JPH0642802B2 - Edge mower - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an edge mower (so-called edger) for trimming the edges of grasslands such as lawns, for example, sidewalks and boundaries with buildings.

(Prior Art) Generally, this seed edge mower includes a cutter blade 27 that is rotationally driven to the side of the main body frame 1 as shown in FIG.
For example, an operator cuts grass on the edge while pushing the operation handle 10 at the rear part.

As the clutch mechanism provided in the conventional edge mower, as shown in FIG. 5, the bearing housing 24 of the cutter blade 27 is supported on the rear swing shaft 81 via the swing arm 80, and the swing arm 80 is supported. Is rotated to lower the bearing housing 24 to extend the gap between the pulleys 36 and 37 to engage the belt 38, and the compression spring 8 provided in the middle of the swing arm 80.
3, the belt 38 is tensioned.

However, since the cutter depth (cutting height) is set at the same time the clutch is turned on, there is no room for operation at the start of work.

In addition, since the swing arm 80 vertically swings, the load on the swing shaft 81 is large.

Furthermore, the swing arm 80 on which the driven pulley 36 and the bearing housing 24 are mounted has a large movable range, which makes it difficult to cover the entire belt drive device.

By the way, conventionally, a front cover that covers only the front driven pulley 36 portion and a rear cover that covers only the rear drive pulley 37 are divided. As prior art, JP-A-62
-There is 236406 issue.

(Object of the Invention) An object of the present invention is to enable a clutch operation to be operated independently and to provide an edge that is easy to steer, as compared with an edge mower equipped with a swing arm type cutter blade support mechanism and a clutch mechanism. To provide a mower.

It is also an object of the present invention to make it possible to easily cover the entire belt drive device with a cover that covers the belt drive device.

(Technical Means for Achieving the Purpose) The present invention provides an edge mowing machine that includes a cutter blade that is rotationally driven by a belt drive device on a side of a main body frame, and that includes a belt engagement mechanism and a belt tensioner mechanism. The bearing housing that supports the cutter blade is held by a slide rod that extends rearward so as to be slidable in the front-rear direction, and the rear portion of the rod is supported by a rod guide provided on the frame so that it can move in the front-rear direction. Is equipped with a return spring that biases the bearing housing rearward, a stopper that can engage with the bearing housing is provided at the front end of the rod, and a spring that can press the bearing housing forward is compressed between the bearing housing and the rod. The bearing housing is pushed forward through a spring at the rear end of the rod. A push lever is connected to move and engage the belt.

In addition, in order to facilitate the steering operation of the edge mower, the other end of the push lever is interlocked with the clutch lever via the linkage rod mechanism, and the clutch lever is connected to the left and right
It is arranged on the opposite side of the pair of operation handles from the side where the cutter blades are arranged.

Further, in order to prevent the belt from scattering when the belt is broken, a driving pulley of the belt driving device, a driven pulley, and a belt cover that covers the entire belt are fixed to the main body frame.

(Operation) When the operator releases the clutch lever to return to the clutch-off state, the bearing housing of the cutter blade and the driven pulley provided on the cutter housing are moved rearward by the return spring, which causes the belt drive device. The belt is disengaged.

Grasping the clutch lever moves the rod, spring and bearing housing forward through the linkage rod mechanism and push lever and against the return spring, thereby engaging the belt. At the same time, a certain amount of tension is applied by the compression of the spring.

(Example) FIG. 1 is a plan view of an edge mower to which the present invention is applied,
In FIG. 1, the main body frame 1 is equipped with an engine 2, a fuel tank 3, an exhaust muffler 4, and the like, and is provided with one front wheel 8 and a pair of left and right rear wheels 9a, 9b. Left and right 1 extending upward at the rear end of the frame 1
A pair of operation handles 10 are formed, a handle grip 14 is provided on an upper end portion of the operation handle 10, and a clutch lever 18 is provided on the right handle grip 14 so as to be able to be gripped together.

The front wheel 8 is supported by a rear support shaft 13 via an arm 11 so as to be adjustable in vertical height, and the right rear wheel 9b is supported by an arm 12 extending forward so as to be adjustable in vertical height. It is supported by the shaft 13.

A cutter device such as a cutter blade 27 is provided on the left side of the body frame 1 as described above.

