1906 Rover

A guide to 6HP Rover cars


Puzzle picture

Friday, April 2nd, 2010

Can you explain this?

Two obstruction spanners and a normal spanner

Why  should the two spanners on the right be structuraly stronger, when used correctly, than the one on the left?  Answers please.

2 Responses to “Puzzle picture”

  1. Robin Wilson says:

    The one on the left has both “ears” cantilevered off the handle and so each can bend at the neck.
    The other 2 both have one ear reinforced by the handle, leaving only one cantilevered or bendy ear.

  2. Chris Berridge says:

    I guess the obstruction spanners must work like a pair of stilsons where the grip on the nut increases from the bottom jaw (the one welded to the handle) as the torque increases by virtue of flexing of the spanner jaws. As Robin says, the short jaw on the normal spanner can bend away from the nut so opening the jaws and reducing grip on the nut. I must go and make one immediately….!

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