| 摘要 |
A contact of a fire alarm device base relates to fire safety and may be used in fire alarm systems for connection of conductors and elements of a fire alarm loop by means of base contacts to contacts of input circuits of the removable fire alarm device. The contact of the fire alarm device base comprising a conductive resilient plate with holes for fixation to insulation bottom of the base, and also for screw connections with conductors of the fire alarm loop being located at plate edge, screw connections of fire alarm loop conductors consists of a metal screw with a metal square washer, which contacts by means of a hole at plate edge with a hex nut, fixation of the square washer is realized with use of one or two limiters located in perpendicular to plate edge line in its plane and perpendicular to plate surface, height of each above the plate is more than height of the square washer, and one or two conductors or terminals of fire alarm loop elements that installed between the plate and the square washer, length of each ones is not less than side of the square washer, limiters are located at the distances from screw axis being equal to a half of square washer side. The proposed contact device for the base of the removable fire alarm device due to using square washer with one or two limiters it is provided better and more reliable connection of conductors and elements of the fire alarm loop with the contact of fire alarm device base. |
