Device for cutting ovals in mats or glass sheets

Claim 1

A device for cutting ovals or circles in sheet material, including in combination: a baseboard, a separate base plate adjacent to a first end of said baseboard, hold-down means swivel mounted to said base plate and having a swivel-mounted hold-down pad, a tee bar having a scaled flat shank portion slidably mounted centrally to said base plate for movement over said baseboard toward a second end thereof and having a crossbar with a center index line, upright frame support means rigidly secured to said said base plate, a horizontal frame having parallel side members and parallel cross members, first horizontal shaft means rigidly secured to said side members and extending across them, second horizontal shaft means rigidly secured to said cross members and bridging them in a direction perpendicular to a vertical plane through said first shaft means and at a different level, a first slide block for said first shaft means and a second slide block for said second shaft means, an upper bar holder in between said upper and lower slide blocks, a lower bar holder below the lower of said slide blocks, two vertical shafts offset from each other, a first said vertical shaft being rigidly secured to said upper bar holder and journaled through the upper of said slide blocks and having a lever arm and handle secured to its upper end, a second said vertical shaft being rigidly secured to both said slide blocks and rotatably journaled through said lower slide block, a horizontal cutter holder bar mounted slidably in said lower bar holder and having means for setting the minor diameter of the oval to be cut and having cutting means, and a horizontal eccentricity-setting bar mounted slidably in said upper bar holder and having means for setting the eccentricity, i.e., the amount by which the major diameter of the oval exceeds the minor diameter.

Claim 2

A device for cutting ovals or circles in sheet material, including in combination: a baseboard, a separate base plate adjacent to a first end of said baseboard, hold-down means swivel mounted to said base plate and having a swivel-mounted hold-down pad, a tee bar having a scaled flat shank portion slidably mounted centrally to said base plate for movement over said baseboard toward a second end thereof and having a crossbar with a center index line, upright frame support means rigidly secured to said said base plate, a horizontal frame having parallel side members and parallel cross members, first horizontal shaft means rigidly secured to said side members and extending across them, second horizontal shaft means rigidly secured to said cross members and bridging them in a direction perpendicular to a vertical plane through said first shaft means and at a different level, a first slide block for said first shaft means and a second slide block for said second shaft means, an upper bar holder in between said upper and lower slide blocks, a lower bar holder below the lower of said slide blocks, two vertical shafts offset from each other, a first said vertical shaft being rigidly secured to said upper bar holder and journaled through the upper of said slide blocks and having a lever arm and handle secured to its upper end, a second said vertical shaft being rigidly secured to both said slide blocks and rotatably journaled through said lower slide block, a horizontal cutter holder bar mounted slidably in said lower bar holder and having means for setting the minor diameter of the oval to be cut and having cutting means, and a horizontal eccentricity-setting bar mounted slidably in said upper bar holder and having means for setting the eccentricity, i.e., the amount by which the major diameter of the oval exceeds the minor diameter.

Claim 7

A device for cutting ovals or circles in sheet material, including in combination: a baseboard, upright frame support means rigidly secured adjacent one end of said baseboard, a horizontal frame having parallel side members and parallel cross members, first horizontal shaft means rigidly secured to said side members and extending across them, second horizontal shaft means rigidly secured to said cross members and bridging them in a direction perpendicular to a vertical plane through said first shaft means and at a different level, a first slide block for said first shaft means and a second slide block for said second shaft means, an upper bar holder in between said upper and lower slide blocks, a lower bar holder below the lower of said slide blocks, two vertical shafts offset from each other, a first said vertical shaft being rigidly secured to said upper bar holder and journaled through the upper of said slide blocks and having a lever arm and handle secured to its upper end, a second said vertical shaft being rigidly secured to both said slide blocks and rotatably journaled through said lower slide block, a horizontal cutter holder bar mounted slidably in said lower bar holder for setting the minor diameter of the oval to be cut and having cutting means, and a horizontal eccentricity-setting bar mounted slidably in said upper bar holder for setting the eccentricity, i.e., the amount by which the major diameter of the oval exceeds the minor diameter.

Claim 8

A device for cutting ovals or circles in sheet material, including in combination: a baseboard, upright frame support means rigidly secured adjacent one end of said baseboard, a horizontal frame having parallel side members and parallel cross members, first horizontal shaft means rigidly secured to said side members and extending across them, second horizontal shaft means rigidly secured to said cross members and bridging them in a direction perpendicular to a vertical plane through said first shaft means and at a different level, a first slide block for said first shaft means and a second slide block for said second shaft means, an upper bar holder in between said upper and lower slide blocks, a lower bar holder below the lower of said slide blocks, two vertical shafts offset from each other, a first said vertical shaft being rigidly secured to said upper bar holder and journaled through the upper of said slide blocks and having a lever arm and handle secured to its upper end, a second said vertical shaft being rigidly secured to both said slide blocks and rotatably journaled through said lower slide block, a horizontal cutter holder bar mounted slidably in said lower bar holder for setting the minor diameter of the oval to be cut and having cutting means, and a horizontal eccentricity-setting bar mounted slidably in said upper bar holder for setting the eccentricity, i.e., the amount by which the major diameter of the oval exceeds the minor diameter.

Claim 13

A device for cutting ovals in sheet material, including in combination: a baseboard, a base plate adjacent to a first end of said baseboard, a pair of hold-down arms swivel mounted to said base plate adjacent opposite sides thereof, each hold-down arm having a distal end, a hold-down pad swivel mounted to each said distal end, adjustable spring means for urging each said pad toward said baseboard to provide yieldable means for holding a sheet of material firmly in position on said baseboard, a tee bar having a scaled flat shank portion slidably mounted centrally to said base plate for movement over said baseboard toward a second end thereof and having a crossbar with a center index line, means for locking said tee bar to said base plate in any desired position, upright frame support means rigidly secured to said base plate, a horizontal frame having parallel side members and parallel cross members, first horizontal shaft means rigidly secUred to said side members and extending across them, second horizontal shaft means rigidly secured to said cross members and bridging them in a direction perpendicular to a vertical plane through said first shaft means and at a different level, a first slide block for said first shaft means and a second slide block for said second shaft means, an upper bar holder in between said upper and lower slide blocks, a lower bar holder below the lower of said slide blocks, two vertical shafts offset from each other, a first said shaft being rigidly secured to said upper bar holder and journaled through the upper of said slide blocks and having a lever arm and handle secured to its upper end, a second said shaft being rigidly secured to both said slide blocks and rotatably journaled through said lower slide block, a horizontal cutter holder bar mounted slidably in said lower bar holder and having a scale set for the minor diameter of the oval to be cut, means for clamping said cutter holder bar to said lower bar holder at any desired position, a cutter assembly secured to said cutter holder bar and having a knife blade, adjustable spring means for urging said blade toward said baseboard, a horizontal eccentricity-setting bar mounted slidably in said upper bar holder and scaled for indicating the eccentricity, i.e., the amount by which the major diameter of the oval exceeds the minor diameter, and means for clamping said eccentricity-setting bar at any desired position.

Claim 14

A device for cutting ovals in sheet material, including in combination: a baseboard, a base plate adjacent to a first end of said baseboard, a pair of hold-down arms swivel mounted to said base plate adjacent opposite sides thereof, each hold-down arm having a distal end, a hold-down pad swivel mounted to each said distal end, adjustable spring means for urging each said pad toward said baseboard to provide yieldable means for holding a sheet of material firmly in position on said baseboard, a tee bar having a scaled flat shank portion slidably mounted centrally to said base plate for movement over said baseboard toward a second end thereof and having a crossbar with a center index line, means for locking said tee bar to said base plate in any desired position, upright frame support means rigidly secured to said base plate, a horizontal frame having parallel side members and parallel cross members, first horizontal shaft means rigidly secUred to said side members and extending across them, second horizontal shaft means rigidly secured to said cross members and bridging them in a direction perpendicular to a vertical plane through said first shaft means and at a different level, a first slide block for said first shaft means and a second slide block for said second shaft means, an upper bar holder in between said upper and lower slide blocks, a lower bar holder below the lower of said slide blocks, two vertical shafts offset from each other, a first said shaft being rigidly secured to said upper bar holder and journaled through the upper of said slide blocks and having a lever arm and handle secured to its upper end, a second said shaft being rigidly secured to both said slide blocks and rotatably journaled through said lower slide block, a horizontal cutter holder bar mounted slidably in said lower bar holder and having a scale set for the minor diameter of the oval to be cut, means for clamping said cutter holder bar to said lower bar holder at any desired position, a cutter assembly secured to said cutter holder bar and having a knife blade, adjustable spring means for urging said blade toward said baseboard, a horizontal eccentricity-setting bar mounted slidably in said upper bar holder and scaled for indicating the eccentricity, i.e., the amount by which the major diameter of the oval exceeds the minor diameter, and means for clamping said eccentricity-setting bar at any desired position.

