JPS6119621Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a mower blade mounting structure.

The cutting blades of conventional mowers are attached to the underside of the disc via mounting brackets with bolts or the like. Therefore, when attaching or removing the cutting blade, it is necessary to turn the mower upside down, or to secure enough space below for the work to be done before removing or attaching bolts, etc. Further, when a bottom plate is provided below the disk, the above-mentioned operation cannot be performed unless the bottom plate is removed, which is very troublesome.

The present invention was devised in view of the above-mentioned problems, and it is an object of the present invention to provide a mower blade mounting structure that allows the cutting blade to be attached and detached with a one-touch operation. Therefore, the feature is that the disk 18 is rotatable around the vertical axis 7.
and a bottom disk 27 provided below the disk 18.
The cutting blade 28 can be freely retracted and retracted from between the outer periphery of the cutting blade 28.
In the mower equipped with
A pressing metal fitting 31 whose outer end is located radially inward and near the outer peripheral edge of the disk 18 and the bottom disc 27 is disposed between the outer peripheral edge of the disc 18 and the bottom disc 27, and this pressing metal fitting 31 The disk 18 and the bottom disk 2 in this press fitting 31 are pivotally connected to the lower surface of the disk 18 at a separate position so as to be rotatable around a horizontal axis 30.
A pivot shaft 32 that removably and rotatably supports the cutting blade 28 on either one of the outer end near the outer peripheral edge of the blade 7 and the part on the disk 18 side opposite to this outer end. is provided protruding toward the other side, and the press fitting 31
An elastic member 33 is provided to urge the disk 18 toward the disk 18, and the press fitting 31, pivot shaft 32, and elastic member 33 are covered from above and below by the disk 18 and the bottom disk 27, and the disk 18 and the bottom disk 2
7 and the cutting blade 2 relative to the pivot shaft 32.
8 is provided with a vertical gap for inserting a tool 38 from the outside and operating the press fitting 31 around the horizontal axis 30.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 shows an example of a mower 1 according to the present invention mounted on the front part of a tractor 2, and is suspended via a front three-point link mechanism 3 so as to be able to swing vertically. There is. and front power take-off device 4
The power of the tractor 2 is transmitted from the mower 1 to the mower 1 via the freely connecting shaft 5. A gear case 6 is provided on the upper part of the mower 1, and the case 6 constitutes a frame of the mower 1. A plurality of drive shafts 7 are provided in a hanging manner on the gear case 6, and the power of the tractor 2 is transmitted to these drive shafts 7 through the gear case 6. A cutting blade device 8 is provided at the lower end of the drive shaft 7. A sag 9 is provided on the periphery of the frame so as to surround the cutting blade device 8.

Details of the cutting blade device 8 are shown in FIG. 2. In the same figure, reference numeral 10 denotes a support tube, which is vertically fixed to the lower surface of the gear case 6 with bolts 11 or the like, and is removably attached.
The drive shaft 7 is rotatably mounted within the support tube 10 . The upper end of the drive shaft 7 protrudes into the gear case 6, and a bevel gear 12 is provided at the protruding end.
It meshes with the bevel gear 13 inside the gear case 6. This latter bevel gear 13 is connected to a transmission shaft 14 that is interlocked with an input shaft that receives the power of the tractor 2.
It is set in.

The lower end of the drive shaft 7 protrudes further downward than the lower end of the support tube 10, and a disk mounting flange 16 is provided at the protruding end via a key 15. The flange 16 has a lower end connected to the drive shaft 7 by the key 15, and an upper end fitted onto the support tube 10 through a bearing 17.

The disk 18 is attached to the flange 16 with bolts 19
It is removably fixed to the drive shaft 7 and rotates coaxially and integrally with the drive shaft 7. The peripheral edge of the disk 18 has a slope 20 that slopes downward.
A cylinder 21 extending from the upper surface of the disk 18 to the vicinity of the lower surface of the gear case 6 is provided on the upper surface of the disk 18 so as to be coaxial with the drive shaft 7, and protects the support cylinder 10 and the upper part of the flange 16, etc. A large number of rods 22 are vertically provided on the outer circumference of the cylinder 21 at predetermined intervals in the circumferential direction, and the rods 22 rotate integrally with the cylinder body 21 and have the function of brushing off cut grass, etc. .

In addition, a sleeve 23 is attached to the outer periphery of the lower end of the flange 16.
is freely rotatable via a bearing 24,
A main bottom disk 25 having an outer diameter approximately the same as that of the disk 18 is attached to the sleeve 23 .
Furthermore, an auxiliary bottom plate 26 that covers the lower end of the drive shaft 7, the lower end of the flange 16, and the lower end of the sleeve 23 is attached to the middle part of the lower surface of the main bottom disk 25,
The bottom disk 2 is formed by the main bottom disk 25 and the auxiliary bottom plate 26.
7. The outer circumferential edge of the bottom disc 27 has approximately the same diameter as the outer circumferential edge of the disk 18,
It is provided approximately concentrically with the disk 18.

There is a space between the disk 18 and the main bottom disc 25, and a gap is also provided between both peripheral edges. A plurality of cutting blades 28 that can freely move in and out of this gap are provided on the lower surface of the disk 18 at predetermined intervals in the circumferential direction and along the inclined portion 20 of the disk 18.

The mounting structure of the cutting blade 28 includes a bracket 29 provided on the lower surface of the disk 18, and a bracket 29 provided on the lower surface of the disk 18.
9, a horizontal shaft 30 supported substantially horizontally on the horizontal shaft 30, a pressing metal fitting 31 that is pivotally supported on the horizontal shaft 30 so as to be vertically movable and having one end as a free end; It has a pivot shaft 32 protruding toward the direction, and an elastic member 33 provided in the middle of the press fitting 31, and a cutting blade 28 is detachably and rotatably provided on the pivot shaft 32. It is something that Pressing metal fitting 3
1 is configured to be long in the radial direction of the disk 18, and is arranged such that its outer end is located radially inward than the outer peripheral edges of the disk 18 and the bottom disc 27. , the pivot shaft 32, the elastic member 33, etc. are all covered from above and below by the disk 18 and the bottom disk 27, so that only the cutting blade 28 protrudes outward.

That is, the elastic member 33 includes a stud 35 that is fixed to the disk 18 and projects into the space and is slidably inserted into a sliding hole 34 provided in the press fitting 31, and a stud 35 that projects from the sliding hole 34. A compression spring 36 is fitted onto the protruding end of the stud 35, and a nut 3 is screwed onto the protruding end of the stud 35 to prevent the compression spring 36 from falling off and to adjust the compression force.
7, etc., and the tip of a pivot shaft 32 provided at the free end of the press fitting 31 is elastically supported on the lower surface of the disk 18 by the elastic member 33. The pressing metal fitting 31, the elastic member 33, etc. are provided for each cutting blade 28.

According to the above embodiment of the present invention, in the mower 1 mounted on the front part of the tractor 2, the drive shaft 7 is rotated by the power from the tractor 2, and the disk 18 is rotated together with the drive shaft 7. As the disc 18 rotates, the cutting blade 28 attached to the pivot shaft 32 projects radially outward from the gap between the disc 18 and the bottom disc 27 due to centrifugal force, and the protruding cutting blade 28 cuts grass, etc. is reaped. If a foreign object such as a stone collides with the cutting blade 28, the cutting blade 28 rotates around the pivot shaft 32 and enters the space within the disk 18 through the gap, and the abnormal load is released. During this reaping, the mower 1 is only suspended by the front three-point linkage mechanism 3, so the ground contact height of the mower 1 fluctuates due to the vertical movement of the tractor 2 and the unevenness of the ground. However, since the bottom disc 27 is provided, if the bottom disc 27 is suspended so that it is always in contact with the ground, the height of the cutting blade 28 above the ground can be maintained constant by the bottom disc 27. The bottom disc 27
follows and touches the ground, so the cutting height remains constant. At this time, since the bottom disc 27 is freely rotatable, it effectively escapes from overload grounding.

Now, in order to replace this cutting blade 28, as shown in FIG. Then, the tip of the pivot shaft 32 provided at the free end of the press fitting 31 is released from contact with the lower surface of the disk 18, thereby creating a gap. However, the cutting blade 28 can be taken out from the gap between the levers. In this way, the mower 1 can be removed without removing the bottom disc 27.
Cutting blade 28 with one touch without having to turn it over again.
can be removed. When installing, just follow the above steps in reverse.

