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Venturi fanRelated Patent Categories: Pumps, Motor Driven, Electric Or Magnetic Motor, Rotary Motor And Rotary Nonexpansible Chamber Pump, Having Means To Mount Pump And Motor In Working PositionVenturi fan description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060110272, Venturi fan. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED PATENTS [0001] The present application claims priority to U.S. Provisional Application Ser. No. 60/630,113, filed Nov. 22, 2004, incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] The present invention relates to fans generally, and to fans used in industrial and commercial settings in particular. [0003] The purpose of a fan is move air in order to ventilate and cool an area. In industrial and commercial environments, where air conditioning may be impractical, fans are vital to employees' health and comfort. [0004] There are several types of fans used in commercial and industrial environments. One type includes a fan blade enclosed within a wire frame housing or "cage", sometimes mounted on a pedestal. The shaft of a motor outside the housing may project into the housing to turn the blades. These fans work fine in smaller quarters. Increasing the speed of the motor and the pitch of the blade allows this type of fan to throw more air, but increases noise. Another type of fan is a venturi fan that has a metal, venturi-shaped housing with a motor and a set of blades mounted therein. The set of blades is rotated by the motor and thus accelerates air through the housing. These fans move a large volume of air and project it over large distances, which fact is especially important in large industrial buildings such as distribution centers, but they are relatively noisy. [0005] Thus there remains a need for improvements in fans, particularly high volume industrial and commercial fans such as venturi fans. SUMMARY OF THE INVENTION [0006] According to its major aspects and briefly recited, the present invention is a venturi fan capable of producing a significant, directed flow of air but with significantly reduced noise compared to prior art venturi fans. The present fan has a body comprised of a generally cylindrical wire basket for carrying a motor and fan blade assembly, and a flared intake carried at the rear of the wire basket. Preferably, the front of the basket carries an exit channel, which may also have a flare but is otherwise preferably substantially cylindrical in shape. The rear-flared intake allows for a smooth feed of air into the basket and past the motor and the air-accelerating fan blade assembly. The wire basket, in a preferred embodiment, acts as a conduit for the flow-path air but also admits additional air into the flow path and channels the flow of air produced by the fan while allowing fan noise to dissipate through the sides. The basket also avoids generation of some fan noise and is a safety feature, preventing injury in its role as both the side and rear finger guard. [0007] An important feature of the present invention is the relatively open sides of the present fan, compared to prior art venturi fans. The relatively open sides contribute significantly and in a number of ways to noise reduction, chiefly by allowing noise to escape, while not significantly degrading the flow of air. Indeed, the openness of the sides increases the amount of air available to the fan. [0008] Additionally, the combination of the rear flare intake and the wire basket is a significant feature of the present invention. This combination allows the flow of air generated by the fan blade assembly to be created and directed significant distances with little diffusion. [0009] The use of the wire basket to support the motor and fan blade assembly is yet another important feature of the present invention. This arrangement reduces material, weight and obstructions to air flow while providing a sufficiently sturdy securement for the motor and fan blade assembly. [0010] These and other features and their advantages will be apparent to those skilled in the art of fan design from a careful reading of the Detailed Description of Preferred Embodiments accompanied by the following drawings. BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS [0011] In the drawings, [0012] FIG. 1 is a perspective view of a fan, according to a preferred embodiment of the present invention; [0013] FIG. 2 is a side view of the fan of FIG. 1, according to a preferred embodiment of the present invention; [0014] FIG. 3 is a front view of the fan of FIG. 1; [0015] FIG. 4 is a rear view of the Fan of FIG. 1; [0016] FIG. 5 is a perspective view of the Fan of FIG. 1 with the front finger guard and fan blade assembly removed to show the mounting of the motor; and [0017] FIG. 6 is a detailed view of the interior of the fan of FIG. 2 showing the manner in which the motor is mounted, according to a preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION [0018] The present invention is an improvement in venturi-style fans. Venturi fans direct a significant quantity of air in a forward direction and are suitable for large buildings such as warehouses. Unfortunately, prior art venturi fans are relatively noisy. [0019] FIG. 1 illustrates in perspective the present venturi fan 10. Fan 10 has a housing 12 that is flared on both the front 14 and the rear 16, and has a front finger guard 18. Inside housing 12 is a motor 22 and a fan blade assembly 24. Continue reading about Venturi fan... Full patent description for Venturi fan Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Venturi fan patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. 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