The invention relates to a ceiling fan consisting of a rotatable
assembly to which the fan blades are attached and a stationary assembly in or capable
of being placed in connection with a suspension means, said assembly having a common
centerline, and the rotary assembly comprising the rotor and the stationary assembly
the stator, located coaxially inside the rotor, of an electric motor, while the
rotatable assembly is mounted rotatably relative to the stationary assembly by
means of a tubular member extending coaxially with the said centerline and a shaft
located therewithin, two bearings located at a distance one above the other being
installed between said shaft and the tubular member, at least one of which bearings
comprises a rolling bearing. Such a ceiling fan is known from British patent application
In the known ceiling fan, the shaft is mounted in the tubular member
by means of two rolling bearings, said tubular member being integral with a bottom
or end dish belonging to the rotatable assembly, to which the fan blades are attached,
and the shaft being connected at the top thereof to the suspension means.
Assembling the known ceiling fan from its several parts is a comparatively
difficult operation, requiring skilled workers, in particular to install the shaft
in the tubular member by means of the two bearings in such manner that they run
perfectly coaxial, and to attach the fan blades in the proper locations on the
dish, as otherwise there will be an imbalance in the fan, with severe wear and
a high noise level when the ceiling fan is in operation, as the consequences.
The object of the invention is to provide a ceiling fan of the type
mentioned that can be assembled in very simple manner and by less skilled labor.
This object is accomplished in that, in the ceiling fan according
to the invention, the other one of the two bearings comprises a journal bearing.
Preferably, the tubular member is part of the stationary assembly,
and the rotatable assembly is fixed to the shaft, so that the tubular member and
the shaft mounted therewithin by means of the said bearings constitute a preassembled
whole, the tubular member being provided at one of its ends with means for attaching
said member to the suspension means, and the shaft protruding at the other end
of the tubular member, this projecting portion of the shaft being provided with
means for attachment of the rotary assembly to the shaft.
The tubular member-shaft assembly may then be produced in large numbers
in a specialized shop and delivered as such to an assembly shop where the several
parts of ceiling fans may be assembled together in simple manner.
Preferably, the stator is placed around the tubular member with a
tight fit, so that the stator may be mounted in simple manner as well.
Advantageously, the projecting end of the shaft is provided with a
disc-shaped part accommodated in a round recess inside the otherwise known end
dish, said end dish being attached to the disc-shaped part by means of at least
one fastener, in particular a bolt, whereby the nedessary accurate coaxial fixation
of the rotatable assembly may likewise be achieved in a simple manner.
At the same time, the end dish may be provided with a plurality of
shoulders formed on the inside thereof for attachment of the rotor.
In a ceiling fan whereof the rotatable assembly comprises a bottom
or end dish provided with a cylindrical erect peripheral flange, in an embodiment
according to the invention, the peripheral flange passes over, at least at the locations
of the fan blades, into the bottom part of the dish by way of an indentation directed
inward, thus forming a projecting bottom end on the peripheral flange, while above
said indentation, in the top end of the peripheral flange, an opening is provided
to be engaged by the hook-shaped end of an upper, generally L-shaped angle, co-
operating with a lower, substantially identical angle the hook-shaped end of which
catches behind the projecting bottom end of the peripheral flange, these two angles
being held against each other by means of a bolt or similar element with the horizontal
legs of the angle in contact with each other, and holding a fan blade fixed between
them at their other extremities.
By virtue of the opening previously provided in the peripheral flange
of the end dish, the locations for the fan blades are accurately determined, so
that the correct installation of the fan blades is likewise a comparatively simple
The invention will be further illustrated with reference to the two
embodiments of a ceiling fan according to the invention that are shown in the sectional
views of the drawing.
As shown in Fig. 1 of the drawing, the ceiling fan comprises a rotatable
assembly consisting of an end dish 1 having an erect peripheral flange 1′
and accommodating the rotor 2. The erect flange 1′ is locally provided with
indentations 3, so that the erect flange 1′ has a downward projecting bottom
end 1″ at these points. Above each indentation 3, the top end of the erect
flange 1′ is provided with an opening in which the hook-shaped end 4′
of an L-shaped angle 4 engages, which angle 4 cooperates with a bottom L-shaped
angle 5 of which the hook-shaped end 5′ catches behind the projecting bottom
end 1″ of the peripheral flange 1′. The angles 4 and 5 are clamped
against each other by means of a bolt 7, while a fan blade 6 is clamped between
the other extremities 4″ and 5″ of the angles respectively.
Inside the end dish 1, the projecting annular rim 3′ forms
a recess accommodating a disc 8, the end dish 1 being attached to said disc 8 by
means of screws 9.
The disc 8 is integral with a shaft 10 mounted by means of the ball
bearing 11 and the journal bearing 12 in a tubular member 13 so that the shaft
10 can rotate in the tubular member 13. Around the tubular member 13, a stator
14 is tightly fitted. The top of the tubular member 13 is provided with an internal
screw thread into which a contact assembly 15 is screwed, a setscrew 16 being provided.
The contact assembly 15 is connected at the top to a suspension rod 17.
Around the contact assembly 15, a protective hood 18 is arranged,
while a top dish 19 is slipped over the tubular member 13.
In the embodiment of a ceiling fan according to the invention as
shown in Fig. 2 of the drawing, there is likewise an end dish 21 having an erect
peripheral flange 21′. In this case, however, said end dish 21 is provided
with a plurality of shoulders 22 formed on the inside, to which, by means of screws
23, the rotor 24 is fixed. Besides, in this embodiment, the fan blades 25 are fixed
directly to the head flange of the end dish 21 by means of screws 26, these being
screwed into threaded holes 26′ made in the head flange beforehand in the
Otherwise, the embodiment shown in Fig. 2 is like that of Fig. 1.
Thus, by means of the projecting annular flange 21″, a cavity is again formed
inside the end dish 21, in which, by means of screws 27, a disc 28 is fixed, which
disc 28 is integral with a shaft 29 rotatably mounted in a tubular member 32 by
means of a ball bearing 30 and a journal bearing 31. Around the tubular member
32, a stator 33 is again tightly fitted, while the top of the tubular member 32
is provided with an internal thread in which a compact assembly as shown in Fig.
1, or a suspension rod 34 directly, may be screwed. Also, there is again a top
dish 35 slipped around the tubular member 32.
The shafts 10, 29 shown in Figs. 1 and 2 may alternatively be hollow
shafts, so that a control means in the form of a cord for example may be passed
through such a shaft.
In assembling the ceiling fans shown, the starting point is the assembly
consisting of the tubular member 13, 32 and the shaft 10, 29 installed therein.
First the stator 14, 33 is slipped over the tubular member 13, 32. Then the rotor
assembly consisting of rotor 2, 24 and end dish 1, 21 is fixed to disc 8, 20,
whereafter the top dish 19, 35 is mounted with a press fit around the tubular member
13, 32. Next, the contact assembly 15 is connected to the tubular member 13, the
electrical connections are made using the cords 20, and the protective fluid 18
put in place. Lastly, the fan blades 6, 25 are attached to the rotatable assembly
1 by means of angles 4 and 5, and/or screws 26.