Locks – Operating mechanism – Key
Patent
1990-09-12
1991-11-26
Smith, Gary L.
Locks
Operating mechanism
Key
70419, 70358, E05B 2710
Patent
active
050673351
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates generally to cylinder lock systems of the kind described in the international patent application No. PCT/SE87/00038 (WO87/04749), i.e. systems including a cylinder lock comprising: line between said cylinder shell and said key plug; rotational axis thereof for receiving a key blade having an elongated, generally longitudinally extending wave-like code pattern; and elevational movement in an associated transverse cavity in said key plug and a finger projecting transversely outwardly from said body part so as to extend into said key slot and engage with said code pattern of a properly shaped key blade being inserted into the key slot; said locking tumblers being blockingly associated with the cylinder shell either directly or indirectly by means of a fence member so that elevational positioning of said locking tumblers with said properly shaped key blade enables clearence of the shear line.
The lock known from the above-mentioned international application has the special feature of a pivotable finger on each locking tumbler, so that the finger causes the respective tumbler to be specifically rotated when a properly shaped key is being inserted into the lock. Thus, a very high number of code combinations and a good resistance against picking are obtained. However, this feature makes the lock and the key blade relatively complicated and expensive.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a cylinder lock and key system which is somewhat easier and less expensive to manufacture while retaining the most important advantages of the previously known system.
This object is achieved in that the cylinder lock is provided with non-rotatable tumblers and associated fingers.
The inventive concept also includes a cylinder lock and key blade combination system with a master key, and a locking tumbler for use with a cylinder lock.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described more fully below with reference to the appended drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:
FIG. 1 illustrates a key blade in a perspective view;
FIG. 2a is a transverse section along line II--II in FIG. 1;
FIG. 2b is a similar section through a slightly modified key blade;
FIG. 3 illustrates a lock according to the invention to be used in combination with the key blade of FIG. 1, a part of the lock being broken away to show the inside thereof;
FIG. 4 shows, in a larger scale, a partial section through the key plug of the lock of FIG. 3;
FIG. 5 shows a locking tumbler blank in perspective view;
FIGS. 6a-6c show, likewise in perspective views, three different locking tumblers made from a blank as shown in FIG. 5;
FIGS. 6d and 6e show a locking tumbler in side and front views, respectively;
FIGS. 7a-7c show schematically three different locking tumblers in side views;
FIGS. 8a-8c show, in perspective views, three different locking tumblers of a modified kind; and
FIGS. 9a-9c show, in side views and in a larger scale, three different key blades cooperating with locking tumblers as shown in FIGS. 6a-6c, including a master key blade (FIG. 9c).
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The key blade 1 shown in FIG. 1 has a longitudinal axis A of insertion and insertable into the lock shown in FIG. 3.
As shown in FIG. 2a, the key blade generally flat with substantially planar side surfaces 2 and 3. The side surface 2 to the left in FIG. 2a has a minor step 4, and the side surface to the right in FIG
REFERENCES:
patent: 1947105 (1934-05-01), Heyer
patent: 2197952 (1940-04-01), Stone
patent: 3035433 (1962-05-01), Testa
patent: 3080744 (1963-03-01), Spain
patent: 3348392 (1967-10-01), Schreiber
patent: 4478061 (1984-10-01), Preddey
patent: 4603565 (1986-08-01), Strassmeir
patent: 4635455 (1987-01-01), Oliver
patent: 4756177 (1988-07-01), Widen
patent: 4815307 (1989-03-01), Widen
Boucher Darnell
Smith Gary L.
LandOfFree
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