US 11,700,788 B2
Swing assistance device for brush cutter
Sung Joe Chung, Osan-si (KR)
Filed by Sung Joe Chung, Osan-si (KR)
Filed on Sep. 11, 2020, as Appl. No. 17/17,712.
Claims priority of application No. 10-2019-0137279 (KR), filed on Oct. 31, 2019.
Prior Publication US 2021/0127571 A1, May 6, 2021
Int. Cl. A01D 34/74 (2006.01); A01D 34/81 (2006.01); A01D 34/86 (2006.01); A01D 34/82 (2006.01); A01D 34/90 (2006.01)
CPC A01D 34/74 (2013.01) [A01D 34/81 (2013.01); A01D 34/824 (2013.01); A01D 34/863 (2013.01); A01D 34/902 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A swing assistance device for a brush cutter, the swing assistance device comprising:
a bracket;
a coupling unit disposed on a top surface of the bracket, and coupled to a shaft at an inclined angle;
left and right extension rods configured such that outer ends thereof are located on both sides of a blade coupled to an end of the shaft with inner ends thereof coupled to both sides of the bracket;
left and right rotation parts rotatably coupled to the outer ends of the left and right extension rods, and configured to, when the shaft swings in left-right directions, rotate while drawing arcs with respect to a ground and assist in the swing operation in the left-right directions;
a plurality of rotation rollers rotatably coupled to an outer circumference of each of the left and right rotation parts at predetermined intervals, and configured to, when the shaft swings in the left-right directions, rotate with respect to the ground and assist in the swing operation in the left-right directions by allowing the left and right rotation parts to be moved in front-back directions; and
a slope adjustment unit disposed between the coupling unit coupled to the shaft and the bracket, and configured to incline a location of the blade by changing an inclination of the shaft;
wherein the slope adjustment unit comprises:
a pivot structure coupled to the bracket and a front portion of a bottom surface of a coupling block, and to provide a pivot function such that a back portion of the bottom surface of the coupling block is spaced apart from the top surface of the bracket by a predetermined height by giving free play between the front portion of the bottom surface of the coupling block and the top surface of the bracket; and
a restoration structure coupled to the bracket and the back portion of the bottom surface of the coupling block so as to face the pivot structure, and configured to allow the back portion of the bottom surface of the coupling block to be spaced apart from the top surface of the bracket by a predetermined height and also restoring the back portion of the bottom surface of the coupling block by using the pivot structure as an axis by providing restoring force using elasticity between the back portion of the bottom surface of the coupling block and the top surface of the bracket.