JPH0690605A - Riding lawn mower - Google Patents

Abstract

PURPOSE:To prevent spontaneous falling of a collector by installing an operation lever for operating a hydraulic cylinder for lifting the collector at a place close to an operator seat and further installing two locking mechanisms linked to each other with a wire, etc., on the operation lever and the hydraulic cylinder. CONSTITUTION:An operation lever 34 for operating a hydraulic cylinder for lifting a collector is installed at a place close to an operator seat, and the movement of the operation lever 34 is locked with the first locking device comprising a locking tine 40 and a locking plate 42. The second locking device for preventing spontaneous return of the elongated hydraulic cylinder is further installed. The first locking device and the second locking device are linked to each other with a mechanical linking mechanism such as a wire 56.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting device for cutting grass and weeds.

[0002]

2. Description of the Related Art There is known a riding lawn mowing apparatus which collects cut grass and grass at a collector pivotally attached to a rear portion of an airframe and raises and rotates the collector to discard the contents stored therein.
The collector is configured to be lifted substantially parallel to the ground by a lifting hydraulic cylinder and a lifting mechanism, and another dump hydraulic cylinder is configured to rotate the entire collector about a pivot point of a rear portion of the machine body.

[0003]

In such a conventional device, the hydraulic oil slightly leaks from the lift hydraulic cylinder or the hose due to deterioration or damage of the hydraulic hose after many years of use. Lift down and operate
There was a problem that the collector accidentally touched the operating lever, and as a result, the collector suddenly descended except when the grass and grass were being discharged.

[0004]

The present invention has been proposed in view of the above problems, and the following technical means have been taken. That is, in a riding lawn mower having a mower for cutting grass, a collector for storing the cut grass, and an elevating mechanism with a hydraulic cylinder for elevating the collector, an operation lever for operating the elevating mechanism near the cockpit, This operation lever
Is provided with a first lock device for fixing the movement of the hydraulic cylinder, and a second lock device for preventing natural extension of the extended hydraulic cylinder is provided, and the release of the first lock device and the second lock device is mechanically linked with a wire or the like. The riding lawnmower is characterized by being connected by means.

[0005]

Embodiments of the present invention will be described below based on the embodiments shown in the drawings. First, the structure will be explained as follows.
Is a front wheel drive type power vehicle that has large diameter front wheels 2 and 2 and small diameter rear wheels 3 and 3 and normally drives by driving only the front wheels 2 and 2.

The rear wheels 3 and 3 are steering wheels, and when the steering handle 4 is rotated, the rear wheels 3 and 3 are steered. 5 is a steering post provided at the front of the machine, 6
Is a seat, and 7 is a step, and is integrally formed with a fender 8 which covers the front wheels 2 and 2. An engine, a fuel tank, a radiator and the like (not shown) are housed in the hood 9 at the rear of the machine body, and a box-shaped collector 10 is provided above the engine.
Is attached so that it can be raised and lowered.

Reference numeral 11 denotes a parallel link mechanism composed of two upper and lower links 12 and 13. The parallel link mechanism 11 is disposed on the left and right so as to sandwich the hood 9, and its front end is a machine body erected on the rear portion of the fender 8. It is pivotally attached to the frame 15. The rear end of the parallel link mechanism 11 is pivotally attached to a plate body 17 having a triangular shape in a side view, and the left and right plate bodies 17, 17 are connected to each other by a connecting plate (not shown) that is horizontally installed.

Reference numeral 20 is a hydraulic cylinder for a dump for turning the collector 10 upside down.
7 is connected between a connecting plate connecting 7 and a reinforcing frame 18 installed on the lower surface of the collector 10. When hydraulic oil is supplied to this, a hydraulic cylinder 20 extends, and when the hydraulic oil is discharged to a tank, the hydraulic cylinder is extended. Shortens. Reference numeral 22 denotes a hydraulic cylinder for lifting the collector, the lower end of which is pivotally attached to the body frame 15 and the upper end of which is pivotally attached to the link 12 above the parallel link mechanism 11.

Reference numeral 24 denotes a cylindrical shooter for feeding grass and grass cut by a mower 25, which will be described later, to the collector 10. The shooter 24 is fixed to the side of the machine body in a stationary state. , The front end is connected to the outlet of the mower deck 68 described later, and when the collector 10 descends and is in the proper mounting position, the outlet 26 on the shooter 24 side and the collector 10 are connected.
When the weed intake 27 on the side coincides with the collector 10 ascending, only the shooter 24 is left and only the collector 10 ascends.

