TWI693328B - Rekeyable lock cylinder with enhanced torque resistance - Google Patents

Abstract

A rekeyable lock cylinder with a cylinder body and a plug assembly. The lock cylinder includes a plurality of key followers and a corresponding plurality of racks disposed in the plug assembly. The lock cylinder includes means for blocking rotation of the plug assembly with respect to the cylinder body to prevent unlocking of the rekeyable lock cylinder with an unauthorized object. In some embodiments, the blocking means is configured such that torqueing the plug assembly with an unauthorized object applies force to the blocking means without translating such force to the plurality of racks. This type of arrangement enhances torque resistance of the lock cylinder against attempted forced entry.

Description

Lock core with replaceable key with enhanced torque resistance [Related application]

This application claims the rights of US Provisional Patent Application No. 62/180,339 filed on June 16, 2015, the entire contents of which are incorporated herein by reference.

The present invention relates generally to locks; in particular, the present invention relates to locks having a replaceable key lock core with enhanced torque resistance.

It is known that the lock core of the key can be replaced without removing the lock cylinder. For example, US Patent No. 8,033,150 describes a replaceable key cylinder. These types of locks are extremely beneficial to consumers because they can easily replace the key without using a locksmith.

Although the lock cylinder lock cylinder should rotate freely when an authorized key is inserted into the lock slot, the lock cylinder should be structurally designed to resist rotation of the lock cylinder when torque is applied by an unauthorized key (or other object). A large amount of torque resistance for the lock core is the key to reducing forced entry. Therefore, there is a need for a replaceable key lock with enhanced torque resistance.

According to one aspect, the present invention provides a replaceable key lock core having a lock core body and a lock post assembly. The lock body defines a longitudinal axis and includes a groove. The lock cylinder assembly is disposed in the lock cylinder main body and can rotate around the longitudinal axis. The lock core contains a plurality of keys The follower and the corresponding racks arranged in the lock cylinder assembly. In response to the application of a force inserted into the core of the replaceable key to promote the replacement of the key to a new key, at least one of the plurality of racks is selectively from at least one of the plurality of key followers One is free. The lock cylinder includes a member for blocking the rotation of the lock cylinder assembly relative to the lock cylinder body to prevent unlocking of the replaceable key cylinder using an unauthorized object. In some embodiments, the blocking member is structurally designed such that an unauthorized object is used to twist the lock cylinder assembly to apply a force to the blocking member without converting the force to the plurality of racks. This type of configuration enhances the torque resistance of the lock core.

In some embodiments, the blocking member includes a locking lever that can move laterally relative to the longitudinal axis to a locking position of the groove of the lock body and the groove from the lock body One between unlocked positions. For example, the locking lever may include a surface that engages a surface of the groove when the locking lever is in the locked position. In some illustrative embodiments, the respective surfaces of the lock lever and the groove that are engaged when the lock lever is in the locked position are in approximately parallel planes. Depending on the environment, the surface of the lock lever that engages the groove in the lock body when the lock lever is in the locked position is not an inclined surface. For example, the surfaces may be flat relative to each other. In some cases, the edge of the locking bar is substantially square, such as having an approximately rectangular cross-section.

In some embodiments, there are one or more biasing members urging the locking lever toward the plurality of racks. With this configuration, when an authorized key is inserted into the lock slot, the biasing members push the lock lever out of the groove in the lock body. In some illustrative embodiments, a spring force of the biasing member is less than a spring force of the spring-loaded key followers. Thus, the spring-loaded key followers will overcome the spring force of the biasing member to lock the lock core when a key is not inserted into the lock slot.

After considering the following detailed description of the best mode for carrying out the invention as previously perceived, those skilled in the art will appreciate additional features and advantages of the invention.

