MXPA99007029A - Improved cylinder lock system - Google Patents

Abstract

A cylinder lock (10) is provided with a resiliently biased auxiliary locking pin (40) which projects into the keyway, the auxiliary locking pin having a first end which is shaped to define in part a flaring tenon (46), and a second end (52) which engages a locking recess (50) in the lock shell (18). The cooperating key (14) has a blade (24) with a longitudinal slot (60) shaped, in the manner of a mortise, to engage the first end of the auxiliary locking pin. The depth profile of the mortise increases from an initial tenon receiving depth at the blade tip, to a functional depth, at a point displaced from the blade tip. An aperture (68) may be provided in the base of the key blade slot for cooperation with the first end of the auxiliary locking pin to permit, at the fully inserted position of the key, relative motion between the tenon and mortise.

Description

IMPROVED LOCK INSURANCE SYSTEM BACKGROUND OF THE INVENTION FIELD OF THE INVENTION The present invention relates to improvements in security devices and, in particular, to increasing the difficulty in failing mechanical lock systems. More specifically, this invention is directed to improved lock systems and, in particular, to improved cylinder locks and the keys cooperating therewith. Accordingly, the general objects of the present invention are to provide new and improved methods and articles of such type.

DESCRIPTION OF THE PREVIOUS TECHNIQUE Mechanical locks using one or more linear arrangements of drum pins are, of course, well known in the art. The drum pins, i.e., the groups of drum pins operating together of such locks are linearly displaceable, typically radially in relation to the axis of rotation of a connector or core, in response to the insertion of a key into a keyhole provided in the core. The drum pins consist of at least one upper pin or conductor, which is deflected by springs towards the axis of rotation of the core, and a driven or lower pin which is axially aligned with the driving pin when the lock is in the closed state . The drum pins are received in cameras provided in the core and cover of the lock, the pin chambers in the core are in communication with the keyhole of the lock and the outer circumference of the core. The core drum pin receiving chambers and cover are also in axial alignment with the lock in the closed state. A key with suitable notches will produce, through communication with the lower pins in the pin chambers in the core, the displacement of the drum pin that causes an interface between the pins of each of the drum pins to match a shear line defined by the outer circumference of the core. Therefore a key with suitable notches will allow the core, with the lower pins, to rotate inside the cover. The rotation of the core, will cause, through the action of a cam or piece of tail coupled to it, the operation of a lock or other similar lock mechanism. Locks of the type described generally above are known in the art as "cylinder" locks. Examples of cylinder locks of the prior art can be seen from US patents 456,917 and / or 1, 953,535. The most common way to fail a cylinder lock is to "manufacture" an unauthorized key. It is believed to be fair to establish that it is not possible to insure against lock failures simply by designing an intricate keyhole, i.e., a keyhole having a complex profile, and / or through the use of various arrangements of drum pins. Rather, a high level of security dictates that the lock manufacturer has the ability to exercise key control being the only authorized source of blind keys that can be used as the key portion of the system. DE-A-32 25 952 discloses a cylinder lock having a housing or cover 1, a pair of pivotable cores 2 and 3, drum pins consisting of a core pin 8 and a housing pin 9, a locking pin auxiliary core 14 having a head 20 extending inside the keyhole 7, a spring 21 for deflecting the auxiliary pin 14 in the direction of the cover 1 and a groove 18 in the cover for receiving the end disposed outwardly of the auxiliary pin 14. The longitudinal axis of the end disposed outwardly of the pin 14 passes through the axis of rotation of the cores. The head 20 of the auxiliary pin 14 is engaged by means of walls of a duct-shaped channel 23 on one side of the knife of the cooperating key 12. The actuator function, that is, the push in of the auxiliary pin 14, is performed at the open end of the channel in the key blade, that is, in the tip 22 of the key. The pin 14 moves easily out of engagement with the groove 18 in the cover 1 as the key is inserted in the keyhole. Therefore, the removal of the pin 14 starts immediately with its engagement by the channel 23 and the location of the pin 14 along the length of the keyhole 7 is not variable to change the combination of the lock. In addition, the cooperation between channel 23 and pin 14 must result in the pin being completely retracted from the groove 18.

BRIEF DESCRIPTION OF THE INVENTION The present invention overcomes the disadvantages and other deficiencies briefly described above in the prior art and, in doing so, provides a new cylinder lock system. As used herein, the term "cylinder lock system" means a cylinder lock and a cooperating key. In the applicant's invention, the key is formed from a blind key having a blade with unique physical characteristics. These unique blade features cooperate with one or more auxiliary lock pins that are provided in the rotating core of the cylinder lock. A lock system according to the invention therefore includes a cylinder lock having a rotatable core carrying at least one reciprocal auxiliary lock pin. As used herein, the term "pin" is designed to describe a single member or a plurality, that is, a group, of pin segments. In the closed condition of the system, the auxiliary securing pin is deflected flexibly away from the keyhole and through the shear line of the lock so as to couple the cover, such that the coupling is typically established by the insertion of the outer end of the auxiliary pin within a chamber, that is, a cooperating hole provided in the cover. The auxiliary lock pin in this way helps to inhibit relative movement between the core and the cover. The auxiliary lock pin is reciprocal along an axis which, in a preferred embodiment, is uninterrupted, linear and generally transverse to a plane defined by the keyhole. The axis of motion of the auxiliary lock pin preferably does not traverse the axis of rotation of the core, ie, the longitudinal axis of the auxiliary lock pin moves from a line through the center of the cylinder lock. At its opposite inner end, the auxiliary lock pin is provided with a formed head that extends at all times into the keyhole from one side thereof. This formed head includes a reaction surface against which a force directed axially with respect to the auxiliary lock pin can be applied. The lock system of the invention further includes a key that is provided, on the side of the blade facing in the direction of the auxiliary lock pin, with a longitudinal groove measured and shaped to cooperate with the head portion of the lock pin. auxiliary lock. In a first region extending longitudinally from the point of the blade towards the arch, the wall (s) of the longitudinal slot which is generally complementary in shape and juxtaposed to the reaction surface of the auxiliary lock pin has a first average displacement from the side of the keyhole through which the auxiliary lock pin extends. This first average displacement is selected in such a way that the formed head portion of the auxiliary lock pin will be received loosely in the slot in the tip of the blade. The wall (s) of the slot of the key blade facing the reaction surface of the auxiliary lock pin, in a second longitudinal region displaced from the tip of the blade, has a second, larger average displacement from the side of the blade. the keyhole This second displacement is in proportion to the coupling of the head portion of the auxiliary lock pin and the application of an axial force thereto which exceeds it and is opposite to the flexible diverter. The maximum displacement of the wall (s) formed complementarily of the second longitudinal groove portion is, in a preferred embodiment, insufficient to completely remove the auxiliary lock pin from the cooperating hollow in the cover. The constraint between the slot wall (s) in the second longitudinal portion of the slot and the reaction surface of the auxiliary lock pin will cause sufficient displacement of the auxiliary lock pin to allow rotation of the core relative to the cover so that the unless it starts. In the preferred mode, however, the auxiliary lock pin will only be partially removed from the hollow of the cover by the cooperation between the second key slot portion and the reaction surface of the pin. According to this, a sufficient relative rotation between the core and the cover to operate the lock from the closed state to not closed will not yet be allowed. In the preferred embodiment, the second end of the auxiliary lock pin is formed to cooperate with a wall formed on one side of the cover recess in the form of a cam follower. Accordingly, when allowed by the partial removal of the pin, the initial rotation of the core in relation to the cover, will produce, through the camming action, an additional axial displacement of the auxiliary lock pin in a direction that will tend to make the auxiliary lock pin move completely out of engagement with the cover recess. Such additional axial movement of the auxiliary lock pin requires that the key be notched or coded in such a way that lateral movement of the head portion of the auxiliary lock pin with respect to the second portion of the longitudinal slot is possible. Such a possibility is achieved by providing the head portion of the auxiliary lock pin with an extension that normally supports the base of the longitudinal slot in the key blade. This extension is sized and shaped to be received in an opening, preferably an opening, provided at the base of the slot of the key blade in the second region thereof. When this additional coding condition is met, that is, when the head extension of the auxiliary lock pin can pass within a suitably located and additionally formed opening, the auxiliary lock pin partially removed can be lifted out of closed coupling with the cover gap subsequent to the partial removal of the auxiliary lock pin and also subsequent to the displacement of the rows of drum pins of the lock to the non-closed condition by the others, that is, the conventional notches on the knife. A key of a lock system according to the present invention must, accordingly, be provided with a properly formed longitudinal groove or groove which will coact with the head of a lock pin to apply a thrust force to the pin, this longitudinal groove must have at least two linear portions where the average displacement from one side of the keyhole of a surface provided for coupling and coacting with a reaction surface of the auxiliary lock pin is different, the blade must have an additional profile to the longitudinal groove which is in proportion to the keyhole of the lock and the blade must have notches on the surface (s) suitable for cooperating with the main drum pins of the lock. Further, in the preferred embodiment, the blade must be provided with a recess or aperture properly located and formed in that portion of the slot where the axial forces are being applied to the auxiliary lock pin. According to a preferred embodiment of the invention, the head portion of the auxiliary lock pin and the groove cooperating on the side of the key blade respectively constitute a tang and box. i BRIEF DESCRIPTION OF THE DRAWINGS The present invention can be better understood, and its numerous objects and advantages will be apparent to those skilled in the art, by reference to the appended drawings, in which like reference numerals refer to similar elements in the various figures in the drawings. Figure 1 is a side elevational view, partially cut away to reveal details, of a preferred embodiment of a lock system according to the present invention. Figure 2A is a side elevational view of a preferred embodiment of a blind key from which the key of the lock system of Figure 1 can be formed by producing the cuts defining the notches. Figure 2B is a top plan view in cross section, taken along line 2-2 of Figure 2, of the blade portion of the blind key of Figure 2A. Figure 3 is a schematic view in lateral elevation, in cross section of the lock of figure 1 without a key present in the keyhole.

