Locks – Special application – For closures
Patent
1988-01-25
1989-12-05
Gall, Lloyd A.
Locks
Special application
For closures
70169, 70231, F16B 4100
Patent
active
048844225
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is concerned with a device for securing automobile wheels from theft, comprising a sleeve which embraces the polygonal head of a wheel nut or bolt, which sleeve is rotatable on the polygonal head and cooperates with a lock cylinder the cylinder plug of which, providing the keyway, controls a locking member with which is associated a radial shoulder for engagement by the locking member, wherein the engagement position of the latter in relation to the radial shoulder is released by rotation of the cylinder plug by a key.
Such a construction is known from U.S. Pat. No. 1,534,446, wherein the polygonal head receives directly the cylinder plug and has diametrically opposed longitudinal slots for the tumblers. The free end of the polygonal head forms a cylindrical stepped-down section and contains therein a slot which extends in the circumferential direction for mounting the locking member which is secured there by a pin. This means that the lock cylinder is itself a component part of the wheel nut or bolt. Because of the multiple slotting the polygonal head has a weakness. Further, the lock cylinder ca be damaged when screwing and unscrewing the polygonal head. After the wheel nut or bolt has been put on, the sleeve has to be pushed onto the polygonal head. In order to secure this in the applied position, the key must be operated to turn the cylinder plug so that it pivots the locking member in order that the latter can extend into the annular groove of the sleeve, forming the radial shoulder. If the sleeve is not pushed on sufficiently far, it may be that the locking member pivots out into the region in front of the annular groove. The sleeve is then not secured against removal.
Based upon the subject matter of the invention is the object of so constructing, in a manner which is simple in terms of production technology, a device of the type set out above that, in addition to the lock cylinder being treated less roughly, applying and securing the sleeve can be facilitated.
SUMMARY OF THE INVENTION
This object is resolved in accordance with the present invention, in a device as set out in the first paragraph above, in that the locking member, which is spring-urged outwardly from the cylinder plug, is in the form of a latch member which snaps in behind the radial shoulder when the sleeve is pushed on to the polygonal head.
As a result of this construction the device is provided with enhanced value in use. The lock cylinder is no longer itself a component part of the wheel nut or bolt. Therefore it is exposed to no danger of damage when screwed on or off. The polygonal head is not weakened by openings extending therethrough. Furthermore, the application of the sleeve containing the lock cylinder can be undertaken without operating the key, more particularly merely by pushing onto the polygonal head. During this application movement the locking member yields resiliently. As soon as the locking member lies in the region behind the radial shoulder of the polygonal head, it can snap in. This latter is clearly audible, so that the applied position is ensured with certainty. This simple mounting of the device leads in turn to a saving in time. The removal of the sleeve can be undertaken only after operation of the key, the locking member having to be guided by the cylinder plug into a release position. By means of a single key several sleeves provided with a lock cylinder can be removed, so that e.g. for a set of sleeves only one key, plus a replacement key, need be supplied.
An advantageous construction is to be seen in that the locking member is in the form of a double-armed latch which extends in the longitudinal direction of the lock cylinder and has a latch head arranged at one end, and further which, in the region of the other latch arm, is embraced by an annular spring extending circumferentially round the cylinder plug. Since the locking member now lies in the region of the tumblers, the device can be of short and light construction. Accordingly, the length is determ
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Deutsch Barry E.
DOM Sicherheitstechnik GmbH & Co KG
Gall Lloyd A.
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