English-metric dial assembly

A dial assembly for use in combination with a rotary-to-linear motion translating device to measure, in two different sets of units, movements of an element effected by said motion translating device, said assembly comprising,

• a rotatable shaft adapted to be secured to said motion translating device,
• a first scale means mounted upon said shaft and having a direct driving connection with said shaft, said first scale means having unit indicia thereon which is continuing when the first scale means moves through more than one complete revolution,
• a second scale means mounted for rotation relative to said shaft, said second scale means having unit indicia thereon which is continuing when the second scale means moves through more than one complete revolution, the unit indicia of said second scale means being demarked in a different unit of measure from the unit indicia of said first scale,
• gear train means mechanically interconnecting said first scale means to said second scale means, said gear train means including a pair of spur gears, said spur gears having different numbers of teeth and being drivingly connected to said first and second scale means, and
• a continuous toothed belt drivingly interconnecting continuous internally toothed belt maintained in driving interconnected relation with said pair of spur gears.