JPH0357584Y2 - - Google Patents

Description

[Detailed description of the invention] (Purpose of the invention) ○ Industrial application field The present invention relates to a wheel vertical position changing device for a walk-behind mobile agricultural machine.

BACKGROUND ART As a device for changing the vertical position of wheels of this type, a walking type reaping and harvesting machine disclosed in Utility Model Publication No. 1983-4856 is known.

○ Problems to be solved by the invention In the above-mentioned known technology, the lock pieces, springs, operating wires, etc. of the vertical position adjustment mechanism of the drive wheels are located on the side of the machine frame and are exposed, which makes them difficult to use when working in wet fields. This has the drawback of causing mud clogging and malfunctioning of the vertical adjustment mechanism.

(Structure of the device) ○ Means for solving the problem In order to solve the above problem, the present invention provides a walk-behind mobile agricultural machine having a mechanism for adjusting the vertical position of the drive wheels. A part of the connecting frame 1 that connects the drive unit 3 of the wheel is formed into a completely closed hollow box shape that can be opened, and the lock pin 18 of the wheel vertical position adjustment mechanism 10 and the spring Along with interiorizing 19,
The end portion of the operating wire 20 is also housed inside.

○ Embodiment Figures 5 and 6 show the case where the present invention is applied to a reaping machine as a walk-behind mobile agricultural machine. A pair of left and right running wheels 7 are mounted on a shaft at the front end of a wheel drive case 6, which is connected to a drive unit 3 at the rear of the fuselage including When the connecting frame 1 is viewed from above, a pair of left and right running wheels 7,
7, and is positioned above the running wheels 7, 7 when viewed from the side. Inside the wheel drive case 6 is a transmission mechanism such as a chain and a sprocket for transmitting power between the output shaft of the drive section 3 and the axle. A wheel vertical position adjustment mechanism 10 is interposed between the central part of the connecting frame 1 and the front end of the wheel drive case 6, and a vertical adjustment load reduction means 30, which will be described later, is provided between the appropriate position of the aircraft body and the wheel drive case 6. establish.

9 is the rear end of the reaping work unit 2 or the connecting frame 1
This is a handle rod whose tip is fixed in place and extends upwards from the rear end of the fuselage.

The connecting frame 1 has a bottom end 1b fixed to the lower end of a square-shaped frame body 1a, and is sealed in a box shape and has a hollow shape, and a part of the connecting frame 1 is a completely closed hollow box-shaped part that can be opened. A wire support plate 1c is fixed to the rear part (see FIGS. 1 and 2). The rear end of the connecting frame 1 is the mounting member 1
It is fixed to the mission case 5 via d.

An auxiliary frame 25 and a mounting hitch 24 are integrally formed at the tip of the connecting frame 1, and the base of a reaping frame 26 of a reaping machine is detachably attached to the mounting hit 24. Power is transmitted to the reaping input shaft of the reaping work machine via the drive shaft 27 connected to the PTO shaft of the transmission case 5, and a bonnet 28 is disposed above the connection frame 1 and the drive shaft 27. The string case 29 can be stored freely.

Regarding the wheel vertical position adjustment mechanism 10, the first
Embodiments of the present invention will be described with reference to the drawings.

The output shaft protruding from the lower end of the transmission case 5 is a pivot shaft 8, and the wheel drive case 6 is movable up and down about the pivot shaft 8.
A cylindrical body 11 is fixed to the middle part of the cylinder 11 by passing through the cylindrical body 11 in the vertical direction. A guide cylinder 12 is provided which is inserted through the cylindrical body 11 and can freely move up and down. A pivot 13 is provided at the lower end of the guide cylinder 12.
The lower end of the connected rod 14 and the tip of the wheel drive case 6 are pivoted 15.

A guide hole 16 is passed through the cylindrical body 11 at an appropriate position within the connecting frame 1, and a plurality of lock holes 17 are formed in the guide tube 12 at intervals in the vertical direction at positions facing the guide holes 16 of the cylindrical body 11. establish.

Inside the openable completely closed hollow box-shaped portion of the connecting frame 1, a lock pin 18 is provided which passes through the guide hole 16 and can be freely engaged with the lock hole 17. A spring 19 and an end of the operating wire 20 are included to maintain the position. The other end of the operating wire 20 is connected to an operating lever that is mounted on a shaft at an appropriate position on the handle rod 9 or mounted on the rear end of the transmission case 5, and is provided at a position where the operator can operate it by hand or foot while driving. do.

In the embodiment shown in FIG. 1, the spring 19 is a compression spring, and a tension spring 19a is also provided, and two springs are installed inside. The tension spring 19a is placed between the lock pin 18 and the protrusion 22 fixed to the lock pin 18, and biases the lock pin 18 in the A direction to maintain the lock pin 18 passing through the lock hole 17 at the desired position. The structure is such that the lock pin 18 is pulled in the direction of "A" during operation. The elastic force of the tension spring 19a is set to be weaker than the elastic force of the spring 19. Further, the operation lever 23 is provided at the lower rear part of the mission case 5 so that the operator can operate it with his or her feet toward the rear, and the tension spring 19a is configured to act on the operation lever 23 over a fulcrum.

