| 摘要 |
A lopper 10 used to perform lopping, pruning and similar operations includes a lopping head 12 provided with a spring-biased blade (18 Fig 4) cooperating with a jaw (20 Fig 6), a drive mechanism 16 , and an elongate housing 1. The drive mechanism 16 includes first and second wheels 30, 46 rotatable relative thereto about a first axis (32). A head line 34 couples the first wheel 30 to the blade 18 at a connecting point (42 Fig 4), and the second wheel (46 Fig 9) is coupled to a driving line 48. The first wheel 30 is eccentric relative to the wheel 46 so that a distance separating a region of a guiding surface (82 Fig 9) of the first wheel 30 form the first axis 32 is smallest at a predetermined point of blade travel across the bight (22 Fig 4). The lopper also includes an intermediate handle (74 Fig 13) and a lower handle (78 Fig 13) selectively operable to actuate the blade 18 relative to the jaw (20 Fig 6). |
