Patent US4005757A successfully refreshed from Google Patents.
US4005757A
Expired / Lapsed
US
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Clamp shank device
Assignee: Individual
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Filing: 1975-03-10
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Granted: 1977-02-01
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Expires: 1995-03-10
Abstract
Abstract A clamp shank device designed particularly for attaching a chisel type of plowshare, cultivator blade, or the like to the draft frame of an agricultural implement includes a resiliently-biased clamping arrangement confining a shank member against lateral tipping movement but permitting it to ride up and over obstructions. The shank member is rectangular in cross-section and has a forward, horizontal, attachment portion rigidly held flatwise against the upper face of a rocker plate whose rearward end is beveled downwardly and forwardly to provide an upper pivot edge across the width of the plate. Such pivot edge is received by and extends along the vertex of a forwardly and downwardly facing angle included between the steps of a bottom-stepped rear wall of a supporting frame that is adapted to be attached to and beneath a tool-carrying member of the implement draft frame. The rocker plate is spring-biased upwardly at its forward end toward a top wall of the supporting frame and is free to move downwardly at that end against spring tension while pivoting against the frame on and along the pivot edge of its rearward end, within the vertex of the receiving, included angle of the frame. Any tendency toward lateral tipping of the shank during normal working conditions is minimized by a cinching clamp at the rearward end of the frame.
Inventors
- 👤 Mitchell J. Hess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:41
CPC Classifications
A; A01; A01B; A01B61/00; A01B61/04; A01B61/044; A01B61/046
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
269 words
A clamp shank device comprising a shank member rectangular in cross-section and having a substantially horizontal forward portion and a downwardly-extending rear portion; a supporting frame having a top wall and a transverse rear wall depending from said top wall across the width thereof, said rear wall being stepped upwardly from its bottom along its length on the portion thereof facing the interior of the frame to define a forwardly and downwardly facing, included angle, and being deeply notched upwardly from its bottom intermediate its length to receive said forward portion of the shank member and to accommodate upward movement thereof; a rocker plate positioned within the supporting frame below said top wall thereof, the rearward end of said plate being a surface inclined downwardly and forwardly from the upper edge to the lower edge thereof, said upper edge forming a pivot edge across the width of the plate which abuts and pivots against the portion of said rear wall defining vertex of said included angle; means rigidly holding said forward portion of the shank member flatwise against the upper surface of the rocker plate intermediate the width thereof; and spring means normally resiliently urging the forward end of the rocker plate and the thereto attached portion of the shank member upwardly toward the top wall of said frame, whereby excessive rearward pressure against said downwardly extending rear portion of the shank member will tend to pivot said forward end of the rocker plate and the thereto attached portion of the shank member downwardly against the urge of said spring means and about said pivot edge as an axis.
Claim 2
Dependent Claim
269 words
A clamp shank device comprising a shank member rectangular in cross-section and having a substantially horizontal forward portion and a downwardly-extending rear portion; a supporting frame having a top wall and a transverse rear wall depending from said top wall across the width thereof, said rear wall being stepped upwardly from its bottom along its length on the portion thereof facing the interior of the frame to define a forwardly and downwardly facing, included angle, and being deeply notched upwardly from its bottom intermediate its length to receive said forward portion of the shank member and to accommodate upward movement thereof; a rocker plate positioned within the supporting frame below said top wall thereof, the rearward end of said plate being a surface inclined downwardly and forwardly from the upper edge to the lower edge thereof, said upper edge forming a pivot edge across the width of the plate which abuts and pivots against the portion of said rear wall defining vertex of said included angle; means rigidly holding said forward portion of the shank member flatwise against the upper surface of the rocker plate intermediate the width thereof; and spring means normally resiliently urging the forward end of the rocker plate and the thereto attached portion of the shank member upwardly toward the top wall of said frame, whereby excessive rearward pressure against said downwardly extending rear portion of the shank member will tend to pivot said forward end of the rocker plate and the thereto attached portion of the shank member downwardly against the urge of said spring means and about said pivot edge as an axis.
Claim 3
Dependent Claim
42 words
A clamp shank device according to claim 1, wherein the means holding the shank member to the rocker plate includes a transverse member bridging and closely hugging the shank member and secured to the rocker plate adjacent to the rearward end thereof.
Claim 4
Dependent Claim
52 words
A clamp shank device according to claim 2, wherein cinching clamp means is provided for the shank member at the emergence thereof from the frame, said cinching clamp means comprising a cinching member, a reactiion member rigid with said frame, and means for adjustably connecting the cinching member to the reaction member.
Claim 5
Dependent Claim
81 words
A clamp shank device according to claim 3, within upstanding, mutually spaced, attachment plates are secured to the top wall of the frame for securing said device to the draft frame of an agricultural implement, one of said plates being of structural angle formation and rearwardly placed with a leg of the angle secured flatwise against said top wall and overhanging the rear end of the frame and the shank member, said leg constituting the reaction member of the clamping means.
Claim 6
Dependent Claim
35 words
A clamp shank device according to claim 3, wherein the cinching member has an upper face bearing flatwise against the lower face of the shank member, and the reaction member is above the shank member.
Claim 7
Dependent Claim
52 words
A clamp shank device according to claim 1, wherein cinching clamp means is provided for the shank member at the emergence thereof from the frame, said cinching clamp means comprising a cinching member, a reaction member rigid with said frame, and means for adjustably connecting the cinching member to the reaction member.
Claim 8
Dependent Claim
23 words
A clamp shank device according to claim 1, wherein the frame also has side walls adjoining the rear wall and extending forwardly therefrom.
Claim 9
Dependent Claim
30 words
A clamp shank device according to claim 1, adapted for rigid attachment to the draft frame of a chisel plow implement, the shank member being a chisel plow plowshare shank.
Claim 10
Dependent Claim
51 words
A clamp device according to claim 1, wherein spacer means is provided above the forward portion of the shank member within the frame for insuring positioning of the upper surface of the inclined rearward end of the rocker plate flatwise against the step undersurface of the rear wall of the frame.
Claim 11
Dependent Claim
34 words
A clamp device according to claim 9, wherein the spacer means is the upper portion of the bolt that constitutes part of the means for rigidly holding the shank member against the rocker plate.
References Cited (Backward Citations)
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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) | 1980-02-01 | 1980-08-02 | 1981-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-01 | 1984-08-02 | 1985-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-01 | 1988-08-02 | 1989-02-01 | $7700.00 | Window Closed / Lapsed |