US3859835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cut off for continuous sheet metal former
Assignee: Waterite Industries Inc
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Filing: 1973-07-27
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Granted: 1975-01-14
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Expires: 1993-07-27
Abstract
Abstract For mounting on a continuous sheet metal former, a cut-off die reciprocally mounted at the discharge end of such a former having a die plate for the particular sheet metal form being made, a shear die plate movable at an angle to the perpendicular to shear off a predetermined length of formed metal, and a power cylinder, either air or hydraulic pressure, for actuating the shear plate. The die shear plate has an opening which only approximates the formed sheet metal and does not mate precisely with the die plate openings, but on movement along the die plate, the shear plate initially grabs and holds the formed metal at two points and then progressively shears the formed metal along two shear points to a complete cut-off.
Inventors
- 👤 Jeral D Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:59
CPC Classifications
B; B21; B21D; B21D43/00; B21D43/28; B21D43/287; B23; B23D; B23D23/00; B23D25/00; B23D25/02; B23D25/04; Y; Y10; Y10T; Y10T83/00; Y10T83/465; Y10T83/4728; Y10T83/4757; Y10T83/4763; Y10T83/869; Y10T83/8821; Y10T83/8857
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
238 words
A traveling cut-off for a continuous thin sheet metal gutter former having a generally squared U-shape, comprising frame means mountable at the existing end of a continuous sheet metal gutter former; a die plate reciprocably mounted on said frame means; means for returning said Die plate from a position away from said former to a position adjacent thereto; an opening in said die plate approximating the cross-section of the formed metal sheet and permitting free passage of the formed metal sheet therethrough; a shear plate juxtaposed against said die plate and arranged to move at an angle to the vertical thereacross, there being an opening in said shear plate similar to the shape of the opening in said die plate and of a larger size and off-set from the die plate opening, whereby initial movement of said shear plate clamps and holds the sheet metal and inner edge of the opening in said shear plate is offset for the die plate to provide a progressive shear action on the formed metal sheet; means supporting said shear plate adjacent said die plate and permitting diagonal reciprocable movement therealong; means for returning said shear plate from a lower position to an upper position with the openings in register; a power cylinder, having a piston rod, mounted on said die plate and movable therewith, and said piston arranged to press downwardly on said shear blade; and means for actuating said cylinder.
Claim 2
Dependent Claim
238 words
A traveling cut-off for a continuous thin sheet metal gutter former having a generally squared U-shape, comprising frame means mountable at the existing end of a continuous sheet metal gutter former; a die plate reciprocably mounted on said frame means; means for returning said Die plate from a position away from said former to a position adjacent thereto; an opening in said die plate approximating the cross-section of the formed metal sheet and permitting free passage of the formed metal sheet therethrough; a shear plate juxtaposed against said die plate and arranged to move at an angle to the vertical thereacross, there being an opening in said shear plate similar to the shape of the opening in said die plate and of a larger size and off-set from the die plate opening, whereby initial movement of said shear plate clamps and holds the sheet metal and inner edge of the opening in said shear plate is offset for the die plate to provide a progressive shear action on the formed metal sheet; means supporting said shear plate adjacent said die plate and permitting diagonal reciprocable movement therealong; means for returning said shear plate from a lower position to an upper position with the openings in register; a power cylinder, having a piston rod, mounted on said die plate and movable therewith, and said piston arranged to press downwardly on said shear blade; and means for actuating said cylinder.
Claim 3
Dependent Claim
33 words
A traveling cut-off according to claim 1 wherein said shear plate includes an upper pressure plate and said piston rod includes a foot arranged to press on and slide across said pressure plate.
Claim 4
Dependent Claim
48 words
A traveling cut-off according to claim 1 wherein said means for returning said shear plate includes a series of compression springs under said shear plate mounted at angle to said disc plate and incline with said shear plate for direct bias of said springs on said shear plate.
Claim 5
Dependent Claim
27 words
A traveling cut-off according to claim 1 wherein said means for returning said die plate includes tension springs biasing said die plate toward the sheet metal former.
Claim 6
Dependent Claim
49 words
A traveling cut-off according to claim 1 wherein said means for supporting said shear plate includes opposed guides mounted on said die plate and arranged at an angle to the vertical whereby said shear plate moves at an angle to the vertical across the opening in said die plate.
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) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |