Torque tool tester machine

A torque tool testing machine including a case, a reaction device to hold a torque tool having a torque transmitting head and an applied torque indicating device in stationary position relative to the case, an electronic torque transducer with a torque transmitting device connected with the head and operating to emit a voltage that is proportional to torsional forces directed through it, a processor receiving and processing the voltage from the transducer and directing a voltage to a digital read-out device to cause that device to display the torsional forces directed through the transducer in digital force units;

• a reduction gear train comprising a series of related shafts and gears and including an out-put shaft in rotary driving engagement with the transducer, an input shaft with a manually engageable hand-wheel and at least one pair of related spur gear wheels on spaced apart parallel/shafts and each having elongate axially extending circumferentially spaced teeth that mesh when on a common tangential plane that extends between the gear wheels;
• stop means to stop advanced turning of the gear wheels in one direction and including a elongate plate with an outer-end portion, opposite sides, an elongate transversally extending inner-end parallel with the axes of the gears and oppositely disposed gear tooth engaging stop surfaces on planes that are parallel with said tangential plane;
• operating means connected with the plate to selectively move the plate between an outer position where it is spaced from interfering engagement with teeth on the gears to an inner position where its inner-end is stopped against one of the meshed teeth and where the advancing next to meshed teeth on the gears move circumferentially and inwardly into stopped engagement with their related stop surfaces of the plate;
• electric power drive means connected with and operable to drive the operating means to move the plate between its outer and inner positions, means connecting the drive means with the processor, the processor operates to cause the drive means to drive the operating means to move the plate from its outer position to its inner position when a voltage in the processor is reached that is proportional to the force directed through the transducer reaches a pre-determined set value.