RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). SECURITY AGREEMENT Assignors: USGI MEDICAL, INC. Priority claimed from PCT/US2005/020349 external-priority patent/WO2005122914A2/en Publication of US20050277983A1 publication Critical patent/US20050277983A1/en Application granted granted Critical Publication of US7695493B2 publication Critical patent/US7695493B2/en Assigned to ALTA PARTNERS II, INC. Assignors: SAADAT, VAHID, EWERS, RICHARD C., MAAHS, TRACY D., KHAIRKHAHAN, ALEX, MICHLITSCH, KENNETH J. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority to US10/865,736 priority Critical patent/US7695493B2/en Application filed by USGI Medical Inc filed Critical USGI Medical Inc Assigned to USGI MEDICAL INC. Original Assignee USGI Medical Inc Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) ( en Inventor Vahid Saadat Richard Ewers Tracy Maahs Alex Khairkhahan Kenneth Michlitsch Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Granted Application number US10/865,736 Other versions US7695493B2 Google Patents US20050277983A1 - System for optimizing anchoring force While most bolt torque charts use this formula, these are only estimates, and since conditions can vary in real world applications, torque charts and this formula should be used only as a guide.US20050277983A1 - System for optimizing anchoring force Lubricated with wax, oil or other coating = 0.10 The K factor can vary depending on the condition of the threaded fasteners. T = (K D P)/12 can be used to developt a torque value that will achieve a certain tension or clamp load. The Torque/Tension Equation is a method used to estimate the torque/tension relationship in an assembly. Because of these variables, tightening to a specific torque setting can create varied results in the field or on the assembly line. Some of these factors include surface texture, rust, oil, debris, material type, locking elements and human error. Though the relationship between torque and tension is linear, many other factors can affect this relationship. If a bolt is like a spring and more torque equals more tension, why doesn’t a certain amount of torque always result in the same amount of tension? The higher the torque applied to the fastener, the more tension is created as the bolt stretches. Put another way:Ī bolt can stretch similar to a spring, as it becomes tightened once all the parts of the assembly are brought together. Tension is the force that actually holds an assembly together. ![]() Torque is the measurement of twisting force needed to thread the fasteners together. Torque is an indirect indicator of Tension. ![]() Measuring torque alone, however, does not ensure a proper installation. Or, as one senior technician calls it “The One Grunt or Two Grunts Method”. Using calibrated torque tools to tighten fasteners and apply that clamp force is far superior to going by the user’s judgement or feeling.
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