Applying tribological principles to improve the performance of the Hoffmann external fixator's universal joint
| Autor: | Drijber Fl, Finlay Jb |
|---|---|
| Rok vydání: | 1990 |
| Předmět: |
Universal joint
Materials science External fixator External Fixators 0206 medical engineering 02 engineering and technology Models Biological law.invention 03 medical and health sciences 0302 clinical medicine law Torque Friction torque 030222 orthopedics business.industry Mechanical Engineering General Medicine Structural engineering Equipment Design Tribology 020601 biomedical engineering Biomechanical Phenomena Clamp Joints Slippage business Belleville washer |
| Zdroj: | Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine. 204(4) |
| ISSN: | 0954-4119 |
| Popis: | As part of a continuing investigation of sources of slippage in the universal joints of external fixation devices, a study was conducted to determine if selected interfaces of the Hoffmann external fixator (rod/clip torsional, cheek/bowl and clip/cheek) could be improved by moving the point of contact between the wing-nut clamp and cheek closer to the centre of the wing-nut clamp. It was felt that the movement of the point of contact would reduce the magnitude of the frictional torque resisting the tightening of the wing-nut clamp. The point of contact was changed by the addition of a Belleville washer between the interface of the wing-nut clamp and the cheek. Increased slippage torques of approximately 100 per cent were noted in all interfaces at low values of tightening torque (6 and 8 N m) of the wing-nut clamp and improvements of not less than 50 per cent were obtained at higher tightening torques (10 and 12 N m) on the wing-nut clamp. |
| Databáze: | OpenAIRE |
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