JPS603703Y2 - Corded grass cutting blade device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cord type mowing blade device, which is a mowing blade device such as a portable power mower for weeding.

1 Conventional technology.

Conventionally, weeding operations have been carried out using a mowing blade device such as a portable power mower for weeding, which is made by rotating a disc-shaped iron plate or the like.
This disc-shaped mowing blade device is heavy, and if the cutting blade is damaged by a stone or the like, it must be replaced with a new disc-shaped mowing blade.

In addition, there is a great danger if the cutting blade is damaged.
In order to eliminate this risk, it is necessary to incorporate double or triple safety devices for protection, which has the drawback of making the device itself large, heavy, and expensive as a whole.

Further, in an attempt to eliminate the lack of disc-shaped cutting blade devices using iron plates or the like, a brush cutting device such as that described in Japanese Patent Application Laid-Open No. 52-6617 has been provided.
This brush cutting device is designed to withstand external forces by specially processing the adjacent surface of a string made of a polymer compound that is spirally wound to hold it temporarily. The disadvantage was that the string made of a polymer compound was specially processed and had special specifications, making it difficult to process and very expensive.

Problems to be Solved by the Invention The present invention eliminates the drawbacks of the prior art described above, and simplifies, reduces weight, and reduces the cost of mowing blade devices such as portable power mowers for weeding. At the same time, it also improves safety.

Means for Solving Problem 1 In order to solve the above problems, the present invention provides a set of upper and lower disc bodies 5 and 6 at the tip of the rotating shaft 17 of a portable power mower, which rotates integrally with the shaft. At least one side of the disk body 6 is made of a deformable synthetic resin material, and a flexible cord body 16 is attached to the inner surface of the plate body 6 from the center area 7 to the outer circumference area 8.
Holding members 9 and 1 that can be freely fitted and removed to hold the cord in a spiral shape
0 is provided, the periphery of the plate body 6 is bent inward to form a peripheral wall 12, and a guiding notch 13 for drawing the cord body 16 outward is provided in the peripheral wall 12 on the complicated side. and similar guiding notches 14 arranged in the radial direction so as to face the notches 13 are provided in the spiral buried groove 11,
The flexible cord body 16 made of nylon or the like is fitted into the buried groove 11 and held between the disk body 5 on the other side, and the cord body 16 is freed from the guidance notch 13 of the peripheral wall 12. The end is extended 16' to the outside so that it can rotate freely.

1 action.

According to the present invention, the flexible cord body 16 is fitted into the buried groove 11 in a long state and is crimped and clamped, so that the cord body 1
It has the characteristics of being able to withstand centrifugal force applied to the cord body 6 itself and external force such as when the free end of the cord body 16 extending outwardly extending 16' is wound around a small trunk or grass stem and pulled out, and has a buffering force.

As shown in the structure of the embodiment, it can be made lightweight and inexpensive.

In addition, the cord body has the function of storing some replenishment against wear and tear.

Next, when the free end of the cord is worn out during use and needs to be replenished, remove the free end from the notch 13 and move it to the next notch using the deformable periphery of the disc body 6. By doing so, it is possible to extend the length by the distance between the notches, and replenishment is also easy.

The diameter of the outermost periphery of the spiral buried groove 11 is preferably set so as to maintain an appropriate distance from the peripheral wall 12 of the disc body 6, and this allows freedom in deformation of the periphery. It is something that can be given.

1st example A detailed explanation will be given below with reference to drawings according to embodiments.

FIG. 1 shows a complete side view of the portable power mower of the embodiment.

FIG. 2 is a longitudinal sectional view of a cutting blade device according to an embodiment of the present invention.

FIG. 3 is a plan view taken along line Y--Y in FIG. 2.

FIG. 4 is a detailed view of a portion of FIG. 2.

The brush cutter according to the present embodiment is a portable power mower as shown in Fig. 1, in which a power source 2 is attached to the upper end of a long culm 1 into which a rotating shaft 17 is inserted, and a cutting blade device 3 is operably provided at the lower end. ing.

A handle 4 is provided near the center of gravity of the long culm 1 to facilitate work.

The cutting blade device 3 has a pair of upper and lower disc bodies 5 and 6 integrally attached to the tip of a rotating shaft 17, and rotates together with the shaft 17.

