Patent Grant
7399102
The disclosures made herein relate generally to portable electric lighting devices and, more particularly, to portable lighting devices which operate without the need for batteries or an external electrical supply by converting potential energy of a flowing granular mass into kinetic energy to operate a generator.
The use of portable lighting devices is well known in the prior art. Many examples are known which use one or more batteries to power a variety of light producing devices including incandescent bulbs and fluorescent lamps. Certain varieties of such known portable lighting devices are equipped with rechargeable batteries eliminating the need to purchase replacement batteries after one discharge.
A limitation of battery operated portable lighting devices is that the batteries provide a limited supply of stored energy and therefore operate a light for a limited amount of time before draining beyond use. In such cases new batteries must be available to return the portable lighting device to service.
A limitation of battery operated portable lighting devices utilizing rechargeable batteries and lacking an internal power source is that the rechargeable batteries store a limited amount of electrical energy providing illumination for a limited amount of time before requiring recharge. While the rechargeable batteries may be recharged multiple times, an external power source must be available to supply power to restore the charge.
Additionally, it is known to have portable electric lighting devices operated without batteries or an external electric power supply by the use of a hand crank, squeeze trigger or similar means operating a small electric generator to produce enough current to operate the lamp of the device.
A limitation of such self powered electric lighting devices is that the hand crank or similar means must be continually operated in order to keep the portable lighting device illuminated. This procedure is inconvenient for many tasks where both hands must be free and available to work.
Therefore, a portable self contained light generating device which eliminates the need for batteries as well as external power to operate the light, a self contained light generating device which utilizes high efficiency solid state light emitting diodes, a self contained light generating device which is configured to produce electricity to operate the light emitting diodes by converting a portion of the kinetic energy granular material flowing under the influence of gravity, such a portable self contained light generating device would be useful and novel.
Accordingly, embodiments of the inventive disclosures made herein comprise various embodiments of a portable self contained light generating device powered by a flow of a falling granular material which impinges upon and thereby causes a paddle wheel to rotate, turning a small generator producing electricity to power one or more light emitting diodes.
Embodiments of the device include upper and lower chambers connected by a neck, the chambers and neck in at least some embodiments having the appearance of an hour glass. Embodiments of the device include a support means having two opposing substantially flat base members which are held in a spaced parallel relationship by one or more support rods which span between the bases and are secured to the bases near the base edges. The device includes first and second chambers which alternately dispense then later receive granular material after the device is turned by 180 degrees. The first and second chambers are connected by a neck having a passage through which a small flow of granular material may fall under the influence of gravity from one chamber to the other. The first and second chambers are contained between the bases of the support means. A paddle wheel is rotatably mounted in the neck to intercept granular material flowing through the neck between the first and second chambers. A generator is connected to the shaft of the paddle wheel such that rotation of the paddle wheel causes the shaft of the generator to rotate thereby causing the generator to produce an electric potential. The device has one or more light emitting diodes secured to the support means. The light emitting diodes are provided on one or more sides of the support means. A multi-position power switch for controlling the operation of the LEDs for controlling the amount of illumination is secured to the support means. The power switch is interposed in the electrical circuits between the generator and the light emitting diodes.
In at least one embodiment the self contained light generating device powered by a flow of falling granular material further includes a battery secured within the base of the support means of the device. The rechargeable battery is electrically connected to the generator such that the generator, when operating, charges the battery. The rechargeable battery is available to provide electrical energy to operate the light emitting diodes on the device after the granular material has transitioned from the top chamber to the bottom and is no longer available to operate the paddle wheel, or when additional electrical energy is required to supplement the energy supplied by the generator. In some of these embodiments, the battery is a rechargeable battery.
In at least one embodiment of the self contained light generating device powered by a flow of falling granular material the multi-position switch has four positions, specifically an ‘off’ position as well as ‘low’, ‘medium’ and ‘high’ illumination settings. The lower settings consuming less power and providing for longer operating times, specifically when operating from the battery. In various embodiments, LEDs may be dimmed using one of two methods. The first method involves a reduction of the current flow through the LED. Many common LEDs are rated for a maximum current of 20 mA, but may be provided with less current (say through the use of a larger current limiting resistor in series with the LED or LEDs) where reducing the current effects a proportional reduction in illumination. Illumination may also be reduced by turning off a number of the LEDs, in this way reducing illumination and power consumption. Either method is suitable for use on embodiments provided in this disclosure. In certain embodiments, a portion of the LEDs may also comprise high flux LEDs having a higher light output. Such LEDs also draw a higher current and require more power than standard LEDs. In these embodiments the high flux LEDs may be deactivated by the multi-position switch when the switch is moved from the high to the medium or low illumination setting.
In some embodiments the self contained light generating device powered by a flow of falling granular material is provided with LEDs on the vertical support rods alone. In other embodiments the self contained light generating device powered by a flow of falling granular material is provided with LEDs on the support rods as well as on the bases of the support means. In certain embodiments LEDs are provided on one side of the support means, while in other embodiments LEDs are provided on two sides or in other embodiments on all four sides of the support means.
In some embodiments of the self contained light generating device powered by a flow of falling granular material, the granular material is a variety of common dry sand such as used in conventional hour glass timers. In other embodiments the granular material is a dense metallic granular material such as lead, steel, brass, or iron. The granules may be in various granular shapes such as round pellets or square pellet shapes, and in a variety of granule or pellet sizes where the granule or pellet size and material density is chosen to have sufficient mass so that when falling as a stream or flow the granules or pellets provide sufficient impact force on the paddle wheel to result in sufficient torque to cause the paddle wheel to rotate and operate the small generator under its working load, where the working load consists of the activated LEDs and possibly the rechargeable battery. In certain embodiments the multi-position switch restricts the rechargeable battery to recharge from the generator when the LEDs are turned off so as to maximize the amount of electrical power available to operate the LEDs.
In some embodiments of the self contained light generating device powered by a flow of falling granular material, the chambers are transparent such that the level of the granular material in the chambers is easily observed, such as a clear plastic or glass. In other embodiments the chambers are made of an opaque material such as a variety of plastic or metals.
It is an objective of the inventive disclosure made herein to provide a self contained light generating device that eliminates the need for batteries as well as external power to operate the light.
It is another objective of the inventive disclosure made herein to provide a self contained light generating device that utilizes high efficiency solid state light emitting diodes to produce the high amount of illumination from a limited electrical supply.
It is another objective of the inventive disclosure made herein to provide a self contained light generating device that is configured to produce electricity to operate the light emitting diodes by converting a portion of the kinetic energy of a flow of granular material streaming between the upper to lower chambers under the influence of gravity.
It is another objective of the inventive disclosure made herein to provide a self contained light generating device that further includes a battery to supplement the electrical power supplied by the generator or to provide power to operate the LED lights when the generator is not operating.
These and other objects of the invention made herein will become readily apparent upon further review of the following specification and associated drawings.
The drawings show a form of the invention that is presently preferred, however, the invention is not limited to the precise arrangement shown in the drawings.
In preparation for explaining the details of the present inventive disclosure, it is to be understood by the reader that the invention is not limited to the presented details of the construction, materials and embodiments as illustrated in the accompanying drawings, as the invention concepts are clearly capable of other embodiments and of being practiced and realized in various ways by applying the disclosure presented herein.
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The discussed construction, illustrations and sequence of operation is for one embodiment of the invention, but is in no way limiting to other embodiments. The operating modes may be changed and enhanced without deviating from the intention of this inventive disclosure.
In the preceding detailed description, reference has been made to the accompanying drawings that form a part hereof, and in which are shown by way of illustration specific embodiments in which the invention may be practiced. These embodiments and certain variants thereof have been described in sufficient detail to enable those skilled in the art to practice the invention. It is to be understood that other suitable embodiments may be utilized and that logical, material, and mechanical changes may be made without departing from the spirit or scope of the invention. To avoid unnecessary detail, the description omits certain information known to those skilled in the art. The preceding detailed description is, therefore, not intended to be limited to the specific forms set forth herein, but on the contrary, it is intended to cover such alternatives, modifications, and equivalents, as can be reasonably included within the spirit and scope of the appended claims.
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| Number | Date | Country | |
|---|---|---|---|
| 20080123330 A1 | May 2008 | US |
