That patented release mechanism appears to be superior to the Schweizer hook
by having a slot for the clevis to be captured within. With the Schweizer
assembly, the ring can move forward (towards the release mechanism) and,
with the high upward force applied by a kiting glider, render the release
inoperative. Not so, apparently with the older design.


"son_of_flubber" wrote in message
...
On Saturday, February 8, 2014 6:42:52 PM UTC-5, son_of_flubber wrote:

Here is the 1870 patent for something that look a lot like the Schweitzer
tow hook. Click on the thumbnail for a drawing.

http://www.google.ca/patents/US102067