Patent ID: 8220362
Filing Date: 2012-07-17
Classification: B29C,Y10T

Abstract:
1. A cam apparatus for a valve stem actuator, the cam apparatus comprising: a plurality of cam bars, movably mounted on a plurality of bearing rails, the plurality of cam bars having a plurality of profiled cam slots; a plurality of cam followers joined to an actuation plate of a hot runner having a plurality of valve stems mounted on the actuation plate, the plurality of valve stems are simultaneously translated through a gate open position, a gate closed positioned, and a service position, via travel of the plurality of cam followers, attached to the actuation plate, in the plurality of profiled cam slots; and a locking pin for removal of the actuation plate and the plurality of valve stems for servicing, the locking pin inserted through a frame assembly of the hot runner and into the plurality of cam bars, the locking pin to ensure position of the plurality of valve stems is maintained upon re-installation of the actuation plate, to ensure accuracy of alignment of each valve stem to a respective gate orifice, whereby the plurality of cam followers and the actuation plate configured to be removed through a plurality of exit slots from the plurality of cam bars which have openings on their clamp face, so that the actuation plate and the plurality of valve stems is free of the hot runner for ease of maintenance.