JPS5811137Y2 - Cutting blade device for lawn mowers, etc. - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cutting blade device mainly used in lawn mowers, brush cutters, and other various types of grass cutters.

This type of cutting blade device is constructed by attaching the cutting blade to the periphery of a rotating disc via fixing devices such as bolts and nuts. For example, when bolts and nuts are used as the fixing devices, the bolts are The bolt head or nut protrudes from the bottom of the rotary disk because it passes vertically through holes drilled in the rotary disk and the cutting blade.

For this reason, when moving the cutting blade along the ground surface, not only will grass get wrapped around protrusions such as bolt heads or nuts, but these protrusions may also get caught on stones or grass scattered on the ground. Smooth operation of the blade device was hindered, or the bolt head and nut could hit obstacles such as stones and break, and there was a danger that the cutting blade could come off during work and cause injury to the human body.

The present invention was devised in view of the above circumstances, and its purpose is to prevent the fixture for fixing the cutting blade to the rotating disc from protruding from the bottom surface of the peripheral part of the disc with a simple structure, and to An object of the present invention is to provide a cutting blade device for a lawn mower, etc., in which the cutting blade is rotatable.

For this purpose, the device of the present invention is such that a rotating disc is provided with a mounting seat for the cutting blade, and the cutting blade is attached to the mounting seat via a fixture, in which the rotating disc is mounted downward from its periphery. In addition, the mounting seat is arranged at a predetermined distance above the bottom surface so that the fixing tool does not protrude beyond the bottom surface of the peripheral portion, and the cutting blade is , is characterized in that it is rotatably mounted on the mounting seat.

Embodiments of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes a machine frame constituting the main body of the mower, which is equipped with casters 2 at the front and wheels 3 at the rear.A power engine 4 is mounted on the upper part, and a machine frame 1 that is driven by the engine 4 is mounted on the lower part. This cutting blade device 5 is equipped with a cutting blade device 5.
While driving the mower, the mower is moved by holding a handle 6 provided at the rear of the machine frame 1 to perform mowing work.

The cutting blade device 5 is composed of a rotating disk 7 and a plurality of cutting blades 8 arranged at equal intervals on the upper surface of the peripheral portion thereof.
The rotating disk 7 is connected to a vertical drive shaft 9 of the engine 4.
is mounted horizontally.

That is, the rotating disk 7 has a central portion bulged upward, and is inserted into the shaft 9 through a hole 10a bored in the center of the bulging portion 10, and the upper surface of the bulging portion 10 is inserted into the shaft 9. , axis 9
The holder 12 is fitted onto the outer periphery of the convex portion 11 a so as to abut against the boss member 11 fixed to the boss member 11 .
Tightening and unscrewing are prevented.

Further, on the upper surface of the peripheral portion of the rotating disk 7, a plurality of mounting seats 14 in the shape of side holes are equally distributed, and each mounting seat 14 is fixed to the upper surface of the rotating disk 7 by spot welding. has been done.

The cutting blade 8 is attached to the upper surface of each of the mounting seats 14 via fixtures such as stepped bolts 15 and nuts 16.

The stepped bolt 15 is passed through the bolt insertion holes 8a and 14a formed in the base of the cutting blade 8 and the mounting seat 14 from above, and a spring washer 17 is interposed below the mounting seat 14. Tighten with nut 16.

The nut 16 is screwed onto the bolt 15 through a hole 7b formed in the rotary disk 7 opposite to the bolt insertion hole 14a.

The lower surface of the mounting seat 14 is deviated from the bottom surface of the peripheral portion of the rotary disk that does not have any downward protrusion from the peripheral portion, and the nut 16 is located inside surrounded by the mounting seat 14. , so as not to protrude downward from the bottom surface of the peripheral portion of the rotating disk 7.

Further, the stepped portion 15a of the stepped bolt 15 is connected to the mounting seat 14.
The cutting blade 8 is rotatable about the bolt 15 between the bolt head 15b and the mounting seat 14.

6 and 7 are other embodiments of the present invention, in which mounting seats 24 are formed at equal intervals by directly squeezing out a plurality of locations on the periphery of the rotary disk 7 upward, and The cutting blade 8 is mounted on the mounting seat 24 via the stepped bolt 15 and nut 16 in the same manner as in the embodiment described above.

