JPH0411462Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides a clutch brake for a cutting blade that is disposed inside a cutting blade housing, and a rocking operation member provided on the clutch brake and the cutting blade. The present invention relates to a walk-behind lawn mower that is equipped with a mechanical interlocking mechanism that interlocks an operating lever disposed on the outside of a blade housing.

[Conventional technology]

In the above walk-behind lawn mower, conventionally, as shown in, for example, Japanese Utility Model Application Publication No. 59-68047, a rotary connection portion between the swing operation member and the interlocking mechanism is disposed inside the cutting blade housing. This resulted in the following inconveniences.

[Problem that the invention attempts to solve]

In other words, inside the cutting blade housing,
There are places where dust such as mower blades and other movable parts and grass debris blown away by the lawn discharge wind tends to accumulate, and the dust remains attached to the connection parts and becomes difficult to operate the clutch and brake. There have been cases where the clutch/brake becomes stuck between the rocking operation member and the interlocking mechanism member that slide against each other, making it difficult to operate the clutch/brake, or causing malfunction of the clutch/brake.

An object of the present invention is to provide a simple structure so that dust clogging can be easily avoided regardless of whether the connecting portion is located on either the inside or outside of the cutting blade housing.

[Means for solving problems]

The present invention is characterized in that a clutch/brake 19 for the cutting blade 3 is disposed inside the cutting blade housing 4, and the clutch/brake 19 is disposed inside the cutting blade housing 4.
A walk-behind lawn mower is provided with a mechanical interlocking mechanism 25 that interlocks a swinging operation member 20 provided at the mower 9 with an operating lever 26 disposed outside the cutting blade housing 4. 20 or the interlocking mechanism 25 is disposed through an intake hole 28 opened in the cutting blade housing 4 for supplying grass discharge air, and a connecting portion 30 between the swinging operation member 20 and the interlocking mechanism 25 is provided. , is disposed in the air path passing through the intake hole 28 opened in the cutting blade housing 4 for supplying grass discharge air, and near the intake hole 28, and its functions and effects are as follows. It is as follows.

[Effect]

In the vicinity of the intake hole, regardless of whether it is inside or outside the cutting blade housing, air flows from the outside to the inside of the cutting blade housing due to the intake action caused by the grass exhaust air supply inside the cutting blade housing. do. Therefore, if the connecting portion is placed near the intake hole, if the connecting portion is placed outside the cutting blade housing, the dust scattered inside the cutting blade housing will not adhere to the connecting portion because the cutting portion is shielded by the cutting blade housing. In addition, the flowing air prevents dust from outside the cutting blade housing from remaining attached to the connection part, and even if the dust is placed inside the cutting blade housing, The flowing air prevents dust scattered inside the blade housing from remaining attached to the connection part.

[Effect of idea]

Regardless of whether the connection part is placed inside or outside the blade housing, dust is prevented from remaining on the connection part, making it easier to avoid dust clogging, and making it easier to use the clutch and brake. It has become possible to work safely by being able to operate it easily and reliably at all times.

Moreover, the structure for supplying the grass discharge air is used as a passageway for linking the swinging operation member and the interlocking mechanism, and
It can also be effectively used as a configuration for avoiding dust clogging, and by combining these configurations, the structure can be simplified.

〔Example〕

As shown in Fig. 3, a pair of left and right front wheels 1, 1
An engine 5 for driving the cutting blade 3 is attached to the upper side of the cutting blade housing 4, which is provided with rear wheels 2, 2 and is internally installed so that the cutting blade 3 rotates around a vertical axis _P1 . In addition, a control handle 6 and a grass collection container 7 are attached to the rear of the cutting blade housing 4 to form a walk-behind lawn mower.

As shown in FIG. 5, left and right lateral side walls 7b, 7b are arranged so that the vertical width of the grass inlet/outlet 8 of the grass collection container 7 can be changed and the rear end side of the bottom wall 7a can be raised and lowered.
The lower portions of the and rear vertical wall portions 7c are configured to be able to be stretched, folded and shortened, and the grass collection container 7
When the machine is attached to the aircraft, as shown in FIG.
The rear end of the side wall portion 7b is shortened so that the front end side of the side wall portion 7b is shortened, and the shortened state is maintained by the container attachment hook 10 hung on the fuselage, and the recoverable capacity is increased. Side and rear vertical wall portions 7c
It is designed to keep it stretched out. As shown in FIG. 4, even if the rear end side of the grass collecting container 7 touches the ground when the aircraft is operated to the forward upward position for turning, etc., the horizontal side wall portion 7b and the rear vertical wall portion 7c is shortened due to the ground reaction force, allowing the aircraft to rise sufficiently and preventing damage to the container. When discharging the recovered grass, as shown in Figure 5,
By stretching the lateral wall portion 7b, the vertical width of the grass inlet/outlet 8 can be made larger than when it is attached to the aircraft so that the collected grass can be easily discharged.

As shown in FIG. 1, inside the cutting blade housing 4, a passive disk 13 is attached to the cutting blade attachment 12 which can rotate relative to the engine output shaft 11 so as to be integrally rotatable, and a brake disk 14 is attached.
Driving cylinder shaft 15 that rotates integrally with the engine output shaft 11
It is installed so that it can be rotated relative to and slidable up and down,
Although the interlocking disk 16 is engaged with the rotation stopper 17 of the cutting blade housing 4 and rotation is allowed only within a set angle due to the flexibility between the interlocking disk 16 and the rotation stopper 17, it is not allowed to rotate beyond this angle. The cutting blade housing 4 prevents rotation of the cutting blade.
The driving disk 18 is arranged between the passive disk 13 and the brake disk 14 and is attached to the driving cylinder shaft 15 so as to be integrally rotatable and vertically slidable,
A friction type clutch/brake 19 is configured to turn on and off the power transmission to the cutting blade 3 and to fix the cutting blade 3 so that it does not rotate in the transmission cut state. That is, when the operating member 20 attached to the brake disk 14 so as to be integrally rotatable is swung, the driving disk 18 is pressed against the passive disk 13 by the cam ball 21 via the linking disk 16 and the bearing 22. The clutch is engaged and the brake disc 14 is raised and separated from the driven disc 13 by the cam ball 21 to disengage the brake, or the driving disc 18 is raised and separated from the driven disc 13 by the spring 23 to disengage the clutch. ,
In addition, the brake disc 14 is pressed down from the passive disc 13 by a spring 24 to engage the brake.

