US3776475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic pulp grinder control
Assignee: Saint Gobain Abrasives Inc
•
Filing: 1972-07-17
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Granted: 1973-12-04
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Expires: 1992-07-17
Abstract
Abstract An automatic water shower flow control for a paper pulp grinding machine for control of pulp quality wherein the shower flow is regulated in accordance with the power input to the pulp grinding means.
Inventors
- 👤 J Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:44
CPC Classifications
D; D21; D21B; D21B1/00; D21B1/04; D21B1/12; D21B1/14; D21B1/18; D21B1/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
147 words
A pulpstone grinder for separating fibres from wood comprising a motor for rotating a pulpstone, means to press wood to be ground against a portion of the surface of the pulpstone, a quality control shower means, a source of fluid under pressure to be fed to the shower for delivery by the shower to the portion of the pulpstone surface having an interface with the wood, variable power supply means to drive the motor, a throttle valve between said fluid source and said shower means, and a proportional flow controller means operatively connected between said power supply and said throttle valve and responsive to variations of said power supply to feed more fluid to said interface portion of the pulpstone as the power delivered to the motor increases and to decrease the quantity of fluid feed to the interface when the power delivered to the motor decreases.
Claim 2
Dependent Claim
147 words
A pulpstone grinder for separating fibres from wood comprising a motor for rotating a pulpstone, means to press wood to be ground against a portion of the surface of the pulpstone, a quality control shower means, a source of fluid under pressure to be fed to the shower for delivery by the shower to the portion of the pulpstone surface having an interface with the wood, variable power supply means to drive the motor, a throttle valve between said fluid source and said shower means, and a proportional flow controller means operatively connected between said power supply and said throttle valve and responsive to variations of said power supply to feed more fluid to said interface portion of the pulpstone as the power delivered to the motor increases and to decrease the quantity of fluid feed to the interface when the power delivered to the motor decreases.
Claim 3
Dependent Claim
71 words
A grinder like that described in claim 1 wherein the grinder has two wood containing pockets for delivery of separate charges of wood to approximately oppositely disposed surfaces of the pulpstone and two separate quality control shower means one each positioned adjacent the oppositely disposed portions of the pulpstone at a point where said potions are about to come in contact with the wood in each one of the respective pockets.
Claim 4
Dependent Claim
77 words
A grinder as described in claim 2 wherein the grinder includes two cleaning and cooling shower means that are operatively positioned to act on oppositely positioned portions of the pulpstone immediately after those portions leave the pockets, and said two separate quality control shower means are positioned closely adjacent to said pockets such that the controlled fluid deposited on the surface portions of the pulpstone is carried immediately into the interface zones between the wood and pulpstone.
References Cited (Backward Citations)
US3690568A
Cited
US3693891A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |