Patent ID: 7690051
Filing Date: 2010-04-06
Classification: A62B

Abstract:
1. A harness type safety belt comprising a pair of shoulder part belts which intersect on a back of the body of a user and are hung on both shoulders; a pair of annular thigh part belts into which both thigh parts of the body of the user are inserted respectively; a waist part belt mounted on a waist part of the body of the user; and a connection part capable of connecting a rope to an intersecting part of the shoulder part belts, comprising: an air bag provided in a predetermined position of said pair of shoulder part belts, said pair of annular thigh part belts and said waist part belt; inflation means for inflating the air bag; fall detection means for detecting a fall of the body of the user; and control means for inflating the air bag when the fall detection means detects a fall of the body of the user, the control means is configured to inflate the air bag when such a state that the dropping state is detected by the drop sensor continues for not less than a predetermined time period except a time period up to the elapse of the predetermined time period after the acceleration sensor detects an occurrence of acceleration of not less than the predetermined level, wherein: each of the drop sensors is configured by a cylindrically formed container; a fixed contact point provided in an inner circumferential plane of the container; a plurality of movable contact points being elastic and deformable and arranged to be spaced apart from one another in a circumferential direction inside the container; and an inertia body elastically deforming, with its own weight, the movable contact points to come into contact with the fixed contact point, and drop sensors are arranged on the same approximately vertical plane so that axial centers of containers make a predetermined inclination angle one another; the acceleration sensor is configured by a cylindrically formed container; a fixed contact point provided in an inner circumferential plane of the container; a plurality of movable contact points being elastic and deformable and arranged to be spaced apart from one another in a circumferential direction inside the container; and an inertia body elastically deforming the movable contact points to come into contact with the fixed contact point at an occurrence of acceleration of not less than a predetermined level larger than acceleration due to gravity, and is arranged so that an axial center of the container is approximately parallel to a horizontal direction; the control means inflates the air bag when such a state that the movable contact points and the fixed contact points of all the drop sensors are detected being non-conductive continues for not less than a predetermined time period except a time period up to the elapse of the predetermined time period after the movable contact points and the fixed contact point of the acceleration sensor are detected being conductive.