Patent US3848734A successfully refreshed from Google Patents.
US3848734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Doctoring apparatus
Assignee: United States Department of Agriculture
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Filing: 1973-06-14
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Granted: 1974-11-19
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Expires: 1993-06-14
Abstract
Abstract An apparatus for continuous, uninterrupted doctoring of material from a moving belt combines a stand-by blade and a multiplebladed assembly, each of which is supported on the lower ends of a pair of pivotally mounted lever arms. The multiple-bladed assembly is rotatable and is provided with ratchet and pawls for indexing when a new blade is needed for doctoring. Actuating and sequence timing means engage the upper ends of the two pairs of lever arms and provide the energy needed for doctoring and for indexing the multiple-bladed assembly. When it is time to provide a new blade for doctoring, the stand-by blade is moved into doctoring position, the multiple-bladed assembly is then retracted, automatically indexed to the next blade in sequence, and returned to the doctoring position after which the stand-by blade is retracted.
Inventors
- 👤 W Heiland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:24
CPC Classifications
B; B65; B65G; B65G45/00; B65G45/10; B65G45/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
138 words
A doctoring apparatus for uninterrupted doctoring of material from a moving belt comprising a multiple-bladed doctor assembly rotatably mounted and provided with means for indexing said assembly by rotating said assembly in the same direction of rotation as the moving belt to provide a new blade in doctoring position, a single blade for doctoring during the indexing operation of the multiple-bladed assembly, a first pivotal means engaging said multiple-bladed doctor assembly for moving said assembly in and out of doctoring position, a second pivotal means engaging said single blade for moving said blade in and out of doctoring position during the indexing operation of the multiplebladed assembly and actuating and sequence timing means engaging said first and second pivotal means for controlling the sequence and timing of the operations and providing the energy for indexing and for doctoring.
Claim 2
Dependent Claim
138 words
A doctoring apparatus for uninterrupted doctoring of material from a moving belt comprising a multiple-bladed doctor assembly rotatably mounted and provided with means for indexing said assembly by rotating said assembly in the same direction of rotation as the moving belt to provide a new blade in doctoring position, a single blade for doctoring during the indexing operation of the multiple-bladed assembly, a first pivotal means engaging said multiple-bladed doctor assembly for moving said assembly in and out of doctoring position, a second pivotal means engaging said single blade for moving said blade in and out of doctoring position during the indexing operation of the multiplebladed assembly and actuating and sequence timing means engaging said first and second pivotal means for controlling the sequence and timing of the operations and providing the energy for indexing and for doctoring.
Claim 3
Independent Claim
196 words
An apparatus for uninterrupted doctoring of material from a moving belt, comprising: a. a supporting means for the apparatus; b. a multiple-bladed doctor assembly mounted on said supporting means and provided with ratchet and pawls for indexing said assembly by allowing said assembly to rotate in the same direction of rotation on the moving belt, thereby placing the next blade in sequence in doctoring position; c. a single blade mounted on the supporting means for doctoring during the indexing operation of the multiple-bladed assembly; d. a first pair of lever arms rotatably suspending at their lower ends the multiple-bladed doctor assembly, said lever arms being pivotally mounted on the supporting means for moving the multiple-bladed assembly in and out of doctoring position; e. a second pair of lever arms fixedly suspending at their lower ends the single doctor blade, said lever arms being pivotally mounted on the supporting means for moving the single blade in and out of doctoring position; f. an actuating and sequence timing means engaging said first and second pairs of lever arms, said means controlling the sequence and timing of the operations and providing the force needed for indexing and for doctoring.
Claim 4
Independent Claim
196 words
An apparatus for uninterrupted doctoring of material from a moving belt, comprising: a. a supporting means for the apparatus; b. a multiple-bladed doctor assembly mounted on said supporting means and provided with ratchet and pawls for indexing said assembly by allowing said assembly to rotate in the same direction of rotation on the moving belt, thereby placing the next blade in sequence in doctoring position; c. a single blade mounted on the supporting means for doctoring during the indexing operation of the multiple-bladed assembly; d. a first pair of lever arms rotatably suspending at their lower ends the multiple-bladed doctor assembly, said lever arms being pivotally mounted on the supporting means for moving the multiple-bladed assembly in and out of doctoring position; e. a second pair of lever arms fixedly suspending at their lower ends the single doctor blade, said lever arms being pivotally mounted on the supporting means for moving the single blade in and out of doctoring position; f. an actuating and sequence timing means engaging said first and second pairs of lever arms, said means controlling the sequence and timing of the operations and providing the force needed for indexing and for doctoring.
References Cited (Backward Citations)
DE1066949B
Cited
US2614707A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |