INERTIA SWITCH Russian patent published in 2000 - IPC

FIELD: electromechanical threshold-action inertial sensors. SUBSTANCE: inertia switch has case accommodating permanent magnet, open-circuit contact pair with movable contact in the form of flexible bracket secured on permanent-magnet side, spherical inertia body held in initial position due to magnetic attraction force and mounted for displacement both along bracket and in direction of its crosswise bending. Elastic damping strip is secured on path of inertia body travel at angle ϕ₀ to bracket surface for increasing this angle during inertia body travel. Angle ϕ₀ is chosen within the range of 90^o > ϕ₀ ≥ 2arctg(R/l_s); relationship between elastic bending characteristics of bracket and damping strip is to satisfy condition F_cmin > 0,5n_a•m•sin(2ϕ₀+2Δϕ), where ϕ₀ is initial angle between bracket and plate; R is inertia body radius; l_s is length of strip; F_cmin is minimal force of contact closure; n_a is acceleration along bracket within desired range; m is inertia body mass; Δϕ is angle of inclination increased due to inertial force. EFFECT: provision for multiple operation of switch mounted on moving equipment; improved reliability of circuit switching. 2 cl, 2 dwg