G - Physics – 01 – P
Patent
G - Physics
01
P
340/148.92
G01P 15/00 (2006.01) G01P 15/135 (2006.01) H01H 35/14 (2006.01)
Patent
CA 1303698
EXTENDED DWELL SHOCK SENSING DEVICE Abstract of the Disclosure An extended dwell shock sensing device (10) is constructed to operate in two stages. A carriage (34) that includes a magnet (40) is slidably mounted between a first abutment (20) and a second abutment (22). The carriage (34) also includes a cradle (52) in which a non-magnetic mass (54) is slidably mounted between a first wall (53) and a second wall (55). At a rest position, the carriage (34) is biased away from the second abutment (22) by a spring (50) and the non-magnetic mass (54) is biased away from the second wall (55) by a spring (58). A reed switch (24) is mounted to be responsive to the position of the magnet (40). Upon application of an acceleration force, the shock sensing device (10) operates in two stages. In a first stage, the carriage (34) travels to a position where it approaches the second abutment (22), and activates the reed switch (24). In a second stage, the non-magnetic mass (54) travels toward the second wall (55). The inertia of the non-magnetic mass (54) resisting a rapid charge in the return direction of the carriage (54), combined with the relatively long distance to travel back to the first stage position extends the time that the reed switch (24) stays activated.
604054
Borden Ladner Gervais Llp
Hamlin Incorporated
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