Apparatus for controlling load handling device

Patent metadata

Field	Value
Publication number	US-2016101970-A1
Application number	US-201514876096-A
Country	US
Kind code	A1
Filing date	Oct 6, 2015
Priority date	Oct 8, 2014
Publication date	Apr 14, 2016
Grant date	—

Abstract

An apparatus for controlling a load handling device of an industrial vehicle is provided. The load handling device includes a mast assembly and a load handling attachment attached to the mast assembly. The apparatus includes a tilt angle detector that detects a tilt angle of the mast assembly, a controller that regulates a lifting speed of the load handling attachment, and a determination device that determines whether or not the load handling attachment is being lifted off the ground. When the determination device determines that the load handling attachment is being lifted off the ground, the controller permits the load handling attachment to be lifted at a speed faster than the regulated lifting speed.

First claim

What is claimed is:

1 . An apparatus for controlling a load handling device of an industrial vehicle, the load handling device having a mast assembly and a load handling attachment attached to the mast assembly, the apparatus that controls tilting operation of the mast assembly and lifting and lowering operation of the load handling attachment, comprising:
a tilt angle detector that detects a tilt angle of the mast assembly; a controller that regulates a lifting speed of the load handling attachment when a forward tilt angle of the mast assembly is greater than a predetermined regulation tilt angle; and a determination device that determines whether or not the load handling attachment is being lifted off the ground, wherein when the determination device determines that the load handling attachment is being lifted off the ground, the controller permits the load handling attachment to be lifted at a speed faster than the regulated lifting speed.

2 . The apparatus for controlling the load handling device according to claim 1 , further comprising a load sensor that detects a load on the load handling attachment, wherein
when a load detected by the load sensor is smaller by a predetermined value or more than a load detected when no load is applied to the load handling attachment, the determination device determines that the load handling attachment is placed on the ground, and the lifting operation of the load handling attachment performed first after the determination device determines that the load handling attachment is placed on the ground is determined by the determination device that the load handling attachment is lifted off the ground.

3 . The apparatus for controlling the load handling device according to claim 2 , wherein
when the load handling attachment that is placed on the ground is lifted off the ground, the controller permits the load handling attachment to be lifted off the ground at a speed that is faster than the regulated lifting speed for a predetermined period of time after a start of the lifting operation of the load handling attachment.

4 . The apparatus for controlling the load handling device according to claim 1 , further comprising a lifted height detector that detects a lifted height of the load handling attachment, wherein
the lifting operation of the load handling attachment performed when the lifted height of the load handling attachment is equal to or lower than a determination lifted height as a reference for determining whether or not the load handling attachment is being lifted off the ground is determined by the determination device that the load handling attachment is lifted off the ground.

5 . The apparatus for controlling the load handling device according to claim 1 , wherein
the controller is connected with an ignition switch for starting and stopping operation of the industrial vehicle, and the lifting operation of the load handling attachment performed first after the ignition switch is turned on is determined by the determination device that the load handling attachment is lifted off the ground.

6 . The apparatus for controlling the load handling device according to claim 1 , wherein
when the forward tilt angle of the mast assembly is greater than the predetermined regulation tilt angle and the load handling attachment is determined as being lifted off the ground, the controller permits the load handling attachment to be lifted at an unregulated lifting speed.

Assignees

• Toyota Jidoshokki Kk

Inventors

• Taki Yasuhiro
• Yamada Tadashi
• Nishiwaki Takashi
• Kuwayama Junichi
• Oka Hidenori
• Hasegawa Kimihide
• Murata Hiroshi

Classifications

• B66F17/003 Primary

  for fork-lift trucks · CPC title

• B66F9/20 Primary

  Means for actuating or controlling masts, platforms, or forks (power take-off from vehicle transmissions, combined with vehicle propulsion systems B60K) · CPC title