Abstract: A high pressure multi-cavity injection molding system has an adjustable overflow cavity on each of the first to fill cavities. The volume of the overflow cavity is remotely adjustable without removing the overflow cavity from the system. In a mold system including a family of molds, the overflow cavities are sized so that the first to fill cavity(ies) and the overflow cavity(ies) fill at substantially the same pressure and time as the last to fill cavity. A looped gate passage is used to automatically sever the molded plastic at an edge of the cavities when the mold is opened. The looped gate passage does not constrict the flow of plastic into the cavities during the molding process.

Abstract: A back support is used by a user in a standing or leaning position and has a back rest that can be adjusted to the proper height and oriented to support the user's low back. The back support has a forward bias so that when the user leans against it, the support means rearward and when the user separates from it the support moves forward to a rest position. The back rest can be used for brief rest periods for workers who are normally in a standing position during an entire shift. The back support can also be used by a worker who can lean against the back rest while working. In an assembly line job, there is often insufficient time for a worker to actually sit down to rest while waiting for another work piece. With the present invention, the worker can rest easily for very brief periods of time.