JPH01144108A - Clutch operating structure for walk type mowing machine - Google Patents

Abstract

PURPOSE:To secure the safety of operation with a mowing machine by securing such a constitution where a mowing blade clutch is switched on only when two artificial operations are carried out, i.e., an operation to switch a clutch lever to its ON position and an operation an interlocking member that is operated in a different way from said clutch lever. CONSTITUTION:An interlocking member 14 is kept at an action releasing position owing to the function of a spring 16 as long as no artificial force is applied to the member 14. Then the member 14 is switched to its working position with operation of an interlocking operation tool 15 so that a clutch lever 9 interlocks an operating part 8. At the same time, a mowing blade clutch C is switched on when the lever 9 is switched to an ON position from an OFF position. Therefore the lever 9 does not interlock the part 8 and works idle in case only the lever 9 had a switching action with the member 14 having no switching action. Thus the clutch C is never turned on and therefore the safety is secured with operation of a mowing machine.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a clutch operation structure for a walk-behind lawn mower provided with a cutting blade clutch.

[Conventional technology]

In the walk-behind lawn mower, conventionally, there are two operations: an operation for switching the clutch lever from a clutch disengaged position to a clutch engaged position for manual operation of the cutting blade clutch, and an operation different from this clutch lever operation. For example, Japanese Utility Model Publication No. 60-33785 discloses a safety device in which the cutting blade is driven only by one manual operation. That is, by providing a fixing mechanism that locks the clutch lever in the clutch disengaged position in a state in which it is biased to the locked state, and by providing a manual operating tool for releasing the fixing mechanism, it is possible to disengage the mower blade clutch. When operated, the clutch lever is automatically locked in the clutch disengaged position, and the mower blade clutch is engaged by releasing the lever lock and switching the clutch lever. It is.

[Problem that the invention seeks to solve]

In the case of the conventional operation structure, forcible operating force is applied to the clutch lever without forgetting or noticing that it is necessary to release the lever lock, resulting in deformation or damage to the clutch lever or the securing mechanism as a safety device. I was once invited.

An object of the present invention is to enable the above-mentioned safety measures to be taken and to avoid damage caused by erroneous operation while simplifying the structure.

[Means for solving problems]

The clutch operation structure of the walk-behind lawn mower according to the present invention is characterized by the fact that the operation section of the cutting blade clutch and the manual operation clutch lever are mounted so as to be relatively swingable around the same axis; By sliding the interlocking member between the operating section and the clutch lever along the axis, the operating section is switched between an operating position where the operating section is engaged and an operating release position where the operating section is disengaged from the operating section. A spring is attached to the clutch lever and urges the interlocking member to the deactivation position, and an interlocking operating tool for manually operating the interlocking member to the operating position is slidably integrated with the interlocking member (14). The functions and effects are as follows.

[For production]

The interlocking member is in the deactivated position due to the spring unless an artificial scratching force is applied, and by operating the interlocking operating tool, the interlocking member is switched to the active position and the clutch lever and the operating section are in the interlocked state. The mower blade clutch is engaged by switching the clutch lever from the disengaged position to the engaged position at the same time as switching the clutch lever from the disengaged position to the engaged position. Since the lever and the operating section are not interlocked, only the clutch lever moves idly by itself, and the mowing blade clutch is not engaged.

Since the interlocking member and the interlocking operation tool are sliding types, the predetermined interlocking and uninterlocking can be performed while keeping their shape and mounting structure relatively simple or simple.

〔Effect of the invention〕

Due to the above-mentioned mounting structure of the interlocking member and the action of the spring,
The mower blade clutch can only be engaged by performing two manual operations: one to switch the clutch lever to the engaged position, and the other to operate the interlocking member, which is a different operation from this thalassotile lever operation. It has become possible to achieve the safety mentioned above.

Moreover, when only the clutch lever is operated, the clutch lever moves idly and absorbs the operating force, making it less likely to be deformed or damaged even if the clutch lever is operated erroneously. ni (became excellent).

Furthermore, since the interlocking member and the interlocking operation tool are sliding, the interlocking structure can be simplified, which is economically advantageous.

〔Example〕

Next, examples will be shown.

As shown in FIG. 6, a pair of left and right front wheels (1).

(1) and the rear wheels (2), the rear wheels (2) are attached to the upper part of the cutting blade housing (4) which is internally installed so that the cutting blade (3) rotates around the vertical axis. 2) and an engine (E) for driving the cutting blade (3), and a control handle (5) at the rear of the cutting blade housing (4).
A self-propelled walking lawn mower is constructed by attaching a grass collection container (6).

As shown in Figures 1 to 3, a release wire (7) is attached to a mower blade clutch (C) built into the mower housing (4) to turn on and off the transmission of engine power to the mower blade (3). The operation part (8) of the mowing blade clutch (C) connected via the clutch lever (9), the lever pivot hinge (10), and the lever mounting member (
11) to the same shaft center (P) as the clutch lever (9).
It is attached to the operating handle (5) so as to be relatively oscillated around υ, and the lowered position I (
The cutting blade clutch (C) is configured to be in the disengaged state due to its self-restoring force when the operating portion (8) is turned on (DN). A Rondo interlocking member (14) is attached to one end of the clutch lever (9) via an attachment arm (12) which is biased to integrally swing.

