JP2002272236A - Rotary blade device for mower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary blade device for a mower preventing scatter of a stone and a tree stump, damaging a prop and breaking the blade body or the like when the rotary blades get contacted with the stone, the tree stump or the prop of a fence or the like. SOLUTION: This mowing rotary blade device comprises a rotary disk 1 rotary driven on the end of an operating rod P of a mower body, rotary blade mounting parts 10 installed on a peripheral side of the rotary disk 1 and rotary blades 20 made of a rigid material detachably and swingably mounted on the rotary blade mounting parts 10 and radially arranged on the peripheral part of the rotary disk 1. The rotary blade mounting part 10 comprises a movably and swingably engaged engaging part 24 of the rotary blade 20 on a mounting hole 32 formed on a mounting frame 31 installed on the bottom face of the rotary disk 1 and installing an elastically energizing means 35 in the mounting frame 31 elastically energizing the rotary blade 20 to protrude to the outside of the mounting frame 31. The elastically energizing means 35 comprises a circular spring material installed inside of the mounting body 31 by contacting the rear end of the engaging part 24 of the rotary blades 24 to the outside face, and the mounting hole 32 is perforated as long in right and left direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary blade for a revolving blade-type mowing machine which can be used for a hand-held or self-propelled medium-sized or large-sized mower or the like. It concerns the device.

[0002]

2. Description of the Related Art Conventionally, as a rotary blade for a medium-sized or large-sized mower such as a hand-operated type or a self-propelled type, to prevent stones, tree stumps and the like on a mowing surface which may be generated during mowing work, for example, a real blade is used. As disclosed in Japanese Unexamined Patent Publication No. Hei 6-23417, a body frame detachable from a drive shaft of a mower main body and a chain, chain or wires detachably connected to the body frame are used. There has been proposed one comprising a plurality of flexible blades formed so as to turn around.

[0003]

However, such a conventional rotary blade for a mower is a flexible blade for preventing scattering of stones and tree stumps. In this case, the rotational moment of the flexible blade itself is very weak, and the flexible blade is bent in a spiral curved shape on the rotating surface, so that the mowing strength is rather reduced. In addition, when a chain or chain is used as a flexible blade, the chain or chain itself is twisted, so that it becomes entangled with the grass to be mowed, not only causing a problem in the rotation state but also damaging the flexible blade itself. There was a problem that there was a fear.

Accordingly, the present invention has been made in view of the above-mentioned various circumstances, and improves the mowing strength by improving the rotational moment of the revolving blade body itself radially disposed around the rotating turntable. Even if the revolving blade hits a pillar such as a stone, a tree or a fence, etc., the stone or tree will be scattered, the pillar will be damaged, and the revolving blade itself will be broken. It is an object of the present invention to provide a rotary blade device for a mower that can prevent damage such as settling and the like beforehand, and can easily replace the revolving blade itself.

[0005]

