Abstract: A closed injection mold for molding liquid resins into molded plastic articles containing at least one vent apparatus having a reciprocating vent pin operative to retract to open the vent opening and extend to close the vent opening. Each vent apparatus is responsive to a full resin level in the mold cavity to close the vent opening. When the vent opening is closed, cleansing fluid is automatically circulated through the debris charge line of the vent apparatus to clear the venting channels prior to the resin debris hardening.

Abstract: A closed injection mold for molding liquid resins into molded plastic articles containing at least one vent apparatus having a reciprocating vent pin operative to retract to open the vent opening and extend to close the vent opening. Each vent apparatus is responsive to a full resin level in the mold cavity to close the vent opening. When the vent opening is closed, cleansing fluid is automatically circulated through the debris charge line of the vent apparatus to clear the venting channels prior to the resin debris hardening.

Abstract: A resin transfer molding apparatus includes a single-shot metering pump which feeds a predetermined amount of resin material to the mold with a single stroke of the pump via an injector assembly which is mounted on the mold. A closed-loop hydraulic control of the metering pump enables the injection rate and pressure of the resin to be varied during the injection cycle to produce a more consistent fill of the mold and eliminate part waviness caused by pressure rise and fall. The mold-mounted injector assembly and placement of a plurality of valves in the apparatus enables recirculation of unused resin material back to the supply tank at a temperature sufficiently cool to prevent curing, so that solvent flushing of the apparatus can be eliminated in most cases. The apparatus is automatically controlled by a computer resulting in an integrated automatic apparatus.

Abstract: A belt pulley and method of making the same are provided, the pulley having a hub and a peripheral groove for receiving part of an endless belt therein that is to drive the pulley or be driven thereby whereby the pulley is adapted to be rotated about the axis of the hub. The groove of the pulley defines an annular bottom surface of the groove and a pair of spaced apart angled inside surfaces of the groove that join with the bottom surface and diverge away from each other as the angled surfaces extend away from the bottom surface. The angled surfaces are adapted to be engaged by opposed angled sides of the belt in such a manner that a bottom of the belt will be spaced from the bottom surface. The pulley has opposed outer sides.

Abstract: A covered V-belt having reduced coefficient of friction sides and a method for making the same are provided. The outer cover of the belt of this invention comprises a metallic material incorporated with the elastomeric material of the cover, which material is so incorporated either by depositing a thin film of the material onto a finished belt or by mixing a finely divided metallic material into the elastomer.

Abstract: A covered V-belt having reduced coefficient of friction sides and a method for making the same are provided. The outer cover of the belt of this invention comprises a metallic material incorporated with the elastomeric material of the cover, which material is so incorporated either by depositing a thin film of the material onto a finished belt or by mixing a finely divided metallic material into the elastomer.

Abstract: A covered V-belt having reduced coefficient of friction sides and a method for making the same are provided. The outer cover of the belt of this invention comprises a metallic material incorporated with the elastomeric material of the cover, which material is so incorporated either by depositing a thin film of the material onto a finished belt or by mixing a finely divided metallic material into the elastomer.