To describe the structure of the cutter device, brackets 19 and 19a are fixed to the left side surface of the frame 1, and a cylindrical rod guide 20 having a constant length is fixed to the brackets 19 and 19a in the front-rear direction. The rod guide 20
A slide rod 23 is inserted in and supported by the slide rod 23 so as to be movable in the front-rear direction and rotatable about its axis. Slide rod 23
Extends forward, and the boss portion 24a of the bearing housing 24 is fitted and held at the front end portion thereof so as to be slidable in the front-rear direction. A cutter shaft 26 is rotatably supported by the bearing housing 24, and a cutter blade 27 and a driven pulley 36 are fixed to the cutter shaft 26. The front end of the drive belt 38 is hooked on the driven pulley 36,
The rear end of the drive belt 38 is hung on the drive pulley 37 of the power take-off shaft (not shown) of the engine 2.

A front end portion of the slide rod 23 projects forward from the boss portion 24a, and a stopper pin 31 is provided to face the front end edge of the boss portion 24a with a space therebetween. A locking pin 32 is provided in the middle of the slide rod 23, and a spring 30 stronger than a return spring 29 (FIG. 2) described later is compressible between the locking pin 32 and the bearing housing boss portion 24a. It is installed.

The push lever 40 is rotatably supported by a bracket 43 formed integrally with the bracket 19 via a lever shaft 41, and a front link rod 46 extending rearward is pivotally connected to an upper end portion of the push lever 40. The rear end of the front link rod 46 is pivotally connected to the left relay lever 50. The left relay lever 50 is fixed to the left end of a lever shaft 51, the lever shaft 51 extends rightward and is supported in a cantilevered manner on the left and right body frame 1 portions, and the right relay lever 52 is fixed to the right end portion. Has been done. A lower end portion of a rear link rod 47 extending upward is pivotally connected to the right relay lever 52, and an upper end portion of the rear link rod 47 is interlockingly connected to a clutch lever 18 on an upper portion of the right handle, and the clutch lever 18 is connected to the grip side. The rear link rod 47 is pulled upward by rotating the link rod 47 to the upper side.

A blade guard 55 is provided on the upper half of the cutter blade 27.
And the blade guard 55 covers the bearing housing 2
It is fixed to 4. Further, the blade guard 55 is provided with a blade inclination angle adjusting lever 21 via a pin so as to be rotatable in the front-back direction.
A plurality of engagement grooves 22 are formed at the front end portion (19a) of a at intervals around the rod axis, and by selectively engaging the adjustment lever 21 with any engagement groove 22, , The angle of the cutter blade 27 is, for example, 20 from vertical.
Each can be tilted to the left or right by about °.
Reference numeral 56 is a torsion spring that biases the adjusting lever 21 to the rear engagement position.

A belt cover 53, which covers the entire drive unit, is covered on the belt drive unit including the pulleys 36 and 37 and the drive belt 38, and the belt cover 53 is fixed to the frame 1 by bolts 60 or the like. . Of course, the length of the belt cover 53 in the front-rear direction is set to a size that allows the bearing housing 24 to move in the front-rear direction.

In FIG. 2 showing the left side view, a return spring 29 for urging the bearing housing 24 rearward is stretched between the bearing housing 24 and the bracket 19.

The operation will be described. FIG. 3 shows a state in which the clutch is disengaged. That is, when the clutch lever 18 is actually released, the bearing housing 24 and the slide rod 23 are moved rearward by the rearward pulling force of the return spring 29, and the front link rod 46 is moved forward via the push lever 40. The rear side link rod 47 is moved downward via the relay levers 50 and 52, and the clutch lever 18 is returned to the front and maintained. As a result, the drive belt 38 is maintained in a state of being separated from the drive pulley 37 while the rear end portion thereof is guided by the guide 61.
That is, the disengagement state is maintained.

When the clutch is turned on for the edge cutting work, the clutch lever 18 is pulled backward as shown in FIG. 2 and is held together with the handle grip 14.

In the above-described rotation operation of the clutch lever 18, the strong spring 30 is not compressed in the range of the first fixed rotation amount, and only the return spring 29 is extended forward so that the bearing housing 24
Moves forward and the belt 38 engages. Then, by further rotating the clutch lever 18 to the final position, the spring 30 is compressed and a constant tension is applied to the belt 38. At this time, the stopper pin 31 at the front end of the slide rod is separated from the front end edge of the boss portion 24a of the bearing housing 24 to the front.