This interlocking member (14) releasably interlocks the clutch lever (9) and the operating section (8), and the distal end thereof is connected to the retaining hole of the operating section (8), as shown by the imaginary line in Fig. 3. (8
b) The operating position in which the operating part (8) and the mounting arm (12) are engaged with the operating part (8) so that they swing together, and the tip side is away from the operating part (8) as shown by the solid line. It is disconnected by sliding in the direction along the axis (Pl) to the action release position where the engagement is released so that the operating part (8) and the mounting arm (14) can swing relative to each other. It is configured to be replaced. A lever-type interlocking operation tool (15) for switching and operating the interlocking member (14) is integrally formed and connected to the interlocking member (14) so as to slide together.
5) Attachment part (15a) for the clutch lever (9)
The interlocking member (14) is moved by the spring (16) acting on the
) is configured to be switched to the action release position and biased, and the free end side of the mounting arm (12) and the operating portion (8
) is a part of the stopper (8c) as shown in Figure 4.
Clutch lever (9)
The interlocking member (1
4) and the retaining hole (8b), and due to this and the operating part (8) having the above-mentioned state due to the restoring force of the cutting blade clutch (C). Lowered position (
DN) is oscillated to the lower position (DN).
) The interlocking operating tool (15) can only be operated when the clutch lever (9) is in the clutch disengaged position (OFF) as shown in FIG. Vertical rod part (9a) of clutch lever (9)
From the interlocking cutting position (OUT) spaced apart from the vertical rod part (
By manually sliding the interlocking member (14) to the interlocking engaged position (IN) close to 9a), the interlocking member (14) can be switched from the disengaged position to the engaged position, and the clutch lever (9) and the operating part (8) are It is configured so that it can be put into a linked state. In this interlocking state, the free end of the clutch lever (9) approaches the grip portion (5a) of the control handle (5) as shown in Fig. 2, so that the clutch lever (9) can be gripped together with the control handle (5). By switching and swinging around the shaft center (P, ) to the clutch engaged position (ON), the operating part (8) becomes the raised position (UP) and the mower blade clutch (C) is engaged. In this case, the restoring force of the cutting blade clutch (C), the manual operation of the clutch lever (9), and the diameter of the retaining hole (8b) are determined by the outside of the interlocking member (14). Due to the fact that they are slightly larger than the diameter, the operation part (8) and the mounting arm (
12) swings slightly relative to each other, and the external retaining protrusion (14a) of the interlocking member (14) comes into contact with the operating section (8), thereby moving the interlocking operating tool (15) to the interlocking position (IN). The interlocking member (14) is maintained in the active position regardless of the force applied by the spring (16) without requiring manual maintenance. Then, when the grip operation to maintain the clutch lever (9) in the clutch engaged position (ON) is released, the clutch lever (9) moves to the clutch disengaged position (OF).
F), and the operating part (8) is automatically returned to the Tm position (DN) due to the disengagement restoring force of the cutting blade clutch (C), and the interlocking member (14) is activated by the spring (
16), it is configured to automatically switch to the deactivation position.

In short, move the clutch lever (9) to the clutch engaged position (
The mowing blade clutch (C) will not engage if you only switch it to ON), but you must use the interlocking operation tool (15) to switch the interlocking member (14) to the operating position and the clutch lever (9). ) to the clutch engaged position (ON), the mower blade clutch (
C) is turned on and the cutting blade (3) is driven.

Then, by gripping and operating the clutch lever (9) which has been operated to the clutch engaged position W (ON) together with the control handle (5), work is carried out while maintaining the cutting blade clutch (C) in the engaged state.

The operating lever (17) shown in FIGS. 1 and 2 is for operating a traveling clutch (not shown).

The interlocking mechanism between the operating portion (8) and the clutch lever (9) is configured such that the interlocking member is maintained at the operating position by operating the interlocking operating tool with the clutch lever. May be implemented.

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 the drawing]

The drawings show an embodiment of the clutch operation structure for a walk-behind lawn mower according to the present invention, and FIGS. 1 and 2 are side views of the clutch lever installation part, and FIG. Figure 4 is a sectional view of the operating section, Figure 5 is a rear view of the clutch lever, and Figure 6 is a rear view of the clutch lever.
The figure is a side view of the entire walk-behind lawn mower. (8)......Operation unit, (9)...Clutch lever 1 (14)...Interlocking member, (15)...
...Interlocking operation tool, (16) ...Spring, (C) ...Mower blade clutch, (Pl) ...
...Axis core.

Claims (1)

[Claims] The operating part (8) of the mowing blade clutch (C) and the manually operated clutch lever (9) are mounted so as to be able to swing relative to each other around the same axis (P_1), and the operating part (8) and the clutch lever The interlocking member (14) with the lever (9) is connected to the axis (P_1).
), the clutch lever (9) is attached to the clutch lever (9) in such a state that it can be switched between an operating position in which it is engaged with the operating part (8) and an action release position in which it is disengaged from the operating part (8). A spring (16) is provided for biasing the interlocking member (14) to the deactivation position, and the interlocking member (14) is
An interlocking operating tool (15) for manually operating 4) to the operating position.
A clutch operation structure for a walk-behind lawn mower, which is integrally and slidably connected to the interlocking member (14).