This - side disk body 6 is a deformable plate body made of synthetic resin, and the inner surface is formed from 7 near the rotation axis 17 to 8 near the outer periphery.
Cord body embedding groove 11 provided with a fitting member 910 extending over
are arranged in a spiral shape, and the peripheral wall 12 is provided by bending the periphery inward.

An appropriate number of notches 13 for guiding the cord body 16 are provided on the peripheral wall 12 for the time being.

Further, similar notches 14 are provided in the fitting members 9 and 10 of the buried groove 11 in a substantially radial shape so as to face the notches 13.
... has been established.

In this manner, a flexible cord body 16 made of nylon or the like that fits into the buried groove 11 is fitted and buried, and the flexible cord body 16 is extended outward from the peripheral wall 12 from the end 15 of the groove 11 and the nearest notch 13. It is now 16'.

This is superimposed on the disc body 5 of the above-mentioned type, and is made to be freely rotatable as a unit on the rotating shaft 17 by tightening a nut 18 or the like.

In this case, it is preferable that the upper and lower disc bodies 5 and 6 have different diameters, and that the diameter of the disc body 6 into which the cord body 16 is fitted is made larger.

Further, since the material of the disc body 5 on the holding side is not limited, a metal plate can also be used.

1. Effects of the invention According to the invention, the flexible cord body 16 is fitted into the buried groove 11 in an elongated state and is crimped and clamped, so that centrifugal force applied to the cord body 16 itself and external The free end of the cord body 16 extending 16' can withstand external forces such as wrapping around a small trunk or grass stem and being pulled out, and has a buffering force.

As shown in the structure of the embodiment, it is not only lightweight and inexpensive, but also has the function of storing a certain amount of replenishment for wear.

Next, when the free end of the cord is worn out during use and needs to be replenished, remove the free end from the notch 13 and use the fact that the periphery of the disc pair 6 is deformable to replace it with the next notch. By moving and fitting, the distance between the notches can be extended, and replenishment is also easy.

It is preferable to set the diameter of the outermost periphery of the buried groove 11 in a precurved spiral shape so as to maintain an appropriate distance from the peripheral wall 12 of the pair of disks 6, and this gives freedom in deformation of the periphery. It is useful for

As a result of the above, it is possible to provide a lightweight and inexpensive cutting blade device that maintains the same performance as a conventional cord type mower.

Incidentally, it is also possible to form a plurality of rows of the spiral-shaped buried grooves and use a plurality of cord bodies.

Furthermore, the proposed structure can be combined with a currently used metal disc-shaped rotary blade, and this device can be used in conjunction with this device to safely mow grass in areas with many stone blocks or around curbstones.

[Brief explanation of the drawing]

Figure 1 is a complete side view of a portable power mower to which the present invention has been implemented. FIG. 2 is a longitudinal sectional view of the cutting blade device according to the present invention. FIG. 3 is a plan view taken along line Y--Y in FIG. FIG. 4 is a partial detailed explanatory diagram of FIG. 2. 3...Mowing blade device, 5,6...Disc body,
9, 10... Fitting member, 11... Buried groove, 12... Peripheral wall, 13.14... Notch, 16... Flexible cord body.

Claims (1)

[Scope of utility model registration request] A pair of upper and lower discs 5 and 6 is attached to the tip of a rotating shaft 17 of a portable power mower so as to be rotatable integrally with the shaft, and at least one disc body 6 is made of deformable synthetic resin. , the plate body 6
An embedded groove 11 is provided on the inner surface of the board from near the center 7 to near the outer periphery 8 and is provided with a holding member 9° 10 into which a cord for holding the flexible cord body 16 in a spiral shape can be fitted and removed. body 6
The periphery of the cord body 1 is bent inward to form a peripheral wall 12.
A guiding notch 13 for pulling out the guide 6 outward is formed in the peripheral wall 1.
A plurality of guiding notches 14 are provided in the spiral embedding groove 11, and a plurality of similar guiding notches 14 are arranged in the radial direction so as to face the notches 13, and the flexible cord body 16 made of nylon or the like is buried in the A freely rotatable cord is fitted into the groove 11 and held between the disk body 5 on the other side so that the free end of the cord body 16 extends 16' outward from the guiding notch 13 of the peripheral wall 12. Shaped grass cutting blade device.