Each of the nuts 16 is located in a space below the mounting seat 24, and is prevented from protruding downward from a plane including the bottom surface of the peripheral portion of the rotary disk 7, which has no protruding portion downward from the peripheral portion. It has become.

Note that the other configurations are substantially the same as those of the embodiment shown in FIGS. 1 to 5 described above, so corresponding members are given the same numbers and description thereof will be omitted.

In such a configuration, the rotating disk 7 is driven by the engine 4.
When the blade 8 is rotated, the centrifugal force causes the cutting blade 8 to rotate around the bolt 15, and the tip of the cutting blade 8 is radially swung outward from the peripheral edge 7C of the rotary disk 7. Cut the grass that touches blade 8.

The operator performs the mowing work while pushing the mower with the handle 6.

At this time, since the nut 16 of the bolt 15, which is the fixing device for the cutting blade 8, does not protrude from the bottom surface of the peripheral part of the rotating disk 7, there is no chance of it hitting an uneven part of the ground or an obstacle such as a stone. Accidents such as the bolt/nut being damaged or broken and the cutting blade 8 flying off during work are prevented, and the nut 16 is prevented from becoming entangled with grass.
Since it is surrounded by the side wall of the mounting seat 14, obstacles such as stones that collide with the rotating disk 7 and fly away will not hit it, and damage to it is further prevented and the nut 16
Grass is further prevented from getting entangled with the rotary disk, and the rotary disk 7 can be shaped into a sled to smoothly operate along the unevenness of the ground, thereby reducing running resistance when moving on uneven ground.

Further, when the cutting blade 8 hits an obstacle such as a stone during work, the cutting blade 8 rotates around the bolt 15 in the opposite direction to the rotation direction of the rotating disc 7. This prevents the cutting blade 8 from breaking or stones etc. from flying off.

When the work is finished, the cutting blade 8 is rotated around the bolt 15 so as to be positioned inward from the peripheral portion 7C of the rotary disk 7 to prevent injury due to carelessness.

As described above, in the present invention, the cutting blade fixing device is configured so as not to protrude from the bottom surface of the peripheral part of the rotating disk, and is surrounded by the side wall of the mounting seat, and the cutting blade is Because it is rotatably mounted on the mounting seat, there is no obstacle such as grass getting tangled with the fixing device or the movement of the rotating disc being obstructed by hitting stones, and the fixing device does not have to be blocked by stones or other obstacles during work. The danger of the cutting blade falling off is eliminated because it is not damaged or broken when it hits the cutting blade, and furthermore, the cutting blade retreats inward of the rotating disk when an obstacle such as a stone collides with it. This has excellent effects such as preventing breakage and scattering of stones, etc.

[Brief Description of the Drawings] Fig. 1 is a side view showing an embodiment of the present invention, Fig. 2 is an enlarged plan view of the cutting blade device, Fig. 3 is a vertical cross-sectional view of the cutting blade device, and Fig. 4 is a cross-sectional view of the cutting blade device. 3 is an enlarged view of the main part, FIG. 5 is a perspective view of the same main part, FIG. 6 is a sectional view of a cutting blade device showing another embodiment of the present invention, and FIG. 7 is an implementation shown in FIG. 6. FIG. 2 is a perspective view of an example rotating disk. 1... Machine frame, 2... Casters, 3.
...Wheels, 4...Engine, 5...
...Mower blade device, 6...Handle, 7...
・Rotating disc, 8...Cutter blade, 8a...Insertion hole, 9...Shaft, 10...Bulging part, 1
0 a...hole, 11...boss member, 1
1 a... Convex portion, 12... Receiver, 13
...Nut, 14...Mounting seat, 14a
......Through hole, 15...Step bolt, 1
5a...Step part, 15b...Head, 1
6... Nut, 17... Washer, 2
4...Mounting seat.

Claims (1)

[Scope of utility model registration request] A mounting seat for the cutting blade is provided on the periphery of a rotating disk, and the cutting blade is attached to the mounting seat via a fixing device such as a bolt or nut, in which the rotating disk protrudes downward from the periphery. The mounting seat is formed so as to have no part, and the mounting seat is
Make sure that the fixing tool does not protrude beyond the bottom of the peripheral area.
A cutting blade device for a lawn mower or the like, characterized in that the cutting blade is arranged at a predetermined distance above the bottom surface, and the cutting blade is rotatably attached to the mounting seat.