JPH0317620Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention relates to a deep cutting prevention mechanism in a lawn mower.

(b) Prior Art As shown in Japanese Utility Model Application Publication No. 59-62738, a grass mower is well known in which a body equipped with a cutting blade that operates along the ground is supported by wheels.

(c) Problems to be solved by the invention In the above-mentioned lawn mower, when the travel clutch is disengaged to stop the machine from mowing, the mower blades, which are still in operation, may move in the same place. In addition to the mowing action, the grass that was being mown while being pushed forward by the machine body while moving will tend to stand upright when the machine stops moving and will be cut, so only the area directly below the mower blade will be deeply mowed. There was an inconvenience in that the area was lower than the surrounding area that had already been mown, and looked whitish, spoiling the beauty of the mowing area.

In particular, when turning the machine in the middle of mowing work, for the sake of work efficiency, the mowing clutch, which is used to intermittent the motive power of the cutting blades, is not disengaged, but only the travel clutch, which is used to intermittent the mowing power, is used. The above-mentioned inconveniences occur frequently because of the switching operation.

The purpose of this invention is to solve the above-mentioned problems, and to provide a deep cutting prevention mechanism for a grass mower that has a simple structure, does not cause partial deep cutting, and can efficiently cut grass. be.

(d) Means for Solving the Problems The present invention, as shown in FIG. The vertical position of the wheel 2 is configured to be able to be switched up and down in conjunction with the operating lever 15 for the traveling clutch, and is set so that the wheel 2 is lowered relative to the fuselage 1 by switching the operating lever 15 for the traveling clutch. It is characterized by what it did.

(E) Effect When the traveling clutch operating lever 15 is turned off, the aircraft 1 stops traveling and the vertical position of the wheels 2 with respect to the aircraft 1 is lowered, increasing the ground height of the aircraft 1. Therefore, the height of the cutting blade 7 above the ground increases, and deep mowing directly below the cutting blade 7 is prevented while the machine body 1 is stopped, even though the cutting blade 7 is in the operating state.

(f) Examples Hereinafter, specific examples of the present invention will be explained with reference to the drawings.

Although the mower of the present invention may be a walking type or a riding type, the case of a walking type mower will be explained here.

1 and 2, reference numeral 1 denotes a machine body supported at a constant height from the ground by a pair of left and right front wheels 2 and rear wheels 3, respectively. A reaping section 9 is installed, which includes a reaping blade 7 to which power is transmitted via a shaft 6, a reaping section 9 surrounding the reaping blade casing 8, and the like. Wind-blowing parts 10, 10 are formed at both ends of the cutting blade 7, and wind is generated by the rotation of the wind-blowing parts 10, 10, and the grass cut by the cutting blade 7 is moved to the rear surface of the machine body 1. The grass clippings are blown out from the grass discharge port 11.
It should be noted that a grass collecting bag (not shown) is attached to the rear of the grass clippings outlet 11 so that grass clippings can be collected.

12 is a fuselage cover, and 13 is a fuel filler port.
Reference numeral 14 denotes a control handle extending toward the rear of the machine body 1, on which a control device such as a drive clutch control lever 15 or a cutting blade clutch control lever (not shown) is mounted.

Reference numeral 16 denotes a wheel drive shaft to which power is transmitted from the prime mover 4 through a running clutch 17, and a rear wheel 3 is attached to each end of the shaft so as to be symmetrically arranged.
A support plate 19 to which an axle 18 for supporting the vehicle is fixed, a vehicle height adjustment lever 20, and a retainer 21 are each fitted concentrically to the outside, and each vehicle is fitted into a fitting groove 22 formed in the support plate 19. The engagement part 23 of the high adjustment lever 20 is fitted so that these two parts are always rotated together around the wheel drive shaft 16, and when adjusting the vertical position of the rear wheel 3 with respect to the aircraft body 1, , set the vehicle height adjustment lever 20 to the aircraft 1
The engaging portion 23 of the vehicle height adjustment lever 20 is inserted into the numerous locking grooves 24 on the body 1 side by applying elastic force to the side, pulling outward against the elastic force, and rotating the lever 20.
... is selectively engaged in any of the grooves 24 of the locking member 25 in which the locking member 25 is formed. Further, the power of the wheel drive shaft 16 is transmitted to each rear wheel 3 by an appropriate transmission mechanism (not shown).

