Stack light

An industrial stack light indicator device, comprising:

• an industrial indicator device light section having a housing with a plurality of at least partially translucent side walls and a plurality of opposing light sources of like color on longitudinally opposite ends of said housing;
• further comprising a sound section on a common longitudinal axis with said light section, said sound section having a housing and a sound generating element within said housing, said housing and sound generating element together defining a resonant cavity having at least one orifice open to the environment, wherein said sound section housing has a substantially closed end wall and an adjoining side wall structure having a plurality of lateral openings adjacent said end wall and equiangularly spaced about said axis.

A stack light system with stacked light and sound sections aligned on an axis, comprising:

• a light section having a housing with a light source therein;
• a sound section having a hollow housing and a set of differently configured interchangeable acoustic chambers configured for insertion into said hollow housing, each chamber including a piezoelectric transducer and having a side wall structure distinct from said piezoelectric transducer and configured to abut an inner side wall surface of said housing, said chamber, transducer and housing together defining a resonant cavity, said set of differently configured acoustic chambers including acoustic chambers with different size internal chambers within the space defined by said side wall structure.

A stack light system with stacked light and sound sections aligned on an axis, comprising:

• a light section having a housing with a light source therein;
• a sound section having a hollow housing and a set of interchangeable acoustic chambers configured for insertion into said hollow housing, each chamber including a piezoelectric transducer and having a side wall structure configured to abut an inner side wall surface of said housing, said chamber, transducer and housing together defining a resonant cavity,
• wherein said side wall structure of each acoustic chamber includes a plurality of flat outer surfaces and said hollow housing includes a matching plurality of flat inner surfaces.

A stack light with light and sound sections on a common longitudinal axis, comprising:

• a light section having a housing with a light source therein;
• a sound section having an acoustic chamber with a piezoelectric transducer, a longitudinally extending side wall, and a substantially closed end wall, said side wall having adjacent said end wall a plurality of wide lateral openings spaced apart along its perimeter, said openings each having a width in the range of approximately 8-25% of the wavelength of the piezoelectric transducer's fundamental frequency.

A stack light with light and sound sections aligned on an axis, comprising:

• a light section having a housing with a light source therein;
• a sound section having a hollow housing and an acoustic chamber configured for insertion into said hollow housing, said chamber including a piezoelectric transducer and having a side wall structure configured to abut an inner side wall surface of said housing, said chamber, transducer and housing together defining a resonant cavity,
• wherein said side wall structure includes a plurality of flat outer surfaces and said hollow housing includes a matching plurality of flat inner surfaces.