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Why does a vibration sensor have such a tiny and easy to break second "leg"? Why can't this contact be as strong as the other?

Datasheet is at http://www.beelee-switch.com/uploads/soft/120512/18010P.pdf

enter image description here

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  • \$\begingroup\$ It's a switch that works with a small metal ball inside making the contact. Have you ever seen a switch that has only one contact ? I think such a switch would be pretty useless. What do you think ? \$\endgroup\$ – Bimpelrekkie Oct 18 '15 at 10:43
  • \$\begingroup\$ A part number might be helpful. \$\endgroup\$ – Andy aka Oct 18 '15 at 10:44
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    \$\begingroup\$ Part number is in the photo with giant letters ;-) \$\endgroup\$ – Jay CCC Oct 18 '15 at 12:19
  • \$\begingroup\$ I missed the part I said it should only have one contact. The question here aint if it should have one, two or three contacts. I am asking why the second contact has to be so fragile. Maybe now you can post something useful \$\endgroup\$ – Jay CCC Oct 18 '15 at 12:22
  • \$\begingroup\$ @JayCCC You could have put the part number into the question with less typing than your comment about it. \$\endgroup\$ – user1844 Oct 18 '15 at 12:33
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It's not just that one leg is very thin, the other is very thick, to mechanically couple the switch to the board. Both legs are as thin as they can be.

Actually, having looked at the datasheet, the thin leg appears to form the spring around the thick leg, so it being thin allows it to perform the function of both the spring and the component lead in one.

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  • \$\begingroup\$ The thicker contact fits perfectly in a breadboard whereas the thin one breaks very easily. There must be a technical reason why this contact is so thin, but you failed to answer it. \$\endgroup\$ – Jay CCC Oct 18 '15 at 17:36
  • \$\begingroup\$ @JayCCC - No, he answered it, you just didn't understand the answer. Please reread the second sentence. The spring needs to be very thin to allow response which is sensitive enough. \$\endgroup\$ – WhatRoughBeast Oct 18 '15 at 18:07
  • \$\begingroup\$ Inside the component I totally agree, however I am talking about the contact not the spring itself \$\endgroup\$ – Jay CCC Oct 18 '15 at 18:46
  • \$\begingroup\$ @JayCCC it's the same wire, both inside and outside the component body. \$\endgroup\$ – user1844 Oct 18 '15 at 22:27
  • \$\begingroup\$ There's an interesting question of "why isn't the internal spring (or for that matter, the centre conductor) isolated from the physical mounts of the package?" I presume this is an item-cost or manufacturing constraint, and not a design constraint. Other package styles don't always share this design. \$\endgroup\$ – user65586 Oct 19 '15 at 1:18

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