Locks – Operating mechanism – Key
Patent
1987-12-14
1990-03-06
Gall, Lloyd A.
Locks
Operating mechanism
Key
70493, E05B 2704
Patent
active
049054899
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a tumbler in a cylinder lock having a core pin and a spring-loaded housing pin, which are supported in a radial bore of the cylinder housing and in a bore of the cylinder core, respectively, and which are brought into alignment by an insertable key introduced into the key channel.
2. The Prior Art
Cylinder locks having two-part tumblers are well known and have a high degree of security. However, unlocking methods have now been developed with which these cylinder locks can be opened without keys and without externally apparent damage to the locks.
SUMMARY OF THE INVENTION
It is now the object of the invention to devise a cylinder lock of the above type which cannot be opened with these methods.
This object is attained in accordance with the invention by providing that the core pin has a sheathlike slide element, which is disposed behind the head of the core pin and is displaceable in the longitudinal direction with respect to the bore and to the core pin. The effective portion of the tumber always remains movable if the aforementioned unlocking methods are used, so that its measurements cannot be learned. Unlocking methods involving the use of force also fail, because once again the effective portion of the core pin cannot be fixed in place.
The tumbler according to the invention is simple to mass produce. No modifications to the other parts of the cylinder lock or to the key are necessary. The cylinder lock can be adequately secured against the above unlocking methods by using at least one tumbler according to the invention, along with the usual tumblers, in the cylinder lock.
By manufacturing the tip of the core pin as a separate part and securing the tip with an interference fit on the pin body, it becomes possible to make the tip from a material that is especially secure against being drilled open. If the tip is made from a hard metal material, wearing down of the tip from use is moreover largely avoided.
The embodiment of the tumbler in which the core pin has a bore, in which a locking pin that is displaceable in the longitudinal direction with an outward limitation by a stop is supported, and disposed in the bore is a compression spring, which presses in a biased manner upon the locking pin, which in turn presses against the housing pin additionally prevents unlocking methods in which the core and housing pins are separated so that the rotor can be rotated briefly.
Further advantageous embodiments are disclosed in the dependent claims.
BRIEF DESCRIPTION OF THE DRAWINGS
Exemplary embodiments of the invention will be described below in further detail, referring to the drawings, in which:
FIG. 1 shows a longitudinal section through a core pin;
FIG. 2 shows a cross section through a portion of a cylinder lock with a tumbler inserted, the tumbler being shown partly in projection and partly in section;
FIGS. 3a and 3b shows a cross section through a cylinder lock with a tumbler in accordance with a variant of the present invention; and
FIG. 4 shows a longitudinal section through a core pin in accordance with a further version of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
In a known manner, the lock cylinder shown in FIG. 2 has a stationary cylinder housing 12, which is located in a cylindrical sheath 11 and in which a cylinder core 13 is rotatably disposed. The cylinder housing 12 and the cylinder core 13 have radial bores 17a and 17b, in which spring-loaded tumblers are displaceably supported. One spring 16 is located in each housing bore 17a, supported against the sheath 11 and pressing in a biased manner against a housing pin 15, which in turn presses a core pin 10 radially inward against a key that is to be introduced into the key channel 14.
As FIG. 1 shows, the core pin 10 has a tip 3, which includes a connecting portion 3a and a head 3b having a control face. The head 3b may also have a plurality of control faces, however, to increase the number of locking possibilities in a known ma
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