US3734156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self locking nuts
Assignee: Firth Cleveland Extrusions Ltd
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Filing: 1970-06-15
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Granted: 1973-05-22
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Expires: 1990-06-15
Abstract
Abstract An all-metal self locking nut with a polygonal nut body, a crown extending from the non-bearing end of the nut body, and a screwthreaded bore extending through the nut body and crown. The crown has a frustoconical surface defined by a straight line revolved around the axis of the nut at a predetermined angle to that axis and extending from the side of the nut body to a region at or near the emergent periphery of the nut bore at the crown. This frustoconical surface is interrupted by an annular ledge or recess preferably produced by an axial punch prior to the threading of the nut bore, and having a flat base extending in a plane parallel to the bearing end of the nut body and perpendicular to the axis of the nut and an inner surface at right angles to the flat base. Subsequent to the threading of the bore, it is deformed inwardly within the crown by symmetrically arranged indentations in the region of the annular ledge or recess. Each of the indentations has in axial section a surface inclined to the nut axis at an angle smaller than the said predetermined angle of the frustoconical surface. The indentations may be produced by an axial die having a plurality of strike surfaces for formation of the indentations with intermediate relieved portions.
Inventors
- 👤 A Beard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:12
CPC Classifications
F; F16; F16B; F16B39/00; F16B39/22; F16B39/28; F16B39/284; B; B21; B21K; B21K1/00; B21K1/64; B21K1/70; B21K1/707
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
245 words
An all-metal self-locking nut having a polygonal nut body, a crown extending from the non-bearing end of the nut body, and a screw-threaded bore extending through the nut body and crown; the improvement comprising in that said crown has a frustoconical surface defined by a straight line revolved around the axis of the nut at a predetermined angle to said axis and extending from the side of the nut body to a region adjacent the emergent periphery of the bore at the crown, in that an annular ledge dividing the crown into an outer crown and an inner upstanding thin nut collar interrupts said frustoconical surface where said ledge has a flat base extending in a plane perpendicular to the axis of the nut and an inner surface extending at right angles to said flat base and along the vertical side of said nut collar, in that said bore is circular within said nut body, and in that a plurality of indentations are positioned symmetrically around the periphery of said crown into the inner surface along the full height of said vertical side and extending outwardly into said flat base where each said indentation has in axial section a surface inclined to the nut axis at an angle smaller than the said predetermined angle whereby said indentations deform the cross section of the bore within said crown radially inwardly to form locking portions connected to the remainder of the nut by regions of reduced thickness.
Claim 2
Dependent Claim
245 words
An all-metal self-locking nut having a polygonal nut body, a crown extending from the non-bearing end of the nut body, and a screw-threaded bore extending through the nut body and crown; the improvement comprising in that said crown has a frustoconical surface defined by a straight line revolved around the axis of the nut at a predetermined angle to said axis and extending from the side of the nut body to a region adjacent the emergent periphery of the bore at the crown, in that an annular ledge dividing the crown into an outer crown and an inner upstanding thin nut collar interrupts said frustoconical surface where said ledge has a flat base extending in a plane perpendicular to the axis of the nut and an inner surface extending at right angles to said flat base and along the vertical side of said nut collar, in that said bore is circular within said nut body, and in that a plurality of indentations are positioned symmetrically around the periphery of said crown into the inner surface along the full height of said vertical side and extending outwardly into said flat base where each said indentation has in axial section a surface inclined to the nut axis at an angle smaller than the said predetermined angle whereby said indentations deform the cross section of the bore within said crown radially inwardly to form locking portions connected to the remainder of the nut by regions of reduced thickness.
Claim 3
Dependent Claim
259 words
An all-metal self-locking nut having a polygonal nut body, a crown extending from the on-bearing end of the nut body and a screw-threaded bore extending through the nut body and crown; the improvement comprising in that said crown has a frustoconical surface defined by a straight line revolved around the axis of said nut at a predetermined angle to said axis and extending from the side of the nut body to a region adjacent the emergent periphery of the bore at the crown, in that an annular ledge dividing the crown into an outer crown and an inner upstanding thin nut collar interrupts said frustoconical surface where said ledge has a flat base extending in a plane perpendicular to the axis of the nut and an inner surface at right angles to said flat base, in that said bore is circular within said nut body, and in that a plurality of indentations are positioned symmetrically around the periphery of said crown in the region of said ledge where each said indentation has in axial section a surface indented into said collar inclined to the nut axis at an angle smaller than said predetermined angle whereby said indentations deform the cross section of the bore within said crown radially inwardly to form locking portions connected to the remainder of the nut by regions of reduced thickness wherein said portions are adapted to act as pressure pads againSt a cooperating bolt and wherein said portions are partially severed from the remainder of the nut collar to increase resillancy of said portions.
