Systems and devices for motion control
Systems and devices to control linear, rotational, and/or arcuate motion are provided herein. In some examples, a pin system is configured for insertion in a door and/or door jamb, and to control motion of the door, such as a speed with which the door closes. In some examples, a hinge pin is configured to replace a conventional hinge pin 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.
1. A device for controlling the motion of an object, comprising:
a body that includes a chamber filled at least in part with a shear thickening fluid,
a piston that is positioned in the body and that is connected to a cap, the piston configured to exert pressure against the shear thickening fluid in response to a force applied to the cap by the object, wherein the piston includes a plunger that is connected to a piston head,
a shim, wherein both the shim and the piston head include one or more slots, and
a rod connected to the piston, the rod configured to adjust an amount of pressure exerted against the shear thickening fluid and wherein the rod includes a first portion and a second portion that can slide with respect to each other, and the second portion includes a lip portion that is received in a hole in the shim, wherein the lip portion receives a plug that is connected to the plunger.
2. The device of claim 1 , further including a bushing to guide the cap and plunger into the chamber in response to the force applied to the cap.
3. The device of claim 2 , further including a spring that is configured to provide mechanical resistance between the cap and the bushing in response to the force applied to the cap.
4. The device of claim 1 , wherein the shear thickening fluid comprises a plurality of nanoparticles.
5. The device of claim 4 , wherein the plurality of nanoparticles comprises one or more of an oxide, calcium carbonate, synthetically occurring minerals, naturally occurring minerals, polymers, SiO 2 , polystyrene, polymethylmethacrylate, or a mixture thereof.
6. The device of claim 1 , wherein the shear thickening fluid comprises a polymeric material.
7. The device of claim 6 , wherein the shear thickening fluid comprises one or more of ethylene glycol, polyethylene glycol, ethanol, silicon oils, phenyltrimethicone, or a mixture thereof.
8. The device of claim 1 , wherein the one or more slots of the shim have a shape and size approximately equal to the one or more slots of the of the piston head.
9. The device of claim 1 , wherein the shim is configured to rotate with respect to the piston head thereby adjusting the amount of resistance experienced by the piston.
10. The device of claim 9 , 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.
11. The device of claim 10 , wherein the rod includes a first portion and a second portion that can slide with respect to each other, and the second portion is connected to the shim and when the rod is rotated, the shim is rotated with respect to the piston head.
12. The device of claim 11 , further including a knob that is located opposite the cap and that is connected to the first portion of the rod, wherein the knob can be rotated to rotate the rod.
13. The device of claim 12 , wherein the rod includes a generally D-shaped lip and the slot shim includes a generally D-shaped hole that receives the lip of the rod.
14. The device of claim 13 , wherein the piston includes a plug that is received in the lip of the rod.
15. The device of claim 3 , wherein the spring is located in a first portion of the chamber that is fluidly isolated from a second portion of the chamber in which the shear thickening fluid is located.
16. The device of claim 1 , wherein the lip portion is rotatable with respect to the plug and the plunger.
17. The device of claim 16 , wherein the piston head includes a counterbore with a protrusion, and the lip portion extends into the counterbore and the protrusion limits the rotational movement of the second portion.
18. The device of claim 1 , wherein the second portion slides along the first portion and toward the first portion when force is applied to the cap.
19. The device of claim 12 , wherein rotation of the knob causes the first portion of the rod to rotate and engage the second portion of the rod and cause the second portion of the rod to rotate, which causes the shim to rotate.
20. The device of claim 1 , wherein the shear thickening fluid 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 is greater than the first range of shear rates.
21. The device of claim 20 , wherein when the piston exerts pressure against the shear thickening fluid, the motion of the object 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.