86. Concrete Stake Mine (Stockmine; Sto.Mi.)

a. Description. The antipersonnel concrete stake mine (fig. 106) consists of a main char-ge surrounded by a concrete case which is embedded with metal fragments. The German 100-gram (0.25 pound) standard bore-hole charge is used as the main charge. The mine istself is 6 1/2 inches long and 3 inches in diameter. A round wooden stake, 14 inches long and 1 1/2 inches in diameter, is set in the lower end of the concrete shell. Total weight of the main is 4.5 pounds. The mine normally uses the pull fuze 42 (par. 42), but the pull fuze 35 (par. 44) can also be used. It has an effective casualty radius of 10 yards and a danger-area radius up to 66 yards. This mine has been founded with a ser-rated, cast-iron cylinder placed around the concrete hole to add fragmentation effect. The mine is similar to the Soviet POMZ-2 stake mine (TM 5-223A).

b. Employment. This mine is used with trip wires to block trails and other routes of ap-proach to unit position. It is also employed in antitank mine fields to hinder, and warn of reconnaissance and breaching parties.

c. Functioning. A pull on wire trip wire withdraws the striker-retaining pin from the striker shaft, releasing the spring-loaded striker against the percussion cap and firing the mine.

d. Installing and Arming.

(1)

Drive the stake into the ground until about 5 inches of it remains above the ground.

(2)

Assemble the mine by inserting the main charge, fuze-well end first, in the large hole in the bottom of the concrete shell.

(3)

Insert a pull fuze 42, with detonator or a pull fuze 35, with detonator, into the small hole in the top of the concrete case and screw it into the fuze well of the main charge.

(4)

Put the mine on the stake; or, if a tree is used, tie the mine to the tree and plug the hole in the bottom. The Germans provided a cork plug for this. If the pull fuze 35 is used, drive a second stake, beside the mine, keeping it higher then the mine so that the trip wire will run up over it and pull upward on the fuze when it is trip-ped.

(5)

Anchor the trip wire.

(6)

Attach the loose trip wire to the fuze.

(7)

Pull out the safety pin if the pull fuze 35 is used.

e. Neutralizing.

(1)

If the pull fuze 42 is used, hold the striker-retaining pin firmly in place and cut the trip wire. If the pull fuze 35 is used, insert a nail or wire in the safety-pin hole of the fuze and then cut the trip wire.

(2)

Unscrew the fuze and detonator.

(3)

Remove the detonator from the fuze.

(4)

Pull the mine and stake loose with wire or rope from a distance of 50 yards since the stake may be booby-trapped.

(5)

Remove the stake and the main charge from the mine.

f. Packing. These mines are packed six to a wooden chest. The weight of the mines and  chest is about 39 pounds. A separate bundle of six stakes is supplied with each chest of mines.

Figure 106. Concrete stake mine.