The press member has an elongate portion (126) with holes (136; 138) in an upper end face (124) and a lower end face (128); these holes are closed during the down stroke and opened during the up stroke.

The mechanism enables motive power to be applied with both the up and down stroke of either or both arms.

The first allows oil to flow from the chamber (19) to the chamber (18) during upward movement of the piston (21) and hence the cam can cause lifting movement of the piston (20) and opening of the valve (11).

The processor varies a down-stroke threshold based on a first factor and varies an up-stroke threshold based on a second factor.

The force transmitting element (2) is adapted for transferring an upstroke and a downstroke to a pump plunger (5) for pumping fluid (12).

The tension unit (3) is adapted for applying a tension force (F) to the force transmitting element (2) for keeping the force transmitting element (2) under tension during the upstroke and the downstroke.

The seal element (10) is adapted for sealingly preventing pumping fluids (12) during the downstroke and for enabling pumping fluid (12) during the upstroke.

She strides towards the dawn of a new day, represented by the rising run.

Stored torque value (424 includes stored torque values from sections of travel (406) of window (104), stored downstroke torque values (428) and stored upstroke torque values (426).

At the final part of its upstroke the piston (26) enters a compression chamber or energy cell (22) which thus decelerates the piston (26) and commences its downstroke.

The impact device can thereby continue the drop hammer's upwardly directed movement after the completion of the cylinder's lifting stroke.

That means that more people will float in the rising ride of prosperity, and fewer will drown.

Reciprocation of the seal, guide and swab piston assembly (102) drives debris and fluid into the debris chamber on the upstroke.

A hook (96) pivotally mounted on the first section (10, 18, 27) engages the second section (36) on a downward stroke of the cylinder (26) and pivots the second section (36) outwardly on an upward stroke.

As the moving vessel (30) reaches the top of its upstroke, the moving vessel (30) releases the gas, thus causing the moving vessel (30) to sink.

An outlet passage connected to the pump chamber permits liquid to flow from the pump chamber to an outlet on each upward and downward stroke.