JPS5941938Y2 - Flexible wire blade brush cutter case - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a case for a flexible wire blade brush cutter for mowing lawns, etc. by swinging a flexible wire such as a nylon cord at high speed.

A flexible wire blade with a built-in thread bobbin and a flexible thread such as nylon cord wound on the thread bobbin from the thread winding case is pulled out to an appropriate length, and is often used on the edges of buildings or in gaps. This brush cutter is useful for cutting grass, etc.

However, most of the conventional cases are made of the same material, plastic, and there are many defects in terms of structure and shape.

This invention has improved the guide plate so that even when the case is rotated with the case on the ground, the guide plate rotates smoothly with less wear, prevents sideways movement of the case, and is easy to attach and remove the case. In a case of a brush cutter in which the bobbin case and the bobbin are tightened and fixed by the bobbin case, the guide plate, and the tightening bolt, the guide plate is securely fixed to the bobbin case when tightened. Moreover, the shape and material of the bobbin case and guide plate have been devised so that they can be easily removed by hand when attaching and detaching.

Hereinafter, the configuration of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is an overall side view of a brush cutter with a case 1 of the present invention attached, and the case 1 is attached in place of a normal metal rotary blade.

The main body of the brush cutter is constructed by connecting an engine 2, a clutch case 3, a long main pipe 4, and a main shaft 5 therein, changing the direction of the rotation axis appropriately with a bevel gear case 6, and attaching the case 1. Make it.

This brush cutter is operated by holding the handle γ and the main grip 8 with one hand and operating the throttle lever 9 to open the case 10.
Adjust the rotational force, that is, the rotational force of the flexible filament 100.

FIG. 2 is an enlarged view of the left-right vertical cross-section of the case 1 in FIG. 1, and FIG. 3 is an enlarged view of the right half of the longitudinal cross-section of the case 1 in the front-rear direction.

The outline of case 1 can be explained as follows using these figures.

Case 1 is a pincushion case 11. It consists of a bobbin 12 and a bowl-shaped guide plate 13, and the three are tightened together by a tightening bolt 14 and a threaded groove 15 in the guide plate, as shown in FIG.

That is, the case 1 has a saucer-like shape and has a take-out hole 20 for the flexible wire 10 on the diameter line of the bottom or side surface, and a peg case 11 that has a tightening bolt insertion hole in the center, and a case that is housed within the peg case 11. A bowl-shaped guide plate 13 having a thread groove 15 in the center of the bobbin bobbin 12, which also serves as an upper cover, is brought into contact with the lower surface of the bobbin case 11, and a tightening bolt 14 is inserted into the bobbin bobbin 12 and the bobbin case 11 from above. It has a structure in which it is inserted and tightened together with the guide plate 13.

Furthermore, in this case 1, the top flange 16 of the bobbin bobbin 12 also serves as the top lid of the case 11, the top flange 16 is provided with ribs 1T in a cross pattern for hand rotation and reinforcement, and the bottom flange 18 is provided with a spring ball on the bottom of the bobbin case 11. A recess is provided at the contact position of 19 to facilitate rotation of the bobbin bobbin 12.

A long nylon cord is attached to a flexible wire 10 on the bobbin 12.
Both ends of the cord are pulled out from the extraction hole 20 provided on the bottom or side of the bobbin case 11, and the cord is fixed at an appropriate length of about 8 to 15 crr1 and swung around to cut grass, etc. be.

Since this case 1 rotates at high speed as a whole, it must be firmly tightened and integrated while rotating, but the tightening must be loosened each time the flexible wire 10 is replaced or refilled or pulled out. must be rotatable.

Conventional cases were either so tight that they could not be loosened easily by hand, or they were so loose that the nylon cord could come out during work, causing danger and trouble.

The present invention solves this problem by making the material of the guide plate 13 harder than the material of the bobbin case 11 to prevent digging in at the contact surface between the two.

The most preferable material for the case 1 is plastic from the viewpoint of ease of molding, but in order to satisfy the above conditions, the thread-wound case 11 is molded from polypropylene, polyethylene, polyvinyl chloride, nylon resin, ABS resin, etc. The plate 13 is preferably formed of 6-nylon resin, MC nylon resin, polycarbonate, unsaturated polyester resin, or plastics reinforced with glass fiber to impart impact resistance and abrasion resistance to these resins.

Furthermore, depending on the case, the object of the present invention can be achieved even if only the guide plate is made of metal such as aluminum alloy or iron.

An inexpensive and preferred combination is one in which the bobbin and the case are made of polypropylene resin, and the guide plate 13 is made of nylon resin.

The structural feature of the guide plate 13 is that, in addition to the above-mentioned center screw groove 15 that also serves as a tightening screw, it is shaped like a bowl and has a spherical bottom 21, which allows the case 1 to lightly touch the ground. However, when rotated, the movement is smooth, there is no horizontal wobbling like with a flat type, and the wear resistance is low, increasing durability.

An uneven surface 22 is formed on the outer periphery of the guide plate, and the bobbin case 1
If a circular protrusion 23 is formed on the bottom surface of 1 where the guide plate contacts, and the tip of the protrusion 23 is brought into contact with the guide plate, the tightening contact portion will be on the large diameter circumference and close to line contact. This makes it easier to tighten and unscrew the screw, and it is also advantageous because it prevents dust from entering the shaft core.

As detailed above, improvements have been made to both the structure and material of the bobbin case and guide plate, making it extremely easy to replenish the flexible wire inside the case, and to disassemble and assemble the case for length adjustment. Moreover, the effect of ensuring stable movement of the case during mowing was achieved.

[Brief explanation of drawings]

Figure 1 is a side view of the entire brush cutter with the case of the present invention attached.
FIG. 2 is an enlarged view of the left-right vertical cross-section of the case in FIG. 1, and FIG. 3 is an enlarged view of the right half of the longitudinal cross-section of the case in the front-rear direction.

Claims (1)

[Claims for Utility Model Registration] A bobbin case 11 that is saucer-shaped and has a take-out hole 20 for the flexible wire 10 on the diameter line of the bottom or side surface and a tightening bolt insertion hole in the center; It is stored and serves as the top lid of the case. A bowl-shaped guide plate 13 having a threaded groove 15 in the center of the bobbin bobbin 12 is brought into contact with the lower surface of the bobbin case 11, and the tightening bolt 14 is guided through the bobbin bobbin 12 and the bobbin case 11 from above. In the case where the tightening is performed integrally with the plate 13, a circular protrusion 23 is formed at the guide plate contact portion on the bottom of the bobbin case 11, and the material of the guide plate 13 is made of a material that is harder than the material of the bobbin case 11. A case for a flexible wire blade brush cutter that becomes a large item.