A power and free conveying system includes a track assembly having a power track and a free track spaced vertically from the power track, a power trolley supported on the power track for movement therealong and a free trolley supported on the free track for movement therealong. The free trolley includes a moveable holdback dog engageable and disengageable with the power trolley. The free trolley includes a retractable dog having a first position engageable with the power trolley and a second pos...

A two-track conveyor system includes an I-beam-shaped power track and a channel-shaped free track, where the power track supports a heavy-duty chain drive having a pusher dog with a pivotal connector. By providing the pusher dog with the pivotal connector the pusher dog can be used with a load-bearing trolley, that rides within the free track, that has a fixed power dog at the front end of the leading trolley and that does not require a hold back dog.

A device for removing conveyor carriages from a conveyor-path region of an overhead conveyor in the event of an alarm, particularly in the region of a fire door. The overhead conveyor has a plurality of conveyor carriages received on a travel rail, a drivable pull line driven by a main drive for the conveyor carriages, and a plurality of drivers connected to the pull line, on each of which displaceable stop pawls are arranged. Within the conveyor-path region that is to remain clear, there is arr...

A system for moving a tele-operated car containing electrical equipment is disclosed herein which comprises a drive mechanism, a trolley chain continuously driven by the drive mechanism, a railway disposed along the trolley chain, a tele-operated car with a sprocket wheel engaging the trolley chain and a rail wheel engaging the railway, and a generator in the car for supplying electric power to the electrical equipment. The generator is selectively driven by the sprocket wheel when the car is st...

A power and free conveying system includes a track assembly having a power track and a free track spaced vertically from the power track, a power trolley supported on the power track for movement therealong and a free trolley supported on the free track for movement therealong. The free trolley includes a moveable holdback dog engageable and disengageable with the power trolley. The free trolley includes a retractable dog having a first position engageable with the power trolley and a second pos...

This invention relates to a method of, and apparatus for defouling the hull of a ship while afloat by lowering into the water a pad having a liquid, permeable dispensing face, moving the pad to bring the dispensing face into intimate contact with the hull, and feeding to the pad steam or a poisonous liquid composition which passes through the dispensing face to attack the adjacent marine growth.

A plurality of two-input logic gates such as OR gates supplying their outputs to a three-input logic gate such as an AND gate and including a feedback connection from the three-input gate to all but one of the two-input gates. A control signal is applied to the two-input gate not receiving feedback and the complement of this control signal is applied to one of the other two-input gates. An information signal is applied to the two-input gate not receiving feedback and to a two-input gate not rece...

In a power-and-free trolley conveyor, a carrier is transferred from a first power line to a second power line separated therefrom by being pushed forward from behind with a following pusher dog on the first power line.

In an overhead-rail materials-conveyance system including an endless drive chain juxtaposed to an endless rail for driving hanger-type carriers suspended therefrom by means of wheels, a coupling assembly for carrier entrainment comprises a plurality of jaws pivotably mounted on the drive chain for swinging about respective axes parallel to the transport direction. The jaws are each provided with beveled edges for cammingly engaging coupling and uncoupling heads projecting vertically from front a...

A device for an overhead conveyor system of the type where a plurality of carriages (7) by contracting a rotating drive shaft (5) are propellable along a rail (2). The device comprises an operating arm (28) arranged in connection with a first carriage (7b) and adapted to actuate, by turning about an axis of rotation (26), a power transmission element (24) to disconnect the carriage from contact with the drive shaft, and an angled supporting surface (20) arranged in connection with a second carri...