According to the present invention, there is provided a rotary disk 1 which is driven to rotate by a tip end of an operating rod P of a mowing machine, and a peripheral portion of the rotary disk 1 in the present invention. Revolving blade body mounting portion 10 provided on the
And a revolving blade 20 made of a rigid material, which is suspended and held removably on the opposite side to the revolving direction of the revolving disk 1 and arranged radially on the periphery of the revolving disk 1. . The revolving blade body mounting portion 10 is provided with a frame 11 formed on the bottom surface of the flat rotating disk 1, a mounting groove 12 cut out from a lower end edge of the frame 11, and a rear end engaging portion 2 of the revolving blade body 20.
4 and a lid 16 for closing the opening edge of the mounting groove 12 is formed on the periphery, and a predetermined gap is formed inside the frame 11 with the frame 11 so that And a bottomed tubular support plate 15 fixed to the support plate. Alternatively, the revolving blade body mounting portion 10 is formed in the recessed peripheral wall portion of the recessed portion 18 formed in the turntable 1, the mounting groove 12 cut out from the bottom wall peripheral edge to the concaved peripheral wall of the recessed portion 18, the rear end of the revolving blade body 20. And a closing plate 19 that closes an opening edge portion of the mounting groove 12 on the bottom wall side is fixed to the rotating disk 1. Alternatively, the revolving blade body mounting portion 10 is provided with a mounting frame 5 formed at a position inside the periphery of the turntable 1.
For example, the revolving blade body 20 is suspended via the hook means 7 so that the revolving blade body 20 can be detachably attached to the revolving blade body mounting holes 6 arranged in the mounting frame 5 itself and retracted to the opposite side to the revolving direction of the turntable 1. It is made by wearing. Alternatively, the revolving blade body mounting portion 10 engages the engaging portion 24 at the rear end of the revolving blade body 20 with a mounting hole 32 formed in a mounting frame 31 provided on the bottom surface of the rotating disk 1 so as to be able to advance and retreat and swing freely. Together with
The mounting frame 31 is provided with a resilient means 35 for resiliently urging the revolving blade body 20 to protrude outward from the mounting frame 31, and the resilient means 35 engages with the revolving blade body 20. Part 2
4 The rear end is formed of a frame-shaped spring material abutted on the outer side surface and disposed in the mounting frame 31, and the mounting hole 32 can be formed by long perforation to the left and right. The revolving blade body 20 includes a blade portion 21 having a blade having a predetermined shape, a shaft portion 23 that fits into the mounting groove 12 or the mounting hole of the revolving blade body mounting portion 10 with play, and a mounting portion. It is arranged on the inner side of the turntable 1 from the groove 12 or the mounting hole,
And an engaging portion 24 that engages with the mounting groove 12 or the edge of the mounting hole. The blade portion 21 may be formed to have a polygonal shape in a cross section having a curved surface or a flat surface having an acute-angled apex serving as a blade edge.

[0006] In the rotary blade device for a mower according to the present invention configured as described above, the revolving blade body 20 rotated by the rotational drive of the rotary disk 1 is rotated by the centrifugal force generated by the rotating operation thereof. While being horizontally extended along the radial direction of the disk 1, the disk 1 is rotated and rotated in parallel with the rotating surface of the rotary disk 1. The engaging portion 24 provided at the rear end of the revolving blade body 20 engages with the mounting groove 12 of the revolving blade body mounting portion 10 to suspend and hold the revolving blade body 20 itself, and the rotating disk 1 When the rotary blade 20 is driven to rotate, the rotary blade 20 is rotated and floated so as to be horizontally extended in the radial direction of the turntable 1 by the centrifugal force generated in the rotary blade 20 itself. Let it. At this time, the engaging portion 24 is engaged with the mounting groove 12 of the revolving blade body mounting portion 10 located inside the peripheral portion of the rotating disk 1, and revolves the revolving blade body mounting portion 10 itself rotating together with the rotating disk 1. The turning blade 20 is made of a rigid material and is not exposed outside the periphery of the turntable 1.
To efficiently cut grass and the like, and do not entangle the root portion of the revolving blade body 20 with the grass and the like to be cut. The blade 21 having an acute-angled top in the revolving blade 20 made of a rigid material allows mowing by the rotating moment of the revolving blade 20 itself, and the blade 21 of the revolving blade 20 is used for cutting a stone, a tree or a fence. When it hits the support column, it is engaged with the mounting groove 12 of the revolving blade body mounting portion 10 through the shaft portion 23 with play, so that the revolving blade body made of a rigid material is formed at the engaging portion. The danger 20 is caused to escape and retreat in the direction opposite to the rotational turning direction of the turntable 1, thereby eliminating danger. The resilient action of the resilient means 35 resiliently urges the revolving blade body 20 engaged with the mounting frame 31 by the engaging portion 24 so as to protrude outward, and revolves the revolving blade body 20 to the mounting frame 31. In contrast, the cutting action when cutting grass and the like is enhanced by maintaining the state substantially parallel to the turntable 1 and making it substantially orthogonal. In addition, not only does the retraction and avoidance of the revolving blade body 20 when it hits various obstacles occur, but also the speed of return to the original position after retreating, rocking, etc., is expedited.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. Reference numeral 1 shown in the drawings denotes a rotary-driven rotary plate, which is used for, for example, a shoulder type hand-held mower and the like. As shown in FIG. 1, a rotary blade device for a mowing machine of a revolving blade body suspension type is operated by a prime mover M such as an engine or an electric motor which is mounted in a casing at a rear end of an operating rod P of a mower main body. Rod P
Is rotated via a drive shaft (not shown) or the like as a drive connection member at the tip of the drive shaft.
The rotating disk 1 is provided with a rotating blade body mounting portion 10 on the peripheral edge side thereof. The rotating blade body mounting portion 10 is detachably attached to the rotating blade body mounting portion 10 and retracted to the opposite side to the rotating direction of the rotating disk 1. A plurality of revolving blade bodies 20 made of a rigid material are suspended and held by being radially arranged on the periphery of the turntable 1 so as to be possible. A grip handle Q for gripping the mower main body with both hands at the time of mowing is attached to the side of the operating rod P closer to the prime mover M.

The rotary disk 1 itself is operated by screwing together with a support disk 15 or a closing disk 19 which will be described later, after fitting the rotary disk 1 to a rotary shaft of a drive connecting member provided at the tip of the operating rod P as shown in FIG. It is fixed to the tip of the rod P.

The revolving blade body mounting portion 10 supports the revolving blade body 20 in a suspended manner, and a slight play is set at the supporting portion so that the revolving blade body 2 is rotated by the centrifugal force during rotation of the turntable 1.
0 is extended outward, and when it is not rotating, it hangs down along the direction of gravity. 1 to 3 form a frame 11 on the bottom surface of the flat-plate-shaped rotary disk 1 at a position closer to the center side from the periphery of the rotary disk 1. A donut shape is formed so that a later-described engaging portion 24 of the revolving blade body 20 is engaged with a U-shaped mounting groove 12 cut out from a lower end edge, and an opening edge of the mounting groove 12 is closed. A lid 16 is formed on the periphery, and a predetermined gap is formed between the inner wall of the frame 11 and the peripheral wall of the frame 11, that is, a bottomed cylindrical shape that forms a space for the engaging portion 24 to move forward and backward and fall down. It has a support plate 15 that is screwed to the turntable 1 after being fitted to the rotary shaft.

The width of the inner edge of the mounting groove 12 is larger than the diameter of a shaft portion 23 (described later) of the turning blade body 20 and smaller than the diameter of the engaging portion 24. Even if the body 20 can be inserted directly,
Is not possible at all after the closure by the lid 16. The engaging portion 24 of the revolving blade body 20 locked in the mounting groove 12 is accommodated in the gap between the outer peripheral surface of the cylindrical portion of the support board 15 and the inner peripheral surface of the frame body 11 with play provided. Sliding in the radial direction, swinging of the turning blade body 20 along the vertical direction of the frame body 11, swinging of the turning blade body 20 itself along the circumferential direction of the frame body 11, and the like can be arbitrarily performed. (See FIG. 2). Note that reference numeral 1 in FIG.
Reference numeral 7 denotes a connecting portion which is screwed 2 by abutting on the bottom side surface of the turntable 1 in the support board 15.
The distance / spacing from the top to the lid 16 substantially corresponds to the height of the frame 11.

The turning blade mounting portion 10 shown in FIG.
The U-shaped mounting groove 12 cut out from the bottom wall peripheral edge to the concave peripheral wall of the concave part 18 in the concave part 18 formed in the center part of the turntable 1 is formed at the rear of the turning blade body 20. A flat closing plate 19 for closing the opening edge portion of the mounting groove 12 on the bottom wall side is fitted on the rotating shaft, and the outer circumferential surface of the bottom wall is brought into contact with the engaging portion 24 at the end. After contact, screw 2 to turntable 1
It is fixed. Also in this example, the depression 1
8, the engaging portion 24 of the revolving blade body 20 locked in the mounting groove 12 is accommodated in the gap between the inner peripheral surface of the recessed peripheral wall and the outer peripheral surface of the drive connection member or the rotary shaft thereof, with play provided. 2
3, the swinging of the turning blade 20 itself along the vertical direction of the recess 18 and the swing of the turning blade 20 itself along the circumferential direction of the recess 18 are arbitrary. I can do it.

As shown in FIG. 5, the revolving blade body 20 is preferably made of a material having a high hardness, such as a cemented carbide material. An intermediate portion 22 having, for example, a circular shape in a cross section that is larger in outer shape than the blade portion 21 and is continuous with the blade portion 21;
A shaft portion 23 which is fitted into the mounting groove 12 continuously with play in the intermediate portion 22;
Engaging portion 2 which is arranged on the inner side of the
4 is provided. That is, the length of the shaft portion 23 itself is longer than the thickness of the frame 11 itself or the peripheral wall of the recessed portion 18 of the revolving blade mounting portion 10, and the shaft portion 23 fits into the mounting groove 12. In the retracted state, the revolving blade body 20 can move forward and backward and swing freely at the position of the mounting groove 12. Then, due to the centrifugal force at the time of rotation of the turntable 1, the revolving blade body 20 extends outward in a state where the engaging portion 24 is engaged with the edge of the mounting groove 12, and during the revolving revolution, for example, a stone, a tree stump, etc. When the revolving blade 20 hits some obstacle, the revolving blade 20 is freely swung so that the shaft portion 23 falls in the retreating direction.

The shape of the blade portion 21 will be described by way of example. In FIG. 5 (A), for example, an acute angle at which three rectangular side surfaces having a vertical length of about 7 mm and a horizontal length of about 30 mm intersects each other. It is formed in a triangular prism shape having a length of about 30 mm with the top edge as a blade. In FIG. 5 (B), for example, a vertical length of about 6 mm and a horizontal length of about 30 mm are protruded from both sides in a triangular mountain shape, and the length of the triangular mountain portion is set to be a sharp edge as a cutting edge. It is formed in a substantially vertically or horizontally long hexagonal shape in the entire cross section of about 30 mm. In FIG. 5 (C), for example, four sides of a rectangular shape having a vertical length of about 4 mm and a horizontal length of about 30 mm have two acute and obtuse portions each intersecting with each other. The length of the blade is about 30
It is formed in a rhombic cross section of about mm. In FIG. 5 (D), for example, a sharp edge having a peripheral surface length of about 9 mm and a lateral length of about 30 mm, which is an intersection of two curved peripheral sides, is used as a cutting edge, and the length is about 30 mm. The cross section has a convex lens shape.

In any case, the shape, structure and the like of the blade portion 21 are not particularly limited.
When turning by the rotation of the turntable 1 in a state of being connected to the blade, the blade portion 21 should be able to cut and cut them when hitting grass or the like by turning and running on the grass cutting surface. It is.

In another embodiment shown in FIG. 6, the revolving blade body 20 is formed in a triangular prism shape, and a triangular surface portion on one end side of the triangular prism is formed from a peripheral portion of the flat rotating disk 1. A hook means 7 is provided, for example, with an annular hook head having a length of about 20 mm so as to be hooked on a revolving blade body mounting hole 6 which is opened and arranged in a circular frame-shaped mounting frame 5 formed at a position on the inside. A screw nail or the like having a screw shaft portion is screwed in, and if necessary, an adhesive is applied to the screwed portion to fix the screw nail. That is, the turning blade body mounting portion 10 is formed so that the turning blade body 20 is hung via the hook means 7 to the mounting frame 5 in which the turning blade body mounting holes 6 are opened and arranged. The hook means 7 itself is configured to be swingable, so that the swinging blade body 20 can swing backward so as to retreat backward when it comes into contact with a stone, a tree stump or other hard obstacle. Therefore, damage to the revolving blade body 20 itself, and furthermore, obstacles and the like can be more effectively prevented, and scattering of the obstacles and the like can also be prevented.

