Patent US3815710A successfully refreshed from Google Patents.
US3815710A
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Seismic sensing apparatus
Assignee: Maxton Manufacturing Co
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Filing: 1971-10-21
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Granted: 1974-06-11
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Expires: 1991-10-21
Abstract
Abstract Sensing circuitry to protect an elevator car from striking a dislodged counterweight or other structure wherein a seismic sensor is coupled through control circuitry to control the directional movement of the car. Upon the seismic sensor detecting a seismic or other disturbance of predetermined magnitude, with the car located adjacent to or above the counterweight only continued upward movement is permitted, and with the car located adjacent to or below the counterweight only continued downward movement is permitted.
Inventors
- 👤 W Shrum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:10
CPC Classifications
B; B66; B66B; B66B5/00; B66B5/02; B66B5/021; B66B5/022
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
80 words
In combination with vertical elevator structure, said elevator structure including a movable car, control circuitry for effecting operation of said car, a counterweight connected to said car, the improvement comprising; said control circuitry including sensing circuitry to detect a seismic disturbance of predetermined magnitude, said control circuitry including operation circuitry to effect normal operation of said car, said sensing circuitry being capable of altering said operation circuitry so that said car is not capable of passing directly adjacent said counterweight.
Claim 2
Dependent Claim
80 words
In combination with vertical elevator structure, said elevator structure including a movable car, control circuitry for effecting operation of said car, a counterweight connected to said car, the improvement comprising; said control circuitry including sensing circuitry to detect a seismic disturbance of predetermined magnitude, said control circuitry including operation circuitry to effect normal operation of said car, said sensing circuitry being capable of altering said operation circuitry so that said car is not capable of passing directly adjacent said counterweight.
Claim 3
Dependent Claim
141 words
The combination as defined within claim 1 including: said control circuitry including location circuitry, said location circuitry including a first circuit path and a second circuit path, first selector contact means coupled within said first circuit path to transmit energy when said car is located above said counterweight, a second selector contact coupled within said second circuit path to transmit energy when said car is located below said counterweight, with said car located above said counterweight said second selector contact being deactivated, with said car located below said counterweight said first selector contact being deactivated, whereby upon activation of said sensing circuitry with said car located above said counterweight only continued upward movement of said car being permitted, whereby upon activation of said sensing circuitry with said car located below said counterweight only continued downward movement of said car being permitted.
Claim 4
Dependent Claim
38 words
The combination as defined within claim 1 wherein: said sensing circuitry includes a seismic sensitive contact which is to be activated by a seismic disturbance of predetermined magnitude, said seismic sensitive contact being attached directly to said counterweight.
Claim 5
Dependent Claim
41 words
The combination as defined within claim 1 wherein: said sensing circuitry including a bypass circuit, said bypass circuit to be manually actuatable for effecting movement of said car thereby negating the effect of said seismic sensitive contact within said sensing circuitry.
References Cited (Backward Citations)
US3726364A
Cited
US3714456A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |