JPH022183Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a mower used for weeding work, etc., and particularly relates to a new mower that ensures safety.

[Conventional technology]

Conventionally available lawn mowers have generally circular cutting blades that rotate at high speed.

In other words, it consists of a drive shaft extending from a power engine and a cutting blade rotatably provided at the tip of an operating rod that houses the drive shaft.During work, the power engine is hung from the shoulder or It was carried on one's back, and by holding an operating rod with a built-in drive shaft in one's hand, the cutting blade at the tip was swung vertically and horizontally to cut grass.

However, if the cutting blade that rotates at high speed hits a stone or the like during weeding work and breaks, etc., or if it comes off, the cutting blade will fly away and cause great damage to the worker or people nearby. There was a drawback to giving.

[Problem that the invention attempts to solve]

The present invention attempts to eliminate the above-mentioned drawbacks by reciprocating the cutting blade in a predetermined direction without rotating it as in the conventional case.

Therefore, even if the cutting blade is damaged or comes off, the cutting blade will not be scattered towards the operator, making it safe.

[Means for solving problems]

This invention solves the above problems,
A crank and a piston that convert the rotational motion of the drive shaft into reciprocating motion are provided at the tip of the drive shaft extending from the power engine and the operation stick that houses the drive shaft. The position is supported by a shaft, and the rear end of a swinging rod with a cutting blade at its tip is fixed by a shaft.

[Effect]

According to the present invention, the cutting blade is not rotated, but is operated by the swinging rod, like a windshield wiper on a car.
Mowing is performed by moving it back and forth.

Therefore, even if the cutting blade is damaged or comes off, it will fly in the specified direction and will not fly off in an uncertain direction, allowing you to carry out work while confirming safety in advance. be.

Furthermore, since the cutting blade can be formed into a substantially semicircular shape, costs can be reduced.

〔Example〕

In the drawings, 1 is a power engine, that is,
It is an engine and has a crank, an accelerator, etc.

Next, a drive shaft 2 of a predetermined length and an operating rod 3 containing the drive shaft 2 are extended from the power engine 1, and a crank is attached to the tip of the rod 3 for converting the rotational motion of the drive shaft 2 into reciprocating motion. 4 and a piston 5 are provided.

To be more specific, a housing 6 containing the crank 4, piston 5, gears, etc. is provided at the tip of the operating rod 3, and a bevel gear 7 provided at the tip of the drive shaft 2 is connected to a bevel gear 7a, 7b,
The piston 5 is caused to reciprocate by the crank 4 via the shaft 7c.

Further, the piston 5 is provided with a shaft support 8 at an appropriate position on the operation stick side, specifically on the housing 6 side.
A swinging rod 10 having a cutting blade 9 at its tip is fixed to the shaft 11.

A bearing 6a is provided on the housing 6 side of the shaft support 8 portion, and the swinging rod 10 is pivotally supported.

In the figure, reference numeral 12 denotes an operating handle, which includes an operating lever 12a of the power engine 1 and the like.

Further, an example of the cutting blade 9 is shown in FIGS. 4A and 4B.

That is, all of them have a substantially semicircular saw blade, but in the case of Fig. 4A, the blade is formed on the straight part of the saw blade, and in the case of Fig. 4B, the cutting edge is formed on the curved part of the saw blade. It is composed of

However, as described above, the cutting blade 9 is not limited to a substantially semicircular shape, but may also be substantially semicircular to provide a mowing effect when reciprocating. In that case, the cutting edge on the opposite side is in a state where the cutting blade 9 is turned over.

In the present invention having the above configuration, when the drive shaft 2 is rotated by the power engine 1, the rotational motion is transmitted from the bevel gear 7 to the bevel gears 7a, 7b, 7c, and further converted into reciprocating motion by the crank 4, and the piston 5 reciprocate.

As a result, the cutting blade 9 at the tip of the oscillating rod 10 is moved back and forth, thereby mowing the grass.

FIG. 5 shows an example in which the cutting blade 9 is not fixed to the swinging rod 10, and in addition to the reciprocating motion by the swinging rod 10, the cutting blade 9 is further oscillated.

That is, another fixed support rod 13 is provided from the housing 6 side, and a long hole 13a is provided in the fixed support rod 13, so that the pin 9a provided at the rear end of the cutting blade 9 does not come off in the long hole 13a. The swinging rod 10 is slidably engaged, and the tip of the swinging rod 10 is fixed 14 approximately in the center of the cutting blade 9.

As a result, as shown by the dashed line in the figure, the cutting blade 9 swings simultaneously with the reciprocating movement, thereby further enhancing the mowing effect.

Note that an electric motor for power may be used instead of the motor for power.

[Effect of idea]

According to the present invention, it is possible to mow grass without rotating the cutting blade at high speed.

Therefore, even if the cutting blade is damaged or comes off, it will not be blown away in an uncertain direction, unlike in the past, and safety can be ensured.

In addition, since the cutting blade can be formed into a substantially semicircular shape, cost reduction can be achieved.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is an overall front view, Fig. 2 is a plan view thereof, Fig. 3 is a sectional view taken along line A-A in Fig. 1, and Fig. 4 A and B are cross-sectional views. FIG. 5 is a plan view showing an example of the cutting blade, and a sectional view corresponding to FIG. 3 showing another embodiment. 1...Power engine, 2...Drive shaft, 3...Operation stick, 4...Crank, 5...Piston, 8,1
1...shaft stop, 9...mower blade, 10...oscillating rod.

Claims (1)

[Scope of utility model registration request] A crank and a piston that convert the rotational motion of the drive shaft into reciprocating motion are provided at the tip of the drive shaft extending from the power engine and the operation stick that houses the drive shaft. A mower characterized in that the position of the mower is supported by a shaft, and the rear end of an oscillating rod having a cutting blade at the tip is fixed to a shaft.