JPH02304182A - High safety cylinder - Google Patents

Abstract

PURPOSE: To impart high safety resisting lock picking by providing both a housing and a core with respective first and second holes, and providing two sets of slidable tumbler means. CONSTITUTION: A cylindrical housing 14 is provided with a first and a second holes and a core 12 enclosed in the housing 14 is also provided with a first and a second holes. A first tumbler means comprising two tumblers 26, 28 is provided in such a way as to be slidable within the respective first holes in the housing 14 and the core 12 and a second tumbler means comprising two tumblers 32, 34 is slidably provided within the second holes. When a cylinder lock 10 is in a locking position, each tumbler beams resists radial movement during relative movement between the core 12 and the housing 14 so as to prevent lock picking.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates generally to cylinder locks having a core, a housing and a tumbler which cooperate to form a locking mechanism, and more particularly to a cylinder lock having a core, a housing and a tumbler which cooperate to form a locking mechanism, and more particularly to Concerning highly secure cylinder locks that resist technology.

[Problems to be solved by conventional techniques and inventions] Currently,
Various types of cylinder locks are used. Cylinder locks typically include a key plug or core rotatably mounted within a cylinder housing and a lock mechanism that prevents rotation of the core if the correct key is not inserted into the keyway. The lock mechanism typically has either a tumbler and a sidebar, or a combination thereof. Typically, the insertion of a key that matches the lock (hereinafter referred to as
The "correct key") raises the tumbler above the shear line formed by the outer surface of the core and the inner surface of the housing.

Tumbler-type locks typically consist of a plurality of tumblers that are reciprocally mounted within matching bores of the core and housing. The tumbler, which usually consists of a cylindrically shaped bottle, is typically spring biased across the shear line, and the tumbler typically crosses the shear line when the correct key is not inserted into the lock. The tumbler thus prevents the core from rotating within the housing when the correct key is not used.

The tumbler lock mechanism has two mating surfaces at the separation point.
It is also possible to have a tumbler each constructed from two separate tumbler parts or segments.

Each of the tumblers has a spring-loaded plug tumbler.
and a change tumbler. The tumbler detects when the correct key is inserted into the keyway (more specifically,
Separation of the plug tumbler and change tumbler occurs at a shear line (described below).

The plug tumbler is biased radially inwardly into the core so that the plug tumbler crosses and blocks the shear line when the correct key is not inserted into the keyway of the lock. The tumbler thus prevents the core from rotating within the housing, thereby configuring the locking position for the lock. When the correct key is inserted into the lock, the key
The change tumbler is moved radially outward to a position such that separation of the plug and change tumbler occurs at the shear line. This position of the tumbler constitutes the open or unlocked position of the lock.

A suitable or correct key for a lock typically has a plurality of bits, or notches, each having a different height along the top edge of the key. These cuts force the change tumbler radially outward, aligning the separating plane of the two tumbler sections with the shear line, thereby causing rotation of the key plug.

These conventional pin-tumbler type cylinder lock structures are opened using known lock-breaking techniques. Typically, these known techniques use tools to apply pressure to the cylinder core to create relative deformation between the core and the housing.

This pulling motion causes the tumbler pin to move in the radial direction (
That is, the tumbler pin is locked in the bore of the housing so as to resist movement (along the longitudinal axis of the tumbler). That is, when the locking force resulting from the pulling motion exceeds the spring biasing force, the tumbler is moved radially outward and is not returned by the spring biasing force. Another tool is then used to lift the cylinder pin to intersect the shear line.

Another lockbreaking technique (commonly referred to as impressionization) involves inserting a blank key into the keyway and turning it so that the impression mark indicates the position of the tumbler. The marks are then used to form a key to open the lock.

To this end, a number of improved lock structures have been developed and
It has been used to counter these lock-breaking techniques. These improved lock configurations typically include different radially arranged tumblers, a side bar, a tumbler 1 and a tumbler with a notch bit that cooperates with a notch in the key to rotate the tumbler. This includes the use of various other configurations.

For example, U.S. Pat. No. 4,434,636 (Brunbauer) discloses that, in addition to the usual pin-type tumbler, an auxiliary tumbler is used to form a mechanism. A cylinder lock having a stylus-deeler element is disclosed. In the lock position, the upper surface of the auxiliary tumbler engages a cam-like blocking recess in the housing, preventing rotation of the core. The stylus element urges the auxiliary tumbler outwardly into the blocking quadrant of the housing when the correct key is not inserted into the lock. The stylus element has a recessed portion that cooperates with the auxiliary tumbler to cause the auxiliary tumbler to move radially inward when they are aligned.

When the recessed portion of the stylus element aligns with the auxiliary tumbler and as the core rotates, the cam-like surface of the housing engages and disengages the auxiliary tumbler and the abutment prevention recess. The stylus element is configured such that it fits into the keyway. The key has four parts on one of its sides, a recess in one cooperating with the stylus element to align the recessed part of the stylus element with the auxiliary tumbler.

Another cylinder lock structure is disclosed in U.S. Patent No. 4,723.427.
(Oliver). The structure disclosed in this patent includes at least one skew cut.
-cut) has a torsion tumbler operated by a knurled key with a bit. The lock is also provided with a side bar for additional locking mechanism. The side bars are arranged symmetrically in a plane passing through the center of the core and perpendicular to the plane of the keyway. The cylinder housing has a slot with a cam-like surface that receives the sidebar. When the lock is in position, the sidebar is pushed into the slot. Thus, the sidebars and slots cooperate to prevent the core of the lock from rotating.

The sidebar has a plurality of legs that extend into the keyway and rest against the outer radial surface of the tumbler when the lock is in the locking position. The sidebar is further configured such that its legs intersect the outer radial surface of the tumbler as well as the contour of the key. The tumbler has an axial slot that receives the leg of the sidebar upon rotation of the tumbler into position. A skew cant bit on the key functions to rotate the tumbler into its correct position. The key profile also has a slot extending perpendicular to its longitudinal axis.

When the correct key is inserted into the keyway, the sidebar legs align with both the tumbler slot and the key slot, thereby causing the sidebar to move radially inward. When the correct key is inserted and the core is rotated, the cam-like surface of the slot 1- of the housing is biased radially inwardly of the side bar.

Other cylindrical lock structures having separate sets of tumblers in different radial directions are disclosed in U.S. Pat. No. 4,343,166 (Hoffman) and U.S. Pat.
, No. 3,393,542 (Tarepinsev) and No. 3,181,320 (Bauer).

Although each of the lock structures described above has greater security than structures obtainable only using a common pin tumbler, each of them has unique drawbacks.

For example, if an additional tumbler were used to obtain an additional safety feature accessible through the keyway, a person attempting to break the lock could Simply use the same technique to break the additional tumbler.

In a structure in which the additional tumbler cooperates with the pin-type tumbler to move the additional tumbler to the unlocking position, and in a structure in which the additional tumbler has a cam surface for evicting them from the unlocking position, the lock can be removed. Anyone wishing to break the lock simply needs to break the pin-shaped tumbler and rotate the core to move the lock into the unlocking position.

Due to the cam-like surface of the additional tumbler, the additional tumbler
The core and housing will not lock together without the aid of a cooperating pin-type tumbler. Thus, if the cooperating pin-type tumbler is moved to the unlocking position, the additional tumbler will not prevent the core from rotating.

Structures that use sidebars have the same drawbacks. The sidebar is held in the locking position so that when the tumbler is moved to the unlocked position, the sidebar is prevented from rotating due to the cam-like surfaces of the sidebar and housing. It doesn't work.

Additionally, the impression technique is quite effective in breaking locks that use a tumbler that engages only the top edge of the key.

Therefore, in view of the above, the main object of the present invention is to:
To provide a highly secure cylinder lock that resists lock breaking.

Another object of the present invention may be to provide a high security cylinder lock that resists lock breaking by common lock breaking techniques such as pulling and impressions.

Another object of the invention is to provide a tumbler accessible through a keyway.
To provide a highly secure cylinder lock in which the lock remains in its locked state even when the cylinder is moved to an unlocked position.

Another object of the present invention is to provide a break-resistant lock that utilizes keys with multiple types of key notches.

[Means to solve the problem]

To achieve the above and other objects, according to the invention, the cylinder lock of the invention includes a cylindrical housing, rotatably mounted within the housing to define a shear line between the outer surface and the inner surface of the housing. A core, a first tumbler,
means for moving the first tumbler between a locking position and an unlocking position; a second tumbler; and means for moving the second tumbler between a locking position and an unlocking position. and means for moving between. The housing has a first hole and a second hole. The core also has a first aperture and a second aperture that align with the first and second apertures of the housing, respectively, when the lock is in the lock position. The first and second tumblers are connected to the core and the first tumbler of the housing.
and the second hole, respectively, so as to be slidable therein. When the lock is in the locking position, the first tumbler extends across the shear line and into the first hole in the core and housing. When the correct key is inserted into the keyway and the lock is placed in the unlocked position, the first tumbler is pushed completely into the core below the shear line. The second tumbler is configured such that when the lock is in the locking position, the second tumbler extends across the shear line and into the second hole in the core and housing. Upon insertion of the correct key, the second tumbler is pushed completely into the housing above the shear line. The first and second tumblers are configured to resist radial movement upon application of tensile movement between the core and the housing.

Thus, according to the invention, when a tensile movement is applied to the core or housing of the cylinder lock, this movement causes the first
and a second tumbler is locked or held across the shear line to prevent rotation of the core.

To place the lock in the unlocked position, the first tumbler is pushed radially inward completely into the core and the second tumbler is pushed radially outward completely into the housing. The first and second tumblers can thus be moved in opposite directions across the shear line. This movement in the opposite direction, together with the latching features on the surfaces of the first and second tumblers, constitutes a configuration that prevents lock-picking techniques.

In a particularly advantageous embodiment, the second hole in the housing and in the core is arranged in such a way that the second tumbler cannot be accessed directly from the keyway when the lock is in the locking position. This preferred embodiment lock provides additional security to the mechanism.

Other objects, advantages, and novel features of the invention are set forth in part in the description that follows, and in part will be apparent to those skilled in the art from consideration of the description, or may be learned by practice of the invention. The objects and advantages of the invention may be achieved by means of the combinations particularly pointed out in the claims.

〔Example〕

Referring to the drawings, and in particular to FIGS. 1 and 2, there is shown a first preferred embodiment of the cylinder lock of the present invention. The cylinder lock 10 includes a cylindrical housing 14 and a core portion 12 rotatably disposed within the housing 14.
have. The outer surface of core 12 and the inner surface of housing 14 define shear lines 20. Core 12 is a specific lock 1
It has a keyway 16 adapted to receive the correct key for 0 (described in more detail below). Housing 14 has a rim or flange portion 24;
The lower surface of this portion abuts the surface on which the lock 10 is mounted.

In later use, if the lock 10 is used, the correct key is not fully inserted into the keyway 16 and the core 12 is inserted into the housing 14.
A lock is assumed to be in position when it is not rotatable within the lock. The lock 10 is also defined as being in the open or unlocked position when the correct key is fully inserted into the keyway and the core 12 is free to rotate within the housing 14.

The illustrated embodiment of lock 10 is a conventional pin-type tumbler lock having a mechanism that includes at least one spring plug tumbler 28 and at least one cooperating change tumbler 26. have. These two portions of the tumbler are slidably received in a first hole, preferably in the form of a bore, in the core 12 and a first hole in the housing 14, preferably in the form of a bore.

When the lock 10 is in the locked position, the core and housing bores are aligned.

A biasing means, preferably a first tumbler spring 30, biases the spring plug tumbler 28 and change tumbler 26 radially inwardly. When lock 10 is in the locking position, tumbler spring 30 positions spring plug tumbler 28 and change tumbler 26 so that spring plug tumbler 28 seals across shear line 20.

The core 12 is thus prevented from rotating within the housing 14 by the spring plug tumbler 28. When the appropriate key is inserted, the notch in the key connects the change tumbler 26 and the spring plug tumbler 28 so that the splitting surface between these tumblers is located at the shear line;
This raises the core 12 to a position where rotation within the housing 14 is not hindered. As will be appreciated by those skilled in the art, the cylindrical outer surface of the tumbler 2G, 28 and the cylindrical inner surface of the bores of the core 12 and housing 14 will cause latching when tensioning movement is applied between the core 12 and the housing 14. It forms an engaging surface. That is, when tensioning movement or force is applied between core 12 and housing 14, spring plug tumbler 28 resists radial movement. Here, the radial movement is along the longitudinal axis of the pin tumbler within the bore.

Since these pin-type tumblers are known in the art, no further details of the bore or tumbler will be described here. Although a cylindrical shape of the tumbler and bore is preferred, it will be appreciated that any shape of the hole and tumbler that exhibits a latching feature is suitable.

To enhance the security features of the lock 10, the lock 10 has a second tumbler means which preferably includes a kissel tumbler 32 and a kissel tumbler 32 when the lock 10 is in the locking position. It consists of a means for moving the tumbler in such a way that it prevents rotation of the core 12 across the shear vA20.

The xel tumbler 32 has a second hole in the core, preferably in the form of a bore, and a second hole in the housing 14, preferably in the form of a bore.
accepted into the hole. When the lock 1o is in the locked position, the core 12 and the second hole of the housing 14 are aligned.

When the correct key is inserted, the means for moving the xel tumbler 12 moves the xer tumbler 32 completely within the core]2, thereby causing the core 12 to move completely within the housing 1.
Does not prevent rotation within 4.

Means are provided for biasing the xel tumbler 32 radially inwardly. A suitable biasing means comprises a second tumbler spring 36 which biases a second spring plug tumbler 34. The second spring plug tumbler 34 has an engagement surface that mates with the top surface of the xel tumbler 32. The separation surface where the Xel tumbler 32 and the spring plug tumbler 34 meet is inserted with the appropriate key and the Xel tumbler 3
2 is moved radially inward, its shape changes to the shear line 2
It is configured to match the shape of 0.

(1) When the lock 10 is in the locked position, the xer tumbler 32 is held across the shear line, and (2) When the lock 10 is in the unlocked position, it does not prevent the rotation of the core 12. Suitable means are provided for positioning the xer tumbler 32 in such a manner. A preferred configuration of the means for positioning the xel tumblers 3 and 2 is to set the correct key to key a16.
It has a side tumbler 38 which engages the recess of this correct key when inserted into the key.

As shown in dotted lines in FIG. 1, side tumbler 38 extends into keyway 16 when the correct key is not inserted into keyway 16. When the appropriate key is inserted into the keyway, the key moves the side tumblers 38 radially outwardly from the keyway and into the core 12 to a predetermined position. Side tumbler 3
8 has an inclined surface 42 which cooperates with an inclined surface at the lower end of the hookah tumbler 32 to move the hookah tumbler 32 radially outward when the side tumbler 38 is moved radially outwardly. move inward. The sloped surface 42 of the side tumbler 38 allows the
The side tumbler 38 is arranged such that the tip of the side tumbler 38 cooperates with the recess of the key so that the separation surface between the xer tumbler 32 and the second spring plug tumbler 34 is aligned with the shear line 20.
Position 3B accurately. Thus, when using the correct key, the xer tumbler 32 does not prevent the core 12 from rotating.

As will be appreciated by those skilled in the art, the particular shape and configuration of the xer tumbler 32 and side tumbler 38 will depend on the particular shape and size of the lock 10. These tumblers can be suitably cut to the desired dimensions from brass material.

