Buckles – buttons – clasps – etc. – Separable-fastener or required component thereof – Including member having distinct formations and mating...
Patent
1981-04-02
1983-11-08
Swiatek, Robert P.
Buckles, buttons, clasps, etc.
Separable-fastener or required component thereof
Including member having distinct formations and mating...
24645, A44B 1900
Patent
active
044133847
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a locking device for a safety belt comprising a housing, a spring-loaded lock bolt displaceable in said housing, a key that can be inserted into the housing and has at least one recess fitting the lock bolt, an unlocking mechanism, an output element of which engages upon actuation a control-member of the lock bolt and moving said lock bolt against the spring load out of the recess and a blocking mechanism for the output element. Such a locking device is known from Pat. Appl. 7212304, in which the blocking mechanism is formed by the lock bolt and the recess in the key itself. When a tensile force is exerted on the belt and hence on the key, the friction between the lock bolt and the key may increase to an extent such that the effort transferred by a compression spring for unlocking is not sufficient. Since this friction is dependent upon the surface conditions of the lock bolt, of the key and upon the presence of foreign substances, if any, on the contacting surfaces, the effort at which blocking occurs is not reproducible. The invention has for its object inter alia to avoid this disadvantage and provides a locking device of the kind set forth, which is characterized in that the blocking mechanism is provided with a fastening element for the housing which is movable against spring load with respect to the housing, said fastening element in the rest position releasing the path of the output element and blocking said path in the displaced state. With this construction the path of the output element is blocked after a given displacement of the fastening element corresponding to a given tensile force exerted on the key.
By a suitable choice of the spring load of the fastening element the limit value of the effort at which blocking occurs can be adjusted.
In a very suitable embodiment the fastening element cooperates with a spring-loaded lever, one of the two parts mentioned being provided with a lug bearing on a face of the other part which is inclined to the direction of movement of the fastening element, said lever in the drawn-out position of the fastening element extending by a protuberance into the path of the output element and not extending into it in the rest position of the fastening element. This very simple construction permits of arranging the required parts in a small space. Moreover, with such a construction a relatively small displacement between the fastening element and the housing of the locking device will suffice. It is advisable to arrange the lever rotatably on a shaft extending transversely of the direction of displacement of the fastening element.
The invention will be described more fully with reference to the drawing, in which
FIG. 1 is an exploded view of the locking device in accordance with the invention in the state in which a tensile force is exerted on the key,
FIG. 2 shows the locking device of FIG. 1 in the state in which no tensile force is exerted on the key and the unlocking mechanism is energized and
FIG. 3 shows a detail of a variant of the locking device in accordance with the invention.
FIGS. 1 and 2 show a preferred embodiment of a locking device according to the invention, which comprises a housing 1, a lock bolt 3 movable in said housing and loaded by a spring 2 and a key 5 connected with a safety belt 4 and having on both sides recesses 6 one of which is adapted to receive the lock bolt 3 dependent upon the orientation of the key upon insertion. The lock bolt 3 is coupled with a control-member 7 formed by an arm, which is engaged by the output element 8 of an unlocking mechanism indicated schematically by 9. The unlocking mechanism 9 is connected by means of a flexible tie element 10 with the output element 8.
The locking device can be manually operated by means of a knob 11, which can be pressed inwardly against the effort of a compression spring 12 so that the lug 13 connected with the knob 11 pushes the lock bolt out of the recess 6, after which the key 5 can be removed out of the housing. When the key 5 is introduced into the housing 1,
REFERENCES:
patent: 4126919 (1978-11-01), Lassche
patent: 4162715 (1979-07-01), Coulombe
Hakomaki James
Swiatek Robert P.
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