US3779116A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shearing apparatus
Assignee: COMFED SAVINGS BANK 45 CENTRAL STREET LOWELL MASSACHUSETTS A CORP OF MASSACHUSETTS
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Filing: 1972-02-16
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Granted: 1973-12-18
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Expires: 1992-02-16
Abstract
Abstract A shearing machine for shearing a workpiece with relatively low power and without attendant curling. The machine includes a pair of knives mounted on a frame with one of the knives being relatively movable toward and away from the other. Also included is a yieldable workpiece support anvil disposed adjacent the stationary blade and below the movable knife for supporting a generally planar workpiece while it is being sheared. The workpiece support anvil is yieldably mounted to effect a constant, even, equal, yield resistance for the anvil in opposition to the movable knife as the workpiece is sheared. One form of such mounting is a pair of piston-cylinder mechanisms supporting the anvil, such mechanisms having suitable control means so that the anvil provides a constant even resistance throughout the shearing operation, thereby preventing curling of the workpiece.
Inventors
- 👤 W Curtis
- 👤 A Mcdaniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:31
CPC Classifications
B; B23; B23D; B23D33/00; B23D33/08; Y; Y10; Y10T; Y10T83/00; Y10T83/202; Y10T83/2092; Y10T83/2198; Y10T83/566; Y10T83/5669; Y10T83/5696; Y10T83/5742; Y10T83/748; Y10T83/7487; Y10T83/7527
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
139 words
A shearing machine for shearing an associated planar workpiece with relatively low power and without attendant curling of the workpiece comprising, a stationary frame, a stationary knife mounted on said frame, a movable knife, movable knife support means mounting said movable knife for movement toward and away from said stationary knife in coacting shearing relation therewith, a workpiece outboard support anvil disposed adjacent said stationary knife and directly below said movable knife in opposition thereto, and anvil mounting means on said frame for yieldably supporting said anvil, said mounting means effecting a constant even equal yield resistance for the anvil as an associated workpiece is sheared thereon by said movable knife in coaction with the stationary knife, said anvil mounting means effecting a two-dimensional yield of the anvil thereby effecting a diminishing rake angle as the workpiece is sheared.
Claim 2
Dependent Claim
139 words
A shearing machine for shearing an associated planar workpiece with relatively low power and without attendant curling of the workpiece comprising, a stationary frame, a stationary knife mounted on said frame, a movable knife, movable knife support means mounting said movable knife for movement toward and away from said stationary knife in coacting shearing relation therewith, a workpiece outboard support anvil disposed adjacent said stationary knife and directly below said movable knife in opposition thereto, and anvil mounting means on said frame for yieldably supporting said anvil, said mounting means effecting a constant even equal yield resistance for the anvil as an associated workpiece is sheared thereon by said movable knife in coaction with the stationary knife, said anvil mounting means effecting a two-dimensional yield of the anvil thereby effecting a diminishing rake angle as the workpiece is sheared.
Claim 3
Dependent Claim
166 words
A shearing machine for shearing an associated planar workpiece with relatively low power and without attendant curling of the workpiece comprising, a stationary frame, a stationary knife mounted on said frame, a movable knife, movable knife support means mounting said movable knife for movement toward and away from said stationary knife in coacting shearing relation therewith, a workpiece outboard support anvil disposed adjacent said stationary knife and directly below said movable knife in opposition thereto, and anvil mounting means on said frame for yieldably supporting said anvil, said mounting means effecting a constant even equal yield resistance for the anvil as an associated workpiece is sheared thereon by said movable knife in coaction with the stationary knife, said anvil mounting means being a pair of coacting piston cylinder mechanisms mounted in a plane parallel to the knives and providing two-dimensional yield of the anvil thereby effecting a progressively diminishing rake angle as the workpiece is sheared, and control means for controlling the pair of piston-cylinder mechanisms.
Claim 4
Dependent Claim
166 words
A shearing machine for shearing an associated planar workpiece with relatively low power and without attendant curling of the workpiece comprising, a stationary frame, a stationary knife mounted on said frame, a movable knife, movable knife support means mounting said movable knife for movement toward and away from said stationary knife in coacting shearing relation therewith, a workpiece outboard support anvil disposed adjacent said stationary knife and directly below said movable knife in opposition thereto, and anvil mounting means on said frame for yieldably supporting said anvil, said mounting means effecting a constant even equal yield resistance for the anvil as an associated workpiece is sheared thereon by said movable knife in coaction with the stationary knife, said anvil mounting means being a pair of coacting piston cylinder mechanisms mounted in a plane parallel to the knives and providing two-dimensional yield of the anvil thereby effecting a progressively diminishing rake angle as the workpiece is sheared, and control means for controlling the pair of piston-cylinder mechanisms.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |