×

Apparatus for indicating tire pressure

  • US 4,476,803 A
  • Filed: 06/03/1983
  • Issued: 10/16/1984
  • Est. Priority Date: 06/03/1983
  • Status: Expired due to Term
0
Associated Cases
0
Associated Defendants
0
Product Citations
0
Petitions
12
Forward Citations
1
Assignment
First Claim
Patent Images

1. A tire monitor for use with a pair of pneumatic tires, comprising,an externally threaded, hollow spring tube means having first and second ends,a valve body threadably mounted on said first end of said spring tube means, having a hollow inner end which threadably receives said one end of said spring tube means, a diaphragm valve means mounted in said valve body at said one end of said spring tube means to define a first chamber in said valve body, said valve body having a first air passageway formed therein which communicates with said first chamber, a second air passageway formed therein which communicates with the interior of one of said tires and said first air passageway, a third air passageway formed therein which communicates with the interior of the other of said tires and said first chamber, and a fourth air passageway formed therein which communicates with said first chamber,valve means connected to said fourth air passageway to permit air under pressure to be selectively supplied to said fourth air passageway and said first chamber at times,said diaphragm valve means being movable between first and second positions, said diaphragm valve means sealing said first air passageway, when in its said first position, to prevent air communication between said second air passageway and said third air passageway,a spring guide slidably mounted in said spring tube means and having a first end adjacent one side of said diaphragm valve means, said spring guide having an open second end,a spring means received in said open second end of said spring guide,a spring adjustment screw threadably mounted in said spring tube means adjacent said second end for adjustably varying the compression of said spring means,an elongated display rod having one end secured to said spring guide and its other end slidably extending through said spring adjustment screw,a scale pan means operatively pivotally secured to said spring tube means at said second end thereof and extending therefrom,said display rod having its other end in operative engagement thereof with said scale pan means for causing the pivotal movement thereof,said scale pan means having a visual display portion comprising a plurality of generally rectangular display segments positioned in a side-by-side relationship,and a scale pan cover threadably mounted on said second end of said spring tube means enclosing said scale pan means,said scale pan cover having a generally rectangular window formed therein through which said display segments are visible for indicating the relative position of said diaphragm valve means with respect to said first air passageway,a display adjustment screw threadably mounted in said spring tube means at said second end,a rotatable barrel means mounted on said display adjustment screw and having its rotational axis disposed transversely with respect to said display rod,said scale pan means secured to said barrel means,said display rod engaging said barrel means to cause said barrel means and scale pan means to rotate in one direction, said barrel means being spring biased to yieldably urge said barrel means to rotate in a direction opposite to said one direction,rotation of said display adjustment screw causing said barrel means to be longitudinally movably adjusted.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×