JPH04104308A - Operation lever structure of walk type cultivator - Google Patents

Abstract

PURPOSE:To stop the backing of a machine body by permitting an operation part to compulsorily cause an operation lever to incline backward so as to move it to a clutch stop position when a link lever is abutted on an operator and is turned in the middle of backing. CONSTITUTION:A recessed part 15 which bends an operation route W sideways in the stop position N of a travel clutch and which locks the operation lever 11 is provided. At a parking brake operation position P, a stepped shape 20 which is bent sideways opposite to said side-way is formed and the operation lever 11 is always pressured towards the opposite side-way. The link lever 17 which freely rocks around a lateral fulcrum X is hung. The operation part 18 which can be abutted on the front part 18a of the operation lever 11 at the upper position of fulcrum X is provided for the link lever 17 and an inclination angle theta with which the lever approaches forward as it goes the side-way is given to the part abutting on operation lever 18a in the operation part 18.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a control lever structure for a walk-behind cultivator, and more specifically, the present invention relates to a single control lever structure provided at the lower end of the control lever that is rotatable about a horizontal axis. is configured such that both the travel clutch and the parking brake can be sequentially operated by tilting the operation path of the operation guide, and when the operation lever is positioned at the front end of the operation path, the travel clutch is engaged;
The walk-behind cultivator is configured such that when the operating lever is tilted backward by a predetermined amount from its front end position, the traveling clutch is disengaged, and when the operating lever is subsequently tilted rearward, the parking brake is activated. Regarding the operation lever structure.

[Conventional technology]

The operating lever structure of this type of walk-behind cultivator allows the clutch and parking brake to be operated easily and conveniently with a single lever, and also prevents the hand from accidentally leaving the handle while the machine is moving forward. Even if this were the case, a safety feature was included in which the clutch could be disengaged by tilting the lever backwards as the aircraft moved forward, as long as one had the operating lever.

[Problem to be solved by the invention]

In addition, in order to prevent the danger of the tiller approaching when the clutch lever cannot be operated due to the aircraft or the operator's side, i.e., accidentally tipping over while in reverse mode, It was thought that the clutch could be extended downward beyond the horizontal axis, and that the extended portion would come in contact with the driver to enable clutch disengagement, thereby providing a safety function when traveling in reverse.

However, since the clutch lever is normally biased toward the entry side, with the above method, the aircraft will move toward the operator again once the lever extension is no longer in contact with the operator, so it is not safe to do so. There was still room for further improvement in terms of gender.

The present invention is aimed at solving the above-mentioned disadvantages.

[Means to solve the problem]

Therefore, in the operation lever structure of the walk-behind cultivator described at the beginning, the present invention bends the operation path laterally at the disengaged position of the traveling clutch to provide a recessed portion in which the operation lever can be locked. In the brake operating position, the lever is formed into a stepped shape bent toward the lateral side opposite to the lateral side, and the operating lever is always pressed and biased toward the lateral side opposite to the lateral side. , a link lever that is swingable around a horizontal fulcrum is suspended, the link lever is provided with an operating part that can come into contact with the front surface of the operating lever at a position above the fulcrum, and the operating part is configured to The lever abutting portion is characterized by an inclination angle such that the lateral side is closer to the front.

[For production]

(B) To explain with reference to Figures 3 and 4, the operating lever (II) is fitted onto its fulcrum (Y) with a play, and is pushed forward and to the left by a coiled spring (14). It is in force. When the operating lever (11) is tilted backward along the operating path (W) from the front clutch engaged position (F), moved to the right against the coiled spring (14) and operated into the recessed part (15). It reaches the clutch disengaged position (N), continues to tilt backward, moves to the left at the rear end of the operating path (W), and reaches the parking brake applied position (P).

When the link lever (17) comes into contact with the pilot's body while moving backward and is rotated clockwise in Fig. 1, the operating portion (18) forcibly controls the operating lever (11). The aircraft (A) is tilted backward and moved to the clutch disengaged position (N), and the aircraft (A) stops moving backward. At this time, the acting part (
The operating lever (11) is always urged to move to the right by the component force due to the inclination angle (θ) applied to the operating path (W), and the right lateral path ( 19), the operating lever (11) is forcibly moved to the right against the coiled spring (14) and the first recessed portion (1
5), the clutch is in a locked state at the clutch disengaged position (N), and the clutch disengaged state is maintained even if the link lever (17) is separated from the operator.

(b) Also, since the operating lever (11) is biased to the left, the left lateral path (2
0) has a second recessed part (16) for locking the operating lever (11).
It is not necessary to provide a parking brake, or even if it is provided, the amount of forward movement is extremely small, so there is no need to take extra allowance for operating the parking brake, and the brake can be operated reliably.

On the other hand, when biasing the operating lever (11) to the right, as shown in FIG. P), the recess amount of the second recessed portion (16) must be set sufficiently deep. Therefore, in this case, a large amount of operating distance is required for the parking brake, and as a result, the lever (11) is locked by first pulling the operating lever (11) strongly backwards and then returning it slightly forwards. Therefore, there are problems such as the parking brake's effectiveness being weak or the brake operation requiring force and being difficult to operate.However, according to the characteristic configuration described above, such problems do not occur.

〔Effect of the invention〕

Therefore, we have been able to provide an operating lever structure for a walk-behind cultivator that has improved safety due to the effect of (B), while making it possible to reliably operate the parking brake and making it easy to operate due to the effect of (U). .

