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A device for cutting openings having a predetermined shape in a drywall panel includes a housing with a base and an integrally formed side wall extending outwardly from the periphery of the base in a substantially perpendicular fashion. The base and the side wall defining a cavity therebetween. A st

A device for cutting openings having a predetermined shape in a drywall panel includes a housing with a base and an integrally formed side wall extending outwardly from the periphery of the base in a substantially perpendicular fashion. The base and the side wall defining a cavity therebetween. A strike plate is slidably received inside the cavity, and has a shape corresponding to that of the predetermined shape of the opening. The strike plate is movable within the cavity between a normally retracted position, wherein the strike plate is maintained in abutment with the base, and an extended position. A plurality of cutting blades are removably secured to the periphery of the strike plate inside the cavity. Cutting surfaces of the blades cut through the panel to form the opening when the strike plate is moved to its extended position. A strike plug extends from outside the cavity through the base and strike plate into the cavity. The strike plug is secured to the strike plate so that the strike plug moves the strike plate from the retracted position to the extended position when impulsive force is applied to the first end of the strike plug. A return assembly is provided for returning the strike plate to its retracted position after actuation of the cutting device. Ejector posts secured to the base of the housing extend into the cavity to prevent a section of the panel cut by the cutting blades to define the opening from entering the cavity.

대표청구항 ▼

[ I claim:] [1.] A device for cutting openings having a predetermined shape in a panel made of prefabricated material, comprising:a housing including a base and an integrally formed side wall extending outwardly from the periphery of the base in a substantially perpendicular fashion, the base and th

[ I claim:] [1.] A device for cutting openings having a predetermined shape in a panel made of prefabricated material, comprising:a housing including a base and an integrally formed side wall extending outwardly from the periphery of the base in a substantially perpendicular fashion, the base and the side wall defining a cavity therebetween;a strike plate sized to be slidably received inside the cavity, and having a shape corresponding to that of the predetermined shape of the opening, the strike plate being movable within the cavity between a normally retracted position wherein the strike plate is maintained in abutment with the base and an extended position;a plurality of cutting blades removably secured to the periphery of the strike plate inside the cavity, each of the cutting blades having a cutting surfaces extending outwardly from the strike plate, the cutting surfaces being provided for cutting through the panel to form the opening, the cutting surfaces cutting through the panel when the strike plate is moved to its extended position; anda strike plug extending from outside the cavity through the base and strike plate into the cavity, the strike plug including a first end positioned outside of the cavity and a second end positioned inside the cavity, the strike plug being secured to the strike plate, the strike plug moving the strike plate from the retracted position to the extended position when impulsive force is applied to the first end of the strike plug;further including a return assembly for returning the strike plate to its retracted position; andat least two ejector posts secured to the base of the housing and extending through openings formed in the strike plate into the cavity, the ejector posts preventing a section of the panel cut by the cutting blades to define the opening from entering the cavity.