Patent US3874120A successfully refreshed from Google Patents.
US3874120A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Knife sharpener, particularly for a microtome
Assignee: ARTHUR H THOMAS CO
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Filing: 1973-02-06
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Granted: 1975-04-01
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Expires: 1993-02-06
Abstract
Abstract A knife sharpener, particularly for a microtome knife, holds the knife against a reciprocating surface at a first angular position relative to the direction of displacement of the surface, shifts the knife to another angular position relative to the displacement of the surface after a predetermined amount of relative knife and surface displacement, lifts and turns the knife over to sharpen the opposite side of the edge in response to a further measured amount of displacement of the surface, again shifts the angular position of the knife relative to the surface in response to yet a further relative displacement of the surface, then lifts and turns the knife over, and the entire cycle is repeated.
Inventors
- 👤 Robert J Dalton
- 👤 Frederick W Pfleger
- 👤 John Y Steel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:23
CPC Classifications
B; B24; B24B; B24B3/00; B24B3/36; B24B3/48; B24B3/38
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
118 words
In a knife sharpener, means for Holding a knife against an abrasive surface for sharpening the knife edge, drive means for displacing said knife and said surface relative to each other, the direction of relative displacement between said knife and surface being at an oblique angle with respect to the cutting edge of said knife, means for automatically changing said angle from a first predetermined angular position to a second predetermined angular position in response to a measured amount of relative displacement of said knife and surface, and means to turn the knife over to sharpen an opposite side of the edge in response to a further measured amount of relative displacement of said knife and said surface.
Claim 2
Dependent Claim
118 words
In a knife sharpener, means for Holding a knife against an abrasive surface for sharpening the knife edge, drive means for displacing said knife and said surface relative to each other, the direction of relative displacement between said knife and surface being at an oblique angle with respect to the cutting edge of said knife, means for automatically changing said angle from a first predetermined angular position to a second predetermined angular position in response to a measured amount of relative displacement of said knife and surface, and means to turn the knife over to sharpen an opposite side of the edge in response to a further measured amount of relative displacement of said knife and said surface.
Claim 3
Dependent Claim
96 words
In a knife sharpener, means for holding a knife against an abrasive surface for sharpening the knife edge, drive means for displacing said surface and said knife relative to each other, means for automatically shifting the angular position of the knife relative to the direction of displacement from a first predetermined angular position to another predetermined angular position in response to a measured amount of displacement of the surface, and means to turn the knife over to sharpen an opposite side of the edge in response to a further measured amount of displacement of said surface.
Claim 4
Dependent Claim
96 words
In a knife sharpener, means for holding a knife against an abrasive surface for sharpening the knife edge, drive means for displacing said surface and said knife relative to each other, means for automatically shifting the angular position of the knife relative to the direction of displacement from a first predetermined angular position to another predetermined angular position in response to a measured amount of displacement of the surface, and means to turn the knife over to sharpen an opposite side of the edge in response to a further measured amount of displacement of said surface.
Claim 5
Dependent Claim
43 words
In a knife sharpener in accordance with claim 2 wherein said means for shifting the angular position of the knife relative to the direction of displacement of the surface comprises means to push the knife from one angular position to another angular position.
Claim 6
Dependent Claim
47 words
In a knife sharpener in accordance with claim 3 wherein said means for shifting the angular position of the knife includes means to bring said means to push the knife into operative engagement with the knife in response to a measured amount of displacement of the surface.
Claim 7
Dependent Claim
40 words
In a knife sharpener in accordance with claim 1 wherein said means to turn the knife over to sharpen an opposite side of the edge of a knife includes means for lifting and rotating the means for holding the knife.
Claim 8
Dependent Claim
115 words
In a knife sharpener, means for holding a knife against an abrasive surface for sharpening the knife edge, drive means for displacing said surface and said knife in straight line linear motion relative to each other, means for automatically shifting the angular position of the knife relative to the direction of linear displacement from a first predetermined angular position to a second predetermined angular position in response to a predetermined amount of displacement of the surface and knife relative to each other, and means to turn the knife over to sharpen the opposite side of the edge in response to a further predetermined amount of displacement of the knife and surface relative to each other.
Claim 9
Dependent Claim
115 words
In a knife sharpener, means for holding a knife against an abrasive surface for sharpening the knife edge, drive means for displacing said surface and said knife in straight line linear motion relative to each other, means for automatically shifting the angular position of the knife relative to the direction of linear displacement from a first predetermined angular position to a second predetermined angular position in response to a predetermined amount of displacement of the surface and knife relative to each other, and means to turn the knife over to sharpen the opposite side of the edge in response to a further predetermined amount of displacement of the knife and surface relative to each other.
Claim 10
Dependent Claim
104 words
In a knife sharpener, means for holding a knife against an abrasive surface for sharpening the knife edge, drive means for displacing said surface in straight line linear reciprocable motion relative to said knife, means for automatically shifting the angular position of the knife relative to the direction of linear displacement of said surface from a first predetermined angular position to a second predetermined angular position in response to a predetermined number of reciprocations of said surface, and means to turn the knife over to sharpen an opposite side of the edge in response to a further predetermined number of reciprocations of said surface.
