Winding – tensioning – or guiding – Strand tensioning device – Tortuous course
Patent
1980-11-05
1982-07-27
Jillions, John M.
Winding, tensioning, or guiding
Strand tensioning device
Tortuous course
A62B 3502, B65H 7548
Patent
active
043413609
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a locking means for safety belts of the reel belt type intended for use preferably in vehicles, and provided with a strap webbing, which against the bias of a spring can be unwound from a strap winding-up device comprising a strap reel rotatably journalled therein, a pawl mechanism, which is changeable between a position releasing the strap reel and a locking position, in which the strap reel is maintained locked against rotation in one direction, to the locking means comprises an activating means for the change-over of the pawl mechanism to a locked position, when the activating means is subjected to an acceleration exceeding a predetermined value, and comprising for one thing a body of inertia having a determined basal surface, which body can occupy a central rest position with the basal surface resting on a carrying surface, or a peripheral activated position, in which the body of inertia is tilted about a first pivoting center, and a transmission element arranged to be able to rest against a carrying surface and provided with a contact surface arranged to cooperate with the pawl mechanism and a sensor portion by cooperation with the body of inertia provided to sense its positions. The transmission element is arranged to rest against its carrying surface, when the body of inertia is in its rest position, in which the contact surface occupies a position, in which the pawl mechanism is free to occupy its releasing position, whereas the body of inertia is displaced from its rest position into the activated position, when said body of inertia is influenced by said acceleration exceeding the predetermined value, and displaces the transmission element, thereby causing a displacement of the contact surface. The pawl mechanism is arranged to occupy its locking position under the influence of the displacement of the contact surface.
BACKGROUND
Locking means of the actual kind are intended to lock, in dependence of an activating means actuated by forces of inertia, a reel with a strap webbing against the unwinding of said strap webbing wound onto said reel and to release the reel for the unwinding of said strap webbing respectively. Rigid requirements are set forth as to the function of such activating means with respect to, by way of example, reliability, sensitivity, quick response, resetting function etc., and it is an object to provide an activating means, which to the utmost possible extent can be dimensioned to produce the best result. It is further an object that the necessary angle of inclination of the activating means relative to the horizontal plane is substantially as great for the resetting operation as for the activation of the activating means. This has not been possible to achieve in a satisfactory manner, which in the first place is due to the great friction between the different parts of the activating means. Owing to this the safety belt has been maintained in locked condition during an unfavorably long period of time after the activation, which has thus meant a hindrance for the user of the safety belt.
It is therefore an object of the present invention to provide a locking means, in which the activating means can be designed in such a way that the friction forces can be kept small and substantially unchanged with respect to time. Hereby it is thus possible to provide the locking means with the best characteristics in order to fulfill great demands on the function of the means.
THE SOLUTION
The object is obtained by means of a locking means which is characterized by the combination of the activating means having a second pivoting center, about which the transmission element is arranged to pivot in connection with the change-over of the body of inertia between the rest position and the activated position, and of the sensor portion of the transmission element comprising a shank, which in the rest position occupies a centric position relative to the axis of symmetry of the body of inertia. The shank is provided at a third pivoting center for
REFERENCES:
patent: 3967510 (1976-07-01), Lindblad
patent: 4018400 (1977-04-01), Henderson
patent: 4050644 (1977-09-01), Fohl
patent: 4135410 (1979-01-01), Filderman
patent: 4148447 (1979-04-01), Lindblad
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