JPH0628983Y2 - Cutting blade clutch operating structure for walk-behind lawn mower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a cutting blade clutch operating structure for a walk-behind lawn mower.

[Conventional technology]

Conventionally, as a cutting blade clutch operating structure of a walk-behind lawn mower,
For example, there is a structure shown in Japanese Utility Model Publication No. 60-33785, and in the operation structure of this reference, a lever for operating a cutting blade clutch is provided swingably with respect to a steering handle,
When the lever is rocked in the direction of engaging and operating the cutting blade clutch, it is necessary to push the operation member located at the rocking end of the lever prior to the rocking operation of the lever. The so-called two-action operation ensures a safe operation.

[Problems to be solved by the invention]

Further, considering the above-mentioned reference, a lock member is provided at the lower portion of the lever of the reference, the lower portion of which is oscillated forward and upward by pushing operation of an operating member located at the oscillating end of the lever. A recess that opens rearward is formed in the lower portion of the lock member, and a lock piece that enters the recess and prevents the lever from swinging is provided on the steering handle side.

However, in the reference operation structure, the rocking direction at the time of unlocking the lower end of the lock member is the front upper direction, and the rocking direction at the time of the engaging operation of the cutting blade clutch under the lever equipped with this lock member is the rear lower direction. Therefore, when the cutting blade clutch is engaged, the lock member swings in the direction approaching the lock piece. Therefore, in the operation structure of the reference, it is necessary to secure a sufficient swing stroke of the lock member, which leads to an increase in the size of the lock portion.

An object of the present invention is to miniaturize a lock portion provided on a lever as much as possible so that a cutting blade clutch can be engaged in two actions.

[Means for solving problems]

A feature of the present invention is that a steering handle is provided with a lever for operating the cutting blade clutch so that it can swing back and forth through a bracket attached to a rear portion thereof, and a lock member that swings back and forth with respect to the lever is provided. Along with, a lock piece that engages the lock member is provided on the bracket, and at the bottom of the lock member,
In the cutting blade clutch operating structure of a walk-behind lawn mower, which has a locking recess that engages with the lock piece to prevent the lever from swinging toward the cutting blade clutch, the locking recess is The lever is equipped with an operating rod for rocking the lock member in the unlocking direction that separates, along the lengthwise direction of the lever. The engagement with the lock piece is released by swinging the
It is arranged such that the rocking direction with respect to the steering handle and the lock piece is set so that the lock piece is engaged by rocking toward the side approaching the steering wheel.

[Action]

Referring to FIGS. 1 and 2, the operating lever (11) in the clutch disengaged state shown in FIG.
When the blade swings toward the front, which is the (10) side, the cutting blade clutch (6)
However, if it is left as it is, the lock member (18) is engaged with the lock piece (19) and the forward swinging operation cannot be performed. Therefore, first, the operation of releasing the engagement between the lock member (18) and the lock piece (19) is performed, and the push operation tool (16) is used to swing the lock member (18) rearward and downward. This unlocking operation moves the lock member (18) toward the artificial operation space located behind the operation lever (11), that is, the space where no mechanism exists. It is not necessary to prepare a space for allowing the stroke in the mechanism.

That is, the space required for the lever supporting and lever locking mechanism can be reduced by devising the lock release by swinging the lock member (18) away from the steering handle (10).

[Effect of device]

As a result, it has been possible to reduce the size of the lock mechanism portion configured in the lever support portion while having a two-action operation structure in which the clutch can be operated after unlocking.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 5, a cutting blade housing having a pair of left and right idler wheels (1) at the front and a pair of left and right drive wheels (2) at the rear.
The cutting blade (4), which is driven and rotated about the longitudinal axis, is installed in (3), and the engine (5) is provided on the upper part of the cutting blade housing (3), and the power from the engine (5) is provided. The cutting blade clutch (6) in the transmission system that transmits the cutting blade to the cutting blade (4), and the engine (5)
The drive case (7) for transmitting the power from the drive wheel (2) to the drive clutch (8) is provided with a traveling clutch (8). A walk-behind lawn mower is constructed by providing 10).

In the lawn mower, a cutting blade clutch lever (11) for operating the cutting blade clutch (6) and a traveling clutch lever for operating the traveling clutch (8) are provided at the rear position of the control handle (10).
(12) Each is provided.