Figure 4A is a view similar to Figure 3 but with an authorized key partially inserted in the keyhole. Figure 4B is a view taken along line 4-4 of Figure 4A. Figures 5A and 5B are respectively identical views to Figures 4A and 4B but with the key completely inserted in the keyhole. Figures 6A and 6B are respectively views identical to Figures 5A and 5B but with the lock core rotated in relation to the cover; and Figure 7 is an enlarged side elevational view of an auxiliary lock pin of the lock of Figures 1 and 3-6.

DESCRIPTION OF THE PREFERRED MODALITIES The described embodiment of the present invention will now be described with reference to the drawings. It should be noted that the conventional elements of the lock have been omitted from the drawing in order to facilitate the understanding of the invention and that several cross-sectional views of the lock are schematic illustrations rather than manufacturing drawings. A lock system according to the invention is generally indicated at 10 in Figure 1. The lock system consists of a cylinder lock, generally indicated at 12, and a cooperating key 14. Cylinder lock 12, as is conventional, consists of a core 16, see also Figures 3-6, which is rotatable about its longitudinal axis in and in relation to a cover 18. The cylindrical boundary, ie the interface between the core 16 and the cover 18 , defines the shear line or plane of the lock. The core 16 is provided with a keyhole 20 having a profile, i.e., a cross-sectional shape, which is unique to the lock. With reference to Figure 2A, a partially manufactured key 14, that is, a blind key, has an arc portion 22 and a blade 24 that extends longitudinally from the arc and terminates at a point. The blade 24 will be formed, that is, the initially flat side faces of the article of which the blind key of Figure 2A is formed will be ground, so that the profile of the blade 24 equals the cross-sectional shape of the keyhole 20. Accordingly, the key blade 24 can be inserted into the keyhole. As is also conventional, the cylinder lock 12 will be provided with one or more main reciprocating drum barrel arrangements, the drum pins are also sometimes referred to as groups of drum pins. In the described embodiment, the lock has a single linear arrangement of drum pins. With reference to Figure 3, each drum pin will consist of at least one upper pin or impeller 26 and a lower or driven pin 28. The pins comprising the drum pins are housed in drum pin chambers provided in the core 16. and on the cover 18. The chambers in the core and in the cover receiving a set of given drum pins will be in axial alignment when the lock is in the closed state. In the described modality, the axes of the drum pin chambers are oriented radially with respect to the axis of rotation of the core 16. The chambers of the drum pin in the core communicate with the keyhole and, as shown in FIG. 3, the lower pins 28. of each drum pin extend inside the keyhole. In the described embodiment of the invention, the drum pins are, in part, housed in an extension 30 of the cover 18, as an extension that is known in the art as a "bible". It will be understood that, in the closed condition, the drum pins are deflected in the direction of the axis of rotation of the core 16 by means of springs, which are not shown. Also in the closed position of the cylinder lock, one of the pins of each drum pin extends through the shear line, i.e., it is partially in a chamber in each of the cover and the core, and by therefore avoids the rotation of the core in relation to the cover. The rotation of the core in relation to the cover is conventionally allowed by providing notches to the key blade, i.e., surface irregularities, which engage the lower pins and cause the drum pins to be displaced such that an interface between a pair of Axially aligned pins are located on the shear line. In the described embodiment, the key notches, as can be seen in figure 1, would be in the form of flat bottom serrations provided on the edge 32 of the key blade 24. The cylinder lock 12 can have one or a plurality of drum pin arrangements, and key notches cooperating with such drum pins may be on one edge (s) and / or side faces of the key blade and / or may have various shapes and axes along of which the pins move must not be oriented radially with respect to the axis of rotation of the core. According to the present invention, as best seen from FIGS. 3-6, the cylinder lock 12 is provided with at least one auxiliary lock pin 40. The pin 40 is housed, for reciprocal movement, in a chamber of pin 42 in the core 16. The chamber 42 extends between one side of the keyhole 20 and the outer circumference of the core. The pin chamber 42 is provided with an inwardly extending edge or shoulder which functions as a seat for the first end of a diverting spring 44. The opposite end of the diverting spring 44 coact with a shoulder 45 on the pin 40 (see 7), that is to say, the spring 44 is in compression and surrounds an intermediate portion of reduced diameter of the pin 40. The spring 44 therefore deflects the pin 40 outwards, i.e. in a direction generally transverse to a defined plane by and extending through the center of the keyhole 20. The axes of the main drum pins described above, in the described embodiment, lie in this plane. In contrast to the main drum pins, the axis along which the auxiliary lock pin 40 moves does not traverse, in the described embodiment, the axis of rotation of the core 16. The auxiliary lock pin 40 is, in accordance with this, out of center with respect to a