Replaceable key lock cylinder

Abstract

A replaceable key lock cylinder is provided, comprising a core, an inner sleeve, and a plug assembly. The plug assembly includes multiple key followers and corresponding multiple first racks and multiple second racks disposed in a carrier. The first racks correspond to the operation of a user key, and the second racks correspond to the operation of a master key. Therefore, the lock cylinder can be used in a user / master key system. Disengaging either the first or second rack from the key followers allows for key replacement of the lock cylinder with either a user key or a master key.

Description

[0001] Cross-reference to related applications

[0002] This application was filed as a PCT international application on January 10, 2024, and claims priority and benefit to U.S. Provisional Patent Application No. 63 / 438,075, filed on January 10, 2023, the disclosure of which is incorporated herein by reference in its entirety. Background Technology

[0003] Lock cylinders that allow key replacement without removing the mortise assembly are known. These types of locks are highly beneficial to consumers because the key can be easily changed without calling a locksmith. Additionally, master / user key systems are known, whereby the master key can open all locks in the system, although each lock also has its own unique user key. This type of system allows for organization along departmental or other functional lines to permit supervisory or emergency access. However, there is a need for a lock with replaceable keys that facilitates both master / user key systems and the replacement of both the master and user keys. Utility Model Content

[0004] This disclosure generally relates to locks, and more particularly, to locks having a replaceable key lock cylinder. According to one aspect of this disclosure, the replaceable key lock cylinder is equipped with a master key and a user key system. The replaceable key lock cylinder includes a plug assembly and an inner sleeve disposed within the cylinder body. The plug assembly allows for the reception of both a master key and a user key, and the lock cylinder is operated due to the selective engagement between the plug assembly, the inner sleeve, and the cylinder body. Furthermore, the plug assembly enables the replacement of both the master key and the user key without removing the plug assembly.

[0005] In one aspect, the present technology relates to a key-replaceable lock cylinder comprising: a core body defining a longitudinal axis; at least one pin slidably mounted on the core body; an inner sleeve disposed within the core body and selectively rotatable about the longitudinal axis, the inner sleeve defining a groove extending along the longitudinal axis and at least one pin opening; a plug assembly at least partially disposed within the inner sleeve and selectively rotatable about the longitudinal axis, the plug assembly including a plug body, at least one key follower, a first carrier subassembly, and a second carrier subassembly, wherein the plug body has a first side and an opposite second side, the at least one key follower is slidably mounted on the plug body, the first carrier subassembly is disposed on the first side of the plug body, the first carrier subassembly including: a first carrier selectively slidable along the longitudinal axis for key replacement between different user keys; and a locking lever. The first carrier subassembly is slidably mounted on a first carrier and selectively engages with a groove in the inner sleeve to prevent rotation of the plug assembly relative to the inner sleeve; and at least one first rack connected between the at least one key follower and the locking lever to control the movement of the locking lever. The second carrier subassembly is disposed on a second side of the plug body and includes: a second carrier selectively sliding along a longitudinal axis for key replacement between different master keys; at least one slider slidably mounted on the second carrier, wherein, based on the position of the at least one slider within the second carrier, the at least one pin selectively engages with at least one pin opening in the inner sleeve to prevent rotation of the inner sleeve relative to the core; and at least one second rack connected between the at least one key follower and the at least one slider to control the movement of the at least one slider.

[0006] In one example, the key-replaceable lock cylinder further includes at least one pin biasing member that biases the at least one pin toward the at least one pin opening in the inner sleeve. In another example, the at least one pin biasing member also biases the at least one slider inward relative to the second carrier. In yet another example, the at least one slider does not directly engage with the biasing member disposed within the second carrier. In still another example, the core includes a chimney-like portion that receives at least one pin, the chimney-like portion projecting radially from the outer surface of the core. In this example, the core has an inner surface facing the inner sleeve, the inner surface lacking longitudinally extending grooves.

[0007] In another example, the inner sleeve defines a plurality of circumferential slits. In yet another example, when the at least one first rack is positioned by a master key, at least a portion of the at least one first rack extends at least partially within a slit of the plurality of circumferential slits. In yet another example, when the at least one second rack is positioned in the keyway opening without a key, at least a portion of the at least one second rack extends at least partially within a slit of the plurality of circumferential slits. In the example, the at least one key follower includes a first rack engagement feature configured to engage the at least one first rack and a second rack engagement feature configured to engage the at least one second rack, the first rack engagement feature being identical to the second rack engagement feature. In another example, the at least one key follower includes a first rack engagement feature configured to engage the at least one first rack and a second rack engagement feature configured to engage the at least one second rack, the first rack engagement feature being different from the second rack engagement feature.

