Patent US3681844A successfully refreshed from Google Patents.
US3681844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shear stop
Assignee: Parker Manufacturing Co
•
Filing: 1970-10-23
•
Granted: 1972-08-08
•
Expires: 1990-10-23
Abstract
Abstract Means are provided in a shear mechanism to limit the travel of one blade relative to the other. The limiting means are located at the pivot point of the blades and are coaxial with the pivot pin.
Inventors
- 👤 Edward D Priest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:56
CPC Classifications
B; B26; B26B; B26B13/00; B26B13/12; B26B13/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
127 words
In a cutting instrument, a. a pair of opposed blades adapted to overlie one another, each of said blades having a cutting surface and an actuating handle appended thereto, b. an opening in each blade, said opening having a border and said border consisting of an arcuate portion of larger radius, an arcuate portion of smaller radius, and side portions positioned so that the centers of curvature of the two arcuate portions coincide, c. stop means positioned within said openings and effective to limit the relative travel of the opposed blades, d. means assembling said blades and said stopping means and allowing them to rotate relative to one another about a common axis which corresponds to the center of curvature of the arcuate portions of the openings.
Claim 2
Dependent Claim
127 words
In a cutting instrument, a. a pair of opposed blades adapted to overlie one another, each of said blades having a cutting surface and an actuating handle appended thereto, b. an opening in each blade, said opening having a border and said border consisting of an arcuate portion of larger radius, an arcuate portion of smaller radius, and side portions positioned so that the centers of curvature of the two arcuate portions coincide, c. stop means positioned within said openings and effective to limit the relative travel of the opposed blades, d. means assembling said blades and said stopping means and allowing them to rotate relative to one another about a common axis which corresponds to the center of curvature of the arcuate portions of the openings.
Claim 3
Dependent Claim
88 words
The cutting instrument of claim 1, in which the stop means has an arcuate border portion of radius slightly less than that of the arcuate border portion of smaller radius of the openings, has an elongated border portion which extends from the center of curvature of the arcuate border portion of the stopping means slightly less than the radius of the arcuate border portion Of larger radius of the openings, and is rotatable about the center of curvature of its arcuate boarder portion and about said common axis.
Claim 4
Dependent Claim
17 words
The cutting instrument of claim 2, in which the assembling means overlies and encloses the stop means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |