JP3295601B2 - Power sprayer shutter adjuster - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power adjusting device for adjusting a shutter of a power spreader, and more particularly to a power spreader in which a mechanism of a shutter adjusting device for adjusting a discharge amount of a spraying agent in a power spreader carried by an operator is simplified. The present invention relates to a shutter adjusting device for a machine.

[0002]

2. Description of the Related Art Conventionally, a power sprayer used for spraying powdery or granular chemicals or the like on grass, turf, trees, etc. is driven by an engine and an engine on a frame carried by an operator. It has a blower, a spraying agent tank for storing a spraying agent such as a medicine blown by the blower, a flexible pipe connected to the blower, and a spray tube connected to the flexible pipe. Such a power spraying machine is provided with a shutter as a metering valve for adjusting the spraying amount between the spraying agent tank and the blower, and the opening degree of the shutter is manually operated by the spraying operator during work. The shutter can be adjusted by a shutter adjusting device which can be adjusted.

A conventional shutter adjusting device is connected to an operation lever provided on a side surface of a backpack frame by a link mechanism attached to a rotation shaft of a shutter, and is connected to a discharge port of a blower by a lever operation of an operator. The discharge amount of the spraying agent from the sprayed flexible pipe can be adjusted. On the other hand, in this shutter adjusting device, in order to set the maximum opening degree of the shutter according to the properties of the medicine or the like to be sprayed, the lever ratio of the link arm fixed to the rotating shaft of the shutter is changed. I have. The change of the lever ratio in this link mechanism is performed by changing the connection position of the intermediate rod bridged between the link arm on the rotation axis side of the shutter and the lever arm on the operation lever side to the link arm. .

To change the connection position of the intermediate rod to the link arm, a structure in which the rotating shaft of the shutter is fixed to the link arm by a tightening knob so that the position can be adjusted, or a plurality of mounting holes are provided on the link arm side, A structure in which the end of the intermediate rod is inserted into one of the plurality of mounting holes and stopped with a locking pin has been conventionally employed.

However, in the former structure, the number of parts is large and it takes time to manufacture, and in the latter structure, the locking pin is removed when adjusting the lever ratio, so that the locking pin may be eliminated.

Therefore, a longitudinal slot including a small slot portion and a large slot portion is formed in the link arm, and a large-diameter portion which can be fitted into the large slot portion is provided at a portion of the end of the intermediate rod inserted into this slot. And a small-diameter portion that can pass through the small slot portion, and a spring is provided at the end of the intermediate rod to bias the intermediate rod in a direction in which the large-diameter portion fits into the large slot of the link arm. (See Japanese Utility Model Laid-Open No. 4-57255).

[0007]

However, the device described in Japanese Utility Model Laid-Open No. 4-57255 discloses a device in which the intermediate rod is biased by a spring provided at the end of the intermediate rod and a small slot is provided in the link arm. Since it is necessary to form a longitudinal slot including a portion and a large slot portion, there is a problem that the structure of the portion for changing the lever ratio of the link arm is complicated, resulting in an increase in cost.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a shutter adjusting device for a power spreader in which the structure of a portion for changing a lever ratio of a link arm is simple and the cost can be reduced. I have.

[0009]

According to a first aspect of the present invention, there is provided a shutter adjusting device for a power spreader, comprising: a backpack type frame; a spraying agent tank for storing the spraying agent; And a shutter for adjusting the flow rate of the spraying agent provided between the spraying agent tank and the blower in a power sprayer equipped with an engine for driving a blower fan housed in the blower. Is connected to an operation lever provided on the side surface of the backpack frame by a link mechanism attached to the rotating shaft of the sprayer, and the operation of this lever causes the discharge amount of the spraying agent from the spraying flexible pipe connected to the blower outlet In the shutter adjusting device of the power spreader configured to be able to adjust the force, the link arm attached to the rotation shaft of the shutter of the link mechanism is provided with the link arm. A plurality of rod mounting holes capable of changing the amount of movement of the arm are provided, and one end is connected to a support shaft of the operation lever, and the other end is selectively connected to one of the rod mounting holes. Are provided with means for preventing the intermediate rod from coming off easily from the link arm.