In addition, in the above embodiment, since the pressing fitting 31 is pressed by the compression spring 36,
The compression force can be adjusted freely and reliably. For example, compared to a device using a plate spring or the like as the pressing member itself, it is difficult to adjust the pressing force of a plate spring, and there is a risk of breakage if the cutting blade is frequently replaced. In this respect, if the structure is configured as in the above embodiment, there is no such possibility.

The one shown in FIG. 4 is another embodiment of the present invention, in which the pivot shaft 32 is provided on the disk 18 side, and a collar 39 is fitted onto the stud 35 between the disk 18 and the press fitting 31. However, excessive compressive force is prevented from acting on the press fitting 31.

Note that the present invention is not limited to the above-mentioned embodiments, and the pivot shaft may pass through the disk or the pressing fitting. In that case, a stopper may be provided to provide a predetermined gap between the pressing fitting and the disk. Needless to say. Alternatively, a pivoting portion may be provided in the middle of the pressing fitting, a pivot shaft may be provided at one end of the pressing fitting, and a compression spring may be interposed between the other end and the disk.

According to the present invention, when attaching and detaching the cutting blade, a tool such as a screwdriver is inserted from the outside through the vertical gap between the disk and the bottom disk, and the pressing fitting is operated around the horizontal axis. Therefore, the cutting blade can be attached and detached with one touch without reversing the mower or removing the bottom disc. Moreover, the outer peripheries of the upper and lower disks and the bottom disk are approximately the same diameter and are substantially concentric, and the cutting blade is removably pivoted near the outer periphery of these disks and the bottom disk. Since there is a pivot shaft, when inserting a tool and attaching/detaching the cutting blade, it can be easily engaged and detached from the outside, especially since the disc has approximately the same diameter as the bottom disc. There's no need for the disk to become too large from the top, making it difficult to see inside. Furthermore, since the pressing fitting is configured to be biased by an elastic member, the biasing force can be easily adjusted. The pressing fitting is arranged so that its outer end is located radially inward from the outer periphery of the disk and the bottom disk, and the pressing fitting, the pivot shaft, and the elastic member are pressed from above and below by the disk and the bottom disk. Since it is covered, grass etc. will not get caught in the attachment part of the cutting blade, the cutting blade can be attached reliably, and damage to the attachment part can also be prevented.

[Brief explanation of the drawing]

Fig. 1 is a side view of a mower according to the present invention attached to the front of a tractor, Fig. 2 is a sectional view of an embodiment of the invention, Fig. 3 is an explanatory diagram of the operation, and Fig. 4 is another embodiment of the invention. FIG. 3 is an example cross-sectional view. 7... Drive shaft (vertical axis), 18... Disc, 2
7... Bottom disc, 28... Cutting blade, 30... Horizontal shaft, 3
1...Press metal fitting, 32...Pivot shaft, 33...Elastic member.

Claims (1)

[Scope of utility model registration request] In a mower in which a cutting blade 28 is provided so as to be able to freely protrude and retract from between the outer periphery of a disk 18 rotatable around the vertical axis 7 and a bottom disc 27 provided below the disk 18, the outer periphery is approximately Between the disk 18 and the bottom disk 27, which have the same diameter and are substantially concentric, the outer end is located radially inward and near the outer periphery of the disk 18 and the bottom disk 27. A pressing metal fitting 31 is arranged, and this pressing metal fitting 31 is pivotally connected to the lower surface of the disk 18 at a position away from the outer end so as to be rotatable around a horizontal axis 30.
A cutting blade 28 is attached to either the outer end near the outer peripheral edge of the disc 18 and the bottom disc 27 in No. 1, or the part on the disc 18 side opposite to this outer end.
A pivot shaft 32 that is detachably and rotatably supports the
is provided with an elastic member 33 that protrudes toward the other side and urges the press fitting 31 toward the disk 18,
These pressing fittings 31, pivot shafts 32, and elastic members 3
3 is covered from above and below by the disk 18 and the bottom disk 27, and between the outer periphery of the disk 18 and the bottom disk 27, an outer portion is provided so that the cutting blade 28 can be engaged with and removed from the pivot shaft 32. A mower cutting blade mounting structure characterized in that a vertical gap is provided for inserting a tool 38 and operating a press fitting 31 around a horizontal shaft 30.