| 摘要 |
There is a need for an efficient cutter to cut openings in drywall for electrical switch and outlet boxes. Existing cutters typically press out an opening and consequently require great hand supplied force and use of a back plate which must be positioned behind the wallboard. The invention discloses a chain driven electrical box cutter for cutting a rectangular opening in wallboard which comprises: a housing having a rectangular chain track therearound; a sprocket positioned centrally within the housing; a shaft positioned within and secured to the sprocket having a cutting end projecting forwardly through the housing, and a drive end projecting rearwardly through the housing; a loop of chain positioned within the track and on the sprocket so that it may be driven thereby, said chained carrying cutting teeth adapted to cut in a direction towards the front of the housing; so that when the shaft is turned its cutting end cuts a guide hole in a wallboard, and its chain teeth thereafter cut a shape in the wallboard corresponding to the rectangular chain track.
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