US4974989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for reducing installation forces and costs in a tapered bolt installation
Assignee: Individual
•
Filing: 1983-08-22
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Granted: 1990-12-04
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Expires: 2003-08-22
Abstract
Abstract A stacked array comprising at least one or more similar or dissimilar metals or composites and having either a tapered bore or a tapered sleeve. A tapered bolt adapted to be inserted into the tapered bore and having a taper that is different from the tapered bore. A method for selecting a greater or lesser taper on the bolt than the taper on the bore depending on the relative strength of the materials forming the stacked array as a means of reducing the installation force of the tapered bolt within the tapered bore.
Inventors
- 👤 Larry Salter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:22
CPC Classifications
F; F16; F16B; F16B5/00; F16B5/02; F16B2200/00; F16B2200/50; F16B2200/506; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49945; Y10T403/00; Y10T403/57; Y10T403/5761; Y10T403/5766; Y10T403/5781; Y10T403/71; Y10T403/7123; Y10T403/75
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
86 words
A method of reducing installation forces in a stacked array of layers of different materials having a tapered bore which comprises the steps of: selecting a tapered fastener having a degree of taper that is different from the degree of taper of the bore in the stacked array, and then inserting the tapered fastener into the tapered bore until point contact between the tapered fastener and the tapered bore of the more deformable layer results in incremental deformation of said bore and a lower installation force.
Claim 2
Independent Claim
86 words
A method of reducing installation forces in a stacked array of layers of different materials having a tapered bore which comprises the steps of: selecting a tapered fastener having a degree of taper that is different from the degree of taper of the bore in the stacked array, and then inserting the tapered fastener into the tapered bore until point contact between the tapered fastener and the tapered bore of the more deformable layer results in incremental deformation of said bore and a lower installation force.
Claim 3
Dependent Claim
37 words
A method according to claim 1 in which the selected tapered fasteners results in point contact taking place at the largest diameter of the tapered bore thereby providing correct hole bearing with respect to materials being used.
Claim 4
Dependent Claim
26 words
A method according to claim 1 in which the selected tapered fastener results in point contact taking place at the smallest diameter of the tapered bore.
Claim 5
Dependent Claim
69 words
A method according to claim 1 which includes the steps of: determining the relative strength of the metal in the stacked array, and then selecting a tapered fastener having a degree of taper that is less than the degree of taper of the bore in the event the largest diameter in the stacked array has a lower pounds per square inch stress than the other layers of stacked materials.
Claim 6
Dependent Claim
68 words
A method according to claim 1 which includes the method of determining whether the surface material having the largest diameter in the stacked array has a stress concentration that is less than the other materials comprising the stacked array, and then selecting a tapered fastener having a degree of taper that is less than the degree of taper of the tapered bore thereby achieving a reduced installation force.
Claim 7
Independent Claim
92 words
A method of reducing installation forces in the prestressed fastening of layers of material having different modulus of elasticity which comprises the steps of: providing a tapered bore having a given taper through layers of materials to be fastened; selecting a tapered bolt with a degree of taper depending on whether the material having the smaller modulus of elasticity is located above or below the material having the greater modulus of elasticity; and then inserting the selected bolt into said bore until permanent deformation of the tapered bore surface has taken place.
Claim 8
Independent Claim
92 words
A method of reducing installation forces in the prestressed fastening of layers of material having different modulus of elasticity which comprises the steps of: providing a tapered bore having a given taper through layers of materials to be fastened; selecting a tapered bolt with a degree of taper depending on whether the material having the smaller modulus of elasticity is located above or below the material having the greater modulus of elasticity; and then inserting the selected bolt into said bore until permanent deformation of the tapered bore surface has taken place.
Claim 9
Dependent Claim
62 words
A method of reducing installation forces according to claim 6 in which the step of selecting a tapered bolt further comprises: selecting a tapered bolt having a degree of taper that is greater then the taper on the bore for those situations where the material having the smaller modulus of elasticity is located above the material having the greater modulus of elasticity.
Claim 10
Dependent Claim
62 words
A method of reducing installation forces according to claim 6 in which the step of selecting a tapered bolt further comprises: selecting a tapered bolt having a degree of taper that is less then the taper on the bore for those situations where the material having the smaller modulus of elasticity is located below the material having the greater modulus of elasticity.
Claim 11
Independent Claim
79 words
A method of reducing installation forces in the prestressed fastening of layers of titanium over aluminum which comprises the steps of: providing a tapered bore having a given degree of taper through the layers of titanium and aluminum; selecting a tapered bolt having a given degree of taper that is greater than the degree of taper on the bore; and then inserting the selected bolt into said bore until permanent deformation of the tapered bore surface has taken place.
Claim 12
Independent Claim
79 words
A method of reducing installation forces in the prestressed fastening of layers of titanium over aluminum which comprises the steps of: providing a tapered bore having a given degree of taper through the layers of titanium and aluminum; selecting a tapered bolt having a given degree of taper that is greater than the degree of taper on the bore; and then inserting the selected bolt into said bore until permanent deformation of the tapered bore surface has taken place.
Claim 13
Independent Claim
79 words
A method of reducing installation forces in the prestressed fastening of layers of aluminum over titanium which comprises the steps of: providing a tapered bore having a given degree of taper through the layers of aluminum and titanium; selecting a tapered bolt having a given degree of taper that is less than the degree of taper on the bore; and then inserting the selected bolt into said bore until permanent deformation of the tapered bore surface has taken place.
Claim 14
Independent Claim
79 words
A method of reducing installation forces in the prestressed fastening of layers of aluminum over titanium which comprises the steps of: providing a tapered bore having a given degree of taper through the layers of aluminum and titanium; selecting a tapered bolt having a given degree of taper that is less than the degree of taper on the bore; and then inserting the selected bolt into said bore until permanent deformation of the tapered bore surface has taken place.
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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) | 1993-12-03 | 1994-06-04 | 1994-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-03 | 1998-06-04 | 1998-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-03 | 2002-06-04 | 2002-12-04 | $7700.00 | Window Closed / Lapsed |