Abstract: A trouble light unit molded of plastic. One end of its tubular handle defines a receptable receiving a spacer block to which is slip-fit a lamp socket and switch device received and frictionally clamped in their required position as a diametral split in the outer end portion of the receptacle wall structure accommodates laterally projected portions of the included switch.A sleeve-like insert applied in receptacle and portion of the handle forms substantially dead air space within its interior wall surface which insulates the body of the inserted lamp socket.A preferred lamp or bulb cage for use with the handle which permits soft light to pass and provides vents including air flow facilitating the escape of heat.The handle also incorporates plate-like projections which shield the switch operator and preclude direct impact thereof.

Abstract: A plastic injection machine injects at an initial higher pressure, with the opening of the injection nozzle valve being delayed to allow injection pressure to build up. When the mold is filled, the pressure applied by the machine is shifted to a low holding pressure which is maintained until the plastic beings to set up. A shouldered bronze thrust bearing transmits the high pressure from the hydraulic injection cylinders to the injection machine screw.