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An engineering challenge - speeder related
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PL1:
Thanks.

Here's another version with the LA mounted to the right throttle collar.

The orange are springs so that the LA can go in or out and it puts tension on one spring or the other without forcing the pin to move.  This prevents damage if someone is pressing the throttles in opposite directions so that the pin binds.

The black dots are holes through the shaft. Use mechanics wire and the correct size washer to make a spring stop like on my mouse shooter.  (Parts list here.)




Scott
Le Chuck:

--- Quote from: PL1 on September 06, 2012, 08:54:16 pm ---
The orange are springs so that the LA can go in or out and it puts tension on one spring or the other without forcing the pin to move. 

--- End quote ---

I understand your english words but don't get what the springs are doing.  The LA will go in or out without those springs, how do they aid the mechanism? 

I'm liking your design because I've switched to round axle (cost benefit analysis... something about spending $100 just on sleeves when a welded washer with a set screw will do the same thing on the handle connection).  This outs my previous idea of a sliding collar so I'm pretty much committed to some small factor LA.  Running a pin through some flanged bushings that are welded onto the rod ends will work pretty well I think. 
PL1:

--- Quote from: Le Chuck on September 06, 2012, 10:52:39 pm ---
--- Quote from: PL1 on September 06, 2012, 08:54:16 pm ---
The orange are springs so that the LA can go in or out and it puts tension on one spring or the other without forcing the pin to move. 

--- End quote ---

I understand your english words but don't get what the springs are doing.  The LA will go in or out without those springs, how do they aid the mechanism? 

--- End quote ---

The pin needs to fit snugly and only move in or out when the handles are lined up.

If the pin is to the right (disengaged) and the handles are uneven when the actuator moves to the left, the coupling collar pushes against the left spring.  When the handles are lined up, the spring pushes the pin through the hole in the left throttle flange, locking the handles together.  The spring pushes against the pin which keeps it locked.

When the actuator moves to the right, if there is uneven pressure on the handles, it can cause the pin can bind.  The coupling collar pushes against the right spring.  When the uneven pressure on the handles is released, the spring pushes the pin to the right and it disengages.  The spring pushes against the pin keeping it unlocked.

By using the springs, the hardest pushing/pulling force on the linear actuator is the amount of pressure provided by the springs.  Without the springs, a light actuator could easily exceed specs/fail or a strong actuator could damage the setup.


Scott
Le Chuck:
^ ah.  Makes sense. 
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