10‧‧‧lock heart

12‧‧‧Longitudinal axis

14‧‧‧Lock body

16‧‧‧Lock column assembly

18‧‧‧ retainer fixture

20‧‧‧Roughly cylindrical body

22‧‧‧Front end

24‧‧‧back

26‧‧‧Cylinder wall

28‧‧‧Inner surface

30‧‧‧ Internal locking lever engagement groove

32‧‧‧Lock body

34‧‧‧ carrier sub-assembly

36‧‧‧Lock cylinder

38‧‧‧Spring loaded pin

40‧‧‧ middle part

42‧‧‧Drive part

44‧‧‧lock slot opening

46‧‧‧Replace the key tool opening

48‧‧‧channel

50‧‧‧Anti-Drilling Ball Bearing

51‧‧‧Torque blade

52‧‧‧Slot

54‧‧‧Central groove

56‧‧‧Main part

58‧‧‧channel

60‧‧‧flat surface

62‧‧‧recess

64‧‧‧Retaining cover

66‧‧‧flat surface

68‧‧‧ Bullet rack engagement features

70‧‧‧Carrier

72‧‧‧Rack

73‧‧‧Spring snap lock

74‧‧‧Lock lever

76‧‧‧Fixture

78‧‧‧bias parts

80‧‧‧Return spring

82‧‧‧Main

84‧‧‧Curved surface

86‧‧‧flat surface

88‧‧‧Lock lever slot

90‧‧‧Spring lock recess

92‧‧‧ Bias component receiving hole

94‧‧‧Parallel rack receiving slot

96‧‧‧Concave area

98‧‧‧block

100‧‧‧Jig receiving recess

102‧‧‧Flange

104‧‧‧Lock lever engagement groove

106‧‧‧Receiving part

108‧‧‧ authorized key

110‧‧‧Unauthorized key

112‧‧‧flat surface

114‧‧‧flat inner surface

In the following, the invention will be described with reference to the accompanying drawings, which are only given as non-limiting examples, wherein: FIG. 1 is a perspective view of an example lock core according to an embodiment of the invention; 2 is an exploded view of the example lock cylinder shown in FIG. 1; FIG. 3 is a cross-sectional view of the example lock cylinder shown in FIG. 1, showing the spring pushing the locking rod toward the rack; FIG. 4 is FIG. 1 A cross-sectional view of the example lock core shown, which shows the interface between the lock lever and the main body of the lock core using an authorized key in the lock slot; FIG. 5 is a cross section of the example lock core shown in FIG. 1 Figure, which shows the interface between using an unauthorized key in the lock slot between the lock rod and the lock body; Figure 6 is a cross-sectional view of the example lock core shown in FIG. There is no interface between the lock body and a key in the lock slot.

Throughout several views, corresponding element symbols refer to corresponding parts. The example set forth herein illustrates one embodiment of the invention in one form, and this example should not be construed as limiting the scope of the invention in any way.

The invention relates to a replaceable key cylinder, which can be replaced without removing the lock cylinder. The operation for replacing the key with the key is similar to the operation described in US Patent No. 8,033,150, which is incorporated herein by reference. Although the key replacement operation operates similarly, the lock core includes an enhanced torque resistance. In some embodiments, this enhanced torque resistance is structured in a manner that isolates the torque on the lock cylinder from the racks, which improves the durability of the lock cylinder.

According to an embodiment of the invention, a pictorial lock core 10 is shown in FIGS. 1 and 2. The lock core 10 includes a longitudinal shaft 12, a lock core body 14 and a lock cylinder assembly 16. A retainer clamp 18 (FIG. 2) couples the lock body 14 and the lock cylinder assembly 16 together.

The lock body 14 (as best seen in FIG. 2) illustratively includes a substantially cylindrical main body The body 20 has a front end 22, a rear end 24 and a cylindrical wall 26 defining an inner surface 28. The cylindrical wall 26 includes an internal locking rod engagement groove 30 (best seen in FIGS. 4, 5, and 6). In some embodiments, the locking lever engagement groove 30 has a generally rectangular cross-section and extends longitudinally along a portion of the lock body 14 (typically from the front end 22).

