Automatic retention apparatus
An apparatus for automatically adjusting tension on retention member to hold multiple objects together. Examples include using retention apparatus to obtain optimal fit and use of a human wearable item such as article of footwear. Sensors may be used to sense changes in movement of the article of footwear, of the person wearing it, or of a third object such as a vehicle carrying the person. A retention member may surround at least a portion of the objects, and an actuator may be included that automatically rotates a rotating member such as a gear or pulley that may be coupled to the retention member. The rotating member may be configured to automatically adjust tension on the retention member many times per second based on control signals from control logic responsive to the sensors.
1. An automatic retention apparatus, comprising:
a retention member defining one or more recesses in at least a portion of the retention member;
a rotating member with multiple teeth engaging the one or more recesses of the retention member, wherein the rotating member is rotatable in a first direction to reduce tension of the retention member, and wherein the rotating member is rotatable in a second direction opposite the first direction to increase tension of the retention member;
an electric motor coupled to the rotating member, wherein the electric motor is operable to rotate the rotating member to adjust the tension of the retention member;
a control circuit configured to:
determine a motor current draw for the electric motor,
determine a motion state of a target object the automatic retention apparatus at least partially surrounds using one or more sensors;
determine a target tension according to the motion state and the current draw using a processor of the control circuit; and
control the electric motor to increase or decrease the tension of the retention member to maintain the target tension.
2. The automatic retention apparatus of claim 1 , wherein the one or more sensors includes three axis accelerometer.
3. The automatic retention apparatus of claim 1 , wherein the one or more sensors includes a motion sensing device.
4. The automatic retention apparatus of claim 1 , wherein the one or more sensors includes a tension sensor mounted to the retention member that is configured to generate input based on tension of the retention member.
5. The automatic retention apparatus of claim 1 , wherein the one or more sensors includes a movement sensor configured to generate input to the control circuit based on movement of the target object.
6. The automatic retention apparatus of claim 1 , wherein the one or more sensors includes a movement sensor mounted to a receiving object that is separate and distinct from the target object, and wherein the receiving object is the target object acted on by the retention member.
7. The automatic retention apparatus of claim 1 , wherein the control circuit is configured to determine rotation in the first and second directions according to the target tension.
8. The automatic retention apparatus of claim 1 , wherein the control circuit includes a Proportional Integral Derivative (PID) configured to accept the target tension and the motor current draw as input and to control the electric motor to obtain the target tension.
9. The automatic retention apparatus of claim 1 , wherein determining a target tension includes:
reading the motion state and configuration data stored in a memory of the control circuit; and
comparing the tension of the retention member with the target tension.
10. The automatic retention apparatus of claim 1 , wherein the control circuit includes:
a current limiting circuit operable to reduce the current provided to the electric motor to avoid overloading the motor.
11. The automatic retention apparatus of claim 1 , wherein the retention member is an elongate retention member, and wherein the one or more recesses are defined in a portion of the retention member that is wider than it is thick, and narrower than it is long.
12. The automatic retention apparatus of claim 1 , wherein at least one of the one or more recesses include through holes interspersed along the retention member.
13. The automatic retention apparatus of claim 1 , wherein the rotating member rotates around an axis of rotation that is substantially parallel to a longitudinal axis defined by the retention member.
14. The automatic retention apparatus of claim 1 , wherein the rotating member rotates around an axis of rotation that is substantially perpendicular to a longitudinal axis defined by the retention member.
15. The automatic retention apparatus of claim 1 , wherein the rotating member includes a worm gear.
16. The automatic retention apparatus of claim 1 , wherein the retention member has two ends, and both ends are coupled to a mounting object, and wherein the target object is retained adjacent to the mounting object by the tension applied to the target object by the retention member.
17. The automatic retention apparatus of claim 1 , wherein the retention member surrounds at least a portion of the target object, and wherein at least one end of the retention member is coupled to the object the automatic retention apparatus is mounted to.
18. The automatic retention apparatus of claim 1 , wherein rotating the rotating member in a first direction displaces a first portion of the retention member relative to a second portion of the retention member to adjust the tension of the retention member.
19. The automatic retention apparatus of claim 1 , wherein the sensor input includes speed, angular momentum, velocity, motion, acceleration, air pressure, force, or ambient air temperature, or any combination thereof.