| 摘要 |
An impact tool capable of use in place of a conventional jackhammer, the tool being of the type having an axially moving impact member guided telescopically by a mating guide member, and characterized by the following combination: (a) the impact member is a massive elongated rod, having a length of the order of two feet or greater, a diameter of the order of one inch or greater, and comprised of impact-resistant heavy material such as steel to have a weight of the order of 10 pounds; (b) the guide member is a rigid hollow outer sleeve, having a slidable fit over the massive rod and having a lower end formation of internal shape corresponding to the external shape of the shank of a jackhammer tool bit; (c) a restraint means retains the jackhammer tool bit with its shank inserted into the lower end formation of the guide; and (d) the massive rod and the guide member are cooperatively dimensioned so that the massive rod protrudes to enable a worker to alternately retract the massive rod and propel it against the end of the tool shank.
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