Tyre pressure indicating appts. - has first position in which piston registers pressure and second position for acting as adaptor for external pressure source

摘要

The indicating apparatus is for measuring the pressure in a tyre and includes a housing adapted to be mounted on the tyre valve assembly. A plunger is supported within the housing for movement between an inoperable position where the tyre valve is closed and a first operate position wherein the valve is opened to permit fluid from the tyre to enter the housing. An indicator piston is supported within the housing for movement to register the pressure and is exposed to view through the housing. The apparatus further provides for movement of the plunger to a second operate position wherein the valve is opened to permit pressure from n external source to be transmitted to the tyre through the apparatus without having to remove the apparatus from the tyre valve assembly.