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Why the 2 step height on the SS Castor Assembly?
Posted: Sat Sep 03, 2016 12:46 am
by ERLover
As the title implies, why 2 heights on the assembly when raising it? Is it a mechanically thing or has a purpose?
Re: Why the 2 step height on the SS Castor Assembly?
Posted: Sat Sep 03, 2016 12:57 am
by JPG
Here's the way I see it.
You are limited as to the distance the pedal will move when stepped on.
Also the amount of force attained by that stepping.
A force-distance design tradeoff.
Since that results in only a slight raising(s/b 1/4 ") a second 'step' is included to get it up 1/2" off the ground so as to clear small objects.
A third step causes it to return to the ground.
Been that way since the '40's'.
Re: Why the 2 step height on the SS Castor Assembly?
Posted: Sat Sep 03, 2016 1:05 am
by ERLover
So it has to be a rotational thing, how far the lever moves, in ratio to the cams elliptical curve, and how much rotational clearance for the levers, in relationship to how it is mounted on the legs.
Re: Why the 2 step height on the SS Castor Assembly?
Posted: Sat Sep 03, 2016 1:11 am
by JPG
Sorta!
Those are all interdependent design parameters.
Stepped cam, not 'elliptical'.
Nite nite Michael!
Re: Why the 2 step height on the SS Castor Assembly?
Posted: Sat Sep 03, 2016 1:23 am
by ERLover
JPG wrote:Sorta!
Those are all interdependent design parameters.
Stepped cam, not 'elliptical'.
Nite nite Michael!
Nighty Night JPG
Re: Why the 2 step height on the SS Castor Assembly?
Posted: Sun Sep 04, 2016 8:13 am
by garys
I never questioned why. I just got used to the 3 step system and I like it because it works every time.
Re: Why the 2 step height on the SS Castor Assembly?
Posted: Sun Sep 04, 2016 10:09 am
by JPG
Bottom line - That's the way Hans designed it. Why is for speculation.
Re: Why the 2 step height on the SS Castor Assembly?
Posted: Wed Sep 07, 2016 2:24 pm
by everettdavis
I am not an engineer, as Hans was, but it seems to get the full clearance lift without the two step cam process, could you envision the contortion it might take with your foot to make it lift in one pass, and the other step to put it back down?
I know it has always been that way, and it works. Thank goodness they kept it that way through the years which makes obtaining parts and updates possible. What a difference the Caster upgrade makes!
Everett
Re: Why the 2 step height on the SS Castor Assembly?
Posted: Wed Sep 07, 2016 2:49 pm
by charlese
Easy for me! like to keep things simple. One lift on the castors will allow me to roll the machine across my concrete floor. Two lifts will allow me to move the machine onto my rubber floor cushion. Three clicks sets the machine wherever it is put.
Re: Why the 2 step height on the SS Castor Assembly?
Posted: Wed Sep 07, 2016 6:24 pm
by ERLover
everettdavis wrote:I am not an engineer, as Hans was, but it seems to get the full clearance lift without the two step cam process, could you envision the contortion it might take with your foot to make it lift in one pass, and the other step to put it back down?
I know it has always been that way, and it works. Thank goodness they kept it that way through the years which makes obtaining parts and updates possible. What a difference the Caster upgrade makes!
Everett
I have a tendency to think that is why.