As shown in FIG. 1, a release wire 2 as an example of a mechanical interlocking mechanism is attached to the swing operation member 20.
The operating lever 26, which is interlocked and connected via the
It is attached to the control handle 6 so that it swings around _P2 , and the clutch/brake 19 is set so that when it is operated to the first operating position (ON), the clutch/brake 19 is engaged and the brake is disengaged. Clutch/brake 1 when the brake is turned on
The second operating position (OFF) is where the clutch/brake 19 is engaged by the clutch disengagement by both springs 23 and 24 which bias the clutch/brake 19.
It is configured so that it is energized. Then, the operation lever 26 is moved together with the operation handle 6 to the first position.
It is configured to work while holding the operating lever 26 in the operating position (ON), and when the hand holding the operating lever 26 is released from the operating handle 6, the cutting blade 3 is automatically stopped and rotated. It is securely locked so that it cannot be moved.

As shown in FIGS. 1 and 3, the cutting blade 3 is provided with a blade portion 3a, and the cutting blade attachment 12 is provided with a rotary fan 27, which are rotatable together, and the blade portion 3a rotates and A fan 27 introduces air from the outside of the cutting blade housing 4 through an intake hole 28 provided in the cutting blade housing 4, and supplies air to be discharged from the cutting blade housing 4 in order to feed the cut grass into the grass collecting container 7. It is structured as follows.

As shown in FIGS. 1 and 2, a portion 30 where the swing operation member 20 and the release wire 25 are connected to each other by a connecting pin 29 so as to be relatively rotatable is located outside the cutting blade housing 4, and , the free end side of the swinging operation member 20 is protruded to the outside of the cutting blade housing 4 through the intake hole 28 so as to be located near the intake hole 28, and the dust scattered inside the cutting blade housing 4 is removed. The shielding action of the cutting blade housing 4 prevents dust from adhering to the rotating connecting portion 30, so that even if dust from outside the cutting blade housing adheres to the rotating connecting portion 30, the intake hole 2
8 into the cutting blade housing 4 so as to be removed by flowing air.

The swinging operation member 20 is constructed in two parts, consisting of a base end portion 20a and a free end portion 20b, and is separated by a relative sliding operation in the axial direction of the engine output shaft 11. Both operating member portions 20a and 20b are fitted and connected so that they can be connected, and although the swing operating member 20 penetrates the cutting blade housing 4, the clutch
The brake 19 is designed so that it can be assembled to and removed from the engine output shaft 11 from below the cutting blade housing 4 without dividing the brake 19 as a whole.

[Another example]

FIG. 6 shows another embodiment of the operation configuration of the clutch/brake 19, in which a swing operating member 20 and a release wire 25 provided on the clutch/brake 19 are shown.
and a rotary connecting portion 30 connected with a connecting pin 29.
is arranged near the intake hole 28 inside the cutting blade housing 4. In other words, even though the rotary connecting portion 30 is disposed inside the cutting blade housing 4 so that the clutch/brake 19 can be assembled and removed without being disassembled, dust inside the housing can be removed from the rotary connecting portion. Even if it adheres to the air inlet 30, it is removed by the flowing air introduced through the intake hole 28.

[Brief explanation of the drawing]

The drawings show an embodiment of the walk-behind lawn mower according to the present invention, in which Fig. 1 is a sectional view of the clutch/brake, Fig. 2 is a plan view of the clutch/brake operating section, and Fig. 3 is a cross-sectional view of the clutch/brake operating section.
The figure is a side view of the entire walk-behind lawn mower, Figure 4 is a side view of the front end of the machine in a lifted state, Figure 5 is a partially cutaway side view of the grass collection container, and Figure 6 is a separately implemented clutch.
FIG. 3 is a partially cutaway side view of the brake. 3...Mower blade, 4...Mower blade housing, 19...
Clutch brake, 20... Swing operation member, 2
5... Interlocking mechanism, 26... Operation lever, 28...
Intake hole, 30... Rotating connection part.

Claims (1)

[Claims for Utility Model Registration] 1. A clutch/brake 19 for the cutting blade 3 is disposed inside the cutting blade housing 4, and a swing operation member 20 provided in the clutch/brake 19 and a swinging operation member 20 for the cutting blade housing 4 are arranged. A walk-behind lawn mower is provided with a mechanical interlocking mechanism 25 that interlocks with an operating lever 26 disposed outside, the swinging operation member 20 or the interlocking mechanism 2
5 is disposed through an intake hole 28 opened in the cutting blade housing 4 for supplying grass discharge air, and a connecting portion 30 between the swinging operation member 20 and the interlocking mechanism 25 is connected to supplying grass discharge air. The walk-behind lawn mower is disposed in an air path passing through an intake hole 28 opened in the cutting blade housing 4 and near the intake hole 28. 2. The walk-behind lawn mower according to claim 1, wherein the connecting portion 30 is disposed outside the cutting blade housing 4. 3. The walk-behind lawn mower according to claim 1, wherein the connecting portion 30 is disposed inside the cutting blade housing 4.