# US 12,007,217 B2 · Compact inertial igniters and impulse switches with accidental activation prevention for munitions and the like > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,007,217 B2 - Document ID: US12007217B2 - Status: Granted - Kind: B2 - Application number: 17/976,701 - Filed: 2022-10-28 - Published: 2023-05-04 - Granted: 2024-06-11 - Earliest claimed: 2021-11-02 - Assignees: Omnitek Partners LLC - Applicants: Omnitek Partners LLC - Inventors: Jacques Fischer; Jahangir S Rastegar - Web page: https://patentgrep.com/patent/US12007217B2 ## CPC - F42C 15/24: wherein the safety or arming action is effected by inertia means (F42C15/196, F42C15/20 take precedence) - F42C 19/06: Electric contact parts specially adapted for use with electric fuzes {(switches operated by change of speed H01H35/06; switches operated by change of acceleration, e.g. shock or vibration, inertia switches H01H35/14; fluid-pressure-operated switches H01H35/24)} - Y02E 60/10: Energy storage using batteries - F42C: AMMUNITION FUZES (blasting cartridge initiators F42B3/10; chemical aspects C06C); ARMING OR SAFETY MEANS THEREFOR (filling fuzes F42B33/02; fitting or extracting primers in or from fuzes F42B33/04; containers for fuzes F42B39/30) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A device including: a body having one or more walls defining an internal cavity, the wall(s) having one or more grooves extending in a longitudinal direction of the internal cavity and extending at least partially along a periphery of the wall(s); a mass movable in the longitudinal direction within the internal cavity, the mass having one or more holes extending in a direction offset from the longitudinal direction; a ball partially disposed in the groove(s) and partially disposed in each hole(s); and an elastic material for biasing the ball towards the groove(s). The groove(s) having a shape such that the acceleration greater than a predetermined acceleration profile causes the ball to first move opposite to the direction of the acceleration and then bounce to move in the direction of the acceleration until the ball(s) moves into the hole(s) to free the mass to move longitudinally opposite to the acceleration. ## Claims ### Claim 1 A device actuated upon an acceleration greater than a predetermined acceleration profile, the device comprising: a body having one or more walls defining an internal cavity, the one or more walls having one or more grooves extending in a longitudinal direction of the internal cavity and extending at least partially along a periphery of the one or more walls; a mass movable in the longitudinal direction within the internal cavity, the mass having one or more holes extending in a direction offset from the longitudinal direction; a ball partially disposed in the one or more grooves and partially disposed in each of the one or more holes; and an elastic material for biasing the ball towards the one or more grooves; wherein the groove has a shape such that the acceleration greater than the predetermined acceleration profile causes the ball to first move opposite to the direction of the acceleration and then bounce to move in the direction of the acceleration until the one or more balls moves into the one or more holes to free the mass to move longitudinally in the direction opposite to the acceleration. ### Claim 2 (depends on 1) The device of claim 1, wherein the body having a single cylindrical wall defining the internal cavity. ### Claim 3 (depends on 1) The device of claim 1, wherein the one or more grooves comprises a single groove extending along an entirely of the periphery of the at least one wall. ### Claim 4 (depends on 3) The device of claim 3, wherein the one or more balls comprises three or more balls. ### Claim 5 (depends on 1) The device of claim 1, wherein the one or more grooves comprises a plurality of grooves, each extending along an entirety of the periphery of the at least one wall. ### Claim 6 (depends on 5) The device of claim 5, wherein the one or more balls comprises three or more balls. ### Claim 7 (depends on 1) The device of claim 1, wherein the one or more grooves comprises three or more grooves, each formed partially along the periphery of the at least one wall, and the one or more balls comprises a ball disposed in each of the three or more grooves. ### Claim 8 (depends on 1) The device of claim 1, wherein at least one of the three or move grooves extends further in the direction opposite to the direction of the acceleration than other of the three of more grooves. ### Claim 9 (depends on 7) The device of claim 7, wherein at least one of the three of more grooves is curved in the direction opposite to the direction of the acceleration. ### Claim 10 (depends on 1) The device of claim 1, wherein the at least one hole extends perpendicular to the longitudinal direction. ### Claim 11 (depends on 1) The device of claim 1, wherein the at least one hole extends at an angle offset from being perpendicular to the longitudinal direction. ### Claim 12 (depends on 1) The device of claim 1, wherein the elastic material is a first elastic material and the device further comprises a second elastic material for biasing the mass in the direction of the acceleration. ### Claim 13 (depends on 1) The device of claim 1, wherein the elastic material is a first elastic material and the device further comprises a second elastic material for biasing the mass in the direction opposite to the direction of the acceleration. ### Claim 14 (depends on 1) The device of claim 1, wherein the shape of the groove includes a first portion inclined at a first angle offset from the longitudinal direction and a second portion inclined at a second angle offset from the longitudinal direction, the second angle being greater than the first angle and the second portion being offset from the first portion in the direction opposite to the direction of the acceleration. ### Claim 15 (depends on 14) The device of claim 14, wherein the shape of the groove further comprises a third portion being offset from the first portion in the direction of the acceleration, the first portion acting as a stop to prevent movement of the ball in the groove in the direction of the acceleration. ### Claim 16 (depends on 1) The device of claim 1, wherein the mass and body are configured to produce a spark when the mass experiences the acceleration greater than the predetermined acceleration profile. ### Claim 17 (depends on 1) The device of claim 1, wherein: one of the mass and the body comprises a projection; an other of the mass and the body comprises percussion primer for producing the spark when the projection impacts the percussion primer; and the other of the mass and the body comprising one or more spark holes for directing the spark out of the body. ### Claim 18 (depends on 1) The device of claim 1, wherein the mass and body are configured to one of open or close an electrical circuit when the mass experiences the acceleration greater than the predetermined acceleration profile. ### Claim 19 (depends on 18) The device of claim 18, wherein the device configures one of a latching switch or a non-latching switch.