Universal Fan Blade Mount

This invention relates to a fan blade mount which is characterized by a body portion having connection flanges at each end to connect the body portion to a fan blade and a ceiling fan rotor. The rotor connection flange includes an adjustment portion which allows the mount to be connected to rotors having differing fastener spacing.

Ceiling fans are very popular for facilitating air circulation in homes and businesses. As a result, various manufacturers construct and market ceiling fans to the public. Many of these manufacturers design their own models and subsequently, fan blades are constructed in a plurality of lengths, rotors are available in a variety of diameters, and the mounts are manufactured to join fan blades to specific rotors. Unfortunately, it is an all too common occurrence that the mount is damaged either through stresses caused by repeated start-ups of the rotor or by the fan blade coming in contact with another object and causing bending or breaking of the fan blade mount. In order to replace a broken fan blade mount, it was necessary to contact the manufacturer of the fan to order replacement parts. However, the manufacturer may no longer be in business or as is more often the case is not manufacturing that particular model and their new fan blade mounts are no longer compatible with the older model. Even if the new mounts are available, it may take several weeks to receive them.

In view of the above, it can be seen that there is a need for a universal fan blade mount which can attach a fan blade to any conventional rotor, regardless of the spacing of the attachment holes on the rotor.

OBJECTS AND SUMMARY OF THE INVENTION

The primary object of the disclosed invention is to provide a fan blade mount which can be attached to any conventional rotor regardless of the spacing between the rotor mounting holes.

Another object of the present invention is to provide a fan blade mount which is economical to manufacture.

Another object of the invention is to provide a fan blade mount which can be used as a replacement part on all varieties of ceiling fans.

In summary, therefore, this invention is directed to a fan blade mount for a ceiling fan. The mount includes a fan blade attaching flange at one end and a rotor attaching flange at its other end. The rotor attaching flange is formed into an arcuate shape and includes an arcuate slot for connecting the flange to the rotor.

These and other objects of the invention will be readily apparent in view of the following description and drawings of the above described invention .

The above and other objects and advantages and novel features of the present invention will become apparent from the following detailed description of the preferred embodiment of the invention illustrated in the accompanying drawings wherein:

FIG. 1 is a perspective view of a conventional ceiling fan;

FIG. 2 and FIG. 3 are fragmentary cross sectional views of fastener head recesses in the mount;

FIG. 4 is a perspective view of the ceiling fan mount;

FIG. 5 is a top plan fragmentary view of the ceiling fan mount attached at one end to a fan blade of indeterminant length and at the other end to a rotor.

Ceiling fan assembly A, as best shown in FIG. 1, includes several fan blades B having generally flat surfaces. Blades B are secured to assembly A by fan blade mounting members M. Mounting members M are generally constructed of metal such as brass, steel or aluminum which may be polished or painted to provide an attractive appearance. Other generally rigid materials such as plastics may also be used to construct the mounting members M. Mounting members M are attached to rotor R by fasteners 2 such as screws or bolts. Rotor R encircles and rotates around a fixed circular plate P as found on many conventional ceiling fans.

The mounting member M, as best shown in FIG. 4, includes plurality of fastener receiving holes 4 for securing the blade attaching flange 6 to fan blade B. Preferably, holes 4 are about 1/4" in diameter with a shoulder hole of about 7/16" in diameter. Blade attaching flange 6 is preferably formed in a decorative shape and extends across the entire end of blade B to permit fasteners 2 which extend into holes 4 to be widely spaced apart to secure blade B to mount M. Extending from the blade attaching flange 6 is a body portion 8 of a preferably generally rounded shape. It is to be understood that a flat shape could also be used for the body portion 8 as long as the body portion is of a length so that the blade B will be held extended from the rotor and preferably outside the perimeter of rotor housing 10. Rotor attaching flange 12 is formed at the other end of the elongated body portion 8. Flange 12 is formed in an arcuate flattened shape extending arcuately outwardly on either side of elongated body portion 8. Flange 12 includes a hole 14, preferably, of about 1/4" in diameter with a shoulder of about 7/16" in diameter for receiving a fastener on one side of elongated body portion 8 and includes an elongated arcuate slot 16, preferably, of about 1/4" in width and having a shoulder width of about 7/16" for receiving a fastener on the other side of elongated body portion 8.

It is the combination of the arcuate flange 12 and the arcuate slot 16 which provides the universal attachment feature of the preferred embodiment. Arcuate slot 16 allows adjustment of mount M such that mount M is adaptable to a variety of rotors. The arcuate shape of the flange 12 and slot 16 permits the mount M to extend radially from rotor R regardless of the spacing of fastener 2 in slot 16. It is of utmost importance that blade B extend radially from rotor R to ensure proper air flow and to maintain balance of the fan blades and ceiling fan assembly. The unique design of one adjustable slot and one non-adjustable hole in the connection between rotor R and fan blade mount M ensures correct alignment of blades B relative to each other. It is foreseeable that a double slot flange could be used instead of the one hole-one slot design, but that approach could create alignment problems between the fan blades and misalignment causes undesirable vibration which could lead to shortened life span of the rotor and blade mounts. It is further foreseeable that a non-arcuate slot could be substituted for slot 16. A straight slot could cause mount M to be angled relative to a radial line extending from the center of the rotor R.

As best shown in FIG. 5, front edge 18 of flange 12 forms an arc, and an extension of the arc is represented by curved dashed line X. The center line Y of hole 14 and slot 16 forms a circular arc which is concentric to dashed line X. Rear edge 20 of flange 12 also forms an arc, the extension of which is shown by curved dashed line Z. When mounts M are mounted on rotor R curved dashed lines X and Z are concentric with center line Y and rotor edges 22 and 24. Preferably, the curvature of center line Y is based on a rotor hole pattern diameter of 51/2".

FIG. 5 further shows the fan blade mount attached to a fan blade B by suitable fasteners 2 such as bolts or screws. Fan blade mount M is shown to be attached to a rotor R by similar fasteners 2. Blade attaching flange 4 and rotor attaching flange 12 may lie in the same plane or may lie in parallel planes spaced vertically. Preferably flange 4 and flange 12 lie in planes which are angled relative to each other so that fan blades B are angled slightly relative to their plane of travel so that an air flow may be created either up or down depending on the direction the blades B are turned by rotor R. The preferred angle of pitch 0 between flange 6 and flange 12 is about 12 .

In FIGS. 2 and 3, preferred embodiments of fasteners 2 are shown. In FIG. 2, mount M includes a recess for a threaded fastener 2 having a straight sided head. FIG. 3 shows a recess in the mount for a threaded fastener having an angled head. While the mounting holes 4 and 14, and slot 16 have been described as having preferred diameters and width, respectively, it is to be understood that modifications may be made to those and other features of the invention and are within the scope of the invention.

The mount M is primarily intended to be used as a replacement for damaged or broken original mounts and may be provided in combination with blades. Usually, a set of four mounts and four blades will be provided to ensure proper spacing between all the blades and to provide a matched appearance. The new mounts and blades are easily installed by simply removing the original broker mount by unscrewing the fasteners 2 and then simply installing the new mount and blade using the sam fasteners and inserting the fasteners in the same holes and tightening the fasteners to ensure that the replacement mounts M are securely fastened.

While this invention has been described as having a preferred embodiment, it is understood that it is capable of further modification, uses and/or adaptations of the invention which follow in general the principle of the invention and includes such departures from the present disclosure as come within known or customary practice in the art to which the invention pertains, and as may be applied to the central features herein before set forth, and fall within the scope of the invention or the limits of the appended claims.