US PATENT SUBCLASS 188 / 266
INTERNAL-RESISTANCE MOTION RETARDER

Current as of: June, 1999
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188 /   HD   BRAKES

266INTERNAL-RESISTANCE MOTION RETARDER {29}
267  DF  .~> Using magnetic flux
267.1  DF  .~> Electroviscous or electrorheological fluid
267.2  DF  .~> Magnetic fluid or material (e.g., powder)
266.1  DF  .~> Motion damped from condition (e.g., bump, speed change) detected outside of retarder {1}
266.7  DF  .~> Piezoelectric
266.8  DF  .~> With failure or malfunction detection
268  DF  .~> Using yieldable or fluent solid or semisolid
269  DF  .~> Using diverse fluids
270  DF  .~> Operating against ambient atmosphere
271  DF  .~> Combined with surface-friction brake
272  DF  .~> Combined with mechanism retarded by brake {1}
274  DF  .~> With heat exchanger
275  DF  .~> With fluid regulated in response to inertia of valve member
276  DF  .~> With means compensating for change in temperature or viscosity {1}
280  DF  .~> Relative speed of thrust member or fluid flow
281  DF  .~> Resistance alters relative to direction of thrust member (e.g., high resistance in one direction, low in the other) {1}
283  DF  .~> Piston having a restrictable opening (e.g., apertured plate) in a fixed volume chamber {1}
284  DF  .~> Position of thrust member relative to chamber {4}
290  DF  .~> Using a rotary-type fluid damper {4}
297  DF  .~> Having a thrust member with a variable volume chamber (e.g., coaxial or telescoping tubes, compensating reservoir) {7}
322.13  DF  .~> Valve structure or location {2}
322.16  DF  .~> Including seal or guide {2}
322.19  DF  .~> Cylinder structure {2}
322.22  DF  .~> Thrust member or piston structure
322.12  DF  .~> Including protective shield for retarder
321.11  DF  .~> Including means connecting thrust member to load
299.1  DF  .~> Controlled by an operator (e.g., vehicle driver) remote from retarder
300  DF  .~> With means for locking parts together temporarily
322.5  DD  .~> Using viscosity of fluid medium

DEFINITION

Classification: 188/266

INTERNAL RESISTANCE MOTION RETARDER:

(under the class definition) Device including a first member attached to a moving mechanism, wherein there is relative motion between the first member and either a medium or a second member, and wherein at least one component of the relative motion is restrained or dissipated by a reluctance to be disturbed that exists within the medium or the second member.

(1) Note. The term "reluctance to be disturbed" is used to describe the internal resistance of a medium to movement of an object therethrough, such as (a) a liquid (which has viscosity), (b) a magnetic field (which has flux lines of force), (c) a gas (which has density, though less than that of liquid), and (d) granular material (which is fluent under certain conditions). Said term also describes the internal resistance of an object (i.e., the "second member" of the definition) to elastic deformation, such as a spring or body of rubber (which yieldingly resists deformation). The named mediums and objects are only examples of those that can be found within devices in this and indented subclasses. In each of these devices, internal resistance is the characteristic that retards motion.

(2) Note. The movement of the first member is not restricted to motion in only one direction, but may include return motion in the opposite direction. However, when the movement of the member is returned, both the energy of the original motion and that of the returned motion are absorbed by the retarder. In neither direction of motion is absorbed energy returned by the device to cause return movement.

SEE OR SEARCH CLASS

182, Fire Escape, Ladder, or Scaffold,

233, for fluid resistance brakes for fire escapes, ladders and scaffolds.

192, Clutches and Power-Stop Control, 215+, for internal resistance brake with a transmission control.

267, Spring Devices, appropriate subclasses for a device by which energy absorbed during movement of a member in one direction is returned to restore the member to its original position.

293, Vehicle Fenders,

134, for bumpers having fluid shock absorber means to absorb an impact force on the bumper.