Claim 11
Dependent Claim
104 words
In a knife sharpener, means for holding a knife against an abrasive surface for sharpening the knife edge, drive means for displacing said surface in straight line linear reciprocable motion relative to said knife, means for automatically shifting the angular position of the knife relative to the direction of linear displacement of said surface from a first predetermined angular position to a second predetermined angular position in response to a predetermined number of reciprocations of said surface, and means to turn the knife over to sharpen an opposite side of the edge in response to a further predetermined number of reciprocations of said surface.
Claim 12
Dependent Claim
48 words
In a knife sharpener in accordance with claim 7 wherein said means for shifting the angular position of the knife relative to the direction of displacement of the surface comprises means to push the means for holding the knife from one angular position to a second angular position.
Claim 13
Dependent Claim
48 words
In a knife sharpener in accordance with claim 8 wherein said means for pushing the means for holding the knife includes a pusher and means for selectively engaging said pusher to the reciprocating abrasive surface to bring said pusher into engagement with said means for holding said knife.
Claim 14
Dependent Claim
31 words
In a knife sharpener in accordancE with claim 7 wherein said means to turn the knife over includes means for lifting and rotating the means for holding the knife through 180*.
Claim 15
Dependent Claim
38 words
In a knife sharpener in accordance with claim 10 wherein said means for lifting and rotating the knife holder includes means for selectively latching the means for lifting and rotating the knife holder to the reciprocable abrasive surface.
Claim 16
Dependent Claim
184 words
In a knife sharpener, means for holding a knife against an abrasive surface for sharpening the knife edge, support means for the abrasive surface, drive means for displacing said support means in straight line linear reciprocable motion to thereby displace said abrasive surface in straight line linear motion relative to the knife, means for shifting the angular position of the knife relative to the direction of linear reciprocation of said abrasive surface from a first angular position to a second angular position, said means for shifting the angular position of the knife including a pusher for pushing the means for holding the knife from a first angular position to a second angular position and means for selectively engaging said pusher with said reciprocating support means, and means to turn the knife over to sharpen its opposite side, said means to turn the knife over including means to lift and rotate the knife through 180*, said means to lift and rotate the knife through 180* including means to selectively latch the means to lift and rotate the knife through 180* to the reciprocable support means.
Claim 17
Dependent Claim
184 words
In a knife sharpener, means for holding a knife against an abrasive surface for sharpening the knife edge, support means for the abrasive surface, drive means for displacing said support means in straight line linear reciprocable motion to thereby displace said abrasive surface in straight line linear motion relative to the knife, means for shifting the angular position of the knife relative to the direction of linear reciprocation of said abrasive surface from a first angular position to a second angular position, said means for shifting the angular position of the knife including a pusher for pushing the means for holding the knife from a first angular position to a second angular position and means for selectively engaging said pusher with said reciprocating support means, and means to turn the knife over to sharpen its opposite side, said means to turn the knife over including means to lift and rotate the knife through 180*, said means to lift and rotate the knife through 180* including means to selectively latch the means to lift and rotate the knife through 180* to the reciprocable support means.
Claim 18
Dependent Claim
172 words
In a knife sharpener, means for holding a knife against an abrasive surface for sharpening the knife edge, support means for the abrasive surface, drive means for displacing said support means in reciprocable straight line linear motion relative to said knife edge, means to hold one side of said knife edge against said abrasive surface at a first predetermined angular position for at least one reciprocation of said surface, means to shift said knife edge to a second predetermined angular position, means to hold said knife edge at said second predetermined angular position for at least one reciprocation of said surface, means to lift and turn the knife over, means to hold the opposite side of the edge of said knife against said abrasive surface at a first predetermined angular position for at least one reciprocation of said surface, means to shift said knife edge to a second predetermined angular position and means to hold said knife edge at said second predetermined angular position for at least one reciprocation of said surface.
Claim 19
Dependent Claim
172 words
In a knife sharpener, means for holding a knife against an abrasive surface for sharpening the knife edge, support means for the abrasive surface, drive means for displacing said support means in reciprocable straight line linear motion relative to said knife edge, means to hold one side of said knife edge against said abrasive surface at a first predetermined angular position for at least one reciprocation of said surface, means to shift said knife edge to a second predetermined angular position, means to hold said knife edge at said second predetermined angular position for at least one reciprocation of said surface, means to lift and turn the knife over, means to hold the opposite side of the edge of said knife against said abrasive surface at a first predetermined angular position for at least one reciprocation of said surface, means to shift said knife edge to a second predetermined angular position and means to hold said knife edge at said second predetermined angular position for at least one reciprocation of said surface.