The lock cylinder assembly 16 includes a lock cylinder body 32, a carrier sub-assembly 34, and a plurality of spring-loaded pins 38 (also referred to as key followers). The lock cylinder body 32 illustratively includes a lock cylinder surface 36, a middle portion 40 and a driving portion 42. The lock cylinder surface 36 defines a lock slot opening 44, a key replacement tool opening 46, and a pair of channels 48 extending radially outward for receiving the anti-drill ball bearing 50. The driving portion 42 is structurally designed to drive a torque blade 51, which may be coupled with a latch assembly (not shown). The driving portion 42 further includes a pair of slots 52 and a central groove 54 formed in the periphery thereof for receiving the holder jig 18 to hold the lock cylinder body 32 in the lock cylinder body 14.

The middle portion 40 includes a main portion 56 which is formed as a cylindrical section and has a plurality of channels 58 for receiving spring-loaded pins 38. The channel 58 illustratively extends transverse to the longitudinal axis of the lock cylinder body 32. A flat surface 60 defines a recess 62 for receiving a retaining cover 64. The channels 58 partially extend through the locking post body 32, wherein the side walls of the channels are open to a flat surface 66. The flat surface 66 illustratively includes a plurality of bullet-like rack engaging features 68.

The carrier sub-assembly 34 includes a carrier 70, a plurality of racks 72, a spring lock 73, a locking lever 74, for holding the corresponding biasing member 78 against the locking lever 74 to push the locking lever 74 against the rack One pair of 72 is a clamp 76 and a return spring 80. The carrier 70 includes a main body 82 in the form of a cylindrical section, which is complementary to the main portion 56 of the lock cylinder body 32 such that the carrier 70 and the main portion 56 combine to form a lock core that fits within the lock core body 14 . The carrier 70 includes a curved surface 84 and a flat surface 86. The curved surface 84 includes a locking lever slot 88, a spring locking recess 90, and a pair of jig receiving recesses 100 for receiving the jig 76. The lock lever slot 88 illustratively contains a pair of biasing member receiving holes 92 for receiving a biasing member 78. In the illustrated embodiment, the locking lever 74 includes a corresponding pair of recessed areas 96 for receiving one of the biasing members 78.

The spring-loaded locking lever 74 is sized and structurally designed to fit in the locking lever slot 88 in the carrier 70. The lock lever 74 illustratively includes a blocking portion 98 which is received in the lock lever engagement groove 30 in the lock body 14 when in the locked position (FIGS. 5 and 6) and when in an unlocked position ( In Fig. 4), the locking lever engaging groove 30 extends. In some embodiments, as shown schematically, the blocking portion 98 has a square edge forming a rectangular cross-section. This square surface stands with respect to the triangular shaped edge of the lock lever described in US Patent No. 8,033,150 (which is moved out of the groove in the body of the lock core by a cam action). By using the pushing of the biasing member 78 to move the blocking portion 98 out of the groove 30 in the core body 14, a square edge can be used with a corresponding flat surface in one of the locking lever engagement grooves 30, thereby comparing with One of the triangular shaped edges and corresponding triangular shaped locking rod engaging grooves described in US Patent No. 8,033,150 increases the torque resistance of the lock core 10. Moreover, this releases the stress on the rack 72, because the torque applied by an unauthorized key (or other object) will not be converted from the lock lever 74 to the rack 72 without a cam action; instead, the lock lever 74 and The locking lever engagement groove 30 will isolate the torque from the rack 72. Relative to the square edge of the blocking portion 98, the locking bar 74 includes a flange 102 that is structurally designed to engage the locking bar engagement groove 104 formed in the rack 72 (FIGS. 4, 5, and 6). The flat surface 86 of the carrier 70 includes a plurality of parallel rack receiving slots 94 extending perpendicular to the longitudinal axis of the carrier 70.

