Patent ID: 8454081
Filing Date: 2013-06-04
Classification: B60J,E02F

Abstract:
1. A sliding door safety device for heavy construction equipment, comprising: an outer side wall having a doorway formed thereon; an upper rail and a lower rail formed on an upper part and a lower part of the outer side wall, respectively; a sliding door sliding to move to a front or rear side of a cab by an upper roller and a lower roller engaged with the upper rail and the lower rail, respectively, to open or close the doorway; and first and second door position sensing switches both mounted on two sides of the outer side wall to sense a door position when the door is an open position where the door is fully opened or a closed position where the door is fully closed, wherein an upper roller support bracket is installed on the inside of the sliding door so that the upper roller is engaged with the upper rail to be rotatable, and a first switch driving member for driving the first door position sensing switch is provided on the support bracket, a lower roller support bracket is installed on the inside of the sliding door so that the lower roller is engaged with the lower rail to be rotatable, and a second switch driving member for driving the second door position sensing switch is provided on one side of the lower support bracket, an alarm is installed in the cab and is controlled by an electronic controller to provide an alarm signal when the sliding door secedes from the open position or the closed position; and a working device operation lever and a working device actuator member which are connected to the electronic controller; wherein, when the door secession signal is applied from either of the door position sensing switches, the electronic controller selectively controls the operation of the working device operation lever and the working device actuator member.