US 5,507,057 AGranted

Bridge section shifting drive for a bridge laying apparatus

AssigneeKrupp Fordertechnik GmbH

InventorsWolfgang Diefendahl, Detlef Van Krimpen

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Abstract

A bridge laying apparatus for longitudinally displacing a bridge section includes a pinion shaft; a pinion secured to the pinion shaft for moving with the pinion shaft as a unit; a bearing rotatably and axially slidably supporting the pinion shaft; and a hydraulic power cylinder unit. The power cylinder unit includes a cylinder coaxially surrounding the pinion shaft and defining a cylinder chamber; and a hollow piston axially slidably accommodated in the cylinder chamber and being axially driven by a pressure prevailing in the cylinder chamber. The hollow piston surrounds the pinion shaft. There is further provided a coupling arrangement connecting the hollow piston with the pinion shaft for axially displacing the pinion shaft and the pinion into an axially advanced and into an axially withdrawn position. In the axially advanced position the pinion is situated in a region where it is adapted to mesh with a rack of a bridge section and in the axially withdrawn position the pinion is situated at a clearance from such region.

Claims6

Dependent claims

A bridge laying apparatus for longitudinally displacing a bridge section having a longitudinally extending rack;

the apparatus comprising
(a) a pinion shaft;
(b) a pinion secured to the pinion shaft for moving with said pinion shaft as a unit;
(c) bearing means for rotatably and axially slidably supporting said pinion shaft;
(d) a hydraulic power cylinder unit including
(1) a cylinder coaxially surrounding said pinion shaft and defining a cylinder chamber;
(2) means for pressurizing and depressurizing said cylinder chamber;
and
(3) a hollow piston axially slidably accommodated in said cylinder chamber and being axially driven by a pressure prevailing in said cylinder chamber;
(e) coupling means connecting said hollow piston with said pinion shaft for axially displacing said pinion shaft and said pinion into an axially advanced and into an axially withdrawn position;
in said axially advanced position said pinion is situated in a region where it is adapted to mesh with a rack of a bridge section and in said axially withdrawn position said pinion is situated at a clearance from said region.

8 more elements

Dependencies are inferred from the claim text.