In the other embodiment, the swingable hook means 7 employs a screw nail or the like having an annular hook head and a screw shaft portion. In addition, for example, a pin joint mechanism or the like is used. Naturally, the rotary blade for a mower in the present embodiment may be applied to a medium- or large-sized mower such as a hand-operated type or a self-propelled type.

Next, an example of use and operation of the embodiment configured as described above will be described. At the time of mowing work, the grip handle Q is gripped with both hands, and the prime mover M
To rotate the turntable 1 at the tip of the operating rod P. By this rotation drive, the revolving blade body 20 suspended on the revolving blade body mounting portion 10 revolves and rotates together with the rotating disk 1, and the revolving blade body 20 itself is rotated by centrifugal force generated by the revolving rotation. Is swiveled and floated so as to be horizontally stretched along the radial direction of. At this time, the mounting groove 12 of the revolving blade body mounting portion 10 is, as shown in FIG.
Frame 1 rotating with the turntable 1
1. The grass is not caught in the depressions 18 and the like, and the turning operation is smoothly continued. Further, even if the mowing surface is inclined, the swing blade body 20 can be moved along the inclined surface without inclining the turntable 1 by using the swingability of the shaft portion 23.
Can be turned.

Thus, mowing is performed by generating a rotational moment in the turning blade body 20 itself. At this time, when the blade portion 21 of the revolving blade body 20 hits a pillar such as a stone, a tree, a fence, or the like, the revolving blade body 20 itself is swung by merely engaging with the mounting groove 12 and swinging. Is retracted in the direction opposite to the turning direction of the turning blade body.
It does not break itself.

When the turning blade 20 is replaced, the screw 2 is removed from the turning blade mounting portion 10 of the turntable 1 to remove the support plate 15 or the closing plate 19, and the turning groove 12 is removed from the open mounting groove 12. The old revolving blade 20 may be removed, and the new revolving blade 20 may be fitted and attached thereto. In addition, when the mowing machine body is not used, the turntable 1
The swivel blade 20 can be completely removed from the swivel blade mounting portion 10, and can be stored compactly.

In the present embodiment, a structure is adopted in which a total of four revolving blades 20 are mounted at 90 ° intervals on the peripheral side surface of the revolving blade mounting portion 10 of the turntable 1. However, although not shown in the drawings as other configurations, a structure in which two, three, or even five or more revolving blade bodies 20 are arranged at equal angular intervals around the periphery of the revolving blade body mounting portion 10 is adopted. Is also possible.

FIGS. 7 to 10 show still another embodiment. That is, in this embodiment, the turning blade body mounting portion 10 is engaged with the mounting hole 32 formed in the mounting frame 31 provided on the bottom surface of the turntable 1 with the engaging portion 24 at the rear end of the turning blade body 20. And the resilient means 35 for resiliently urging the revolving blade body 20 to project outward of the mounting frame 31 while allowing the revolving blade body 20 to reciprocate and swing freely. 31. The reference numeral 33 in the drawing denotes a washer interposed between the edge of the mounting hole 32 and the peripheral edge of the engaging portion 24.
It is.

The mounting frame 31 is provided, for example, on the bottom surface of the rotating disk 1 by being integrally formed with the rotating disk 1 in a frame shape, for example, at a position inside the outer periphery of the rotating disk 1 (FIG. 9)
(A)). A substantially hat-shaped mounting plate 34 having a cross section including an inner wall portion adapted to be fitted to the rotating shaft together with the rotating plate 1 fitted to the rotating shaft of the drive linking member at the tip of the operating rod P, to the inside of the mounting frame 31. That is, a predetermined gap is formed between the inner peripheral surface of the inner wall portion of the mounting plate 34 and the inner peripheral surface of the mounting frame 31, and the space is screwed 2 to the rotating disk 1. The mounting hole 32 is formed so that when the revolving blade body 20 is urged to project outward from the mounting frame 31 by the resilient means 35, the revolving blade 20 can swing right and left in the rotational turning direction of the turntable 1. It is formed in an oval or elliptical shape elongated in the direction (see FIG. 9B).

As shown in FIG. 8, the resilient means 35 has the rear end of the engaging portion 24 of the revolving blade body 20 in contact with the outer side surface.
1 is formed of a frame-shaped spring material, and has a donut shape on a plane at a predetermined interval formed between the outer peripheral surface of the inner wall portion of the mounting plate 34 and the inner peripheral surface of the mounting frame 31. The revolving blade body 20 is disposed in the gap, and makes the revolving blade body 20 protrude outward from the mounting frame 31 by the outward resilient biasing action of the resilient means 35 itself. At the time of this projection, the resilient means 35 makes the revolving blade body 20 substantially perpendicular to the mounting frame 31 along the radiation of the turntable 1 by abutting against the flat rear end surface of the engaging portion 24. The turning blade body 20 faces the grass and the like. Further, in the case of hitting any obstacle during the turning, the resilient means 35 bends inward and outward of the mounting frame 31 due to the resistance and swings in the left and right direction of the mounting hole 32, and after the forward and backward swinging. In the embodiment, the spring means 35 returns to the original position by the restoring operation.

The resilient means 35 shown in the figure is formed in a circular frame shape so as to simultaneously repel a plurality of the revolving blades 20. It is also possible to dispose an appropriate spring material corresponding to each of the turning blades 20 so as to impart independent elastic force to the turning blades 20.

As shown in FIG. 10, the revolving blade body 20 itself has a substantially triangular cross section, a flat hexagonal shape, and a cross section similar to those shown in FIGS. 5 (A) to 5 (D). The shaft portion 23 is formed in a rhombic shape, a convex lens shape, or the like, and is successively connected to the blade portion 21. The shaft portion 23 has a substantially circular cross section to fit into the mounting hole 32, and the mounting hole 3 together with the washer 33.
The engaging portion 2 having a larger diameter than the diameter of the mounting hole 32 so as to engage with the two edges.
4 is provided. The length of the blade portion 21 is, for example, about 35 mm, and the length of the shaft portion 23 is, for example, about 25 mm. However, these lengths are not particularly limited. Note that the shaft portion 23 itself according to this embodiment has a cross-sectional shape that is formed long in the left and right direction so as to correspond to the mounting hole 32 that is long in the left and right direction, so that the cutting edge position of the blade portion 21 with respect to grass or the like is always maintained. It can be fixed.

According to this embodiment, when the turning blade 20 turns with the rotation of the turntable 1, the resilient means 35 is used.
The revolving blade body 20 is substantially parallel to the turntable 1 due to the repulsive action of
By being substantially orthogonal to 1, the mowing action on grass and the like is improved. Not only that, when it hits a stone, tree, or other obstacle, the turning blade 20 can be slightly returned in the direction opposite to the turning direction, making it difficult for stones and the like to scatter, making the work safer and more efficient. Etc. can be further improved.

[0027]

Since the present invention is constructed as described above, the turning moment of the turning blade body 20 which turns around the turntable 1 with the rotation of the turntable 1 is improved to cut the mowing on the mowing surface. Work can be performed efficiently, and even if the turning blade 20 hits a strut such as a stone, a tree or a fence, the stone or the tree will be scattered, the strut will be damaged, or the turning blade 20 will be damaged.
Damage such as breakage of the rotating blade itself can be prevented, and the revolving blade body 20 itself can be easily replaced.

