Fastening systems for parts that endure high vibration shear loads have traditionally been difficult or expensive to produce. This application describes a fastening system with multiple conical surfaces and eccentric offsets. The novel conical fastener system allows parts to be assembled with reduce
Fastening systems for parts that endure high vibration shear loads have traditionally been difficult or expensive to produce. This application describes a fastening system with multiple conical surfaces and eccentric offsets. The novel conical fastener system allows parts to be assembled with reduced tolerance controls at interface features while improving alignment precision. The eccentric conical fastening system is particularly well suited for assemblies with high shear loads in high vibration/shock environments, and/or for systems that have extremely precise pointing requirements.
대표청구항▼
What is claimed is: 1. A precision adjustment joint fastening system comprising: a. a first element, said first element comprises: i. a first element top surface; ii. a first element bottom surface, wherein said bottom surface is parallel to said top surface; iii. an outer surface comprising a firs
What is claimed is: 1. A precision adjustment joint fastening system comprising: a. a first element, said first element comprises: i. a first element top surface; ii. a first element bottom surface, wherein said bottom surface is parallel to said top surface; iii. an outer surface comprising a first conical surface having a first constant angle between said first element top surface and said first element bottom surface, the diameter of said first conical surface decreasing between said first element top surface and said first element bottom surface, wherein said first conical surface has a first conical center axis normal to said first element top surface and said first element bottom surface; and iv. a through bore comprising a second conical surface having a second constant angle between said first element top surface and said first element bottom surface, the diameter of said second conical surface decreasing between said first element top surface and said first element bottom surface, wherein said first constant angle is different from said second constant angle, wherein said second conical surface has a second conical center axis that is parallel to said first conical center axis, and said second conical center axis is offset from said first conical center axis; b. a second element, wherein said second element comprises: i. a second element top surface; ii. a second element bottom surface, wherein said second element top surface is parallel to said second element bottom surface; iii. an outer conical surface having said second constant angle between said second element top surface and said second element bottom surface, wherein said outer conical surface has an outer conical center axis normal to said second element surfaces; and iv. a first through hole, wherein said first through hole is through said second element top surface and said second element bottom surface, wherein said through hole is offset from said outer conical center axis, and said through hole is parallel to said outer conical center axis; c. torque reaction features disposed on said first element top surface and said second element top surface, wherein said torque reaction features comprise at least two surfaces parallel to said conical center axes, wherein said torque reaction features enable precision positioning about said center axes, and holding of said first element and said second element in a desired position about said axes while securing said joint fastening system; d. a first fixed part, wherein said first fixed part comprises; i. a first fixed part top surface; ii. a first fixed part bottom surface; and iii. a through bore comprising a first fixed part conical surface having said first constant angle between said first fixed part top surface and said first fixed part bottom surface; the diameter of said first fixed part conical surface decreasing between said first fixed part top surface and said first fixed part bottom surface, e. a part for fixing, wherein said part for fixing is fixedly attached to said first fixed part, said part for fixing comprises: i. a part for fixing top surface; ii. a part for fixing bottom surface; and iii. a mounting hole extending between said part for fixing top surface and said part for fixing bottom surface; f. a joint fastener; g. a torque limiting element abutting said second element top surface for preventing rotation between said first and second elements, said torque limiting element comprising a threaded through hole for engaging said joint fastener and face that enable a moment to be applied to said torque limiting element; and h. a threaded nut abutting said torque limiting element and engaging said joint fastener; wherein said first conical surface of said first element is matingly received within said first fixed part conical surface, and said outer conical surface of said second element is matingly received within said first element second conical surface, and said joint fastener is disposed through said thread nut, said torque limiting element and said first through hole of said second element and extends through said first fixed part to said mounting hole of said part for fixing, said first fixed part bottom surface abutting said part for fixing top surface, wherein said second element is precisely positioned in said first element using said torque reaction features, whereby said joint fastener is tightened between said second element top surface and said part for fixing bottom surface while said second element is held stationary using said torque reaction feature; wherein said first constant angle comprises a half cone angle greater than 8 degrees for providing a frictionally non-locking connection between said first and second elements, providing for easy disassembly when said joint fastener is released; and wherein said second constant angle comprises a half cone angle in the range of 0 to 8 degrees for providing a frictionally locking connection between said first and second elements when said joint fastener is tightened to a desired torque. 2. The system of claim 1, wherein said first constant angle conical surfaces have half cone angles in a range of 7 to 8 degrees. 3. The system of claim 1, wherein said torque reaction features comprise depressions. 4. The system of claim 1, wherein said torque reaction features comprise raised features. 5. The system of claim 1, wherein said torque reaction features comprise slotted features. 6. The system of claim 1, wherein said torque reaction features comprise one or more faces, whereby said faces are substantially perpendicular to said top surfaces of said first and second elements, whereas said faces are substantially parallel to an axis of said outer conical surface of said second element. 7. The system of claim 1, wherein said mounting hole is selected from a group consisting of a threaded bore hole, a threaded through hole and an unthreaded through hole. 8. The system of claim 1, wherein said joint fastener is selected from a group consisting of a threaded bolt and a threaded shaft.
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