Abstract: A hand-portable suitcase unit formed by a drawer and a slip-case cover, with a retaining lock which retains the drawer within the cover so that the unit may be carried as luggage by a combination carrying handle and drawer pull attached to the drawer front. Interlocking bead members are provided on the upper and lower surfaces of the slip-cases so that they may be stacked with the drawers horizontal to form a chest-of-drawers, and a cooperating latching device is shown on the rear face of the slip-case for releasably locking the covers together in the stack.

Abstract: A walking beam pumping unit is provided for pumping liquid from wells having gas pressure therein. The unit is driven by gas pressure from the well reciprocating the piston of a pneumatic cylinder up and down to swing the walking beam correspondingly and pump the liquid from the well. Gas under pressure is directed from the wellhead through a two-way valve to the opposite ends of the hydraulic cylinder in alternating fashion, so the piston has power strokes in opposite directions. Each power stroke, besides moving the walking beam, serves to recompress the gas used for the preceding power stroke sufficiently to inject it into the sales line. The setting of the two-way valve is controlled by a pneumatic actuator supplied with gas under pressure from the wellhead and having a thimble valve responsive to the up and down movement of the walking beam by means of adjustable stops carried thereon.

Abstract: A selecting machine of the type commonly used for addressing mailed material from individual data-bearing cards, using tri-level logical comparator circuitry to compare the individual cards against an interchangeable master card. Both the individual and the master cards are perforated in files of holes longitudinal to the direction in which they are synchronously moved by the machine, the files of perforations being sensed by phototransistors connected in turn to the logic circuitry. For each potentially perforable site on the individual card, there are two corresponding locations on the master card, one of which when matched by a perforation on the individual card indicates nominal selection of the individual card, the other of which indicates positive rejection of the individual card, overriding any nominal selection, with rejection by default occurring if neither location on the master is perforated to correspond with a perforation at the equivalent site on the individual card.

Abstract: A convertible electrical plug is disclosed in which one of the prongs is a retractable grounding prong. A channel is provided in the plug body to receive the grounding prong. The channel in the plug body is generally parallel to the prongs and extends through the flat front end of the plug body through which the prongs pass. The channel in the plug body also extends through the rear surface of the plug body remote from the flat front end. A conductive metallic channel member is disposed in the channel in the plug body and the grounding prong is disposed within the conductive metallic channel member. The conductive metallic channel member is connected to the ground wire of a three-wire electrical cord in the preferred embodiment. The grounding prong and the conductive channel member are retained in the channel in the plug body by means of a pivot pin which passes through the plug body.

Abstract: A timelock for bank vault doors and the like is disclosed. The disclosed timelock includes three electronic interval timing devices, each interval timing device including a bank of thumbwheel switches on which the desired minimum interval from the arming of the timelock to the reopening of the bank vault door or the like is retained from day to day unless manually changed. All three of the electronic interval timing devices are started by a switch operated by the timelock arming lever. Each electronic interval timing device includes a numerical display device on which the preset delay interval retained in its bank of thumbwheel switches is displayed. Each electronic interval timing device also includes a numerical display on which the unexpired delay duration is displayed in numerical form whenever that interval timing device is operating. Each electronic interval timing device also includes an output solenoid and means for energizing the output solenoid for a predetermined period (e.g.