That is, according to the present invention, the turning blade 1 is provided on the periphery of the rotating disk 1 which is driven to rotate by the tip of the operating rod P of the mower main body. Further, the turning blade body 20 is suspended and held so as to be retractable to the opposite side to the turning direction of the turntable 1, and the turning blade bodies 20 are radially arranged on the periphery of the turntable 1, thereby providing rigidity. Stones during mowing work with the turning blade 20 made of material,
It is possible to prevent the danger associated with the scattering of the tree stock and the like, damage to the strut and the like, and the turning blade body 20 itself.
Maintenance such as replacement and maintenance of 0 can be easily performed.

The turning blade body mounting portion 10 has a shaft portion 23 that allows a rear end engaging portion 24 of the turning blade body 20 to play with a shaft portion 23 in a mounting groove 12 formed by cutting out a peripheral wall portion of the recess in the frame body 11 or the recess portion 18. In a certain state, and the opening edge of the mounting groove 12 is
9, the rotation of the turntable 1 itself radially extends the revolving blade body 20 outward, so that the mowing operation can be efficiently performed. Moreover, during the mowing work,
Even if the revolving blade body 20 hits, for example, a tree stump, a stone, a fence support, or another obstacle, the shaft portion 23 retreats in a direction opposite to the turning direction of the turntable 1 and scatters them around or rebounds from them. It is possible to eliminate dangers such as settling, and to continue work safely.

Since the revolving blade 20 is provided with the blade portion 21 having a cutting edge of a predetermined shape, the revolving blade 20 itself is made of a rigid material, and the grass which hits the revolving blade 20 itself. And the like, and the mowing work is performed more smoothly by the rotational moment generated in the revolving blade body 20 itself.

Further, the revolving blade body 20 is hooked through a hook means 7 to a revolving blade body mounting hole 6 which is arranged in a mounting frame 5 formed at a position inside the peripheral edge of the rotary disk 1 and formed inside. With this configuration, the hook means 7 is not exposed outside the peripheral edge of the turntable 1, so that the grass is caught and entangled with the hook means 7 rotating together with the turntable 1 during the mowing operation. As a result, a rotational failure of the revolving blade body 20 does not occur, a stable rotational moment can be always maintained, and the mowing operation can be smoothly continued.

The revolving blade 20 is engaged with a mounting frame 31 provided on the bottom surface of the rotating disk 1 so as to be able to advance and retreat and swing freely.
Since the resilient means 35 for resiliently urging the revolving blade body 20 to protrude outward from the mounting frame 31 is provided in the mounting frame 31, the revolving blade body 20 tends to protrude outward from the mounting frame 31. By being elastically biased, it can be arranged substantially orthogonal to the mounting frame 31 while maintaining a state substantially parallel to the surface of the turntable. Therefore, the turning action of the turning blade 20 when cutting grass and the like greatly enhances the cutting force. It can perform extremely efficient work.

In addition, the resilient action of the resilient means 35 is such that the revolving blade body 20 engaged with the mounting frame 31 by the engaging portion 24 can be used for various obstacles such as stones, tree stumps, and post fences. Even if it hits, the resilient means 35 itself flexes flexibly, so that the retraction and avoidance of the revolving blade body 20 from an obstacle or the like is not only smooth, but also immediately after retreating or swinging, the original position is obtained. And there is no obstacle to continuing the mowing work as it is.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a use state according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part showing a state in which a revolving blade body is attached to the rotating disk via a revolving blade body mounting portion.

FIG. 3 is a plan view of the same notch.

FIG. 4 is a cross-sectional view of a principal part showing a state where a revolving blade is attached to a rotating disk via a revolving blade attaching part in another embodiment.

FIG. 5 (A), (B), (C), (D)
It is a perspective view which shows each form of a revolving blade body.

FIG. 6 is a side sectional view of another embodiment.

FIG. 7 is a partially cutaway perspective view of a use state according to another embodiment.

