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Patent Searching and Data


Title:
WORK SCOPE LIMITING DEVICE FOR CONSTRUCTION MACHINE
Document Type and Number:
Japanese Patent JPH07207712
Kind Code:
A
Abstract:

PURPOSE: To prevent a contact accident for an obstacle by obtaining deceleration degree according to the distance from a present coordinate at a monitor point to an entry prohibitiol region and thereby decelerating an actuator.

CONSTITUTION: In a microcomputer 31, a present height at each of monitor points M1-M4 is computed with a boom angle and an arm angle as variables. For the heght, a height at each of the monitor points M1-M4 after a specific time is computed on the basis of lever output signals from electric levers 16, 17. In the case where at any monitor point the reach to an entry prohibition region above, set in advance, after a specific time, is predicted, a distance from a present coordinate of the monitor point to the entry prohibition region is taken as a deceleration region. And thus, the size of the deceleration region is altered according to action speed of an actuator. Accordingly, at a posture where deceleration is not made conventionally, the frequency of deceleration is reduced.


Inventors:
FUJISHIMA KAZUO
TANAKA YASUO
SAKAMOTO YUKIO
Application Number:
JP6730794A
Publication Date:
August 08, 1995
Filing Date:
April 05, 1994
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACHINERY
International Classes:
E02F3/43; E02F9/20; E02F9/22; E02F9/24; (IPC1-7): E02F9/24; E02F3/43; E02F9/20
Attorney, Agent or Firm:
Kenjiro Take (2 outside)