one embodiment of a storage unit 100 having regulated access to contents housed within the unit , such as portable electronic devices , is shown generally in fig1 and 2 . the storage unit 100 is particularly well suited for use in clinical settings where a group of authorized clinicians may share use of various portable electronic devices . as one example , the portable electronic devices may include laptop computers , pdas , tablet pc &# 39 ; s , cellular phones , and the like , which may display various types of clinical information ( e . g ., electronic medical records ( emr ) or other documentation , diagnostic images , etc .) and facilitate communication with other portable electronic devices , computing devices or networks . the storage unit 100 provides a centralized location where a number of shared devices may be stored while ensuring that only authorized clinicians may access the devices . additionally , the storage unit 100 is configured to provide an organized layout where specific devices can be easily located and differentiated from other devices within the unit 100 . the storage unit 100 is formed generally by an enclosure 102 with a ceiling 104 , a floor 106 , a pair of sidewalls 108 , a back wall 110 and a pair of front access doors 112 . locking mechanisms 114 regulate the opening of the access doors 112 for obtaining access to the enclosure 102 . an exterior shelf 116 extends from each sidewall 108 , and set of casters 118 are mounted onto the floor 106 of the enclosure 102 for portability of the storage unit 100 in a clinical environment ( e . g ., hospital , physician &# 39 ; s office , etc .). it should be understood that the overall shape of the enclosure 102 shown in fig1 and 2 is exemplary . additionally , the enclosure 102 may one , two , or any number of access doors 112 mounted onto the enclosure 102 as a matter of design choice . in the embodiment illustrated in fig2 , the pair of access doors 112 are pivoted to a fully opened position to reveal a plurality of shelves 120 onto which may be placed portable electronic devices 122 of a particular size . the shelves 120 are preferably mounted upon drawer slides 124 ( e . g ., roller or ball bearing ) as seen in further detail in fig3 . the drawer slides 124 are fixedly positioned within the enclosure 102 to allow for extension of the shelves 120 laterally outward . this facilitates removal of electronic devices 122 from specific shelves 120 without disturbing electronic devices 122 on other shelves 120 . the shelves 120 may have uniform vertical spacing between one another of a limited dimension in order to limit the sizes of specific portable electronic device 122 that may be stored on certain shelves 120 within the storage unit 100 . for instance , the shelf spacing may limit the storage of items larger than a full - size laptop computer on most shelves 120 . furthermore , specifically dimensioned bays 126 may be formed on particular shelves 120 to provide a storage region for small electronic devices 122 ( e . g ., pdas ) while preventing larger electronic devices 122 from being placed on such shelves 120 . those of skill in the art will appreciate , however , that other shelf sizes and configurations may be selected based on the types of portable electronic device 122 desired to be stored within the unit 100 . a pair of divider walls 128 extend vertically through the enclosure 102 between first and second columns of shelves 120 . the divider walls 128 define a central chamber 130 therebetween into which a power supply 132 ( i . e ., a ac - to - dc power converter ) for each of the portable electronic devices 122 may be stored . a multi - outlet power strip 134 is mounted onto the back wall 110 of the enclosure 102 and may be plugged into a standard wall a / c outlet of a building . each power supply 132 plugs into the power strip 134 to provide power ( converted to d / c ) to a specific electronic device 122 . the divider walls 128 also have cutouts ( not shown ) to allow power supply cords 136 to extend therethrough to reach the electronic devices 122 stored on the shelves 120 . a plurality of horizontally flanges 138 extend from the divider walls 128 within the central chamber 130 and are each generally positioned adjacent to one of the shelves 120 to support a power supply 132 that is associated with one particular electronic device 122 that is to be placed on the adjacent shelf 120 . for instance , each shelf could be designated with a particular position ( e . g ., column 1 , shelf 5 ) and a particular electronic device 122 associated with that position by placing a label on the exterior of the electronic device 122 denoting the assigned position for the device 122 . this ensures that when the electronic device 122 is placed on a shelf , the power supply 132 associated with that particular electronic device 122 is conveniently located in an adjacent position and may be easily plugged in to recharge the battery within the electronic device 122 . as seen in further detail in fig4 , a resilient clip 140 is attached to the upper surface 142 of each shelf 120 and serves to retain an end connector 144 of the power supply cord 136 on the shelf 120 through extension and retraction of the shelves 120 . this allows a clinician to easily plug the end connector 144 into a electronic device 122 without having to search for the end connector 144 within the enclosure 102 . adjacent to the clip 140 on each shelf 120 is a pressure sensor 146 , which may be in the form of a thin membrane . exemplary pressure sensors 146 that are suitable include piezoelectric pressure sensors or pressure transducers . the pressure sensor 146 detects the presence of an electronic device 122 on the shelf 120 by the weight of the electronic device 122 pressing on the pressure sensor 146 . when a pressure change is detected , either by a electronic device 122 being placed on or removed from the pressure sensor 146 surface , a signal is transmitted to circuitry 500 disposed within a housing 148 mounted to the enclosure 102 , and seen in further detail in fig5 . circuitry 500 processes the signal received from the pressure sensor 146 to determine if an increase or decrease of pressure has occurred from the last signal received from the particular pressure sensor 146 transmitting the signal . additionally , circuitry 500 registers the time at which the signal is received from the particular pressure sensor 146 , which allows for logging of the amount of time a particular electronic device 122 has been “ checked out ” of the storage unit 100 . as an alternative to the pressure sensor , an optical sensor ( e . g ., an infrared sensor ) or other type of sensor may be provided for sensing the presence of an electronic device 122 upon a particular shelf 120 . the functionality of circuitry 500 will be explained in further detail herein . returning to fig1 and 2 , and with reference to fig5 , one locking mechanism 114 is mounted onto each of the access doors 112 . each locking mechanism 114 has an actuator 150 , for example , a solenoid , operating on electrical current regulated by the circuitry 500 . the actuator 150 turns a hub 152 having a pair of opposed locking rods 154 pivotably mounted thereto . when one of the access doors 112 is in the closed position shown in fig1 , the rotation of the hub 152 extends the locking rods 154 through apertures 156 in top and bottom sections 158 and 160 of each access door 112 and into the slots 162 and 164 in the ceiling 104 and floor 106 , respectively , of the enclosure 102 to lock the door 112 in place . clinicians may be provided by a clinical organization with an access card ( not shown ) having a readable magnetic strip that stores information regarding authorization for access to the electronic devices 122 within the storage unit 100 . such an access card would thus function in a similar way to known cards having a readable magnetic strip , such as a consumer credit or debit card . accordingly , the storage unit 100 has an electronic card reader 166 mounted on the external surface 160 of one of the doors 112 . the electronic card reader 166 scans the magnetic strip present on an access card to verify whether the clinician associated with the card is authorized to access the devices 122 within the storage unit 100 . upon scanning , the card reader 166 sends a signal to the circuitry 500 to verify whether the access card should grant storage unit access . if so , then the circuitry 500 allows a flow of electrical current to energize the actuator 150 and cause hub 152 rotation and retraction of the locking rods 154 from the slots 162 and 164 , thereby allowing the doors 112 to be fully opened to the position depicted in fig2 . in an alternative embodiment , the card reader 166 may be replaced with a touch keypad ( not shown ) or other device allowing a clinician to enter certain information ( e . g ., a confidential alphanumerical passcode ) confirming authorization to access electronic devices 122 within the storage unit 100 . it should be understood that other types of locking mechanisms 114 may be implemented with the storage unit 100 . for example , mechanisms may be mounted directly onto the enclosure 102 instead of on the access doors 112 . such a locking mechanism may extend locking rods 154 or the like through either or both of the apertures 156 in the top and bottom sections 158 and 160 of each access door 112 to maintain the doors 112 in the closed position . with reference to fig2 and 7 , an magnetic contact switch 168 may be provided , in one embodiment , with each access door 112 . each contact switch 168 includes a wired magnetic component 170 mounted to the underside 176 of the ceiling 104 of the enclosure 102 and an unwired magnetic component 172 mounted onto an inside surface 174 of one of the access doors 112 . when one access door 112 is moved to the closed position , the wired magnetic component 170 and unwired magnetic component 172 are in close proximity to one another to form a completed circuit , as seen in fig7 . circuitry 500 detects the completed circuit and controls the electrical current flow to the actuator 150 of the associated access door 112 to enable locking of the door 112 . thus , when one of the access doors 112 is moved to the closed position , it is automatically locked without requiring further action from the clinician accessing the storage unit 100 . in accordance with one embodiment , the circuitry 500 includes a processing unit 502 , such as a microprocessor , microcontroller or application - specific integrated circuit , along with associated memory 504 . by way of example , the processing unit 502 handles control signals and / or data signals of various types . for instance , one or more pressure sensors 146 generate a signal that is transmitted to the processing unit 502 . the memory 504 stores embedded software that is used by the processing unit 502 to determine pressure values based on the signal received from a specific pressure sensor 146 and also causes the processing unit 502 to note the time when the signal was received and the specific sensor 146 from which the signal originated . the embedded software is also used in the verification of authorization information ( e . g ., retrieved from the scanned access card ) for accessing the storage unit 100 . circuitry 500 optionally includes a digital - to - analog ( d / a ) converter 506 connected with a speaker 508 . when the locking mechanisms 114 move to the unlocked position , so that either or both of the access doors 112 may be opened , the circuitry 500 notes the time . if the circuitry 500 does not detect a completed circuit or “ closed access door ” condition from each of the magnetic contact switches 168 within predetermined period of time ( e . g ., 60 seconds ), the circuitry 500 generates an alarm signal that is transmitted to the d / a converter 506 , which forces the speaker 508 to produce an audible alarm to remind the clinician to close all of the access doors 112 to the storage unit 100 . circuitry 500 may also include a transmitter 510 for communication with a clinical network via a remote receiver ( not shown ), so that information logged and stored by the circuitry 500 regarding storage unit 100 access , an alarm situation , or electronic device 122 inventory , return to and / or retrieval from the unit 100 may be monitored by a clinical organization . furthermore , the exemplary architecture of the circuitry 500 ensures that if the main power input to the storage unit 100 is not provided , then access to the enclosure 102 is forbidden . more specifically , if the storage unit 100 is simply unplugged , the electronic card reader 166 will not be able to scan access cards , and no electrical current will flow to the actuators 150 , both steps being necessary to unlock the access doors 112 . one exemplary process 600 for regulating access to the electronic devices 122 within the storage unit 100 is illustrated in fig6 . a clinician will swipe an assigned access card through the electronic card reader 166 , in step 602 . based on information detected on the card , a decision is made in step 604 regarding whether an authorized request for access has been made . if the request for access is not authorized , then the access doors 112 of the storage unit 100 remained locked in step 606 and thereafter the process 600 ends . otherwise , in step 608 , an authorized request for access causes the locking mechanisms 114 to unlock each of the access doors 112 . each pressure sensors 146 then detects the presence of electronic devices 122 and transmits representative signals to the circuitry 500 , in step 610 , allowing the circuitry 500 to register the positions ( i . e ., particular column and shelves 120 ) where electronic devices 112 are presently located while also logging the time of the access doors 112 unlocking . thereafter , the pressure sensors 146 detect the removal from and return of electronic devices 122 to the shelves 120 while one or more of the access doors 112 are opened , as will be explained herein . in step 612 , a determination is made as to whether electronic device 122 removal is detected by any particular pressure sensors 146 . if none of the pressure sensors detect the removal of electronic devices 122 , the process continues at step 616 . otherwise , if electronic device removal is detected , then in step 614 , the circuitry 500 registers the position and time of removal for each electronic device 122 removed . then , in step 616 , a determination is made as to whether electronic device 122 return is detected by any particular pressure sensors 146 . if none of the pressure sensors detect the return of electronic devices 122 , the process continues at step 620 . otherwise , if electronic device return is detected , then in step 618 , the circuitry 500 registers the position and time of return for each electronic device 122 returned . during the process 600 , the circuitry 500 is detecting for a closed circuit condition with each magnetic contact switch 168 , which signals that the access doors 112 are closed and the contents of the enclosure 102 are secure . based on the time noted for when the locking mechanisms 114 unlock the access doors 112 ( in step 608 ), the circuitry 500 determines , in step 620 , whether a excessive period of time has elapsed since the access doors 112 were unlocked based on a predetermined time limit . if the predetermined time limit is exceeded before the circuitry detects the closed circuit condition for the magnetic contact switches 168 , an alarm signal is generated by the circuitry 500 and an audible alert provided by the speaker 508 in step 622 . otherwise , detection of the closed circuit condition for each of the magnetic contact switches 168 before the predetermined time limit is exceeded causes the process to move directly to step 624 . returning to step 622 , the audible alarm will cease once the closed circuit condition for each of the magnetic contact switches 168 is detected . at the point where the circuitry 500 detects the closed circuit condition for each switch 168 , then in step 624 , the closing of the doors is registered . circuitry 500 then controls the electrical current flow to the actuator 150 of each locking mechanism 114 to enable locking of the access doors 112 , in step 626 . thereafter , the process 600 ends . as can be seen , the storage unit 100 and associated methods of operation thereof provide for controlled and shared access to portable electronic devices in a clinical environment . since certain changes may be made in the above invention without departing from the scope hereof , it is intended that all matter contained in the above description or shown in the accompanying drawing be interpreted as illustrative and not in a limiting sense . it is also to be understood that the following claims are to cover certain generic and specific features described herein .
a storage unit and associated methods of use enable clinicians to store portable electronic devices in a centralized location while ensuring that proper authorization is needed to access the devices . the storage unit is formed with an enclosure for housing portable electronic devices . a plurality of shelves are disposed within the enclosure , each being sized for supporting a portable electronic device . one or more access doors are mounted onto the enclosure and moved between a closed position preventing access to housed electronic devices and an open position where the electronic devices may be viewed and accessed . each access door has a locking mechanism coupled therewith to selectively maintain the access door in the closed position . optionally , the locking mechanism receives input regarding a request for access to the enclosure and automatically unlocks the associated access door when the input received is associated with an authorized request for access .