In the preferred embodiment, tumbler 38 has a diameter of approximately 0.39 mm.
It has a 6 cm (0,156 inch) cylindrical shape and has an inclined surface 42 which is connected to the tumbler 38.
It has an angle of approximately '23° with respect to a plane perpendicular to the longitudinal axis of. Similarly, the Xel tumbler is approximately 0.
It is cylindrical in shape with a diameter of 156 mm.

Kisel tumbler 32 facing away from the keyway
The inclined surface of the xer tumbler has an angle of approximately 35 DEG with respect to a centerline plane passing through the longitudinal axis of the xel tumbler. The inclined surface of the xel tumbler 32 facing the keyway is approximately 25 degrees with respect to the centerline plane of the xel tumbler 32.
It has an angle of

As mentioned above, the radius of curvature of the mating surfaces of hookah tumbler 32 and spring plug tumbler 34, the radius of curvature of the mating surfaces of side tumbler 38 and spring plug tumbler 40, and the length of each of these tumblers are approximately equal to the core. 1
2 and the specific dimensions of the housing 14.

The side tumblers 38 may be oriented at an angle such that gravity causes the tumblers 38 to move inwardly into the keyway when the appropriate key is not inserted. In a more preferred embodiment, means are provided for biasing the side tumblers 38 radially inwardly. Preferably, this means includes a third tumbler spring 44 and a third driver or spring plug tumbler 40. The third spring plug tumbler 44 is connected to the third spring plug tumbler 44 of the core 12 and housing 14.
is slidably disposed in the bore. In this preferred arrangement, the third spring plug tumbler 40 is positioned across the shear line to prevent rotation of the core 12 when the correct key is not inserted into the keyway 6. The third spring plug tumbler 40 and the side tumbler 38 are configured such that upon insertion of the correct key, the separation surface between the two tumbler portions is aligned with the shear line 20 so as not to impede rotation of the core 12. . Preferably, the third spring 44 has a greater compressive force than the third spring 36.

The kissel tumbler 32 and the cooperating side tumbler 3B can be arranged at any angle such that the side tumbler 38 cooperates with a portion of the key to move the side tumbler 38 radially outward. good. Preferably, Xel tumbler 3
2 are arranged parallel to and close to the conventional tumbler parts 26.2B. A suitable angle for the bore receiving the side tumbler 38 is 75 DEG relative to a plane extending perpendicular to the axis of the xer tumbler 32.

Preferably, the conventional tumbler portions 26,28 and the xer tumbler 32 are in a plane in which the longitudinal axes of these tumblers are parallel to the plane in which the keyway 16 is located, preferably in a vertical plane. In this configuration, when the lock 10 is in the locking position, the distance from the keyway 16 to the xel tumbler 32 (
Until the bore that accepts the Xel Tumbler 32)
There is no direct axis.

As shown in FIG. 2, preferably, each lock 10 is provided with a plurality of tumblers of each type. Conventional tumblers are preferably arranged in a set of aligned bores 46 in a row. Similarly, a set of bores 4 aligned in a row
Preferably, a multi-xel tumbler 32 and a cooperating spring plug tumbler 34 are arranged at 8. Preferably, bore row 48 is parallel to bore row 46. As shown, the bores are arranged such that the bores in row 46 are spaced apart from the bores in row 48. The spacing between the individual bores of the set will, of course, depend on the particular shape and size of the tumbler being used.

In a lock having a tumbler having the dimensions of the preferred embodiment described above, the centerline-to-centerline distance between each bore of set 48 is approximately zero.
．． 635 cm (0.25 inches).

In another preferred embodiment, shown in FIG. 3, lock 110 has a master ring 118. This master ring configuration allows the lock 110 to be opened with the correct key for a particular lock 110 and the master key for several locks. In this embodiment, in addition to the tumblers described above for the FIG. .

The construction of these additional tumblers is similar to the construction of the tumbler described above. In particular, a conventional set of tumbler portions 126, 128 and a first spring 130 are used to cooperate with the bitted top portion of the key. Second set of xel tumblers 132, drive tumblers 134 and spring 1
36 is an additional set of side tumblers 138, drive tumbler 1
40 and the spring 144, the xel tumbler 13
2 is moved between the locking position and the non-locking position. Side tumbler 13B cooperates with a recess on one of the sides of the key to release master ring 118. Preferably, in this embodiment, hardened carbon m (not shown), such as one having a Rockwell hardness of 60, is disposed on the inner surface of the cylindrical master ring 118 and the housing 114. This hardened carbon steel ring provides safety against drilling.

FIG. 4 shows a preferred embodiment of a key 60 that can be used with the lock 10.110 of the present invention. This key 60 has a bitted portion, and this bitted portion has a plurality of bits 72 to 76 of different heights. The pinned portion cooperates with the conventional tumbler to move the conventional tumbler to the shear line in a manner known in the art. Further, the key 60 has a plurality of recesses arranged in its contour. These recesses are the side tumbler 38,
138 to a desired position to release the lock 10.110.

The recesses may be of various depths, such as depths ranging from 0 to 0.08 inches, and may be arranged in any suitable shape along the contour of the key 60. In the preferred embodiment, the recesses are aligned with the side of the key along a line on sections 62-70. Parts 62-70
The distance between them is, of course, determined by the size of the tumblers 38, 138. For a tumbler having the dimensions of the preferred embodiment above, approximately 0.635 cm between each section 62-70.
A distance of (0.25 inches) is suitable.

The lock of the invention thus constitutes a lock with high safety characteristics. This lock can be used in any high security area such as a school, office building or jail. The high security design of the lock has a dual tumbler concept in which the first tumbler inhibits movement of the second tumbler, which is not accessible from the keyway. Insertion of the correct key with the correct recessed notch into the lock raises the side tumbler to the key cylinder shear line and movement of the side tumbler to the shear line lowers the engaging kissel tumbler. To open the lock, one side of the tumbler must be lowered to the shear line,
Since the second tumbler must be raised to the shear line, the lock thwarts conventional pulling techniques to pry it open. In fact, in the configuration of the present invention, the pulling technique is
effectively holding some of them in position across the shear line to prevent the cylinder from rotating.

For example, if a tension tool is used to apply pressure to the key cylinder core and the pin tumbler is raised in a lock bick until all of the tumblers are raised above the shear line and held in place by the tension tool, a vertical kissel A tumbler is secured across the shear line. These vertical xel tumblers cannot be moved across the shear line because they are inaccessible. The only way to lower the xel tumbler is to release pressure from the pulling tool. However, when the pressure is released from the tool, all other conventional tumblers raised to the shear line return to their original positions, thus requiring the process to be started again.

Moreover, since the key has both types of key notches (conventional vertical key notches and dimple-type notches), it is virtually impossible to press the cylinder lock key. Combining the vertical cut and the recessed cut makes it possible for the lock to
The number of combinations will also increase considerably.

The above description of the preferred embodiments of the invention has been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to its precise form of disclosure, and obviously many modifications and variations are possible in light of the above teachings. . These embodiments best explain the principles of the invention and its practical application, so that those skilled in the art will be able to make various embodiments and modifications to suit the particular use for which the invention is intended. Selected and said to be available for use.

[Brief explanation of the drawing]

FIG. 1 is a front view of the preferred embodiment of the cylinder lock of the present invention; FIG. 2 is a top view of the cylinder lock shown in FIG. 1 taken along line 2--2; FIG. Front view of another preferred embodiment of the cylinder lock of the invention; FIG. 4 is a view of a preferred embodiment of a key having a vertical key cut and a recessed side cut for use in the cylinder lock of the invention. Director General of the Patent Office Yoshi 1) Moon Takeshi 1. Display of case: 1990 Patent Application No. 84743 2,
Title of the invention Highly secure cylinder lock 3, Relationship to the amended case Applicant name Folger Adam Company 4, Agent

Claims (24)

[Claims] (1) A cylindrical lock having a keyway for receiving a key and having a normal locking position and an open position when the correct key is inserted into the keyway; a housing; a core disposed in the housing defining a shear line between an outer surface and an inner surface of the housing, the core having a first aperture and a second aperture; a first tumbler slidably disposed; i) when the lock is in a locked position, the first tumbler extends across the shear line and into the first hole of the core and housing; and ii) when the lock is in an open position. means for positioning the first tumbler so as to push the first tumbler fully into the core below the shear line when the second tumbler is in the core and the second tumbler slidably disposed in the second aperture of the housing; i) when the lock is in the locked position, the second tumbler extends across the shear line and into the second hole of the core and housing; and ii) when the lock is in the open position, the second tumbler extends across the shear line. and means for positioning the second tumbler so as to push the second tumbler fully into the housing above the lock, the first and second tumblers being free of relative movement between the core and the housing when the lock is in the locked position. A cylinder lock characterized in that it is configured to resist radial movement. (2) the means for positioning the first tumbler includes a third tumbler slidably disposed in the third hole of the core and engaging the first tumbler at an engaging portion; When the lock is in the locked position, the first and third tumblers extend into the keyway at all times, and the first and third tumblers are configured such that: i) the third tumbler carries the second tumbler across the shear line when the lock is in the locked position; ii) insert the correct key into the keyway, the third tumbler will be removed from the keyway and the first
Cylinder lock according to claim 1, characterized in that it has a cooperating surface on the engagement portion to position the tumbler below the shear line. (3) The first and second tumblers are cylindrical tumblers, and the first and second holes of the housing and the first and second holes of the core are cylindrical bores. cylinder lock. (4) Claim (4) characterized in that the first tumbler is disposed at a position substantially perpendicular to the plane of the keyway (
1) Cylinder lock as described. (5) The first hole of the core and the housing is arranged such that the first tumbler cannot be directly accessed from the keyway when the lock is in the locked position.
) Cylinder lock as described. (6) The second tumbler cooperates with the bitted portion of the top portion of the correct key, and the third tumbler is disposed at an oblique angle from the first tumbler to place the lock in the open position. Cylinder lock according to claim 2, characterized in that it cooperates with a shaped part. (7) The cylinder lock according to claim (6), characterized in that the third tumbler cooperates with a recess in the profile of the key. (8) The cylinder lock according to claim (6), wherein the first tumbler is arranged in a plane parallel to a plane containing the axis of the second tumbler. (9) The cylinder lock according to claim (8), further comprising biasing means for positioning the third tumbler in the locking position when the correct key is not inserted. (10) In a cylinder lock having a normal locking position and an unlocked position, when in the locking position, a cylindrical housing having a first hole and a second hole; a core defining a shear line between the inner surface of the housing, the core having a first aperture and a second aperture, the first aperture of the core aligned with the first aperture of the housing; two apertures are aligned with the second aperture of the housing and include first tumbler means slidably disposed in the core and the first aperture of the housing, the first tumbler means having two tumblers engaged at their separating surfaces; a separating surface of the first tumbler means is disposed radially outwardly of the shear line such that the first portion of the first tumbler means crosses the shear line; a second tumbler means movably disposed, the second tumbler means having two tumbler means engaging at a separating surface thereof;
The separating surface of the tumbler means is connected to the first of the second tumbler means.
a surface of the first tumbler portion of the first tumbler means and the first tumbler portion of the second tumbler means is disposed radially inwardly of the shear line such that the portion crosses the shear line; A cylinder lock, characterized in that each is configured to resist radial movement upon relative displacement of the core and housing. (11) When the lock is in the unlocked position, the first and second
a separating surface of the tumbler means is aligned with the shear line, means for positioning the first tumbler means in an unlocked position when inserting the correct key into the lock; and means for positioning the first tumbler means in an unlocked position when inserting the correct key into the lock; A cylinder lock according to claim 10, further comprising means for positioning the means in an unlocked position. (12) The means for positioning the first tumbler means has a third tumbler disposed in the third hole of the core, the first tumbler means engages the third tumbler with an engaging portion, and the first tumbler means The means and the third tumbler are arranged such that i) when the lock is in the locked position, the third tumbler holds the first portion of the first tumbler means across the shear line; and ii)
A cylinder according to claim 11, characterized in that the engaging portion has a cooperating surface such that the first tumbler means is positioned in the unlocked position when the lock is in the unlocked position. Tablet. (13) Claim (11) characterized in that the first and second tumbler means are cylindrical tumblers, and the first and second holes of the housing and the first and second holes of the core are cylindrical bores. Cylinder lock as described. (14) Claim (12) characterized in that the first and second tumbler means are cylindrical tumblers, and the first and second holes of the housing and the first and second holes of the core are cylindrical bosses. Cylinder lock as described. (15) The core has a keyway, and the core and the first bore of the housing are arranged so that the first tumbler means cannot be directly accessed from the keyway when the lock is in the locked position. The cylinder lock according to claim (14). (16) The second tumbler means cooperates with the bitted portion of the top portion of the correct key, and the third tumbler is disposed at an oblique angle from the first tumbler means to locate the correct key profile in the open position of the lock. 15. A cylinder lock according to claim 14, characterized in that it cooperates with a predetermined shaped part of the cylinder lock. (17) A cylinder lock according to claim 16, characterized in that the third tumbler cooperates with a recess in the contour of the correct key. (18) The cylinder lock according to claim 12, wherein the first tumbler means is arranged in a plane parallel to the plane containing the second tumbler means. (19) A cylinder lock having a keyway for receiving a key and having a normal locking position and an open position when the correct key is inserted into the keyway, the cylinder lock having a first cylindrical bore and a second cylindrical bore. a cylindrical housing; and a core rotatably disposed within the housing to define a shear line between an outer surface and an inner surface of the housing, the core having a first cylindrical bore and a second cylindrical bore. a first cylindrical tumbler slidably disposed in the first bore of the core and the housing; i) when the lock is in the locked position, the first tumbler crosses the shear line and the first bore of the core and the housing; ii) a first tumbler extending into the bore such that when the lock is in the open position the first tumbler is pushed completely into the core below the shear line;
means for positioning the tumbler; a second cylindrical tumbler slidably disposed in the core and the second bore of the housing; i) when the lock is in the locked position, the second tumbler crosses the shear line and the core; and ii) means for positioning the second tumbler such that when the lock is in the open position, the second tumbler is pushed completely into the housing over the shear line. A cylinder lock characterized by being equipped with. (20) each of the core and the housing has a third bore, and the means for positioning the first tumbler has a third cylindrical tumbler, the third tumbler engaging the first tumbler; a third tumbler is slidably disposed in a third bore of the housing such that the third tumbler extends into the keyway at all times when the lock is in the locked position and when a correct key is inserted into the keyway; The first and third tumblers are arranged such that the third tumbler is oriented radially outwardly, and the first and third tumblers are configured such that: i) when the lock is in the locked position, the third tumbler holds the first tumbler across the shear line; ,i
Cylinder lock according to claim 19, characterized in that: i) the engaging part has a cooperating surface so that the first tumbler is pushed into the core when the correct key is inserted into the keyway. (21) The cylinder lock according to claim (20), wherein the first bore of the core and the housing are arranged so that the first tumbler cannot be directly accessed from the keyway when the lock is in the locked position. . (22) the second tumbler cooperates with the bitted surface of the top portion of the correct key, and the third tumbler is disposed at an oblique angle from the first tumbler to predetermine the profile of the correct key to place the lock in the open position; Cylinder lock according to claim 20, characterized in that it cooperates with the cylinder lock. (23) A cylinder lock according to claim 22, characterized in that the third tumbler cooperates with a recess in the contour of the correct key. (24) The cylinder lock according to claim (22), wherein the first tumbler is arranged in a plane parallel to the plane containing the second tumbler.