Automatic safety and alarming apparatus for construction equipments

• US 4,034,335 A
• Filed: 08/27/1975
• Issued: 07/05/1977
• Est. Priority Date: 08/30/1974
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Komatsu Seisakusho
• Original Assignee: Kabushiki Kaisha Komatsu Seisakusho
• Inventors: Okamoto, Michio, Hasegawa, Ichiro, Harazoe, Yoshiaki, Kurakami, Shigeru
• Primary Examiner(s): Swann, III, Glen R.
• Application Number:
  US05/608,261
• Time in Patent Office: 678 Days
• Field of Search: 340/52 F, 340/53, 340/267 C, 340/267 R, 340/60, 340/57, 340/52 R
• US Class Current: 123/397
• CPC Class Codes: B60K 28/00 Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions for electrically-propelled vehicles B60L3/00; road vehicle drive control systems for purposes not related to the control of a particular sub-unit B60W30/00; drive control systems specially adapted for autonomous road vehicles B60W60/00
• CPC Class Codes: F16D 66/022 indicating that a lining is worn to minimum allowable thickness
• CPC Class Codes: G07C 5/0816 Indicating performance data, e.g. occurrence of a malfunction

Abstract

Abnormal conditions of the engine and auxiliary machines mounted on a construction equipment are detected by sensors and individually displayed by a plurality of abnormal condition display circuits connected to respective sensors, for the purpose of alarming and displaying any one of the abnormal conditions there are provided a logical sum circuit connected to receive abnormal signals from all abnormal condition display circuits and an alarming circuit energized by the output from the logical sum circuit for giving audible and visible alarms. Further, there are provided a delay circuit connected to receive the output of a sensor provided for the engine system and a deceleration mechanism operated by the output from the delay circuit for decreasing the speed of the engine or stopping it when an abnormal condition occurs in the engine system.

Claims

1. An automatic safety and alarm apparatus for construction equipment comprising a plurality of sensors provided for an engine and various auxiliary devices which are mounted on said equipment for detecting the abnormal condition of said engine and said auxilliary devices, a plurality of abnormal condition display circuits respectively connected to receive the abnormal signals produced by respective sensors for independently displaying said abnormal conditions, a logical sum circuit connected to receive abnormal signals from the abnormal condition display circuit, an abnormal condition alarming circuit including an audible alarm and a visible alarm and connected to receive the output from said logical sum circuit for alarming and displaying any one of said abnormal conditions, a delay circuit connected to receive the output of a sensor provided for the engine, and a deceleration mechanism operated by the output from said delay circuit for decreasing the speed of the engine or stopping the same when an abnormal condition occurs in the engine, said deceleration mechanism comprising an electromagnetic solenoid energized by the output from said delay circuit, a first cam interlocked with an acceleration pedal, a second cam interlocked with a throttle lever of said engine, and a means responsive to the energization of said electromagnetic solenoid for coupling and decoupling said first and second cams from each other.

2. The automatic safety and alarming apparatus according to claim 1 which further comprises a sensor which detects the breakage of the fan belt by sensing when the pressure of the engine lubricating oil is normal and the generator voltage is simultaneously less than a predetermined value.

3. The automatic safety and alarming circuit of claim 1 wherein each of said abnormal condition display circuits is provided with a check circuit which produces a check signal which is the same as the abnormal signals.