Patent US3828432A successfully refreshed from Google Patents.
US3828432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shear construction
Assignee: Trumpf SE and Co KG
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Filing: 1973-03-05
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Granted: 1974-08-13
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Expires: 1993-03-05
Abstract
Abstract A shear, particularly a portable shear, includes a first reciprocating blade and a second fixed blade which is mounted alongside the path of movement of the first blade for cooperative shearing operation therewith. Each blade comprises a block-like member having a plurality of separately oriented cutting edges disposed at angles to each other and the mounting means for each blade is such that the blades may be adjusted so as to present a selected cutting edge in an operative position.
Inventors
- 👤 Berthold Leibinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:56
CPC Classifications
B; B23; B23D; B23D29/00; B23D29/005; B23D27/00; B23D27/02; B23D35/00; B23D35/002
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
117 words
A shear, particularly a portable shear, comprising a first reciprocating blade, a second fixed blade, first mounting means mounting said first blade for reciprocating movement, second mounting means mounting said second blade in a fixed position closely alongside the movement path of said first blade for cooperative shearing operation with said first blade, each blade comprising a block-like member having a plurality of separately oriented cutting edges disposed at angles to each other, said first and second mounting means permitting the adjustable positioning of said first and second blades for the orientation of selected cutting edges in operative positions, said first and second blades having straight cutting edges and being in the form of a truncated pyramid.
Claim 2
Dependent Claim
117 words
A shear, particularly a portable shear, comprising a first reciprocating blade, a second fixed blade, first mounting means mounting said first blade for reciprocating movement, second mounting means mounting said second blade in a fixed position closely alongside the movement path of said first blade for cooperative shearing operation with said first blade, each blade comprising a block-like member having a plurality of separately oriented cutting edges disposed at angles to each other, said first and second mounting means permitting the adjustable positioning of said first and second blades for the orientation of selected cutting edges in operative positions, said first and second blades having straight cutting edges and being in the form of a truncated pyramid.
Claim 3
Dependent Claim
40 words
A shear, according to claim 1, wherein said blades are of substantially the same form and each is provided with a central hole therethrough, said mounting means comprising a bolt extending through the hole to secure said blade in position.
Claim 4
Dependent Claim
28 words
A shear, according to claim 1, wherein said first and second mounting means mount said first and second blades so that their mounting axes are substantially 90* apart.
Claim 5
Dependent Claim
55 words
A shear, according to claim 1, wherein said first and second mounting means and said first and second blades are such that said first and second blades overlap each other in the lower dead center position of movement of said first blade, the overlapping being approximately to the center of said first and second blades.
Claim 6
Dependent Claim
229 words
A shear, particularly a portable shear, comprising a first reciprocating blade, a second fixed blade, first mounting means mounting said first blade for reciprocating movement, second mounting mrand mounting said second blade in a fixed position closely alongside the movement path of said first blade for cooperative shearing operation with said first blade, each blade comprising a block-like member having a plurality of separately oriented cutting edges disposed at angles to each other, said first and second mounting means permitting the adjustable positioning of said first and second blades for the orientation of selected cutting edges in operative positions, said first mounting means comprising a plunger, a frame head guiding said plunger for vertical upward and downward movement, said first blade comprising a truncated pyramid having a bore therethrough, a bolt extending thrOugh the bore of said first blade and holding said first blade to said plunger with said first blade positioned in an upright position, said second mounting means comprising a mounting arm located below said plunger and having an upwardly facing mounting base, said second blade being mounted on said upwardly facing mounting base and being in the form of a truncated pyramid with a bore extending therethrough, a second bolt extending through the bore of said second cutting blade and into said mounting base and holding said second blade in a flat substantially horizontally extending position.
Claim 7
Dependent Claim
229 words
A shear, particularly a portable shear, comprising a first reciprocating blade, a second fixed blade, first mounting means mounting said first blade for reciprocating movement, second mounting mrand mounting said second blade in a fixed position closely alongside the movement path of said first blade for cooperative shearing operation with said first blade, each blade comprising a block-like member having a plurality of separately oriented cutting edges disposed at angles to each other, said first and second mounting means permitting the adjustable positioning of said first and second blades for the orientation of selected cutting edges in operative positions, said first mounting means comprising a plunger, a frame head guiding said plunger for vertical upward and downward movement, said first blade comprising a truncated pyramid having a bore therethrough, a bolt extending thrOugh the bore of said first blade and holding said first blade to said plunger with said first blade positioned in an upright position, said second mounting means comprising a mounting arm located below said plunger and having an upwardly facing mounting base, said second blade being mounted on said upwardly facing mounting base and being in the form of a truncated pyramid with a bore extending therethrough, a second bolt extending through the bore of said second cutting blade and into said mounting base and holding said second blade in a flat substantially horizontally extending position.
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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |