JPH0746925A - Rotary cutting blade of power bush cutter - Google Patents

Abstract

PURPOSE:To provide the rotary cutting blade of a power bush cutter, not requiring the carriage of an elastic cord and capable of being continuously used by the automatic projection of the elastic cord even on the abrasion of the elastic cord. CONSTITUTION:The rotary cutting blade of a power bush cutter is provided with a disk 9 detachably mounted on the rotation shaft of the power bush cutter, a revolved depression 10 formed on the outer periphery of the disk and opened in the radially direction, an elastic cord 15 wound up on the revolved depression in the reverse-rotation direction of the disk in a state that the folded part of the cord is fixed to the bottom of the revolved depression, and plural pins 13 arranged in the circumferential direction of the disk 9 in a state that each of the pins can be transferred between a fixed position crossing over both the sides 10b of the revolved depression 10 and a released position separated from one of the sides.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary cutting blade of a power brush cutter which is detachably attached to a rotary shaft of the power brush cutter for use.

[0002]

2. Description of the Related Art FIG. 15 is a bottom view showing a rotary cutting blade of a conventional power brush cutter disclosed in, for example, Japanese Utility Model Publication No. 2-9626, and FIG. 16 is a sectional view taken along line XVI-XVI in FIG. In the figure, reference numeral 1 denotes a disc detachably mounted on a rotary shaft (not shown) of a power brush cutter, and a disc 1a having a central hole 2 through which the rotary shaft passes and a portion near the outer periphery of the disc 1a. The annular plate 1b is welded by means such as spot welding. 3 is an elastic cord such as a hard synthetic resin cord or a spring material cord, 4 is a plurality of radial mounting holes for inserting the elastic cord 3 provided around the disk 1 so as to project outward in the radial direction, The groove 5 is formed by pressing the annular plate 1b. Reference numeral 6 denotes a circular step portion formed by denting the central portion of the disc 1a toward the annular plate 1b, and the pressing surface 7 is formed by the outer peripheral slope.

The elastic cord 3 is inserted into the mounting hole 4 from the outside, the tip projecting inward is folded back and inserted into the adjacent mounting hole 4 from the inside, and then the elastic cord 3 is pulled outward to bend the bent portion 3a. Tighten as shown in the figure,
Is pressed by the pressing surface 7 and fixed in a state of being laterally inclined against the elasticity. In this state, since the folded back curved portion 3a is fitted between the pressing surface 7 and the bent portion 8 of the annular plate 1b by the elastic force, the elastic cord 3 does not fall off.

[0004]

Since the rotary cutting blade of the conventional power brush cutter is constructed as described above, when the attached elastic cord 3 is worn due to use, a new short size cutting blade is required. The elastic cord 3 has to be inserted one by one, and the work of inserting the elastic cord 3 is required during the work, which not only deteriorates the workability, but also the elastic cord 3 must be prepared and carried. there were.

The invention of claim 1 has been made to solve the above-mentioned problems, and it is not necessary to carry the elastic cord, and even if the elastic cord is worn, the elastic cord automatically projects so that it can be continuously used. The purpose is to obtain a rotary cutting blade for a brush cutter.

It is another object of the present invention to provide a rotary cutting blade for a power brush cutter, which has a good workability and can fix and release a plurality of pins collectively.

[0007]

According to a first aspect of the present invention, there is provided a rotary cutting blade for a power brush cutter, comprising a disk body detachably mounted on a rotary shaft of the power brush cutter, and an outer periphery of the disk body. A circumferential concave portion provided and opening in the radial direction, and an elastic cord wound in the circumferential concave portion in the counter-rotational direction of the disk body in a state where the folded portion folded in two is stopped at the bottom of the circumferential concave portion. A plurality of discs are arranged in the circumferential direction of the disc body, and a pin for moving the disc to a fixed position that straddles both sides of the circumferential recess and a release position that is separated from one side is provided.

According to a second aspect of the present invention, a pin fixing body for moving the pins together to fix the pin to the disk body and a releasing position away from one side portion is provided in the circumferential recess of the disk body. is there.

[0009]

According to the invention of claim 1, since both ends of the elastic cord are locked to the pins and project from the circumference of the disk body by a predetermined length, when both ends of the elastic cord are worn and come off the pins,
It is locked to the next pin and protrudes again for a predetermined length. Then, when each pin is moved to the release position, each pin separates from one side of the circumferential recess, so that the elastic cord can be folded in two from the gap and wound around the circumferential recess, and each pin can be placed in the fixed position again. Fix and use.

According to the second aspect of the present invention, when the pins are collectively set to the release position by the pin fixing body, the pins are simultaneously separated from one side of the circumferential recess, so that the elastic cord is folded in two from the gap. Then, the pins can be wound around the circumferential recessed portion, and again the pins are collectively fixed to the fixing position by the pin fixing body for use.

[0011]

【Example】

Example 1. An embodiment of the invention of claim 1 will be described with reference to FIGS. 1 is a plan view with the lower half open, FIG. 2 is a side view with the rotary shaft mounted, FIG. 3 is a side view showing the pin released from FIG. 2, and FIG. 4 is a line IV in FIG. −IV
5 is a sectional view taken along the line VV of FIG. 1, and FIG. 6 is a sectional view of FIG.
FIG. 6 is a cross-sectional view showing a state in which the disc body of FIG.

In the figure, reference numeral 9 denotes a disk body having a circular recess 10 which is open in the radial direction on the outer circumference, and is constituted by fixing an upper disk 11 and a lower disk 12 by spot welding.
The upper disk 11 includes a shaft insertion hole 11a and a welding plate portion 11 around the shaft insertion hole 11a.
b and three pin insertion holes 11c arranged at equal intervals in the circumferential direction of the portion forming one side surface 10a of the circumferential recessed portion 10, the lower disk 12 has the other side surface 10 of the circumferential recessed portion 10.
The stepped portion 12 recessed upward so as to form the pin screwing screw hole 12c and the bottom surface 10c of the orbiting recessed portion 10 which are provided at three positions in the portion forming b and face the pin insertion hole 11c.
d, a shaft insertion hole 12a provided on the step thereof, and a welding plate portion 12b around the shaft insertion hole 12a. Reference numeral 13 denotes a pin that is inserted into the pin insertion hole 11c and is attached to the pin screwing screw hole 12c, and is engaged with the screw portion 13a screwed into the pin screwing screw hole 12c and the inner peripheral edge of the pin screwing screw hole 12c. It has a flange 13b and a screwdriver groove 13c protruding outside the pin insertion hole 11c. Reference numeral 14 is two cord insertion holes provided in the step portion 12d of the lower disk 12, and 15 is an elastic cord such as a hard synthetic resin cord or a spring material cord.
After being inserted into the fold and folded in two, it is wrapped around the inside of the recess 10 and has a good length of about 2 m.

As shown in FIG. 6, after the pins 13 are respectively fitted into the screw holes 12c for pin screwing of the separated lower disk 12 by screwing the screw portions 13a thereof, the upper disk 11 is respectively inserted into the pin insertion holes 11c. The upper and lower discs 11 and 12 are attached to the welding plate 11 by aligning them with the lower disc 12 with the pin 13 inserted.
Fix with b and 12b. As shown in FIG. 5, this is attached to the rotary shaft 16 of the power brush cutter by a holding plate 17 and a nut 18.

This rotary cutting blade is turned upside down and each pin 1
3 are each screw-turned by the screw-turn groove 13c,
When a is removed from the screw hole 12c for pin screwing, as shown in FIG. 3, each pin 13 is in an open position in which it is dangling toward the upper disk 11 side by the collar 13b, so that the clearance is used to insert the cord into the cord insertion hole 14. Elastic cord 1 inserted and folded in half
Wrap 5 in the counter-rotational direction as shown in FIG. Then, when each pin 13 is turned by the screw turning groove 13c to attach the screw portion 13a to the pin screwing screw hole 12c, each pin 13 is moved to the upper and lower discs 11, 12 as shown in FIG.
Since it is in the fixed position where it is fixed in between, both ends of the elastic cord 15 are locked to the pin 13 and project from the periphery of the disk body 9 for a predetermined length as shown in FIGS. In the state shown in FIGS. 1 and 2 in which both ends of the elastic cord 15 are locked to the pin 13 and project from the circumference of the disk body 9 by a predetermined length, both ends of the elastic cord 15 are worn and the pin 13 is used. When it is disengaged, it is locked to the next pin 13 and protrudes again for a predetermined length, so continuous use is possible. Further, when the elastic cord 15 is wound, the elastic cord 15 can be easily wound while the product is attached to the rotary shaft 16 of the brush cutter.

Example 2. An embodiment of the invention of claim 2 will be described with reference to FIGS. 7 is a plan view with the lower half opened, FIG. 8 is a side view with the rotary shaft mounted, and FIG. 9 is a side view with the pins released from FIG.
9 is a cross-sectional view taken along the line XX of FIG. 9, FIG. 11 is a cross-sectional view taken along the line XI-XI of FIG. 7, FIG. 12 is a cross-sectional view showing a state in which the disc body of FIG. 11 is disassembled, and FIG. 13 is the line of FIG. FIG. 14 is a sectional view taken along the line XIV-XIV in FIG. 13, viewed from XIII-XIII. The same or corresponding parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the figure, 19 is a pin insertion hole provided in the lower disk 12, which is replaced with the pin screwing screw hole 12c of the first embodiment. Reference numeral 20 denotes a pin that is inserted into each of the pin insertion holes 11c and 19 and includes a collar 20a that engages with the inner peripheral edge of the pin insertion hole 19 and a circumferential groove 20 that is located inside the pin insertion hole 11c.
b. Reference numeral 21 denotes an annular plate pin fixing body that is rotatably fitted to the inner peripheral surface of the upper disk 11. Each pin insertion hole 11
It has three pin holding holes 22 at positions matching with c. The pin holding hole 22 is the same as the pin insertion hole 11c.
The small hole portion 22a has a gourd shape including a large hole portion 22a through which 0 passes and a small hole portion 22b fitted in the circumferential groove 20b of the pin 20.
It has a wedge portion 22c around b.

As shown in FIG. 12, after the pin fixing body 21 is inserted between the upper and lower discs 11 and 12, the three pins 20 are respectively inserted into the pin insertion hole 12c of the lower disc 12 and the pin holding hole 22 of the pin fixing body 21. And the upper and lower disks 11 and 12 are fixed by the welding plate portions 11b and 12b. This is attached to the rotary shaft 16 of the power brush cutter by a holding plate 17 and a nut 18 as shown in FIG.

The rotary cutting blade is turned upside down, and the pin fixing body 21 is rotated to insert the pin 2 into the large hole portion 22a of the pin holding hole 22.
When 0 is aligned (this is referred to as the released position of the pin fixing body 21), each pin 20 is disengaged from the pin insertion hole 12c of the lower disc 12 as shown in FIG.
Since it hangs on one side, the elastic cord 15 which is folded into two by inserting it into the cord insertion hole 14 by utilizing the gap is shown in FIG.
Wrap in the opposite direction as shown in 0. Then, the pin fixing body 21 is rotated to rotate the pin holding hole 22 into the small hole portion 22b.
When the pin 20 is aligned with the pin 20 (this is referred to as the fixing position of the pin fixing body 21), the wedge portion 22c presses the pin 20 to fix the pin 20 between the upper and lower discs 11 and 12,
In the fixed state of the pin 20 (state of FIG. 11), both ends of the elastic cord 15 are locked to the pin 20 and project from the periphery of the disk body 9 by a predetermined length as shown in FIGS. In this way, both ends of the elastic cord 15 are locked to the pins 20 so that the disk body 9
When the elastic cord 15 is worn away from both ends in the state shown in FIGS. 7 and 8 in which the elastic cord 15 protrudes from the periphery of the pin 20 by a predetermined length, the elastic cord 15 is locked by the next pin 20 and protrudes again by the predetermined length. It can be used continuously. When the pin fixing body 21 is provided as in this embodiment, each pin 20 can be collectively moved to the fixed position and the release position by turning the pin fixing body 21, and can be held in each state collectively. So
Can be set quickly and easily. Further, similar to the first embodiment, when the elastic cord 15 is wound, the elastic cord 15 can be easily wound while the product is attached to the rotary shaft 16 of the brush cutter.

Example 3. In the above-mentioned Examples 1 and 2, pin 1
Although the three and 20 three and 20 are arranged at equal intervals, they may not be evenly arranged, and the number thereof may be four or other plural numbers.

[0020]

As described above, according to the first aspect of the present invention, it is not necessary to carry the elastic cord, and even if the elastic cord is worn, the elastic cord automatically projects and can be continuously used. .

Further, according to the invention of claim 2, there is an effect that a workable work can be obtained in which a plurality of pins can be fixed and released collectively.

[Brief description of drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 is a side view showing a state where the rotary shaft is mounted on a rotary shaft.

FIG. 3 is a side view showing a state in which a pin is released from FIG.

4 is a cross-sectional view taken along the line IV-IV in FIG.

5 is a cross-sectional view taken along the line VV of FIG.

6 is a cross-sectional view showing a state where the disc body of FIG. 5 is disassembled.

FIG. 7 is a plan view showing a second embodiment of the present invention.

FIG. 8 is a side view showing a state where the rotary shaft is mounted on the rotary shaft.

9 is a side view showing a state in which a pin is released from FIG. 8. FIG.

10 is a cross-sectional view taken along the line XX of FIG.

11 is a cross-sectional view taken along the line XI-XI of FIG.

FIG. 12 is a cross-sectional view showing a state where the disc body of FIG. 11 is disassembled.

FIG. 13 is a view taken along the line XIII-XIII in FIG.

14 is a cross-sectional view taken along the line XIV-XIV of FIG.

FIG. 15 is a bottom view showing a conventional one.

16 is a cross-sectional view taken along the line XVI-XVI of FIG.

[Explanation of symbols]

 9 disk body 10 orbiting concave portion 10a one side surface of the orbiting concave portion 10b other side surface of the orbiting concave portion 10c bottom surface of the orbiting concave portion 11 upper disc 12 lower disc 13 pin 15 elastic cord 16 rotating shaft 20 pin 21 pin fixed body

Claims (2)

[Claims] 1. A rotary shaft of a power brush cutter-a disk body that is detachably mounted, a circular recess provided on the outer periphery of the disk body and opening in the radial direction thereof, and a folded portion folded in two. Elastic cords wound in the circumferential recess in the counter-rotational direction of the disc body while being stopped at the bottom of the circumferential recess, and a plurality of elastic cords arranged in the circumferential direction of the disc body and on both sides of the circumferential recess. And a pin for moving to a release position separated from one side portion, and both ends of the elastic cord are locked to the pin so as to project from the periphery of the disk body for a predetermined length. A rotary cutting blade for a power brush cutter. 2. The pin fixing body for moving the pins together into the circular recess to a fixed position where the pins are fixed to the disc body and a release position where the pins are separated from one side portion. Rotating blade of the power brush cutter described.