Patent US3585894A successfully refreshed from Google Patents.
US3585894A
Expired / Lapsed
US
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Self-drilling and tapping screw with lead unit
Assignee: Union Tank Car Co
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Filing: 1969-06-02
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Granted: 1971-06-22
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Expires: 1989-06-02
Abstract
Abstract A self-drilling and tapping screw assembly comprising a screw with a threaded section and an end drilling section. The drilling section is embedded in a lead unit which includes a thin metal backup washer, a thin rubberlike surface sealing washer and a relatively thicker, smaller diameter, thread sealing washer. The drilling point of the drilling section extends to adjacent a contact surface of the thicker washer.
Inventors
- 👤 Fred Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:51
CPC Classifications
F; F16; F16B; F16B25/00; F16B25/10; F16B25/001; F16B25/0021; F16B43/00; F16B5/00; F16B5/02; F16B2200/00; F16B2200/60; Y; Y10; Y10S; Y10S411/00; Y10S411/915; Y10T; Y10T408/00; Y10T408/47
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
156 words
In combination, a self-drilling and tapping screw assembly securing a first member, having an aperture therein, to a second member comprising: a. a screw having a threaded section and a drilling section; b. a drilling point at the free end of said drilling section; and c. a drilling lead unit seated on said drilling section; d. said lead unit including resilient means through which said drilling section extends; e. said resilient means comprises annular rubber washer means, said annular rubber washer means includes a first washer section having an outside diameter substantially equal to the diameter of said aperture in said first member and a thickness equal to or slightly greater than the thickness of said first member and a second washer section having a larger diameter than said first washer section; f. said first washer section having a contact surface and said drilling point being disposed in said resilient means adjacent to said contact surface.
Claim 2
Dependent Claim
156 words
In combination, a self-drilling and tapping screw assembly securing a first member, having an aperture therein, to a second member comprising: a. a screw having a threaded section and a drilling section; b. a drilling point at the free end of said drilling section; and c. a drilling lead unit seated on said drilling section; d. said lead unit including resilient means through which said drilling section extends; e. said resilient means comprises annular rubber washer means, said annular rubber washer means includes a first washer section having an outside diameter substantially equal to the diameter of said aperture in said first member and a thickness equal to or slightly greater than the thickness of said first member and a second washer section having a larger diameter than said first washer section; f. said first washer section having a contact surface and said drilling point being disposed in said resilient means adjacent to said contact surface.
Claim 3
Dependent Claim
42 words
The self-drilling and tapping screw assembly of claim 1 further characterized in that: a. said first washer section has a generally planar contact surface at the free end thereof; and b. said drilling point being disposed substantially at said planar contact surface.
Claim 4
Dependent Claim
28 words
The self-drilling and tapping screw assembly of claim 1 further characterized in that: a. said tapping lead unit includes a metal washer bonded to said second washer section.
Claim 5
Dependent Claim
48 words
The self-drilling and tapping screw assembly of claim 3 further characterized in that: a. said metal washer has an outside diameter at least as large as said second washer section outside diameter, and an inside diameter larger than the inside diameter of said first and second washer sections.
Claim 6
Dependent Claim
44 words
The self-drilling and tapping screw assembly of claim 1 further characterized in that: a. the inside diameter of said first and second washer sections are less than the outside diameter of said drilling section and less than the outside diameter of said threaded section.
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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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |