Footwear having removable motorized adjustment system

Abstract

An article of footwear may include a motorized tensioning system. The tensioning system may include a tensile member and a motorized tightening device configured to apply tension in the tensile member to adjust the size of an internal void defined by the article of footwear. The tensioning system may further include a power source configured to supply power to the motorized tightening device. The tensile member, the motorized tightening device, and the power source may be configured to be removably attached to the article of footwear.

What is claimed is: 
     
         1 . An article of footwear, comprising:
 a lace;   a motorized tensioning device configured to control tension of the lace;   at least one sensor, coupled to the lace, configured to receive information related to the tension of the lace;   a control unit, coupled to the sensor, configured to receive information from the at least one sensor, wherein the control unit is configured to:   continuously monitor the tension of the lace after a target tension has been achieved and adjusts the motorized tensioning device to maintain the target tension; and   cause the motorized tensioning device to increase the tension in the lace if the tension is less than the target tension and the motorized tensioning device decreases the tension in the lace if the tension is greater than the target tension.   
     
     
         2 . The article of footwear of  claim 1 , wherein the control unit is further configured to:
 operate the motorized tensioning device in a normal operating mode and an active operating mode;   wherein the control unit is configured to perform the power down operation after the target tension has been achieved in the normal operating mode;   wherein the control unit is further configured to continuously monitor the tension of the lace during the active operating mode.   
     
     
         3 . The article of footwear of  claim 2 , wherein the control unit is further configured to:
 power down the motorized tensioning device after a target tension has been achieved.   
     
     
         4 . The article of footwear of  claim 2 , wherein the active mode corresponds to a higher tension on the lace than the normal operating mode. 
     
     
         5 . The article of footwear of  claim 2 , wherein the active mode corresponds to a lower tension on the lace than the preset tightened state. 
     
     
         6 . The article of footwear of  claim 1 , further comprising:
 an upper portion including the lace to adjust fit of the upper portion against a foot; and   a lower portion including a mid-sole and an out-sole, the lower portion coupled to the upper portion at the mid-sole.   
     
     
         7 . The article of footwear of  claim 6 , further comprising a battery, operatively coupled to the control unit and the motorized tensioning device, positioned in the lower portion. 
     
     
         8 . The article of footwear of  claim 1 , wherein control unit is further configured to cause the motorized tensioning device to switch among a plurality of preset tensioning modes based on interaction with a user interface. 
     
     
         9 . The article of footwear of  claim 8 , wherein control unit is further configured to cause the motorized tensioning device to transition among a plurality of transitory states to incrementally increase or decrease an effective length of the lace. 
     
     
         10 . The article of footwear of  claim 9 , wherein a decrease of the effective length of the lace corresponds to a tightening of the lace and an increase of the effective length of the lace to a loosening of the lace. 
     
     
         11 . The article of footwear of  claim 9 , wherein a preset tightened state of the plurality of transitory states corresponds to a state including a shortest effective lace length and a preset loosened state of the plurality of transitory states corresponds to a state including a longest effective lace length. 
     
     
         12 . The article of footwear of  claim 8 , wherein the user interface is configured to increase the tension on the lace based on touching the user interface in a first location and decrease the tension on the lace based on touching the user interface in a second location. 
     
     
         13 . A control unit-implemented method of controlling a motorized tensioning device of an article of footwear, the article of footwear including a lace, the motorized tensioning device configured to control the tension of the lace, and at least one sensor, coupled to the lace, configured to receive information related to the tension of the lace, wherein the control unit is configured to perform operations comprising:
 continuously monitor the tension of the lace after a target tension has been achieved and adjusts the motorized tensioning device to maintain the target tension; and   cause the motorized tensioning device to increase the tension in the lace if the tension is less than the target tension and the motorized tensioning device decreases the tension in the lace if the tension is greater than the target tension.   
     
     
         14 . The method of  claim 13 , wherein the control unit is further configured to:
 operate the motorized tensioning device in a normal operating mode and an active operating mode;   perform the power down operation after the target tension has been achieved in the normal operating mode; and   wherein the control unit is further configured to continuously monitor the tension of the lace during the active operating mode.   
     
     
         15 . The method of  claim 14 , wherein the control unit is further configured to:
 power down the motorized tensioning device after a target tension has been achieved.   
     
     
         16 . The method of  claim 14 , wherein the active mode corresponds to a higher tension on the lace than the normal operating mode. 
     
     
         17 . The method of  claim 14 , wherein the active mode corresponds to a lower tension on the lace than the preset tightened state. 
     
     
         18 . The method of  claim 13 , wherein control unit is further configured to cause the motorized tensioning device to switch among a plurality of preset tensioning modes based on interaction with a user interface. 
     
     
         19 . The method of  claim 18 , wherein control unit is further configured to cause the motorized tensioning device to transition among a plurality of transitory states to incrementally increase or decrease an effective length of the lace. 
     
     
         20 . The method of  claim 19 , wherein a decrease of the effective length of the lace corresponds to a tightening of the lace and an increase of the effective length of the lace to a loosening of the lace. 
     
     
         21 . The method of  claim 19 , wherein a preset tightened state of the plurality of transitory states corresponds to a state including a shortest effective lace length and a preset loosened state of the plurality of transitory states corresponds to a state including a longest effective lace length. 
     
     
         22 . The method of  claim 18 , wherein the user interface is configured to increase the tension on the lace based on touching the user interface in a first location and decrease the tension on the lace based on touching the user interface in a second location.