FIG. 3 is a schematic cross-sectional view of one of the lock cores 10 of one of the clamps 76 cut laterally. In this view, it can be seen that the clamp 76 extends around the carrier 70. One end of the biasing member 78 is fixed against one of the receiving portions 106 of the clamp 76 and the other end is received in the concave area 96 of the locking lever 74 and pushes the locking lever 74 against the rack 72. In this embodiment, the lock lever 74 is continuously pushed against the rack 72 by the biasing member 78.

4, 5 and 6 are schematic cross-sectional views of the lock core 10 cut laterally along the blocking portion 98 of the lock lever 74. In FIG. 4, it shows an authorized key 108 inserted into the lock slot In the port 44, the key cut of the authorized key 108 is such that the spring-loaded pin 38 is moved and thereby the rack 72 is moved to where the flange 102 of the lock lever 74 is received by the rack 72 by the pushing of the biasing member 78 Each of the locking levers engages a position in the groove 104. The blocking portion 98 of this positioning lock lever 74 is moved to its unlocking position out of the lock lever engagement groove 30, thereby allowing the lock cylinder assembly 16 to freely rotate relative to the lock body 14 to unlock the lock core 10. The biasing member 78 causes the locking lever 74 to push out of the locking lever engagement groove 30. This position stands relative to the cam action described in US Patent No. 8,033,150 for moving the locking lever out of one of the grooves in the lock body. FIG. 5 shows an example in which an unauthorized key 110 is inserted into the lock slot opening 44. Since the key cut of the unauthorized key 110 is “unauthorized”, the lock lever engagement groove 104 of at least one of the rack 72 is not aligned with the flange 102 of the lock lever 74. Therefore, the lock lever 104 cannot be pushed out of the lock lever engagement groove 30 of the lock body 14, which means that the blocking portion 98 prevents the rotation of the lock cylinder assembly 16 relative to the lock body 14. In the illustrated embodiment, the edge of the blocking portion 98 is square and the locking lever engagement groove 30 of the key body 14 has a corresponding shape. This means that the force caused by the torsion lock cylinder assembly 16 relative to the lock body 14 will be applied to the flat surface 112 of the blocking portion 98 relative to a flat inner surface 114 of the lock lever engagement groove 30. Since the surfaces 112, 114 are flat relative to each other, this enhances the torque resistance compared to an inclined surface (such as the triangular edge of the lock lever of U.S. Patent No. 8,033,150 and the corresponding triangular groove in the lock body) Sex. Moreover, unlike flat surfaces 112, 114, the inclined surfaces described in US Patent No. 8,033,150 produce a cam action that applies force to the rack, which in some cases can deform the rack or in other cases Reduce the durability of the rack. FIG. 6 shows an example in which there is no key in the lock core 10. The spring of the spring load pin 38 has a spring force higher than the biasing member 78. Accordingly, when there is no key in the lock slot, the spring load pin 38 drives the rack 72 downward, overcoming the force of the biasing member 78, so that the flange 102 of the lock lever 74 is not received by the rack 74 The locking lever engages in the groove 104. This forces the blocking portion 98 of the lock lever 74 into the lock lever engagement groove 30 of the lock body 14, which prevents the lock cylinder assembly 16 from opposing For the rotation of the lock body 14.

Examples

The following provides illustrative examples of replaceable key cylinders disclosed herein. An embodiment of the replaceable key lock core may include any one or more and any combination of the examples described below.

Example 1 is a replaceable key cylinder with a core body, the core body has a longitudinal axis and includes a groove. The lock core includes a lock post assembly disposed in the body of the lock core, which is rotatable about the longitudinal axis. A plurality of lock key followers and a corresponding plurality of racks are arranged in the lock cylinder assembly. In response to the application of a force inserted into the core of the replaceable key to promote the replacement of the key to a new key, at least one of the plurality of racks is selectively from at least one of the plurality of key followers One is free. The lock cylinder includes a member for blocking the rotation of the lock cylinder assembly relative to the lock cylinder body to prevent unlocking of the replaceable key cylinder using an unauthorized object. The blocking member is structurally designed such that the force from using an unauthorized object to twist the lock cylinder assembly is mainly distributed between the lock body and the blocking member compared to any force converted to the plurality of racks In this way, the torque resistance of the replaceable key lock core is enhanced.

In Example 2, the subject matter of Example 1 is further structured so that the blocking member includes at least one locking lever, which can move laterally relative to the longitudinal axis to a locking position of the groove of the lock body and Between one of the grooves of the lock body and the unlocking position.

In Example 3, the subject matter of Example 2 is further structurally designed such that the at least one locking lever includes a surface that engages a surface of the groove when the at least one locking lever is in the locked position. The respective surfaces of the at least one locking lever and the groove engaged when the at least one locking lever is in the locked position are in approximately parallel planes.

In Example 4, the subject matter of Example 3 is further structurally designed such that when the at least one locking lever is in the locked position, the at least one lock engaging the groove in the lock body The surface of the fixed rod is not an inclined surface.

In Example 5, the subject matter of Example 3 is further structurally designed such that when the at least one locking lever is in the locked position, the surface of the at least one locking lever that engages the groove in the core body is flat surface.

In Example 6, the subject matter of Example 3 is further structurally designed such that the surface of the at least one locking rod that engages the groove in the lock body is approximately parallel to a plane radially parallel to an axis of the longitudinal axis in.

In Example 7, the subject matter of Example 2 is further structurally designed such that when the at least one locking lever is in the locked position, an edge of the at least one locking lever is received in the groove of the lock body.

In Example 8, the subject matter of Example 7 is further structured so that the edge of the at least one locking bar is substantially square.

In Example 9, the subject matter of Example 7 is further structured so that the edge of the at least one locking lever has an approximately rectangular cross-section.

In Example 10, the subject matter of Example 1 is further structured to include a biasing member that urges the blocking member toward one of the plurality of racks.

In Example 11, the subject matter of Example 10 is further structured so that the plurality of key followers are spring loaded, and wherein a spring force of the biasing member and a spring force of the spring loaded key followers Proportional to ensure that any key follower will not be raised by the at least one locking lever.

Example 12 is a replaceable key cylinder, which includes a core body, which has a longitudinal axis and includes a groove. The lock core includes a lock post assembly, which is disposed in the body of the lock core and is rotatable about the longitudinal axis. A carrier assembly is provided, which includes a plurality of racks and at least one locking lever. The lock core includes a plurality of key followers, which are arranged in the lock cylinder assembly. In response to the application of a force inserted into the core of the replaceable key from an object to facilitate replacement of the key to a new key, at least one of the plurality of racks is selectively removed from the plurality of locks At least one of the key followers is detached. The at least one locking lever can move transversely to the longitudinal axis and rotatably about the longitudinal axis. At least a portion of the at least one locking lever is movable between a locked position in the groove of the lock body and an unlocked position out of the groove in the lock body. The at least one locking lever is structurally designed to prevent the replaceable key lock core from being unlocked by an unauthorized object. The at least one locking lever is structurally designed so that the force from using an unauthorized object to twist the lock cylinder assembly is mainly distributed in the lock cylinder body and the carrier assembly compared to any force converted into the plurality of racks Into between.

In Example 13, the subject matter of Example 12 is further structured so that a biasing member pushes the at least one locking lever toward the plurality of racks.

In Example 14, the subject matter of Example 12 is further structured so that the plurality of key followers are spring loaded, and a spring force of one of the biasing members is less than the spring force of one of the spring loaded key followers.

