JP3411481B2 - Support structure of reel blade in lawn 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 reel blade supporting structure in a lawnmower.

[0002]

2. Description of the Related Art Generally, a reel blade of a lawn mower needs to be replaced when the blade is not sharp due to wear or damage. On the other hand, since the reel blade has a relatively large weight, it is usually structured so as to be relatively firmly rotatably supported between the pair of left and right side plates. For this reason, in the case of replacing the reel blade, it has conventionally been necessary to remove the side plates together with the side housing and then disassemble the periphery of the supporting portion to a considerable extent.

[0003]

Therefore, the work of replacing the reel blades is very time-consuming and troublesome. Therefore,
SUMMARY OF THE INVENTION An object of the present invention is to provide a reel blade support structure capable of easily replacing a reel blade in a lawnmower.

[0004]

Therefore, in the support structure according to the first aspect of the present invention, both ends of the reel shaft are rotatably supported through bearings between a pair of left and right side plates mounted along both side walls of the main body housing. In the support structure of the reel blade, a bearing for rotatably supporting one end of the reel shaft is provided in a circular hole portion of a keyhole-shaped support hole formed by cutting from the lower end of one side plate, in the axial direction of the reel shaft. It is mounted via a removable bearing holder, and the width of the groove portion of the support hole is set to a width that allows the reel shaft to be inserted therethrough.

According to this support structure, since the bearing holder can be moved in the axial direction of the reel shaft and removed from the circular hole of the support hole, the reel blade is still attached to the reel shaft. Can be moved in its axial direction. By moving the reel blade in the axial direction, the other end of the reel shaft can be removed from the side plate. On the other hand, since the groove portion of the support hole is formed to have a width that allows the reel shaft to be inserted therethrough, one end side of the reel shaft can be removed from the side plate through the groove portion, and thus the reel blade is removed from between the side plates. be able to. To install the reel blade, the procedure reverse to the above may be performed.

In this way, the reel blade can be removed from between the side plates by simply removing the bearing holder on one end side of the reel shaft while leaving both side plates as they are. Since it is not necessary to disassemble the periphery of the rotation support portion to a considerable extent after the removal, the reel blade can be replaced more easily than before.

According to a second aspect of the present invention, there is provided the support structure according to the first aspect, wherein a transmission belt is mounted between the drive pulley and one end of the reel shaft, which is closer to the tip than the bearing holder. A driven pulley is attached, and an openable / closable lid is provided on a side wall of the main body housing on a side of the driven pulley.

According to this support structure, since the side of the driven pulley is opened when the lid is opened, the work of attaching and detaching the transmission belt can be easily performed from the side. Normally, the drive pulley and the driven pulley around which the transmission belt is stretched are located in the gap between the main body housing and the side plate, so if the lid is not provided, the transmission belt will be removed when the reel blade is replaced. Must turn the lawn mower upside down. In this respect, according to the configuration of claim 2, the transmission belt can be detached and attached from the side. Therefore, the lawn mower does not need to be turned upside down, and the transmission belt is in a normal posture in which the wheels are grounded. You can easily carry out the desorption work.

According to a third aspect of the present invention, there is provided the support structure according to the second aspect, wherein the driven pulley is provided with a screw fastening hole in accordance with a position of a screw for fixing the bearing holder to the side plate. Characterize.

According to this support structure, since the screw for fixing the bearing holder can be loosened or tightened by the screwdriver tool through the screw tightening hole provided in the driven pulley, the driven pulley is removed from the reel shaft. The bearing holder can be removed from the side plate without removing it, and in this respect, the reel blade replacement operation can be further simplified.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Next, referring to FIG.
~ It demonstrates based on FIG. FIG. 1 shows the entire lawn mower 1 to which the reel blade support structure according to the present embodiment is applied. In the figure, 2 is a main body housing, 3 is an operation handle attached to the rear part of the main body housing 2 obliquely upward, 4 is a pair of left and right front wheels, 5 is a cylindrical rear wheel, and 6 is the cut grass. The bag for doing is shown. No particular changes are required for these. Reference numeral 7 denotes a blade height adjusting lever arranged on the front side of the upper surface of the main body housing 2, and reference numeral 8 denotes a lid provided on a side wall of the main body housing 2.

As shown in FIGS. 2 to 4, the body housing 2 has an upper surface 2a having a smooth curved end.
And a pair of left and right side walls 2b and 2c, the lower surface side of which is open. Inside the side walls 2b and 2c, a pair of left and right side plates 10 and 11 are attached in parallel with each other. Both side plates 10 and 11 are fixed to the inside of the main body housing 2 by screws 12 to 12 and 13 to 13, respectively.

At the tips of both side plates 10 and 11,
A support plate 15 having a substantially triangular shape (see FIG. 2) is attached via a support shaft 14 so as to be vertically rotatable.
Since the upper ends of both support plates 15 and 15 are connected by the connection plate 17, both support plates 15 and 15 are connected .
The reference numeral 15 integrally rotates up and down around the support shafts 14, 14. The front wheel 4 is rotatably supported at the tip corners of both support plates 15, 15. A bracket 16 for holding the adjustment position is attached to the upper surface of the connecting plate 17, and the bracket 16 and the connecting plate 1 are attached.
The lever 7 for adjusting the blade height is supported so as to straddle between the lever 7. This will be described later.

The rear wheel 5 is rotatably mounted between the rear ends of the side plates 10 and 11.

Next, between the side plates 10 and 11, the electric motor 20 and the reel blade 3 are arranged from the left side in FIG.
0 and the fixed blade 40 are attached. First, the motor case 21 of the electric motor 20 has a cylindrical shape as shown in the figure, and the left and right end surfaces thereof are fixed to the side plates 10 and 11 by screws 23 to 23, whereby the electric motor 20 is fixed to both sides. It is attached in a state of being sandwiched between the side plates 10 and 11. The armature 22 and the like are incorporated in the cylindrical motor case 21.

Both ends of the armature shaft 24 are bearings 27, 2
It is rotatably supported by 8, and its tip projects from the side plate 10, and the drive pulley 25 is attached to this projecting portion. As shown in FIG. 4, one end surface of the motor case 21 is closed by a left side plate (upper side in the drawing), and the side plate 10 has a function of forming a part of the motor case 21. . The bearing 27 is housed in the holder portion 10 a provided on the side plate 10. A cooling fan 26 is attached to the armature shaft 24 inside the bearing 27 (lower side in the drawing). Further, as shown in FIG. 3, the bearing 28 that rotatably supports the rear end of the armature shaft 24 has a bearing holder portion 21 integrally formed inside the motor case 21.
It is housed in a.

Next, a reel blade 30 is rotatably attached to the rear side of the electric motor 20. This reel blade 3
0 is a plurality of spirally twisted blades arranged in a substantially cylindrical shape, and the reel blade 30 itself does not need to be changed. The reel blade 30 rotatably supports both ends of the reel shaft 31 by bearings 32 and 33, and is rotatably supported between the side plates 10 and 11. The left bearing 32 that rotatably supports the left end of the reel shaft 31 is housed in a bearing holder 34 attached to the side plate 10. The bearing holder 34 is fitted into a keyhole-shaped support hole 10b formed in the side plate 10 and attached by four screws 35 to 35 (see FIG. 2).
Therefore, if the screws 35 to 35 are removed, the bearing holder 3
4 is outside from the side plate 10 (upper side in FIG. 4)
It can be removed by pulling it out.

One end of the reel shaft 31 is projected from the bearing holder 34, and the driven pulley 36 is fixed by a nut 36b. A transmission belt 37 is stretched between the driven pulley 36 and the drive pulley 25. Through holes 36a to 36a are formed in the driven pulley 36 at four equal positions on the same circumference.
The through holes 36a to 36a are arranged in accordance with the positions of the screws 35 to 35 for fixing the bearing holder 34, and the four screws 35 to 35 are always provided at four positions in the rotation direction of the driven pulley 36. It is set so as to be aligned with 35. Accordingly, the screws 35 to 35 are loosened without removing the driven pulley 36 from the reel shaft 31, and the bearing holder 3
4 can be removed from the side plate 10.

The right bearing 33 for rotatably supporting the right end of the reel shaft 31 is received in the recess 11a provided on the right side of the side plate 11 as shown in FIG. Bearing 33
Are relatively loosely accommodated in the recess 11a, so if the reel blade 30 is moved in the axial direction, the reel shaft 3
It can be easily removed from the recess 11a in the state of being attached to the first side.

Here, the keyhole-shaped support hole 10b to which the bearing holder 34 is attached is shown in FIG. The support hole 10b is composed of a circular hole portion 10c having a diameter D into which the bearing holder 34 can be fitted, and a groove portion 10d formed by cutting from the lower end of the side plate 10 and opening into the circular hole portion 10c. The width L of the groove portion 10d is smaller than the outer diameter d1 of the bearing holder 34 and the outer diameter d2 of the reel shaft 31.
Is set larger than. Therefore, the bearing holder 3
In the state where 4 is attached to the side plate 10, the reel blade 30 is rotatably supported so as to be immovable in the radial direction, but when the bearing holder 34 is pulled out from the circular hole portion 10c, only the reel shaft 31 is inside the circular hole portion 10c. Therefore, the reel blade 31 can be moved in the radial direction while the reel shaft 31 is being inserted into the groove portion 10d.
When the reel shaft 31 is removed from the support hole 10b through 0d, one of the reel blades 30 can be removed from the side plate 10.

Next, a fixed blade 40 is attached to the rear side of the reel blade 30 via a fixed blade holder 41. As shown in FIGS. 2 and 3, the fixed blade holder 41 has a frame-like shape in which the lower portion of the reel blade 30 is opened, and its rear end is vertically rotatable via support shafts 42, 42, and is a left and right side plate. It is supported by 10 and 11. On the other hand, the tip side of the fixed blade holder 41 has screws 43 for position adjustment,
It is supported by the main body housing 2 via 43. Figure 2
As shown in, a compression spring 45 is interposed between the position adjusting screw 43 and the main body housing 2.

Therefore, the screws 43, 4 for adjusting the position are provided.
When 3 is loosened, the tip end side of the fixed blade holder 41 is pushed down by the compression spring 45, whereby the fixed blade holder 41 can be rotated downward and the position of the fixed blade 40 can be displaced downward. . When the fixed blade 40 is displaced downward, the space between the fixed blade 40 and the reel blade 30 is widened, and more grass can be caught at one time. On the other hand, when the position adjusting screws 43, 43 are tightened against the compression spring 45, the tip end side of the fixed blade holder 41 is displaced upward, whereby the fixed blade holder 41 is rotated upward to rotate the fixed blade. The position of 40 can be displaced upwards. When the fixed blade 40 is displaced to the upper side, the interval between the fixed blade 40 and the reel blade 30 is narrowed, and the amount of grass to be bitten at one time can be reduced.

Next, as shown in FIGS. 2 and 4, the above-mentioned lid 8 is attached to the side of the driven pulley 36. The lid 8 is attached by screws 8a to 8a to a portion of the left side wall 2b of the main body housing 2 which is opened at a side portion of the driven pulley 36. Therefore, when the lid 8 from which the screws 8a to 8a are removed is removed, the side of the driven pulley 36 is opened. Various work such as work for attaching and detaching the transmission belt 37 can be performed through the opened opening 8b.

Next, the lever 7 for adjusting the blade height will be described. The lever 7 is for adjusting the height (blade height) of the reel blade 30 with respect to the ground to adjust the cutting height of the grass, and the bracket 16 has a U-shaped cross section.
And the connecting plate 17 are mounted so as to straddle between them. Details of this attachment point are shown in FIG. As shown in the drawing, a through hole 17a is formed substantially in the center of the left and right of the connecting plate 17, and a bracket 16 attached to the upper side is formed with a long groove 16a in the left and right.

The lever 7 is inserted into the through hole 17a and the groove 16a.
Has been inserted. The lower end of the lever 7 has a flange portion 7b.
Since this is formed, this lever 7 is designed so as not to come out upward. On the other hand, the lever 7 is projected further upward through the groove hole 16a, and the retaining ring 7c is attached to this protruding portion, so that the lever 7 is supported so as not to come off from the bracket 16 and the connecting plate 17 in the end. There is. However, the retaining ring 7c and the bracket 16
Since an appropriate gap is provided between the upper surface and the upper surface of FIG. 3, it can be tilted from the upright position shown by the solid line to the inclined position shown by the chain double-dashed line. Further, since the tension spring 18 is interposed between the lever 7 and the bracket 16, the lever 7 is biased to the upright position side.

The upper end of the lever 7 thus supported is projected upward through the blade height changing groove 9 of the blade height adjusting plate 19 mounted on the upper surface 2a of the main body housing 2, and the upper end of this protruding portion. The knob 7a is attached to the. The blade height changing groove 9 is a groove having a substantially comb shape as shown in FIG. 6, and is one longitudinal groove 9 a long in the front-back direction of the lawnmower 1.
And a plurality of laterally long lateral grooves 9b to 9b (five in the drawing) cut from the vertical groove 9a to the right side (left side in the drawing). The five lateral grooves 9b to 9b are formed in parallel with each other at appropriate intervals in the front-rear direction. The lever 7 is in the upright position when it enters any of the lateral grooves 9b, so that the tension spring 18 holds the lever 7 in the upright position in the lateral groove 9b.

When the lever 7 is tilted to the left (right side in FIG. 9) against the tension spring 18, the lever 7 is moved to the vertical groove 9a.
It can be located inside, which allows the lever 7 to be moved back and forth along the longitudinal groove 9a. Lever 7
Is moved to the position of another lateral groove 9b, and then the hand holding the knob 7a is released, the lever 7 enters into the other lateral groove 9b by the tension spring 18 and is held in the lateral groove 9b.

By thus changing the tilting position of the lever 7 stepwise, the support plates 15, 15 can be rotated up and down about the support shafts 14, 14.
Thereby, the height of the front wheels 4, 4 can be adjusted.
Since the height of the rear wheels does not change, the heights of the reel blades 30 and the fixed blades 40 from the ground can be adjusted by adjusting the heights of the front wheels 4 and 4. As shown in FIG. 6, a numerical value indicating the blade height is displayed on the right side (left side in the figure) of the blade height adjusting plate 19 in accordance with the positions of the lateral grooves 9b to 9b. Set the lever 7 to the uppermost (rear side) lateral groove 9
When it is located at b, the blade height is the smallest (8 mm). On the other hand, when the lever 7 is located in the lowermost (front) lateral groove 9b, the blade height becomes the largest (25 mm).

The lawnmower 1 of the present embodiment configured as described above
According to this, since the motor case 21 of the electric motor 20 is mounted in a state of being sandwiched between the side plates 10 and 11, the rigidity of the frame of the side plates 10 and 11 is enhanced, and in this respect, The motor 20 also has a function of increasing the frame rigidity of the lawnmower 1. For this reason, both side plates 10 and 1 are provided as in the conventional case.
There is no need to additionally install a reinforcing member for increasing the rigidity of the frame between the two, thereby reducing the number of parts and reducing the cost, and foreign matter such as grass cut off in the main body housing 2. Can be prevented from accumulating.

Further, since the left side plate 10 has the function of forming a part of the motor case 21, the number of parts can be reduced and the lawn mower 1 can be reduced in weight. it can. The side plate 10 having a function as a part of the motor case 21 also means that the side plate 10 is provided with a bearing 27 for rotatably supporting the armature shaft 24.

In the illustrated embodiment, only the left side plate 10 has a function as a part of the motor case 21, but the rear end side of the armature shaft 24 is rotated to the right side plate 11. If you support
The motor case 2 is attached to the left and right side plates 10 and 11.
It is possible to combine the functions of the front surface and the rear surface. On the contrary, the motor case 2 is attached to the side plates 10 and 11.
The motor case 21 itself may be provided with a front surface and a rear surface, and the front surface and the rear surface may be fixed to the side plates 10 and 11, respectively.

Further, according to the lawnmower 1 illustrated, the bearing holder 34 is moved in the axial direction of the reel shaft 31 so as to support the support hole 1.
Since it can be extracted from the circular hole 10c of 0b,
The reel blade 30 can be moved in the axial direction with the bearing 32 and the bearing holder 34 attached to the reel shaft 31. By moving the reel blade 30 in the axial direction, the other end side of the reel shaft 31 is left with the bearing 33 or the bearing 33 is left in the recess 11a.
Can be removed from. On the other hand, the groove portion 10 of the support hole 10b
Since d is formed to have a width L through which the reel shaft 31 can be inserted, one end side of the reel shaft 31 can be removed from the side plate 11 via the groove portion 10d. It can be removed from between 11. To attach the reel blade 30, the procedure reverse to the above may be performed.

Thus, both side plates 10, 11 are
Remains the same without being removed from the main housing 2,
The reel blade 30 can be removed from between the side plates 10 and 11 only by removing the bearing holder 34 on one end side of the reel shaft 31 from the side plate 10. Since it is not necessary to disassemble the periphery of the rotation support portion to a considerable extent, the reel blade 30 can be replaced more easily than before.

Further, since the lid 8 is provided on the side wall of the main body housing 2 on the side of the driven pulley 36, the side of the driven pulley 36 is opened by opening the lid 8, and the transmission belt is thereby opened. The work of attaching and detaching 37 can be easily performed from the side. Here, in this type of lawnmower, the drive pulley 25 and the driven pulley 36, around which the transmission belt 37 is normally wound, are provided in the gap between the side wall 2b of the main body housing 2 and the side plate 10 as shown in FIG. Therefore, if the illustrated lid 8 is not provided, the reel blade 30
In order to remove the transmission belt 37 for the replacement, it is necessary to turn the lawn mower 1 upside down. In this respect,
According to the illustrated lawnmower 1, since the work of removing and attaching the transmission belt 37 can be performed from the side, it is not necessary to turn the lawnmower 1 upside down, and the normal posture with the wheels 4, 4, 5 grounded Thus, the transfer belt 37 can be easily attached and detached, and in this respect also, the reel blade 30 can be replaced easily.

Further, since the driven pulley 36 is provided with through holes 36a to 36a for screw tightening in accordance with the positions of the screws 35 to 35 for fixing the bearing holder 34 to the side plate 10, the through holes 36a are formed. Through 36a,
The screws 35 to 35 for fixing the bearing holder 34 can be loosened or tightened by a screwdriver tool, whereby the driven pulley 36 is not removed from the reel shaft 31.
Only the bearing holder 34 can be removed from the side plate 10, and in this respect also, the replacement work of the reel blade 30 can be further simplified.

Further, the blade height adjusting lever 7 provided on the upper surface 2a of the main body housing 2 is provided only at one position in the widthwise center of the upper surface 2a, and the position of this one lever 7 can be changed. Thus, the height position of the pair of left and right front wheels 4, 4, that is, the blade height can be adjusted. Therefore, the user of the lawnmower 1 can adjust the blade height with one hand, and in this respect, the operability (usability) of the lawnmower 1 is better than before.

Conventionally, for example, as disclosed in Japanese Utility Model Publication No. 61-34976, a pair of left and right front wheels are provided with blade height adjusting levers, and the blade height is adjusted by adjusting the positions of both levers. It was a composition. For this reason, it is necessary to adjust the position of both levers at once with both hands, or to adjust the position separately for the left and right with one hand, so the blade height adjustment is cumbersome and not easy to use. According to the lawnmower 1 of the form, there is no such problem.

[Brief description of drawings]

FIG. 1 is an overall side view of a lawnmower.

FIG. 2 is a view showing an embodiment of the present invention, and is a side view showing a partial internal structure of the lawn mower in a cutaway manner.

FIG. 3 is a view of the lawnmower viewed from the lower surface side.

FIG. 4 is a view of the lawn mower as seen from the lower surface side and is a detailed view of the periphery of the driving force transmission system between the electric motor and the reel blade.

5 is a view taken along the line (5)-(5) of FIG. 4 and is a side view of the support hole.

FIG. 6 is a plan view of the tip of the main body housing, showing the periphery of the blade height adjusting lever.

FIG. 7 is a sectional view taken along line (7)-(7) of FIG. 6 and is a side view showing a blade height adjusting lever and its supporting structure.

[Explanation of symbols]

1 ... Lawn mower 2… Main body housing 2a ... top surface, 2b ... left side wall, 2c ... right side wall 3 ... Operation handle 4 ... front wheel, 5 ... rear wheel 7: Blade height adjustment lever 8 ... Lid 10 ... Left side plate 10b ... Support hole, 10c ... Circular hole, 10d ... Groove 20 ... Electric motor 30 ... Reel blade, 31 ... Reel shaft 34 ... Bearing holder 36: driven pulley, 40: fixed blade

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) A01D 34/53 A01D 34/47

Claims (3)

(57) [Claims] 1. A reel blade support structure in which both ends of a reel shaft are rotatably supported through a bearing between a pair of left and right side plates mounted along both side walls of a main body housing, wherein one end of the reel shaft is A bearing for rotatably supporting is attached to a circular hole portion of a keyhole-shaped supporting hole formed by cutting from a lower end of one side plate through a bearing holder which is removable in the axial direction of the reel shaft, and a groove portion of the supporting hole. Is set so that the reel shaft can be inserted therethrough, the reel blade supporting structure in a lawn mower. 2. The support structure according to claim 1, wherein a driven pulley, on which a transmission belt is mounted between the driven pulley and the drive pulley, is attached to one end side of the reel shaft, which is closer to the front end side than the bearing holder. A reel blade support structure characterized in that an openable and closable lid is provided on a side wall of a main body housing on a side of a driven pulley. 3. The support structure according to claim 2, wherein the driven pulley is provided with a screw fastening hole in accordance with a position of a screw for fixing the bearing holder to the side plate. Construction.