07-25
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Granted: 1974-12-17
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Expires: 1993-07-25
Abstract
Abstract A power operated tube expander apparatus having automatic step control for deep hole rolling of a tube to a header sheet. A stop collar in the form of a thrust assembly is supported on the cage behind the expander rollers to prevent movement of the cage inward of the tube during the expansion operation. After rolling a longitudinal segment of tube, controls are operable to displaceably step the collar a predetermined incremental distance longitudinally away from the expander end. This allows an additional segment of tube to be subsequently rolled. Stepping of the collar continues until completing total joinder of the tube to the header.
Inventors
- 👤 P Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:06
CPC Classifications
B; B21; B21D; B21D39/00; B21D39/06; B21D39/08; B21D39/10; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53039; Y10T29/53061; Y10T29/53065; Y10T29/53113; Y10T29/53122
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
136 words
Tube expander apparatus comprising in combination: a. a rotatable expander for insertion into an end of a receiving tube to be expanded against a header sheet; b. motor means for rotatably driving said expander within the receiving tube in rolling relation to a longitudinal wall segment thereof for effecting tube expansion of the segment against the header; c. a stop collar supported on said expander at a location outward of the receiving tube end to prevent said expander from advancing inward of the tube beyond said segment while said rolling relation is being conducted; and d. control means operable after said expansion is completed to displaceably step said collar to a support location a predetermined distance away from the tube end for said expander to subsequently conduct expansion on an additional wall segment of said tube.
Claim 2
Dependent Claim
136 words
Tube expander apparatus comprising in combination: a. a rotatable expander for insertion into an end of a receiving tube to be expanded against a header sheet; b. motor means for rotatably driving said expander within the receiving tube in rolling relation to a longitudinal wall segment thereof for effecting tube expansion of the segment against the header; c. a stop collar supported on said expander at a location outward of the receiving tube end to prevent said expander from advancing inward of the tube beyond said segment while said rolling relation is being conducted; and d. control means operable after said expansion is completed to displaceably step said collar to a support location a predetermined distance away from the tube end for said expander to subsequently conduct expansion on an additional wall segment of said tube.
Claim 3
Dependent Claim
15 words
Tube expander apparatus according to claim 1 in which said control means is pneumatically actuated.
Claim 4
Dependent Claim
21 words
Tube expander apparatus according to claim 2 including latch means and a stepping cylinder concomitantly operative for displaceably stepping said collar.
Claim 5
Dependent Claim
47 words
Tube expander apparatus according to claim 1 including coupling means operatively effective while said rolling relation is being conducted to longitudinally couple said collar to said expander and said control means includes release means effective when operable to release said coupling means for displaceably stepping said collar.
Claim 6
Dependent Claim
51 words
Tube expander apparatus according to claim 4 including a longitudinally movable stepping bar operably connecting said collar to said control means, said stepping bar having a plurality of recesses defined longitudinally spaced apart in its periphery at incremental distances correlated to the stepping distances to be effected by said control means.
Claim 7
Dependent Claim
28 words
Tube expander apparatus according to claim 5 including latch means operable in controlled sequence by said control means to a latch or release relation with said stepping bar.
Claim 8
Dependent Claim
66 words
Tube expander apparatus according to claim 6 in which said expander comprises an elongated cylindrical cage having a plurality of annular recesses defined longitudinally spaced apart in its periphery at distances corresponding to the incremental recess distance of said stepping bar, said collar is supported on said cage and said coupling means is operatively cooperative with said recesses to longitudinally couple said collar to said expander.
Claim 9
Dependent Claim
67 words
Tube expander apparatus according to claim 6 including stepping means operable in controlled sequence by said control means to displace said latch means in a first direction relative to said stepping bar when the latch means is in a release relation therewith and to displace said latch means together with said stepping bar in an opposite direction when said latch means is in a latch relation therewith.
Claim 10
Dependent Claim
22 words
Tube expander apparatus according to claim 8 in which said stepping means comprises a stepping cylinder operative concomitantly with said latch means.
Claim 11
Dependent Claim
15 words
Tube expander apparatus according to claim 9 in which said control means is pneumatically actuated.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |