The invention relates to a crank mechanism (1), whereby the crank mechanism (1) comprises a one-piece crankshaft (2) and at least one one-piece connecting rod (3), which may be non-destructively assembled.

The invention further relates to a system module for such a crank mechanism, a production method and a plant for production of the crank mechanism.

The invention relates to a crank mechanism (1), whereby the crank mechanism (1) comprises a one-piece crankshaft (2) and at least one one-piece connecting rod (3), which may be non-destructively assembled.

According to the invention, the form punch and the chase are each mounted in a crank mechanism (31, 32).

The membrane (5) is connected to a crank mechanism (9) by means of a connecting rod (8) or a similar lifting organ.

In order to improve performance and to be able to adjust the device to adapt it to different materials and to permit different welding-bar positions, the device is driven by a reversing crank gear.

The arms (2, 4) of each lever are located on one and the same side of bearings (5) mounted in the body (6), one arm of the lever (4) is kinematically connected to its crank drive (9) whereas the other arm serves as a holder of the die (1).

In electrically powered shears, the movable cutting blade (5) is driven by a crank drive which in turn is driven by a battery-powered electric motor arranged in the housing (2).

The present invention makes available a lightweight crank drive having components made of a lightweight steel which has a reduced density and has an ultra-high carbon content, and the method for manufacturing same.

A diaphragm pump, in particular a microdiaphragm pump, has a crank drive (1) with a connecting rod (2) and an elastic diaphragm (3) joined to the connecting rod (2).

The framework and the tool receiving portion are connected to each other via at least one knee joint rod assembly, said displacement transducer having at least one crank drive that acts on the knee joint rod assembly.