Turntable leveling system for a mobile elevating work platform

Patent metadata

Field	Value
Publication number	US-12509339-B2
Application number	US-202117563719-A
Country	US
Kind code	B2
Filing date	Dec 28, 2021
Priority date	Dec 29, 2020
Publication date	Dec 30, 2025
Grant date	Dec 30, 2025

Abstract

A mobile elevating work platform includes a chassis, a slew bearing, a turntable, a lift system, and a turntable leveling system. The turntable leveling system is positioned above the slew bearing and supports the lift system. The turntable leveling system includes a baseplate, a bracket, a first actuator, and a second actuator. The baseplate extends above the slew bearing. The bracket is rotatably coupled to the baseplate and is configured to tilt relative to the baseplate about an axis extending parallel with the baseplate. The first actuator is positioned on a first side of the bracket and the second actuator is positioned on a second side of the bracket.

First claim

What is claimed is:

1 . A mobile elevating work platform, comprising:
a chassis; a slew bearing supported by the chassis; a turntable positioned above the slew bearing and configured to rotate about the slew bearing; a lift system positioned on the turntable and configured to rotate with the turntable relative to the chassis about the slew bearing; and a turntable leveling system positioned above the slew bearing and supporting the lift system, the turntable leveling system comprising:
a baseplate extending above the slew bearing and defining the turntable;
a bracket rotatably coupled to the baseplate and configured to tilt relative to the baseplate about an axis extending parallel with the baseplate;
a first actuator and a second actuator, the first actuator positioned on a first side of the bracket and the second actuator positioned on a second side of the bracket;
wherein extension of the first actuator and retraction of the second actuator causes the bracket to rotate about the axis in a first direction; and
wherein retraction of the first actuator and extension of the second actuator causes the bracket to rotate about the axis in a second direction opposite the first direction.

2 . The mobile elevating work platform of claim 1 , wherein the lift system includes an articulating boom, and wherein a lower lift arm of the articulating boom is rotatably coupled to the bracket.

3 . The mobile elevating work platform of claim 2 , wherein a lift actuator is coupled to the bracket and is configured to rotate the lower lift arm about a second axis perpendicular to the axis.

4 . The mobile elevating work platform of claim 1 , wherein the first actuator and the second actuator are configured to adjust an orientation of the bracket relative to the baseplate and are further configured to adjust a height of the lift system.

5 . The mobile elevating work platform of claim 4 , wherein each of the first actuator and the second actuator include a lift cylinder and a tilt cylinder, wherein the tilt cylinder is configured to adjust the orientation of the bracket relative to the baseplate and the lift cylinder is configured to adjust the height of the lift system.

6 . The mobile elevating work platform of claim 4 , wherein the first actuator and the second actuator are coupled to the baseplate at a first end and coupled to a lower lift arm of the lift system at a second end.

7 . The mobile elevating work platform of claim 6 , wherein the lower lift arm includes laterally and rearwardly extending wings that define eyelets that receive the second ends of the first actuator and the second actuator.

8 . The mobile elevating work platform of claim 1 , wherein the lift system includes a platform assembly configured to be raised away from the chassis.

9 . The mobile elevating work platform of claim 1 , wherein the bracket is supported by lugs extending upwardly away from the baseplate, the lugs supporting a pivot pin about which the bracket is configured to rotate.

10 . A mobile elevating work platform, comprising:
a chassis; a slew bearing supported by the chassis; a turntable positioned above the slew bearing and configured to rotate about the slew bearing; a lift system positioned on the turntable and configured to rotate with the turntable relative to the chassis about the slew bearing; and a turntable leveling system positioned above the slew bearing and supporting the lift system, the turntable leveling system comprising:
a bracket defining an array of pivot points;
a baseplate coupled to the bracket and configured to rotate about an axis defined by at least one of the array of pivot points;
a first actuator and a second actuator, the first actuator positioned on a first side of the bracket and coupled to one of the array of pivot points and the second actuator positioned on a second side of the bracket and coupled to one of the array of pivot points;
wherein extension of the first actuator and retraction of the second actuator causes the baseplate to rotate about the axis in a first direction; and
wherein retraction of the first actuator and extension of the second actuator causes the baseplate to rotate about the axis in a second direction opposite the first direction.

11 . The mobile elevating work platform of claim 10 , wherein the lift system includes an articulating boom, and wherein a lower lift arm of the articulating boom is rotatably coupled to the baseplate.

12 . The mobile elevating work platform of claim 10 , wherein the first actuator and the second actuator angle outwardly away from the bracket at an angle of between 45 degrees and 160 degrees.

13 . The mobile elevating work platform of claim 10 , wherein the bracket has a generally triangular shape, and wherein the array of pivot points are positioned adjacent vertices of the generally triangular shape.

14 . The mobile elevating work platform of claim 13 , wherein the baseplate is coupled to the bracket adjacent an uppermost vertex of the bracket.

15 . The mobile elevating work platform of claim 10 , wherein the bracket is positioned between the baseplate and the slew bearing.

16 . The mobile elevating work platform of claim 15 , wherein flanges are formed on the baseplate, and wherein the each of the first actuator and the second actuator are coupled to one of the flanges.

17 . A mobile elevating work platform, comprising:
a chassis; a slew bearing supported by the chassis; a turntable positioned above the slew bearing and configured to rotate about the slew bearing; a lift system positioned on the turntable and configured to rotate with the turntable relative to the chassis about the slew bearing; and a turntable leveling system positioned above the slew bearing and supporting the lift system, the turntable leveling system comprising:
a baseplate extending above the slew bearing and defining the turntable;
a bracket rotatably coupled to the baseplate and configured to tilt relative to the baseplate about an axis extending parallel with the baseplate;
a first actuator and a second actuator, the first actuator positioned on a first side of the bracket and the second actuator positioned on a second side of the bracket, wherein the first actuator is coupled to a first side of a lower lift arm of the lift system and the second actuator is coupled to a second side of the lower lift arm of the lift system;
wherein extension of the first actuator and retraction of the second actuator causes the bracket to rotate about the axis in a first direction; and
wherein retraction of the first actuator and extension of the second actuator causes the bracket to rotate about the axis in a second direction opposite the first direction.

18 . The mobile elevating work platform of claim 17 , wherein extending of the first actuator and extension of the second actuator causes the lower lift arm of the lift system to rotate upwardly away from the bracket.

19 . The mobile elevating work platform of claim 18 , wherein retracting of the first actuator and retraction of the second actuator causes the lower lift arm of the lift system to rotate downwardly toward the bracket.

20 . The mobile elevating work platform of claim 17 , wherein each of the first actuator and the second actuator are two-stage actuators.

Assignees

• Oshkosh Corp

Inventors

• Miller Wenton S
• Hackenberg Eric

Classifications

• B66F9/07559

  Stabilizing means · CPC title

• B66F11/044 Primary

  Working platforms suspended from booms · CPC title