Patent Application
20090179760
The present invention pertains generally to electronic devices used on vehicles such as shopping carts. More particularly, the present invention pertains to a system that detects when a vehicle is in use. The present invention is particularly, but not exclusively, useful as a system that provides on-demand operation of electronic devices in response to movement of a vehicle.
In many retail shopping areas, shopping carts that include electronic devices are provided to the public. For instance, electronic identifiers may be mounted on carts in order to: 1) provide for shopping cart inventory control and maintenance; 2) prevent shopping cart theft; and 3) monitor customer shopping habits. In addition to the above-mentioned applications, electronic devices that provide coupons, directions or shopping assistance may also be mounted on shopping carts.
Due to their use on mobile carts, electronic devices, whether RF transceivers, magnetic sensors or other instruments, must operate on battery power. Unfortunately, batteries that provide sufficient power and life for use on shopping carts are expensive. Also, such batteries often present maintenance problems in the field. Further, the required battery replacement or recharging process may make the use of batteries on carts labor prohibitive. This is particularly true for RF transceivers that consume significant power on a frequent basis to detect local RF signals.
In view of the problems associated with batteries used on mobile shopping carts, the present invention contemplates selectively powering cart-mounted electronic devices. Specifically, because a cart-mounted electronic device is generally only in use when the cart is in motion, the device may be switched to a sleep state when the cart is not in use. In this manner, the power used by a cart is greatly reduced. As a result, the battery replacement or recharging frequency is also greatly reduced.
In light of the above, it is an object of the present invention to provide a system for providing an on-demand operation of a mobile electronic device. Another object of the present invention is to provide a system that selectively switches a mobile electronic device between an operating state and a resting state. Yet another object of the present invention is to provide a system for operating cart-mounted electronic devices that can be easily incorporated for use with the electronic devices and related systems. Another object of the present invention is to provide an electronic device operating system that is easy to use, simple to manufacture, and comparatively cost effective.
In accordance with the present invention, a system provides an on-demand operation of a mobile electronic device is mounted on a shopping cart. The purpose of the system is to reduce the power used by the device. Specifically, the system virtually eliminates the power used by the device when the shopping cart is not in use. Preferably, the electronic device and the system are mounted to a caster on the vehicle.
For the present invention, the system includes a detector for sensing movement of the device. For instance, the detector may be an accelerometer, a shock sensor, a moving magnet or a light sensor. Further, the system includes a controller electronically connected to the detector and to the device. With this interconnection, the controller is able to switch the device between an operating state and a resting state. For example, the controller switches the device to the operating state upon initiation of movement of the device, as sensed by the detector. Also, the system is provided with a timer that is connected to the controller. As designed, the timer causes the controller to switch the device to the resting state after the expiration of an uninterrupted pre-determined time interval of non-movement of the electronic device, such as less than five minutes.
As envisioned for the present invention, the electronic device includes a battery. Further, the battery is connected to the controller to provide power for the device during the operating state. Depending on the intended use, the electronic device may be an RF transceiver, a magnetic sensor, or another device used on shopping carts.
During operation of the system, a cart may initially be at a standing position with the electronic device in the resting state, which is a very low power sleep state. When the cart is moved, the detector senses movement of the electronic device and communicates the movement to the controller. In response, the controller wakes the electronic device from the resting state and switches the electronic device to the operating state, i.e., a full power state. Thereafter, the detector continues to monitor movement of the electronic device. Whenever the device becomes still, the timer measures the time until the device is moved again. If the time exceeds a pre-determined time interval, then the controller switches the electronic device back to the resting state.
In certain cases, turning the electronic device on-and-off frequently could interrupt various electronic device functions. In other cases, frequently switching the electronic device between states would be viable. Therefore, it is envisioned that the timer and/or controller may be manipulated to adjust the length of the predetermined time interval.
The novel features of this invention, as well as the invention itself, both as to its structure and its operation, will be best understood from the accompanying drawings, taken in conjunction with the accompanying description, in which similar reference characters refer to similar parts, and in which:
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To begin operation of the system 10, the cart 14 may be considered to be initially at rest. Thereafter, when the cart 14 is moved, the caster 16 necessarily moves. At that time, the detector 18 of the system 10 senses the movement of the caster 16 and the device 12 and communicates a “dynamic” signal to the controller 22. When the controller 22 receives the signal from the detector 18, it switches the electronic device 12 to the operating state in which the device 12 uses its full power requirement from the battery 26. Thereafter, the detector 18 continues to monitor the dynamic/static state of the cart 14 and device 12. When the device 12 becomes still, the detector 18 sends a “static” signal to the controller 22. In response, the controller 22 operates the timer 24 to measure the length of time that the device 12 remains static. When the time exceeds a predetermined time interval, the controller 22 switches the electronic device 12 to the resting state in which the device 12 uses a greatly reduced amount of power from the battery 26. Then, the detector 18 again monitors the device 12 for movement.
If the device 12 remains static for a period of time less than the predetermined time interval, then the controller does not switch the device 12. Instead, the device 12 remains in the operating state and the detector 18 monitors the device 12 to determine if the device 12 has become still again.
While the particular Caster System Activator as herein shown and disclosed in detail is fully capable of obtaining the objects and providing the advantages herein before stated, it is to be understood that it is merely illustrative of the presently preferred embodiments of the invention and that no limitations are intended to the details of construction or design herein shown other than as described in the appended claims.