Example 15 is a replaceable key cylinder, which includes a core body, the core body has a longitudinal axis, including a groove. A lock cylinder assembly is arranged in the lock core body and can rotate around the longitudinal axis. The lock core includes a plurality of lock key followers and a corresponding plurality of racks, which are arranged in the lock cylinder assembly. In response to the application of a force inserted into the core of the replaceable key to promote the replacement of the key to a new key, at least one of the plurality of racks is selectively from at least one of the plurality of key followers One is free. At least one locking lever can move transversely to the longitudinal axis and rotatably about the longitudinal axis. At least a portion of the at least one locking lever is movable between a locked position in the groove of the lock body and an unlocked position out of the groove in the lock body. The portion of the at least one locking lever received in the groove has an approximately rectangular cross-section. The lock core includes a biasing member that pushes the at least one locking rod toward the plurality of racks.

In Example 16, the subject matter of Example 15 is further structured so that the plurality of key followers are spring loaded and one of the biasing members has a spring force less than one of the spring loaded key followers.

Although the present invention has been described from the foregoing description with reference to specific components, materials, and embodiments, those skilled in the art can easily confirm that the basic characteristics and various changes of the present invention can be made without departing from the spirit and scope of the present invention And modified to adapt to various uses and characteristics.

10‧‧‧lock heart

12‧‧‧Longitudinal axis

14‧‧‧Lock body

16‧‧‧Lock column assembly

36‧‧‧Lock cylinder

44‧‧‧lock slot opening

46‧‧‧Replace the key tool opening

Claims (13)

