Crown Equipment Corporation

Brent A Bergman

Robert J Henshaw

Michael P Gallagher

Steven R Pulskamp

Philip D Palermo

Craig J Rekow

Russell J Kroll

Adam M Ruppert

Douglas J Rinderle

Kevin Anthony Gilliland

Leroy M Kluver

Todd M Fullenkamp

Donald E Luebrecht

Eric J Kaiser

Steven C Billger

Allen Thomas Trego

Michael W Henderson

Edward E Ahigian

Controller for a materials handling vehicle

Materials handling controller

Control arm for a materials handling vehicle

Control arm for a materials handling vehicle including a tiller

A handle mounted generally horizontally on a fork lift truck for controlling forward and reverse speed of movement of the truck and raising and lowering forks is carried by a control device. The control device includes a shaft with a centrally positioned spherical section contained in a socket in a support member. The shaft is therefore free to rotate about the center of the sphere. A ramp cam is mounted on the support member surrounding the shaft. A slider mounted on the shaft is pressed against the cam by action of a spring. This arrangement assures that the shaft and control handle remain centered until acted upon by an operator of the truck. Two linear potentiometers provide electrical output signals representing the X (horizontal) and Y (vertical) positions of the end of the shaft opposite the control handle. The cam is provided with four distinct compound surfaces. For vertical movement of the handle, the slopes of the two lower surfaces are greater than the slopes of the two upper surfaces. The slopes of each surface are also different in the forward and reverse direction. This arrangement provides the illusion that the same force is required to move the handle in any direction. A detent in the center of the cam requires a slightly greater force to move the handle from the center position.

Multi-function control handle

Control handle for a materials handling vehicle

Growing community of inventors

Yorkshire, OH, United States of America

Brent A Bergman