Scissor deck access arrangement

Patent metadata

Field	Value
Publication number	US-10829355-B2
Application number	US-201916459295-A
Country	US
Kind code	B2
Filing date	Jul 1, 2019
Priority date	Oct 20, 2017
Publication date	Nov 10, 2020
Grant date	Nov 10, 2020

Abstract

A lift device includes a chassis, a platform disposed above the chassis, a lift assembly coupling the platform to the chassis and configured to move the platform between a lowered position and a raised position, and a stair assembly coupled to at least one of the platform and the chassis, the stair assembly including a first step and a second step. The platform includes a deck defining a top surface configured to support an operator. The stair assembly is selectively repositionable relative to the chassis between a stored position and a deployed position. The stair assembly facilitates access to the deck from the ground when in the deployed position.

First claim

What is claimed is:

1. A lift device, comprising:
a chassis;
a platform disposed above the chassis, the platform including a deck defining a top surface configured to support an operator;
a lift assembly coupling the platform to the chassis and configured to move the platform between a lowered position and a raised position;
a stair assembly coupled to at least one of the platform and the chassis, the stair assembly including a first step and a second step; and
a ladder assembly including a third step fixed relative to the chassis and a fourth step fixedly coupled to the stair assembly,
wherein the stair assembly is selectively repositionable relative to the chassis between a stored position and a deployed position, and wherein the stair assembly facilitates access to the deck from the ground when in the deployed position; and
wherein the ladder assembly facilitates access to the deck from the ground when the stair assembly is in the stored position, wherein the fourth step at least partially extends directly above the third step when the stair assembly is in the stored position, and wherein the fourth step is configured to move away from the third step when the stair assembly is moved to the deployed position.

2. The lift device of claim 1 , wherein the stair assembly is pivotally coupled to the chassis, and wherein the stair assembly is selectively rotatable relative to the chassis about a substantially vertical axis between the stored position and the deployed position.

3. The lift device of claim 2 , wherein the first step is a bottommost step of the stair assembly, and wherein the first step at least partially extends directly beneath the deck when the stair assembly is in the stored position.

4. The lift device of claim 2 , further comprising a plurality of tractive elements coupled to the chassis and configured to drive the lift device in a longitudinal direction, wherein the deck is longer in the longitudinal direction than in a lateral direction oriented perpendicular to the longitudinal direction, and wherein the stair assembly is disposed along a side of the chassis that extends parallel to the longitudinal direction.

5. The lift device of claim 1 , wherein the ladder assembly further comprises a fifth step fixed relative to the chassis, wherein the third step extends a first distance outward horizontally relative to the chassis, wherein the fifth step extends a second distance outward horizontally relative to the chassis, and wherein the first distance is equal to the second distance.

6. The lift device of claim 1 , wherein, when the stair assembly is in the deployed position, the third step is disposed between the stair assembly and the chassis such that the stair assembly obstructs access to the ladder assembly.

7. The lift device of claim 1 , wherein the stair assembly further includes a first railing and a second railing, wherein the first railing and the second railing extend along opposite sides of the first step and the second step, and wherein the first railing and the second railing extend above the first step and the second step when the stair assembly is in the deployed position.

8. The lift device of claim 7 , wherein the first railing and the second railing are fixed relative to the first step and the second step, wherein the first railing extends above the top surface of the deck, and wherein the second railing at least partially extends directly beneath the deck when the stair assembly is in the stored position.

9. The lift device of claim 1 , further comprising:
a plurality of tractive elements rotatably coupled to the chassis and configured to drive the lift device;
a sensor configured to provide sensing signals relating to the position of the stair assembly; and
a controller operatively coupled to the sensor, wherein the controller is configured to limit movement of at least one of the tractive elements in response to determining, based on the sensing signals, that the stair assembly is not in the stored position.

10. The lift device of claim 1 , further comprising:
a first operator interface coupled to the platform;
a second operator interface coupled to the chassis; and
an actuator configured to move the stair assembly between the stored position and the deployed position in response to at least one of the first operator interface and the second operator interface receiving a command.

11. The lift device of claim 1 , wherein the lift assembly is a scissor assembly configured to move the platform in a substantially vertical direction.

12. A lift device, comprising:
a frame assembly;
a platform disposed directly above the frame assembly, the platform including a deck defining a top surface configured to support an operator;
a scissor assembly coupling the platform to the frame assembly and configured to move the platform between a lowered position and a raised position; and
a stair assembly coupled to at least one of the platform and the frame assembly, the stair assembly including a first support and a second support extending substantially parallel to one another; and
a ladder assembly including a third support fixed relative to the frame assembly and a fourth support fixedly coupled to the stair assembly,
wherein the stair assembly is selectively repositionable relative to the frame assembly between a stored position and a deployed position, and wherein the stair assembly facilitates access to the deck from the ground when in the deployed position; and
wherein the fourth support at least partially extends directly above the third support when the stair assembly is in the stored position, and wherein the fourth support is configured to move away from the third support when the stair assembly is moved to the deployed position.

13. The lift device of claim 12 , wherein, when the stair assembly is in the stored position, the first support extends a first distance outward horizontally relative to the frame assembly and the second support extends a second distance outward horizontally relative to the frame assembly, wherein the first distance is equal to the second distance, and wherein the stair assembly facilitates access to the deck from the ground when in the stored position.

14. The lift device of claim 12 , further comprising:
a plurality of tractive elements rotatably coupled to the frame assembly and configured to drive the lift device;
a sensor configured to provide sensing signals relating to the position of the stair assembly; and
a controller operatively coupled to the sensor, wherein the controller is configured to limit movement of at least one of the tractive elements in response to determining, based on the sensing signals, that the stair assembly is not in the stored position.

Assignees

• Oshkosh Corp

Inventors

• Puszkiewicz Ignacy
• Foster Zachary C
• Hummer Evan J

Classifications

• B66F11/042 Primary

  actuated by lazy-tongs mechanisms or articulated levers · CPC title

• B66F13/00 Primary

  Common constructional features or accessories · CPC title