US4087897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making an end connection to a fluid power cylinder and product
Assignee: Airmatic Beckett Harcum Inc
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Filing: 1976-03-22
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Granted: 1978-05-09
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Expires: 1996-03-22
Abstract
Abstract A method of making an end connection to a fluid power cylinder and product wherein a hollow metallic cylindrical tubing is deformed into a step shape to conform to a channel shaped recess provided in the shank of the end cap.
Inventors
- 👤 Edward H. Scholefield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:21
CPC Classifications
B; B21; B21K; B21K25/00; B21D; B21D39/00; B21D39/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49915; Y10T29/49925; Y10T29/49927; Y10T29/49929; Y10T403/00; Y10T403/49; Y10T403/4991
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
131 words
A method of making an end connection to a fluid power cylinder comprising the steps of: providing a cylindrical end cap having a reduced diameter, integral shank at one end thereof and defining with the remainder of said cap a radially extending shoulder, said shank being equipped with a channel-shaped annular inwardly extending recess adjacent said shoulder, inserting said shank into a hollow metallic cylindrical tubing to cause said tubing to abut said shoulder, simultaneously forcing said tubing against said shoulder while inwardly deforming said tubing into said recess to cause cold working and metal flow in said tubing and to form an integral, generally right-angle step portion therein, and deforming said end cap to cause an integral portion thereof to overlie and clamp said right-angle step portion to said shank.
Claim 2
Independent Claim
131 words
A method of making an end connection to a fluid power cylinder comprising the steps of: providing a cylindrical end cap having a reduced diameter, integral shank at one end thereof and defining with the remainder of said cap a radially extending shoulder, said shank being equipped with a channel-shaped annular inwardly extending recess adjacent said shoulder, inserting said shank into a hollow metallic cylindrical tubing to cause said tubing to abut said shoulder, simultaneously forcing said tubing against said shoulder while inwardly deforming said tubing into said recess to cause cold working and metal flow in said tubing and to form an integral, generally right-angle step portion therein, and deforming said end cap to cause an integral portion thereof to overlie and clamp said right-angle step portion to said shank.
Claim 3
Dependent Claim
43 words
The method of claim 1 in which said tubing deformation step includes the application of a rolling force to said tubing rolling force extending in a direction forming a minor acute angle with a radial line extending from the axis of said cylinder.
Claim 4
Dependent Claim
12 words
The method of claim 2 in which said angle is approximately 1°.
Claim 5
Dependent Claim
24 words
The method of claim 1 in which said tubing is constructed of stainless steel in the range of about 1/4 to 3/8 hard condition.
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) | 1981-05-08 | 1981-11-07 | 1982-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-08 | 1985-11-07 | 1986-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-08 | 1989-11-07 | 1990-05-09 | $7700.00 | Window Closed / Lapsed |