[0008] In yet another example, the at least one first rack includes a first pin engagement feature configured to engage the at least one key follower, and the at least one second rack includes a second pin engagement feature configured to engage the at least one key follower, the first pin engagement feature being identical to the second pin engagement feature. In still another example, the at least one first rack includes a first pin engagement feature configured to engage the at least one key follower, and the at least one second rack includes a second pin engagement feature configured to engage the at least one key follower, the first pin engagement feature being different from the second pin engagement feature. In one example, the at least one second rack includes a slider engagement feature configured to engage the at least one slider. In another example, the slider engagement feature is a single protruding lug. In yet another example, the plug assembly includes a plug face extending from an end of a plug body, the plug face defining a first key change tool opening aligned with a first carrier and a second key change tool opening aligned with a second carrier, the size or shape of the first key change tool opening being different from the size or shape of the second key change tool opening.

[0009] On the other hand, this technology relates to a key-replaceable lock cylinder comprising a core assembly, an inner sleeve, and a plug assembly. The core assembly includes a core body defining a longitudinal axis and at least one pin mounted on the core body. The inner sleeve is disposed within the core body and defines a groove extending along the longitudinal axis and at least one pin opening for receiving at least a portion of the at least one pin. The at least one pin is biased inward toward the inner sleeve and is selectively movable between an engaged position and a disengaged position. In the engaged position, it prevents the inner sleeve from rotating relative to the core body about the longitudinal axis; in the disengaged position, it allows the inner sleeve to rotate freely. For the core to rotate about a longitudinal axis, the plug assembly is at least partially disposed within the inner sleeve. The plug assembly includes a plug body, at least one key follower, a first carrier subassembly, and a second carrier subassembly. The plug body defines a keyway opening. The at least one key follower is slidably mounted on the plug body. The first carrier subassembly has a locking lever and at least one first rack, the at least one first rack being connected between the locking lever and the at least one first rack. The locking lever is selectively movable between a locked position and an unlocked position when a valid user key is received within the keyway opening. In the locked position, the locking lever is at least partially disposed within a groove in the inner sleeve, thereby preventing the plug assembly from rotating relative to the inner sleeve about a longitudinal axis. In the unlocked position, the locking lever retracts from the groove in the inner sleeve, thereby allowing the plug assembly to rotate relative to the inner sleeve about a longitudinal axis. Furthermore, the at least one first rack is selectively disengaged from the at least one key follower to allow key replacement between different user keys. The second carrier subassembly has at least one slider and at least one second rack, the at least one second rack being coupled between the at least one slider and the at least one second rack. At least one slider is selectively movable between a blocked position and an unblocked position when a valid master key is received in the key slot opening, wherein, in the blocked position, the at least one slider extends into the at least one pin opening of the inner sleeve, thereby pressing the at least one pin toward a disengaged position, wherein, in the unblocked position, the at least one slider retracts from the at least one pin opening of the inner sleeve, thereby allowing the at least one pin to move toward an engaged position, and wherein the at least one second rack is selectively disengaged from the at least one key follower to allow key changing between different master keys.

[0010] In one example, after a valid user key is received, the at least one slider is in an unobstructed position, thereby allowing the plug assembly to rotate about the longitudinal axis, while the at least one pin is in an engaged position, thus preventing the inner sleeve from rotating about the longitudinal axis. In another example, after a valid user key is received, both the at least one first rack and the at least one second rack move together with the at least one key follower. In yet another example, after a valid master key is received, the at least one slider is in an obstructed position, thereby allowing the inner sleeve and the plug assembly to rotate together about the longitudinal axis, while the at least one pin is in an disengaged position. In yet another example, after a valid master key is received, both the at least one first rack and the at least one second rack move together with the at least one key follower. In this example, the at least one first rack is movable in the lateral direction relative to the longitudinal axis, and the at least one first rack has an engaged position such that the end of the at least one first rack extends into the inner sleeve when the valid master key is in the key slot opening.

[0011] In another example, the at least one second rack is movable in a lateral direction relative to the longitudinal axis, and the at least one second rack has an engaged position such that the end of the at least one second rack extends into the inner sleeve when no key is received in the key slot opening. In yet another example, the at least one pin is biased toward an engaged position. In still another example, the locking lever is biased toward an unlocked position. In this example, the at least one slider is not directly biased. In another example, the at least one first rack is different from the at least one second rack.

[0012] In yet another example, the at least one pin is biased toward the engaged position, and the locking lever is biased toward the unlocked position, with the biasing directions of the at least one pin and the locking lever being in opposite directions.

