Improvement in Hoisting Apparatus¶
Otis, E. G. (1861). Improvement in Hoisting Apparatus.
Cited by¶
3 citations across 3 artifacts.
Each citation links to the sentence it supports in the citing article.
Primes¶
- Boundedness
- Listed in the references but not attached to a specific claim.
- Containment
- Listed in the references but not attached to a specific claim.
- Fail-Safe
- The practice originated in mechanical safety systems (elevator brakes, train dead-man's switches, pressure relief valves in the 19 century) and has evolved into a foundational principle across every domain with critical safety requirements: aviation (runaway-trim disable, autopilot disengagement), nuclear engineering (passive cooling, gravity-driven emergency shutdown), medical devices (pacemakers reverting to fixed rate on sensor failure), cybersecurity (deny-by-default authorization, circuit breakers, default encryption), software engineering (transaction rollback, safe mode), and industrial safety (interlocks, emergency stops)
This sourceThe first elevator safety catch: a wagon-spring linkage that, on loss of cable tension (cable break), springs outward into toothed guide-rails and arrests the falling platform — a passive, signal-loss-triggered safe state.
Supported in partVerified against the work's full text
Otis's 1861 patent shows a spring-driven catch that engages when the hoist rope breaks, an early mechanical elevator safety device.
“Incase the rope G should breakin hoistin the loaded platform D, the pawls ff, in conse- -qu-ence of being released from the pull of said rope, will immediately be thrown in co'nnection with the racks U C by the springs”
- The practice originated in mechanical safety systems (elevator brakes, train dead-man's switches, pressure relief valves in the 19 century) and has evolved into a foundational principle across every domain with critical safety requirements: aviation (runaway-trim disable, autopilot disengagement), nuclear engineering (passive cooling, gravity-driven emergency shutdown), medical devices (pacemakers reverting to fixed rate on sensor failure), cybersecurity (deny-by-default authorization, circuit breakers, default encryption), software engineering (transaction rollback, safe mode), and industrial safety (interlocks, emergency stops)
Verification¶
Does it exist? Not checked yet. This entry carries no identifier to resolve. It was extracted from the citation as written in the article, normalized, and deduplicated against the rest of the registry.
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Registry ID ref:34c1e31a4ea5 · see in the full table