Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1977-09-02
1980-04-15
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
128214E, 177 48, 177251, 222 39, 340384E, G08B 2100
Patent
active
041986261
ABSTRACT:
An intravenous alarm device provides an alarm signal to indicate that a predetermined amount of liquid remains in a liquid dispensing container of the type such as an I.V. bottle or bag adapted to be suspended from an arm. The device includes an attitude-sensitive transducer such as a mercury switch defining a reference axis, and the alarm signal is given when the reference axis extends along a line in predetermined angular relationship with the horizontal. The device further includes a structure supporting the transducer, with the structure including, at a first point thereof, a hanger portion to suspend the device from such an arm; at a second point thereof, a holding portion to suspend the container from the device; and, at a third point thereof, a device center of gravity. The first, second, and third points are spaced to define vertices of a triangle. In use, the structure orients the reference axis at an angle relative to the horizontal with the instantaneous angle being dependent upon the weight of the liquid remaining in the suspended liquid container.
REFERENCES:
patent: 1511404 (1924-10-01), Fiedler
patent: 2160276 (1939-05-01), McKee
patent: 3759337 (1973-09-01), Luedke et al.
patent: 3885639 (1975-05-01), McLarrin
patent: 3922672 (1975-11-01), Birt et al.
patent: 3977567 (1976-08-01), Rudd
patent: 4095658 (1978-06-01), Kendall et al.
Caldwell Sr. John W.
Myer Daniel
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