Reference numeral 29 denotes a lid at the rear of the collector 10, and the connecting rod 30 attached to the upper portion of the lid 29 and the plate 1 described above.
A rod 32 is interposed between the collector 7 and the collector 1.
When 0 is lifted and hydraulic oil flows into the dump hydraulic cylinder 20, the collector 10 rotates clockwise and the lid 2
9 is configured to open. Next, based on FIGS. 2 and 3, the lock device for the hydraulic cylinder 22 and the hydraulic operation lever 34 will be described.
Etc. will be described.

A hydraulic operation lever 34 for raising and lowering the collector 10 is pivotally mounted on the left side of the seat 6 so as to be swingable in the front-rear direction. Reference numeral 35 is a hydraulic control valve. When the hydraulic operation lever 34 is tilted forward, the collector 10 is lowered, and when it is tilted rearward, the collector 10 is raised. Hydraulic operation lever-3
2, 4 has a double shaft structure, a knob 38 is provided on an upper portion of the center shaft 37, and a lock claw 40 bent in an L-shape is pivotally attached to a lower end of the center shaft 37. Reference numeral 42 denotes a lock plate into which the tip of the lock claw 40 is fitted and locked, and is provided inside the lever guide 43 so as to project forward.

When the lock claw 40 is fitted into the locking hole 44 of the lock plate 42, the hydraulic operation lever 34 does not move,
Locked in neutral position. In this embodiment, the lock claw 40
And the lock plate 42 constitute a first locking device. Reference numeral 45 is a spring for urging the knob 38 to project upward, and when the lock claw 40 is removed from the locking hole 44, it is pushed down while resisting the elastic force of the spring 45. A lock plate 47, which prevents the piston rod 22a from naturally descending, is pivotally supported by a pin 48 at the end of the hydraulic cylinder 22 for lifting the collector 10 on the piston rod 22a side. Reference numeral 49 is a support member for supporting the lock plate.

The lock plate 47 is provided with a plurality of serrated locking portions 50, and the locking portions 50 are fitted and locked to the pins 52 fixed to the end surface of the hydraulic cylinder 22 to form the piston rod 2.
2a is configured to be restrained from being shortened. The lock plate 47 and the pin 52 constitute a second lock device. Further, a spring 54 is provided on the free end side of the lock plate 47, and constantly urges the pin 52 so that the serrated locking portion 50 is engaged. The free end portion of the lock plate 47 and the lock claw 40 on the hydraulic operation lever 34 side are interconnected by a wire 56, and when the lock claw 40 is disengaged from the lock plate 42, the pin 52 is abutted. The lock plates 47 that have been fitted together are interlocked so that they can be released at the same time.

Reference numeral 60 in the drawing denotes a guide frame fixed to the lower portions on the left and right sides of the front side of the collector 10. The guide frame is formed in a rectangular shape when viewed from the side, and is formed in an inverted V shape when viewed from the back. There is. When the collector 10 is lowered, the lower end of the guide frame 60 engages with the upper link 12 of the parallel link mechanism 11 from above to position the collector 10 so that it does not shake laterally during the work.

Next, the structure of the mower 25 main body mounted on the front part of the machine body will be described. A second link 64 is inserted into a tip end portion of the first link 62 pivotally supported at the lower part of the step 7 and pivoted up and down integrally with the left and right, and a connection link 65 for connecting the working machine thereto. Is configured. The second link 64 is rotatably supported by a pin 66, and is configured so that the left and right can independently swing up and down by a predetermined angle. A mower deck 68 is detachably supported by a pin 70 at the tip of the second link 64.
Three rotating shafts 71 are pivotally supported in the mower deck 68, and a cutting blade 73 is attached to the lower part of the rotating shafts 71. 74 is a gear box fixed to the upper surface of the mower deck 68, 75 is an input shaft pivotally supported by the gear box 74, 7
7 is a universal joint that connects the input shaft 75 and the vehicle-side PTO shaft, 80 is a hydraulic cylinder provided at the lower part of the machine body for moving the first link 62 up and down, and 82 is a rear portion of the mower deck 68. It is a hanging mechanism for. The suspension mechanism 82 includes a suspension rod 83,
A plate 84 fixed to the middle lateral side portion of the second link 64.
And a cylindrical boss 86 and a pin 87 for preventing the suspension rod 83 from falling off.

