Here's a nice little scientific apparatus over-center clamp , one of many types the Knott Apparatus Co. of Boston made over their 36 year existence. The company started in 1896, buying out the E. S. Ritchie Instrument company after the principal passed away in 1895. They became one of the largest suppliers of scientific equipment in America but closed during the Depression.
5 comments:
I don't understand what he over center part does? How does it tighten the clamp? I guess I am too dense to understand?
Hey, wait a minute. I don't understand how it works either!
I wondered the same thing and then realised the cam grips a flat (or small round) piece adjacent to the 'C-clamp' body, not as an assist to the main 'C-clamp', i.e. holding a small item in the C-clamp and them attaching the whole assembly to another bracket with the cam clamp.
Definitely a second purpose...possibly a string?
Look on page 97 of that 1916 catalog, figure 24-35 and you'll see how those clamps are used.
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