JPS631789Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a cutting height adjusting device for a lawn mower. The purpose is to provide a mowing height adjusting device for a lawn mower that can be adjusted stepwise to a desired mowing height.

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

In the drawing, S indicates the entire lawn mower.
Its general structure consists of an operating section that performs lawn mowing operation.
S ₁ , and a support part S ₂ for supporting this. First, the operating section will be explained (see Fig. 2).

A cutter housing 1 houses a cutter 17 and the like, and is formed in the shape of a shallow dish opening downward, and its peripheral edge is folded upward to form a reinforcing flange edge 2. A cowling 3 formed in a bowl shape is mounted substantially coaxially with the cutter housing 1 from above. Furthermore, a substantially cylindrical motor housing 4 that is open both upward and downward and communicates with the cutter housing 1 is housed within the cowling 3, and furthermore, an electric motor is connected to the motor housing 4 via a suitable bracket or the like. 5 is suspended. The electric motor 5
The motor shaft 6 is rotatably supported via bearings 7 and 8 at its upper and lower ends. Further, on the upper end side, a drive confirmation disk 9 is fitted in order to confirm the drive of the electric motor 5, and this allows the operator to see the transparent The driving status of the electric motor 5 can be visually confirmed through the cap 10. On the other hand, a suction fan 11 is fitted within the cutter housing 1 on the lower end side of the motor shaft 6, and the rotation of this fan 11 makes it possible to levitate the entire operating section _S1 . In addition, the suction fan 1
External air introduced into the cutter housing 1 at step 1 passes through two paths as shown in FIG. That is, one path is a path through which water flows into the cutter housing 1 from an appropriate number of suction windows 12 arranged on the side of the cowling 3 through an introduction hole 13 penetrating a part of the upper surface of the cutter housing 1. , and the other path is from the suction window 12 to the dust filter 14.
This is a cooling path that flows into the motor housing 4 through the cooling hole and then flows down into the cutter housing 1.

Now, the fitting shaft portion 11A of the suction fan 11
, a mounting groove 15 is concentrically drilled to a predetermined depth in the lower end surface shown in the figure.
Spacer 4 for adjusting the cutting height, which will be described later in 5.
2 can be detachably attached. In addition, in this example, the mounting groove 15 is also formed on the illustrated upper end surface of the fitting shaft portion 11A.
A groove 16 similar to that shown in FIG. This is to make the thickness of the suction fan 11 substantially uniform and to strengthen it.

The cutter 17 is mounted coaxially with the suction fan 11 on the underside of the suction fan 11, and is tightened and fixed by screwing a tightening bolt 18 into the motor shaft 6. However, the state shown in FIG. 2 shows a state in which a spacer 42, which will be described later, is not attached, and in this state, the cutter 17 is positioned at the highest cutting height (H ₁ ) in this example.

Next, the support part S ₂ will be explained. Reference numeral 19 is a lower handle, which is made of metal pipe material and has a generally U-shape as a whole, and is pivoted on both sides of the outside of the cutter housing 1. . Further, this lower handle 19 has a lock arm 20 attached to the lower part of one side thereof, and a guide hole 20 on the cutter housing 1 side.
By slidingly displacing it along the line, it is possible to fix it at an arbitrary standing angle from the lying position to the standing position at a predetermined angle.

Further, in this example, an upper handle 22 extends in the same direction as the lower handle 19. The upper handle 22 is made of metal pipe material and has a substantially U-shape as a whole, and a connecting pin 23 is provided between both sides on the outside of the lower handle 19.
They are foldably connected by hanging them horizontally. In addition, the inner surface of the upper handle 22 is crushed into an arc over a predetermined range at the connection part with the lower handle 19 so that it can conform to the outer circumferential shape of the lower handle 19 (see FIGS. 4 and 4). (See Figure 5). Furthermore, a lock piece 24 is located near the lower end of one side of the upper handle 22.
There are 25 pins attached. An engagement groove 26 is formed in the center of the inner side of the lock piece 24 and can be releasably engaged with the connecting pin 23. In this example, when the lock piece 24 is locked, one end of the connecting pin 23 (the end corresponding to the lock piece 24) is used to prevent rattling between the handles 19 and 22. An arc washer 27 formed in a hemispherical shape is attached to. That is, when the lock piece 24 is locked, the lock piece 24
is slid between the upper handle 22 along the arc surface of the arc washer 27, thereby allowing both handles 19 and 22 to be tightly fixed without wobbling.

Next, the operating mechanism of the electric motor 5 will be explained (see FIGS. 6 to 9).

At the top of one side of the Atsupa handle 22,
A switch box 28 for turning on and off the electric motor 5 is installed. The switch box 28 is opened in the left-right direction in FIG. 6, and consists of a first box 28A and a second box 28B, which are each formed in half. The top handle 22 is inserted into the first chamber 29), and is attached to the top handle 22 by screwing. On the other hand, the other side chamber (second chamber 30) of the switch box 28 is connected to the electric motor 5 via a lead wire 31, and the electric motor 5 can be turned on and off by gripping an operating lever 32. A switch mechanism 33 is housed. In addition, in this example, the operating lever 32 is equipped with a safety means to prevent the operating lever 32 from being operated carelessly (seventh,
(See Figure 8). This will be explained below.

The operating lever 32 is connected to both boxes 28A, 28.
The gripping operation is supported by a lockshaft 34. This lock shaft 34 is formed into a substantially round rod shape, and both boxes 28
A, 28B and the operating lever 32 are slidably inserted thereinto, and press buttons 35A, 35B are screwed to both ends thereof, respectively. Moreover, each of the press buttons 35A, 35B has a storage recess 3 formed in each of the boxes 28A, 28B.
7A, 37B, each press button 35
The lockshaft 34 can be displaced in the axial direction for a predetermined stroke by pushing the lock shafts A and 35B.

An engaging portion 38 having a substantially oval cross section is formed in a predetermined area of the lock shaft 34 near the first box 28A. Correspondingly, the operating lever 32 and the first box 28A are provided with lock holes 39, 40 having a substantially oval cross-section that can fit into the engaging portion 38 over a range corresponding to the stroke of the lock shaft 34. They are formed in alignment with each other. When the lockshaft 34 is pushed in the direction of arrow Q in the figure, the engaging portion 38 of the lockshaft 34 engages both the lock holes 3 of the operating lever 32 and the first box 28A.
9 and 40, thereby restricting the gripping operation of the operating lever 32. Conversely, when the lockshaft 34 is pushed in the direction of arrow P in the figure, the operating lever 3
The round shaft portion of the lock shaft 34 is positioned in the lock hole 39 on the second side, thereby making it possible to grip the operating lever 32.
Accordingly, the electric motor 5 can be driven via the switch mechanism 33 (see FIG. 8).

Although not shown, the operating lever 32 is provided with a return means for the gripping operation. Further, 41 is an O-ring fitted to the round shaft portion of the lockshaft 34, which can provide the necessary sliding resistance when the lockshaft 34 is pushed in. In other words, it can reduce vibrations generated during lawn mowing work. The lockshaft 34 can be held against the

Next, a mowing height adjusting device will be explained.

First, the spacer 42, which is attached to the mounting groove 15 of the suction fan 11 and is used to adjust the cutting height, will be described. The spacer 42 is formed into a substantially cylindrical shape, and furthermore, at a height position offset from the center to one side, its outer circumferential surface and inner circumferential surface are each integrally extended in the radial direction, and the locking step edge 43 were formed. In other words, the spacer 42 has different heights (fitting amount) between the upper and lower sides of the locking step edge 43. Therefore, as shown in FIGS. 10 and 11, by appropriately selecting the fitting side of the spacer 42 with respect to the mounting groove 15,
The mowing height (H ₂ ) and (H ₃ ) can be selected. In this example, in order to prevent the spacer 42 from being lost when the spacer 42 is not attached as shown in FIG. 2, a storage location for the spacer 42 is secured in the switch box 28 (see FIG. 9). That is, a mounting boss portion 44 having approximately the same height as the spacer 42 is formed in the center of the first box 28A. It is stored by tightening the bolt 46.

Next, the operation and effects of this embodiment related to the above configuration will be specifically described.

First, lawn mowing work will be explained. At first,
By pressing the push button 35B on one side, the lockshaft 34 is displaced in the direction of arrow P in the figure,
Release the operating lever 32 from its locked state.
When the operating lever 32 is squeezed under this, the electric motor 5 is driven via the switch mechanism 33, and the suction fan 11 and the cutter 17 are rotationally driven. When air is sucked into the operating part S1 by the suction fan ₁₁ , the suction air generates a strong downward airflow inside the cutter housing 1,
As a result, the actuating portion _S1 is supported floatingly. By steering the top handle 22 in this state, the lawn mower S can be mowed while easily moving the entire lawn mower S. At this time, if the spacer 42 is not installed as shown in FIG. 2, the cutter 17 is installed at the highest position from the ground, and the cutting height is _H1 as described above.

Now, if it is desired to change the cutting height from the above state, a spacer 42 is attached to the motor shaft 6. That is, while loosening the bolt 46 and removing the spacer 42 from the switchbox 28, loosening the tightening bolt 18 and removing the cutter 1
Remove 7. Then, by reinstalling the cutter 17 with the tightening bolt 18, the cutting height can be changed. In other words, the locking step edge 4 at the spacer 42
If you insert the longer side into the mounting groove 15 with the 3-point as the boundary, the cutting height will be H ₂ (see Figure 10), and if you insert the shorter side into the mounting groove 15, you will get a cutting height of H ₃ (see Figure 10). (See Figure 11). Therefore, according to this example, two types of cutting heights can be obtained by appropriately selecting the mounting direction of the spacer 42, and three types of cutting heights can be obtained in addition to the above-mentioned state without mounting. You can choose. On the other hand, in this example, even when the spacer 42 is not attached, a storage space is secured in the switch box 28, so that loss of the spacer 42 can be avoided as much as possible.

When the mowing work is completed, the push button 35A on one side is pressed to displace the lock shaft 34 in the direction of the arrow Q in the figure, and the engaging portion 38 is engaged across both the lock holes 39 and 40. According to
Keep the operating lever 32 in the locked state. This prevents the operating lever 32 from being operated carelessly, and therefore prevents unexpected accidents from occurring, so the lawn mower S of this example is highly safe in this respect as well. I can say that. Furthermore, in this example, the upper handle 22 can be folded by releasing the lock piece 24, and the lower handle 19 can also be folded by releasing the lock arm 20, so the entire lawn mower S can be made compact. It also has the effect of being able to be stored.

As explained above, in the present invention, a drive motor is disposed in the operating section facing downward, and a fan for floating the operating section and a cutter for mowing the lawn are fitted on the motor shaft at the top and bottom, respectively. Further, in a lawn mower in which a spacer is removably interposed between the fan and the cutter in order to adjust the mounting height of the cutter, the lower end surface of the shaft portion of the fan fitted into the motor shaft is provided with a predetermined depth. While forming a mounting groove for the spacer, a flange-like locking step edge is formed on the outer circumferential surface of the spacer at a position vertically offset from the center to abut against the lower end surface of the fitting shaft. In particular, the gist of the present invention is that the insertion depth of the spacer into the mounting groove differs across the edge of the locking step.

That is, since the length of the spacer is different between the upper and lower sides of the locking step edge, the mounting height of the cutter can be changed by inserting either the long or short side of the spacer. Therefore, by intervening or not using a single spacer, and by selecting the direction of insertion, the height at which the cutter is installed (cutting height) can be adjusted to three levels in total. can do.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a side view of the lawn mower, Fig. 2 is a cross-sectional view of the operating part, and Fig. 3 is a connecting part between the lower handle and the upper handle. FIG. 4 is a sectional view taken along the line A-A in FIG. 3, FIG. 5 is a sectional view taken along the line B-B in FIG. 3, FIG. 6 is an enlarged view showing the vicinity of the switch box, and FIG. is a sectional view taken along the line CC in FIG. 6, FIG. 8 is a sectional view taken along the line D-D in FIG. 7, and FIG. 9 is a sectional view taken along the line E-- in FIG.
The E-line sectional view, FIG. 10, and FIG. 11 are partially enlarged sectional views showing various aspects when the spacer is attached. 5...Electric motor, 6...Motor shaft, 11A...
...Inset shaft part, 15...Mounting groove, 17...Cut, 42...Spacer, S...Lawn mower, S ₁ ...
Actuating part, S ₂ ...Support part.

Claims (1)

[Scope of utility model registration request] The drive motor is installed facing downward inside the actuating part.
A fan for floating the operating part and a cutter for mowing the lawn are fitted on the top and bottom of the motor shaft, respectively, and a spacer can be attached and removed between the fan and the cutter to adjust the installation height of the cutter. In the lawn mower, a mounting groove of a predetermined depth is formed on the lower end surface of the shaft part of the fan fitted into the motor shaft, and a mounting groove of a predetermined depth is formed on the outer circumferential surface of the spacer. By forming a flange-shaped locking step edge that abuts against the lower end surface of the fitting shaft portion at the position where the locking step edge is formed, the depth of insertion of the spacer into the mounting groove can be adjusted using the locking step edge as a boundary. A mowing height adjustment device for a lawn mower, characterized in that the mowing height adjustment device is configured to be different.