Patent ID: 8733258

Claim:
A metering device moveable between a first position and a second position, said metering device comprising: a metering chamber, a portion of said metering chamber defining an input sump for receiving inputs; a metering disc rotatable within said metering chamber when said metering device is in the first position to receive the inputs from said input sump and to discharge the inputs during rotation of the metering disc; and an obstruction within said metering chamber to retain the inputs already received within said input sump from moving from said input sump when said metering device is moving from the first position to the second position, wherein said obstruction comprises a substantially cylindrical fixed portion at least partially positioned between said input sump and an axis of rotation of said metering disc and surrounding said axis of rotation, wherein said obstruction prevents the inputs from moving to elsewhere within said metering chamber when said metering device is in the second position but does not interfere with the inputs within said input sump when said metering device is in the first position.