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4148023 |
Emergency exit indicator
An emergency exit indicator that will signal the location of an emergency exit by a high intensity smoke piercing light and audible alarm, becoming activated automatically when smoke reaches a...
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4148022 |
Chemical smoke or pollutant detector
A smoke or pollutant sensor has first and second conductors in non-electrical contact and a coating, between the first and second conductors, which chemically reacts with by-products of combustion...
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4146803 |
Fire-responsive control device utilizing thyristors
In a thyristor fire-responsive control device including a fire detector which has a thyristor as output switching means, a control circuit is responsive to the detector. A controlled apparatus is...
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4142219 |
Two-wire system including signal receiving section and detection section with protected relay
Disclosed is a two-wire system including a power source, a signal receiving section and a sensing device in series which supplies electric power to and receives sensing signals from signaling...
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4141007 |
Central alarm conditioning detecting and alerting system
A central smoke detector alarm system, for a multiple floor, multiple dwelling apartment building, which utilizes the existing components of the fire alarm system found in such buildings....
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4138670 |
A.C. powered detecting device with battery backup
An improved a.c. voltage powered warning device for detecting the occurrence of predetermined phenomena, is characterized by battery backup for providing power to the device in the event of...
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4119419 |
Smoke controlling ash tray
An ash tray comprising a housing having a passageway on the upper end thereof communicating with the interior of the housing, with support means operatively associated with the housing for...
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4097851 |
Sensitivity compensated fire detector
A fire detector of the ionization type is characterized by sensitivity compensating circuitry. The detector includes an ionization chamber in series circuit with a reference impedance to form a...
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4092641 |
Security interlock switch system for smoke detectors and the like
Attempts to pilfer or tamper with condition detector structures such as smoke detectors, intrusion detectors or the like are discouraged by incorporating switch apparatus within the enclosure for...
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4090178 |
Combination smoke detector and lamp structure
Structure for combining at one location smoke detection circuitry and wall or ceiling lamp apparatus. The structure includes a housing formed with a bottom wall and side walls and having an opening...
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4088986 |
Smoke, fire and gas alarm with remote sensing, back-up emergency power, and system self monitoring
A system for sensing smoke and fire, primarily through the sensing of associated carbon monoixide and optionally with supplementary heat sensing, and for sensing hazardous gases and vapors. The...
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4084157 |
Smoke and heat detector alarm
A smoke and heat detector alarm including a compressed gas, self contained, stored energy source. A T-fitting connects to the compressed gas tank through a fusible element activated valve and feeds...
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4079786 |
Fire extinguishing system
The invention herein relates to improvement in a fire extinguishing system which is arranged and constructed to cover a room area with a mist spray. The improvement herein consists in providing...
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4079271 |
Alarm driver for a smoke detector
An alarm driver is described providing an audio frequency signal for operating the alarm of a smoke detector. The driver comprises a four transistor bridge in which the transistor input bias is...
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RE29580 |
Integrated fully supervised fire alarm system
A low voltage audio fire alarm system fully integrated in a paging and music speaker system. The alarm circuits including pull-boxes and automatic fire, smoke and heat detection apparatus and the...
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4074225 |
Emergency detection alarm and evacuation system
An emergency detection alarm and evacuation system adapted for use in a multi-storied building comprises a plurality of spatially distributed fire/smoke detectors and a plurality of exit signalling...
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4053785 |
Optical smoke detector with smoke effect simulating means
Smoke detection apparatus including a pair of photoelectric cells which receive illumination in a predetermined ratio from a very low level light source. An improved simulating device is included...
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4032707 |
Housing for battery-operated device
A housing contains electrical components that constitute a battery-operated smoke detector and alarm. Forming a part of the housing is a transverse wall that includes at least one opening. Adjacent...
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4024928 |
Fire escape installation
A fire escape unit for installation in buildings such as hospitals includes a hinged platform upon which a movable load such as a bed to be evacuated in an emergency is mounted. The hinged end of...
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4005754 |
Process for the automatic reporting and extinguishing of fires
A process for the automatic reporting and extinguishing of fires and an automatic fire reporting and extinguishing system capable of performing such process are provided. The process uses at least...
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4004288 |
Battery operated fire detection unit
A battery operated fire detection unit that is capable of independent monitoring through sensing of smoke with the unit maintaining monitoring capabilities over long periods of time. A smoke...
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3978476 |
Circuit conduction test arrangement for emergency alarm systems
Circuit conduction test arrangement for emergency alarm systems having a receiving panel for a group of several sections to be supervised and including common alarm means, and a plurality of relay...
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3968483 |
Burglar and fire alarm system
A security alarm system for a building includes rechargeable battery-operated alarm circuitry, with the system including a burglar alarm in conjunction with an entrance door. Inside switches...
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3952808 |
Fire protection systems
A protection system for use in the detection of smoke etc. from one or more of a plurality of locations and the subsequent release of an extinguishant into these locations comprising a control unit...
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3950739 |
Detector for detecting and locating the source of a contaminating gas or smoke in the atmosphere
The invention involves an apparatus and method. It has for a purpose the detection of a contaminating gas or smoke in the free and unconfined atmosphere and for locating the source of the...
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3938115 |
Combination smoke and heat detector alarm
A combination smoke and heat detector alarm including a self contained stored energy source in the form of a cylinder of compressed gas. A T-fitting connects to the cylinder and feeds separate...
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3931462 |
Stack plume visualization system
This invention is method and apparatus for measuring, at a remote location, the concentration and velocity of SO 2 in plume from a smokestack. An ultraviolet video system views the plume against...
