Fluid reaction surfaces (i.e. – impellers) – Specific drive or transmission means – Hand mixers
Reexamination Certificate
1999-03-12
2001-02-27
Look, Edward K. (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
Specific drive or transmission means
Hand mixers
C416S22000A, C464S184000, C415S053100
Reexamination Certificate
active
06193467
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a driven unit, and especially to a driven unit adapted to be used in a fan.
BACKGROUND OF THE INVENTION
The electric fan is a very important machine in our daily life. Computers, air conditioners, hair-blowers and the like all have electric fans inside. The blades of most electric fans are disc blades. When the disc blades are rotated, a columnar current vertical to the surface of blades will be generated. However, there are other kinds of electric fans, such as cross fan. The cross fan is substantially columnar and rotated along its axial direction of the column. When the cross fan is rotated, a planar surface of air current, a so-called air wall, will be generated. The cross fan is usually disposed on the top of the automatic door of a convenience store.
Conventionally, the blades are sleeved on a rotary shaft and a rubber cap is set at the end of the shaft to support the blades to be rotated together. However, because the surface of the rotary shaft is smooth, the rubber cap can easily slide from one place to another so that the rotation of the blades will be retarded and blocked by other elements.
To solve this problem, the rubber cap usually is agglutinated with the rotary shaft by an adhesive agent to ensure that the rubber is properly fixed on the rotary shaft, but this method is not good enough. The adhesive agent cannot be effectively attached on the smooth surface of the rotary shaft and after the shaft is rotated for a while, the heat generated by rotation will undo the adhesive agent, resulting in that the rubber cap cannot be fixed on the shaft. Consequently, the blades cannot rotate effectively and the cross fan will fail.
It is therefore attempted by the applicant to deal with the above situation encountered with the prior art.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a driven unit. The driven unit is adapted to be used in a cross fan and driven by a prime mover. The driven unit includes a rotary shaft, a rotary member, and a fixing medium. The rotary shaft is coaxially mounted to the prime mover and rotated along an axial direction by the prime mover. There is a concave region on a peripheral surface of the rotary shaft for securing the fixing medium thereon. After the rotary member is sleeved on the rotary shaft, the fixing medium is mounted on the rotary shaft subsequently for preventing the rotary member from shifting. Therefore, the rotary member can be rotated properly along the axial direction by the rotary shaft. Because the fixing medium is secured in the concave region on the surface of the rotary shaft, the rotary member can be effectively rotated.
According to the present invention, the prime mover is a motor and the concave region can be a concave ring around the shaft, a plurality of screw threads, or notches. The fixing medium is an elastic cap, especially a rubber cap, so that the cap can be embedded in the concave region of the rotary shaft to prevent the rotary member from shifting on the rotary shaft.
The present invention may best be understood through the following description with reference to the accompanying drawings, in which:
REFERENCES:
patent: 3241742 (1966-03-01), Laing
patent: 3694881 (1972-10-01), Glucksman
patent: 3885127 (1975-05-01), Walter et al.
patent: 0356314 (1990-02-01), None
Delta Electronics , Inc.
Look Edward K.
MacPherson Alan H.
McDowell Liam
Skjerven Morrill & MacPherson LLP
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