For grip cutting, clutch lever 18 and handle grip 1
With 4, hold it with your right hand and mainly steer your mower with your left hand.

As shown in FIG. 4, the left rear wheel 9a and the front wheel 8 are on the curb T of the sidewalk.
When carrying out the work by carrying the vehicle, the position of the right rear wheel 9b is lowered.

The cutter depth is adjusted by changing the height of the front wheels 8 in the vertical direction. For example, when the position of the front wheel 8 is lowered, the cutter blade 27 relatively rises and the cutting height increases. On the contrary, when the front wheel 8 is raised with respect to the frame 1, the cutting height is shortened.

When the clutch is disengaged, the clutch is automatically disengaged when the operator releases the hand, for example.

(Other embodiment) In the model in which the cutter blade is arranged on the right side, the clutch lever is arranged on the left side.

(Effects of the Invention) According to the present invention as described above: (1) The bearing housing of the cutter blade is supported on the main body frame by a slide rod or the like so as to be movable in the front-rear direction, and the belt is driven by moving the bearing housing in the front-rear direction. Since the device is engaged and disengaged, the clutch can be engaged and disengaged irrespective of the adjustment of the cutting height, and the operation before work can be afforded as compared with the conventional swing arm type support mechanism.

(2) The bearing housing is supported by the slide rod so as to be slidable in the front-rear direction, and the slide rod is supported by the rod guide so as to be movable in the front-rear direction. Strength is improved and durability is improved.

(3) Since the bearing housing is moved in the front-rear direction to engage the belt drive device, a belt cover for covering the entire drive device can be easily provided as compared with the conventional swing arm type. This improves the durability of the belt.

(4) By equipping the operation handle on the side opposite to the cutter blade arrangement side with the clutch lever, the operation handle on the cutter blade arrangement side on which the center of gravity of the machine body is applied
Mainly allows the maneuvering operation of the aircraft, which makes the operation easier.

(5) When the operator leaves the operation handle from the state of gripping the clutch-on clutch lever, the clutch lever 18 is automatically rotated instantaneously by the extension force of the compressed tensioner spring and the return force of the return spring. The clutch is turned off. So-called deadman control is possible.

[Brief description of drawings]

FIG. 1 is a plan view of an edge mower to which the present invention is applied, FIG. 2 is a side view of a clutch transmission mechanism in a clutch on state, and FIG. 3 is a side view of a clutch transmission mechanism in a clutch off state.
FIG. 5 is a front view showing a working state, and FIG. 5 is a side view of a conventional clutch transmission mechanism. 1 ... Main body frame, 10 ...
… Operation handle, 18 …… Clutch lever, 20 …… Rod guide, 23 …… Slide rod, 24 …… Bearing housing, 27 …… Cutter blade, 29 …… Return spring, 30 …… Spring, 31 …… Stopper pin , 36
...... Driven pulley, 37 …… Drive pulley, 38 ……
Drive belt, 40 ... Push lever, 46 ... Front link rod, 47 ... Rear link rod, 53 ... Belt cover

Claims (3)

[Claims] 1. In an edge mowing machine having a cutter blade rotatably driven by a belt driving device on a side of a main body frame and having a belt engagement mechanism and a belt tensioner mechanism, a bearing housing for supporting the cutter blade is rearwardly arranged. Is held slidably in the front-rear direction by a slide rod extending in the direction
A return spring that biases the bearing housing backward is stretched between the rod guide and the bearing housing, a stopper that can engage with the bearing housing is provided at the front end of the rod, and a bearing housing is provided between the bearing housing and the rod. A spring that can press forward is compressively interposed, and a push lever that engages the belt by pushing the bearing housing part forward through the spring is connected to the rear end of the rod. Edge mower. 2. The other end of the push lever is interlockingly connected to a clutch lever via a linkage rod mechanism, and the clutch lever is provided on the opposite side of the pair of left and right operation handles from the side on which the cutter blade is arranged. The edge mower according to claim 1, which is arranged. 3. The edge mower according to claim 1, wherein a driving pulley, a driven pulley of the belt driving device and a belt cover for covering the entire belt are fixed to the main body frame.