Liquid spreader
An herbicide spreader is capable of changing a spreading width of an herbicide. The herbicide spreader includes: a pair of upper shafts facing with a predetermined interval therebetween in a front and rear direction; a pair of side frames on left and right sides of both the upper shafts; a pair of operation handles connected to both side frames; a spray nozzle mounted to the upper shafts; wheels mounted to both side frames; and a cover sheet for covering portions of a frame main body formed with the pair of upper shafts and both side frames except the bottom. The side frames and the operation handles are rotatably connected to the upper shafts, and opening and closing angle between the left and right side frames is variable and adjusted by operating the pair of operation handles in a direction for bringing them close to or away from each other.
1 . A liquid spreader comprising:
first and second upper shafts extending in a left and right direction having a predetermined interval therebetween in a front and rear direction;
a first-side frame connected to a first side of the first upper shaft and a first side of the second upper shaft;
a second side frame connected to a second side of the first upper shaft and a second side of the second upper shaft;
first and second bar-shaped operation handles, wherein the first operation handle is fixed on the first side frame and the second operation handle is fixed on the second side frame; and
a spray nozzle that sprays a liquid into a space between the first and second side frames; wherein
the first operation handle is configured to rotate about a longitudinal axis of the first side frame, the longitudinal axis of the first side frame extending in the front and rear direction, whereby a rotational angle of the first side frame about the longitudinal axis of the first side frame is adjusted, and the second operation handle is configured to rotate about a longitudinal axis of the second side frame, the longitudinal axis of the second side frame extending in the front and rear direction, whereby a rotational angle of the second side frame about the longitudinal axis of the second side frame is adjusted, and
a distance between the first operation handle and the second operation handle changes along with at least one of (i) a change of the rotational angle of the first side frame and (ii) a change of the rotational angle of the second side frame.
2 . The liquid spreader according to claim 1 , further comprising:
at least one cover sheet that covers:
the first and second side frames,
a front region surrounded by (i) the first upper shaft which is positioned on a front side and (ii) the first and second side frames, and
a rear region surrounded by (i) the second upper shaft which is positioned on a rear side and (ii) the first and second side frames.
3 . The liquid spreader according to claim 2 , wherein
the at least one cover sheet further covers a space between the first upper shaft and the second upper shaft.
4 . The liquid spreader according to claim 1 , further comprising angle fixing brackets capable of fixing an opening and closing angle between the first and second side frames at a predetermined angle.
5 . The liquid spreader according to claim 4 , wherein:
the first operation handle and the second operation handle are each connected to a respective one of the angle fixing brackets,
the angle fixing brackets include a first bracket fixed to the first upper shaft and a second bracket fixed to the second upper shaft,
the first bracket includes a first guide hole that extends in a circular arc shape about the longitudinal axis of the first side frame, and a first fixing screw inserted into the first guide hole to fix the first operation handle to the first bracket, and
the second bracket includes a second guide hole that extends in a circular arc shape about the longitudinal axis of the second side frame, and a second fixing screw inserted into the second guide hole to fix the second operation handle to the second bracket.
6 . The liquid spreader according to claim 5 , wherein
the guide hole is a slit that is continuous along the circular arc shape.
7 . The liquid spreader according to claim 2 , wherein
the first and second side frames each include (i) a rotation shaft rotatably connected to the first and second upper shafts, (ii) a pair of vertical shafts extending downward from the rotation shaft, and (iii) a connection member connecting lower ends of the vertical shafts, and
a plurality of wheels is mounted to each connection member.
8 . The liquid spreader according to claim 7 , wherein
each connection member includes a first protrusion protruding further than a first end of the rotation shaft in the front and rear direction and a second protrusion protruding further than a second end of the rotation shaft in the front and rear direction, and
each wheel of the plurality of wheels is mounted to a respective one of the protrusions.
9 . The liquid spreader according to claim 7 , wherein
each side frame of the pair of side frames includes a cover auxiliary plate mounted for covering a gap between (i) a surface on which the liquid is spread and (ii) a respective one of the connection members.
10 . The liquid spreader according to claim 2 , wherein
each cover sheet of the at least one cover sheet is an agricultural vinyl film, and
the agricultural vinyl film is fixed to the first and second upper shafts and the first and second side frames using a plurality of stoppers.