Safety belt device for vehicles

Claim 2

A safety belt device for vehicles, comprising a door switch operating when a door is opened and closed, a solenoid valve actuated by the operation of said door switch, vacuum cylinder means connected through said solenoid valve to a vacuum tank which is connected to an intake manifold and including a pistion disposed therein for a reciprocal motion, guide ring means operated by said vacuum cylinder means, and belt means loosely passed through and operated by said guide ring means, said piston being constantly urged to one end of said vacuum cylinder means by a coiled spring and having a free end portion formed with a rack gear which is engaged with a pinion gear fixedly mounted on a drive Shaft.

Claim 3

A safety belt device for vehicles according to claim 1, in which a waist belt is loosely passed through a guide ring which is movable along a guide rail provided in the inside of the door from the upper front portion to the lower rear portion of the door, and a shoulder belt is loosely passed through another guide ring which is movable along another guide rail provided in the door frame, and in which when said solenoid valve is opened, said vacuum cylinder means is communicated with said vacuum tank to move said piston toward the other end thereof against action of the spring for moving said belt means to an operative position and when said solenoid valve is closed, said vacuum cylinder means is communicated with the atmosphere to return said piston to its biased position under action of the spring for moving said belt means to an inoperative position.

Claim 4

A safety belt device for vehicles according to claim 1, in which a seat switch is provided beneath a seat and operates when a rider gets on and off the seat, said solenoid valve being operated only when said seat switch is in an ON position.

Claim 5

A safety belt device for vehicles according to claim 2, in which a pulley drum and a coupling are fixedly mounted on said drive shaft and rotated by said vacuum cylinder means, said pulley drum having a wire for said waist belt connected thereto and moving said wire in a direction such that said waist belt reaches an operative position when operated by the vacuum cylinder means, and said coupling having another wire for said shoulder belt connected thereto and forcing out said other wire, in a direction such that said shoulder belt reaches an operative position when operated by the vacuum cylinder means.