[0010] The means for preventing the intermediate rod from coming off includes a tension spring that is stretched between the intermediate rod and a backpack type frame or a backpack mounted frame, a torsion spring attached to a support shaft of an operation lever, Alternatively, it may be a magnet provided in the rod mounting hole of the link arm.

According to the shutter adjusting device of the power spreader of the present invention, the intermediate rod is urged toward the link arm by a simple mechanism. Since only one mounting hole is needed,
The structure of the shutter adjusting device of the power spreader is simplified.

[0012]

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

FIG. 1 is a side view of a power sprayer 5 to which a shutter adjusting device 10 according to an embodiment of the present invention is attached. The power sprayer 5 includes an L-shaped backpack frame 1 having a backrest 9 provided on a front surface thereof, a blower 3 having a spraying agent tank 2 mounted thereon, an engine 4 for driving the blower 3, and an engine. Four fuel tanks 8 are mounted. FIG. 1 does not show a backpack band for carrying the backpack type frame 1.

The spraying agent tank 2 stores a powdery and granular spraying agent such as a chemical for grass, lawn and trees. Spray agent tank 2
Although a detailed description is omitted, a well-known pressurizing passage 20 is provided between the blower 3 and the blower 3 that blows the spray agent in the tank 2, and spraying from the tank 2 by the pressurized air from the blower 3. The agent is blown. A shutter 6 for adjusting the flow rate of the spraying agent from the tank 2 is provided in the pressurizing passage 20. A blower fan (not shown) is provided in the blower 3, and the rotation axis of the blower fan is rotated by the engine 4.

The rotary shaft 7 of the shutter 6 housed in the pressurizing passage 20 is drawn out to the front side of the pressurizing passage 20 and is connected to the shutter adjusting device 10. The shutter adjusting device 10 in this embodiment includes a link arm 11 attached to the rotating shaft 7 of the shutter 6, an intermediate rod 13 connected to the link arm 11, and an intermediate rod 1
The control lever 3 includes a lever arm 14 that connects the support shaft 15 of the operation lever 16 to the support lever 15 and an operation lever guide 17. The operation lever guide 17 is attached to the side of the backpack type frame 1, and a grip 16G of the operation lever 16 is provided.
Project from the front side of the operation lever guide 17 (the side of the worker carrying the power sprayer 5). In this embodiment, the intermediate rod 13 attached between the link arm 11 and the lever arm 14 is a tension spring that is bridged between the intermediate rod 13 and a bracket 19 attached to the cover of the blower 3. 21 is urged toward the blower 3 side.

FIG. 2 shows the shutter adjusting device 1 shown in FIG.
In this example, the back support 9 and the frame 1 of the power spreader 5 shown in FIG. 1 are removed to expose the shutter adjusting device 10. FIG. 2 shows a mounting position of a flexible pipe 30 for spraying connected to a discharge port of the blower 3. FIG. 3 is a perspective view showing only the shutter adjusting device 10 shown in FIG. 2 and showing the entire configuration of the mechanism.

As shown in FIGS. 2 and 3, one end of the rotating shaft 7 of the shutter 6 for adjusting the flow rate of the spraying agent is fixed to one end of a link arm 11 on the front side of the blower 3. A plurality of rod mounting holes 12 are formed in the link arm 11 in the longitudinal direction, and the L-shaped tip portion 13a of the intermediate rod 13 is inserted into any of the rod mounting holes 12. . Then, the L-shaped tip portion 13 of the intermediate rod 13
Depending on which rod mounting hole 12 a is inserted into, the lever ratio is changed and the operation amount of the link arm 11 is changed. Therefore, the L-shaped tip portion 13a of the intermediate rod 13 is inserted into any one of the rod mounting holes 12 in a state where it can be easily inserted into and removed from the rod mounting hole 12.

On the other hand, a base 13b of the intermediate rod 13 is rotatably mounted on one end of a lever arm 14, and the other end of the lever arm 14 is fixed to a support shaft 15 of an operation lever 16. The support shaft 15 is rotatably supported by a bracket 25 attached to a cover of the blower 3.
The operation lever 16 is connected to the support shaft 1 via the elbow 15a.
5 is fixed. Further, the shaft of the operation lever 16 is inserted through an elongated hole-shaped guide groove 18 provided in the operation lever guide 17, and is inserted into one of the locking grooves 18 a provided continuously with the guide groove 18. Locked. A grip 16G is attached to a free end of the operation lever 16.

In this embodiment, the link arm 11
A plurality of rod mounting holes 12 are drilled only on the link arm 11 side in order to change the operation amount, but in order to further finely set the maximum supply amount of the spraying agent, the lever arm side is also formed. Mounting holes for a plurality of rod bases may be formed so that the mounting position of the base 13b of the intermediate rod 13 to the lever arm 14 can be changed.

In the shutter adjusting device 10 configured as described above, in this embodiment, one end of a tension spring 21 is attached to a predetermined position of the intermediate rod 13. The other end of the tension spring 21 is locked by a bracket 19 attached to a cover of the blower 3. Therefore, in a normal state, the intermediate rod 13 is urged toward the blower 3 by the tension spring 21 serving as a means for preventing the intermediate rod from being bridged between the intermediate rod 13 and the bracket 19. Therefore, the operating lever 16 is moved by the operator in a normal state, and the operating lever guide 1 of the operating lever 16 is moved.
Even when the locking position of the locking groove 18a in the guide groove 18 of 7 is changed, there is no concern that the L-shaped tip portion 13a of the intermediate rod 13 will fall out of the rod mounting hole 12.

The operation for changing the operation amount of the link arm 11 will now be described. Now, the intermediate rod 13
However, as shown by a dashed line in FIG.
Assume that a has been inserted into the rod mounting hole 12 located farthest from the rotation shaft 7 of the shutter 6 of the link arm 11. In order to change the operation amount of the link arm 11 from this state, when the insertion position of the L-shaped tip portion 13a of the intermediate rod 13 into the rod mounting hole 12 is changed, the tension spring 21
It is only necessary to pull out the L-shaped tip portion 13a of the intermediate rod 13 from the rod mounting hole 12 and insert it into another rod mounting hole 12 against the urging force. Then, the intermediate rod 13
The L-shaped tip portion 13a is not separated from the rod mounting hole 12 by the urging force of the tension spring 21.

As described above, according to the shutter adjusting device 10 of this embodiment, the lever ratio of the link arm 11 can be easily changed, and the structure of the shutter adjusting device 10 can be simplified to reduce the cost. .

FIG. 4 shows another embodiment of the means for preventing the intermediate rod 13 from coming off in the shutter adjusting device 10 of the power spreader according to the present invention. In this embodiment, FIGS.
The same components as those described with reference to FIG. 3 are denoted by the same reference numerals.

FIG. 4 shows the link arm 11 and the intermediate rod 1.
3 is partially enlarged to show a connection portion with the L-shaped tip portion 13a. In FIG. 4, the illustration of the rotary shaft 7 of the shutter is omitted, and only the mounting hole 11a of the rotary shaft of the shutter is shown.

In this embodiment, a magnet mounting hole 11b having a large diameter is provided at a position where the rod mounting hole 12 of the link arm 11 in the above-described embodiment is provided. A ring magnet 22 having the same plate thickness is fitted.
The rod mounting hole 12 is provided in the center of the ring magnet 22.

The ring magnet 22 is connected to the link arm 1
By magnetizing one magnetic pole (for example, S-pole) on the front side and the other magnetic pole (for example, N-pole) on the back side, even if the intermediate rod 13 rotates with respect to the link arm 11, There is no change in the attraction force.

Since the intermediate rod 13 is made of iron, the L-shaped tip 13a of the intermediate rod 13 is
2, the L-shaped tip 13 a of the intermediate rod 13 is inserted into the ring magnet 22.
, It will not easily fall out of the rod mounting hole 12.

In this embodiment, the intermediate rod 1
The L-shaped tip portion 13a of the third magnet portion 2 has a polarity magnet portion 2 which attracts the ring magnet 22 to each other at a position facing the ring magnet 22 when inserted into the rod mounting hole 12.
2a, the L-shaped tip 13 of the intermediate rod 13 is provided.
a becomes more difficult to come out of the rod mounting hole 12 due to the attraction force of the magnet portion 22a and the ring magnet 22.

As described above, in the shutter adjusting device 10 of this embodiment in which the rod mounting hole 12 is formed by the ring magnet 22, the lever ratio of the link arm 11 can be easily changed, and the structure of the shutter adjusting device 10 can be easily changed. However, cost can be reduced simply.

FIG. 5 shows another embodiment of the means for preventing the intermediate rod 13 from coming off in the shutter adjusting device 10 of the power spreader according to the present invention. In this embodiment, the same components as those described in FIGS. 1 to 4 are denoted by the same reference numerals.

FIG. 5 is a partially enlarged view of a connection portion between the base portion 13b of the intermediate rod 13 and one end of the lever arm 14.

Accordingly, in FIG. 5, reference numeral 15 denotes a support shaft of the operation lever 16 fixed to the other end of the lever arm 14. In the embodiment described with reference to FIGS.
The base 13b is simply rotatably attached to one end of the lever arm 14 in a state where it is prevented from coming off. on the other hand,
In this embodiment, the base 13 b of the intermediate rod 13 is rotatably attached to one end of the lever arm 14 via a torsion coil spring 23.

The torsion coil spring 23 is connected to the intermediate rod 13
After the base 13b is inserted through one end of the lever arm 14, the base 13b and the base 1
3b is interposed between the stopper plate 24 attached to the distal end of the lever arm 14 and one end thereof is engaged with the stopper plate 24, and the other end is engaged with a spring engagement hole 14a provided in the lever arm 14. ing. In this state, the torsion coil spring 23 applies a biasing force to the intermediate rod 13 in the clockwise direction.

That is, the L-shaped tip of the intermediate rod 13 is moved by the torsion coil spring 23
Will receive the biasing force in the direction of pressing. Therefore, the L-shaped tip portion 13 a of the intermediate rod 13 is not easily removed from the rod mounting hole 12 by the biasing force of the torsion coil spring 23.

As described above, the base 13b of the intermediate rod 13
Also in the shutter adjusting device 10 of this embodiment, in which the torsion coil spring 23 is interposed, the lever ratio of the link arm 11 can be easily changed, and the structure of the shutter adjusting device 10 is simple to reduce the cost. Can be planned.

[0036]

As described above, according to the present invention,
In the shutter adjusting device of the power spreader, the lever ratio of the link arm can be easily changed, and the structure of the portion where the lever ratio is changed is simple, so that the cost of the power spreader can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view of a power spreader to which a shutter adjusting device of the present invention is attached.

FIG. 2 is an explanatory view showing a configuration of the shutter adjusting device by removing a back plate and a frame of the power spreader of FIG. 1 to which the shutter adjusting device of the present invention is attached.

FIG. 3 is a perspective view showing the overall configuration of an embodiment of the shutter adjusting device of the power spreader according to the present invention.

FIG. 4 is a partially enlarged perspective view showing the configuration of another embodiment of the means for preventing the intermediate rod from coming off in the shutter adjusting device of the power spreader according to the present invention.

