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Motorized portable blower apparatus

a portable blower and motor technology, applied in the direction of propellers, propulsive elements, water-acting propulsive elements, etc., can solve the problem of intense competition

Inactive Publication Date: 2014-06-05
NOTARAS JOHN ARTHUR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a device that has a curved shape to direct airflow from a blower in the same direction as the handle, which reduces the amount of force on the operator. This design helps to make the device easier to use and more comfortable for the operator.

Problems solved by technology

Many manufacturers compete in this market and competition is intense both in terms of performance and price.

Method used

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  • Motorized portable blower apparatus
  • Motorized portable blower apparatus
  • Motorized portable blower apparatus

Examples

Experimental program
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first embodiment

[0051]Turning now to FIGS. 5-6B, the fan 7 is illustrated. The fan 7 consists of a generally flat disc 30 which is typically approximately 175-185 mm (approximately 7 inches) in diameter. This disc 30 has a central hub 31 which enables the fan to be mounted to the output shaft of the motor, and eight upright but rearwardly inclined blades 32 which extend generally radially but with a rearward sweep relative to the direction of motion of the fan 7 (counter-clockwise as seen in FIG. 5).

[0052]As illustrated in FIG. 6A, each of the blades 32 has a ramp portion 34 which forms the radially inner part of each blade, and a wing portion 35 which forms the radially outer portion of each blade 32.

[0053]As seen in the plan view in FIG. 7, each of the blades 32, because of its rearwardly swept nature, during rotation experiences a radially directed centrifugal force Fr which can be resolved into two components. These components are Fa, which is the component of the force directed along the longi...

second embodiment

[0057]Turning now to FIGS. 8-9B, it will be seen that the disc 130 of the second embodiment has a hub 131 and blades 132. The hub 131 includes a metal sleeve 133 which is molded into the disc 130 during its fabrication and provides a convenient mounting mechanism whereby the disc 130 can be mounted on the output shaft of the engine

[0058]Each of the upright blades 132 again has a ramp portion 134 and a wing portion 135, however, the blades 132 are straight (rather than being curved as in FIGS. 5-6B) and, as before, the blades 132 are rearwardly swept relative to a radius of the disc 132 and its direction of motion (anticlockwise). As before, the blades 132 are subjected to the rotational forces. However since in this embodiment the blades 132 are thicker and stiffer than the disc 130, it is the disc 130 which distorts to provide a more efficient air scoop than that provided by the undistorted prior art fans. This distortion of the disc 130 is illustrated in exaggerated fashion in FIG...

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PUM

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Abstract

A portable blower, and a fan for such a blower, are disclosed in which a plurality of blades extend from one side of a generally flat fan disc. The blades are swept rearwardly relative to the intended direction of rotation of the fan disc. The blades extend from the disc and are tilted transversely and in the direction of rotation of the disc. The tilt arises either due to manufacture or rotation of the disc and constitutes an air scoop for the fan.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to motorized portable blowers of the type used to blow leaves, grass clippings, etc. into a heap for subsequent disposal and, in particular, to hand held blowers. Such devices are used to maintain yards and gardens in a clean and tidy state, and include back pack style blowers as well as the more numerous hand held blowers.[0002]A typical prior art blower 101 is illustrated in FIG. 1 and essentially consists of a small motor in the form of an internal combustion engine 105 (either 2 stroke or 4 stroke) which has a fan mounted on its output shaft. Both the motor and the fan are contained within a housing 102 which has a handle 103 on top which enables the device to be carried. The device has a grille 106 with an array of small openings which covers a central air intake through which air enters to the fan. A single tube 111 constitutes the exit path for the air exiting the blower. Many manufacturers compete in this market ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A47L5/24F04D29/28
CPCF04D29/281F04D29/30F04D29/305
Inventor NOTARAS, JOHN ARTHURNOTARAS, ANGELO LAMBRINOS
Owner NOTARAS JOHN ARTHUR