In the embodiment shown in FIG. 1, the operating lever 23 is turned off.
Even when the machine is rotated to the position, the lock pin 18 does not come out from the lock hole 17 immediately afterward, and the operator holds the handle bar 9 and moves the machine up and down to remove the lock pin 1.
8 retreats to the release position.

Next, the vertical adjustment load reduction means 30 including the spring body 31 will be explained with reference to FIGS. 4 and 1.

One end of the spring body 31 is fixed to the upright frame 33 via the spring pressure adjustment mechanism 32, and the other end of the spring body 31 is locked to the upper part 35a of the link 35 whose intermediate part is pivoted 34 to the connecting frame 1. , a roller 36 mounted on the lower part 35b of the link 35 is brought into contact with the upper surface of a stopper 37 attached to the upper surface of the intermediate portion of the axle drive case 6. The spring body 31 is a tension spring, and by applying an elastic force in the direction of the arrow a to the upper end of the link 35, the spring body 31 is applied to the stopper 37 and generates an elastic force in the direction of the arrow b, that is, a direction that pushes down the running wheels 7, 7. Apply the elastic force of

Therefore, the spring body 3 of the vertical adjustment load reducing means 30
No. 1 uses the weight of the machine to resist the descent of the machine when changing the wheel position, thereby reducing the load on the operator when operating the handle.

When operating the walking-type mobile agricultural machine (reaping machine) implementing the present invention, the traveling wheel 7 is selected from one of the plurality of lock holes 17 of the guide tube 12 of the wheel vertical position adjustment mechanism 10 and the lock pin 18 is locked. By penetrating and locking, it is maintained at the desired vertical position.

To change the vertical position of the running wheel 7, operate the operating wire 20 to disengage the lock pin 18 from the lock hole 17, and then apply the function of the vertical adjustment load reduction means 30 to move the handle bar 9 up or down. After operating the machine to move it up and down, the operating wire is operated again to lock the lock hole 17 and the lock pin 18 at a desired position.

In the above embodiment, the running wheels 7 are a pair of left and right wheels, but the present invention can also be implemented in a single-wheel walk-behind mobile agricultural machine in which one running wheel is cantilever-supported by the wheel drive case 6. Of course.

(Operations and Effects of the Invention) To change the vertical position of the traveling wheels, the operator grasps the handlebar with both hands and operates the operating lever to release the lock pin 18 from the locked state. After the wheels are in the desired vertical position, the locking pin 18 is engaged with the locking hole 17 to lock the wheel again.

As mentioned above, the present invention incorporates the lock pin and spring of the wheel vertical position adjustment mechanism in the hollow connecting frame, and also incorporates the end of the operating wire, etc., so this type of mobile agricultural machine is Although it is often necessary to adjust the running wheels up and down at Tanaka,
Since mud is not clogged in the vicinity of the lock pin, the lock pin can always be operated reliably and the lock pin will not become inoperable. In addition, rusting of operating wires, springs, etc. is prevented, improving durability, making the wheel vertical position adjustment mechanism more compact by utilizing the internal space of the connecting frame, and making the traveling wheels and connecting frame closer to each other. The connected frame has effects such as creating a scraper effect.

Furthermore, the present invention has a lock pin 18 and a spring 19 of the wheel vertical position adjustment mechanism 10 in the connection frame 1.
When arranging the operation wire 20 and the end of the operating wire 20, a part of the connection frame 1 is formed into an openable completely closed hollow box shape, so that the rigidity of the connection frame 1 can be increased, and By making it openable, it is possible to facilitate maintenance and inspection of each element of the internal wheel vertical position changing device, such as the lock pin 18, the spring 19, and the end of the operating wire 20.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a wheel vertical position changing device implementing the present invention. FIG. 2 is a longitudinal sectional view taken along line S1-S1 in FIG. 1. FIG. 3 is a longitudinal sectional view taken along line S2-S2 in FIG. 1. FIG. 4 is a plan view of the vertical adjustment load reducing means. FIG. 5 is a side view of a reaping machine implementing the present invention. FIG. 6 is also a plan view. DESCRIPTION OF SYMBOLS 1... Connection frame, 2... Working part, 3... Drive part, 6... Wheel drive case, 7... Traveling wheel,
10...Wheel vertical position adjustment mechanism, 18...Lock pin, 19...Spring, 20...Operation wire.

Claims (1)

[Scope of utility model registration request] In a walk-behind mobile agricultural machine having a plurality of locking positions, the running wheels 7 are movable up and down by the rotation of a wheel drive case 6 on which the running wheels 7 are mounted, and a working part 2 at the front of the machine body and a drive part 3 at the rear part of the machine body are used. A part of the connecting frame 1 that connects the connecting frame 1 is formed into a completely closed hollow box shape that can be opened, and a lock pin 18 and a spring 19 of the wheel vertical position adjustment mechanism 10 are installed in the fully closed hollow box shaped part of the connecting frame 1. A wheel vertical position changing device for a walk-behind mobile agricultural machine, characterized in that the end of the operating wire 20 is also housed inside.