Patent US3276557A successfully refreshed from Google Patents.
US3276557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine guards
Assignee: Individual
•
Filing: 1964-08-31
•
Granted: 1966-10-04
•
Expires: 1984-08-31
Abstract
No abstract record available.
Inventors
- 👤 Brown William James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:47
CPC Classifications
F; F16; F16P; F16P3/00; F16P3/02; F16P3/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A MACHINE TOOL GUARD HAVING A PLURALITY OF DETECTOR COMPONENT, EACH DETECTOR COMPONENT BEING PROVIDED WITH A CHANGEOVER SWITCH, SAID SWITCHES BEING CONNECTED IN PARALLEL TO CONTROL ENERGIZATION OF TOOL-ACTUATING MEANS, SAID ACTUATING MEANS INCLUDING A LATCHING RELAY AND A HOLDING RELAY, IN NORMAL OPERATION OF SAID TOOL SAID SWITCHES BEING ACTUATED BY THE DESCENT OF THE GUARD TO ITS FULL DOWNWARD POSITION TO ACT SIMULTANEOUSLY TO DEENERGIZE THE LATCHING RELAY AND ENERGIZE THE HOLDING RELAY, AND UNDER ABNORMAL CONDITIONS, WHEN THE COMPLETE DESCENT OF SAID GUARD IS PREVENTED, ACTUATION OF ONLY SOME OF SAID SWITCHES CAUSING SAID HOLDING RELAY TO ENERGIZE THUS PREVENTING THE ACTUATION OF THE TOOL.
Claim 2
Dependent Claim
109 words
A MACHINE TOOL GUARD HAVING A PLURALITY OF DETECTOR COMPONENT, EACH DETECTOR COMPONENT BEING PROVIDED WITH A CHANGEOVER SWITCH, SAID SWITCHES BEING CONNECTED IN PARALLEL TO CONTROL ENERGIZATION OF TOOL-ACTUATING MEANS, SAID ACTUATING MEANS INCLUDING A LATCHING RELAY AND A HOLDING RELAY, IN NORMAL OPERATION OF SAID TOOL SAID SWITCHES BEING ACTUATED BY THE DESCENT OF THE GUARD TO ITS FULL DOWNWARD POSITION TO ACT SIMULTANEOUSLY TO DEENERGIZE THE LATCHING RELAY AND ENERGIZE THE HOLDING RELAY, AND UNDER ABNORMAL CONDITIONS, WHEN THE COMPLETE DESCENT OF SAID GUARD IS PREVENTED, ACTUATION OF ONLY SOME OF SAID SWITCHES CAUSING SAID HOLDING RELAY TO ENERGIZE THUS PREVENTING THE ACTUATION OF THE TOOL.
References Cited (Backward Citations)
GB717031A
Cited
US3129799A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |