[python] Re: Bipolar update
- From: Vi Vuong <vi_vuong@xxxxxxxxx>
- To: "python@xxxxxxxxxxxxx" <python@xxxxxxxxxxxxx>
- Date: Mon, 28 Nov 2011 20:48:26 -0800 (PST)
Claim 1 mentions the pivot acute angle, and the rider's weight stabilizes the
steering wheel...
Yes, all the claims seem to focus on skateboard.
Regarding wheel shimmy, I couldn't feel much difference from the rear wheel
today on the trail ~10mph. However, the full seat makes a big difference in
controlling the bike with upper back, including pedal force. The old seat back
was free to swivel for folding, but took out lots of control / comfort...
Vi
>________________________________
> From: Dirk Bonné <dirk.bonne@xxxxxxx>
>To: python@xxxxxxxxxxxxx
>Sent: Monday, November 28, 2011 4:14 AM
>Subject: [python] Re: Bipolar update
>
>
>On 27.11.2011 20:26, Vi Vuong wrote:
>In the mean time, the Dirtsurfer with similar wheel setup seem to do OK at
>higher speed,
>>"The board is unique in that it incorporates a patented steering
>>geometry [2] where the front wheel pivots from a point in front of and below
>>the axle of the wheel, via the 'Swingarm'. The rider's weight automatically
>>centres and straightens the front wheel, creating stability and control.
>>Another feature of the Dirtsurfer which is not found on other four-wheeled
>>boards is that, much like a bicycle, the stability actually increases with
>>speed, thanks to the gyroscopic action of the large wheels."
>> http://en.wikipedia.org/wiki/Dirtsurfing
>>Looks like the pivot rise design is
>>patented, http://www.google.com/patents?vid=USPAT6398237
>>
>>
I am not a specialist on patents, but I can only see that the scope of the
patent is the skateboard. The invention is not about the geometry, but is part
of an application in the skateboard. It cannot be the pivot anyway because
there is prior art: all the shopping carts use this geometry: pivot in front of
wheel, negative angle.
>
>Dirk
>
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