US 3,994,401 AGranted

Crane equipped with dual trolleys

AssigneeHans Tax

InventorsHans Tax, Klaus Hosler

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Abstract

In a crane having two crabs or trolleys on an approximately horizontal beam of the crane, the trolleys are moved along the beam by two cables whose ends are wound on a common, motor-driven drum, and which are trained over pulleys on the beam and on the trolleys in such a manner that both trolleys are moved jointly at one half of the circumferential drum speed or one trolley is moved at the full drum speed when the other trolley is arrested.

Claims6

Dependent claims

In a crane including a beam elongated in a horizontally extending direction and having two longitudinal end portions;

two trolleys mounted on said beam for longitudinal movement;
a first pulley and a second pulley on each trolley;
hoisting means on each trolley for raising and lowering a suspended load;
and drive means for moving said trolleys on said beam, the improvement in the drive means which comprises:
a. cable drum means rotatably secured against movement longitudinally of said beam;
b. drive means for alternatively rotating said drum means in two opposite directions;
c. two elongated tension systems, each system having two flexible terminal portions secured to said drum means and a tension reversing portion movably secured to a respective one of said end portions and longitudinally connecting said terminal portions,
1. said terminal portions of one system being wound onto said drum means and the terminal portions of the other system being unwound from said drum means when said drum means is rotated in one of said two directions,
2. said terminal portions of said other system being wound onto said drum means and the terminal portions of said one system being unwound from said drum means when said drum means is rotated in the other one of said two directions;
d. first guide means guiding each of the two terminal portions of said one system from said drum means to said tension reversing portion of the one system in two strands trained in a loop over a respective one of said first pulleys, said strands extending from the associated first pulley toward the end portion of the beam secured to said tension reversing portion of the first system;
and
e. second guide means guiding each of the two terminal portions of said other system from said drum means to said tension reversing portion of said other system in two strands trained in a loop over a respective one of said second pulleys, said strands extending from the associated second pulley toward the end portion of the beam secured to said tension reversing portion of said other system.

9 more elements

Dependencies are inferred from the claim text.

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Abstract

In a crane including a beam elongated in a horizontally extending direction and having two longitudinal end portions;

two trolleys mounted on said beam for longitudinal movement;
a first pulley and a second pulley on each trolley;
hoisting means on each trolley for raising and lowering a suspended load;
and drive means for moving said trolleys on said beam, the improvement in the drive means which comprises:
a. cable drum means rotatably secured against movement longitudinally of said beam;
b. drive means for alternatively rotating said drum means in two opposite directions;
c. two elongated tension systems, each system having two flexible terminal portions secured to said drum means and a tension reversing portion movably secured to a respective one of said end portions and longitudinally connecting said terminal portions,
1. said terminal portions of one system being wound onto said drum means and the terminal portions of the other system being unwound from said drum means when said drum means is rotated in one of said two directions,
2. said terminal portions of said other system being wound onto said drum means and the terminal portions of said one system being unwound from said drum means when said drum means is rotated in the other one of said two directions;
d. first guide means guiding each of the two terminal portions of said one system from said drum means to said tension reversing portion of the one system in two strands trained in a loop over a respective one of said first pulleys, said strands extending from the associated first pulley toward the end portion of the beam secured to said tension reversing portion of the first system;
and
e. second guide means guiding each of the two terminal portions of said other system from said drum means to said tension reversing portion of said other system in two strands trained in a loop over a respective one of said second pulleys, said strands extending from the associated second pulley toward the end portion of the beam secured to said tension reversing portion of said other system.

9 more elements