Fluid reaction surfaces (i.e. – impellers) – Specific working member mount – Distally supported on radial arm
Reexamination Certificate
2000-11-13
2002-02-19
Lopez, F. Daniel (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
Specific working member mount
Distally supported on radial arm
C416S221000
Reexamination Certificate
active
06347924
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a combination between the blade bracket and the motor casing for ceiling fans.
BACKGROUND OF THE INVENTION
A conventional combination between blade brackets and a motor casing for ceiling fans known to applicant is shown in FIG.
6
and generally includes an engaging plate
52
on a lower end of the motor casing
51
, and threaded holes
521
are defined in the engaging plate
52
. Each blade bracket
531
is connected to a blade
54
by a shank
53
, and two holes
532
are defined through the bracket
531
so that the bracket
531
is fixed to the plate
52
by bolts
533
extending through the holes
532
and engaged with the threaded holes
521
. The connection between the brackets
531
and the plate
52
by bolts
533
could be loosened and that will cause dangerous results. Another engagement is disclosed in U.S. Pat. No. 6,048,173 to Tsai, the assignee with the title of “engagement of blade brackets and the motor casing for a ceiling fan”. As shown in
FIG. 7
, the U.S. Pat. No. 6,048,173 disclosed a bracket
631
with two inclined side and the engaging plate
62
has tapered-shaped recesses
621
so that the brackets
631
is securely engaged with the recesses
621
by centrifugal force. However, this engagement requires a precise machining work to make sure that the brackets
631
is snugly engaged with the recesses
621
, or the coating on the brackets
631
and the inside of the recesses
621
could be peeled off and get rust therein.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a combination of blade brackets and motor casing for ceiling fans. An engaging ring is connected to the motor casing and a plurality of slots are defined in an underside of the engaging ring. Each slot is located between two sidewalls extending from the underside of the engaging ring and a first notch is defined in an inside of the close end defining each slot so as to receive a U-shaped spring therein. A boss extends from an inner top surface defining each slot and a recess is defined in the inner top surface defining each slot and opens to the inner periphery of the engaging ring so that a positioning space is defined between a section of the boss and the an inner top surface defining the recess. Each blade bracket has a block extending therefrom and each block includes an elongate head and an elongate neck which is engaged between the two legs of the spring. The elongate head is received in the positioning space in each slot. A lengthwise distance of each elongate neck is longer than a distance between the two legs of each spring so that the two legs of the spring are widened by the elongated neck. An end plate extends from each blade bracket and is located in opposite to a blade connected to the blade bracket. Each end plate has two inclined sides so that when rotating the bracket to let the two legs of the spring widened, the two inclined sides are pushed by the two sidewalls.
The primary object of the present invention is to provide a combination between the blade bracket and the motor casing wherein a spring is received in each slot and clamps a boss of each blade bracket.
These and further objects, features and advantages of the present invention will become more obvious from the following description when taken in connection with the accompanying drawings.
REFERENCES:
patent: 6139276 (2000-10-01), Blateri et al.
Bacon & Thomas PLLC
Lopez F. Daniel
McAleenan James M.
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