US3955231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cup nut mass production process
Assignee: Individual
•
Filing: 1974-09-18
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Granted: 1976-05-11
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Expires: 1994-09-18
Abstract
Abstract The present process is especially suitable for economically producing cup nuts in large quantities by conventionally manufacturing the nuts and by deep drawing the cups separately from sheet metal in a single step to provide the cup with an outwardly facing chamfer along its edge surrounding the open end of the cup. In other words, the chamfer is produced as the result of the deep drawing step. The cup and the nut are connected by applying pressure and welding current whereby the pressure is applied just prior to, during and shortly after the welding to produce an intimate bond between the nut and cup. Due to the chamfer the welding bond forms an inwardly facing butt welding seam preferably running all around the edge of the cup, whereby a machining after the welding is avoided.
Inventors
- 👤 Heinz W. Erdmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:54
CPC Classifications
F; F16; F16B; F16B37/00; F16B37/14; B; B21; B21D; B21D53/00; B21D53/24; B21K; B21K1/00; B21K1/64; B21K1/70; B21K1/704; B23; B23K; B23K11/00; B23K11/04; B23K11/30; B23K11/3081; B23K33/00; B23K33/004; B23K33/006
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
186 words
In a mass production process for welding metal parts of a cup nut together by means of resistance welding whereby the metal parts are pressed together briefly prior, during and briefly after the application of welding current, the improvement comprising deep drawing from sheet metal in a single step a cup which has a dome and an edge around its open end providing said edge of the cup in said single deep drawing step with an outwardly facing chamfer having an inwardly rising circular ridge, then substantially axially aligning said cup with a standard nut so that the inwardly rising circular ridge of the chamfer contacts a nut face, axially pressing the nut and cup together, applying welding current while maintaining said pressing, and removing said axial pressure briefly after the termination of the welding current whereby the material of the cup adjacent to said chamfer is used to form an inwardly facing one sided butt welding seam without a visible welding seam at the juncture of the nut and the outer edge of the cup and thus a machining of the welding seam is obviated.
Claim 2
Dependent Claim
186 words
In a mass production process for welding metal parts of a cup nut together by means of resistance welding whereby the metal parts are pressed together briefly prior, during and briefly after the application of welding current, the improvement comprising deep drawing from sheet metal in a single step a cup which has a dome and an edge around its open end providing said edge of the cup in said single deep drawing step with an outwardly facing chamfer having an inwardly rising circular ridge, then substantially axially aligning said cup with a standard nut so that the inwardly rising circular ridge of the chamfer contacts a nut face, axially pressing the nut and cup together, applying welding current while maintaining said pressing, and removing said axial pressure briefly after the termination of the welding current whereby the material of the cup adjacent to said chamfer is used to form an inwardly facing one sided butt welding seam without a visible welding seam at the juncture of the nut and the outer edge of the cup and thus a machining of the welding seam is obviated.
Claim 3
Dependent Claim
22 words
The mass production process according to claim 1, wherein said cup and nut are at room temperature immediately prior to said welding.
Claim 4
Dependent Claim
40 words
The mass production process according to claim 1, wherein said welding current is applied for a duration of 0.04 to 0.1 seconds and wherein the application of pressure slightly precedes and exceeds said duration by about 0.01 to 0.05 seconds.
Claim 5
Dependent Claim
31 words
The mass production process according to claim 1, comprising selecting the axial height of the chamfer so as to provide material just sufficient to form said butt weld seam facing inwardly.
Claim 6
Dependent Claim
82 words
The mass production process according to claim 1, comprising providing said nut face with a circular flat ring surface having given inner and outer diameters and providing said deep drawn cup with an outer diameter equal to said given outer diameter of the ring surface of the nut, and further providing said deep drawn cup with an inner diameter larger than the inner diameter of said ring surface to provide a space at least sufficient for said inwardly facing butt weld seam.
Claim 7
Dependent Claim
43 words
The mass production process according to claim 1, wherein said deep drawing of the sheet metal cup produces said outwardly facing chamfer with an outwardly opening angle against the plane of the cup opening which angle ranges from about 2° to about 20°.
Claim 8
Dependent Claim
13 words
A welded cup nut when produced according to the process of claim 1.
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) | 1979-05-11 | 1979-11-10 | 1980-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-11 | 1983-11-10 | 1984-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-11 | 1987-11-10 | 1988-05-11 | $7700.00 | Window Closed / Lapsed |