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Rollerskates Done Proper

Can also be powered
 
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Rollerskating requires a special technique to gain forward momentum. This is a bit rubbish. Far better to just walk as normal and for the skates to automatically brake the trailing skate or at least provide the little bit of friction that is normally provided by forcing the skate out sideways.

This idea allows the wearer to walk or run as normal and for the skates to automatically apply the friction needed to increase forward velocity* without just walking or running on the spot which is what happens if you try to run or walk in skates.

This also opens up a few opportunities to -

a) Walk like the martian dressed up as a woman in Mars Attacks

b) Make the skates powered and walk up to 30 mph.

* Braking is achieved by assuming anything akin to a normal slow walk is a braking activity. A fast walk indicates acceleration to continue. All that can be programmed on first use using the learning mode of the skates. The onboard AI also assists with keeping balance at high speeds although the skates assume some competence in the user being able to keep upright.

bigsleep, Nov 18 2017

Roller Skate with brake https://target.scen...&hei=1560&fmt=pjpeg
Just bend the toe down to drag the brake pad against the ground. [Vernon, Nov 20 2017]

Ratcheting Roller Skates https://www.google.com/patents/US4553767
[mylodon, Nov 21 2017]

[link]






       //Roller Skate with brake//   

       I've seen those [Vernon], but this is a different idea - that the wheels themselves provide a speed differential under computer control with the user keeping all 8 wheels on the ground at all times.   

       Here's another go at a description -   

       In a learning phase, imagine the computer gets the pattern of a normal walk e.g. the relative positions of the skates, velocities reached etc. Of course with the user on the rollerskates, he's going nowhere.   

       Now, if the user increases the speed of the walking motion to reflect a desire to accelerate, the motors on the skates add an increasing velocity to both skates while still maintaining a walking oscillation.   

       The unpowered version is similar but applies e.g. electro-magnetic braking to the wheels to give the user something to push against. Interestingly, this doesn't have to stop the wheel but just provide a temporary skate speed differential. I'm guessing even using passive wheel braking, you easily get 20mph our of a pair.
bigsleep, Nov 20 2017
  

       This should also work just as well for ice skates – brake the trailing wheel pair, except that it'd be the rear of the blade instead.
Ian Tindale, Nov 20 2017
  

       //it'd be the rear of the blade instead//   

       I'm beginning to think the passive braking technique isn't going to hold up very well except at low speeds. Yes. This idea only works if the skates are powered and simulate drag rather than decelerate any of the wheels. In fact the trailing pushing skate actually needs to accelerate to give something to push against.
bigsleep, Nov 20 2017
  

       Your back-step could compress springs to push against. You'd get decent speed from it but if you want power braking then I think you'll need to extend the front of the skate in relation to the deceleration to put all of the stress on that forward wheel and keep you from face-planting.   

       Hang on a second.   

       Thank you.   

       Now, surely this will only work to get you moving from a standstill? The point about pushing a (normal) skate sideways is that it provides forward push whilst, itself, also travelling forward. Your brake system won't do that - it will only allow you to push forward against a stationary rear skate.
MaxwellBuchanan, Nov 21 2017
  

       //Now, surely this will only work to get you moving from a standstill ?//   

       Yes. If you read some other annos I've already reached the point where I've abandoned any stationary wheels and got lost trying to figure out what relative speeds to power the skates at, so that a segway like control system can assist with acceleration, all without pushing a skate sideways or any wheels leaving the ground.   

       My previous anno is pretty close. If a steady speed was required, the skates would have to mirror a normal walking speed, even if the speed of travel was walking speed +15mph, say 20mph i.e. each skate would need to oscillate around the 20mph point to account for gait.   

       In that respect, any attempt to move a leg back faster *would* be encountering some resistance as the skate is on a profile to move it back slower i.e. 20mph +/- gait. If leg moves 21mpg +/- gait, the force will be exerted on the motor, which can be sensed by the motor as increased load and current drain so the control circuitry can merrily accelerate the skates a little.   

       But yes, friction as an element of control outside of starting at 0mph, is a non-starter, apart from when the skater is actually starting.
bigsleep, Nov 21 2017
  
      
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