Abstract: In a Hand-Held Extruder for polymeric materials such as elastomeric sealant compositions, an extruding barrel has, a material flow passage with an inlet for introducing the sealant material to be extruded into the material flow passage and a discharge outlet for discharging the sealant material, a thermostatically controlled heating mechanism for adjustably controlling the heat of the extruding barrel to maintain the material being extruded in plastic condition, and a screw type conveyor rotatably mounted in the extruder barrel for moving the plastic sealant material from the inlet to the discharge outlet of the material flow passage, the screw conveyor is driven by any suitable power source coupled to a double planetary gear reduction transmission assembly so as to provide a counterclockwise rotation of the screw conveyor without reduction in torque to increase the troughput and discharge of material from the material flow passage.

Abstract: A metering pump including a pump body having a bore for receiving a flowable composition to be dispensed, feed inlet means communicating with the bore, and spaced outlet means including a check valve, for discharging the composition. A pressure chamber is defined intermediate the pump inlet and outlet. The chamber has an inlet, and an outlet communicating with the pump outlet through the check valve. A piston is mounted for axial reciprocation in the bore between a first position at which the piston is withdrawn from the pressure chamber inlet, and a second position at which the piston passes at least partially into such inlet. The pressure chamber inlet is bounded by sealing means including an annular sealing surface which converges in the direction of the pressure chamber, to a diameter less than that of the piston, whereby the surface may slideingly engage and seal with the piston upon the latter entering the pressure chamber.