Extended minimum dwell shock sensor

A shock sensor comprising:

• a) a housing;
• b) an activation magnet slidably mounted to the housing, the magnet having a cylindrical shell portion with portions defining an interior cylindrical cavity of a first diameter and the magnet having a cylindrical ring portion integral with the shell portion and having portions defining a second interior cylindrical cavity coaxial with the shell interior cylindrical cavity and of a diameter which is less than the first diameter;
• c) a reed switch mounted on the housing to be responsive to the position of the activation magnet and coaxial with the magnet such that the reed switch is activated when the magnet travels to a pre-selected activation position during movement of the magnet in response to an initial acceleration force applied to the housing;
• and
• d) a means for biasing the magnet in an unactivated position until the housing is subjected to a pre-selected level of acceleration, such that a pre-selected level of acceleration will cause the magnet to slide on the housing past the pre-selected activation position to activate the reed switch.

A shock sensor comprising:

• a) a housing;
• b) a cylindrical nonmagnetic carriage having an axial length and having portions defining a cylindrical interior cavity;
• c) an annular activation magnet having an axial length less than the carriage axial length and the activation magnet is fixed to the carriage and has portions defining an interior opening which is coaxial with the carriage interior cavity;
• d) a reed switch mounted on the housing to be responsive to the position of the activation magnet and coaxial with the magnet such that the reed switch is activated when the magnet travels to a pre-selected activation position during movement of the carriage in response to an initial acceleration force applied to the housing;
• and
• e) a means for biasing the magnet such that the magnet in a position which does not activate the reed switch when the acceleration force applied to the housing is less than a pre-selected amount.

A shock sensor comprising:

• a) a housing;
• a cylindrical integral activation magnet slidably mounted to the housing, the magnet having a first portion having a magnetic intensity of a certain level and a second portion integrally formed with the first portion and having a greater magnetic intensity;
• c) a reed switch mounted on the housing to be responsive to the position of the activation magnet and coaxial with the magnet such hat the reed switch is activated when the magnet travels to a pre-selected activation position during movement of the carriage in response to an initial acceleration force applied to the housing;
• and
• d) a means for biasing the magnet in an unactivated position until the housing is subjected to a pre-selected level of acceleration such that a pre-selected level of acceleration will cause the magnet to slide on the housing past the pre-selected activation position to activate the reed switch.