Reference numerals 90 and 92 are gates for supporting the mower deck 68.
These gage wheels 90 and 92 have their shafts inserted and supported by cylinders 93 and 94 that are tilted forward, and the forks 95 and 96 are soiled by forward and backward movements. It is configured to be turned back and forth by the resistance received from, and as a result, the height of the mower deck 68 from the ground changes. That is, the operator sitting in the seat 6 can drive the vehicle while paying attention to the front during the forward operation, but when the vehicle is retracted,
Since the rear of the mower deck 68 is covered with step 7 and cannot be seen, it is difficult to confirm the rear. In such a case, there is a risk that stones or hard lumps of mass may collide with the rear portion of the mower deck 68 that is supported close to the ground surface, and damage the mower deck 68.
The support shafts of the gauge wheels 90 and 92 are tilted forward so that the lifting height of the gear wheels is higher than when the vehicle is moving forward.

Next, the operation will be described. In the above-described embodiment, when the rotary parts are driven to perform the mowing work, the grass and weeds mowed by the cutting blade 73 in the mower deck 68 are collected from the outlet of the mower deck 68 via the shooter. Sent to. When the inside of the collector 10 is filled with grass or the like, the hydraulic operation lever 34 is operated to lift it, and then the dump hydraulic cylinder 20 is extended to discharge the contents therein. In this case, the collector 10 is in the raised position, but the hydraulic operating lever 34 is in the neutral position and is locked by the first locking device. Also,
Since the hydraulic cylinder 22 is also locked by the second lock device, even if the collector 10 is run for a while with the lifted up, there is no risk of the hydraulic cylinder 22 falling naturally, which is safe.

When the contents in the collector 10 are discarded at a predetermined place and lowered to the original position, the knob 38 of the hydraulic operation lever 34 is pushed to lock the lock claw 40 into the lock hole of the lock plate 42. 44, and operate this hydraulic operation lever 34 to the lower side. Then, the wire 56 whose one end is locked by the lock claw 40 is pulled, the other lock plate 47 is rotated around its pivot pin 48, and the serrated locking portion 50 is released from the pin 52. At the same time, the hydraulic cylinder 22 is released and the hydraulic cylinder 22 is shortened.

In this embodiment, the lock device is used only to prevent the lift hydraulic cylinder 22 from being lowered naturally, but the lock device is used to prevent the dump hydraulic cylinder 20 from returning spontaneously, or the lock device for both hydraulic cylinders. However, the present invention is not limited to this embodiment.

[0020]

As described above, the present invention provides a riding lawnmower having a mower for cutting grass, a collector for storing the cut grass, and a lifting mechanism with a hydraulic cylinder for moving the collector up and down, in the vicinity of the cockpit. An operation lever for operating the elevating mechanism and a first lock device for fixing the movement of the operation lever are provided, and a second lock device for preventing natural extension of the extended hydraulic cylinder is provided. Since the release of the second locking device is linked by a mechanical linking means such as a wire, the operator can
It is safe because the lifting mechanism does not operate even if the limbs of the robot accidentally touch the hydraulic operation lever. Further, even if the hydraulic hose or the like is damaged, the hydraulic cylinder is fixed by the second lock device during the work,
As in the case described above, the hydraulic cylinder is not shortened naturally, which is extremely safe.

[Brief description of drawings]

FIG. 1 is a side view of a riding lawn mower.

FIG. 2 is a cross-sectional view of a hydraulic operation lever support portion.

FIG. 3 is an enlarged side view of the lock device.

FIG. 4 is a plan view of a mower.

FIG. 5 is a side view of the mower.

[Explanation of symbols]

 1 Power Vehicle 2 Front Wheel 3 Rear Wheel 6 Seat 10 Collector 11 Parallel Link Mechanism 20 Dump Hydraulic Cylinder 22 Lift Hydraulic Cylinder 34 Hydraulic Operating Lever 40 Lock Claw 42 Lock Plate 43 Lever Guide 44 Locking Hole

Claims (1)

[Claims] 1. A riding lawn mower having a mower for cutting grass, a collector for storing the cut grass, and an elevating mechanism with a hydraulic cylinder for elevating the collector. An operating lever for operating the elevating mechanism near a cockpit. -And this operation lever
Is provided with a first lock device for fixing the movement of the hydraulic cylinder, and a second lock device for preventing natural extension of the extended hydraulic cylinder is provided, and the release of the first lock device and the second lock device is mechanically linked with a wire or the like. A lawnmower for riding, characterized by being connected by means.