US3787945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fabricating an expanded tube connection
Assignee: Motors Liquidation Co
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Filing: 1973-05-14
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Granted: 1974-01-29
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Expires: 1993-05-14
Abstract
Abstract An expanded tube connection and method wherein a relative thinwalled tube extending through a counterbored tube block is upset on one side of the tube block to lock the tube to the tube block and wherein the tube is expanded within the apertured tube block to lock it to the tube block while at the same time providing a predetermined size cavity between the tube and the tube block for an O-ring seal.
Inventors
- 👤 J Pasek
- 👤 J Shea
- 👤 M Tobin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:54
CPC Classifications
B; B21; B21D; B21D39/00; B21D39/06; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49373; Y10T29/49375; Y10T29/49826; Y10T29/49908; Y10T29/49938; Y10T29/4994
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
166 words
The method of forming a tube to tube block connection wherein said tube block is provided with a through counterbore consisting of opposed coaxial first and second bores of different diameters extending from opposite sides of said tube block and joining coaxially with an intervening radial wall, said method comprising the steps of fixing said tube within said counterbore with an Oring encircling said tube and positioned against said radial wall, inserting a stepped mandrel having first and second diameter portions thereon with an inclined shoulder portion therebetween into said tube a predetermined distance to expand said tube within said tube block to form enlarged diameter first and second portions thereof in interference engagement with said first and second bores, respectively, while at the same time forming an inclined annular portion on said tube between said enlarged diameter first and second portions so as to form with said first bore and said radial wall a seal ring cavity of predetermined size and configuration for said O-ring.
Claim 2
Independent Claim
166 words
The method of forming a tube to tube block connection wherein said tube block is provided with a through counterbore consisting of opposed coaxial first and second bores of different diameters extending from opposite sides of said tube block and joining coaxially with an intervening radial wall, said method comprising the steps of fixing said tube within said counterbore with an Oring encircling said tube and positioned against said radial wall, inserting a stepped mandrel having first and second diameter portions thereon with an inclined shoulder portion therebetween into said tube a predetermined distance to expand said tube within said tube block to form enlarged diameter first and second portions thereof in interference engagement with said first and second bores, respectively, while at the same time forming an inclined annular portion on said tube between said enlarged diameter first and second portions so as to form with said first bore and said radial wall a seal ring cavity of predetermined size and configuration for said O-ring.
Claim 3
Dependent Claim
38 words
The method of forming a tube to tube block connection of claim 1 further including the step of forming an annular bead on said tube to abut against said tube block adjacent to said enlarged diameter second portion.
Claim 4
Independent Claim
211 words
The method of forming a tube to tube block connection wherein said tube block is provided with a first surface portion and a second surface portion on opposite sides thereof and with a first partly splined bore in said tube block extending from said first surface and a second bore of reduced diameter in said tube block extending from said second surface and meeting coaxially with said first bore with an intervening shoulder therebetween; said method comprising the steps of fixing said tube within said first partly splined bore and said second bore with an O-ring encircling said tube and positioned against said intervening shoulder, inserting a stepped mandrel having first and second diameter portions with an inclined shoulder portion therebetween into said tube a predetermined distance to expand and extrude said tube within said tube block to form enlarged diameter first and second portions thereof in interference engagement with said first partly splined bore and said second bore, respectively, and to form an inclined annular portion on said tube between said enlarged diameter first and second portions extending into said first partially splined bore so as to form with said first partly splined bore and said intervening shoulder a seal ring cavity of predetermined size and configuration for said O-ring.
Claim 5
Independent Claim
211 words
The method of forming a tube to tube block connection wherein said tube block is provided with a first surface portion and a second surface portion on opposite sides thereof and with a first partly splined bore in said tube block extending from said first surface and a second bore of reduced diameter in said tube block extending from said second surface and meeting coaxially with said first bore with an intervening shoulder therebetween; said method comprising the steps of fixing said tube within said first partly splined bore and said second bore with an O-ring encircling said tube and positioned against said intervening shoulder, inserting a stepped mandrel having first and second diameter portions with an inclined shoulder portion therebetween into said tube a predetermined distance to expand and extrude said tube within said tube block to form enlarged diameter first and second portions thereof in interference engagement with said first partly splined bore and said second bore, respectively, and to form an inclined annular portion on said tube between said enlarged diameter first and second portions extending into said first partially splined bore so as to form with said first partly splined bore and said intervening shoulder a seal ring cavity of predetermined size and configuration for said O-ring.
Claim 6
Dependent Claim
42 words
The method of forming a tube to tube block connection according to claim 3 including the steP of forming an external annular bead on said tube externally of said tube block in abutment against said second surface portion of said tube block.
Claim 7
Dependent Claim
50 words
The method of forming a tube to tube block connection according to claim 3 including the step of reforming a free end of said tube adjacent to said enlarged diameter first portion and outside said tube block to a diameter less than the diameter of said enlarged diameter first portion.
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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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |