Time delay latch device
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United States of America Patent
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-
Mar 25, 2003
Grant Date -
N/A
app pub date -
Jun 20, 2001
filing date -
Jun 20, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A time delay latch device of the arming assembly of a delay fuze which replaces the current system in support of the U.S. Navy Mine Clearing Program. The time delay mechanism is a mechanical run-away escapement having a one-half pound release force that unlatches an 800-pound load. The mechanical force reduction mechanism that makes up the latch device consists of 10 components rather than the existing 31 and a pyrotechnic time delay mechanism consisting of two components in lieu of the existing 14. Hence, the latch device taught herein provides not only the requisite delay and required latch release force but also reduces the total number of components from 44 to 12; thus creating significant cost savings in manufacturing. Time delay latch mechanism is located within the ram shaft that holds the ram shaft spring captive between the ram shafts and housing. The latching mechanism for the ram shaft comprises two ball detents located within the ram shaft and held in place by the housing. Ball detents hold captive a firing pin detent that holds under compression a firing pin spring. A pyrotechnic timing and release element contains a primer, a pyrotechnic delay mix and a propellant.
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