Patent Application
20120212318
1. Field of the Invention
The invention pertains to apparatus and methods for securing devices onto vehicles, and more particularly to devices that can be securely locked onto trucks and cargo containers for tracking and other purposes.
2. Description of Related Art
The shipping industry is the life-blood of the global economy. Approximately 90 percent of all cargo moves through the Marine Transportation System (MTS). Domestic shipping via the MTS totals over $850 billion in cargo annually and contributes $2 trillion to the U.S. Gross Domestic Product. The current volume of domestic maritime shipping is expected to double over the next 20 years. International maritime shipping is expected to triple over the same time period. Yet, this system is plagued with problems of efficiency and security, which are different sides of the same coin. The solution to both problems of asset visibility and security can be solved with ruggedized intelligent locking systems as described in the applicant's co-pending applications. Due to the established processes and logistics needs of the industry, removable and reusable locking devices are required. However, these devices, sufficiently resilient and ruggedized, pose a threat to collateral life and property if incorrectly installed. In this situation, people installing and operating the device and vehicles traveling with proximity to the device are at risk if the device is inadvertently released from the container.
What is needed, therefore, is a convenient tracking and security module that may be easily installed and removed from a particular truck or cargo container, while at the same time being robust and self-aware, and able to correct for inadvertent misuse or incomplete installation.
3. Objects and Advantages
Objects of the present invention include the following: providing a manually actuated latch that is supplemented by an automatic lock for improved safety; providing a locking and tracking device having improved safety for attachment to cargo containers; providing a lock/latch mechanism that locks itself upon the detection of selected events; and, providing an instrumented module for moving vehicles that is less susceptible to accidental loss or damage. These and other objects and advantages of the invention will become apparent from consideration of the following specification, read in conjunction with the drawings.
According to one aspect of the invention, an instrument module for attachment to a shipping container, comprises:
a substantially rigid housing containing at least one electronic instrument;
a manually operated latch mechanism to attach the module to a first bar on the shipping container;
a means of detecting movement of the container; and,
an electromechanical lock mechanism to automatically secure the manually operated latch when a selected amount of movement is detected.
The drawings accompanying and forming part of this specification are included to depict certain aspects of the invention. A clearer conception of the invention, and of the components and operation of systems provided with the invention, will become more readily apparent by referring to the exemplary, and therefore non-limiting embodiments illustrated in the drawing figures, wherein like numerals (if they occur in more than one view) designate the same elements. The features in the drawings are not necessarily drawn to scale.
In Applicants' co-pending U.S. Patent Applications, various solutions are described for security and tracking of cargo, particularly in trucks and intermodal shipping containers. One element of these solutions involves an instrumented module that attaches to a shipping container and preferably spans the two locking bars, thereby preventing unauthorized access to the container between shipping and receiving points. The module is typically equipped with one or more geographic information systems to determine its location; these might include a global positioning system (GPS) as well as redundant systems such as clocks or dead reckoning methods to back up the primary location system. For the case of maritime shipping, Applicants contemplate that the module will normally be placed on the container at the point of shipping and can only be removed at the port of destination. For the case of trucking, Applicants contemplate that the module will be placed across the locking bars on a semitrailer and unlocked at various receiving or delivery points. It is therefore desirable that the module may be easily latched onto one of the locking bars of the trailer while the doors are open; then, when the doors are closed, the module engages the corresponding bar on the opposite door to secure the trailer until the next destination is reached.
The manual latch is intended strictly for keeping the module in a convenient position while the vehicle is at rest, and for quick attachment and detachment; it is not intended to be relied upon to keep the module in place when the truck is moving, particularly at highway speeds. When the module has engaged both locking bars and is activated, an electromechanical lock secures the latch mechanism with actuators common in mechanical engineering, such as screw drive, solenoid drive, etc. Applicants recognized that situations might arise in which the module has been manually latched onto one locking bar but not the other, and the driver inadvertently leaves the loading dock. In this case, to prevent the risk of the module accidentally coming loose from the bar, the present invention uses the module's inherent situational awareness to activate the lock automatically, thereby securing the latch and keeping the module attached even in the extreme case in which the door is unlocked and swinging freely.
In the examples that follow, it will become apparent that a trackable, removable, and secure device to secure both doors simultaneously provides a unique solution to many of the known concerns of the intermodal shipping industry. Some of the noteworthy benefits include: 1. Only one device is required to secure both the doors. 2. Tracking the lock is a convenient proxy for tracking the container. 3. The inventive device is reusuable by shipper or carrier and because it is a small, high-value component (compared to the empty container) it is more convenient to store when not in use than a similar component integrated permanently onto a container. 4. It does not interrupt the normal flow of cargo or impede legitimate access to the cargo. 5. It allows access to be granted according to a selected hierarchy of communications and information.
Applicants' co-pending application describes a removable module configured to securely lock a shipping container. Applicants contemplate that in many applications, the module will be configured with a form factor that is compatible with certain characteristic dimensions of standard shipping containers 10, as shown in
The module 12 typically contains, among other things, a GPS circuit that operates to prevent the container 10 from being unlocked before it has reached a selected destination. The module optionally includes the provision of at least the following: one or more selected sensor packages 21; one or more wireless communication systems that may include Radio Frequency Identification, data radios, cellular, and satellite communications. A suitable antenna is preferably disposed integrally with the device to minimize protrusions and protect the system from mechanical damage. Additional RFID components may be located on the side of the device.
Although some elements of the device (notably RFID tags) may be substantially passive devices, it is contemplated that in many applications it will be preferable to have an on-board power supply 25. This may be accomplished with batteries, fuel cells, and the like, and provision may also be made for recharging or maintaining charge via a cradle or an umbilical configured to accept power from a shipboard generator during ocean transit, for example.
The sensor package 21 may include a number of devices performing various security and tracking functions. The device may allow for wireless communication with a variety of sensors (chemical, biological, radiological, nuclear, explosive, temperature, humidity, vibration, accelerometry, etc.) and information sources (camera, keypad, PDA, cell phone, satellite phone, hand-held interrogator, RFID reader, etc.). The sensor package may contain a load cell, strain gage, or other means of monitoring tension on locking bar so that an alarm condition will be triggered if the bar is cut or even if the bars on the container door are cut. The device may communicate wirelessly with a sensor node, which detects a variety of constituents and conditions, either permanently or temporarily installed in an intermodal container, over the road trailer, or enclosed conveyance.
It will be appreciated that wireless communication may include such familiar protocols as serial radio, cellular radio, satellite radio, etc. The wireless device(s) will preferably be utilized in order of cost of communications beginning with the serial radio, which, with the Reader within range, represents the least cost. Failing to identify a valid serial radio link, the cellular radio may be activated. Failing to identify a valid cellular link, satellite communication to one of multiple low earth orbit satellite systems may be activated. This process optimizes the cost of data communications on a global basis.
31 Is the module latched?
32 OK
33 Is the module locked?
34 Is the module moving, based on speed or position?
36 Is impact or vibration detected?
35 Automatically actuate latch
The device can use a combination of well-known and commercially available components, systems, and/or services to determine location, speed, orientation, and direction of travel, as well as impact and vibration. GPS modules, such as the Fastrax 500 series, combine high sensitivity, multichannel receivers with Assisted GPS to provide precise location data at commercially viable price points. Cellular modems, such as the Telit 300 series, with quad-band GSM/GPRS transceivers, can provide the network data necessary for Assisted GPS, as well as Cell ID information that can be used by network providers, such as AT&T, or by some other Application Programming Interface (such as Google) to augment the position data in high interference areas. Solid state accelerometers, such as Analog Devices' ADXL345, can provide additional data points for speed and direction, as well as impact, vibration, and orientation.
With this wealth of position and status data, the on-board microprocessor 22 can be programmed to automatically secure the latch mechanism under a wide variety of conditions such as:
1. Speed over ground greater than a selected threshold value
2. Location indicates leaving a predefined area
3. Impact/vibration in a given axis greater than a selected threshold value
As noted earlier, the inventive module may contain various features to enhance aspects of situational awareness beyond simple geolocation via GPS or some other triangulation methods. The invention may therefore exploit information from these other sources, either as a supplement to geolocation or as a substitute therefor, as described in more detail in the following examples.
Applicants contemplate that in many cases, the inventive module will contain an onboard clock circuit. The module may therefore be programmed so that the electromechanical lock will automatically engage if a preset time has elapsed after manually latching it onto the first locking bar, if it has not been locked onto the second bar.
The inventive module may contain accelerometers, as part of a dead-reckoning system or to detect shock or impacts to the cargo. Information from these sensors may also be exploited to detect that the container is in motion and automatically activate the electromechanical lock.
The inventive module is contemplated to be a part of a communication network that allows users to view the location and status of assets during shipment, often in real time. The module is therefore equipped to communicate various aspects of its location and condition to a centrally located server system. The module may thus be programmed to report the fact that is has detected movement in an unlocked state and has autonomously activated its electromechanical lock. This information might be used to alert the system monitor that an off-normal situation exists and various actions should be taken. One such action, for example, would be to call the driver of the vehicle or his dispatcher, and alert them that the module has not been properly installed, that the vehicle appears to be moving without properly locked doors, and that immediate action is needed to stop and secure the locks correctly.
From the foregoing, it will be appreciated that the invention provides a greater degree of safety and security, by allowing the module to autonomously lock itself securely onto a moving container, after possibly improper installation, and to notify users that corrective actions are indicated.
This application is related to U.S. patent application Ser. No. 12/313,428 filed on Nov. 20, 2008, and U.S. patent application Ser. No. 12/313,427 filed on Nov. 20, 2008 by the present inventors, the entire disclosures of which are incorporated herein by reference.
