| 摘要 |
A tool (10, 110, 210, 310) for working a medium such as soil comprising a rearward attachment portion (14, 114, 214, 314) connected to a forward working portion (12, 112, 212, 312) which terminates in a tip (24, 124, 224, 324). The tool has upper (20, 120, 220, 320) and lower (30, 130, 230, 330) surfaces and at least one leading edge (22, 122, 222, 322) having a recess (32, 132, 232, 332) located therein. A further at least one recess or depression (42, 142, 242, 342) is provided in the upper surface (20, 120, 220, 320) of the tool which in use collects soil and forms a wearing surface to reduce wear on the upper surface (20, 120, 220, 320). In a preferred form of the invention, the lower surface of the working portion (12, 112, 212, 312) has a channel extending rearwardly from the front tip (24, 124, 224, 324) of the tool to the rearward attachment portion. The channel in the lower surface of the tool assists in reducing the draught forces required to advance the tool through the medium and penetration of the tool within the medium. |