FIG. 8 is a partially cutaway plan view.

9A is a cross-sectional view of a main part, and FIG. 9B is a side view of the main part.

FIG. 10 (A), (B), (C),
(D) Each is a perspective view which shows other forms of a revolving blade body.

[Explanation of symbols]

P ... Operating rod Q ... Grip handle M ... Primer 1 ... Rotating disc 2 ... Screw fixing 5 ... Mounting frame 6 ... Revolving blade body mounting hole 7 ... Hook means 10 ... Revolving blade body mounting part 11 ... Frame 12 ... Mounting groove 15 ... Supporting board 16 ... Lid 17 ... Connecting part 18 ... Depressed part 19 ... Closing board 20 ... Slewing blade 21 ... Blade 22 ... Intermediate part 23 ... Shaft part 24 ... Engaging part 31 ... Mounting frame 32 ... Mounting hole 33 ... Washer 34 ... Mounting board 35 ... Spring means

Claims (8)

[Claims] 1. A rotary table driven to rotate by a tip of an operating rod of a mower main body, a rotating blade body mounting portion provided on a peripheral edge side of the rotary disk, and a rotating blade detachably mounted on the rotating blade body mounting portion. It is suspended and held so that it can be retracted to the opposite side to the turning direction of the board,
A rotary blade device for a mowing machine, comprising: a rotating blade body made of a rigid material radially arranged on the periphery of the turntable. 2. The revolving blade body mounting portion is configured to engage an engaging portion at a rear end of the revolving blade body with a mounting groove formed by cutting out a lower end edge of a frame formed on a bottom surface of a flat rotating disk. At the same time, a lid part for closing the opening edge of the mounting groove is formed on the peripheral edge, and a bottomed cylindrical shape fixed to the turntable with a predetermined gap with the frame inside the frame. The rotary blade device for a mower according to claim 1, further comprising a support plate. 3. The turning blade body mounting portion is provided with a rear end of the turning blade body in a mounting groove formed by notching from a bottom wall peripheral edge to a concave peripheral wall portion of the concave portion in the concave portion formed in the turntable. 2. The rotary blade device for a mowing machine according to claim 1, wherein a closing plate for engaging the joint portion and closing an opening edge portion of the mounting groove on the bottom wall side is fixed to the rotating disk. 4. A revolving blade body mounting portion is removably attached to a mounting frame formed at a position inward from a peripheral edge of the revolving disk, and is removably retractable to a side opposite to the revolving direction of the revolving disk. 2. A swivel blade body is suspended and held through the intervening member.
2. A rotary blade device for a mower according to claim 1. 5. The revolving blade body mounting portion engages with an engaging portion at a rear end of the revolving blade body in a mounting hole formed in a mounting frame provided on a bottom surface of the turntable so that the revolving blade body can move forward and backward. 2. A mowing machine according to claim 1, wherein a resilient means for swingably engaging and resiliently urging the revolving blade body so as to protrude outward from the mounting frame is provided in the mounting frame. Rotary blade device. 6. The resilient means is formed of a frame-shaped spring material in which a rear end of an engaging portion of the revolving blade body is abutted against an outer surface and is disposed in a mounting frame. The rotary blade device for a mowing machine according to claim 5, wherein the rotary blade device is formed so as to be long left and right. 7. The revolving blade body has a blade portion having a cutting edge of a predetermined shape, a shaft portion fitted into the mounting groove or the mounting hole of the revolving blade body mounting portion with play, and a mounting groove. The rotary blade device for a mowing machine according to any one of claims 1 to 6, further comprising: an engagement portion that is disposed on an inner side of the rotating disk with respect to the mounting hole and engages with a mounting groove or a mounting hole edge. 8. The rotary blade device for a mowing machine according to claim 7, wherein the blade portion has a polygonal shape in a cross section having a curved surface or a flat surface having an acute-angled apex serving as a blade edge.