Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Reexamination Certificate
2000-03-09
2001-07-03
Moore, Chris K. (Department: 1744)
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
C015S405000
Reexamination Certificate
active
06253415
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an improvement of a knapsack engine-driven tool, such as an engine-driven sprayer or and an engine-driven spray. More particularly, the invention relates to an improved knapsack engine-driven tool having an improvement in which the starting or stopping of the engine and can be made and the rotation speed of the engine can be regulated.
2. Description of the Related Art
As shown in
FIG. 4
explaining prior art, the operating portion of the conventional knapsack engine-driven tool E has a knapsack frame A having an engine mounted thereon. The engine is equipped with the frame via a coil spring as a supporting member at a base portion B
1
of a lower corner portion A
1
of the knapsack frame A. Within the coil spring B, throttle wire C for operating a throttle of the engine and an electric wire for stopping the engine are inserted. To the edge B
2
of the spring coil B is connected the edge of the throttle wire C, and a throttle lever is provided for operating it.
By providing such an operating means via a coil spring which can be freely bent, an operator can operate such a means at a position capable of being easily operated by picking it and bent to the desired position.
However, such a construction is disadvantageous in that the movable range is severely restricted not so as to set the position suitable for all of the operators. Also, even if the coil spring can be bent to a desired position, when the operator takes the hand from the coil spring such as at the time of finishing the operation, the coil spring is strongly returned to the original position (vertically), there being a risk to strongly hit the coil spring at the operator as shown on the broken line B′ in FIG.
4
. Moreover, when the operator wants to operate such an engine again, after the finishing of the operation, it becomes sometimes difficult to pick up the coil spring B′ again.
In order to overcome such an disadvantage, Japanese Patent Laid-Open No. 10-299503 discloses the use of a sporting tool made of a semi-rigid material which can be held in a prescribed portion instead of the coil spring. According to this patent application, a shape of the supporting tool of the operating portion can be changed according to the force applied and, the desired shape can be held even after the removal of the force.
However, such a kind of tool is often roughly treated not only during the operation but also in the case of storage and custody. Consequently, in the case of the tool made of the semi-rigid material, the tool becomes defective when it is bumped to deform or destroy the tool, and such a tool is disadvantageous in terms of durability.
Furthermore, in the case of the tool made of the semi-rigid material, there is also problem associated with immediate deterioration due to friction etc., when the operating portion is frequently moved.
Moreover, in the semi-rigid material there is a fear of the change in the rigidity due to the difference in the temperature. In addition, such a tool is often used under severe conditions such as heating generated by the use of the driving source. For these reasons, it is difficult to say that the tool exhibit constant function even under any conditions.
On the other hand, the use of the semi-rigid material requires an expensive cost in terms not only of the material cost but also of the processing cost in comparison with a generally used material such as iron.
SUMMARY OF THE INVENTION
Consequently, an object of the present invention is to provide an economic knapsack engine-driven tool excelling in workability, and durability.
The present invention concerns a knapsack engine-driven tool driven by an engine provided on a knapsack frame, which consists of a supporting tool composed of a hollow tube made of a flexible rigid material, whose base end is fixed onto the knapsack frame and in which the flexible rigid material can be held at a desired shape, a means for operating said engine provided on the edge portion of the hollow tube, a regulating wire which is inserted into the hollow tube for connecting said engine and said operating means, and a flexible protective member for covering said hollow tube.
The rigid material is preferably made of iron or brass.
Such a construction makes it possible to provide an economic knapsack engine-driven tool excelling in workability, and durability.
When an experiment on durability has been carried out actually in the case in which a hollow tube is a flexible rigid material, the result was as follows. In this experiment, flexible pipe was used as a hollow tube.
When a worker moved a means for operating provided on the edge portion of the flexible pipe from the edge portion of the flexible pipe, which is straight, to a desired portion, the flexible pipe was not bend at the center of the flexible pipe equally. Specifically, the flexible pipe was bent in close vicinity to the edge portion, Therefore, the number of that the flexible pipe is bent in close vicinity to the edge portion are increased and a problem comes up in terms of durability.
A metal material is engaged in the edge portion so that the flexible pipe is swaged. As a consequence, the flexible pipe is prevented from being bent in close vicinity to the edge portion.
The metal material is preferably made of iron in terms of strength
REFERENCES:
patent: 4552100 (1985-11-01), Kawaharazuka et al.
patent: 5813088 (1998-09-01), Wagner et al.
Liniak Berenato Longacre & White
Moore Chris K.
Shin-Daiwa Kogyo Co., Ltd.
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