| 摘要 |
A lawn trimmer has a tubular shaft assembly which structurally and drivingly connects an upper power head to a lower rotary tool head in a lawn-trimming tool. The assembly includes a bent portion to dispose its opposite ends at an angle to each other, and comprises an outer frame shaft of relatively large diameter and structural strength and an inner sheath tube of relatively smaller diameter formed of rigid but bendable tubing extending coaxially of the frame tube. The sheath tube is supported over the bent length of the assembly by a continuous semirigid bushing, and its lower end is held coaxial with the lower end of the frame tube by a substantially rigid bushing. The lower end of the frame tube, beyond such rigid bushing, is expanded to form a sleeve of enlarged diameter and predetermined length, and an arbor assembly is mounted in such sleeve and consists of a pair of ball bearings mounted by their inner races on the arbor and having their outer races supportingly received in the sleeve. The outer end of the sleeve is deformed inward to secure the outer races of the spaced ball bearings between themselves and the upper end of the enlargement.
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