Claim 20
Dependent Claim
180 words
In a knife sharpener, means for holding a knife against an abrasive surface for sharpening the knife edge, drive means for displacing said knife and said surface relative to each other, means for maintaining the cutting edge of said knife at an oblique angle with respect to the direction of relative displacement between said knife and said surface, means for changing said angle from a first angular position to a second angular position in response to a measured amount of relative displacement of said knife and surface, means to turn the knife over to sharpen an opposite side of the edge in response to a further measured amount of relative displacement of said knife and said surface, means for again changing said angle from a first angular position to a second angular position in response to a measured amount of relative displacement of said knife and surface, and means to turn the knife over to again sharpen the first side of the knife edge in response to a further measured amount of relative displacement of said knife and said surface.
Claim 21
Dependent Claim
180 words
In a knife sharpener, means for holding a knife against an abrasive surface for sharpening the knife edge, drive means for displacing said knife and said surface relative to each other, means for maintaining the cutting edge of said knife at an oblique angle with respect to the direction of relative displacement between said knife and said surface, means for changing said angle from a first angular position to a second angular position in response to a measured amount of relative displacement of said knife and surface, means to turn the knife over to sharpen an opposite side of the edge in response to a further measured amount of relative displacement of said knife and said surface, means for again changing said angle from a first angular position to a second angular position in response to a measured amount of relative displacement of said knife and surface, and means to turn the knife over to again sharpen the first side of the knife edge in response to a further measured amount of relative displacement of said knife and said surface.
Claim 22
Dependent Claim
38 words
In a knife sharpener in accordance with claim 14 wherein said means for changing the angle of relative displacement between said knife and surface comprises means to push the knife from one angular position to another angular position.
Claim 23
Dependent Claim
141 words
In a knife sharpener, means for holding a knife against an abrasive surface for sharpening the knife edge, drive meanS for displacing said surface in straight line linear reciprocable motion relative to said knife, means for shifting the angular position of the knife relative to the direction of linear displacement of said surface from a first angular position to a second angular position in response to a predetermined number of reciprocations of said surface, said means for shifting including a pusher for pushing the means for holding the knife and means for selectively engaging said pusher to the reciprocating abrasive surface to bring said pusher into engagement with said means for holding said knife, and means to turn the knife over to sharpen an opposite side of the edge in response to a further predetermined number of reciprocations of said surface.
Claim 24
Dependent Claim
141 words
In a knife sharpener, means for holding a knife against an abrasive surface for sharpening the knife edge, drive meanS for displacing said surface in straight line linear reciprocable motion relative to said knife, means for shifting the angular position of the knife relative to the direction of linear displacement of said surface from a first angular position to a second angular position in response to a predetermined number of reciprocations of said surface, said means for shifting including a pusher for pushing the means for holding the knife and means for selectively engaging said pusher to the reciprocating abrasive surface to bring said pusher into engagement with said means for holding said knife, and means to turn the knife over to sharpen an opposite side of the edge in response to a further predetermined number of reciprocations of said surface.
Claim 25
Dependent Claim
144 words
In a knife sharpener, means for holding a knife against an abrasive surface for sharpening the knife edge, drive means for displacing said surface in straight line linear reciprocable motion relative to said knife, means for shifting the angular position of the knife relative to the direction of linear displacement of said surface from a first angular position to a second angular position in response to a predetermined number of reciprocations of said surface, and means to turn the knife over to sharpen an opposite side of the edge in response to a further predetermined number of reciprocations of said surface, said means to turn the knife over including means for lifting the means for holding the knife and for rotating the same through 180* and means for selectively latching the means for lifting and rotating the knife holder to the reciprocable abrasive surface.
Claim 26
Dependent Claim
144 words
In a knife sharpener, means for holding a knife against an abrasive surface for sharpening the knife edge, drive means for displacing said surface in straight line linear reciprocable motion relative to said knife, means for shifting the angular position of the knife relative to the direction of linear displacement of said surface from a first angular position to a second angular position in response to a predetermined number of reciprocations of said surface, and means to turn the knife over to sharpen an opposite side of the edge in response to a further predetermined number of reciprocations of said surface, said means to turn the knife over including means for lifting the means for holding the knife and for rotating the same through 180* and means for selectively latching the means for lifting and rotating the knife holder to the reciprocable abrasive surface.
Claim 27
Dependent Claim
120 words
In a knife sharpener, means for holding a knife against an abrasive surface for sharpening the knife edge, drive means for displacing said surface and said knife edge in straight line linear motion relative to each other, means to hold one side of said knife edge against said abrasive surface at a first and then a second angular position, means to move said knife in a first direction away from said surface, means to rotate said knife relative to said surface in a direction from said first direction to thereby turn the knife over, and means to hold the opposite side of the edge of said knife against said abrasive surface at a first and then a second angular position.
Claim 28
Dependent Claim
120 words
In a knife sharpener, means for holding a knife against an abrasive surface for sharpening the knife edge, drive means for displacing said surface and said knife edge in straight line linear motion relative to each other, means to hold one side of said knife edge against said abrasive surface at a first and then a second angular position, means to move said knife in a first direction away from said surface, means to rotate said knife relative to said surface in a direction from said first direction to thereby turn the knife over, and means to hold the opposite side of the edge of said knife against said abrasive surface at a first and then a second angular position.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |