Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with... – Casing having tangential inlet or outlet
Reexamination Certificate
1999-09-21
2001-06-26
Look, Edward K. (Department: 3745)
Rotary kinetic fluid motors or pumps
Working fluid passage or distributing means associated with...
Casing having tangential inlet or outlet
C415S123000, C415S200000, C415S148000, C415S915000
Reexamination Certificate
active
06250882
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a portable working machine provided with a centrifugal air blower which is designed to be driven by means of a prime mover such as an air-cooled two-stroke internal combustion engine. More specifically, this invention relates for example to a shoulder type chemicals spraying machine for performing a spraying work of chemicals, or to a shoulder type air-blowing cleaner for collecting scattered objects such as fallen leaves and dusts by making use of air to be ejected from an air blower.
The conventional portable working machine of this kind such as a shoulder type chemicals spraying machine for instance is constructed generally as seen in Japanese Utility Model Publication H5-19549. Namely, it comprises a centrifugal air blower which is mounted in an upright state on a shouldering frame having an L-shaped configuration as viewed laterally and attached with a shouldering strap, and a prime mover such as an air-cooled two-stroke internal combustion engine which is mounted on the rear side of the air blower (on the rear portion of the shouldering frame) for driving the air blower.
Further, a separate chemicals storage tank is connected via a flow rate adjusting device to an upper portion of a volute case of the air blower. The chemical in the chemicals storage tank is made to be sucked into the volute case through the flow rate adjusting device, and then, while being carried by the flowing air, ejected from an air-ejecting nozzle which is projected downward diagonally from one side (usually right side) of the volute case, the ejected chemicals being ultimately ejected into the outside atmosphere after passing through a bent pipe, a bellows type flexible pipe and a blowing pipe.
However, the aforementioned conventional portable working machine provided with a centrifugal air blower is accompanied with the following problems.
Namely, since the air inlet port of the air blower is generally formed on a back of the shouldering frame, a relatively large air intake gap for introducing air from the outside atmosphere is inevitably formed between the shouldering frame and the air blower (the volute case of the air blower). As a result, the heavy weight portions such as the air blower, the chemicals storage tank and the prime mover are displaced rearward from the back of the shouldering frame by a distance corresponding to the air intake gap. In this case, as the center of gravity of the heavy weight portions such as the air blower, the chemicals storage tank and the prime mover is located further away from the back of the shouldering frame, the working machine constituted by these heavy weight portions is more likely to be moved away from the back of the shouldering frame, so that it becomes more difficult to easily carry the working machine on an operator's back, thus deteriorating the operability and portability of the working machine.
In the case of the conventional working machine, the shouldering frame, the volute case, the chemicals storage tank, the flow rate adjusting device, etc. are generally individually manufactured in advance, and subsequently, integrally assembled. Therefore, the conventional working machine is accompanied with the problems that it requires a large number of parts, it is heavy and bulky as a whole, it is difficult to assemble, and that the manufacturing cost of the working machine is relatively high.
BRIEF SUMMARY OF THE INVENTION
This invention has been made to cope with the aforementioned problems, and therefore an object of the present invention is to provide a portable working machine provided with a centrifugal air blower, which is capable of improving the workability and portability thereof, of minimizing the number of parts and the manufacturing cost thereof, of reducing the size and weight thereof, and of simplifying the assembling work thereof.
With a view to realize the aforementioned object, this invention provides a portable working machine provided with a centrifugal air blower, which is featured in that a prime mover for rotating said air blower is mounted via a supporting coupling member on a volute case of said centrifugal air blower which is mounted in an upright state; and that an air inlet port of said air blower is positioned on the side of said volute case which is closer to said prime mover.
In a preferable embodiment of this invention, an air-intake port for introducing the outside air into the air inlet port of said air blower is formed on a portion of said supporting coupling member which is located between said air blower and said prime mover.
More preferably, a chemicals storage tank is mounted over said volute case. More preferably, said volute case and said chemicals storage tank are integrally formed by means of a blow molding for instance.
In another preferable embodiment of this invention, a rear surface portion of said volute case which is located away from said prime mover is functioned as a back of the shouldering frame. In a further preferable embodiment of this invention, a back-pad is attached to the rear surface portion of said volute case. In a still preferable embodiment of this invention, a rotational shaft of an impeller of said air blower is axially supported by a bearing portion attached to said supporting coupling member.
In another preferable embodiment of this invention, a rotational shaft of said impeller is drivingly connected via a centrifugal clutch with an output shaft of said prime mover.
In a still preferable embodiment of this invention, a flow rate adjusting device is interposed between said volute case and said chemicals storage tank, and a stand is formed underneath the bottom surface of said supporting coupling member.
According to the portable working machine provided with a centrifugal air blower of this invention which is constructed as mentioned above, since the air inlet port of the air blower is positioned on the side close to a prime mover, and at the same time, the outside air is introduced from the air-intake port which is formed in the supporting coupling member, the rear surface portion which is located away from the internal combustion engine of the air blower can be functioned as a back of the shouldering frame.
Therefore, the conventional back of the shouldering frame that has been required to be employed as the air inlet port of the air blower is disposed on the back of the shouldering frame side is no more required to be employed, and at the same time, the air intake gap is no more required to be formed between the back of the shouldering frame and the volute case of the air blower. As a result, the center of gravity of the heavy weight portions such as the air blower, the chemicals storage tank and the internal combustion engine can be placed closer to the operator's back as compared with the case of the conventional chemicals spray machine.
Accordingly, it becomes possible not to allow the working machine as a whole to be easily departed from the operator's back, thereby making it possible for the operator to easily carry the working machine on his/her back, thus improving the workability and the portability of the working machine.
Further, since the volute case, the chemicals storage tank, etc. can be integrally molded by means of a blow molding method for instance, it becomes possible to minimize the number of parts and manufacturing cost of the devices, to reduce the size and weight of the air blower, and to simplify the assembling thereof.
REFERENCES:
patent: 4120616 (1978-10-01), Dwyer et al.
patent: 4392614 (1983-07-01), Groth et al.
patent: 4809502 (1989-03-01), Iida et al.
patent: 5383427 (1995-01-01), Tuggle et al.
patent: 5975862 (1999-11-01), Arahata et al.
patent: 6004093 (1999-12-01), Ishikawa
patent: 519549 (1993-05-01), None
patent: 67802 (1994-03-01), None
Baker & Botts L.L.P.
Kioritz & Corporation
Look Edward K.
Woo Richard
LandOfFree
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