A replaceable key lock core includes: a lock core body having a longitudinal axis and including a groove; a lock post assembly, which is disposed in the lock core body and can rotate around the longitudinal axis; a plurality of The key follower and corresponding plurality of racks, etc., are placed in the lock cylinder assembly, in response to the application of a force inserted from an object into the core of the replaceable key to facilitate replacement of the key to a new key , At least one of the plurality of racks is selectively disengaged from at least one of the plurality of key followers, at least one of the plurality of key followers includes a convex portion, and the plurality of racks At least one includes a plurality of convex portion receiving concave portions on the first side to receive the convex portion, each convex portion receiving concave portion is separated by a convex portion receiving concave portion distance, the convex portion receiving concave portion distance is formed by the immediately adjacent convex Measured between the bottom of the receiving recess; wherein at least one of the plurality of racks includes an engagement groove on the second side opposite to the first side, wherein a height of the groove is from an engagement groove opening The bottom to the bottom of the engagement groove of the locking rod is measured in a direction in which the at least one of the plurality of racks travels in the lock post assembly, the engagement groove has a distance greater than the distance of the convex receiving recess Groove height; a locking lever for blocking the rotation of the lock cylinder assembly relative to the lock body to prevent unlocking of the replaceable key lock core using an unauthorized object, the locking lever can be locked at the At least a portion of the lever is held in a locked position in the groove of the lock body, and moved between an unlocked position in which the locking lever is located outside the groove and at least partially in the engagement groove; and an offset A pressing member, which pushes the locking rod toward the plurality of racks; wherein the locking rod is structurally designed such that the force from using an unauthorized object to twist the lock cylinder assembly is converted to the plurality of racks Dominate It is to be distributed between the main body of the lock core and the locking rod, thereby enhancing the torque resistance of the replaceable key lock core. The replaceable key lock core of claim 1, wherein the lock lever includes a surface that engages a surface of the groove when the lock lever is in the locked position, wherein the lock lever is engaged when the lock lever is in the locked position The respective surfaces of the at least one locking lever and the groove are in approximately parallel planes. The replaceable key lock core of claim 2, wherein when the lock lever is in the locked position, the surface of the lock lever that engages the groove in the key body is not an inclined surface. The replaceable key lock core of claim 2, wherein the surface of the lock rod that engages the groove in the core body when the lock rod is in the locked position is a flat surface. The replaceable key lock core of claim 2, wherein the surface of the lock lever that engages the groove in the core body is in a plane approximately parallel to an axis that is radial to the longitudinal axis. The replaceable key lock core of claim 1, wherein when the lock lever is in the locked position, an edge of the lock lever is received in the groove of the lock body. The replaceable key lock core of claim 6, wherein the edge of the lock lever is substantially square. The replaceable key lock core of claim 6, wherein the edge of the lock lever has an approximately rectangular cross-section. A replaceable key lock core includes: a lock core body having a longitudinal axis including a groove; a lock post assembly disposed in the lock core body and rotatable about the longitudinal axis; a carrier The assembly, which includes a plurality of racks and at least one locking lever; a plurality of key followers, which are placed in the lock cylinder assembly, etc., in response to The application of a force inserted into the core of the replaceable key from an object to facilitate replacement of the key to a new key, at least one of the plurality of racks is selectively from at least one of the plurality of key followers Detached, at least one of the plurality of key followers includes a convex portion, and at least one of the plurality of racks includes a plurality of convex portion receiving concave portions on the first side to receive the convex portions, each convex portion receiving The concave portion is separated by a convex portion receiving the concave portion distance, which is measured between the bottom parts of the adjacent convex portion receiving concave portions; wherein at least one of the plurality of racks is opposite to the The second side of the first side includes an engaging groove, wherein the height of a groove is from the opening edge of an engaging groove to a bottom of the engaging groove of the locking rod, and the at least one of the plurality of racks is at the Measured in one direction of travel in the lock cylinder assembly, the engagement groove has a groove height greater than the distance of the convex portion receiving the concave portion; wherein the at least one locking lever can move transversely to the longitudinal axis and rotatably move about the longitudinal axis, Wherein at least a part of the at least one locking lever is movable in a locking position in the groove of the lock body and one of the grooves in the lock body and at least partially in the engagement groove Between unlocked positions; and wherein the at least one locking lever is structurally designed to prevent the use of an unauthorized object to unlock the replaceable key cylinder, wherein the at least one locking lever is structurally designed to result from the use of an unauthorized object The force for twisting the lock cylinder assembly is mainly distributed between the lock cylinder body and the carrier assembly as compared to any force transformed into the plurality of racks. The replaceable key lock core of claim 9 further includes a biasing member that pushes the at least one locking lever toward one of the plurality of racks. The replaceable key lock core of claim 10, wherein the plurality of key followers are spring loaded and wherein a spring force of one of the biasing members is less than a spring force of one of the spring loaded key followers. A replaceable key lock core includes: a lock core body having a longitudinal axis including a groove; a lock post assembly, which is disposed in the lock core body and can rotate around the longitudinal axis; a plurality of The key follower and corresponding plurality of racks, etc., are placed in the lock cylinder assembly, in response to the application of a force inserted from an object into the core of the replaceable key to facilitate replacement of the key to a new key , At least one of the plurality of racks is selectively disengaged from at least one of the plurality of key followers, at least one of the plurality of key followers includes a convex portion, and the plurality of racks At least one includes a plurality of convex portion receiving concave portions on the first side to receive the convex portion, each convex portion receiving concave portion is separated by a convex portion receiving concave portion distance, the convex portion receiving concave portion distance is formed by the immediately adjacent convex Measured between the bottom of the receiving recess; wherein at least one of the plurality of racks includes an engagement groove on the second side opposite to the first side, wherein a height of the groove is from an engagement groove opening The bottom to the bottom of the engagement groove of the locking rod is measured in a direction in which the at least one of the plurality of racks travels in the lock post assembly, the engagement groove has a distance greater than the distance of the convex receiving recess Groove height; at least one locking lever, which can be moved transversely to the longitudinal axis and rotatably about the longitudinal axis, wherein at least a part of the at least one locking lever can be moved to lock in one of the grooves of the lock body Between the position and the unlocking position out of the groove in the lock body and at least partially in the engagement groove; wherein the portion of the at least one locking lever received in the groove has an approximately rectangular shape Cross section; and a biasing member, which pushes the at least one locking rod toward the plurality of racks. The replaceable key lock core of claim 12, wherein the plurality of key followers are spring loaded and wherein a spring force of one of the biasing members is less than a spring force of the spring loaded key followers.

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