# US 10,309,594 B1 · Stack light > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,309,594 B1 - Document ID: US10309594B1 - Status: Granted - Kind: B1 - Application number: 15/583,314 - Filed: 2017-05-01 - Granted: 2019-06-04 - Earliest claimed: 2017-05-01 - Assignees: Mallory Sonalert Products, Inc. - Applicants: Christopher M. Baldwin; Mark T. Monnett - Inventors: Christopher M. Baldwin; Mark T. Monnett - Web page: https://patentgrep.com/patent/US10309594B1 ## CPC - H04R 1/2811: {for loudspeaker transducers} - F21V 23/003: {the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array} - F21V 23/06: the elements being coupling devices {, e.g. connectors} - H04R 1/028: {associated with devices performing functions other than acoustics, e.g. electric candles} - H04R 17/00: Piezoelectric transducers; Electrostrictive transducers (piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners {H10N30/00}) - F21V 33/0056: {Audio equipment, e.g. music instruments, radios or speakers} - F21W 2111/00: Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00 - F21Y 2107/90: on two opposite sides of supports or substrates - F21Y 2113/13: comprising an assembly of point-like light sources - F21Y 2115/10: Light-emitting diodes [LED] - H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K) - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - F21W: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS - F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED ## Abstract A stack light with a light section having a housing with a plurality of at least partially translucent side walls and having a plurality of opposing light sources on longitudinally opposite ends of the housing to produce a very even blended light. A stack light system with one or more such light sections also includes a sound section having a hollow housing and a set of interchangeable acoustic chambers configured for insertion into the hollow housing, each chamber including a piezoelectric transducer and having a side wall structure configured to abut an inner side wall surface of the hollow housing, the chamber, transducer and housing together defining a resonant cavity. In one embodiment, an acoustic chamber has a longitudinally extending side wall and a substantially closed end wall, the side wall having adjacent the end wall a plurality of wide lateral openings spaced apart along its perimeter, the openings each having a width in the range of approximately 8-25% of the wavelength of the piezoelectric transducer's fundamental frequency. ## Claims ### Claim 1 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; wherein each end of said light section housing has an end wall extending transversely between said side walls with a plurality of light sources peripherally mounted on an inner surface thereof, each end wall being a printed circuit board including multiple LEDs and an LED drive circuit, said light section including a plurality of conductors electrically interconnecting said spaced circuit boards; further comprising a second light section, wherein one of said printed circuit boards is an interface between said light sections and has different color LEDs on opposite sides thereof. ### Claim 2 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. ### Claim 3 (depends on 2) The stack light of claim 2, wherein said light and sound sections have a generally polygonal transverse cross-section. ### Claim 4 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. ### Claim 5 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. ### Claim 6 (depends on 5) The system of claim 5, wherein said acoustic chambers contain said piezoelectric transducers at different respective positions. ### Claim 7 (depends on 6) The system of claim 6, wherein each acoustic chamber includes axially aligned first and second portions of different internal width. ### Claim 8 (depends on 7) The system of claim 7, wherein said first and second chamber portions are internally generally cylindrical, said first portion having a smaller internal diameter and located between said piezoelectric transducer and said second portion. ### Claim 9 (depends on 8) The system of claim 8, wherein said first and second chamber portions adjoin each other and said acoustic chamber has a transverse wall at the junction thereof, with an annular flange extending axially from said transverse wall and defining said first chamber portion, and said transducer is nodally mounted on said annular flange. ### Claim 10 (depends on 9) The system of claim 9, wherein said side wall structure of each acoustic chamber defines a plurality of lateral openings equiangularly spaced about said axis; and wherein said hollow housing has a substantially closed end wall and an adjoining side wall structure having a plurality of lateral openings adjacent said end wall and radially aligned with said acoustic chamber lateral openings. ### Claim 11 (depends on 5) The system of claim 5, wherein said side wall structure of each acoustic chamber defines a plurality of lateral openings equiangularly spaced about said axis; and wherein said hollow housing has a substantially closed end wall and an adjoining side wall structure having a plurality of lateral openings adjacent said end wall and radially aligned with said acoustic chamber lateral openings. ### Claim 12 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. ### Claim 13 (depends on 12) The stack light of claim 12, wherein said sound section includes an external housing enclosing an open-ended acoustic chamber core, with said side wall a part of said core and said end wall a part of said external housing. ### Claim 14 (depends on 13) The stack light of claim 13, wherein said end wall is flat and the space enclosed within said acoustic chamber by said transducer, side wall and end wall is free space. ### Claim 15 (depends on 14) The stack light of claim 14, wherein said external housing has a plurality of grilles radially aligned with said lateral openings in said acoustic chamber side wall. ### Claim 16 (depends on 15) The stack light of claim 15, wherein said light and sound sections have a generally polygonal transverse cross-section. ### Claim 17 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. ### Claim 18 (depends on 17) The stack light of claim 17, wherein said acoustic chamber includes axially aligned first and second portions of different internal width. ### Claim 19 (depends on 18) The stack light of claim 18, wherein said first and second chamber portions are internally generally cylindrical, said first portion having a smaller internal diameter and located between said piezoelectric transducer and said second portion. ### Claim 20 (depends on 19) The stack light of claim 19, wherein said first and second chamber portions adjoin each other and said acoustic chamber has a transverse wall at the junction thereof, with an annular flange extending axially from said transverse wall and defining said first chamber portion, and said transducer is nodally mounted on said annular flange. ### Claim 21 (depends on 20) The stack light of claim 20, wherein said side wall structure defines a plurality of lateral openings equiangularly spaced about said axis; and wherein said hollow housing has a substantially closed end wall and an adjoining side wall structure having a plurality of lateral openings adjacent said end wall and radially aligned with said acoustic chamber lateral openings. ### Claim 22 (depends on 17) The stack light of claim 17, wherein said side wall structure defines a plurality of lateral openings equiangularly spaced about said axis; and wherein said hollow housing has a substantially closed end wall and an adjoining side wall structure having a plurality of lateral openings adjacent said end wall and radially aligned with said acoustic chamber lateral openings.