| 摘要 |
The present invention relates to a boring head and a roller cutter and a saddle intended to be used by a boring head for rotary drilling of the front in earth and rock formations. The boring head comprises a body with a mounti ng surface for carrying a saddle (15) that holds a roller cutter (14). The roll er cutter (14) is provided with rows of crushing means rotatable relative to a center line and relative to a shaft provided with two shaft spigots (35), ea ch spigot having a second support surface (36) provided for co-operation with a first support surface (23) of the saddle such to hold the roller cutter to t he saddle (15). Each shaft spigot is provided with a hole receiving a fastening means (43) that intersects the second support surface, which fastening means (43) is provided to connect the shaft spigot (35) to the saddle. The first support surface (23) and the second support surface (36) are curved. The fir st support surface (23) and the second support surface (36) connect directly or indirectly to means (25, 40) for counteracting rotation of the shaft. The fastening means (43) is provided to hold the means (25, 40) together.</SDOAB >
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