Claims:GEAR DRIVEN DOUBLE BALANCE WHEEL SYSTEM AN ALTERNATIVE TO THE HAIRSPRING BASED TECHNOLOGY IN WATCHES.

INVENTOR: S N SHEIK UMAR SAHITH

Hairspring based balance wheels are used in watches more than 100 years. This is a time keeping and accuracy maintaining unit of mechanical watches. Though its function is good it is having following demerits. Hair spring has flexibility and vibration both horizontally and vertically. Its coiling and uncoiling tension varies. Similarly the balance wheel have to make an angle of ˜ 270 to 300 degrees per propulsion. The wheel also possess poising that has to be corrected. Entire assembly is kept in an axis having fine pinion and Inca bloc provided with jewels. It is easy to break.

To overcome this a double balance wheel system without hairspring has been designed. It consists of two equal size balance wheels and driven oppositely (Clockwise and anti-clockwise) by small gears (2 to 4) attached to the axis. The wheels have been skeletonized. The lower side of the upper wheel and upper side of the lower wheel possess a disc of flat gear that engage with the driving gears. The lower side of the upper wheel and upper side of the lower wheel possess propulsion pins. The numbers may varies from 4 to 8 depending upon the wheel size and time required. When the assembled wheels are exposed to Swiss lever it will start to beat and moves slowly along the axis of rotation. In this case the wheel rotates slowly 45 to 60 degree per beat depending upon the pin number. Since the movement of assembly is fixed it is free of gravity and the timing of the displacement can be controlled by frictional adjustment. There will not be any pinion breakage and no need of Inca bloc settings. Various other parameters have to be studied to standardize this model of movement.
, Description:GEAR DRIVEN DOUBLE BALANCE WHEEL SYSTEM AN ALTERNATIVE TO THE HAIRSPRING BASED TECHNOLOGY IN WATCHES.

INVENTOR: S N SHEIK UMAR SAHITH

Hairspring based balance wheels are used in watches more than 100 years. This is a time keeping and accuracy maintaining unit of mechanical watches. Though its function is good it is having following demerits. Hair spring has flexibility and vibration both horizontally and vertically. Its coiling and uncoiling tension varies. Similarly the balance wheel have to make an angle of ˜ 270 to 300 degrees per propulsion. The wheel also possess poising that has to be corrected. Entire assembly is kept in an axis having fine pinion and Inca bloc provided with jewels. It is easy to break.

To overcome this a double balance wheel system without hairspring has been designed. It consists of two equal size balance wheels and driven oppositely (Clockwise and anti-clockwise) by small gears (2 to 4) attached to the axis. The wheels have been skeletonized. The lower side of the upper wheel and upper side of the lower wheel possess a disc of flat gear that engage with the driving gears. The lower side of the upper wheel and upper side of the lower wheel possess propulsion pins. The numbers may varies from 4 to 8 depending upon the wheel size and time required. When the assembled wheels are exposed to Swiss lever it will start to beat and moves slowly along the axis of rotation. In this case the wheel rotates slowly 45 to 60 degree per beat depending upon the pin number. Since the movement of assembly is fixed it is free of gravity and the timing of the displacement can be controlled by frictional adjustment. There will not be any pinion breakage and no need of Inca bloc settings. Various other parameters have to be studied to standardize this model of movement.