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US 4,580,474 AGranted
Table shear
OwnerClifford J. Bueche, Sr.inventor
Life of this patent
Estimating the term…
Abstract
An improved table shear, and method for using same, for cutting sheet metal in precise dimensions. The table shear includes a hold down clamp in operative engagement with the cutting blade leverage mechanism. The clamp impinges against the sheet metal before the blade begins to cut, thereby preventing movement of the sheet metal during the shearing process. The clamp also protects the operator from the cutting blade during the shearing operation.
Claims16
A method for cutting a metal plate along a desired line of cut, comprising the steps of:
- placing said metal plate atop a table having a table blade connected thereto on one end thereof;
- measuring said metal plate to determine said desired line of cut and positioning said plate accordingly atop said table;
- pressing down on a handle in levered engagement with a cutting blade head having a cutting blade connected thereto, said pressing step driving said cutting blade toward and across said plate, said pressing step applying frictional drag on a clamp to press said clamp against said plate upon driving of said cutting blade toward and across said plate, said pressing step causing a bolt extending through a groove in said clamp to slide downward through said groove toward said plate during said pressing of said clamp against said plate and driving of said cutting blade across said plate, said clamp maintaining said plate in said desired position to permit said table blade and cutting blade to cut said plate along said desired line of cut;
- and
- lifting said handle, thereby lifting said clamp and cutting blade to remove said cut metal plate.
2 more elements
Apparatus for cutting a metal plate along a desired line of cut, comprising:
- a table for receiving said plate thereon;
- a table blade connected to said table;
- a head connected to said table and a cutting blade for driving said cutting blade toward and across said plate;
- a clamp for pressing against said plate prior to and during said driving of said cutting blade across said plate;
- and means for applying frictional drag on said clamp, including a bolt extending through a groove in said clamp, to press said clamp against said plate upon driving of said cutting blade toward and across said plate, said groove in said clamp adapted to permit said bolt to slide downward through said groove toward said plate during said pressing of said clamp against said plate and driving of said cutting blade across said plate, said clamp maintaining said metal plate in a desired position atop said table to permit said cutting blade and table blade to cut said plate along said desired line of cut.
2 more elements
Apparatus for cutting a metal plate along a desired line of cut, comprising:
- a base including a table for receiving said plate thereon;
- a head connected to said base and a cutting blade for driving said cutting blade toward and across said plate;
- a clamp for pressing against said plate prior to and during said driving of said cutting blade across said plate;
- means for applying frictional drag on said clamp, including a bolt extending through a groove in said clamp and a passage in said head, to press said clamp against said plate upon driving of said cutting blade toward and across said plate, said groove in said clamp adapted to permit said bolt to slide downward through said groove toward said plate during said pressing of said clamp against said plate and driving of said cutting blade across said plate, said clamp maintaining said metal plate in a desired position atop said table to permit said cutting blade to cut said plate along said desired line of cut;
- an adjustable mitre in sliding engagement with said table for impinging against said plate prior to and during said cutting of said plate;
- and
- a backstop in geared engagement with at least one extension rod connected to said base for impinging against said plate prior to and during said cutting of said plate, said backstop further comprising a pivotal guide strip adapted for supporting said metal plate.
4 more elements
Dependencies are inferred from the claim text.