Engine operating time measuring apparatus

An engine operating time measuring apparatus comprising:

• a housing defining a cavity;
• terminals means;
• said terminals means extending outside said housing for electrical connection with a monitored engine;
• said terminal means extending inside said housing for electrical connection with a printed wiring board carrying a power supply circuit for supplying operating power when the monitored engine is operating;
• clock movement means contained within said housing responsive to said operating power supplying means for generating a clock torque movement;
• said clock movement means including a case having positioning and locking members and a crystal-based clock movement motor assembly carried by said case and having a drive gear coupling said generated clock torque movement;
• mechanical counter means contained within said housing for indicating the engine operating time;
• said mechanical counter means including a frame having means for cooperating with said positioning and locking members for positioning and locking said clock movement means with said counter frame and said mechanical counter means including a plurality of numbered wheels;
• each numbered wheel having opposed gear surfaces;
• drive train means contained within said housing drivingly connected to said mechanical counter means for coupling said generated clock torque movement to said mechanical counter means;
• said drive coupling means operatively captured between said frame and said clock movement drive gear and a first one of said plurality of numbered wheels;
• said operating power supplying means, said clock movement means, said counter means and said drive coupling means being assembled together to form a subassembly;
• and said housing including keying and positioning means cooperating with said counter frame for accurately aligning and positioning said subassembly within said housing;
• and
• a dial plate fixedly secured to said housing, said counter means indicating the engine operating time through said dial plate.

An engine operating time measuring apparatus comprising:

• a housing defining a cavity;
• terminal means;
• said a printed wiring board carrying a power supply circuit, terminal means extending outside said housing for electrical connection with a monitored engine;
• said terminal means extending inside said housing for electrical connection with said printed wiring board supplying operating power when the monitored engine is operating;
• said printed wiring board having a pair of electrical contacts formed on said printed wiring board;
• said pair of electrical contacts being spaced apart and aligned for electrical engagement with said terminal means;
• clock movement means contained within said housing responsive to said operating power supplying means for generating a clock torque movement;
• said clock movement means including a case having positioning and locking members and a crystal-based clock movement motor means carried by said case and having a drive gear coupling said generated clock torque movement;
• mechanical counter means contained within said housing for indicating the engine operating time;
• said mechanical counter means including a frame having means for cooperating with said positioning and locking members for positioning and locking said clock movement means with said counter frame and said mechanical counter means including a plurality of numbered wheels;
• each numbered wheel having opposed gear surfaces;
• drive train means contained within said housing drivingly connected to said mechanical counter means for coupling said generated clock torque movement to said mechanical counter means;
• said drive coupling means operatively captured between said frame and said clock movement drive gear and a first one of said plurality of numbered wheels;
• said operating power supplying means, said clock movement means, said counter means and said drive coupling means being assembled together to form a subassembly;
• a dial plate fixedly secured to said housing, said dial plate having a viewing window and said counter means indicating the engine operating time through said viewing window;
• said housing including a plurality of keying and positioning rails formed within the housing cooperating with said counter frame for accurately positioning and retaining said subassembly in said housing;
• and
• a stop surface defined in at least one of said keying and positioning rails for accurately positioning said pair of electrical contacts formed on said printed wiring board with said terminal means.