US3798672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple condition sensing and audio warning system
Assignee: JAB CO Inc
•
Filing: 1972-06-13
•
Granted: 1974-03-19
•
Expires: 1992-06-13
Abstract
Abstract An audio alarm system for monitoring mining operations, or the like, comprising a multi-track magnetic tape playing apparatus with a playback head selectively movable to any one of a plurality of track positions, an audio system connected to the output of the tape playing apparatus including speakers at selected locations, a plurality of condition sensors each providing a signal representative of a condition being sensed. A control circuit responsive to the condition signals initiates operation of the tape playing apparatus and positions the tape head relative to the proper track on a pre-recorded magnetic tape, whereby the audio message played corresponds to the sensed condition. Automatic shut down of a conveyor or other piece of mining equipment is effected at the same time.
Inventors
- 👤 J Gregg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:50
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/04; H04M11/045
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
159 words
In combination with a tape player having a single playback head selectively displaced between a plurality of positions operatively aligned with a plurality of tape tracks on which different messages are recorded, a warning system comprising a plurality of sensing devices for respectively monitoring different conditions; relay means energized by said sensing devices independently of the tape player for rendering the tape player operative; means connected to said sensing devices for selecting one of the positions to which the playback head is displaced when the tape player is rendered operative, corresponding to one of the recorded messages associated with the condition monitored by one of the sensing devices; time delay means energized simultaneously with the relay means for deenergizing the same and disabling the tape player after elapse of timed intervals during which the player is operative; and audio output means coupled to and energized independently of the tape player during said timed intervals for reproducing the recorded messages.
Claim 2
Dependent Claim
159 words
In combination with a tape player having a single playback head selectively displaced between a plurality of positions operatively aligned with a plurality of tape tracks on which different messages are recorded, a warning system comprising a plurality of sensing devices for respectively monitoring different conditions; relay means energized by said sensing devices independently of the tape player for rendering the tape player operative; means connected to said sensing devices for selecting one of the positions to which the playback head is displaced when the tape player is rendered operative, corresponding to one of the recorded messages associated with the condition monitored by one of the sensing devices; time delay means energized simultaneously with the relay means for deenergizing the same and disabling the tape player after elapse of timed intervals during which the player is operative; and audio output means coupled to and energized independently of the tape player during said timed intervals for reproducing the recorded messages.
Claim 3
Dependent Claim
24 words
The combination of claim 1 including shutdown control means connected to the relay means for preventing operation of external equipment during said timed intervals.
Claim 4
Dependent Claim
34 words
The combination of claim 2 including a source of electrical energy connected to the relay means, the time delay means and the audio output means for energizing the same independently of the tape player.
Claim 5
Dependent Claim
34 words
The combination of claim 1 including a source of electrical energy connected to the relay means, the time delay means and the audio output means for energizing the same independently of the tape player.
References Cited (Backward Citations)
US2571973A
Cited
US2804501A
Cited
US2991448A
Cited
US3015702A
Cited
US3226540A
Cited
US3209324A
Cited
US3310793A
Cited
US3388390A
Cited
US3375491A
Cited
US3573391A
Cited
US3582949A
Cited
US3634846A
Cited
US3581014A
Cited
US3713090A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |