Sensitive fuse for fire alarm
AssigneeEvergard Fire Alarm Co., Inc.
InventorSidney Jacoby
Life of this patent
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Abstract
A sensitive fuse for fire alarms comprising an extremely thin heat collector disk of nickel or brass nickel plated material. A pair of phenolic resin copper laminated attachment strips are soldered to the disk to form a unitary fuse. One attachment strip is permanently soldered to the disk and the other strip is attached to the disk with a eutectic solder which is formulated to melt at a low, predetermined temperature. The phenolic resin end of each strip has a punched hole for attaching the fuse assembly to alarm valve lever arms. The thinness of the heat collector disk results in rapid transfer of heat to melt the eutectic solder. The phenolic portions of the attachment strips serve to insulate the heat sensitive portions of the fuse assembly from the remainder of the alarm device to increase sensitivity.
Claims11
In a sensitive fuse for a heat responsive device, the combination of
- a thin metallic plate to collect heat from the environment;
- an attachment strip removably connected to the plate
- said attachment strip comprising a non-ferrous metal strip and a non-metallic insulator laminated together;
- and
- fusible means responsive to heat to disconnect the attachment strip from the plate, said fusible means affixing the non-ferrous metal strip to the plate in the absence of heat.
The sensitive fuse of claim 2 further comprises a non-ferrous metal base interposed between the strip and the insulator.
Dependencies are inferred from the claim text.