Signals and indicators – Horns – whistles and compressional wave generators – Diaphragm horns
Patent
1976-02-27
1977-02-15
Woodiel, Donald O.
Signals and indicators
Horns, whistles and compressional wave generators
Diaphragm horns
116137R, G10K 918
Patent
active
040077039
ABSTRACT:
A two-tone signal generator, serving as a horn for automotive vehicles, crises two complementary half-shells whose interior is divided by a common partition into two convoluted wind channels of different length resonating at different frequencies and opening into a common outlet. The inlet to the wind channels comprises a central duct with two lateral branches terminating at a pair of nipples to which a hose from an air blower can be selectively fitted; the junction of the branches with the central duct is an enlarged space containing a freely movable rubber ball which automatically blocks one nipple when air is admitted through the other nipple. The duct communicates with the two wind channels via respective lateral chambers formed in the two half-shells, each chamber being partly closed toward the outside by a lid provided with an eccentric air slot. The two air slots, flanked by splash shields, are disposed at diagonally opposite locations and communicate with drains and an inter-chamber passageway facilitating the discharge of moisture which may penetrate from the outside into the instrument. The two half-shells have confronting peripheral grooves that extend over an arc of approximately 120.degree. and receive a slider by which the instrument may be attached in various positions to an external mounting.
REFERENCES:
patent: 3477405 (1969-11-01), Jensen
Corr Denis E.
Dubno Herbert
F.I.A.M.M. Fabbrica Italiana Accumulatori Motocarri Montecchio S
Ross Karl F.
Woodiel Donald O.
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