Abstract: An automatic bag filling machine employs a reduced pressure or a vacuum within a bag enclosing shroud to draw powdered material into either valved bags or vapor barrier bags in a series of increments to fill the bags with a relatively compacted powder. The shroud has movable liner assembly for adjustably enclosing bags of various size. A novel filling spout and a vapor barrier spout carrier by the shroud each have an expandable boot member to seal the mouth of the bag on the spout to preclude seepage of powdered material from the bag interior during filling. A filter tank connected to the machine reduces the discharge of powdered material into the surrounding atmosphere, and allows waste material to be reclaimed. Valves for controlling vacuum imparted to the shroud chamber, venting the bag interior, powdered material flow, and relief to atmospheric pressure of the shroud interior, are operated in proper sequence to fill the bag.

Abstract: A pivoted operator d(4) for an electric switch has an inwardly extending actuating leg (4d) having direct connection with a contactor (12) to provide over-center pivoting and sliding motion for the contactor. The inner end of the actuating leg has a first slot (4f) wherein the actuator leg straddles the contactor and has grooved (4h) interior surfaces which receive outward lateral projections (12a) on the contactor for affecting a driving connection therebetween. The depending leg has a cylindrical recess (4e) which receives a helical compression spring (14) to bear between the operator and the contactor. Transversely aligned connection points (12a, 4h) actuator and contactor and the edges of the slot (4f) in the actuator cooperating with the lateral edges of the contactor (12) guide the latter throughout its longitudinal movement to prevent angular displacement in a horizontal plane of the contactor within the switch.