| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem wherein a conventional thatching blade for lawn grass has a shape of a blade edge causing the reduction of a sending-out performance according to the abrasion of a blade part because of the decrease of a sending-out angle, and hardly allows being subjected to a partial hardening treatment of the blade part because of an uneven width of the blade, to cause uneconomical rapid abrasion of the blade, to make resistance at the side surfaces of the blade large, and to make power requirement large. SOLUTION: The thatching blade 1 has two or more blade parts 3 radially protruded from a disk-shaped base part 2 arranged at the rotary center part, and the blade part 3 having a blade edge 3a for normal rotation and a blade edge 3b for reverse rotation formed at the both sides in the front and rear direction based on the rotary direction of the blade part 3. A notch is formed so as to be directed from the outer periphery edge between the blade edge 3a for the normal rotation and the blade edge 3b for the reverse rotation in the blade part 3 to the center so that the blade widths of a blade part 3e for the normal rotation and a blade part 3f for the reverse rotation may almost be the same. The blade edge 3a for the normal rotation and the blade edge 3b for the reverse rotation are formed by a curved line or a straight line regulated so that the sending-out angle when being abraded may be nearly constant. COPYRIGHT: (C)2004,JPO
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