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US3742797A Expired / Lapsed US ⏱️ 0.0 years remaining

Die set with stripper plate

Assignee: OBERG Manufacturing CO
•
Filing: 1971-06-14
•
Granted: 1973-07-03
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Expires: 1991-06-14
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Abstract

Abstract Disposed between the upper punch holder and lower die holder of a die set is a stripper plate that is movable vertically relative to both holders. The plate is suspended from the punch holder and between them there are springs that resist movement of the plate and punch holder toward each other when the plate is pressed against the work being punched. Guide posts rigidly mounted in the punch holder extend down through guide passages in the stripper plate and into vertical passages in the die holder. A bearing sleeve is mounted on each guide post for vertical movement thereon and extends through the adjoining stripper plate passage and down along the post. A bushing encircling this sleeve, which it engages, fits in a bearing sleeve mounted in an underlying passage in the die holder. The upper ends of the bushings are rigidly connected to the stripper plate. The bushings hold the stripper plate against tilting relative to the punch and die holders.

Inventors

  • 👤 J Vecchi

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 21:32
CPC Classifications
B; B21; B21D; B21D37/00; B21D37/10; B21D45/00; B21D45/003; B21D45/006; Y; Y10; Y10T; Y10T83/00; Y10T83/202; Y10T83/2092; Y10T83/2096; Y10T83/2135; Y10T83/215; Y10T83/2155; Y10T83/2159; Y10T83/869; Y10T83/8821; Y10T83/8855; Y10T83/929; Y10T83/9457

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 192 words
A die set comprising an upper punch holDer and lower die holder, at least one punch extending downwardly from the punch holder, a normally elevated stripper plate disposed between and spaced from said holders and movable vertically relative thereto, the plate having a punch-receiving opening therethrough, means suspending the plate from the punch holder, springs between the punch holder and plate urging the plate away from the punch holder, the plate being provided with vertical guide passages therethrough, guide posts rigidly mounted in the punch holder and extending down through said plate passages, the die holder having vertical passages therein containing said posts, a lower bearing sleeve mounted in each die holder passage for vertical movement therein, a bearing sleeve mounted on each guide post for vertical movement thereon and extending through the adjoining stripper plate passage and down along the post, a bushing fitting tightly in each plate passage and lower bearing sleeve and encircling the post-mounted bearing sleeve therein in engagement with it, and means rigidly connecting the upper ends of the bushings to the stripper plate, whereby said bushings hold the stripper plate against tilting relative to said holders.
Claim 2
Dependent Claim 192 words
A die set comprising an upper punch holDer and lower die holder, at least one punch extending downwardly from the punch holder, a normally elevated stripper plate disposed between and spaced from said holders and movable vertically relative thereto, the plate having a punch-receiving opening therethrough, means suspending the plate from the punch holder, springs between the punch holder and plate urging the plate away from the punch holder, the plate being provided with vertical guide passages therethrough, guide posts rigidly mounted in the punch holder and extending down through said plate passages, the die holder having vertical passages therein containing said posts, a lower bearing sleeve mounted in each die holder passage for vertical movement therein, a bearing sleeve mounted on each guide post for vertical movement thereon and extending through the adjoining stripper plate passage and down along the post, a bushing fitting tightly in each plate passage and lower bearing sleeve and encircling the post-mounted bearing sleeve therein in engagement with it, and means rigidly connecting the upper ends of the bushings to the stripper plate, whereby said bushings hold the stripper plate against tilting relative to said holders.
Claim 3
Dependent Claim 39 words
A die set according to claim 1, in which said lower bearing sleeves extend above the die holder while the die set is open and are disposed substantially entirely within the die holder while the die set is closed.
Claim 4
Dependent Claim 35 words
A die set according to claim 1, in which said bushings project above the stripper plate, and said connecting means are mounted on top of said plate and are secured to the upwardly projecting bushings.
Claim 5
Dependent Claim 30 words
A die set according to claim 3, in which the bushings above the stripper plate are provided with circumferential grooves, and said connecting means are lugs projecting into said grooves.

References Cited (Backward Citations)

US2422774A Cited
US2364835A Cited
US2428698A Cited
US2906563A Cited
US2997907A Cited
US3140630A Cited
US3357755A Cited
US3417643A Cited
US3631765A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-07-02 1977-01-01 1977-07-03 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-07-02 1981-01-01 1981-07-03 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-07-02 1985-01-01 1985-07-03 $7700.00 Window Closed / Lapsed

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