US 2023/0399216 A1Published application

Scissor lift descent control systems and methods

AssigneeOshkosh Corporation

InventorsLouis BAFILE, Eko PRASETIAWAN

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Abstract

A lift vehicle comprises a base, a battery arranged within the base, a drive motor powered by the battery and configured to drive a wheel, a scissor lift including a first end coupled to the base and being movable between an extended position and a retracted position, a work platform supported by a second end of the retractable lift, and a linear actuator having a lift motor. The lift motor is powered by the battery, and the linear actuator is coupled to the retractable lift so that rotation of the rotor moves the retractable lift between the extended position and the retracted position. The lift vehicle further includes an electromagnetic brake and a centrifugal brake coupled to the lift motor.

Claims20

Dependent claims

A lift vehicle comprising:

a base;
a battery arranged within the base;
a drive motor powered by the battery and configured to drive a wheel;
a scissor lift including a first end coupled to the base, the scissor lift being movable between an extended position and a retracted position;
a work platform supported by a second end of the scissor lift;
a linear actuator including a lift motor powered by the battery, and the linear actuator being coupled to the scissor lift so that rotation of the lift motor moves the scissor lift between the extended position and the retracted position;
a centrifugal brake coupled to the lift motor;
and
an electromagnetic brake coupled to the lift motor, the electromagnetic brake including:
a friction disk rotationally fixed to the lift motor for rotation therewith;
an armature;
and
a wire coil configured to selectively receive power from the battery and, in response, produce an electromagnetic force on the armature to displace the armature out of engagement with the friction disk, and in the event of a power failure, the wire coil is de-energized and the armature is configured to be biased into engagement with the friction disk to prevent rotation of the lift motor and, thereby, prevent the scissor lift from moving between the extended position and the retracted position.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/239,026Filed 28 Aug 2023
Priority: 5 Apr 2019
Published: 14 Dec 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification16 codes

B66F 17/006
Safety devices, e.g. for limiting or indicating lifting force: for working platforms
B66F 7/0625
With platforms supported by levers for vertical movement: with wheels for moving around the floor
B66F 7/0666
Scissor linkages, i.e. X-configuration: multiple scissor linkages vertically arranged
B66F 11/04
Lifting devices specially adapted for particular uses not otherwise provided for: for movable platforms or cabins, e.g. on vehicles, permitting…

Family

Application62/830,164Us provisional application · filed 5 Apr 2019
Application16/811,851Continuation · filed 6 Mar 2020
Application17/863,863Continuation · filed 13 Jul 2022
Application18/239,026Continuation
US 11,787,679 B2Related patent
US 11,945,704 B2Related patent
US 12,371,312 B2Related patent
US 2020/0317494 A1Published application
US 2022/0348449 A1Published application
US 2023/0399216 A1This patent

From the US filing history. Foreign family members aren’t listed.

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