US3828515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-slip, high strength bolted joints
Assignee: Individual
•
Filing: 1971-05-21
•
Granted: 1974-08-13
•
Expires: 1991-05-21
Abstract
Abstract Improved non-slip structural joints between metal members held together by high strength bolts means which hold them in forcible face-to-face engagement, and method of forming such joints. In accordance with the invention strong shearing elements are partially embedded in at least one of the metal members and extend across the interface therebetween. The shearing elements may be separate from and embedded in both metal members, or may be parts of the metal members and embedded in the other of the metal members.
Inventors
- 👤 T Palagyi
- 👤 J Wagensommer
- 👤 G Galgoczy
- 👤 Z Gyulai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:28
CPC Classifications
B; B21; B21D; B21D39/00; B21D39/03; F; F16; F16B; F16B2/00; F16B2/005; F16B5/00; F16B5/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49833; Y10T403/00; Y10T403/49; Y10T403/4941; Y10T403/71; Y10T403/7123
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
146 words
In a non-slip, high Strength, bolted joint having at least a pair of members with confronting contact surfaces pressed together by at least one bolt, said contact surfaces having an average roughness and consisting of a base material, a numerous plurality of shearing elements being disposed on at least one of said contact surfaces, the strength and hardness of said shearing elements exceeding the strength and hardness of said base material, the minimum dimension of said shearing elements being at least equal to 0.004 inch and the average distance between the greatest height and lowest depth of the protuberances and recesses of the said roughness of the contact surfaces along a 0.1 inch sampling length on said contacting surfaces being at least equal to 0.004 inch, at least a major portion of said plurality of shearing elements extending across the interface of said confronting contact surfaces.
Claim 2
Dependent Claim
146 words
In a non-slip, high Strength, bolted joint having at least a pair of members with confronting contact surfaces pressed together by at least one bolt, said contact surfaces having an average roughness and consisting of a base material, a numerous plurality of shearing elements being disposed on at least one of said contact surfaces, the strength and hardness of said shearing elements exceeding the strength and hardness of said base material, the minimum dimension of said shearing elements being at least equal to 0.004 inch and the average distance between the greatest height and lowest depth of the protuberances and recesses of the said roughness of the contact surfaces along a 0.1 inch sampling length on said contacting surfaces being at least equal to 0.004 inch, at least a major portion of said plurality of shearing elements extending across the interface of said confronting contact surfaces.
Claim 3
Dependent Claim
41 words
A non-slip high strength bolted joint according to claim 1 comprising a washer disposed between said contacting surfaces, the shearing elements being disposed upon the washer and having apices pointing in opposite directions and embedded in the respective confronting contact surfaces.
Claim 4
Dependent Claim
38 words
Non-slip joints according to claim 2, wherein the shearing elements are applied to the contact surface by means of a washer and are in the shape of double cones superimposed along their bases and have cylinders inserted therebetween.
Claim 5
Dependent Claim
18 words
Non-slip joints according to claim 2, characterised in that cubic shearing elements are provided on the contact surfaces.
Claim 6
Dependent Claim
38 words
Non-slip joints according to claim 2, wherein the shearing elements are applied to the contact surface by means of a washer and are in the shape of double pyramids superimposed along their bases and have prisms inserted therebetween.
Claim 7
Dependent Claim
45 words
A non-slip high strength bolted joint according to claim 2, comprising a foil disposed about the bolt and between the contacting surfaces, the shearing elements being disposed upon the foil and having apices pointing in opposite directions and embedded in the respective confronting contacting surfaces.
Claim 8
Dependent Claim
36 words
Non-slip joints according to claim 6, wherein the shearing elements applied to the contact surface by means of a foil are in the shape of double cones superimposed along their bases and have cylinders inserted therebetween.
Claim 9
Dependent Claim
36 words
Non-slip joints according to claim 6, wherein the shearing elements applied to the contact surface by means of a foil are in the shape of double pyramids superimposed along their bases and have prisms inserted therebetween.
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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |