JPS5917413Y2 - Power pest control machine backrest - Google Patents

Description

[Detailed explanation of the invention] In backpack-powered exterminators equipped with a small and lightweight internal combustion engine, such as a small two-stroke engine, the engine attached to the fan case rotates at high speed, producing high intake and exhaust noise, which can be a problem for workers. Fatigue is also very likely to increase.

The present invention focuses on the fact that it is easy to integrally mold a relatively large-volume cavity inside a conventional plastic backrest, and that it is easy to install a relatively large-volume cavity because there is a space. In one case, the purpose is to improve the intake noise silencing effect by using the body as an air cleaner case or (and) as an air suction pipe, and on the other hand, by using the large volume cavity in the sheet metal backrest as a muffler. The purpose is also to improve the exhaust noise silencing effect, which will be explained in conjunction with the drawings as follows.

FIG. 1 is a perspective view showing an example of a conventional backpack frame.A plastic backpack 1 is fixed to a bracket 3 of a backpack frame 2 via anti-vibration rubber 8. separated by an interval.

Reference numeral 4 designates a backpack belt attachment frame integrated with the backpack frame 2, 5 designates two backpack bands, and 6 and 7 brackets for mounting the power pest control machine.

As shown in FIG. 1, a conventional back support 1 is simply made of plastic such as polyethylene and integrally molded into a flat plate shape so as to fit along the back of the worker.

Reference numeral 10 in FIG. 2 is a backrest according to the present invention, and an air suction pipe 18 provided with a cavity 21 (FIG. 4) is integrally molded into a plastic body.

3 shows a longitudinal section of FIG. 2, and FIG. 4 shows a horizontal section of FIG. The discharge port 15 is connected through a pipe 16 to an air cleaner (not shown) installed in the engine.

The backrest 10 has a relatively wide width in the left-right direction, and the volume of the cavity 21 can be sufficiently large, so that, together with the effect of the sound-absorbing material 19, intake noise can be greatly reduced. can.

Moreover, if the air suction pipe 18 is provided near the lower end of the backrest 10 as shown in FIG. 2, the air suction port 12 will be at a position optically separated from the worker's ears, making it difficult for intake noise to be transmitted to the worker.

FIG. 5 shows another embodiment of the present invention, in which an air cleaner case 11 is provided integrally with the back support 10, and the cylindrical case 11 has a large number of air holes on the cylindrical surface opposite to the operator. A suction port 12 is provided, an element 14 such as a polyurethane foam is inserted into a cavity 21, and a discharge port 15 is connected through a pipe 16 to a carburetor (not shown) of the engine.

By providing a large number of air suction ports whose total area is the same as the area of one conventional air suction port, the diameter of each air suction port can be made smaller, which can reduce the dispersion of intake noise. This makes it difficult for intake noise to be transmitted.

FIG. 6 shows yet another embodiment of the present invention, in which a cavity 21 is provided by combining several wooden boards onto a wooden backrest (for example, a laminated board), which is simple in structure and easy to manufacture.

FIG. 7 shows another embodiment of the present invention, in which a first muffler (not shown) is attached to the engine, a second muffler 30 is provided on the backrest, and both mufflers are connected by an exhaust pipe 31. The exhaust outlet pipe 33 is made of a heat insulating material such as asbestos that also serves as a cushion and is glued to the backrest.

In this way, the exhaust noise and the temperature of the exhaust gas emitted from the muffler can be significantly reduced.

Further, by employing the first muffler, the temperature of the second muffler becomes considerably lower, so that a relatively simple heat insulating material can be used to block heat transfer to the worker's back.

Note that the exhaust pipe may be directly connected to an engine cylinder (not shown).

FIG. 10 shows another embodiment of the present invention, and FIG. 11 shows a longitudinal section of FIG. 10, in which a partition 42 is provided and an air suction chamber 4
0 and an air noise chamber 41 into which the element 14 is inserted are provided at the same time, and intake noise can be greatly reduced.

Incidentally, if a sound absorbing material is inserted into the air suction chamber 40, the intake noise can be further reduced.

Note that there is no problem in using the backrest for both intake noise reduction and exhaust noise reduction purposes at the same time.

In addition to the structure shown in Figure 1, conventional backpack frames have the structure shown in Figure 8, where the frame body is divided into upper and lower parts, and Figure 9, where the frame body is only attached to the bottom and the backpack band is fixed directly to the backrest. It is something that

In addition to the plastic material mentioned in this invention, conventional materials for back supports include wooden laminates covered with a vinyl cover, and wooden laminates and cushion rubber (placed on the side where the worker's back rests) with a vinyl cover. Some are covered with

According to the present invention, when the backrest 10, which occupies a relatively large area, is molded from plastic or the like, a cavity with a relatively large volume can be easily integrally molded inside. Alternatively, by using it in one or both of the air suction pipes 18, intake noise can be greatly reduced, and worker fatigue can also be reduced.

It is easy to manufacture because of its simple structure.

It can also be used as a wooden backrest or as a muffler.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an example of a conventional back rest, Fig. 2 is a perspective view of a back rest according to the present invention, Fig. 3 is a vertical cross-sectional partial view of Fig. 2, and Fig. 4 is a horizontal view of Fig. 2. Partial cross-sectional view, Fig. 5, Fig. 6,
Figure 7 is another embodiment of the present invention, Figures 8 and 9 are other structural diagrams of a conventional backpack frame, Figure 10 is another embodiment of the present invention, and Figure 11 is the 10th embodiment. Partial vertical cross-sectional view of the figure and its A-A
FIG. 10...Back rest, 11...Air cleaner case, 18...Air suction pipe, 2...
・Back frame.

Claims (1)

[Scope of utility model registration request] In the back support of a power exterminator, which is a flat plate that rests on the back of the worker and is connected to the back frame on which the fan case of the blower is mounted via anti-vibration rubber, a cavity is provided in the back support, and one end of the cavity or A back support for a power pest control machine, characterized in that a part of the cavity is provided with an opening to the atmosphere, and the other end of the cavity is provided with a connection port to an intake pipe or an exhaust pipe of an internal combustion engine mounted on a fan case.