Importance

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Abstract

The safe and arming device comprises a housing containing a setback weight movable rearwardly against the resistance of springs in response to forward acceleration of the housing. A fire tube in the housing has a fire tube opening, blocked initially by first and second swingable inertial arming lugs. The weight carries a pin having a first portion initially received in a first opening in the first lug for retaining it in its safe position. The setback of the weight withdraws the first pin portion from the first opening. Spin acceleration causes swinging of the first lug to its arming position wherein a detonator on the lug is aligned with the fire tube opening. The lug has a second opening for receiving a second pin portion when the weight is spring-returned after cessation of the acceleration, whereby the lug's arming position is maintained. The second lug has a third opening for receiving a third pin portion to maintain the safe position of the second lug. When the housing decelerates due to air friction, the weight moves forwardly and releases the second lug. Negative spin acceleration or a spring causes the second lug to swing to its arming position wherein an opening therein is aligned with the fire tube opening. A latch retains the second lug in its arming position. The first lug has a ramp, engageable by the first pin portion to return such lug to its safe position if it is only partially swung toward its arming position.

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First Claim