〔Example〕

Next, examples will be shown.

As shown in Figure 5, a pair of left and right control handles (2), (2) are attached to the rear of a self-propelled aircraft equipped with wheels (I), an engine (E), etc., and a rotary tiller, etc. A walk-behind tiller is constructed by adding a hitch (3) for connecting various working devices.

As shown in Fig. 5, a transmission belt (6) is wound between the output belt pulley (4) of the engine (E) and the input belt pulley (5) of the transmission for working equipment and traveling (not shown). At the same time, the tension wheel (7) is swung by the swinging support arm (8), and the transmission belt (
The tension wheel (7) is configured to be tensioned or released, so that the tension wheel (7) can be switched between the engaged state and the off state by swinging the tension wheel (7).
7) to the tension release position.
The main clutch (C) is configured to be biased to the disengaged state by a helical spring (9) acting on the main clutch (C). It is equipped with a parking brake (B) (as it is a known technique, detailed structure will be omitted) that acts on the axle (1a) of the wheel (1), and its operation structure is constructed as shown in FIG. There is.

That is, the main clutch (C) and the parking brake (B) are interlocked by a main clutch wire (10), and this wire (10) is connected to the horizontal axis (
Y) It is pivotally connected to a single operating lever (11) that is rotatable around.

1st. 3. As shown in Figure 4, the operation lever (1
1) is supported by a guide tool (12) that is a sheet metal part fixed to the handlebar rod (2a), and by tilting the guide tool (12) on the operating path (W), the driving clutch (C) and the parking brake (B) are connected. Both can be operated sequentially, and when the operating lever (11) is positioned at the front end of the operating path (W), the traveling clutch (C) is engaged, and the operating lever (11) is moved backward from the front end position. When the vehicle is tilted by a predetermined amount, the traveling clutch (C) is disengaged, and when the operation lever (11) is subsequently tilted backward, the parking brake (B) is activated.

The operating lever (11) is loosely fitted onto the support shaft (13) having the horizontal axis (Y), and is attached to the clutch engagement side by the coiled spring (14) and on the left side. The operating lever (11) is biased toward the position.

In addition, the operating path (W) is set to the disengaged position (N) of the travel clutch.
) is provided with a first recessed portion (15) that can be bent to the right side to lock the operating lever (11), and a second recessed portion (15) is provided that can be bent to the left side at the parking brake activation position (P). It is formed into a stepped shape with a recessed portion (16).

A link lever (17) that is swingable around the horizontal fulcrum (X) is suspended from the guide tool (12) at the front position of the support shaft (13), and the link lever (17) is attached to the fulcrum ( X) in the upper position of the operating lever (11)
An operating portion (18) that can come into contact with the front surface portion (Ila) of the
In 8a), the inclination angle (θ) is such that the right side is much closer to the front.
has been applied.

The link lever (17) is made of a pipe material having an inverted shape when viewed from the rear, and its horizontal portion (17a) is formed long, and the acting portion (18) is formed from a bar material having an inverted shape when viewed from the rear. , the inclination angle (θ) is attached to the abutting portion (18a), which is the rightward horizontal portion. In addition, the action part (18)
and the handle rod (2a).
1) is installed, and the link lever (17) is biased rearward.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

The drawings show an embodiment of the operating lever structure for a walk-behind cultivator according to the present invention, FIG. 1 is a cross-sectional view of the structure, FIG. 2 is a diagram showing a linkage structure between a clutch and a brake, and FIG. FIG. 4 is a plan view showing the structure, FIG. 4 is a sectional view showing the support structure of the operating lever, FIG. 5 is an overall side view of the walk-behind cultivator, and FIG. 6 is a diagram showing a comparative example of the operating path. (11)... Operation lever, (Ila)...
...Front part, (12)...Guide tool, (17)
...-Link lever (18)...Action part, (
18a)...Contact part, (B)...Parking brake, (C)...Clutch, (W)...
...Operation path, (Y)...Horizontal axis center.

Claims (1)

[Claims] A single operation lever (11) that is rotatable around the horizontal axis (Y) provided at the lower end of the drive clutch (C ) and the parking brake (B) can be operated sequentially, and the operating lever (11) is connected to the operating path (W).
), the traveling clutch (C) is engaged, and when the operating lever (11) is tilted backwards by a predetermined amount from the front end position, the traveling clutch (C) is disengaged, and the operating lever is subsequently engaged. (11) An operating lever structure for a walk-behind cultivator configured such that the parking brake (B) is activated when the lever is tilted rearward, the operating lever structure being such that the operating path (W) is set horizontally at the disengaged position of the traveling clutch. A recessed portion that can be bent laterally to lock the operating lever (11) is provided, and in the parking brake activation position, it is formed in a stepped shape that is bent laterally to the side opposite to the lateral side. and a link lever (17) that always presses and biases the operating lever (11) toward the opposite side and is swingable around the horizontal fulcrum (X).
is suspended, and the fulcrum (X) is attached to this link lever (17).
The front surface of the operating lever (11) is located above the
11a), and the operating portion (18) is provided with an inclination angle such that the lever abutting portion (18a) of the operating portion (18) is inclined toward the front as the lateral side becomes more forward. The control lever structure of a walk-behind cultivator.