Visible signaling sports whistle

{
  "publication_number": "US5507246A",
  "country": "US",
  "kind": "A",
  "title": "Visible signaling sports whistle",
  "abstract": "A mouth blown sports whistle includes a mouthpiece that communicates with a sound chamber and emits an audio signal when pressurized air is blown into the mouthpiece and a second chamber that communicates via a passageway with the sound chamber. A visual member is housed in the second chamber in a retracted position so as to be capable of extending through an opening therein to an extended position when pressurized air enters the second chamber from said sound chamber to thereby render a visual signal of the blowing of the whistle. The whistle may further include a check valve associated with the second chamber to temporally hold the visual member in its extended position after the extension thereof and also a release valve associated with the second chamber to permit the visual member to return to its retracted position to ready the whistle for another combined audio and visual signalling.",
  "claims": [
    "1. A mouth blown sports whistle comprising: a mouthpiece, a sound chamber that communicates with said mouth piece and emits an audio signal though an opening therein when pressurized air is blown into said mouthpiece, and a second chamber that communicates via a passageway with said sound chamber, a visual member housed in said second chamber in a retracted position so as to be capable of extending through an opening in said second chamber to an extended position when pressurized air enters said second chamber from said sound chamber, pressure retention means associated with said second chamber to temporally hold said visual member in said extended position after said extension thereof, and pressure release means associated with said second chamber to permit said visual member return to said retracted position after said extension thereof.",
    "2. The sports whistle of claim 1 wherein said visual member comprises a balloon and means to assist said balloon to return to said retracted position upon release of pressurized air holding it in said extended position.",
    "3. The sports whistle of claim 1 wherein said pressure retention means is a check valve associated with said passageway.",
    "4. The sports whistle of claim 1 wherein said pressure release means is a spring biased release valve."
  ],
  "cpc": [
    "G10K 5/00"
  ],
  "filing_date": "1994-11-07",
  "publication_date": "1996-04-16",
  "grant_date": "1996-04-16",
  "priority_date": "1994-11-07",
  "application_number": "US-33496794-A",
  "family_id": "23309657",
  "citations": [
    "DE159791C",
    "GB799799A",
    "US2730920A",
    "US3763591A",
    "US4291704A"
  ]
}