Patent US3720295A successfully refreshed from Google Patents.
US3720295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power positioning apparatus with force dependent shut-off
Assignee: Helmut Bälz GmbH
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Filing: 1971-11-19
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Granted: 1973-03-13
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Expires: 1991-11-19
Abstract
Abstract A HOUSING DEFINES THEREIN A CHAMBER THROUGH WHICH A MOTOR DRIVEN SPINDLE PASSES WHICH, WHEN AN ELEMENT CONNECTED THERETO STRIKES AN ABUTMENT WITH PREDETERMINED FORCE, CAUSES THE MOTOR TO SHUT OFF. THE SPINDLE IS HELD IN THE HOUSING IN AXIALLY MOVABLE BALL BEARINGS WHICH ARE SPREAD APART BY A SPRING. A SLEEVE SURROUNDS THE SPINDLE, THE SLEEVE HAVING AT LEAST ONE CAM THEREON. IF THE SPINDLE IS SUBJECT TO EXCURSION, AN AXIALLY MOVING BALL BEARING (AGAINST THE FORCE OF THE SPRING) WILL FRICTIONALLY ENGAGE THE SLEEVE, CAUSING ITS ROTATION, AND THE CAM TO ENGAGE A SHUT OFF SWITCH.
Inventors
- 👤 J Balz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:50
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/02; F16K31/04; F16K31/047; F16K31/048
Claims Analysis
Total Claims: 0
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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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |