초록 ▼

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

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.

대표청구항 ▼

A hand-powered tool for use with a conventional jackhammer tool bit to deliver high impact axial blows to said bit, said bit being of the type including a noncylindrical upper blow-receiving shank, a blow-transmitting working end, and an integral annular protrusion between said upper shank and said

A hand-powered tool for use with a conventional jackhammer tool bit to deliver high impact axial blows to said bit, said bit being of the type including a noncylindrical upper blow-receiving shank, a blow-transmitting working end, and an integral annular protrusion between said upper shank and said working end, said protrusion being spaced from the upper end of said bit by the axial length of said upper shank, said hand-powered tool comprising: an impact rod, said rod having a length of the order of two feet or greater and a diameter of the order of one inch or greater, said rod being comprised of impact-resistant heavy material such as steel to have a weight of the order of ten pounds, and said rod including a hand grippable upper end and a lower end shaped for impacting the upper end of said bit, a tubular guide member, said member including a bit guiding surface comprising a noncylindrical interior surface shaped to telescopically receive and thereby prevent rotation of said noncylindrical upper shank of said bit, said bit guiding surface extending upward from a lower end of said member by a length less than said length of said bit shank, so that when said bit is installed in the lower end of said member, with said bit protrusion resting against said lower end of said member, the shank protrudes above said bit guiding surface, a rod guiding surface comprising a cylindrical interior surface sized to telescopically receive said rod, said rod guiding surface extending downward from an upper end of said member and merging with said bit guiding surface and said rod guiding surface being shorter axially than said rod so that said hand grippable upper end protrudes from said guide member when said rod is installed and its lower end bears upon said bit, and restraint means for retaining said bit within said guide member, said restraint means including an element suitable for connection to the lower end of said guide member and to said bit at a location below said protrusion.