Communications: electrical – Condition responsive indicating system – Specified housing
Reexamination Certificate
2000-05-17
2001-11-13
Trieu, Van T. (Department: 2632)
Communications: electrical
Condition responsive indicating system
Specified housing
C340S693500, C340S693900
Reexamination Certificate
active
06317054
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a fire warning device.
The invention thus relates to a fire warning device of the kind which includes two shell parts, or shell parts, that can be detachably united to form a shell or shell that houses the sensor, alarm emitter and power source of the warning device, said shell being provided with means which enable the device to be suspended in the room of a building.
Such fire warning device are normally fitted high up in the room of a building, for instance high up on a wall or to the ceiling of said room.
Many house owners or apartment dwellers find the work of fitting such fire warning device in the prescribed and preferred position difficult to carry out. One further, troublesome drawback is that the walls and ceilings of dwelling places are often comprised of hard material (such as concrete) or of a fragile, weak material. Drawbacks of this nature have often caused the occupants of houses, apartments and other dwelling places to refrain from acquiring and fitting a fire warning device, against their better judgment.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a fire warning device that includes a means of suspension that greatly facilitates and simplifies fitting of the fire warning device in a correct or acceptable position in a dwelling place. Another object of the invention is to provide a fire warning device that includes a suspension means that does not require the use of fasteners and obviates the need of drilling/plugging surfaces on which the device is to be fastened and of driving fasteners (screwing or nailing) into such surfaces and which does not require the use of adhesive device for suspending the fire warning device.
The object of the invention is thus to provide a fire warning device that includes suspension means that will not damage the ceilings, interior wall surfaces on which the fire warning device is hung, not even when moving the fire warning device to a different location.
These objects are achieved in accordance with the invention, by means of the fire warning device that includes detachably connectable shell parts which when united form a shell. The shell houses a fire sensor, an alarm emitter and a power source. The shell is also provided with suspension means. The suspension means comprises a friction anchoring device disposed in the region of a boundary surface or interface between the two shell parts when the two shell parts are united. Additionally, the friction anchoring device is disposed in a passageway that extends between two mutually opposite ends of the closed shell, such as to enable the shell to be closed around a rod, cable or chain that carries a light fitting whilst connecting the cable, rod or chain to the friction anchoring device for suspending the fire warning device.
The fire warning device is a split shell structure that includes two parts which can be detachably united and which when joined together form an enclosure which houses the sensor, alarm emitter and power source of the fire warning device. The means for suspending the fire warning device includes friction anchoring means disposed in the boundary surface or interface between the two connectable shell parts, said friction anchoring means being adapted to frictionally clamp the shell halves together while clamping a chain, rod or cable that carries a lighting fixture, such as to support the fire warning device on said cable, rod or chain.
In one embodiment, the friction anchoring device may consist of a plastic foam band or strap into which the cable, rod or chain is embedded when bringing the shell parts together.
The inventive fire warning device can be fitted high up beneath a ceiling quickly and easily, on a cable, chain or rod by means of which a light fitting is suspended from the ceiling.
In certain embodiments, the fire warning device may comprise two mutually identical shell halves which when joined together to form a rotational-symmetrical body about an axis along which the cable, rod, chain, extends.
These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout.
REFERENCES:
patent: 4004228 (1977-01-01), Mullett
patent: 4032707 (1977-06-01), Trenary
patent: 4694281 (1987-09-01), MxDermott et al.
patent: 2290900 (1996-01-01), None
Grönstedt Rickard
Olsson Michael
Jacobson & Holman PLLC
Trieu Van T.
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