That is, as shown in FIGS. 1 to 4, the steering handle (10) is formed by bending the pipe material into a loop shape,
A lateral gripping part (10a) is formed at the rear end, and the cutting blade clutch lever (11) swings via a support shaft (14) with respect to a bracket (13) provided on the left side of the steering handle (10). The wire (15) is movably supported, and a wire (15) is connected to the lower end of the lever (11) so that the cutting blade clutch (6) can be engaged and operated by swinging the upper part of the lever (11) forward.

This cutting blade clutch lever (11) is provided with a push operation tool (16) at the upper end of the lever (11) so that the cutting blade clutch (6) can be engaged and disengaged by a so-called two-action operation. Is provided with a lock member (18) swingable through a lateral shaft (17), and the lock member (18) is inserted into a locking recess (18a) that opens forward at the lower part of the lock member (18) and the lever is inserted.
A lock piece (19) for preventing the swinging of (11) forward (swinging of the cutting blade clutch (6) toward the insertion side) is provided on the bracket (13) and presses the upper part of the lock member (18). The operating rod (20) that swings the lower part of the lock member (18) away from the lock piece (19) is a connecting piece (18b) of the lock member (18) and the pushing operation tool (16). And an operating rod
Coil spring (21) that biases the lower end of (20) in the lifting direction
Is provided and configured.

Further, the traveling clutch lever (12) is connected to the bracket (1
3) and the bracket (2
The lever (12) is provided so as to be swingable around an axis (P) parallel to the gripping part (10a) while extending between the lever (12) and
Also, the wire (24) is connected to the tip of the arm (23) provided at the base end so that the traveling clutch (8) can be engaged and operated by swinging forward.

Furthermore, while the traveling clutch lever (12) is turned on and operated, the cutting blade clutch lever (11) is turned on and the operation is maintained.
By setting the shaft center (Q) of the support shaft (14) of the cutting blade clutch lever (11) at an angle as shown in Fig. 3, and by attaching the contact piece (25) to the upper part of the cutting blade clutch lever. During operation, the cutting clutch clutch lever (11) is turned on and then the traveling clutch lever (12) is turned on and off so that the traveling clutch lever (12) can press the rear surface of the abutment piece (25). .

That is, the lock member (18) is disengaged from the lock piece (19) by swinging the lower part provided with the locking recess (18a) away from the steering handle (10), and the steering handle (19) is released. The rocking direction is set with respect to the steering handle (10) and the lock piece (19) so that the lock piece (19) is engaged by rocking toward the side closer to (10).

[Another embodiment]

In addition to the above-described embodiment, the present invention may be implemented in various ways, for example, the lock piece may be formed of a round bar material, and the linkage may be configured so that the operating rod is brought into contact with the lock member.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a cutting blade clutch operating structure of a walk-behind lawn mower according to the present invention. Fig. 1 is a sectional view of a cutting blade clutch lever in a locked state, and Fig. 2 is a state in which the cutting blade clutch lever is in an unlocked state. FIG. 3 is a cross-sectional view of the cutting blade clutch lever, FIG. 3 is a plan view showing swing shaft cores of the cutting blade clutch and the traveling clutch, and FIG. 4 is a rear view of the cutting blade clutch and the traveling clutch in operating states, and FIG. FIG. 1 is an overall side view of a walking lawn mower. (10) …… Operation handle, (11) …… Lever, (13) …… Bracket, (18) …… Lock member, (18a) …… Locking recess,
(19) …… Lock piece, (20) …… Operating rod.

Claims (1)

[Scope of utility model registration request] A lever (11) for operating a cutting blade clutch is provided on a steering handle (10) so as to be swingable back and forth via a bracket (13) attached to the rear portion of the steering handle (10). A lock member (18) is provided so that it can swing back and forth with respect to
A lock piece (19) for engaging the lock member (18) is provided on the bracket (13), and the lever (11) is engaged with the lock piece (19) at a lower portion of the lock member (18). A cutting blade clutch operating structure of a walk-behind lawn mower in which a locking recess (18a) for preventing the swinging of the cutting blade clutch to the side of the clutch is formed, wherein the locking recess (18a) is the lock. The lever (11) is provided with an operating rod (20) for swinging the lock member (18) in a lock releasing direction away from the piece (19) in a state along the longitudinal direction, and the lock member ( 18) is that the lower part provided with the locking recess (18a) is disengaged from the lock piece (19) by swinging to the side away from the steering handle (10),
The rocking direction with respect to the steering handle (10) and the lock piece (19) is set so as to be engaged with the lock piece (19) by rocking toward the side approaching (10). A structure for operating the cutting blade clutch of a walk-behind lawn mower.