Claim 20

A device for cutting ovals in sheet material, including in combination: a parallel pair of base channels, a baseboard secured atop said channels by a plurality of screws with elastomeric grommets between said baseboard and said channels, so that loosening and tightening said screws results in compressing or releasing said grommets and thereby adjusting the upper surface of said baseboard, a base plate secured to the upper surface of said channels at one end of said baseboard, a pair of hold-down arms swivel mounted at one end to said base plate adjacent opposite ends thereof, each hold-down arm having a distal end, a hold-down pad swivel mounted to each said distal end, adjustable spring means for urging each said pad toward said baseboard to provide yieldable means for holding a sheet of material firmly in position on saId baseboard, a tee bar having a scaled flat shank portion slidably mounted centrally on said base plate for movement over said baseboard toward the end thereof opposite said base plate and having a crossbar at the end of said shank that lies above said baseboard, said crossbar having a center index line, means for locking said tee bar to said base plate in any desired position, a pair of upright frame members rigidly secured to said base plate at their lower ends, a pair of horizontal frame members having a rear end rigidly secured to an upper portion of said upright frame members and extending forward thereof over and spaced up from said baseboard, horizontal cross members rigidly secured to both said frame members and bracing them, upper horizontal shaft means rigidly secured to said frame members and extending across them, a pair of lower horizontal shafts rigidly secured to said cross members and bridging them in a fore-and-aft direction perpendicular to a vertical plane through said upper shaft means, an upper slide block slidably mounted on said upper shaft means, a lower slide block slidably mounted on said lower shafts, an upper bar holder in between said upper and lower slide blocks, a first vertical shaft rotatably journaled in said upper slide block and non-rotatably secured to said upper bar holder and having a lever arm and handle secured to its upper end over said upper slide block, a lower bar holder below said lower bearing portion, a second vertical shaft offset from said first vertical shaft and non-rotatably secured to said upper and lower bar holders and rotatably journaled in said lower slide block, a horizontal cutter holder bar slidably mounted in said lower bar holder and having a scale indexed to said lower bar holder and set for the minor diameter of the oval to be cut, means for fixing said cutter holder bar to said lower bar holder at any desired position, a cutter assembly secured to an outer end of said cutter holder bar and having a knife blade, adjustable spring means for urging said blade toward said baseboard, a horizontal eccentricity-setting bar slidably mounted in said upper bar holder and scaled for indicating the eccentricity, i.e., the amount by which the major diameter of the oval exceeds the minor diameter, and means for fixing said eccentricity-setting bar to said upper bar holder at any desired position.

Claim 21

A device for cutting ovals in sheet material, including in combination: a parallel pair of base channels, a baseboard secured atop said channels by a plurality of screws with elastomeric grommets between said baseboard and said channels, so that loosening and tightening said screws results in compressing or releasing said grommets and thereby adjusting the upper surface of said baseboard, a base plate secured to the upper surface of said channels at one end of said baseboard, a pair of hold-down arms swivel mounted at one end to said base plate adjacent opposite ends thereof, each hold-down arm having a distal end, a hold-down pad swivel mounted to each said distal end, adjustable spring means for urging each said pad toward said baseboard to provide yieldable means for holding a sheet of material firmly in position on saId baseboard, a tee bar having a scaled flat shank portion slidably mounted centrally on said base plate for movement over said baseboard toward the end thereof opposite said base plate and having a crossbar at the end of said shank that lies above said baseboard, said crossbar having a center index line, means for locking said tee bar to said base plate in any desired position, a pair of upright frame members rigidly secured to said base plate at their lower ends, a pair of horizontal frame members having a rear end rigidly secured to an upper portion of said upright frame members and extending forward thereof over and spaced up from said baseboard, horizontal cross members rigidly secured to both said frame members and bracing them, upper horizontal shaft means rigidly secured to said frame members and extending across them, a pair of lower horizontal shafts rigidly secured to said cross members and bridging them in a fore-and-aft direction perpendicular to a vertical plane through said upper shaft means, an upper slide block slidably mounted on said upper shaft means, a lower slide block slidably mounted on said lower shafts, an upper bar holder in between said upper and lower slide blocks, a first vertical shaft rotatably journaled in said upper slide block and non-rotatably secured to said upper bar holder and having a lever arm and handle secured to its upper end over said upper slide block, a lower bar holder below said lower bearing portion, a second vertical shaft offset from said first vertical shaft and non-rotatably secured to said upper and lower bar holders and rotatably journaled in said lower slide block, a horizontal cutter holder bar slidably mounted in said lower bar holder and having a scale indexed to said lower bar holder and set for the minor diameter of the oval to be cut, means for fixing said cutter holder bar to said lower bar holder at any desired position, a cutter assembly secured to an outer end of said cutter holder bar and having a knife blade, adjustable spring means for urging said blade toward said baseboard, a horizontal eccentricity-setting bar slidably mounted in said upper bar holder and scaled for indicating the eccentricity, i.e., the amount by which the major diameter of the oval exceeds the minor diameter, and means for fixing said eccentricity-setting bar to said upper bar holder at any desired position.