G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 23/16 (2006.01) F16F 7/08 (2006.01) F16F 15/04 (2006.01)
Patent
CA 2453468
A bolt flange is provided with parallel grooves across its surface. One bolt flange surface has grooves that run in a vertical direction, while a second bolt flange surface has grooves that run in a horizontal direction, such that they are perpendicular to the grooves of the first bolt flange mating surface. The purpose of the grooves is to create a surface that consists of flexures. These flexures cause two effects to occur at the bolted interface. First, for a given clamping force, the resulting surface is greater because of the smaller contact area at the interface which in tum increases the friction force. Second, the flexures are sufficiently flexible enough to bend and not slide as the two interface surfaces move relative to each other. The flexure points may different configurations, i.e. squares, circles, triangles, or other geometric shapes. The grooving of the surfaces allows a designer of optical instruments to be capable of determining the stiffness of the resulting flexure as well as control the percentages of forces that are transferred across an interface through friction as compared with elastic bending. The flexured interface also allows the designer to invoke load path management design rules. In summary, load path management is a process by which a designer can control the effect of friction by not effecting the frictional mechanisms, but by changing the elastic stiffness that surrounds the frictional element. Placing grooves in the interface mating surfaces enables a designer to model the interface stiffness as a series of bending beams, which in turn allows the designer to explicitly model the percentage of force that acts through friction.
Goodrich Corporation
Sim & Mcburney
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