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3930247 |
Open screen smoke detector and circuit
Herein disclosed is a particularly sensitive smoke detector system featuring a solid state sensor having a wide-mesh screen and employing a warning device in circuit with the anode-cathode path of...
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3908309 |
Particulate products of combustion detector for closure frame
A door frame having a head member defining the top of a door opening with the head member optionally supporting an electrically actuated door holder-closer. A module having a frame shell section...
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3900795 |
Installation and test tool for ionization smoke detector
In the present invention a ceiling mounted smoke detector assembly has a permanently mounted ceiling fixture portion and a detachably mounted smoke detector head adapted for mounting to the fixture...
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3899732 |
Method and apparatus for monitoring battery energy level
A fire detection apparatus operates to self-monitor the energy level of a cell or battery powering it by periodically comparing a first signal, which is a function of the unloaded battery output...
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3896422 |
Alarm system operated by ambient conditions
A pilot flame is extinguished when combustion products or gases other than oxygen enter the upper end of a protectively enclosing stack to reduce the supply of oxygen to the flame. A flame...
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3895367 |
Gas indicator with semiconductive gas sensor
A gas indicator provided with a gas sensor consisting of a semiconductive body incorporating two spaced electrodes. The body may be heated by means of one of the electrodes which is shaped as a...
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3892930 |
Loudspeaker enclosure
Enclosure and mounting for a loudspeaker is combined with enclosure and mounting for an ionization sensor, a printed circuit board and a battery. The battery and portions of the front portion and...
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3884304 |
FIRE SAFETY SYSTEMS
Conventional water sprinkler heads, mounted in separate rooms, are set off by smoke detectors respectively mounted in the same rooms. A sprinkler head is set off by connecting a resistance wire...
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3882477 |
Smoke and heat detector incorporating an improved smoke chamber
A novel smoke and heat detector incorporating an improved smoke chamber. The smoke detector includes a radiation detector mounted orthogonally to a radiation source emitting a beam of non-visible...
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3882478 |
Gas and smoke alarm
An alarm has a frame covered by a translucent detachable U-shaped cover. The frame supports a transformer and an alarm horn. A post supports a circuit board holding a semiconductor sensor and the...
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3872419 |
ELECTRICAL ELEMENTS OPERABLE AS THERMISTERS, VARISTERS, SMOKE AND MOISTURE DETECTORS, AND METHODS FOR MAKING THE SAME
Electrical elements comprising a metal substrate, a ceramic semiconductor applied thereon and an outer conductive coating. The metal substrate may be a ferrous metal, preferably stainless steel,...
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3860919 |
SMOKE AND GAS DETECTION AND ALARM APPARATUS
An improved Taguchi Gas Sensor type detection and alarm system for smoke, gases or the like, which is particularly adapted for use in environments where the only available source of electrical...
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3826180 |
VENTILATION FAN SYSTEM WITH SMOKE DETECTOR SPEED CONTROL
This invention relates to a ventilator wherein an electronic circuit is actuated when a detecting element detects the existence of any smoke or gas while a fan is in a manually selected slow...
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3811123 |
LOW ENERGY INDICATOR
A low energy indicator circuit disclosed as part of a smoke detection system and giving a pulsating alarm when the strength of the DC energy source diminishes below a preset reference level. The...
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3801972 |
GAS ANALYZER CIRCUITRY
Apparatus for detecting and indicating the presence of substances such as smoke and combustible gasses. One or more detectors generate output signals which are applied to a comparator amplifier....
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3795899 |
CONDITION MONITORING APPARATUS
A system for indicating how many minutes of excess smoke emission have occurred during a predetermined time interval, e.g., an hour, includes an accumulator for storing the time duration value of...
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3786502 |
SECURITY SYSTEM
An integrated security system including a microswitch monitored, alternating current receptacle adapted to be mounted in a standard wall-box and further adapted to receive a standard two-prong plug...
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3775761 |
FIRE DETECTING SYSTEM WITH SPURIOUS SIGNAL REJECTION
A fire detecting system having a plurality of fire detectors connected across conductors for applying a voltage thereto. The detectors each include switching means which is closed upon operation of...
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3750123 |
SMOKE SENSING CIRCUIT WITH BATTERY STANDBY
A fire and gas alarm system utilizing a four-terminal sensing device positioned in the environmental region to be monitored. The sensing device includes a pair of resistance heating wires spaced...
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3728615 |
SMOKE, GAS, OR RAPID TEMPERATURE INCREASE DETECTOR UTILIZING A PERIODIC ELECTRIC FIELD TO CREATE A SELF-SUSTAINED AVALANCHE CURRENT
A method and apparatus for detecting smoke, gaseous products of combustion such as CO, CO 2 , and a rapid temperature rise, the method including the steps of periodically forming, in a location...
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3693401 |
APPARATUS FOR CHECKING OPERATION OF SMOKE DETECTORS
A testing device for smoke detectors wherein a housing is placed over the detector under test and a test medium is sprayed into the housing. The smoke detector responds to the test medium to...
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3678487 |
MULTI-ZONE INCIPIENT OR ACTUAL FIRE AND/OR DANGEROUS GAS DETECTION SYSTEM
A multi-zone detecting system for incipient or actual fires and/or dangerous gas accumulations comprising a multi-zone sampling system for obtaining samples of the atmosphere of the respective...
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3665461 |
APPARATUS FOR MONITORING THE CONDUCTORS OR LINES OF FIRE ALARM INSTALLATIONS
An apparatus for supervising the continuity of the conductors of an alarm installation, especially a fire alarm installation, comprising a central signal station and a plurality of fire alarms each...
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