Cutter assembly and hedge trimmer
A cutter assembly for a hedge trimmer includes lower and upper cutters in a longitudinal structure having a longitudinal axis and overlapping each other along a first direction perpendicular to the longitudinal axis. The lower and upper cutters slide relative to each other along a second direction parallel to the longitudinal axis. Each of the lower and upper cutters has a cutter main body and a plurality of cutting edges protruding from the cutter main body along a third direction perpendicular to the longitudinal axis. The cutter main body of the lower cutter has an inner circumferential face enclosing an elongated hole. The elongated hole penetrates the cutter main body. The inner circumferential face is configured with first to fourth sides. The first side of the inner circumferential face has a protrusion protruding toward the second side of the inner circumferential face.
1 . A cutter assembly for a hedge trimmer comprising:
a lower cutter and an upper cutter, each of the lower cutter and the upper cutter being a longitudinal structure and having a longitudinal axis, the lower cutter and the upper cutter overlapping each other along a first direction perpendicular to the longitudinal axis of the lower cutter, the lower cutter and the upper cutter being configured to slide relative to each other along a second direction parallel to the longitudinal axis of the lower cutter, wherein
each of the lower cutter and the upper cutter has:
a cutter main body; and
a plurality of cutting edges protruding from the cutter main body along a third direction perpendicular to the longitudinal axis of each of the lower and upper cutters,
the cutter main body of the lower cutter has an inner circumferential face, and the inner circumferential face encloses an elongated hole,
the elongated hole penetrates the cutter main body of the lower cutter, and the first direction is a penetration direction of the elongated hole and perpendicular to each of the second and third directions,
the elongated hole elongates along the second direction,
the inner circumferential face is configured with first and second sides facing each other and third and fourth sides facing each other, and each of the first and second sides is longer than each of the third and fourth sides,
the elongated hole is exposed to an outside of the cutter assembly, and
the first side of the inner circumferential face has a branch removal protrusion protruding toward the second side of the inner circumferential face.
2 . The cutter assembly according to claim 1 , wherein
a length along the second direction of the elongated hole exceeds a relative sliding distance between the lower cutter and the upper cutter.
3 . The cutter assembly according to claim 1 , wherein
the protrusion protrudes substantially parallel to the third direction.
4 . The cutter assembly according to claim 1 , wherein
the protrusion has a shape of a triangle in a plan view of the cutter assembly.
5 . The cutter assembly according to claim 4 , wherein
the triangle has an obtuse angle at its at an apex of the triangle.
6 . The cutter assembly according to claim 4 , wherein
a distance, along the second direction, between the third side of the inner circumferential face of the elongated hole and the apex of the triangle is equal to or less than a relative sliding distance between the lower cutter and the upper cutter.
7 . The cutter assembly according to claim 1 , wherein
another protrusion protrudes from a first position of an outer circumference face of the cutter main body of the lower cutter along the third direction, and the first position is located between two adjacent cutting edges of the plurality of cutting edges.
8 . The cutter assembly according to claim 1 , wherein
the cutter assembly has a single-edged configuration with the plurality of cutting edges of each of the lower cutter and the upper cutter protruding to only one side of the cutter main body.
9 . The cutter assembly according to claim 1 , wherein
the cutter assembly has a double-edged configuration with the plurality of cutting edges of each of the lower cutter and the upper cutter protruding to both sides of the cutter main body.
10 . The cutter assembly according to claim 1 , further comprising a cutter support on a lower side of the lower cutter, the lower side facing away from the upper cutter, the cutter support covering part of the lower cutter, and
the protrusion is disposed in an area, which is not covered by the cutter support, of the cutter main body of the lower cutter.
11 . A hedge trimmer comprising:
the cutter assembly according to claim 1 ;
a power source configured to cause the lower cutter and the upper cutter of the cutter assembly to slide relatively to each other along the second direction.