Winding – tensioning – or guiding – Strand tensioning device – Tortuous course
Patent
1982-11-15
1985-05-21
Jillions, John M.
Winding, tensioning, or guiding
Strand tensioning device
Tortuous course
A62B 3502, B65H 7548
Patent
active
045181314
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an inertial element as a control mechanism for the locking members of belt reeling mechanisms, particularly for safety belts in motor vehicles, with at least belt-sensitive blocking of the belt winding spindle, which can be connected to the belt winding spindle and is preferably in the form of a dish-shaped wheel, with a component serving to increase the mass moment of inertia, and with a return spring.
In self-locking belt reeling mechanisms, as the unrolling movement of the safety belt accelerates, the belt winding spindle is blocked and the belt cannot be unwound further. This is effected by the fact that a locking member mounted on the belt winding spindle and rotating therewith is deflected by a control mechanism, via a suitable connection, until the locking member engages in teeth integral with the housing, thereby blocking the movement of rotation of the belt winding spindle. For this purpose, the control mechanism has a greater mass moment of inertia than the locking member, with the result that, as the unrolling movement of the safety belt accelerates accordingly, the sluggish control mechanism (inertial element) lags behind the movement of rotation of the belt winding spindle with the locking member, and deflects the locking member (belt-sensitive system).
In addition, the control member may also be provided with stops for a lever which can be actuated by a sensor responding to acceleration of the vehicle (vehicle-sensitive system). When the sensor responds, the movement of rotation of the control mechanism, which is constructed as an inertial element, is stopped, with the result that it again lags behind the movement of rotation of the belt winding spindle having the locking member, and deflects the locking member.
PRIOR ART
The known inertial elements are constructed and produced predominantly as masses of pure plastics or metal.
A known inertial element (German Auslegeschrift 25 11 503) consists of a steel ring which is mounted with a running fit directly on the locking member, with a plastics ring being mounted by press fitting on the periphery of the steel ring, the plastics ring cooperating, via cams formed thereon, with control cams of the locking member in order to actuate the latter. The disadvantage of this is that the manufacture of the connection of the steel ring and plastics ring is complex and requires exact dimensioning of the parts. Indeed, the non-slip qualities are subject to stringent requirements, since otherwise the relative movement relative to the locking member, caused by the mass moment of inertia of the steel ring, cannot be effectively converted into actuation of said locking member.
Furthermore, inertial elements are known wherein a metal disc is used in the form of a fixedly mounted component embedded in an injection-molded plastic component which is injection-molded around said metal disc. The disadvantage of inertial elements of this type is their complexity of manufacture. Therefore, the production costs for inertial elements of this type are also comparatively high.
SUMMARY OF THE INVENTION
Starting from the prior art described, the object of the present invention is to provide an inertial element which is simple and cheap to manufacture, and at the same time is reliable in operation.
The inertial element of the present invention is characterized primarily in that the component which serves to increase the mass moment of inertia is formed as a separate ring, especially a metallic ring, which surrounds the axis of the belt winding spindle yet is spaced therefrom, and is supported on projections provided on the inertial element.
According to specific features of the present invention, the ring may be produced as a turned or stamped part, or may be produced by bending wire. The ring may be quadrilateral, preferably rectangular, in cross section, or may be circular in cross section.
The wire ring may have a gap into which a projection formed on the inertial element projects. The ring and projection may be
REFERENCES:
patent: 4027829 (1977-06-01), Stephenson
patent: 4083512 (1978-04-01), Rumpf
Butenop Klaus
Singer Klaus-Peter
Autoflug GmbH
Jillions John M.
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