Patent ID: 8845265
Filing Date: 2014-09-30
Classification: E02F

Abstract:
1. A front loader having a spill guard link mechanism, the front loader comprising: a boom lifted and lowered by a boom cylinder; a bucket bracket pivoted and supported at a front end portion of the boom through a bucket pivot support axis; a bucket fixed by the bucket bracket and performing scooping and dumping in association with the bucket bracket rotated around the bucket pivot support axis by a bucket cylinder; a control valve allowing the bucket to perform dumping during lifting of the boom; and a spill guard link mechanism controlling the control valve to allow the bucket to perform dumping in conjunction with lifting of the boom so as to maintain a posture of the bucket, the spill guard link mechanism comprising a detection link disposed at the front end portion of the boom to detect dumping of the bucket during lifting of the boom, wherein the detection link has a front end portion pivoted and connected to the bucket bracket at a position proximate to the bucket pivot support axis, above a lower surface of the boom, and above the axis center of the bucket pivot support axis, the detection link has a rear end portion pivoted and connected to an interlock arm rotatably supported around a rotation support axis provided in an upper front portion of the boom, the spill guard link mechanism comprises: a first interlock link having a front end portion pivoted and connected to a rotation arm rotated integrally with the interlock arm and a rear end portion pivoted and connected to a first relay arm rotatably supported by a relay axis provided at a middle portion of a side surface of the boom; and a second interlock link having a front end portion pivoted and connected to a second relay arm rotatably pivoted and supported by the relay axis and a rear end portion pivoted and connected to an operation arm of the control valve, and the spill guard link mechanism is provided on a side surface of the boom of the front loader to transfer an operation of the detection link to the control valve through an interlock mechanism comprising the first interlock link and the second interlock link.