26 is a support bolt that supports the front wheel 2;
As shown in FIG.
Movable locking body 28 formed with 7, axle 2 of front wheel 2
Support plate 30 to which 9 is fixed, vehicle height adjustment lever 31
and washer 32 in order, and the engaging portion 34 of the vehicle height adjustment lever 31 is fitted into the fitting groove 33 formed in the support plate 30 in substantially the same way as in the rear wheel 3, so that both of them are fitted. are adapted to simultaneously rotate around the support bolts 26, and when adjusting the vertical position of the front wheels 2 relative to the body 1, the vehicle height adjustment lever 31 is moved around the body 1.
The movable locking member 28 is elastically biased to the side and rotated while being pulled outward against the resilient force, so that the engaging portion 34 is selectively engaged in the groove 27 of the movable locking body 28. . 35 is a spring that acts to pull the movable locking body 28 forward, and 36 is a stopper that locks the rotation of the movable locking body 28. Also,
Reference numeral 37 denotes an operating wire that connects the movable locking body 28 and the driving clutch operating lever 15, which enables the movable locking body 28 and the support plate 30 to rotate in conjunction with the driving clutch operating lever 15. It is something to do. With the above structure, the vertical position of the front wheel 2 can be switched up or down in conjunction with the driving clutch operating lever 15, and the front wheel 2 is lowered by operating the driving clutch operating lever 15.

Note that 38 and 39 are operation wires for operating the traveling clutch and the reaping clutch, respectively.

In the above configuration, when the reaping clutch operating lever and the traveling clutch operating lever 15 are operated to engage the reaping clutch 5 and the traveling clutch 17 while the prime mover 4 is in operation, the cutting blade 7 rotates and the machine body 1 progresses. As a result, the grass gets into the cutting blade casing 8 from the front of the machine body 1 while being pushed forward by the machine body 1 etc., and then is sequentially cut by the cutting blade 7 and discharged from the grass clippings discharge port 11.

When the travel clutch 17 is disengaged by operating the travel clutch operation lever 15 in order to stop the movement of the machine 1 during work, the wheel drive shaft 16
While the power transmission to is cut off, the operating wire 37 is loosened and the movable locking body 28 is pulled and rotated by the spring 35, and the vehicle height adjustment lever 31, which is locked to the movable locking body 28, is Vehicle height adjustment lever 3
The front wheels 2 are lowered relative to the fuselage 1 by rotating the support plate 30 that is locked with the front wheels 1. As a result, the advance of the machine body 1 is stopped, and the height of the front part of the machine body 1 above the ground increases, and the height of the cutting blade 7 above the ground also increases. Therefore, if the amount by which the front wheels 2... are lowered is set appropriately, the grass in the cutting blade casing 8 can be removed by the cutting blades 7 rotating while the machine body 1 is stopped.
This prevents the grass from being cut shorter than the height when it was cut during the traveling process of the machine body 1. Next, when the travel clutch operation lever 15 is operated again to engage the travel clutch 17, the front wheels 2
... returns to its original position in conjunction with the travel clutch operation lever 15, so that the grass is successively cut under the same conditions as before the machine body 1 stopped traveling.

In the above embodiment, only the front wheels 2... are moved up and down with respect to the aircraft body 1, but in the present invention, only the rear wheels 3... or all the wheels 2..., 3... are moved up and down. It doesn't make any difference.

(g) Effects of the invention As described above, according to the invention, by operating the operating lever 15 for the traveling clutch, even if the traveling of the machine body 1 is stopped while the cutting blade 7 is rotating, the operation can be easily performed. Because the mechanism lowers the vertical position of the wheel (front wheel 2 in the example), there is no need to mow the same area over and over again as in the past, and there is no need to deeply mow the grass locally. This means that it is possible to omit troublesome operation operations such as operating the mowing clutch operation lever to stop the rotation of the cutting blade 7 every time the machine body 1 stops running in order to avoid deep mowing. There are advantages such as being able to carry out efficient mowing work without damaging the mowing marks or impairing the beauty of the mowing marks.

[Brief explanation of the drawing]

The figures show a lawn mower according to the present invention, with FIG. 1 being an explanatory side view, and FIG. 2 being a sectional view taken along line A-A in FIG. 1... Airframe, 2... Front wheel, 3... Rear wheel, 7...
Cutting blade, 15...Operation lever for travel clutch.

Claims (1)

[Scope of utility model registration request] Machine body 1 equipped with a cutting blade 7 that operates along the ground
In a lawn mower supported by wheels 2 and 3,
Clutch operation lever 1 that travels in the upper and lower positions of the wheel 2
It is configured so that it can be switched up and down in conjunction with 5.
A deep mowing prevention mechanism for a lawn mower, characterized in that the wheels 2 are set to be lowered relative to the machine body 1 when the driving clutch operation lever 15 is turned.