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 first hinge knuckle that includes 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, the chamber further retaining a plunger, wherein the plunger is connected to a screw;
a second hinge knuckle that includes a nut and a portion of the screw;
an upper hinge pin having a tapped hole to receive a cap screw connected to a cap; and
a piston assembly with an angled portion configured to channel shear thickening fluid into one or more slots of the piston assembly,
wherein when the first hinge knuckle is rotated, the screw rotates relative to the nut such that the piston assembly moves vertically causing the 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 rotation of the cap causes the cap screw to move vertically within a space between the upper hinge pin and the nut.
2 . The device of claim 1 , wherein the cap screw is aligned with a central axis of the screw, such that the cap screw is mated with a counter bore of the screw when a first hinge rotates away from a second hinge.
3 . The device of claim 2 , wherein an amount the cap screw extends into the space limits an amount of vertical movement of the screw within the space.
4 . The device of claim 1 , wherein the piston assembly further comprises a second portion configured to contact inner walls of the chamber.
5 . The device of claim 4 , further including a shim arranged within the angled portion, wherein the shim includes one or more slots.
6 . The device of claim 5 , 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.
7 . The device of claim 6 , wherein the shim is configured to rotate with respect to the piston thereby adjusting the amount of resistance experienced by the piston.
8 . The device of claim 7 , 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, 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 piston.
9 . The device of claim 1 , wherein the chamber is a first chamber, the device further comprising a bolt extending from a center of the piston assembly into a second chamber.
10 . The device of claim 9 , further comprising a shaft housing to receive the bolt as the piston assembly moves into the second chamber.
11 . The device of claim 10 , further comprising an end portion to provide access to the shaft housing and the bolt, wherein the bolt can be adjusted to control alignment of the one or more slots of the shim with respect to the one or more slots of the piston.
12 . A device for controlling the motion of a door, comprising:
a first hinge knuckle that includes 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, the chamber further retaining a plunger, wherein the plunger is connected to a screw;
a second hinge knuckle that includes a nut and a portion of the screw;
an upper hinge pin having a tapped hole to receive a cap screw; and
a piston assembly with an angled portion configured to channel shear thickening fluid into one or more slots of the piston assembly;
wherein when the first hinge knuckle is rotated, the screw rotates relative to the nut such that the piston assembly moves vertically causing the 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
a plunger bushing having one or more crevices arranged at an interface between the plunger bushing and the housing, the one or more crevices to accept an amount of shear thickening fluid.
13 . The device of claim 12 , further comprising a cap to support the cap screw, wherein rotation of the cap causes the cap screw to move vertically within a space between the upper hinge pin and the nut.
14 . The device of claim 13 , wherein the cap screw is aligned with a central axis of the screw, such that the cap screw is mated with a counter bore of the screw when a first hinge rotates away from a second hinge.
15 . The device of claim 13 , wherein an amount the cap screw extends into the space corresponds to an amount of vertical movement of the screw within the space.
16 . The device of claim 12 , further comprising a pin travels within one or more slots of the plunger bushing during vertical movement of the plunger rod.
17 . The device of claim 16 , wherein the plunger bushing is at least partially arranged within the second hinge and configured to substantially maintain a vertical position within the second hinge during rotation of the screw.
18 . The device of claim 12 , further comprising shaft housing comprising a portion extending into the chamber.
19 . The device of claim 18 , wherein the portion is defined by an outer wall designed to mate with an internal space of the shim, such that, when the first hinge rotates, the shim envelopes the outer wall of the portion.
20 . The device of claim 19 , wherein the portion further includes an internal space designed to receive an expanded portion of the bolt, such that, when the first hinge rotates causing the plunger to extend into the chamber and the bolt extends into chamber, the shim mates with the portion, and the expanded portion of the bolt mates with the internal space.