Patent Application
20050121063
The present invention relates to a lighted umbrella, and more specifically to an umbrella having illumination structure powered by a solar power device.
Umbrellas have served many purposes for human. Some small umbrellas are light and easily carried by people and some large umbrellas are heavier and usually installed in the patio or near the beach. They can be used to shelter from the rain or sunlight. Lighted umbrellas have also been designed to provide illumination for the convenience of night activities or serving as outdoor decoration.
Lighted umbrellas powered by solar energy have become very popular in recent years because it does not require a power outlet or an extension cord to get the electrical power supply. In general, a solar power device having rechargeable batteries and solar cells are assembled on the top end of a shaft above the umbrella. Lighting devices mounted on the umbrella are powered by the solar power device. During the daytime, sun light provides the solar energy to charge the batteries for powering the lighting devices in the night.
There are a couple of shortcomings in the conventional lighted umbrella powered by solar energy. One is that the lighting devices usually take a lot of power which quickly drains out the charge in the batteries and hence the illumination only last a short period time. The other is that the lighting devices form very strong localized bright areas that are blinding to people.
The present invention has been made to overcome the above mentioned shortcomings of the conventional lighted umbrella. An object of the invention is to provide an illumination structure for the lighted umbrella that can provide uniform and pleasant light. Another object is to provide an illumination structure that can last for a long time with solar power.
According to this invention, the lighted umbrella powered by a solar power device comprises a frame with illumination structure. The frame includes a shaft, a plurality of ribs pivotally connected to the shaft, and a plurality of supporting bars each having one end pivotally connected to a movable connector received on the shaft and the other end pivotally connected to a rib. A solar power device is mounted on the top end of the shaft of the umbrella. Each rib has a hollow interior in which an electrical wire can be stored. A slot is formed on each rib to accommodate two transparent elongated light guiding rods that are disposed on the slot to form an opening space near the middle of the rib.
The hollow interior of each rib has an electrical wire that has one end connected to the solar power device and the other end connected with two light emitting diodes each being mounted on a respective transparent elongated rod through the opening space near the middle of the rib. Energy efficient devices such as light emitting diodes are used as the lighting devices to save energy provided by the solar power device. The transparent elongated rods guide the emitted light to increase the lighting area and form uniform and pleasant light.
The foregoing and other objects, features, aspects and advantages of the present invention will become better understood from a careful reading of a detailed description provided herein below with appropriate reference to the accompanying drawings.
With reference to
As shown in
A pin 206 is chained to the second connector 205. The shaft 201 has at least one through hole 207 formed thereon. When the umbrella is opened, the second connector 205 and the supporting bars 204 can be moved up or down to a desirable position. The pin 206 can be inserted into an appropriate through hole 207 so as to fix the second connector 205 and maintain the frame in an opened state. The umbrella can also be folded by removing the pin and moving down the second connector 205.
The solar power device 102 is mounted onto the top enter of the shaft 201 by a device such as a matched screw and a screw hole. A plurality of electrical wires 209 are connected to the solar power device 102 by an electrical connector 208 as shown in
With reference to a cut-off and decomposed view of a rib illustrated in
According to this invention, the preferred material for forming the rib 202 is an alloy such as aluminum. The rib 202 may have a rectangular cross section as shown in
The preferred material for forming the elongated rod 303 is acrylic-plastic. The elongated rod 303 also serves as a light guiding device for guiding the light emitted by the lighting device 305 along the rod to extend the lighting area. In this invention, the acrylic-plastic material is transparent, dispersive and diffusive to light so that uniform and pleasant light is created.
In the conventional lighted umbrella, either light bulbs or light emitting diodes have been used. Both are applicable to the lighting devices of this invention. However, light emitting diodes are preferred. The light guiding rod 303 of this invention has the advantage that the lighting area is greatly extended from the small light emitting diode by means of the transparent, dispersive and diffusive elongated rod. Therefore, two light emitting diodes are often adequate for the lighted umbrella. As a result, the rechargeable batteries which are contained in the solar power device can supply the power to the light emitting diodes for a longer period.
Although only two elongated rods and two light emitting diodes are illustrated in the preferred embodiment, more elongated rods and more light emitting diodes can be installed on each rib if desired. An opening space can be created where every two elongated rods meet for accommodating the lighting devices and the electrical wire.
Although only the preferred embodiments of this invention were shown and described in the above description, various modification or combination that comes within the spirit of this invention may also be made by a person skilled in the field according to the principle described.
