| 摘要 |
<p>615,661. Pneumatic tyre pressure gauges. YANEZ Y MARTINEZ DEL CAMPO, A. FERNANDEZ-, and YANEZ Y OZORES, J. FERNANDEZ-. March 19, 1946, No. 8564. Convention date, Aug. 1, 1945. [Class 106 (ii)] Apparatus for indicating pressure in a pneumatic tyre comprises a closed cylinder 5 mounted on a wheel of a vehicle, one end of the cylinder being connected by a pipe 1 to the inner tube of the tyre and the other end being provided with axially spaced electrical contacts 20, 21 and a piston 4 slidable within the cylinder having a contact 15 thereon adapted to engage the contacts 20, 21, respectively, when the piston is moved in the cylinder to positions equivalent to maximum and minimum pressures, the tyre pressure on the piston being resisted by a spring 6, When the air pressure is excessive, the piston also uncovers non-return ball escape valves 10, 11 to allow air to escape. The contact 15 can move against the action of a spring 16 to prevent damage when the pressure is excessive, The piston has peripheral grooves 12 therein filled with oil to prevent air leakage. Screws 19, 22 engaging respectively contacts 20, 21 are connected by electric leads to sliding contacts or brushes on rings on the chassis which are connected to warning lamp circuits on the dashboard of the vehicle. In a modification, an elastic membrane is fitted to the lower end of the piston, and the air escape means is incorporated in the inflator valve of the tyre.</p> |
