Tire valve with pressure release means

• US 4,015,623 A
• Filed: 08/27/1975
• Issued: 04/05/1977
• Est. Priority Date: 11/05/1973
• Status: Expired due to Term

• Current Assignee: Uniroyal Goodrich Licensing Services Incorporated
• Original Assignee: Goodrich Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: Wanstreet, Gregory E.
• Primary Examiner(s): Weakley, Harold W.
• Application Number:
  US05/608,060
• Time in Patent Office: 587 Days
• Field of Search: 137/223, 137/224, 137/232, 137/512.3, 137/525.3, 137/543.21, 137/467, 137/557, 137/226, 220/89 A, 220/339, 220/203, 133/89, 133/89.1, 133/89.2, 133/89.3, 133/89.4, 116/34, 116/65, 116/125
• US Class Current: 137/224
• CPC Class Codes: B60C 23/0496 Valve stem attachments positioned outside of the tyre chamber
• CPC Class Codes: F16K 15/20 specially designed for inflatable bodies, e.g. tyres connecting valves to inflatable bodies B60C29/00
• CPC Class Codes: Y10T 137/36 With pressure-responsive pressure-control means
• CPC Class Codes: Y10T 137/374 With cap
• CPC Class Codes: Y10T 137/7846 Mechanically interconnected

Abstract

A valve assembly having a pair of flow passages in fluid communication with a chamber leading to a tire. One of the passages contains a typical one-way valve core mechanism while the other passage contains a pressure release mechanism. The cross sectional area of the tire inflation passage is less than the cross sectional area of the passage leading from the chamber to the pressure release bore. The exhaust port has a closure means which opens simultaneously with the pressure release mechanism. The closure means offers resistance to escaping inflation fluid which serves to urge the pressure release mechanism open against the biasing force of spring means urging it closed.

Claims

1. An inflating and pressure relieving tire valve assembly for use on a tire rim of a tire wheel assembly comprising an elongated valve body having a first portion attachment means;

said valve body having a pair of adjoining contiguous outwardly extending parallel open ended cylindrical portions, one being long and one short relative to each other;

a chamber within said body closely adjacent to the said first portion;

a tire connecting passage for communicating an inflating medium from said chamber;

an inflating passage in the long one of said cylindrical portions joining said open end with said chamber and having a valve core therein for communicating an inflating medium from a source of fluid pressure to said chamber;

a pressure relief passage in the short one of said adjoining cylindrical portions joining said open end with said chamber;

said pressure relief passage having a pressure exhaust port at one open end and a pressure release port at the other end providing fluid communication between said chamber and said exhaust port at one end of said relief passage to release excess inflating medium through said exhaust port to the atmosphere;

the cross-sectional area of said inflating passage being less than the cross-sectional area of said relief port;

a pressure release valve mechanism in said pressure relief passage operative to control flow of fluid therethrough;

pressure responsive means operative to close said valve mechanism at fluid pressures in said chamber less than a predetermined pressure and open said valve mechanism when fluid pressures in said chamber exceed said predetermined pressure;

said pressure release valve mechanism comprising a piston closely reciprocably received within said pressure relief passage;

said piston having recesses along the outer periphery for directing the flow of fluid thereby from said chamber to said exhaust port;

said piston being an elongated cylindrically shaped member with a cup-shaped centrally disposed bore;

said elongated piston mounted for linear movement in said pressure relief passage;

valve seat means at the end of said pressure relief port having a diameter that is less than the effective diameter of said piston;

sealing means on one end of said piston to sealingly engage said valve seat;

a press fit star washer in said pressure relief passage;

spring means seated in said bore of said piston and extending outwardly therefrom engaging said star washer for biasing said piston toward said valve seat to close said pressure relief passage from communicating with said chamber; and

an exhaust port dust cover and indicator means operatively interconnected by rod means with said valve mechanism to close said exhaust port when said valve mechanism is closed and open said exhaust port when said valve mechanism is open.

2. The tire valve assembly of claim 1 wherein said rod means comprises an operating rod secured to and extending outwardly from said piston through said exhaust port;

and said cover is mounted on said operating rod for movement therewith to cover said exhaust port to keep dust out.