JPH0344609Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application]
This invention relates to a structure for mounting a stand bar for wheel replacement on a tiller, which is provided with a box-shaped bracket into which the stand bar for wheel replacement is inserted and fixed.

[Conventional technology]

In such a structure for mounting a stand bar for wheel replacement on a power tiller, generally, after inserting and fixing the cylindrical stand bar for wheel replacement into the bracket, the machine body is tilted toward the non-replaceable wheel side, and the stand bar is used to tilt the machine body. The wheel to be replaced was lifted off the ground by supporting it.

By the way, when working across ridges or plowing in paddy fields, standard wheels must be replaced with larger diameter wheels. In some cases, large-diameter wheels could not be replaced because it was not possible to secure sufficient space between them.

Conventionally, when replacing a large-diameter wheel, a spacer or the like is inserted between the stand bar and the ground as necessary to greatly raise the side to be replaced.

[Problem that the invention attempts to solve]

However, as mentioned above, inserting the spacer is time-consuming and troublesome, and since there is no means of fixing the spacer to the stand bar, which adds a large amount of weight to the machine, the stand bar may slip unexpectedly, causing the large diameter wheels to slip. There was a risk that the replacement work would be dangerous.

An object of the present invention is to allow large-diameter wheels to be replaced easily and quickly, while also allowing the replacement work to be performed safely.

[Means for solving problems]

A characteristic feature of the present invention is that a protrusion is provided on a circumferential portion of the outer circumferential surface of the stand bar, the protrusion coming into contact with a portion to be inserted into the bracket.

[Effect]

That is, when replacing standard wheels, the stand bar is inserted and fixed so that the outer peripheral surface of the stand bar, which has no protrusions, is in contact with the part inserted into the bracket, thereby minimizing the inclination of the aircraft. Also, when replacing large diameter wheels,
By inserting and fixing the stand bar so that the protrusion is in contact with the part that is inserted into the bracket, the machine body is tilted significantly so that the side to be replaced is moved far away from the ground.

[Effect of idea]

Therefore, large-diameter wheels can now be replaced easily and quickly by simply changing the position of the outer peripheral surface of the stand bar that contacts the part inserted into the bracket. Moreover, since the wheel to be replaced can be lifted off the ground directly using only the stand bar without using a spacer or the like, it has become possible to safely replace large-diameter wheels.

Furthermore, when replacing the standard wheels, the stability of the aircraft can be improved as before.

〔Example〕

Figure 6 shows a walk-behind tiller, which has a pair of left and right body frames 1, 1, and an engine 2.
and a transmission case 3, a pair of left and right propulsion wheels 4, 4 are pivotally supported at the lower end of the transmission case 3, and a tilling rotary 5 and a grounding tail wheel 6 are provided at the rear end of the fuselage. It is.

The wheel replacement stand bar 8 used when replacing the wheels 4 will be described in detail below.

As shown in FIGS. 1 to 3, the round bar-shaped body 8
A small diameter portion 8a is provided at the upper end of A, and this small diameter portion 8a
A hole 8b for a β pin 10 is provided to prevent the small diameter portion 8a from coming out after the small diameter portion 8a is inserted into a small hole 7a on the upper surface of the bracket 7, which will be described later.

Further, a grounding support 9 is supported on the lower end side of the round rod-shaped main body 8A so as to be relatively swingable, and the stand bar 8 is tilted to the ground as the main body is tilted from side to side during replacement work. It is now possible to obtain a grounded posture.

Further, a protrusion 8B that is inserted into a bracket 7 (described later), that is, a protrusion 8B that comes into contact with the inner surface of the lower end of the bracket 7, is fixed by welding to a circumferential part of the upper outer peripheral surface of the round rod-shaped main body 8A.

For such a stand bar 8, a box-shaped bracket 7 that is attached to the main body frame 1 so that only the bottom surface is open has a small hole 7a for inserting the small diameter portion 8a of the stand bar 8 in the top surface. ,
The main body load is transmitted to the stand bar 8 by inserting the small diameter portion 8a.

Then, for the main body frame 1 having a groove-shaped cross section,
The auxiliary frame 11 having a groove-shaped cross section is placed in a state in which the longitudinal direction of the auxiliary frame 11 extends between the flange portions 1A, 1A of the main body frame 1, and the web portion 11B of the auxiliary frame 11 is located on the outer side of the flange 11A. The bracket 7 is fitted and fixed into the internal space of the main body frame 1, and the bracket 7 is fixed to the outer surface of the web portion 11B of the auxiliary frame 1. A band-shaped reinforcing member 12 is fixed to the lower end of the bracket 7 fixed to the auxiliary frame 1, and the stand bar 8 is connected to the small hole 7a on the upper surface of the bracket 7 and the lower end of the bracket 7.
This is used to reinforce this lower end when receiving.

To perform wheel replacement work using the stand bar 8 as described above, first insert the upper end of the stand bar 8 into the bracket 7, and attach β to the small diameter portion 8a of the stand bar 8 protruding from the upper surface of the bracket 7.
With the pin 10 inserted and fixed, the cultivator is tilted forward and brought into contact with the ground at three points: the stand bar 8, the front end of the machine frame 1, and the non-replaceable wheel 4. In the case of a large-diameter wheel, as shown in FIG.
By inserting the wheel into the wheel, the side to be replaced can be moved far away from the ground, making it easy to replace a large diameter wheel. As shown in FIG. 4, by inserting the stand bar 8 into the bracket 7 so that the surface of the stand bar 8 without the protrusion 8B comes into contact with the inner surface on the outer side of the lower end of the bracket 7, the The slope of the plane is reduced to improve the stability of the aircraft.

[Brief explanation of drawings]

The drawings show an embodiment of the stand bar mounting structure for replacing wheels of a power cultivator according to the present invention. Fig. 1 is an exploded perspective view of the stand bar and a bracket on the machine frame side, and Fig. 2 shows the stand bar attached to the bracket. Figure 3 is a cross-sectional view taken along the - line in Figure 2, Figures 4 and 5 are rear views showing how the stand bar is used, and Figure 6 is when replacing the tiller's wheels. FIG. 1... Airframe frame, 7... Bracket, 8...
...Stand bar, 8B...protrusion.

Claims (1)

[Scope of utility model registration request] This is a stand bar mounting structure for wheel replacement of a power tiller, in which a box-shaped bracket 7 for inserting and fixing a stand bar 8 for wheel replacement is provided on the outer surface of a body frame 1 having a groove-shaped cross section. The bracket 7 is attached to a part of the surface in the circumferential direction.
A stand bar mounting structure for replacing wheels of a tiller, which is provided with a protrusion 8B that comes into contact with the insertion part.