Systems and devices for motion control
Systems and devices to control rotational and/or arcuate motion are provided herein. In some examples, a hinge system is configured to replace a conventional door hinge and to control motion of the door. In some examples, a hinge system is configured to replace a conventional door hinge and to control motion of the door by employing a shear thickening fluid. In some examples, a door closure system is configured to replace a conventional door hinge and to control motion of the door by employing two opposing springs.
1 . A device for controlling the motion of a door, comprising:
a housing that includes a nut and a chamber filled at least in part with a shear thickening fluid that is configured to have a decreasing viscosity in response to a first range of shear rates and an increasing viscosity in response to a second range of shear rates, wherein the second range of shear rates are greater than the first range of shear rates;
a screw at least partially within the nut, the screw connected to a pin;
a first hinge leaf to receive the pin such that the pin and the screw are configured to rotate with the first hinge leaf; and
a second hinge leaf in a fixed position relative to the housing,
wherein when the first hinge leaf is rotated, the screw rotates relative to the housing and the nut such that the nut moves vertically, forcing a piston assembly to exert pressure against the shear thickening fluid such that motion of the door transitions from a first velocity to a second velocity when the shear thickening fluid correspondingly responds to transitioning from the first range of shear rates to the second range of shear rates, wherein the second velocity is less than the first velocity.
2 . The device of claim 1 , wherein the piston assembly comprises a first angled portion configured to channel shear thickening fluid into one or more slots of-a piston head, and a second portion configured to contact inner walls of the chamber.
3 . The device of claim 2 , further including a shim arranged within the angled portion, wherein the shim includes one or more slots.
4 . The device of claim 3 , wherein the one or more slots of the shim have a shape and size approximately equal to the one or more slots of the piston head.
5 . The device of claim 4 , wherein the shim is configured to rotate with respect to the piston head thereby adjusting the amount of resistance experienced by the piston head.
6 . The device of claim 5 , wherein rotation of the shim to a first position substantially aligns the one or more slots of the shim with the one or more slots of the of the piston head, and rotation of the rebound shim to a second position substantially misaligns the one or more slots of the shim with the one or more slots of the of the piston head.
7 . The device of claim 6 , further comprising an end cap to provide access to a bolt extending from the piston assembly, the shim connected to the bolt such that rotation of the bolt causes rotation of the shim.
8 . The device of claim 7 , further comprising an end bushing to maintain a fluid seal between the chamber and the end cap.
9 . The device of claim 2 , further comprising:
a bushing connected to the piston assembly; and
a cam in contact with the nut and the bushing, wherein movement of the nut causes the cam to force the piston assembly to exert pressure against the shear thickening fluid.
10 . A device for controlling the motion of a door, comprising:
a housing that includes a nut and a chamber filled at least in part with a shear thickening fluid that is configured to have a decreasing viscosity in response to a first range of shear rates and an increasing viscosity in response to a second range of shear rates, wherein the second range of shear rates are greater than the first range of shear rates;
a screw at least partially within the nut, the screw connected to a pin;
a first hinge leaf to receive the pin such that the pin and the screw are configured to rotate with the first hinge leaf; and
a second hinge leaf in a fixed position relative to the housing,
wherein when the first hinge leaf is rotated, the screw rotates relative to the housing and the nut such that the nut moves vertically, forcing a piston assembly to exert pressure against the shear thickening fluid such that motion of the door transitions from a first velocity to a second velocity when the shear thickening fluid correspondingly responds to transitioning from the first range of shear rates to the second range of shear rates, wherein the second velocity is less than the first velocity, and
wherein the housing is supported by the pin and configured to extend from the second hinge leaf opposite the first hinge leaf.
11 . The device of claim 10 , further comprising an end cap configured to turn and cause a bolt extending from the piston assembly to rotate, wherein the shim is connected to the bolt such that rotation of the bolt causes rotation of the shim.
12 . The device of claim 11 , further comprising an end bushing to maintain a fluid seal between the chamber and the end cap.
13 . The device of claim 10 , wherein the piston assembly comprises a first angled portion configured to channel shear thickening fluid into one or more slots of a piston head, and a second portion configured to contact inner walls of the chamber.
14 . The device of claim 13 , further including a shim arranged within the angled portion, wherein the shim includes one or more slots.
15 . The device of claim 14 , wherein the one or more slots of the shim have a shape and size approximately equal to the one or more slots of the piston head.
16 . The device of claim 15 , wherein the shim is configured to rotate with respect to the piston head thereby adjusting the amount of resistance experienced by the piston head.
17 . The device of claim 16 , wherein rotation of the shim to a first position substantially aligns the one or more slots of the shim with the one or more slots of the of the piston head, and rotation of the rebound shim to a second position substantially misaligns the one or more slots of the shim with the one or more slots of the of the piston head.
18 . A device for controlling the motion of a door, comprising:
a housing that includes:
a nut configured to move vertically within the housing;
a cam connected to the nut and configured to move vertically within the housing in response to movement from the nut; and
a chamber filled at least in part with a shear thickening fluid that is configured to have a decreasing viscosity in response to a first range of shear rates and an increasing viscosity in response to a second range of shear rates, wherein the second range of shear rates are greater than the first range of shear rates;
a pin having a screw at one end, the screw at least partially within the nut;
a first hinge leaf to receive the pin such that the pin and the screw are configured to rotate with the first hinge leaf; and
a second hinge leaf in a fixed position relative to the housing,
wherein when the first hinge leaf is rotated, the pin and screw rotate relative to the housing and the nut such that the nut moves vertically within the chamber, forcing the cam to move a piston assembly to exert pressure against the shear thickening fluid such that motion of the door transitions from a first velocity to a second velocity when the shear thickening fluid correspondingly responds to transitioning from the first range of shear rates to the second range of shear rates, wherein the second velocity is less than the first velocity.
19 . The device of claim 15 , wherein the housing is supported by the pin and configured to extend from the second hinge leaf opposite the first hinge leaf.
20 . The device of claim 10 , wherein the piston assembly comprises a piston with one or more slots, and a shim having one or more slots, wherein the shim is configured to rotate with respect to the piston thereby adjusting the amount of resistance experienced by the piston assembly against the shear thickening fluid.
21 . The device of claim 1 , wherein the housing is a single, continuous cylinder.