JPH0722040U - Backpack work machine - Google Patents

Abstract

(57) [Abstract] [Purpose] Effectively shuts off the vibration generated by the operation of the power source so that it is not transmitted to the operator's back.
Provide a backpack-type working machine that does not interfere with starting operations. A power source 7 which is unavoidably vibrated by its operation is provided by being suspended from a backpack 5 via an elastic body 23, and the power source 7 is fixed when the backpack 5 is installed. Power source fixing means 27-14-18, 28-
29-14-18.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a backpack-type working machine equipped with a power source that is unavoidable to generate vibrations during its operation, and in particular, prevents the vibrations from being transmitted to the operator's back and starts the power source. It relates to a backpack-type working machine that is designed to facilitate

[0002]

[Prior art]

 A backpack-type working machine in which an internal combustion engine or a motor as a power source is mounted on a backpack carried by a worker is known. For example, working machines such as backpack type brush cutters and power sprayers.

In such a working machine, in order to prevent the vibration generated due to the operation of the power source from being directly transmitted to the worker via the backpack, the rubber is provided between the power source and the backpack. An elastic body such as a spring or a spring is used as a cushion material.

As a method of attaching the power source to the backpack, conventionally, the cushion material is interposed between the power source support base that supports the power source and the backpack, and the power source is mounted on the backpack. Installed on the back (for example, see Japanese Utility Model Laid-Open No. 3-9126), or one in which the upper and lower sides of the power source are mounted on the backpack via cushioning materials (for example, Japanese Utility Model Laid-Open No. 4-926). No. 113751) is proposed.

[0005]

[Problems to be solved by the device]

 However, it cannot be said that the conventional ones as described above have sufficient anti-vibration properties, and the anti-vibration effects that soften the vibrations as much as possible and eliminate the adverse effects on the human body due to the transmission of vibrations and the discomfort of workers as much as possible. There was a desire for a taller backpack work machine.

For this reason, it has been proposed to suspend the power source from the backpack via a cushion material on the upper part thereof, but with this, there is too much freedom of displacement, and starting operation is extremely difficult. There were drawbacks such as

The present invention was created in view of the above circumstances, and its problem is to connect the power source and the backpack to the backpack. The point is whether operability can be improved while effectively mitigating the vibration of the power source transmitted.

[0008]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the backpack-type working machine according to the present invention has a structure in which a power source that inevitably vibrates with its operation is suspended from a backpack via an elastic body. When the backpack is grounded, it is brought into contact with the ground plane and pushed up, and a power source fixing means for fixing the power source between the ground plane and the backpack is provided.

[0009]

[Action]

 According to the working machine of the present invention, since the power source (for example, an internal combustion engine) that causes vibration is suspended from the backpack via the elastic body, the vibration of the power source occurs at the elastic body. Be cut off. Therefore, almost no vibration is transmitted to the backpack.

As described above, for example, the transmission of vibrations associated with the operation of the internal combustion engine to the backpack is blocked at the elastic body, but on the other hand, when the engine is started by the recoil starter, the engine is Since it swings greatly, it is inconvenient.

Therefore, focusing on the fact that the start of the engine by the recoil starter is usually carried out by grounding the backpack on the ground or the like, and when the backpack is grounded, it is brought into contact with the grounding surface and pushed up. An engine fixing means for fixing the engine is provided between the ground contact surface and the backpack so that the engine is fixed when the engine is started and the operation is easy.

[0012]

【Example】

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

FIG. 1 is a partially cutaway side view showing a power sprayer as an example of a backpack-type working machine according to the present invention. It should be noted that description and illustration of parts that are not related to the gist of the present invention are omitted.

The power sprayer shown includes a tank 1 for containing pesticides for spraying, and the tank 1 itself is integrally molded of an appropriate synthetic resin material and is carried on the back of a worker by a backpack band 5a. It also serves as a backpack.

That is, the tank 1 is swelled at its upper portion to be suitable for storing a large amount of the agricultural chemicals and the like, and is squeezed so that a substantially middle portion in the vertical direction is biased forward. A foot portion 2 that horizontally extends rearward is formed in the lower portion thereof. The foot portion 2 is provided for convenience when the power sprayer is placed on the ground or the like. A supply port 3 for the agricultural chemicals and the like is provided on the top of the tank 1 described above, and the supply port 3 can be opened and closed by a cap 4.

Appropriate smooth irregularities are formed on the front surface portion 5 of the middle portion of the tank 1 so as to fit the back of the worker, and the pair of backpack bands 5a are attached side by side on both sides.

An air-cooled two-cycle gasoline engine 7, for example, is provided as a power source in a space between the upper bulge portion 6 of the tank 1 and the foot portion 2.

In this embodiment, the engine 7 is provided so as to be suspended from the lower surface 6 a of the upper bulging portion 6 of the tank 1.

The mounting structure of the engine 7 with respect to the tank 1 will be described. The lower surface 6a of the upper bulge portion 6 of the tank 1 has a proper gap between the left and right when manufacturing the tank 1. Two through holes 8 are provided by opening. A mounting shaft 10 having a head 9 having a relatively large area is inserted into the through holes 8 and 8 from the inside of the tank 1 by opening the cap 4. Male screws are formed on the shaft bodies 10a, 10a of the mounting shafts 10, 10, respectively. A thin nut 11 for fixation is screwed to the root of the shaft body 10a of each mounting shaft 10 protruding from each through hole 8 to the outside of the tank 1. It is fixed to the tank 1 so that the meat of the tank 1 is sandwiched from inside and outside between the thin nut 11 and the thin nut 11. A leak preventing seal member 12 is interposed between the head portion 9 of the mounting shaft 10 and the inner lower surface of the tank 1.

A first mounting member 14, a flat washer 15, and a spring washer 16 are attached to each of the mounting shafts 10 in this order on the thin nut 11 via a rubber grommet 13. They are superposed and finally tightened by the nut 17.

Each of the rubber grommets 13 is an elastic body as a vibration absorbing material that prevents the vibration that is inevitably generated by the operation of the engine 7 from being directly transmitted to the tank 1 side. It has an insertion hole for inserting a through hole in the central portion in the width direction.

The first mounting member 14 serves to suspend the engine 7 from the tank 1. The first mounting member 14 is formed by, for example, bending a flat metal plate into a substantially V shape as a whole, and has two insertion holes for inserting the mounting shaft 10 on the upper end portion 14a side. However, a horizontal portion 14b is formed by bending straightly downward from the substantially central portion thereof and at the lower end portion side thereof.

The position at which the upper end portion 14a of the first mounting member 14 is connected to the mounting shaft 10 may be located right above the center of gravity of the engine 7 as a whole.

A horizontal portion 18 a formed on the upper end side of the second mounting member 18 is superposed from below on the horizontal portion 14 b on the lower end side of the first mounting member 14. The second mounting member 18 is formed by arranging a slender flat metal plate so as to extend in the vertical direction, the horizontal portion 18a is bent and formed on the upper end side thereof, and the lower end portion 18c thereof is formed on the engine 7. It is fixed.

The horizontal portions 14 b and 18 a of the first and second mounting members 14 and 18 are provided with holes 19 and 20 which are aligned with each other, and these aligned holes 19 and 20 are aligned with each other. The headed bolt 21 is inserted from below. A cylindrical compression coil spring 23, which is an elastic body, is attached as a vibration absorbing material to the shaft portion 22 of the headed bolt 21 that protrudes above the horizontal portion 14b, and the shaft portion 22 has a tip end thereof. A nut 24 having a diameter larger than that of the compression coil spring 23 is screwed in. The lower surface of the nut 24 and the upper surface of the horizontal portion 14b of the first mounting member 14 both act as spring seats for the compression coil spring 23.

It should be noted that the compression coil spring 23 is required to have a strength that still has a spring force even when the load of the engine 7 is applied. Further, the hole 19 of the horizontal portion 14b of the first mounting member 14 needs to have a diameter sufficiently larger than that of the shaft portion 22 of the headed bolt 21.

The engine 7 is fixed to the lower end portion 18c of the second mounting member 18 by an appropriate means such as screwing, and as a result, the engine 7 is compressed from the lower surface 6a of the tank 1 to the compression member. It is in the form of being suspended and supported by a pair of left and right headed bolts 21, 21 via a coil spring 23.

That is, the load of the engine 7 is applied to the second mounting member 18, and the second mounting member 18 and the headed bolt 21 are pulled downward by the load of the engine 7. Here, the compression coil spring 23 is interposed between the nut 24 on the tip end side of the shaft portion 22 of the headed bolt 21 and the horizontal portion 14b of the first mounting member 14. . Therefore, the compression coil spring 23 is compressed by the load of the engine 7, and the elastic force of the compression coil spring 23 supports the engine 7 in a state of floating in the air (see FIG. 1).

As a result, even if the engine 7 vibrates due to the operation of the engine 7, the compression coil spring 23 absorbs or alleviates the vibration, and the vibration is transmitted to the tank 1 side. There is no such thing. In particular, unpleasant vibrations that are inevitably generated with the operation of the engine 7 are completely cut off.

The hole 19 of the horizontal portion 14 b of the first mounting member 14 has a diameter sufficiently larger than that of the shaft portion 22 of the headed bolt 21, and the headed bolt 21 and the first mounting member 14 are connected to each other. Are not in contact with each other, the vibration of the headed bolt 21 is not transmitted to the first mounting member 14.

Further, since the rubber grommet 13 is interposed between the first mounting member 14 and the tank 1, the vibration absorbing effect is further enhanced.

By the way, in the power sprayer, there is no problem if the power source is a motor or the like that is started by a switch operation, but as in the present embodiment, it is started by a recoil starter as the power source. When the internal combustion engine 7 is adopted, it is inconvenient to pull the starter handle 25 strongly to start the engine 7 because the engine 7 is suspended and supported.

In view of this, in the present invention, engine fixing means for fixing the engine 7 by contacting the ground surface when the backpack is grounded is provided.

That is, it should be noted that starting the engine by the recoil starter is normally performed by grounding the tank 1 to the ground or the like, and when the tank 1 is grounded, the engine 1 is contacted with the ground surface 26. The engine fixing means for temporarily fixing 7 is provided so that the engine 7 is fixed when the engine is started.

Specifically, as shown in FIGS. 1 and 2, through a through hole 2 b formed in the foot portion 2 of the tank 1 with play, from a bottom surface 2 a of the foot portion 2 to a lower end thereof. A bar member 27 having a downwardly projecting 27a is fixed to the engine 7. The protruding length of the lower end 27a of the bar member 27 from the bottom surface 2a of the foot portion 2 is determined by the flat surface portion 14b of the first mounting member 14 and the second mounting member 18 when the tank 1 is lifted. The length is approximately equivalent to the distance L between the flat portion 18a and the flat portion 18a.

According to the above, when the tank 1 is placed on a flat surface such as the ground 26 when the engine 7 is started by the recoil starter, the rod protruding downward from the bottom surface 2 a of the foot portion 2 The lower end 27a of the material 27 is pushed by the ground 26 or the like and pushed up. Then, the engine 7 is lifted upward by the protruding length of the rod 27, and the horizontal portion 14b of the first mounting member 14 and the horizontal portion 18a of the second mounting member 18 are in close contact with each other. (See FIG. 2).

As a result, the engine 7 is configured such that the lower surface 6 a of the upper bulge portion 6 of the tank 1 and the ground contact surface such as the ground are connected via the first and second attachment members 14 and 18 and the rod member 27. It is fixed so as to be sandwiched from above and below with 26. Therefore, even if the starter handle 25 of the recoil starter of the engine 7 is strongly pulled and the start operation is performed, the engine 7 does not rock, and the start operation can be stably performed.

If an appropriate gap is provided between the through hole 2b of the foot portion 2 of the tank 1 and the rod member 27 penetrating through the through hole 2b, the engine 7 of the engine 7 can be operated during the work. The vibration is not transmitted to the foot portion 2 of the tank 1 via the rod member 27.

In order to fix the engine 7 more reliably, the rod member 27 and the through hole 2b of the foot portion 2 are formed in such a shape that they are prevented from rotating with each other. It is desirable to provide an engaging portion 18b that engages with the horizontal portion 14b of the first mounting member 14 at the upper end of the attachment member 18.

3 to 4 show another specific example of the engine fixing means.

In this example, a short rod 28 is provided so as to project downward from the bottom of the engine 7, and the foot 2 of the tank 1 is provided with the rod 2 when the tank 1 is grounded. An engine fixture 29 is provided which is in contact with the material 28 and pushes up the engine 7 via the rod 28.

The engine fixture 29 is substantially cup-shaped, has a node portion 30 that abuts the lower end 28 a of the rod 28 inside, and has a foot portion of the tank 1 on the outer periphery thereof. It has a flange 31 that prevents the flange 2 from falling downward.

When the tank 1 is lifted, the engine fixture 29 is lowered by its own weight or the urging force of a spring (not shown), and a part thereof is projected downward from the lower surface 2a of the foot portion 2 of the tank 1. However, it remains in the foot portion 2 of the tank 1 at the flange 31. Then, when the tank 1 is grounded to the ground or the like, the engine fixing tool 29 is pushed up by the grounding surface 26 and moves upward, and the lower end 28a with the cushion material of the bar material 28 is lifted at the node portion 30. The engine 7 is pushed up via the above to fix the engine 7 (see FIG. 4).

Since an appropriate gap is provided between the rod 28 and the inner circumference of the engine fixture 29, even if the engine 7 is started and the tank 1 is lifted, the engine 7 The vibration is not transmitted to the foot portion 2 of the tank 1 via the engine fixture 29.

In the above description, the power sprayer in which the tank doubles as a backpack is taken as an example, and the engine is suspended and supported from the tank. However, the scope of application of the present invention is as follows. The present invention is not limited to the type of power sprayer shown in the example, but can be applied to any backpack type working machine equipped with a power source.

[0046]

[Effect of device]

 According to the present invention, the transmission of the vibration generated by the operation of the power source (for example, the internal combustion engine) is effectively blocked by the elastic body and is not transmitted to the backpack that comes into contact with the worker's back, so that the worker is comfortable In addition to being able to perform work on the engine, when the engine is started by the recoil starter, etc., the suspended engine can be temporarily fixed if the backpack is grounded. There is no hindrance.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a main body of a power sprayer according to an embodiment of the present invention.

FIG. 2 is a partially cutaway side view of a main part of the main body of the power sprayer shown in FIG.

FIG. 3 is an explanatory diagram showing another example of the power source fixing means.

FIG. 4 is an explanatory diagram showing an operating state of the power source fixing means shown in FIG.

[Explanation of symbols]

 1 backpack 7 power source 23 elastic body 26 grounding surface 27-14-18 power source fixing means 28-29-14-18 power source fixing means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Tadashi Ishimura 1-7-2 Suehiro-cho, Ome-shi, Tokyo 2 Kyoritsu Co., Ltd. (72) Kazutoshi Mori 1-7 Suehiro-cho 2, Ome-shi, Tokyo 2 Kyoritsu Co., Ltd. Within

Claims (1)

[Scope of utility model registration request] 1. A backpack-type working machine in which a power source (7) which inevitably vibrates with its operation is provided by being suspended from a backpack (1) through an elastic body (23), Power that abuts against the grounding surface (26) and is pushed up when the backpack (1) is grounded, and that fixes the power source (7) between the grounding surface (26) and the backpack (1). A backpack type working machine comprising a source fixing means (27-14-18, 28-29-14-18).