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US 4,318,346 AGranted
Biased traveling crane drive
OwnerCharles E. Sessuminventor
Life of this patent
Estimating the term…
Abstract
An overhead suspension load transporting trolley which is suspended from a track, such as the flange of an I beam, which has a drive wheel suspended below a carriage, which wheel is biased against the I beam by a counterweight on the opposite end of a lever from the drive wheel.
Claims4
A bridge crane for mounting onto two substantially parallel I-beams comprising two trolleys each comprising:
- a carriage mounted on wheels adapted to ride on a respective I-beam,
- a suspension frame extending from each said carriage and below each said carriage having
- a lever pivotally mounted to each said suspension frame and having a drive wheel mounted to each said lever toward one end thereof and a counterweight mounted toward the opposite end thereof, said counterweight tending to urge said drive wheel toward said carriage at a constant force to provide the only force causing each said drive wheel to engage each said I-beam,
- a connecting frame connecting said trolleys and
- a drive means mounted to said connecting frame and operably connected to each drive wheel.
2 more elements
Dependencies are inferred from the claim text.