Claim 4
Dependent Claim
259 words
An all-metal self-locking nut having a polygonal nut body, a crown extending from the on-bearing end of the nut body and a screw-threaded bore extending through the nut body and crown; the improvement comprising in that said crown has a frustoconical surface defined by a straight line revolved around the axis of said nut at a predetermined angle to said axis and extending from the side of the nut body to a region adjacent the emergent periphery of the bore at the crown, in that an annular ledge dividing the crown into an outer crown and an inner upstanding thin nut collar interrupts said frustoconical surface where said ledge has a flat base extending in a plane perpendicular to the axis of the nut and an inner surface at right angles to said flat base, in that said bore is circular within said nut body, and in that a plurality of indentations are positioned symmetrically around the periphery of said crown in the region of said ledge where each said indentation has in axial section a surface indented into said collar inclined to the nut axis at an angle smaller than said predetermined angle whereby said indentations deform the cross section of the bore within said crown radially inwardly to form locking portions connected to the remainder of the nut by regions of reduced thickness wherein said portions are adapted to act as pressure pads againSt a cooperating bolt and wherein said portions are partially severed from the remainder of the nut collar to increase resillancy of said portions.
Claim 5
Dependent Claim
250 words
An all-metal self-locking nut having a polygonal nut body, a crown extending from the non-bearing end of the nut body and a screw-threaded bore extending through the nut body and crown; the improvement comprising in that said crown has a frustoconical surface defined by a straight line revolved around the axis of said nut at a predetermined angle to said axis and extending from the side of the nut body to a region adjacent the emergent periphery of the bore at the crown, in that an annular ledge dividing the crown into an outer crown and an inner upstanding thin nut collar interrupts said frustoconical surface where said ledge has a flat base extending in a plane perpendicular to the axis of the nut and an inner surface extending at right angles to said flat base, in that said bore is circular within said nut body, and in that a plurality of indentations are positioned symmetrically around the periphery of said crown in the region of said ledge where each said indentation has in axial section a surface indented into said collar inclined to the nut axis at an angle smaller than said predetermined angle and a flat base indented into the flat face of the annular ledge extending in a plane perpendicular to the axis of the nut whereby said indentations deform the cross section of the bore within said crown radially inwardly to form locking portions connected to the remainder of the nut by regions of reduced thickness.
Claim 6
Dependent Claim
250 words
An all-metal self-locking nut having a polygonal nut body, a crown extending from the non-bearing end of the nut body and a screw-threaded bore extending through the nut body and crown; the improvement comprising in that said crown has a frustoconical surface defined by a straight line revolved around the axis of said nut at a predetermined angle to said axis and extending from the side of the nut body to a region adjacent the emergent periphery of the bore at the crown, in that an annular ledge dividing the crown into an outer crown and an inner upstanding thin nut collar interrupts said frustoconical surface where said ledge has a flat base extending in a plane perpendicular to the axis of the nut and an inner surface extending at right angles to said flat base, in that said bore is circular within said nut body, and in that a plurality of indentations are positioned symmetrically around the periphery of said crown in the region of said ledge where each said indentation has in axial section a surface indented into said collar inclined to the nut axis at an angle smaller than said predetermined angle and a flat base indented into the flat face of the annular ledge extending in a plane perpendicular to the axis of the nut whereby said indentations deform the cross section of the bore within said crown radially inwardly to form locking portions connected to the remainder of the nut by regions of reduced thickness.
Claim 7
Dependent Claim
244 words
An all-metal self-locking nut having a polygonal nut body, a crown extending from the non-bearing end of the nut body and a screw-threaded bore extending through the nut body and crown; the improvement comprising in that said crown has a frustoconical surface defined by a straight line revolved around the axis of said nut at a predetermined angle to said axis and extending from the side of the nut body to a region adjacent the emergent periphery of the bore at the crown, in that an annular ledge dividing the crown into an outer crown and an inner upstanding thin nut collar interrupts said frustoconical surface where said ledge has a flat base extending in a plane perpendicular to the axis of the nut and an inner surface extending at right angles to said flat base, in that said bore is circular within said nut body, and in that a plurality of indentations are positioned symmetrically around the periphery of said crown in the region of said ledge where each said indentation has in axial section a surface indented into said collar inclined to the nut axis at an angle smaller than said predetermined angle and a base inclined at an angle corresponding to the helix angle of the thread in the bore whereby said indentations deform the cross section of the bore within said crown radially inwardly to form locking portions connnected to the remainder of the nut by regions of reduced thickness.
Claim 8
Dependent Claim
244 words
An all-metal self-locking nut having a polygonal nut body, a crown extending from the non-bearing end of the nut body and a screw-threaded bore extending through the nut body and crown; the improvement comprising in that said crown has a frustoconical surface defined by a straight line revolved around the axis of said nut at a predetermined angle to said axis and extending from the side of the nut body to a region adjacent the emergent periphery of the bore at the crown, in that an annular ledge dividing the crown into an outer crown and an inner upstanding thin nut collar interrupts said frustoconical surface where said ledge has a flat base extending in a plane perpendicular to the axis of the nut and an inner surface extending at right angles to said flat base, in that said bore is circular within said nut body, and in that a plurality of indentations are positioned symmetrically around the periphery of said crown in the region of said ledge where each said indentation has in axial section a surface indented into said collar inclined to the nut axis at an angle smaller than said predetermined angle and a base inclined at an angle corresponding to the helix angle of the thread in the bore whereby said indentations deform the cross section of the bore within said crown radially inwardly to form locking portions connnected to the remainder of the nut by regions of reduced thickness.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |