Flexible Plate Switch

Section VII

No. 3

This pressure sensitive switch if used for initiating emplaced mines and explosives.


  • Two flexible metal sheets one approximately 10 in. (25 cm) square one approximately 10 in. x 8 in.(20 cm)
  • Piece of wood 10 in. square by 1 in. thick
  • Four soft wood blocks 1 in.x 1 in.x 1/4 in.
  • Eight flat head nails, 1 in. long
  • Connecting wires
  • Adhesive tape

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1. Nail 10 in. x 8 in. metal sheet to 10 in. square piece of wood so that 1 in. of wood shows on each side of metal. Leave one of the nails sticking up about 1/4 in.

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2. Strip insulation from the end of one connecting wire. Wrap this end around the nail and drive the nail all the way in.

28 31 Flexible Plate Switch

3. Place the four wood blocks on the corners of the wood base.

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4. Place the 10 in. square flexible metal sheet so that it rests on the blocks in line with the wood base.

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5. Drive four nails through the metal sheet and the blocks to fasten to the wood base. A second connecting wire is attached to one of the nails as in Step 2.

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6. Wrap adhesive tape around the edges of the plate and wood base. This will assure that no dirt or other foreign matter will get between the plates and prevent the switch from operating.

28 71 Flexible Plate Switch


The switch is placed in a hole in the path of expected traffic and covered with a thin layer of dirt or other camouflaging material. The mine or other explosive device connected to the switch can be buried with the switch or emplaced elsewhere as desired.

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When a vehicle passes over the switch, the two metal plates make contact closing the firing circuit.

28 9 Flexible Plate Switch

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