US3669445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
De-stacking device for sheet metal blanks
Assignee: Individual
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Filing: 1970-09-15
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Granted: 1972-06-13
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Expires: 1990-09-15
Abstract
Abstract A de-stacking device for a stack of sheet metal blanks having a vertically movable head adapted to engage the top of the stack of blanks and a saw-tooth blade on the head adapted to engage the edge of the topmost blank and upwardly movable for peeling the topmost blank from the stack.
Inventors
- 👤 Bernard J Wallis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:49
CPC Classifications
B; B21; B21D; B21D43/00; B21D43/20; B21D43/24; B65; B65H; B65H3/00; B65H3/08; B65H3/0808; B65H3/0816; B65H3/46; B65H3/56
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
326 words
In a de-stacking device for removing the topmost blank from a stack of sheet metal blanks the combination comprising, a vertically movable head, means for raising and lowering the head over the stack of blanks, abutment means on said head interengageable with the topmost blank when the head is lowered, means for stopping descent of the head in response to interengagement of said abutment means with the topmost blank, a blade on said head extending in a generally vertical plane and having a saw-tooth lower edge, said edge extending at an acute angle relative to the plane of the blank in a direction upward and inward of an edge portion of the blank, said blade being spaced laterally from said abutment means so that said edge engages said edge portion of the topmost blank when said abutment means interengages the top face of the topmost blank at a point remote from said edge portion, means for movably mounting said blade on said head comprising pivot means on said head for pivoting said blade about a generally horizontal axis and guide means on said head for guiding said blade for bodily movement relative to said head in said upward and inward direction, means biasing said blade about its pivotal axis such that said edge is urged downwardly and inwardly of said edge portion of the blank whereby, when said head is lowered to interengage said abutment means with the topmost blank, said teeth ratchet downwardly over said edge portion as the abutment means descends into interengagement with the topmost blank, and actuating means for bodily moving said blade along said guide means relative to said head in said upward and inward direction while said abutment means is interengaged with the topmost blank whereby said blade moves in an arcuate path so that the tooth engaged with said edge portion of the blank flexes the blank upwardly about said abutment means thereby peeling the blank from the stack.
Claim 2
Dependent Claim
326 words
In a de-stacking device for removing the topmost blank from a stack of sheet metal blanks the combination comprising, a vertically movable head, means for raising and lowering the head over the stack of blanks, abutment means on said head interengageable with the topmost blank when the head is lowered, means for stopping descent of the head in response to interengagement of said abutment means with the topmost blank, a blade on said head extending in a generally vertical plane and having a saw-tooth lower edge, said edge extending at an acute angle relative to the plane of the blank in a direction upward and inward of an edge portion of the blank, said blade being spaced laterally from said abutment means so that said edge engages said edge portion of the topmost blank when said abutment means interengages the top face of the topmost blank at a point remote from said edge portion, means for movably mounting said blade on said head comprising pivot means on said head for pivoting said blade about a generally horizontal axis and guide means on said head for guiding said blade for bodily movement relative to said head in said upward and inward direction, means biasing said blade about its pivotal axis such that said edge is urged downwardly and inwardly of said edge portion of the blank whereby, when said head is lowered to interengage said abutment means with the topmost blank, said teeth ratchet downwardly over said edge portion as the abutment means descends into interengagement with the topmost blank, and actuating means for bodily moving said blade along said guide means relative to said head in said upward and inward direction while said abutment means is interengaged with the topmost blank whereby said blade moves in an arcuate path so that the tooth engaged with said edge portion of the blank flexes the blank upwardly about said abutment means thereby peeling the blank from the stack.
Claim 3
Dependent Claim
44 words
The combination called for in claim 1 including blank gripping means on said head, said actuating means being arranged to flex said topmost blank into engagement with said gripping means, said gripping means being arranged to retain said blank for movement with said head.
Claim 4
Dependent Claim
26 words
The combination called for in claim 1 wherein said guide means is pivoted on said pivot means to thereby pivotally mount said blade on said head.
Claim 5
Dependent Claim
19 words
The combination called for in claim 3 wherein said guide means guides said blade for rectilinear movement lengthwise thereof.
Claim 6
Dependent Claim
287 words
In a de-stacking device for removing the topmost blank from a stack of sheet metal blanks the combination comprising, a vertically movable head, means for raising and lowering the head over the stack of blanks, abutment means on said head interengageable with the topmost blank when the head is lowered, means for stopping descent of the head in response to interengagement of said abutment means with the topmost blank, a blade on said hEad extending in a generally vertical plane and having a saw-tooth lower edge, said edge extending upwardly at an acute angle relative to the plane of the blank in a direction inwardly of an edge portion of the blank, said blade being disposed on said head so that said edge engages said edge portion of the topmost blank when said abutment means interengages the topmost blank, said blade being supported on said head for pivotal movement about a generally horizontal axis, means biasing said blade about its pivotal axis such that said edge is urged downwardly and inwardly of said edge portion of the blank whereby, when said head is lowered to interengage said abutment means with the topmost blank, said teeth ratchet downwardly over said edge portion as the abutment means descends into interengagement with the topmost blank, and means for shifting said blade bodily upwardly relative to said head while said abutment means is interengaged with the topmost blank whereby the tooth engaged with said edge portion of the blank flexes the blank upwardly about said abutment means, said means for shifting said blade comprising a power cylinder having a reciprocating piston, said piston being operatively connected with said blade, said cylinder being pivotally mounted on said head about said horizontal axis.
Claim 7
Dependent Claim
287 words
In a de-stacking device for removing the topmost blank from a stack of sheet metal blanks the combination comprising, a vertically movable head, means for raising and lowering the head over the stack of blanks, abutment means on said head interengageable with the topmost blank when the head is lowered, means for stopping descent of the head in response to interengagement of said abutment means with the topmost blank, a blade on said hEad extending in a generally vertical plane and having a saw-tooth lower edge, said edge extending upwardly at an acute angle relative to the plane of the blank in a direction inwardly of an edge portion of the blank, said blade being disposed on said head so that said edge engages said edge portion of the topmost blank when said abutment means interengages the topmost blank, said blade being supported on said head for pivotal movement about a generally horizontal axis, means biasing said blade about its pivotal axis such that said edge is urged downwardly and inwardly of said edge portion of the blank whereby, when said head is lowered to interengage said abutment means with the topmost blank, said teeth ratchet downwardly over said edge portion as the abutment means descends into interengagement with the topmost blank, and means for shifting said blade bodily upwardly relative to said head while said abutment means is interengaged with the topmost blank whereby the tooth engaged with said edge portion of the blank flexes the blank upwardly about said abutment means, said means for shifting said blade comprising a power cylinder having a reciprocating piston, said piston being operatively connected with said blade, said cylinder being pivotally mounted on said head about said horizontal axis.
Claim 8
Dependent Claim
62 words
The combination called for in claim 5 including means forming a stop on said head, and abutment means pivotable with said blade and adapted to engage said stop, said biasing means being adapted to retain said abutment means in engagement with said stop during that portion of the descent of said head prior to the engagement of said blade with said stack.
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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |