Locks – Operating mechanism – Key
Patent
1994-06-02
1996-12-10
Boucher, Darnell M.
Locks
Operating mechanism
Key
409 81, 409132, 76110, 70406, 70409, 70392, E05B 2700
Patent
active
055820506
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention relates to a cylinder lock-key-combination, and more specifically to a cylinder lock-key-combination of the kind defined in the preamble of claims.
The invention also relates to a key for such a combination, and also to a method of producing such a key from a key blank.
BACKGROUND ART
SE,B, 422,491 (GKN-Stenman) and U.S. Pat. No. 4,393,673 (Widen) describe a combination of this kind in which the key, in addition to a web part, has a side part which includes a coded surface having code parts or shoulders for engagement with an edge part of one end of the respective pin tumblers and with transition parts which extend in the direction of the long axis of the key between mutually adjacent code shoulders. The code shoulders and transition parts of the side part of the key include parts of surfaces which are described by a point or by a line or curve provided with an end point which rotate with said point for said end point at a given distance from a point on an axis which extends generally parallel with the axes of the pin tumblers, said axes moving continuously or discontinuously in a plane that extends through the pin axes or in a plane which is generally parallel therewith.
The pin tumblers may coact with spring-activated top tumblers or may themselves be activated and provided with waisted parts for coaction with outwardly projecting shoulders on a side-bar.
The side-bar is spring-biased outwardly from the cylinder, into engagement with a recess in the lock housing, this recess being configured to urge the side-bar into the cylinder plug as it rotates, subsequent to having inserted the correct key into an operative position in the plug. The side-bar includes a number of lugs having rounded engagement surfaces which coact with waisted parts of the side-bar. In manufacture, the coded surfaces and the intermediate transition surfaces must be produced very accurately, and consequently the cylinder lock taught by this prior publication is comparatively expensive to produce.
U.S. Pat. No. 5,067,335 and SE,B, 455,801 (Widen) describe another type of lock which is provided with a side-bar and the pin tumblers of which are guided forcibly in different directions of rotation and have a form which makes the lock expensive to produce.
U.S. Pat. No. 3,264,852 (Gysin) teaches a cylinder lock with which there is used a key which is provided on the side surfaces thereof with grooves which, when the key is inserted to an operative position in the plug, coact with tumblers that have outwardly projecting pins for engagement in respective grooves. The tumblers of this lock do not coact with a side-bar. Moreover, the pins on the tumblers are subjected to a relatively high degree of wear, which is liable to jeopardize the function of the cylinder lock after long-time use.
Another example of the standpoint of techniques is found in DE,C, 575,828 (Albert Brun in Paris).
OBJECTS OF THE INVENTION
One object of the present invention is to provide a cylinder lock-key-combination which can be manufactured simply and the mutually coacting, movable parts of which will be subjected only to a small degree of friction, causing only slight wear on said movable parts and achieving continued reliable function of the combination over a long period of use.
Another object of the invention is to provide a combination of the aforesaid kind which will function smoothly and effectively even in harsh environments, for instance when the lock is exposed to moisture and/or cold.
A further object of the invention is to provide a cylinder lock of small dimensions which will nevertheless provide an extraordinarily large number of possible combinations, therewith making it difficult to force the lock.
DISCLOSURE OF THE INVENTION
These and other objects of the invention are fulfilled with an inventive cylinder lock-key-combination of the aforesaid kind which is mainly characterized by the features set forth in the characterizing clause of claims.
The mutually coacting engaging and receiving members ensure tha
REFERENCES:
patent: 2687639 (1954-08-01), Swanson
patent: 3035433 (1962-05-01), Testa
patent: 3264852 (1966-08-01), Gysin
patent: 3418833 (1968-12-01), Kerr
patent: 3509749 (1970-05-01), Regan et al.
patent: 4356713 (1982-12-01), Widen
patent: 4393673 (1983-07-01), Widen
patent: 4761976 (1988-08-01), Kleinhany
patent: 4977767 (1990-12-01), Prunbauer
patent: 5067335 (1991-11-01), Widen
patent: 5372024 (1994-12-01), Ruckert
Assa AB
Boucher Darnell M.
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