JPH11225534A - Mower lifting and lowering apparatus of tractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the subject apparatus capable of controlling reaping height by a simple operation in a sitting position on the operator seat of a vehicle as it is, by lifting and lowering a mower deck and installing a lower limit position operating tool for controlling and adjusting the lower limit position of the mower deck in the vicinity of an operator seat. SOLUTION: A mower deck 4 to be liftably hung and attached to a body l by linking mechanisms 2 and 3 is 1 lifted and lowered by the expansion and contraction of a lifting and lowering cylinder 5 and a lower limit position operating tool 6 for controlling and adjusting the lower limit position of the mower deck 4 is installed in the vicinity of an operator seat 7. The mower deck 4 is made into a not reaping state by raising the lifting and lowering cylinder 5 and into a lawn grass reaping position by lowering the mower deck. When the lower limit position operating tool 6 is worked by the operator seat 7, the dropping lower limit position of the mower deck 4 can be adjusted to change the reaping height of lawn grass to high/low.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevating device for elevating and lowering a mower deck mounted on a tractor, and adjusts a lower limit cutting height of the mower deck by a simple operation.

[0002]

In a mower for a tractor, the mower deck is generally moved up and down by raising and lowering a lift arm, or the mowing height is adjusted by adjusting a gauge wheel. An object of the present invention is to adjust the cutting height by a simple operation while sitting on a cockpit of a vehicle body.

[0003]

According to the present invention, a mower deck 4, which is suspended and mounted on a vehicle body 1 by means of links 2 and 3 so as to be able to move up and down, is moved up and down by expansion and contraction of a lift cylinder 5.
A mower elevating device for a tractor is provided in which a lower limit position operating tool 6 for regulating and adjusting the lowering position of the mower deck 4 is provided near the cockpit 7.

[0004]

According to the present invention, the body 1
The mower deck 4 suspended by the links 2 and 3 is moved up and down. The mower deck 4 is brought into the non-cutting posture by ascending, and becomes the turf grass cutting posture by descending. When the lower limit position operation tool 6 is operated in the cockpit 7,
Is adjusted, and the cutting height of the grass is changed to high or low.

[0005] By adjusting the lower limit position of the mower deck 4 to high or low by operating the lower limit position operation tool 6 in this manner, the turf grass cutting height can be changed. It can be performed simply and easily, and the configuration can be simplified.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vehicle body 1 has a front wheel 9 steerable by a steering handle 8 and a rear wheel 10 at a rear portion of a cockpit 7.
The tractor is a 4WD type tractor that can be driven by an engine E mounted under the front hood 11 and has link pins 14 and 15 attached to a pair of front and rear brackets 12 and 13.
The front and rear portions of the mower deck 4 are connected to link pins 16 and 17 at the rear ends of the parallel links 2 and 3 which are connected and mounted to form a mid-mount type mid-mower configuration.

The telescopic cylinder 5 for raising and lowering the mower deck 4 is provided by a hydraulic pressure or an electric motor or the like. The lift shaft 22 is provided with an arm 23 and a lift arm 21 connected to the cylinder 5, and a pair of right and left rotations having an arc-shaped long hole 24 formed around the lift shaft 22. A moving piece 25 is provided, and the front end of the lift arm 21 is further connected to the rear parallel link 3 via a lift rod 26.
Are connected by link pins 27 to the rear of the pivot connection portion 17 of the first embodiment. The arm 23 and the lift arm 21 are rotated by the expansion and contraction of the telescopic cylinder 5, and the mower deck 4 can be moved up and down via the lift rod 26.

The lower limit position operation tool 6 for determining the lowering position of the mower deck 4 has a rod 29 having a handle 28 at an upper end positioned inside a fender 30 on the side of the cockpit 7 and an upper end integrated with the fender 30. Bracket 31
The screw portion 33 is screwed to a nut pin 32 whose lower end is fitted into the elongated hole 24 of the turning piece 25. When the knob handle 28 is turned, the nut pin 32 is moved up and down to change the rotatable angle of the turning piece 25 up and down to lock the lower limit position of the mower deck 4. The nut pin 32 is the rod 2
When the nut pin 32 is moved downward and adjusted, the lower part of the mower deck 4 is lowered. The descending region of 4 is higher.

Reference numeral 34 denotes a bracket for rotatably supporting the lower end of the rod 29, which is attached to the bracket 20. Reference numeral 35 denotes a washer, 36 denotes a nut, and 37 denotes a hairpin. Rod 2
A gauge needle 38 and a gauge plate 39 having a scale are provided at the upper end of the counter 9 so as to face the cockpit 7 so that the cutting height adjustment position can be detected. The gauge needle 38 is attached to the bracket 3
The guide plate is fitted into the elongated hole 40 of the gauge plate 39 and guided. The boss portion 42 of the gauge needle 38 is screwed into the screw portion 41 of the rod 29, and when the rod 29 is rotated, the gauge needle 38 fitted and guided in the elongated hole 40.
Is moved up and down by screwing of the boss portion 42, and the adjustment position can be read by the gauge plate 39. 43 is an elongated hole formed in the bracket 34,
Guiding the swing of the lower end.

The mower deck 4 has a plurality of blades mounted thereon, and is driven and rotated by an interlock from an upper transmission case 44 to cut grass. 45 is a front gauge wheel and 46 is a rear gauge wheel. Reference numeral 47 denotes a mower transmission shaft, which is linked with a PTO shaft 48 provided on the front side of the transmission case 18. 49 is a rear PTO shaft.

When the mower deck 4 is lowered by the telescopic cylinder 5, the cutting height by the gauge wheels 45 and 46 is set to be approximately the lowest position L1 = 25 mm (example), and at this time, the nut pin 32 of the rod 29 is A is set at the lower limit of the long hole 24 of the rotating piece 25 and the minimum cutting height position L1 at this time is displayed by the gauge needle 38 and the gauge plate 39 so that A = 25 mm (example). When the knob handle 28 is turned to lower the nut pin 32 with respect to the rod 29 during the reaping operation, the lower limit position L1 of the mower deck 4 by the rotating piece 25 locked by the nut pin 32 is lowered.
Is adjusted to be higher L2 = B (B = 45 mm), and when the mower deck 4 is lowered by the telescopic cylinder 5 thereafter, the mowing deck 4 is locked and maintained at the adjusted cutting height position L2 = B. At this time, the gauge needle 38 rises (A → B).
Screw section 4 so that the cutting height is increased (L1 → L2).
By setting the directions of 1, 33 in the ascending direction, it is difficult to cause a mistake in the adjustment operation feeling, and the operability can be facilitated.

[Brief description of the drawings]

FIG. 1 is a side view.

FIG. 2 is a side view of the lower limit position operation tool unit.

FIG. 3 is a perspective view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 2 Link 3 Link 4 Mower deck 5 Elevating cylinder 6 Lower limit position operation tool 7 Cockpit

Claims (1)

[Claims] A lower position operation for raising and lowering a mower deck (4) suspended from a vehicle body (1) by means of links (2) and (3) so as to be movable up and down by extension and contraction of a lifting cylinder (5), and regulating and adjusting a lowering position of the mower deck (4). A mower elevating device for a tractor in which the tool 6 is provided near the cockpit 7.