central line of the nucleus. With reference to Figure 7, which is an elongated view of the auxiliary lock pin 40, at a first or inner end, the pin includes a formed head 46. The head 46, when seen in cross section in a transverse plane the keyhole generally has the shape of a spike that widens, that is to say lengthens, in the direction of the side of the keyhole opposite that through which the pin 40 extends. Therefore, the head 46 of the auxiliary lock pin 40, from the intermediate portion of reduced diameter thereof, tapers outwards. This tapered portion, that is, frustoconical, of the head 46 defines, as described below, a first reaction surface against which an axial force is applied. The first end of the auxiliary lock pin 40, in the preferred embodiment, is further characterized by an extension 48 having a predetermined cross-sectional length, size and shape. In the described embodiment, the extension 48 is cylindrical in shape and is coaxial with the pin 40. The second, opposite end of the auxiliary lock pin 40, ie, the portion of the pin 40 disposed on the cover side of the intermediate portion. of reduced diameter, releasably attaches the cover 18. This coupling can be achieved by providing an opening 50, ie, a recess, in the inner wall of the cover 18. Referring together to FIGS. 4B, 5B, 6B and 7, the second end of the pin 40 includes a projection 52 measured and formed to engage the recess 50. The side facing outwardly of the projection 52, ie, the end of the pin 40 arranged opposite to the extension 48, defines a second pin reaction surface 54 (Figures 6A and 7). In the preferred embodiment, in the manner to be described below, the provision of the reaction surface 54 allows the auxiliary lock pin 40 to function as a cam follower. Restored, the axial movement can be imparted to the pin 40 by the application of mechanical force to the angled surface 54. With the lock in the closed state as represented by FIG. 3, the projection 52 is engaged in the recess 50 and the auxiliary lock pin 40 thereby bridges the shear line of the lock and cooperates with the main drum pins to prevent relative rotation between the core and the cover. In this state, a pair of supporting walls 80 and 82, oriented generally parallel to the axis of the pin 40 in the described manner, respectively on the projection 52 and in the recess 50, coact to prevent rotation of the core 16 with relation to the cover 18. Referring again to Figures 2A and 2B, and also with reference to Figures 4-6, the side 59 of the blade 24 of the key 14 facing the side of the keyhole through which the auxiliary lock pin 40 extends is provided with a longitudinal slot 60. The slot 60 has a shape that is generally complementary to that of the head 46 of the pin 40. Thus, extending longitudinally from the tip of the blade, the blade 24 has a slot 60 that functions as a box that receives and coactuates with the tang defined by the head 46 of the auxiliary lock pin 40. The walls of the slot of the key blade 60 operatively engaging the head of the pin 40 have an average displacement from the side of the keyhole, this displacement hereinafter being referred to as the operational slot depth. The slot 60 also has a total depth measured between the base 61 of the slot 60 and the outermost plane defined by the side 59 of the blade 24. The slot 60 has a first total depth and a first operating depth in a first linear section 62 of it extending inward from the tip of the blade. The slot 60 also includes, in the described embodiment, a ramp 64 where both its total depth and its operational depth pass from the first depth or initial to the second depth. The slot 60 additionally has at least a third linear section 66 having the second total depth and the operative one. In the preferred embodiment wherein the pin 40 has a formed head extension 48, an opening 68 is provided in the base 61 of the key blade slot in the linear portion 66. The size and shape of the opening 68 is complementary to the shape and cross-sectional measurement of the extension 48 of the head 46 of the pin 40. Figure 3 describes the described embodiment of a lock according to the present invention in the closed state, that is, without a key configured and notched. In this condition, the flexible deflection of the main drum pins causes the lower pins 28 of the main drum pins to extend into the keyhole. The head 46 of the auxiliary lock pin 40 also extends into the keyhole. In the closed state of FIG. 3, the second end of the pin 40, that is to say the projection 52, is completely engaged in the recess 50 in the wall of the cover 18. Therefore,, in the state of Figure 3, the rotation of the core 16 relative to the cover 18 is prevented by the extension, through the shear line, of a pin of each of the main drum pins and the pin of auxiliary lock 40. The head 46 of the auxiliary lock pin 40, in the preferred embodiment, normally extends within the keyhole to a position where it does not traverse the central plane of the keyhole. When an authorized key is inserted into the keyhole 20, as shown in Figures 4A and 4B, the head portion 46 of the pin 40 will be received in the first section 62 of the key blade slot 60. The first total depths and operative of the slot 60 are selected in such a way that the key slot will capture the head of the pin 40 and will initially slide relative to the auxiliary lock pin without any significant force being transferred to the pin reaction surface, i.e. spigot, for the faces facing inwardly formed complementary to the groove 60, that is to say, the box.

