Frame leveling speed control system for an extendible boom vehicle
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 8, 2002
Grant Date -
N/A
app pub date -
Sep 3, 1998
filing date -
Sep 3, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A vehicle, such as an extendible forklift, includes a chassis or frame carrying a set of ground-engaging wheels, and a boom assembly pivotably mounted to the frame. A leveling cylinder is interposed between the frame and the wheels for leveling the frame when the vehicle is on uneven terrain and prior to raising the boom assembly to elevate a load. A switch mechanism is interposed between the frame and the boom assembly, for detecting when the boom assembly reaches or exceeds a predetermined angle relative to the frame. Actuation of the switch mechanism results in a restriction in the flow of fluid to the leveling cylinder, to reduce the speed at which the frame leveling cylinder can be operated. Simultaneously, the switch mechanism is operable to actuate the parking brake of the forklift, to prevent movement when the boom is raised above the predetermined angle. In this manner, frame leveling can only be accomplished at a slow speed when the boom assembly is at or above a predetermined angle relative to the frame.
First Claim
Other Claims data not available