[0013] In another aspect, the present technology relates to a method of assembling a key-replaceable lock cylinder, the method comprising: providing a cylinder assembly having a core body defining a longitudinal axis and a chimney-like portion receiving at least one pin slidable therein; providing an inner sleeve defining a groove extending along the longitudinal axis and at least one pin opening; providing a plug assembly having a plug body and at least one key follower slidable within the plug body; mounting a first carrier subassembly to a first side of the plug body of the plug assembly, the first carrier subassembly having a first carrier, a locking lever, and at least one first rack, wherein the first carrier is selectively slidable along the longitudinal axis for key replacement between different user keys, the locking lever is slidably mounted on the first carrier and selectively engages with the groove of the inner sleeve, the at least one first rack being coupled between the at least one key follower and the locking lever to control movement of the locking lever; and mounting a second carrier subassembly to the plug assembly. The second side of the plug body includes a second carrier subassembly having a second carrier, at least one slider, and at least one second rack, wherein the second carrier is selectively slidable along a longitudinal axis for key replacement between different master keys, the at least one slider is slidably mounted on the second carrier, wherein, based on the position of the at least one slider within the second carrier, the at least one pin is selectively engaged with the at least one pin opening of the inner sleeve, and the at least one second rack is connected between the at least one key follower and the at least one slider to control the movement of the at least one slider; the plug assembly, including the first carrier subassembly and the second carrier subassembly, is at least partially inserted into the inner sleeve, wherein the plug assembly is selectively rotatable within the inner sleeve based on the position of the locking lever and the at least one slider; and the inner sleeve with the plug assembly is at least partially inserted into the core, wherein the inner sleeve is selectively rotatable within the core based on the position of the at least one pin.

[0014] Various additional aspects will be set forth in the following description. These aspects may involve a single feature or a combination of features. It should be understood that the foregoing general description and the following detailed description are merely exemplary and illustrative, and not intended to limit the broad inventive concept upon which the embodiments disclosed herein are based. Attached Figure Description

[0015] The following figures illustrate specific embodiments of the present disclosure and therefore do not limit the scope of the disclosure. The figures are not drawn to scale and are intended to be used in conjunction with the explanations in the following detailed description. Embodiments of the present disclosure will be described below in conjunction with the figures, wherein like reference numerals indicate like elements.

[0016] Figure 1 This is a perspective view of an exemplary key-replaceable lock cylinder according to an embodiment of the present disclosure.

[0017] Figure 2 yes Figure 1 An exploded perspective view of a lock cylinder with replaceable keys is shown in the image.

[0018] Figure 3 yes Figure 1 and Figure 2 The figure shows a perspective view of the key follower of a lock cylinder with replaceable keys.

[0019] Figure 4 This is another three-dimensional view of the key follower.

[0020] Figure 5 yes Figure 1 and Figure 2 The image shows a perspective view of the first rack of a lock cylinder with a replaceable key.

[0021] Figure 6 This is another three-dimensional view of the first rack.

[0022] Figure 7 yes Figure 1 and Figure 2 The image shows a perspective view of the second rack of a lock cylinder with a replaceable key.

[0023] Figure 8 This is another perspective view of the second rack.

[0024] Figure 9 yes Figure 1 and Figure 2 The image shows a perspective view of the sliding mechanism of a lock cylinder with an interchangeable key.

[0025] Figure 10 yes Figure 1 and Figure 2 The image shows a perspective view of the locking lever of a lock cylinder with an interchangeable key.

[0026] Figure 11 yes Figure 1 and Figure 2 The image shows a perspective view of the pins of a lock cylinder with a replaceable key.

[0027] Figure 12 yes Figure 1 and Figure 2 The diagram shows a cross-sectional perspective view of the keyless lock cylinder after receiving a valid user key.

[0028] Figure 13 yes Figure 12 The figure shows a cross-sectional perspective view of a lock cylinder with a replaceable key, in which the plug assembly rotates within the lock cylinder.

[0029] Figure 14 yes Figure 1 and Figure 2 The diagram shows a cross-sectional perspective view of the keyless lock cylinder after receiving a valid master key.

[0030] Figure 15 yes Figure 14 The figure shows a cross-sectional perspective view of a lock cylinder with replaceable keys, in which the plug assembly and inner sleeve rotate within the lock cylinder.

[0031] Figure 16 yes Figure 1 and Figure 2 The figure shows a cross-sectional perspective view of a lock cylinder with a replaceable key in the first key-changing configuration.

[0032] Figure 17 yes Figure 1 and Figure 2 The figure shows a cross-sectional perspective view of the lock cylinder with a replaceable key in the second key-changing configuration.

