Automatic stopping device for forklift

Patent metadata

Field	Value
Publication number	US-9994200-B2
Application number	US-201314650736-A
Country	US
Kind code	B2
Filing date	Oct 14, 2013
Priority date	Dec 10, 2012
Publication date	Jun 12, 2018
Grant date	Jun 12, 2018

Abstract

An exemplary embodiment of the present disclosure relates to an automatic stopping device for a forklift, and more particularly, to an automatic stopping device for a forklift, which forcibly stops the forklift by simultaneously operating a forward clutch and a reverse clutch when an operator moves away from the forklift in a state in which an engine is turned on. According to the automatic stopping device for a forklift according to the exemplary embodiment of the present disclosure, first, it is possible to prevent a safety accident by forcibly stopping the forklift in the absence of the operator, and second, the automatic stopping device for a forklift is economical because it is possible to effectively stop the forklift using an additional simple configuration.

First claim

What is claimed is:

1. An automatic stopping device for a forklift, comprising:
a forward/reverse lever of the forklift which is manipulated by an operator;
a forward actuation valve and a reverse actuation valve which are operated by the forward/reverse lever;
a transmission which is provided between an engine and drive wheels and performs a gear shift operation by an operation of the forward actuation valve or the reverse actuation valve; and
a stopping unit which forcibly stops the forklift depending on whether the operator is present,
wherein the stopping unit includes:
a seated operator detector which detects whether the operator is seated in an operator's seat;
a brake pedal detector which detects whether a brake pedal is operated; and
a controller which obtains signals from the seated operator detector and the brake pedal detector and controls the forward actuation valve and the reverse actuation valve; and
wherein, when the controller obtains the signal regarding an absence of the operator from the seated operator detector, the controller operates the forward actuation valve and the reverse actuation valve after a first standby time, and
wherein, when the controller obtains information indicating that the operator is seated in the operator's seat from the seated operator detector, and obtains a signal for operating the brake pedal received from the brake pedal detector after a second standby time, the controller stops the forward actuation valve and the reverse actuation valve.

2. The automatic stopping device of claim 1 , wherein the seated operator detector is provided as a pressure sensor mounted in the operator's seat.

3. The automatic stopping device of claim 1 , wherein the controller compares the signals received from the seated operator detector and the brake pedal detector with respective predetermined values, and operates the forward actuation valve and the reverse actuation valve of the transmission depending on compared information.

4. The automatic stopping device of claim 1 , wherein the brake pedal detector detects an electrical contact of the brake pedal or detects an operating angle of the brake pedal.

5. The automatic stopping device of claim 1 , wherein when the brake pedal detector detects the brake pedal is operated, all signals transmitted from the controller to the forward actuation valve and the reverse actuation valve are released.

Assignees

• Doosan Corp

Inventors

• Choi Ui Gon

Classifications

• B66F9/07504

  Accessories, e.g. for towing, charging, locking · CPC title

• B66F9/07509 Primary

  Braking · CPC title

• B60T7/042 Primary

  by electrical means, e.g. using travel or force sensors · CPC title

• B60T7/14

  operated upon collapse of driver (deadman's devices for electrically propelled vehicles B60L3/02) · CPC title

• B60T13/662

  characterised by specified functions of the control system components · CPC title