Re-established, the initial displacement of the box defining the walls from the side of the keyhole, in proportion to the first operative depth of the slot, is sufficient to push the pin 40 inwards. When the key blade 44 is fully inserted into the keyhole 40, that is, when the condition described in FIGS. 5A and 5B is reached, a ramp portion of the slot 60, section 64 in the described embodiment, will be coact with the head 46 of the pin 40 to push the pin 40 outwardly against the deflection of the spring 44. Reestablished, the transition of the longitudinal groove 60 from the first portion of linear operating depth to the second portion of deeper operating depth will cause an axial force is applied to a reaction surface on the head 46 of the pin 40 by the complementary surface which in part defines the slot 60. This applied axial force will result in the auxiliary lock pin 40 being at least partially removed from the recess 50. on the cover 18. In the described embodiment, the cooperation between the head portion of the auxiliary lock pin and the slot portion 64 results It will be in the partial removal of the pin 40 of the recess 50 as described in Figure 5A. In this partially retracted position, the wall 80 on the pin no longer supports the gap defining the wall 82 and the downstream edge of the cam surface 54 of the pin 40 is therefore disposed on the side of the core of the surface 82. of the side wall of the hole. Re-established, coercion between the slot in the key blade and the head of the auxiliary lock pin will impart sufficient axial movement to the pin 40, against the deflection of the spring 44, to discontinue the rotation locking cooperation between the pin 40 and the hollow 50, and, therefore, allow the rotation of the core. However, when the head 46 of the pin 40 has a protrusion formed 48, the rotation of the core 16 relative to the cover 18 to the point where the lock gathered to the core 16 could be operated will be avoided in the absence of any provision to allow the additional axial movement of the pin 40 away from the cover 18. Therefore, in the described embodiment, the partial removal of the auxiliary lock pin 40 from the coupling in the recess 50, as described in Figures 5A and 5B, does not allow the closing operation because the complete rotation of the core 16 is still prevented by interference between a cam surface 70, provided on the inner wall of the cover adjacent immediately to the wall 82 of the gap 50, and an immobilized auxiliary lock pin axially, i.e., a lock pin that can not be moved further in the axial direction within the keyhole because the pin extension 48 contacts the base 61 of the key slot 60. With reference to Figs. 6A and 6B, providing the opening 68 in the key blade, the cam surface 70 on the cover 18 can cooperate with the surface 54 on the projection 52 of the pin of the key. auxiliary lock 40 for producing an axial force urging the extension 48 on the head 46 of the pin 40 within the opening 68 in response to the torque application to the arc 22 of the key 20. In the preferred embodiment, in the non-closed state described in Figure 6, at least a portion of the head 46 of the auxiliary lock pin 40 extends through the center plane of the keyhole. In a lock according to the present invention, the surface area (s) disposed most outwardly of the second projecting end 52 of the auxiliary lock pin, ie, the cam surface 54 in the preferred embodiment, is preferably, but not necessarily, generally complementary in shape to the inside diameter of the cover 18. Furthermore, with reference to Figure 2A, the longitudinal slot 60 in the key blade is preferably continued beyond the location of the auxiliary lock pin and will preferably travel from I return to at least its initial depth. This extension of the slot 60 is with the interest of facilitating the cleaning thereof. As will be obvious to those skilled in the art, it is possible to use a plurality of auxiliary lock pins 40. Where a plurality of auxiliary lock pins are used, they could enter the keyhole from opposite sides.

Claims (15)

NOVELTY OF THE INVENTION CLAIMS

1. - A cylinder lock system consisting of a lock and keys that cooperate, has a lock that includes a cover (18), the cover defines a plurality of receiving rooms for drum pins (26,28), the cover additionally has a cylindrical inner surface defining a receiving chamber for a rotating core (16), the receiving chamber for the core has a longitudinal axis about which the core rotates, the drum-receiving cells each have an axis and extend to the inner surface of the cover, the cover is ted with a fixed orientation in the environment of use of the lock system, the core has an outer surface and the shear line for the lock of the system is defined by the interfaces between the surface Inside the cover and the outer surface of the core, the core includes a keyhole (20) extending longitudinally which has sides dis Opposite positions and defines a plane in which the longitudinal axis of the rotation core lies, this plane is located intermediate to the sides of the keyhole, the core also has a plurality of drum pin receiving chambers, the pin receiving chambers of At the core drum each have an axis and the core drum pin chambers are positioned so as to be axially alignable with the associated housing drum pin receiving chambers, the drum pin receiving chambers in the core extend between the keyhole and the outer surface of the core whereby communication can be established simultaneously between the keyhole and the drum-pin receiving chambers in the cover through the drum-pin receiving chambers in the core, the drum pins are arranged in the drum-pin receiving chambers and consist of at least one lower pin (2 8) and an impeller pin (26), the axial alignment of the core and the drum pin receiving chambers of the cover allows the reciprocal movement of the drum pins, at least one of the pins of each of the drum pins extends through the shear line so as to be partially arranged in an aligned deck drum pin receiving chamber and the core drum pin receiving chamber in the absence of a key with suitable notches in the keyhole, the pins of Drums are flexibly deflected in the direction of the core by individual springs, the key (14) includes an arc (22) and a blade (24) extending longitudinally from the arc to a blade tip, the blade is measured and shaped to be received in the keyhole (20) and has a pair of spatially displaced lateral surfaces that are at least partly substantially parallel, the lock system being characterized by: the interior cover surface (18) being provided with at least one first recess (50), the core (16) has at least one first receiving chamber (42) of auxiliary lock pin extending between a first side of the keyhole (20) and the outer surface of the core, the auxiliary lock pin receiving chamber (42) has an axis that registers with the first hollow (50) of the cover when the drum pin receiving chambers of the cover and the core is in axial alignment, an auxiliary lock pin (40) being reciprocally disposed in the auxiliary lock pin receiving chamber in the core, the auxiliary lock pin defining a linear axis and having a head portion (46) formed at a first end thereof, at least part of the head portion (46) formed on all occasions is projected into the keyhole (20) from a first side thereof, the second opposite end ( 52) of the auxiliary lock pin (40) being measured and formed to couple the first recess (50) in the inner surface of the cover, the head portion (46) of the auxiliary lock pin (40) includes a reaction surface against which a force directed axially with respect to the auxiliary lock pin can be exerted, the reaction surface generally facing the second end of the auxiliary lock pin, the auxiliary lock pin (40) being flexibly diverted away from the keyhole and towards the interior surface of the cover by a spring (44) whereby the second end (52) of the auxiliary lock pin is It will extend through the shear line and into the first cover recess (50) to prevent rotation of the core relative to the cover in the absence of the application of a force to the reaction surface of the head portion of the pin. of auxiliary lock which is in a direction opposite to and in excess of the flexible deflecting force of the spring (44) of the auxiliary lock pin, at least one of the side surfaces (59) of the key (14) being provided with a longitudinal slot (60) extending from the tip of the key blade towards the arch, the longitudinal slot (60) has a shape that is at least part complementary to the shape of the reaction surface of the head portion of the auxiliary lock pin; the longitudinal groove (60) is also sized to loosely couple the head portion of the auxiliary lock pin in the tip of the blade, the groove having a substantially constant depth in a first linear section (62) thereof extending from the tip of the key blade (24) towards the arc (22) and having a second substantially constant depth in another section (66) of the slot (60) moving from the blade tip, the slot section ( 66) of the second depth being in register with the auxiliary lock pin (40) when the key blade (24) is fully inserted in the keyhole (20), the depth of the slot (60) transitioning uniformly from the depth of the first section (62) at the depth of the second section (66) in a region (64) that is moved from the tip of the blade by the length of the first section (62), the insertion of the key blade den of the keyhole with the lock pin head engaged in the groove (60) beyond the point where the groove initiates the transition to the second depth resulting in the part formed complementarily of the groove generating and applying an axial force to the The reaction surface of the auxiliary lock pin head which is of sufficient magnitude to overcome the flexible deflection of the auxiliary lock pin spring.

2. The cylinder lock system according to claim 1 further characterized in that the longitudinal groove (60) in part defines a box that is generally complementary in shape to the reaction surface on the head (46) of the lock pin auxiliary (40), the cooperation, between the reaction surface and the case causes the displacement of the auxiliary lock pin when said head is disposed in the groove section (66) of the second depth.

3. The cylinder lock system according to claims 1 d 2 further characterized in that the linear axis of the auxiliary lock pin (40) is oriented generally transversely with respect to the defined plane of the keyhole (20) and ei The axle of the auxiliary lock pin passes through said plane at a point offset from the longitudinal axis of rotation of the core.

4. The cylinder lock system according to claims 1, 2, or 3 further characterized in that the second end (52) of the auxiliary lock pin (40) has at least in part a shape that is generally complementary to the shape of the first hollow (50) in the cover (18), and wherein the first hollow of the cover and the second end of the auxiliary lock pin are respectively provided with wall surfaces (80, 82) that coactuan to prevent rotation of the core (16) in relation to the cover (18) when the second end of the auxiliary lock pin is completely engaged in the first recess of the cover.

5. The cylinder lock system according to claims 1-4 further characterized in that the second end (52) of the auxiliary lock pin (40) terminates on a face (54) which, in the direction of rotation of the The core is displaced from the defined plane of the keyhole by a greater distance on a first side of the axle of the auxiliary lock pin than on a second side of the axle of the auxiliary lock pin.

6. The cylinder lock system according to claims 1-5 further characterized in that the second end (52) of the auxiliary lock pin (40) consists of a cam surface (54) and the first recess (50) in the cover (18) includes a cam surface (70) generally complementary in shape to said cam surface, the cam surface of the cover extends outwardly from the cylindrical interior surface of the cover, the first recess (50). ) of the cover and the second end (52) of the auxiliary lock pin being respectively provided with rotation preventing walls (80)., 82) that abut when the second end of the auxiliary lock pin is fully engaged in the first recess of the cover, the auxiliary lock pin and the rotation prevention walls (80 and 82) of the first cover recess coactuan for preventing rotation of the core (16) relative to the cover (18) when the second end (52) of the auxiliary lock pin is fully engaged in the first recess (50) of the cover, the cover cam surface (70) ) and the cam surface (54) of the auxiliary lock pin cooperate to impart axial movement to the auxiliary lock pin in response to relative rotation between the cover and the core subsequent to the interruption of the coercion between the rotation prevention walls. (80, 82) which has resulted from the axial movement of the auxiliary lock pin (40) in response to the head portion of the lock pin (46) being placed in the groove section. ra (66) of the second depth in the Have blade (24).

7. The cylinder lock system according to claims 1-6 further characterized in that the auxiliary lock pin (40) additionally comprises an extension (48) of the head portion (46), said extension being generally projected to the second side of the keyhole and being juxtaposed to the base (61) of the key blade slot (60) to thereby limit axial movement of the auxiliary lock pin, and where the key blade (24) further includes an opening (68) in the slot section (66) of the second depth, said opening extending from the base (61) of the slot through an opposite side of the blade, the size and relative shape of the opening (68) and the extension (48) of the head portion of the auxiliary lock pin allow said extension to be received in the opening whereby the extension does not limit the axial movement of the auxiliary lock pin. 8.- The lock system in accordance with the claim 7 further characterized in that the opening (68) and extension (48) of the head portion of the auxiliary lock pin are complementary in shape. 9. The lock system according to claims 1-8 further characterized in that the reaction surface of the portion (46) of the head of the auxiliary lock pin partially defines a pin that widens. 10. A cylinder lock consisting of a cover (18) having a cylindrical interior surface defining a receiving chamber for a rotating core (16), the receiving chamber for the core has a longitudinal axis around which the core rotates , the cover also defines a plurality of drum pin receiving chambers (26,28), the drum pin receiving chambers each have an axis and extend to the inner surface of the cover, the cover is mounted with an orientation fixed in the environment of use of the lock, the core has an outer surface and the shear line for the lock is defined by the interface between the inner surface of the cover and the outer surface of the core, the core includes a keyhole ( 20) that extends longitudinally which has sides arranged opposite and defines a plane in which the longitudinal axis of rotation of the core lies, this plane is located in the middle of the sides of the keyhole, the core also has a plurality of drum pin receiving chambers, the drum pin receiving chambers in the core each have an axis and the core drum pin chambers are positioned to be axially alignable with the associated drum pin receiving chambers of the casing, the drum pin receiving chambers in the core extend between the keyhole and the outer surface of the core whereby communication can be established simultaneously between the keyhole and the receiving chambers of the drum pin in the cover through the drum-pin receiving chambers in the core, the drum pins are disposed in the drum-pin receiving chambers and consist of at least one lower pin ( 28) and a drive pin (26), the axial alignment of the core and the pin receiving chambers of drum cover allows reciprocal movement of the drum pins, at least one of the pins of each of the drum pins extends through the shear line as to be partially arranged in a drum-pin receiving chamber of the cover and an axially aligned core drum pin receiving chamber in the absence of a key with suitable notches in the keyhole, the drum pins are flexibly diverted in the direction of the core by individual springs, the lock being characterized by: the surface Inside the cover (18) being provided with at least one first recess (50), the core (16) has at least a first receiving chamber (42) of auxiliary lock pin that extends between a first side of the keyhole ( 20) and the outer surface of the core, the receiving chamber (42) of the auxiliary lock pin has a linear axis that registers with the first recess (50). ) of the cover when the housing and core drum receiving chambers are in axial alignment, an auxiliary lock pin (40) being reciprocally disposed in the auxiliary lock pin receiving chamber (42) of the core, the Auxiliary lock pin has a uninterrupted linear axis and has a head portion formed (46) at a first end thereof, at least part of the formed head portion (46) on all occasions projects within the keyhole ( 20) from a first end thereof, the second opposite end (52) of the auxiliary lock pin (40) being measured and formed to engage the first hole in the inner surface of the cover, the head portion (46) of the auxiliary lock pin (40) includes a reaction surface against which a force directed axially with respect to the auxiliary lock pin can be exerted, the reaction surface generally facing the second end of the auxiliary lock pin, the auxiliary lock pin (40) being flexibly diverted away from the keyhole and towards the interior surface of the cover by a spring (44) whereby the second end (52) of the auxiliary lock pin (40) ) will extend through the shear line and into the first gap (50) of the cover to prevent rotation of the core relative to the cover in the absence of the application of a force to the reaction surface of the head portion of the auxiliary lock pin which is in a direction opposite to and in excess of the flexible deflecting force of the spring (44) of the auxiliary lock pin, the second end (52) of the auxiliary lock pin terminates on a face (54) which is generally directed away from the keyhole (20), the linear axis of the auxiliary lock pin lies on a second piano which is substantially transverse to the plane defined from the keyhole when the drum-receiving cells of the cover and the core are in axial alignment, the face (54) of the second end of the lock pin traverses the axis of the auxiliary lock pin at an angle so that the face is displaced from the defined plane of the keyhole by a greater distance on a first side of the second plane than on the second opposite side of the second plane. 11. The cylinder lock according to claim 10, further characterized in that the first recess (50) of the cover and the second end (52) of the lock pin are respectively provided with rotation prevention walls (82, 80). , said rotation preventing walls (80, 82) being in supporting relationship and being oriented generally parallel to the axis of the auxiliary lock pin when the auxiliary lock pin (40) is caused to completely engage the first recess (50) of cover by means of the spring (44) of the auxiliary lock pin, the length of said wall (82) of prevention of rotation of the first cover gap being less than the average depth of the first cover gap measured from the cylinder defined by the inner surface of cover, the walls (80, 82) of prevention of rotation supporting coactán to avoid the rotation of the core (16) in relation to the cover (18) when the second end of the auxiliary lock pin is completely engaged in the first cover recess. 12. The cylinder lock according to claim 10 or 11, further characterized in that the head portion (46) of the auxiliary lock pin (40) partially defines a tang that is stretched. 13. The cylinder lock according to claims 10-12 further characterized in that the first cover recess (50) is defined in part by a cam surface (70) and wherein the face (54) at the second end (52) of the auxiliary lock pin (40) defines a follower cam surface (54), said cover cam surface is combined with and extends outward from the cylindrical interior surface of the cover, the cover cam surface (70) and the follower surface (54) of the auxiliary lock pin cam cooperate to impart axial movement to the auxiliary lock pin (40) in response to relative rotation between the cover and the core. 14.- The cylinder lock in accordance with the claim 13 further characterized in that the cover cam surface (70) and the rotation prevention wall (82) of the first cover recess (50) cooperate to define a side of the first cover recess and wherein the surface (54) follows The cam of the auxiliary lock pin extends angularly from the rotation prevention wall (82) of the auxiliary lock pin (40). The cylinder lock according to claims 10-14 further characterized in that the auxiliary lock pin (40) additionally comprises an extension (48) of the head portion (46), said extension being generally projected towards the second side of the keyhole. 16, - A blind key for use with a cylinder lock having a keyhole (20) defining a plane, the keyhole having a pair of opposite sides, the lock having at least a first auxiliary lock pin (40) deflected flexibly , the auxiliary lock pin (40) has a linear axis and is reciprocal along said axis, the lock pin (40) also has a formed head portion (46) that extends into the keyhole (20) of the lock from a first side of the keyhole, the formed head portion (46) being at a first end of the auxiliary lock pin (40) and includes a reaction surface generally facing the first side of the keyhole, the key blind has a bow (22) and a blade (24) that extends longitudinally from the arch and ends in a tip, the blade has a first side (59) and a second side displaced spatially, said blade also has a pair of edges space two and arranged in opposite manner that interconnect the blade sides, the first and second sides of the blade (24) being at least partly substantially parallel to each other, said blind key is characterized by: a slot (60) extending longitudinally along at least the first side (59) of the blade (24) from the tip of the blade in the direction of the arc (22), the slot (60) at least in part defines a box that is complementary in Forming at least a portion of the reaction surface of the formed head (46) of the auxiliary lock pin (40), the shape of the complementary slot includes a reaction surface that faces generally in the direction of the second side of the blade. (24), the slot (60) has a first linear section (62) with a first depth to receive the head portion (46) of the auxiliary lock pin (40), the depth of the section of the first slot (62). ) being generally in pr the axial distance of the auxiliary lock pin (40) extending within the keyhole (20) of the lock so that the head portion of the auxiliary lock pin can be loosely coupled in the first linear section (62) of the slot (60), the first linear section of the slot extends from the tip of the blade and smoothly transits within a second section of linear slot (66) having a second depth exceeding the first depth, said second one linear groove section (66) being moved from the tip of the blade, the blade (24) being movable relative to the auxiliary lock pin (40) with the pin head portion (46) disposed in the first slot section (62) without imposing force on the reaction surface of the auxiliary lock pin until the depth of the slot (60) begins the transition from the first depth to the second depth in a third slot section (64) displaced from the tip of the blade by the length of the first linear slot section (62). 17. The blind key according to claim 16 further characterized in that the depth of the first linear section (62) of the groove (60) is less than one half the thickness of the blade (24) and the depth of the second Linear groove section (66) exceeds one half the thickness of the blade. 1

8. The blind key according to claim 16 or 17, further characterized in that it additionally comprises: an opening (68) in the base (61) of the slot (60), the opening being located in the second depth of the linear groove section (66) and extends from the base (61) of the slot through the second of the sides of the blade. 1

9. The blind key according to claim 18, further characterized in that the opening (68) is measured to receive a formed extension (48) of the head portion (46) of an auxiliary lock pin (40). 20. The blind key according to claims 18 you 19, further characterized in that the cross-sectional shape of the opening (68) partly defines the notches of the key to be formed from said blind key.