[0033] Figure 18 This is a perspective view of another exemplary key-replaceable lock cylinder according to another embodiment of the present disclosure.

[0034] Figure 19 yes Figure 18 An exploded perspective view of a lock cylinder with replaceable keys is shown in the image.

[0035] Figure 20 yes Figure 18 and Figure 19 The image shows a perspective view of the inner sleeve of a lock cylinder with a replaceable key.

[0036] Figure 21 yes Figure 18 and Figure 19 The figure shows a perspective view of the key follower, first rack, and second rack of a lock cylinder with a replaceable key. Detailed Implementation

[0037] The accompanying drawings and descriptions provided herein may have been simplified to illustrate aspects relevant to a clear understanding of the apparatuses, systems, and methods described herein, while other aspects that may be present in typical apparatuses, systems, and methods have been omitted for clarity. Those skilled in the art will recognize that other elements and / or operations may be necessary and / or required to implement the apparatuses, systems, and methods described herein. Because such elements and operations are well known in the art, and because they may not facilitate a better understanding of this disclosure, they may not be discussed herein. However, this disclosure is considered to inherently include all such elements, variations, and modifications to the described aspects that are known to those skilled in the art.

[0038] References to "an embodiment," "implementation," "illustrative embodiment," "example," "aspect," etc., in the specification indicate that the described embodiment may include specific features, structures, or characteristics, but each embodiment may or may not include that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Additionally, when a specific feature, structure, or characteristic is described in connection with an embodiment, whether explicitly described or not, it is considered that implementing such a feature, structure, or characteristic in conjunction with other embodiments is within the knowledge of those skilled in the art. Furthermore, it should be understood that items included in a list in the form of "at least one of A, B, and C" can refer to: (A); (B); (C); (A and B); (A and C); (B and C); or (A, B, and C). Similarly, items listed in the form of "at least one of A, B, or C" can refer to: (A); (B); (C); (A and B); (A and C); (B and C); or (A, B, and C). Furthermore, those skilled in the art will understand the extent conveyed by terms such as "about," "approximately," or "roughly" based on the measurement techniques used herein. For the extent to which these terms may not be clearly defined or understood by those skilled in the art, the term “about” should mean plus or minus ten percent.

[0039] In the accompanying drawings, some structural or methodological features may be shown in a specific arrangement and / or order. However, it should be understood that such a specific arrangement and / or order may not be necessary. Specifically, in some examples, such features may be arranged in a different manner and / or order than shown in the illustrative drawings. Furthermore, including structural or methodological features in a particular drawing does not mean that such features are required in all examples, and in some examples, such features may not be included, or may be combined with other features.

[0040] Throughout this specification, the reference orientations of the components of a replaceable key lock cylinder (e.g., front, back, top, bottom, rear, right, left, up, down, etc.) relate to their position when mounted on a door or handle and are used solely for ease of description and illustration. There are no limitations to the use of these terms regardless of how the components of the replaceable key lock cylinder are positioned independently. As used herein, the terms "axial" and "longitudinal" refer to a direction and orientation extending generally parallel to the centerline of the component or system. Furthermore, the terms "radial" and "radially" refer to a direction and orientation extending generally perpendicular to the centerline of the component or system. Additionally, as used herein, the terms "circumferential" and "circumferentially" refer to a direction and orientation extending arcuately around the centerline of the component or system.

[0041] In the example described below, the keyless lock cylinder is equipped with a master key and user key system. The keyless lock cylinder includes a plug assembly and an inner sleeve disposed within the cylinder body. The plug assembly allows both the master key and the user key to be accepted, and the lock cylinder is operated due to the selective engagement between the plug assembly, the inner sleeve, and the cylinder body. Additionally, the plug assembly enables key replacement of both the master key and the user key without removing the plug assembly.

[0042] Figure 1 This is a perspective view of an exemplary key-replaceable lock cylinder 100. Figure 2 This is a 3D exploded view of the key-replaceable lock cylinder 100. Also refer to... Figure 1 and Figure 2 The keyless lock cylinder 100 includes a cylinder assembly 102 having a core 104 defining a longitudinal axis 106. The core 104 is substantially cylindrical and hollow. In this example, the core 104 has an inner surface 108 that is substantially smooth and does not have any longitudinally extending grooves defined within it (e.g., for receiving at least a portion of a locking lever). The core 104 also includes a radially extending chimney-like portion 110 projecting from an outer surface 112 of the core 104. In this example, the chimney-like portion 110 extends near a front end portion 114 of the core 104 and is offset relative to a rear end portion 116 of the core 104. A plurality of channels 118 are defined by the chimney-like portion 110 and extend through the chimney-like portion 110. A pin 120 is slidably mounted within each channel 118 of the chimney-like portion 110. Pin 120 is biased by biasing member 122 (e.g., compression spring). Cover 124 is used to hold pin 120 and biasing member 122 within chimney-shaped portion 110.