FIG. 5 is a partially enlarged perspective view showing the configuration of still another embodiment of a means for preventing the intermediate rod from coming off in the shutter adjusting device of the power spreader of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Backpack type frame 2 Spray agent tank 3 Blower 4 Engine 5 Power sprayer 6 Shutter 7 Rotation axis of shutter 10 Shutter adjustment device of the present invention 11 Link arm 11a Rotating shaft mounting hole 11b Magnet mounting hole 12 Rod mounting hole 13 Intermediate rod 13a L-shaped tip 13b base 14 lever arm 15 support shaft 16 operating lever 17 operating lever guide 18 guide groove 19 bracket 21 tension spring 22 ring magnet 23 torsion coil spring 24 stop plate 25 bracket 30 flexible pipe

Claims (3)

(57) [Claims] 1. A backpack type frame is equipped with a spraying agent tank for storing a spraying agent, a blower for blowing the spraying agent in the tank, and an engine for driving a blowing fan housed in the blower. In the power sprayer, a shutter for adjusting the flow rate of the spraying agent provided between the spraying agent tank and the blower is provided on a side surface of the backpack type frame by a link mechanism attached to a rotating shaft of the shutter. And a shutter adjusting device of a power sprayer configured to be able to adjust the discharge amount of the spraying agent from the spraying flexible pipe connected to the discharge port of the blower by operating the lever. A plurality of rod mounting holes capable of changing an operation amount of the link arm, the link arm being mounted on a rotation shaft of the shutter of the link mechanism; And an intermediate rod having one end connected to the support shaft of the operation lever and the other end selectively attached to one of the rod attachment holes, so that the other end does not easily come off the link arm. A shutter adjusting device for a power spreader provided with means for preventing detachment of an intermediate rod, wherein the means for preventing detachment of the intermediate rod comprises the intermediate rod,
A shutter adjusting device for a power spreader, characterized in that it is a tension spring spanned between said backpack type frame and said backpack type frame mount. 2. A backpack-type frame is equipped with a spraying agent tank for storing a spraying agent, a blower for blowing the spraying agent in the tank, and an engine for driving a blowing fan housed in the blower. In the power sprayer, a shutter for adjusting the flow rate of the spraying agent provided between the spraying agent tank and the blower is provided on a side surface of the backpack type frame by a link mechanism attached to a rotating shaft of the shutter. And a shutter adjusting device of a power sprayer configured to be able to adjust the discharge amount of the spraying agent from the spraying flexible pipe connected to the discharge port of the blower by operating the lever. A plurality of rod mounting holes capable of changing an operation amount of the link arm, the link arm being mounted on a rotation shaft of the shutter of the link mechanism; And an intermediate rod having one end connected to the support shaft of the operation lever and the other end selectively attached to one of the rod attachment holes, so that the other end does not easily come off the link arm. A shutter adjusting device for a power spreader provided with means for preventing detachment of an intermediate rod, wherein the means for preventing detachment of the intermediate rod is a torsion spring attached to a support shaft of the operation lever. Shutter adjustment device for power spreader. 3. A backpack type frame is equipped with a spraying agent tank for storing the spraying agent, a blower for blowing the spraying agent in the tank, and an engine for driving a blowing fan housed in the blower. In the power sprayer, a shutter for adjusting the flow rate of the spraying agent provided between the spraying agent tank and the blower is provided on a side surface of the backpack type frame by a link mechanism attached to a rotating shaft of the shutter. And a shutter adjusting device of a power sprayer configured to be able to adjust the discharge amount of the spraying agent from the spraying flexible pipe connected to the discharge port of the blower by operating the lever. A plurality of rod mounting holes capable of changing an operation amount of the link arm, the link arm being mounted on a rotation shaft of the shutter of the link mechanism; And an intermediate rod having one end connected to the support shaft of the operation lever and the other end selectively attached to one of the rod attachment holes, so that the other end does not easily come off the link arm. What is claimed is: 1. A shutter adjusting device for a power spreader provided with an intermediate rod disengagement preventing means, wherein the intermediate rod disengagement preventing means is a magnet provided in a rod mounting hole of the link arm. Machine shutter adjustment device.