US3744572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chisel plow spring cushion clamp
Assignee: BORG-WARNER ACCEPTANCE Corp A CORP OF
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Filing: 1971-10-22
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Granted: 1973-07-10
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Expires: 1991-10-22
Abstract
Abstract A spring cushion clamp for mounting a tool shank onto the tool support bar of a ground working implement, e.g., a chisel plow. In addition to a main bracket having a depending flange at the rear and spring cushion means at the front, including an upwardly biased U-member or U-bolt for engaging under the front end of a tool shank, the clamp comprises a keeper plate that fits underneath the horizontal portion of the bracket with a rearwardly projecting tongue extending through an opening in the corner of the bracket and a special corner clamping member secured in the inside of the corner of the main bracket. The clamping member is bifurcated to provide an opening therein through which the tool shank and keeper plate tongue extend. Shoulders on the keeper plate at the root of the tongue engage and pivot against the legs of the bifurcated portion of the clamping member. The bottom edge of the opening between the legs of the corner clamping member serves as a stop which the tool shank engages during tilting.
Inventors
- 👤 E Zeltwanger
- 👤 Quickstad Laron
- 👤 R Laidig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:00
CPC Classifications
A; A01; A01B; A01B35/00; A01B35/20; A01B35/22
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
326 words
In combination in a spring cushion clamp for mounting a tool shank having a front end on a tool support of a ground working implement with said clamp including a bracket having a horizontal portion with front and rear ends and a depending flange on the rear end with an opening in the corner of said bracket formed by the juncture of said horizontal portion and said depending flange, attaching means for securing said horizontal portion in fixed position under said support, and spring cushion means mounted on the front end of said horizontal portion having an upwardly biased U-member with a bight portion thereof extending transversely underneath said front end for biasing engagement under the front end of said tool shank mounted in said spring cushion clamp, the improvement comprising: a keeper plate with a rear end and adapted to extend underneath and bear against the underside of said bracket horizontal portion, said keeper plate having a tongue at its rear end which projects through said corner opening for tilting therein and having transversely aligned shoulders at the proximal end of said tongue; a corner clamping member secured within the corner of said bracket and having a lower end portion engaging said depending flange on said bracket, a generally horizontal portion with a front end extending forwardly from said lower end portion, and a generally upwardly extending bifurcated portion having legs extending upwardly from the front end of said generally horizontal portion with the legs thereof having supporting engagement adjacent their upper extremities; and means for tightening said corner clamping member whereby it is secured in position and said generally horizontal portion thereof presses on the underside of said tool shank; said transversely aligned shoulders of said keeper plate bearing against the front surfaces of said legs of said bifurcated portion for absorbing rearward drag on said tool shank and said shoulders pivoting against said legs when said tool shank tilts on encountering an obstacle.
Claim 2
Dependent Claim
326 words
In combination in a spring cushion clamp for mounting a tool shank having a front end on a tool support of a ground working implement with said clamp including a bracket having a horizontal portion with front and rear ends and a depending flange on the rear end with an opening in the corner of said bracket formed by the juncture of said horizontal portion and said depending flange, attaching means for securing said horizontal portion in fixed position under said support, and spring cushion means mounted on the front end of said horizontal portion having an upwardly biased U-member with a bight portion thereof extending transversely underneath said front end for biasing engagement under the front end of said tool shank mounted in said spring cushion clamp, the improvement comprising: a keeper plate with a rear end and adapted to extend underneath and bear against the underside of said bracket horizontal portion, said keeper plate having a tongue at its rear end which projects through said corner opening for tilting therein and having transversely aligned shoulders at the proximal end of said tongue; a corner clamping member secured within the corner of said bracket and having a lower end portion engaging said depending flange on said bracket, a generally horizontal portion with a front end extending forwardly from said lower end portion, and a generally upwardly extending bifurcated portion having legs extending upwardly from the front end of said generally horizontal portion with the legs thereof having supporting engagement adjacent their upper extremities; and means for tightening said corner clamping member whereby it is secured in position and said generally horizontal portion thereof presses on the underside of said tool shank; said transversely aligned shoulders of said keeper plate bearing against the front surfaces of said legs of said bifurcated portion for absorbing rearward drag on said tool shank and said shoulders pivoting against said legs when said tool shank tilts on encountering an obstacle.
Claim 3
Dependent Claim
24 words
The improvement of claim 1 wherein a fastener is provided for securing said keeper plate adjacent the front end thereof to said tool shank.
Claim 4
Dependent Claim
45 words
The improvement of claim 1 wherein said keeper plate has in its opposite sides formations adjacent the front end thereof for engagement with the inner portions of the legs of said U-member for retention of said keeper plate against forward movement relative to said bracket.
Claim 5
Dependent Claim
22 words
The improvement of claim 1 wherein said legs of said bifurcated portion of said corner clamping member have forwardly extending bulges therein.
Claim 6
Dependent Claim
40 words
The improvement of claim 1 wherein said means for tightening said corner clamping member comprise a pair of bolts extending vertically through pairs registering apertures in said generally horizontal portion of said corner clamping member and said bracket horizontal portion.
Claim 7
Dependent Claim
30 words
The improvement of claim 5 wherein said upper extremities of said legs of said bifurcated portion have supporting engagement against the front sides of said pair of vertically extending bolts.
Claim 8
Dependent Claim
42 words
The improvement of claim 5 wherein said apertures in said bracket horizontal portion through which the upper ends of said pair of vertically extending bolts pass are enlarged forwardly and receive therein said upper extremities of said legs of said bifurcated portion.
Claim 9
Dependent Claim
33 words
The improvement of claim 1 wherein said transversely aligned keeper plate shoulders have aligned straight line bottom edges which fulcrum against said legs of said bifurcated portion during tilting of said tool shank.
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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |