JP2818744B2 - Cord length adjusting device for cord mower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mowing machine in which a cord made of a tough monofilament such as nylon is protruded from a head as a blade, and the head is rotated at a high speed to cut grass with the cord. The present invention relates to a cord length adjusting device capable of setting a projecting length of the cord to a required length.

[0002]

2. Description of the Related Art As this type of mower, Japanese Patent Laid-Open Publication No. Sho 59-2
No. 03428 (invention by the inventor), but as described particularly from the right column to the left column at the top of page 2 of the publication, the upper edge of the peripheral wall of the main body 1 (body) A long hole 5 provided in the flange portion 2a of the reel 2.
An appropriate number of locking claws 6 (the shape of which is shown in FIG. 8 attached to this document) are provided at equal intervals to protrude the cord. As described from the right column to the left column at the bottom of the page, the main body 1 and the reel 2 are separated from each other (the flange portion 2a of the reel 2).
When the reel 2 is turned in the direction of "out", the cord is loosened and can be pulled out with fingers. On the other hand, reel 2
Is turned in the “in” direction, the flange 2
A long hole 5 provided in a is detached upward from the locking claw 6, and only the reel 2 can be rotated in the winding direction, so that the cord can be wound by a length corresponding to the rotation amount of the reel 2. is there.

[0003]

By the way, when mowing the grass with this kind of mower, the length of the cord protruding from the head is related to the size of the main body. It is preferable to project from about 16 to 22 cm when measured from above, and if the length is too short or too long, the sharpness of the grass decreases. Therefore, the length of the cord is appropriately adjusted and used. However, the cord protruding in the meantime is worn and worn, and the mowing ability is reduced. Therefore, it is necessary to draw the cord from the reel. In this case, if it is a conventional one, pull up the reel so as to separate it from the main body, remove the locking claw from the long hole of the reel, and turn the reel in the "out" direction in that state,
Since the lifting operation and the rotation operation are performed simultaneously by hand,
When pulling out for a long time, it is necessary to repeat the operation many times. In addition, since the cord has a winding habit, even if the reel is rotated in the "out" direction, the cord simply loosens in the reel and does not protrude according to the rotation. However, at this time, the reel is unnecessarily pulled out, or the reel is short, so that it is necessary to repeat the operation of rotating the reel again, and there is a problem that the operation of pulling out the reel to a required length is troublesome.

[0004] In view of the above, the present invention eliminates the conventional locking claws, allows rotation by one pitch by simply rotating the reel, and allows the cord to be easily protruded by a simple operation by a simple operation. It is to improve so that it can be pulled out one by one.

[0005]

Means for Solving the Problems A solution of the present invention is to provide a clutch function for rotating the reel together with the rotation of the body between the outer peripheral surface of the upright shaft provided in the body and the inner peripheral surface of the reel. With the rotation of only the reel with the body fixed, a clutch transmission function is provided, and a rotation transmission means having a step feed function capable of intermittently feeding the reel is interposed, and the rotation transmission means is interposed. A plurality of recesses into which the entire steel ball fits are provided at equal intervals on the outer peripheral surface of the standing shaft provided in the body, and only half or less of the steel ball fits on the inner peripheral surface of the reel facing the outer peripheral surface of the standing shaft. When the recesses are at least as many as the recesses of the upright shaft and the two recesses face each other, the two recesses are provided so as to be continuous in a long hole shape, and a spring that urges the steel ball toward the reel from the recess side of the upright shaft. It is characterized by having been provided.

[0006]

When the head is rotated with the rotation drive shaft attached to the main body, the reel rotates together with the body in the same direction via the rotation transmitting means, and the grass is cut with a cord projecting from the body during the rotation. On the other hand, when the body of the head is fixed by hand and the reel is rotated to one side, the steel ball is retracted into the recess on the body side, so that only the reel can be rotated, and the recess on the reel side is next to the body side. When facing the recess, the steel ball enters the recess on the reel side by a spring into the recess, and the rotation is stopped. However, the reel can be further rotated in the same direction. Therefore, depending on the direction in which the reel rotates, one of the cords is fed out and the other is wound up, and the operation is performed one pitch at a time in each recess, so that the amount of projection of the cords from the body is reliably adjusted to a predetermined amount. Is what you can do.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of the present invention, an upright shaft is provided in a cylindrical body constituting a head, and a reel around which a cord is wound is provided in this body so as to be rotatable about the upright shaft. The cord unwound from the reel is guided out of a window opened in the peripheral wall of the body, guided to the back side of the body, and projected out of the head through between eyelets provided on the back side of the body.

A rotation transmitting means is interposed between a standing shaft of the body and a reel fitted thereto, and the rotation transmitting means is driven at a high speed by a rotation driving shaft connected to the standing shaft of the body. By doing so, the clutch function to rotate the reels together in the same direction, and when the reel is rotated to the left or right while the body is fixed by hand by stopping rotation by the rotation drive shaft, the clutch function is disengaged, Only the reel is provided with a step feed function that is intermittently rotated at intervals of one pitch, equally divided in the circumferential direction.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described by way of an embodiment. As shown in an exploded perspective view of FIG.
It is assembled by a ring 3, a reel 4, a body 5, a guide plate 6 having an eyelet 7, and a cover 8,
The outline of the structure of each of these members will be described with reference to the drawings. The cover 8 is made of metal, and the other members are made of synthetic resin.

The cord 1 is made of a nylon filament and has a diameter of about 3.5 mm.
Is wrapped around.

The reel 4 has flanges 10 at both ends of the body 9, a bearing hole 11 at the center of the body 9, and a stop hole 12 for inserting the tip of the cord 1 into the outer peripheral surface of the body 9 and stopping it.
The ring 3 is integrally attached to the outer periphery of the upper flange 10 by engagement with a plurality of claws 13. An anti-slip notch is engraved on the outer periphery of the ring 3.

The body 5 has a cylindrical portion 15 into which the reel 4 is fitted on the upper surface of the disk 14, and an upright shaft 16 integral with the disk 14 is provided at the center of the cylindrical portion 15, and the upright shaft 16 is mounted on the top wall. And has a through-hole 17 in the top wall. Further, a portion of the outer peripheral wall of the cylindrical portion 15 has a window 18 for guiding the cord 1 drawn out from the reel 4, and a hole 14 is provided in the disk 14 so as to be close to the window 18 and pass the cord 1 to the back side. I have. The through hole 17 is a hole for passing a bolt, and connects the body 5 to the rotary drive shaft 21 (see FIG. 1) provided in a handle 20 (see FIG. 7) of the mower by bolts.

To fit the reel 4 into the body 5,
The reel 4 is fitted by being inserted into the cylindrical portion 15 of the body 5 while fitting the bearing hole 11 of the reel 4 into the upright shaft 16, and can be rotated about the upright shaft 16. After the reel 4 is placed in this manner, the ring 3 is attached to the upper flange 1 of the reel.
0, which is attached by the engagement of the claw pieces 13. The attached ring 3 covers the open rim of the cylindrical portion 15 of the body 5,
It is provided so as to protrude from the outer periphery of the cylindrical portion 15,
By turning the ring 3, the reel 4 can be integrally rotated.

The cap 2 is formed of a disk having a size that fits in the ring 4 and is fixed to the upper surface of the upright shaft 16 of the body with a screw 22. A through hole 23 for passing the through hole 21 is provided.

Next, the guide disk 6 is provided with a disk 14 of the body.
A pair of rollers 24 are fixedly attached to the upper surface of a smaller disk with an interval therebetween, and the gap is defined by the eyelet 7 through which the cord 1 is inserted.
It is assumed that. Further, a guide column 25 for guiding the cord 1 to the outer peripheral surface of the roller 24 is protrudingly provided. The guide plate 6 is fixed to the back surface of the body 5 by bolts.

The cover 8 is made of metal and formed in a deep dish shape, and is fixed to the back surface of the guide plate 6 by bolts.

As described above, when the cord 1 is newly wound around the reel 3, it is not necessary to disassemble the head members.
After passing between the guide post 25 and the guide post 25, it is pulled out to the front side of the body 5 through a hole 19 formed in the disk 14 of the body, enters through the window 18 opened in the cylindrical portion 15 of the body, and is provided on the body 9 of the reel. The cord 1 can be wound around the reel 4 by inserting the cord 1 into the stop hole 12 and rotating the reel through the ring 3 as it is, and as shown in FIG. It is used by protruding by the length.

As described above, when the cord 1 is used by projecting by a predetermined length, and the cord 1 is worn and shortened during use, it is necessary to rewind the cord 1 from the reel 4.
At this time, the reel 4 can be freely and bidirectionally rotated in a relationship with the body 5, while the reel 4 needs to be rotated in the same direction together with the body 5 during actual mowing. The subject of the present invention is to provide a configuration in which such an operation is performed, and a rotation transmitting means having a clutch function and a function of intermittently feeding between the upright shaft 16 and the reel 4 of the body. 26.

As shown in FIG. 1, the rotation transmitting means 26 is integrally provided with a support cylinder 27 having a diameter larger than the diameter of the upright shaft 16 of the body on the upper flange 10 of the reel. A plurality of recesses 28 are provided at regular intervals along the peripheral surface, and steel balls 29 are fitted into each recess 28. The size of the recesses 28 is set to a size that fits no more than half of the steel balls 29. It is formed.

On the other hand, in the upper part of the outer peripheral surface of the upright shaft 16 of the body, similarly, recesses 30 are provided in the same number or less than the number of the recesses 28 of the reel, and about half of the steel balls 29 fit. A spring 31 is provided in every other concave portion 28 to urge the steel ball 29 toward the support cylinder 27. The springs 31 are not limited to every other one, and at least one of the steel balls 29 is provided.
It may be provided on each steel ball 29 or on all the steel balls 29 to urge them.

Further, the cap 2 fixed to the upright shaft 16 leaves another portion of the space between the outer peripheral surface of the upright shaft 16 and the inner peripheral surface of the support cylinder 27 facing the recess 30 on the upright shaft side. A protrusion 32 is provided to fill the space between all parts.
When the reel 4 is rotated and the recess 28 faces the recess 30 of the upright shaft, both the recesses 28 and 30 and the left and right protrusions 32
It has the shape of a long hole surrounded by.

In the above-described structure, since the upright shaft 16 is formed of a cylindrical body as described above, a deep recess 30 cannot be provided. 32, the connecting means for connecting the upright shaft 16 and the rotary drive shaft 21 of the mower has another structure, and the upright shaft 16 is formed with a recess 30 having a size in which the steel ball 29 can be completely contained. If the thickness is as large as possible, the rotation transmitting means 26 having the structure shown in FIG. 3 can be incorporated.

That is, the upper flange 10 of the reel 4 is formed along the outer peripheral surface of the upright shaft 16, and the flange 10
As described above, a recess 28 is directly provided with a size that fits only half or less of the steel ball 29 in the same manner as described above.
0 is provided in such a size that the steel ball 29 is completely embedded. Also in this case, when the concave portions 28 and 30 face each other, the concave portions 2
A long hole is provided by 8,30.

As shown in FIG. 4, a two-way arrow 33 is displayed on the upper surface of the cap 2 and the characters "in" are displayed on one side and "out" on the other side. Is instructed.

With the above structure, when the head is rotated by the rotary drive shaft 21, centrifugal force is applied to each steel ball 29, so that the steel ball 29 is engaged with the concave portion 28 of the reel 4 and the clutch is connected. The body 5 and the reel 4 are integrally rotated in the same direction. In this case, centrifugal force is also applied to the cord protruding from the head, but the amount of protrusion is not changed, and the cord rotates while maintaining a certain length.

The grass is cut by the high-speed rotation of the protruding cord as described above. However, the cord is worn or damaged during use, and the cutting ability is reduced. Therefore, the worn portion is cut and a new reel is cut. 4 can be used by pulling it out.

When pulling out the cord 1 from the reel 4, the body 5 may be supported with one hand and the ring 3 may be rotated in the "out" direction with the other hand. At this time, since the rotating force is applied from the reel 4 and the body 5 is in a fixed state, each steel ball 29 is pushed out from the concave portion 28 of the reel with the rotation of the reel 4 and the inside of the concave portion 30 of the upright shaft. And the clutch is disengaged, and only the reel 4 rotates in the rotation direction. However, when the recess 28 of the reel faces the recess 30 of the next standing shaft, the steel ball 29 urged by the spring 31 enters the recess 28 of the reel,
At the same time, the rotation of the reel is temporarily stopped. In this case, if the reel is strongly rotated in the same direction, the reel is further rotated. Therefore, the pitch between the adjacent concave portions 28, 28 is one pitch, and the pitch is drawn in units of the length of one pitch. For example, if the length of one pitch is 3 cm, the projection is 6 cm by rotating two pitches. Can be done. Even if the reel 4 is rotated as described above, since the cord 1 has a winding habit, the cord is only loosened from the reel 4 and the cord is not actually drawn out. Can be pulled out.

Next, when the cord 1 is to be wound, the body 5 is supported with one hand and the ring 3 is rotated in the "in" direction with the other hand as described above. In this case, it is visibly rolled up by one pitch, and its rotating operation is the same as that of the above-mentioned "out".

[0029]

According to the cord length adjusting device for a cord-type mower according to the present invention, by fixing the body and rotating the reel to the left or right, the clutch function and the notch feed function provided between the body and the reel are achieved. The clutch can be disengaged and rotated at intervals of one pitch by the rotation transmitting means having the function of (1). If the rotation direction is the direction in which the cord wound on the reel is rewound, the cord has a length corresponding to one pitch. The length of the cord protruding from the head can be reliably set to an appropriate length for use.

If the rotation transmitting means is constituted by a concave portion, a steel ball and a spring, the clutch function and the notch feeding function during bidirectional rotation can be reliably obtained, and the clutch works when the mowing operation is performed. It does not protrude and operates without any abnormality at high speed rotation.

[Brief description of the drawings]

FIG. 1 is a plan view showing a cord length adjusting device of a cord type mower according to the present invention.

FIG. 2 is a rear view of a cover.

FIG. 3 is a plan view showing another example of the cord length adjusting device of the cord type mower according to the present invention.

FIG. 4 is a plan view of a cover.

FIG. 5 is an exploded perspective view showing members constituting the head.

FIG. 6 is an exploded front view showing members constituting the head in a disassembled state.

FIG. 7 is a front view showing a state in which a head is attached to a handle of the mower.

FIG. 8 is a schematic diagram showing the shape of a locking claw disclosed in Japanese Patent Application Laid-Open No. Sho 59-203428 by a line.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Code 4 Reel 5 Body 7 Eyelet 16 Standing shaft 21 Rotation drive shaft 26 Rotation transmitting means 28 Depression provided on reel 29 Steel ball 30 Depression provided on standing shaft 31 Spring

Claims (1)

(57) [Claims] 1. A reel (4) around which a cord (1) serving as a mowing blade is rotatably provided in a body (5) constituting a head rotated by a rotary drive shaft (21),
The cord (1) is led out of the peripheral wall of the body (5), and the cord-type mower protrudes through an eyelet (7) provided on the back of the body. A clutch function for rotating the reel (4) together with the rotation of the body (5) between the outer peripheral surface and the inner peripheral surface of the reel (4), and rotation of only the reel (4) with the body (5) fixed. Accordingly, a rotation transmitting means (26) having a notch feeding function capable of intermittently feeding the reel (4) in two directions by disengaging the clutch function is interposed, and the rotation transmitting means (26) A plurality of recesses (30) into which the entire steel ball (29) fits are provided at equal intervals on the outer peripheral surface of the upright shaft (16) provided in the body (5), and face the outer peripheral surface of the upright shaft (16). The steel ball (29) is provided on the inner peripheral surface of the reel (4).
The recess (28) into which only half or less of the
6) At least as many recesses (30) as the two recesses (28,
A spring (31) is provided in the recesses (30) so as to be continuous with the steel balls (29) toward the reel (4) from the recess (30) side of the upright shaft when the recesses (30) face each other. A cord length adjusting device for a cord-type mower, which is attached.