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US 6,779,634 B1Granted
Dumb waiter elevating and lowering platform device
OwnerWayne M. Slagleinventor
Life of this patent
Estimating the term…
Abstract
An elevating system is provided that includes a platform that may travel up and down a tower through the use of a pair of cables, pulleys mounted at the top of the tower and a low profile motor mounted near the bottom of the tower to selectively raise and lower the platform by winding and unwinding of the cables.
Claims10
A dumbwaiter comprising:
- a tower assembly defining a vertical track;
- a container for receiving and delivering materials, the container slidably coupled to the track for vertical movement of the container between vertically spaced apart positions;
- a pair of upper sheaves mounted at the top of the tower assembly, wherein the upper sheaves are rotatably coupled to a sheave mount, the sheave mount pivotally mounted at the top of the tower assembly to thereby respond to a change in length of either cable by pivoting to retain a balanced load on each cable;
- a pair of lower sheaves mounted at the bottom of the tower assembly;
- and
- a pair of lifting cables each having a first end mounted to the container and extended there from over one of the upper sheaves and extended there from to one of the lower sheaves, a second end of each cable attached to and wound onto the corresponding one of the lower sheaves, the lower sheaves fixedly mounted to a rotatable cylindrical shaft, the cylindrical shaft encasing a drive motor and engaged by the drive motor for selective rotation of the shaft and accordingly the lower sheaves to thereby wind and unwind the lifting cables to selectively raise and lower the container.
3 more elements
A dumbwaiter for raising and lowering a platform, comprising:
- a cylindrical shaft encasing a drive motor and engaged by the drive motor for selective rotation of the shaft, the drive motor comprising an asynchronous motor, an electromagnetic disk brake, a planetary gear mechanism and a limit switch;
- a tower assembly having a tower upper end, a tower lower end, a left side and a right side, the cylindrical shaft being adjacent the tower lower end;
- two spaced-apart sheaves coupled to the cylindrical shaft each of the sheaves in substantially vertical alignment with the left side and the right side;
- a pair of cables each having a first end and a second end, each first end coupled to one of the two sheaves;
- a pulley system pivotally mounted above the tower upper end to thereby respond to a change in length of either cable by pivoting to retain a balanced load on each cable, the pulley system having two spaced-apart pulleys in substantial vertical alignment with the two spaced-apart sheaves, each cable routed through one of the two pulleys;
- a platform connection slidably received on the tower, both cable second ends coupled to the platform connection;
- and
- a container coupled to the platform connection, the outer shaft case adapted to rotate in a first direction to unwind the two cables from their corresponding sheaves causing the platform connection to be lowered, and a second direction to wind the two cables onto their corresponding sheaves causing the platform connection to be raised.
5 more elements
Dependencies are inferred from the claim text.