Locks – Operating mechanism – Key
Reexamination Certificate
2000-01-28
2001-01-09
Barrett, Suzanne Dino (Department: 3627)
Locks
Operating mechanism
Key
C070S375000, C070S453000, C070S423000, C070S373000
Reexamination Certificate
active
06170307
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a Pick-Resistant Lock System with Improved Cylinder Construction and more particularly pertains to a cylinder construction which defeats the use of tensioning devices.
2. Description of the Prior Art
The use of locks of known designs and configurations are known in the prior art. More specifically, locks of known designs and configurations heretofore devised and utilized for the purpose of minimizing the possibility of opening locks without keys are known to consist basically of familiar, expected, and obvious structural configurations, notwithstanding the myriad of designs encompassed by the crowded prior art which has been developed for the fulfillment of countless objectives and requirements.
By way of example, U.S. Pat. No. 1,414,348 to M. Falk discloses a pin-tumbler lock. U.S. Pat. No. 3,478,549 to E. L. Schlage discloses a pick resistant lock unit. U.S. Pat. No. 3,531,959 to E. Weber discloses a security attachment for cylinder lock. U.S. Pat. No. 4,103,526 to Surko, Jr. discloses a pin tumbler lock. U.S. Pat. No. 4,631,941 to Sjunnesson discloses a cylinder lock with permissible service entry. U.S. Pat. No. 4,953,375, to Tzou discloses an electronically self-latching cylinder lock. U.S. Pat. No. 5,361,614, to Metcalf discloses a pin-tumbler lock with retained key and method of operation thereof. U.S. Pat. No. 5,400,629 to Myers discloses an axial pin tumbler lock. U.S. Pat. No. 5,640,865 to Widen discloses a cylinder lock and key combination. Lastly, U.S. Pat. No. 5,475,997 to Chung discloses a lock assembly.
While these devices fulfill their respective, particular objectives and requirements, the aforementioned patents do not describe a Pick-Resistant Lock System and Method that allows abating the friction between lock pins and their supporting bores for thereby precluding the opening of the lock without a key.
In this respect, the Pick-Resistant Lock System and Method according to the present invention substantially departs from the conventional concepts and designs of the prior art, and in doing so provides an apparatus primarily developed for the purpose of abating the friction between lock pins and their supporting bores for thereby precluding the opening of the lock without a key.
Therefore, it can be appreciated that there exists a continuing need for a new and improved Pick-Resistant Lock System with Improve Cylinder Construction which can be used for defeating the using of tensioning devices. In this regard, the present invention substantially fulfills this need.
SUMMARY OF THE INVENTION
In view of the foregoing disadvantages inherent in the known types of locks of known designs and configurations now present in the prior art, the present invention provides an improved Pick-Resistant Lock System and Method. As such, the general purpose of the present invention, which will be described subsequently in greater detail, is to provide a new and improved Pick-Resistant Lock System and Method and method which has all the advantages of the prior art and none of the disadvantages.
To attain this, the present invention essentially comprises a pick resistant lock system for use within a housing having an interior end and an exterior end with an axial cylindrical bore and a plurality of radial bores spaced along the cylindrical bore and constituting a pin chamber, the radial bores having opened ends in communication with the axial bore. The system comprises a main cylinder having interior and exterior ends and a length there between. The main cylinder has radial bores alignable with the radial bores of the housing and a planar key way alignable with the radial bores of the housing when in the locked orientation. A pair of opposed flat regions run the length of the cylinder and are formed opposite the radial bores. A cylindrical casing is fitted about the main cylinder, with the casing having apertures aligned with the radial bores of the main cylinder. The casing further includes a slot running the length of the cylinder. The slot is oriented intermediate the opposed flat regions. The main cylinder and casing are rotatably secured within the axial cylindrical bore of the housing. A facing cylinder is included which has an interior end and an exterior end. The facing cylinder is rotatably secured within the bore of the housing such that the facing cylinder is axially aligned with the main cylinder. The facing cylinder also has an introductory key way alignable with the key way of the main cylinder for receiving a key.
There has thus been outlined, rather broadly, the more important features of the invention in order that the detailed description thereof that follows may be better understood and in order that the present contribution to the art may be better appreciated. There are, of course, additional features of the invention that will be described hereinafter and which will form the subject matter of the claims appended hereto.
In this respect, before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and to the arrangements of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced and carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein are for the purpose of descriptions and should not be regarded as limiting.
As such, those skilled in the art will appreciate that the conception, upon which this disclosure is based, may readily be utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present invention. It is important, therefore, that the claims be regarded as including such equivalent constructions insofar as they do not depart from the spirit and scope of the present invention.
It is therefore an object of the present invention to provide a new and improved cylinder construction for use in a lock, whereby increased pick resistance is achieved.
It is another object of the present invention to provide a pick resistant system which can be readily retrofitted into an existing door.
It is further object of the present invention to provide a new and improved lock which cannot be picked either by traditional tools, screw drivers, or drills.
An even further object of the present invention is to provide a new and improved Pick-Resistant Lock System which is susceptible of a low cost of manufacture with regard to both materials and labor, and which accordingly is then susceptible of low prices of sale to the consuming public, thereby making such Pick-Resistant Lock System and Method economically available to the buying public.
Even still another object of the present invention is to provide a system whereby a tensioning tool is given no room in which to work.
Lastly, it is an object of the present invention to provide a new and improved pick resistant lock system comprising a pick resistant lock system which includes a main cylinder having interior and exterior ends and a length there between. The main cylinder has radial bores and a planar key way, and a pair of opposed flat regions running the length of the cylinder formed opposite the radial bores. A facing cylinder is included which has an interior end and an exterior end in facing relation and axially aligned with the main cylinder. The facing cylinder also has an introductory key way alignable with the key way of the main cylinder for receiving a key.
These together with other objects of the invention, along with the various features of novelty which characterize the invention, are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and the specific objects attained by its uses, reference should be had to the accompanying drawings and descriptive matter in which there is illustrated
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