10/21/2023 0 Comments Spine align golf clubsWEISS REVOCABLE TRUST, U/A/D ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). WEISS REVOCABLE TRUST, U/A/D reassignment RICHARD M. Weiss Priority to US10/058,107 priority Critical patent/US6550121B2/en Publication of US20020107083A1 publication Critical patent/US20020107083A1/en Application granted granted Critical Publication of US6550121B2 publication Critical patent/US6550121B2/en Assigned to RICHARD M. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority claimed from US13501299P external-priority Application filed by Richard M. Twigg Priority date (The priority date is an assumption and is not a legal conclusion. RICHARD M WEISS REVOCABLE TRUST U/A/D MAY 18 2001 Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Twigg 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.) Expired - Lifetime Application number US10/058,107 Other versions US20020107083A1 Google Patents Method and apparatus for locating and aligning golf club shaft spineĭownload PDF Info Publication number US6550121B2 US6550121B2 US10/058,107 US5810702A US6550121B2 US 6550121 B2 US6550121 B2 US 6550121B2 US 5810702 A US5810702 A US 5810702A US 6550121 B2 US6550121 B2 US 6550121B2 Authority US United States Prior art keywords golf club shaft club shaft distal end orientation Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US6550121B2 - Method and apparatus for locating and aligning golf club shaft spine The work has not been done to quantify where, between these numbers, is the "threshold" of spine importance, but it makes no sense to talk about aligning spine without also talking about the size of the spine.US6550121B2 - Method and apparatus for locating and aligning golf club shaft spine It can be measured in CPM or in percentage difference of spring constant, depending on whether your measuring instruments use frequency or deflection.”ġcpm of frequency or 1% of spring constant is a small or even negligible spine. “The size of the spine in a shaft is a measure of the difference between the stiffness at the spine and the stiffness at the NBP. Remarkably little of the discussion of spine alignment addresses the fact that there are big, serious spines and then there are spines that are probably too small to matter. Let's finish with a definition of the size of the spine. The bend of the shaft at rest - with no flex forces on it - is called the "residual bend". Some shafts are straighter than others, just as some shafts are more symmetrical in stiffness than others. Just as it is impossible to manufacture a perfectly symmetrical shaft, it is impossible to manufacture a perfectly straight shaft. But the welding seam isn't the only cause of spine, nor even the major cause. Actually, the name "spine" originally came from the belief that, since most steel shafts were welded tubes, the seam created an asymmetry in stiffness.
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