Lopper
AssigneeFiskars Consumer Oy Ab
InventorErkki Olavi Linden
Life of this patent
Estimating the term…
Abstract
A lopper used to perform lopping, pruning and similar operations includes a lopping head provided with a spring-biased blade cooperating with a jaw, a drive mechanism, and an elongate housing. The drive mechanism includes first and second wheels rotatable relative thereto about a first axis. A head line couples the first wheel to the blade at a connecting point, and the second wheel is coupled to a driving line. The first wheel is eccentric relative to the second wheel so that a distance separating a region of a guiding surface of the first wheel from the first axis is smallest at a predetermined point of blade travel across the bight. The lopper also includes an intermediate handle and a lower handle selectively operable to actuate the blade relative to the jaw.
Claims22
A lopper comprising:
- a lopping head having a spring-biased blade pivotally connected to a jaw about a pivot point, the jaw cooperating with the blade to sever a workpiece received in a bight formed by the jaw;
- a drive mechanism connected to the lopping head, the drive mechanism comprising a first wheel rotatable relative thereto about a first axis and coupled to the blade by a head line, the head line being connected to the first wheel at a connecting point so that the head line is wound about a guiding surface of the first wheel as the first wheel rotates about the first axis, the drive mechanism also comprising a second wheel rotatable with the first wheel;
- the second wheel being coupled to a driving line;
- and
- an elongate housing connected to the drive mechanism;
- wherein the first wheel is eccentric relative to the second wheel so that a distance separating the first axis from a region of the guiding surface where the head line ceases to engage the guiding surface is smallest at a predetermined point of blade travel across the bight.
A lopper comprising:
- a hollow elongate housing;
- a drive mechanism connected to the elongate housing;
- and
- a lopping head connected to the drive mechanism, the lopping head having a spring-biased blade cooperating with a jaw to sever a workpiece received in a bight formed by the jaw, the blade being pivotable about a pivot point upon actuation of a head line connecting the blade to the drive mechanism;
- wherein the drive mechanism comprises first and second wheels rotatable relative thereto about a first axis, the second wheel being coupled to a driving line, the head line being connected to the first wheel at a connecting point so that the head line is wound about a guiding surface of the first wheel as the first wheel rotates about the first axis, and the first wheel being eccentric relative to the second wheel so that a distance separating the first axis from a region of the guiding surface where the head line ceases to engage the guiding surface is smallest at a predetermined point of blade travel across the bight.
A lopper, comprising:
- a lopping head having a spring-biased blade pivotally connected to a jaw about a pivot point, the jaw cooperating with the blade to sever a workpiece received in a bight formed by the jaw;
- drive mechanism connected to the lopping head, the drive mechanism comprising a first wheel rotatable relative thereto about a first axis and coupled to the blade by a head line, the head line being connected to the first wheel at a connecting point, the drive mechanism also comprising a second wheel rotatable with the first wheel, the second wheel being coupled to a driving line;
- an elongate housing connected to the drive mechanism;
- and
- means for imparting a variable cutting force to the workpiece as the blade travels across the bight, the variable cutting force increasing to a predetermined point of travel of the blade across the bight when a constant force is applied to the driving line.
Dependencies are inferred from the claim text.