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US3703056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Knife grinding device for a motor-driven cutting tool
Assignee: Krauss und Reichert GmbH and Co KG
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Filing: 1971-05-13
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Granted: 1972-11-21
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Expires: 1991-05-13
Abstract
Abstract In a motor-driven cutting tool, at either side of the knife there are arranged rotary grinding elements supported by a grinder head reciprocating parallel to the knife. Mechanical means are provided which, as the grinder head moves in the one or the other direction, displace the one or the other grinding element and cause them to engage and thus grind alternately the two knife blade faces. The period of applying the force to said grinding elements during the reciprocation of the grinder head is changeable for grinding only selected ranges of the knife blade faces.
Inventors
- 👤 Boris Langhoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:51
CPC Classifications
B; B26; B26F; B26F1/00; B26F1/38; B26F1/3806; B26F1/3813; B26F1/382
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
229 words
In a knife grinding device associated with a cutting tool having a knife including two blade faces, said device being of the type having (a) a grinder head reciprocably mounted on said tool, (b) means for causing a reciprocating motion of said grinder head, (c) grinding elements supported by said grinder head and disposed at either side of said knife, (d) swinger arms supported by said grinder head and associated with each grinding element to alternately urge the latter into grinding engagement with one and the other knife blade face during reciprocation of said grinder head, and (e) spring means urging said swinger arms in a mid position in which each grinding element is in a spaced, inoperative position with respect to said knife blade faces, the improvement comprising A. control rod means affixed to said grinder head to reciprocate therewith; said control rod means having determined brakable and non-brakable portions, B. linkage means establishing a connection between said control rod means and said swinger arms, C. brake means operatively associated with said control rod means for frictionally engaging said determined brakable portions of said control rod means to hinder its passage through said brake means during said reciprocating motion and D. means for causing a swinger arm-actuating displacement of said linkage means when said control rod means is hindered by said brake means to effect said grinding engagement.
Claim 2
Dependent Claim
229 words
In a knife grinding device associated with a cutting tool having a knife including two blade faces, said device being of the type having (a) a grinder head reciprocably mounted on said tool, (b) means for causing a reciprocating motion of said grinder head, (c) grinding elements supported by said grinder head and disposed at either side of said knife, (d) swinger arms supported by said grinder head and associated with each grinding element to alternately urge the latter into grinding engagement with one and the other knife blade face during reciprocation of said grinder head, and (e) spring means urging said swinger arms in a mid position in which each grinding element is in a spaced, inoperative position with respect to said knife blade faces, the improvement comprising A. control rod means affixed to said grinder head to reciprocate therewith; said control rod means having determined brakable and non-brakable portions, B. linkage means establishing a connection between said control rod means and said swinger arms, C. brake means operatively associated with said control rod means for frictionally engaging said determined brakable portions of said control rod means to hinder its passage through said brake means during said reciprocating motion and D. means for causing a swinger arm-actuating displacement of said linkage means when said control rod means is hindered by said brake means to effect said grinding engagement.
Claim 3
Dependent Claim
229 words
In a knife grinding device associated with a cutting tool having a knife including two blade faces, said device being of the type having (a) a grinder head reciprocably mounted on said tool, (b) means for causing a reciprocating motion of said grinder head, (c) grinding elements supported by said grinder head and disposed at either side of said knife, (d) swinger arms supported by said grinder head and associated with each grinding element to alternately urge the latter into grinding engagement with one and the other knife blade face during reciprocation of said grinder head, and (e) spring means urging said swinger arms in a mid position in which each grinding element is in a spaced, inoperative position with respect to said knife blade faces, the improvement comprising A. control rod means affixed to said grinder head to reciprocate therewith; said control rod means having determined brakable and non-brakable portions, B. linkage means establishing a connection between said control rod means and said swinger arms, C. brake means operatively associated with said control rod means for frictionally engaging said determined brakable portions of said control rod means to hinder its passage through said brake means during said reciprocating motion and D. means for causing a swinger arm-actuating displacement of said linkage means when said control rod means is hindered by said brake means to effect said grinding engagement.
Claim 4
Dependent Claim
229 words
In a knife grinding device associated with a cutting tool having a knife including two blade faces, said device being of the type having (a) a grinder head reciprocably mounted on said tool, (b) means for causing a reciprocating motion of said grinder head, (c) grinding elements supported by said grinder head and disposed at either side of said knife, (d) swinger arms supported by said grinder head and associated with each grinding element to alternately urge the latter into grinding engagement with one and the other knife blade face during reciprocation of said grinder head, and (e) spring means urging said swinger arms in a mid position in which each grinding element is in a spaced, inoperative position with respect to said knife blade faces, the improvement comprising A. control rod means affixed to said grinder head to reciprocate therewith; said control rod means having determined brakable and non-brakable portions, B. linkage means establishing a connection between said control rod means and said swinger arms, C. brake means operatively associated with said control rod means for frictionally engaging said determined brakable portions of said control rod means to hinder its passage through said brake means during said reciprocating motion and D. means for causing a swinger arm-actuating displacement of said linkage means when said control rod means is hindered by said brake means to effect said grinding engagement.
Claim 5
Dependent Claim
33 words
An improvement as defined in claim 1, including means for connecting said linkage means to said control rod means at any selected one of a plurality of Locations along said control rod means.
Claim 6
Dependent Claim
70 words
An improvement as defined in claim 1, including A. a rotatable sleeve axially fixedly held on said control rod means; said sleeve having a helical groove provided in its outer lateral face, B. pin means mounted on said linkage means and extending into said helical groove at any selected location along said sleeve and C. means for immobilizing said pin means with respect to said sleeve in said selected location.
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) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |