Abstract: A drive means for a photographic film developing tank and a developing tank for use therewith, including magnetic coupling means connecting an agitator in the tank with the reciprocating-type drive means, such as a rack and pinion, and an electric motor.

Abstract: An adapter device for securement to an output rotary drive of a drill. The adapter comprises a housing having an input connector securable to the rotary drive, and an output connector. A fixed mode cam is immovably secured with respect to the housing. A displaceable floating cam is provided intermediate the input connector and a displaceable keying element. The floating cam is displaceable in and out of engagement with the input keying element. An adjusting assembly is provided to displace the keying element in and out of engagement with the fixed mode cam and the floating cam whereby the input connector can impart a rotary drive, rotary drive and impact forces or impact forces only to the output connector.

Abstract: A fluid operated stepping motor comprising a cylinder housing having one or more fluid cylinders to alternately displace at least two cam engaging members when pressure from a pressure source is applied to one of the cylinders. The cam engaging members are diametrically opposed. A cam is secured relative to the cylinder housing and having a plurality of teeth asymmetrically disposed thereon, is also provided. Each tooth has a power profile surface and an idle profile surface. The power profile surface is slidingly engageable by one of the cam engaging members when pressure is applied to displace the said one cam engaging member axially whereby the power profile surface will cause relative rotational displacement between the cylinder housing and the cam.