| 摘要 |
A universal housing extension adapted to be coupled to the front end of a wide variety of known drills having different sizes and configurations for securing the housing extension fixed to the housing. A mandrel (62) is received in a chuck (12) of a power drill with the mandrel (62) carrying a thrust bushing (58) which is secured on the mandrel (62) against movement forwardly on the mandrel. A sleeve member is provided to be sandwiched between a rearwardly directed surface on the bearing and a forwardly directed surface on the housing of the drill so as to cause the sleeve member to frictionally engage to the housing against movement relative to the housing.
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