Bar for a power chain saw

Details Bar for a power chain saw Bar for a power chain saw

B - Operations, Transporting

27

B

143/9

B27B 17/00 (2006.01) B27B 17/02 (2006.01)

Patent

CA 1173330

patent disclosure A "critical damped" BAR FOR A POWER CHAIN SAW by William Cumming Leith, a Canadian citizen residing at Box 157, Trail, B.C. VlR 4L4 ABSTRACT A "critical damped" bar for a power chain saw would use maximum energy efficiency for wood cutting, but dampen out up to 95% of the wasted energy going to the vibrations at the hand- grip, thus cutting wood efficiently while preventing the occu- pational hazard, "vibration white finger," a problem common to tree fallers, especially in B.C. A resonant wood-cutting mode with minimum energy input, near the free end of the chain saw bar, utilizes a family of resonant harmonic vibrations (n=1,2,3, etc.) corresponding to the natural frequencies of the bar, chain links, chain speed, sprocket rpm, and tree diameter. A Helmholtz resonator model for the chain cutter teeth, wood chip, tree interface is combined with a vibrating string model for the chain resonant harmonic vibrations, to establish a non resonant chain bar, which dampens out up to 95% of the wasted energy going to the vibrations of the fixed end of the bar, chain, engine hand-grip. References 1. D. Rockwell et al, "Self Sustaining Oscillations of Flow Past Cavities," ASME Jour Fluid Eng (vol. 100, no. 2, June 78). 2. F.R. Archibald et al, "Vibration of a String," ASME Jour App Mech (1958).

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