ALARM SYSTEM FOR PNEUMATIC TIRES

• US 3,738,308 A
• Filed: 05/21/1971
• Issued: 06/12/1973
• Est. Priority Date: 05/21/1971
• Status: Expired due to Term

• Current Assignee: Safety Research & Engineering Associates
• Original Assignee: William A. Barabino
• Inventors: Barabino, William A.
• Primary Examiner(s): Capozi, Louis J.
• Application Number:
  US05/145,624
• Time in Patent Office: 753 Days
• Field of Search: 116/34,65,70,34B 73/146.3,146.8 340/63 137/223,226,227,225 152/415-431
• US Class Current: 116/34.00R
• CPC Class Codes: B60C 23/0403 Mechanically generated audible signals, e.g. by buzzer or whistle signals
• CPC Class Codes: B60C 23/0469 Transmission by sound, e.g. ultra-sound
• CPC Class Codes: F16K 37/00 Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
• CPC Class Codes: Y10T 137/3662 With gauge or indicator

Abstract

A system is provided for use with various types of vehicles employing pneumatic tires to signal the operator that the tire pressure is beyond a preset range. A spring-loaded pressure responsive piston is adapted to reciprocate within a valve structure in response to changes in tire pressure. If the piston is displaced one way or other beyond the predetermined range, air is released to operate a whistle detected by a sensing system on the vehicle which, in turn, generates a signal for the operator.

Claims

1. A pressure warning device for a pneumatic tire, comprising a. a housing formed with a cylindrical chamber therein one end of which being in communication with the interior of said tire and the opposite end thereof being exterior of said tire, b. a spring-loaded piston mounted in said chamber and being axially movable in response to changes in tire pressure, c. said piston being formed with a passage communicating with the interior of said tire, d. at least one of said housing and said piston being formed with a plurality of axially spaced ports and the other of said housing and said piston being formed with at least one port, the piston ports being in communication with said passage whereby excess movement of said piston will align certain of said ports to release air from said tire, e. whistle means communicating with said ports and actuated by release of air from said tire and, f. a check valve mounted directly to the outer end of said piston and communicating with said piston passage.

2. A pressure warning device according to claim 1 including an apertured cover removably mounted over the exterior portion of said housing and a movable member mounted to said cover and displaceable in response to release of air from said tire from a hidden position in said cover to an exposed position.

3. A pressure warning device according to claim 2 wherein said member is a whistle.

4. A pressure warning device according to claim 1 wherein said housing is formed with a restricted orifice at the inner end thereof.