Tool for cutting rectilinear openings for electrical outlet boxes in sheet material
First Claim
1. A tool for cutting rectangular holes in sheet material for access to the orifices of electrical junction boxes underlying the sheet material, comprising in combination:
- a body rotatably carrying a drive shaft having first and second ends extending spacedly from the body, the first end of the drive shaft having means for interconnection with a powering source to provide rotary motion to the drive shaft;
first and second saw blade plates each articulatedly carried by the body in spaced overlying relationship about the second end portion of the drive shaft, each saw blade plate carrying a pair of similar parallel spaced saw blades extending away from the body, with the pair of saw blades carried by the first saw blade plate perpendicular to the pair of saw blades carried by the second saw blade plate and each pair of saw blades having a length less than the distance between the perpendicular pair of saw blades;
mechanical linkage communicating between the second end of the drive shaft and the first and second saw blade plates having means for translating rotary motion of the drive shaft into linear component motions to move each saw blade plate in lineally reciprocating motion parallel to the pair of saw blades carried thereby.
1 Assignment
0 Petitions
Accused Products
Abstract
A cutting tool and associated positioning templates locate and cut rectangular junction box holes in dry wall or similar sheet material forming structural surfaces. Templates defining a medial positioning slot and providing a spaced pair of positioning pins are carried by pre-established junction boxes and surface sheeting material is established thereover with the positioning pins projecting through the sheet material to indicate positioning slot location. The tool provides a body articulately carrying two perpendicular pairs of spaced parallel saw blades that are moved reciprocably by spring biased driving linkage to cut rectilinear holes in the sheet material over the junction boxes. The saw blades have arcuate edges defining cutting teeth of opposite pitch on each side of the arcuate edge of the tool to aid positional maintenance and prevent chatter during cutting. A positioning blade carried by the body and extending beyond the saw blades passes through sheet material between the positioning pins and into the positioning orifice of the positioning template for tool positioning. The tool is partially covered by a peripheral casement carried by the body and is powered by an independent powering source positionally maintained by the casement.
45 Citations
14 Claims
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1. A tool for cutting rectangular holes in sheet material for access to the orifices of electrical junction boxes underlying the sheet material, comprising in combination:
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a body rotatably carrying a drive shaft having first and second ends extending spacedly from the body, the first end of the drive shaft having means for interconnection with a powering source to provide rotary motion to the drive shaft; first and second saw blade plates each articulatedly carried by the body in spaced overlying relationship about the second end portion of the drive shaft, each saw blade plate carrying a pair of similar parallel spaced saw blades extending away from the body, with the pair of saw blades carried by the first saw blade plate perpendicular to the pair of saw blades carried by the second saw blade plate and each pair of saw blades having a length less than the distance between the perpendicular pair of saw blades; mechanical linkage communicating between the second end of the drive shaft and the first and second saw blade plates having means for translating rotary motion of the drive shaft into linear component motions to move each saw blade plate in lineally reciprocating motion parallel to the pair of saw blades carried thereby. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A tool for cutting rectangular holes for electrical junction boxes in sheet material established thereover to provide access to orifices of the junction boxes, comprising in combination:
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a rigid body; cutting structure articulatingly carried by the body to extend therefrom including spaced, parallel, overlying saw blade plates, each said saw blade plate carrying a pair of similar spaced parallel saw blades extending spacedly away from the body with one pair of saw blades arrayed perpendicularly to the other pair of saw blades to cut the periphery of a rectangular hole; driving linkage carried by the body including a drive shaft journaled in the body to extend spacedly adjacent the saw blade plates and mechanical means communicating between the drive shaft and the saw blade plates for moving each saw blade plate in limited reciprocal motion parallel to the saw blades carried thereby responsive to rotary motion of the drive shaft. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification