Abstract An automatic locking device for a safety belt for retaining a person in a vehicle comprising a rotor shaft rotatable in a casing for reeling up the belt and a rotor rotatable together with the shaft and means to lock the rotor to the casing in response to centripetal forces produced by withdrawal of the belt. The device includes a two-armed locking member mounted on a horizontal shaft carried by a cover plate substantially transversally to the shaft of the rotor and adapted on acceleration or deceleration forces exceeding a predetermined value actuate a swingable element which is suspended pivotably relatively to said cover plate to take a position releasing the means locking the rotor relative the casing. By mounting the swingable element at an upper point freely pivotable on the cover plate and forming it on both sides of one arm of the two-armed locking member with cam surfaces, the force necessary for actuating the swingable element is reduced and the weight of the locking device is a reduced weight and its reactivity and reliability is improved. In addition the two-armed locking member can be mounted on a shaft extending in other than the horizontal direction.
In an automatic locking device for a safety belt for retaining a person in a vehicle, comprising a rotor shaft (5) mounted rotatably within a casing for reeling up the belt and a rotor (10) rotatable together with the shaft, on the circumference of which rotor at least one locking pawl (12) is disposed movable outwardly in response to centripetal forces coming into existence when the belt is withdrawn, said locking pawl being adapted to cooperate with one or several locking pawl teeth (13) in the casing and a two-armed locking member (25) mounted on a horizontal shaft (21) carried by a cover plate (23) substantially transversally to the shaft (5) of the rotor, said locking member having a first arm and a second arm (34) which second arm cooperates with a swingable element (31) suspended pivotably relatively to said cover plate and adapted on acceleration or deceleration forces exceeding a predetermined value to swing the second arm (34) so as to cause the first arm to be swung into a releasing position actuating the locking pawl, in which position said locking pawl engages a pawl locking tooth for locking the rotor relative the casing, cam surfaces (35, 36) being formEd on the swingable element in a plane substantially parallel to that of the cover plate to bring about said swinging movement of the arms, the characterizing feature that the swingable element (31) at an upper point (30) is mounted freely pivotable on said cover plate (23) and on both sides of said second arm (34) formed with the cam surfaces (35, 36).
Claim 2
Dependent Claim
263 words
In an automatic locking device for a safety belt for retaining a person in a vehicle, comprising a rotor shaft (5) mounted rotatably within a casing for reeling up the belt and a rotor (10) rotatable together with the shaft, on the circumference of which rotor at least one locking pawl (12) is disposed movable outwardly in response to centripetal forces coming into existence when the belt is withdrawn, said locking pawl being adapted to cooperate with one or several locking pawl teeth (13) in the casing and a two-armed locking member (25) mounted on a horizontal shaft (21) carried by a cover plate (23) substantially transversally to the shaft (5) of the rotor, said locking member having a first arm and a second arm (34) which second arm cooperates with a swingable element (31) suspended pivotably relatively to said cover plate and adapted on acceleration or deceleration forces exceeding a predetermined value to swing the second arm (34) so as to cause the first arm to be swung into a releasing position actuating the locking pawl, in which position said locking pawl engages a pawl locking tooth for locking the rotor relative the casing, cam surfaces (35, 36) being formEd on the swingable element in a plane substantially parallel to that of the cover plate to bring about said swinging movement of the arms, the characterizing feature that the swingable element (31) at an upper point (30) is mounted freely pivotable on said cover plate (23) and on both sides of said second arm (34) formed with the cam surfaces (35, 36).
Claim 3
Dependent Claim
38 words
In the device as claimed in claim 1, the further characterizing feature that the swingable element (31) is suspended from an outwards bent pin (30) formed by punching from the cover plate (23) made of sheet plate material.
Claim 4
Dependent Claim
79 words
In the device as claimed in claim 1, the further characterizing feature that the swingable element (31) is disc-shaped and has a central opening (32) for the locking member (25) and that a portion (33) of the swingable element located between the second arm (34) and said cover plate (23) is bent towards said cover plate to form a sliding surface (42) bearing against a fixed surface and the two cam surfaces (35, 36) defining said sliding surface (42).