[0043] An inner sleeve 126 is provided within the core 104 and is selectively rotatable about a longitudinal axis 106. The inner sleeve 126 is substantially cylindrical in shape to correspond to the inner surface 108 of the core 104. The inner sleeve 126 defines a groove 128 extending along the longitudinal axis 106. In the example, the groove 128 extends completely through the inner sleeve 126. The inner sleeve 126 also defines a plurality of pin openings 130. In the example, the pin openings 130 are positioned opposite the groove 128 (e.g., spaced 180° apart); however, while the groove 128 is elongated along the longitudinal length of the inner sleeve 126, the pin openings 130 are discrete and spaced apart along the longitudinal length of the inner sleeve 126. The inner sleeve 126 also defines a plurality of circumferential slits 132. The circumferential slits 132 are longitudinally aligned with the spacing of the pin openings 130. Each pin opening 130 has four corresponding discrete circumferential slits 132, namely, two slits located on opposite sides of the groove 128 and two slits located on opposite sides of the pin opening 130.

[0044] The plug assembly 134 is at least partially disposed within the inner sleeve 126 and the core 104. The plug assembly 134 is selectively rotatable about a longitudinal axis 106. The plug assembly 134 includes a plug body 136 supporting a plurality of key followers 138 (e.g., spring-loaded pins), a user key carrier subassembly 140, and a master key carrier subassembly 142. The plug body 136 includes a plug surface 144 located at the front of the plug body 136 and a drive portion 146 located at the rear of the plug body 136. The drive portion 146 is configured to engage with and drive a corresponding rotation of a torque vane (not shown) to operate a latch assembly (not shown). The drive portion 146 includes a circumferential recess 148 for receiving at least a portion of the retainer clip 150 and for retaining the plug assembly 134 and the inner sleeve 126 within the core 104. The plug surface 144 defines a keyway opening 152 that extends into an intermediate portion 154 between the plug surface 144 and the drive portion 146. The plug body 136 has a single keyway opening 152 configured to receive both a user key and a master key. The plug surface 144 also defines a first key-changing tool opening 156 on one side of the keyway opening 152 and a second key-changing tool opening 158 on the other side. The first key-changing tool opening 156 is aligned with and facilitates access to the user key carrier subassembly 140, and the second key-changing tool opening 158 is aligned with and facilitates access to the master key carrier subassembly 142. In this example, the first key-changing tool opening 156 has a different size and / or shape than the second key-changing tool opening 158. In other respects, the first key-changing tool opening 156 and the second key-changing tool opening 158 may have similar sizes and / or shapes.

[0045] The intermediate portion 154 has a plurality of channels 160 extending radially relative to the longitudinal axis 106. A key follower 138 is slidably mounted within the channels 160 and biased by a biasing member 162 (e.g., a compression spring). The key follower 138 and the biasing member 162 are held within the channels 160 by a retaining cap 164. The channels 160 extend partially through the intermediate portion 154 and lead to opposite first planar sides 166 and second planar sides 168 of the intermediate portion 154. Each of the planar sides 166, 168 includes a plurality of bullet-shaped protrusions 170 that selectively engage with the racks of the carrier subassemblies 140, 142 and facilitate key replacement.

[0046] User key carrier subassembly 140 is disposed on a first side 166 of plug body 136. User key carrier subassembly 140 includes a first carrier 172, a plurality of first racks 174 slidably supported on the first carrier 172, and a locking lever 176. The first carrier 172 is selectively slidable along longitudinal axis 106 for key replacement between different user keys and is biased by a first return spring 178. Additionally, a first spring catch 180 is provided for key replacement on the first carrier 172. The locking lever 176 is slidably mounted on the first carrier 172 and is at least partially mounted within a locking lever slot. The locking lever 176 is biased by a pair of biasing members 182 (e.g., compression springs) held on the first carrier 172 by a pair of clips 184. The first racks 174 are coupled between the key follower 138 and the locking lever 176 to control the movement of the locking lever 176.

[0047] A master key carrier subassembly 142 is disposed on a second side 168 of the plug body 136. The master key carrier subassembly 142 includes a second carrier 186, a plurality of second racks 188 slidably supported on the second carrier 186, and a plurality of sliders 190 (e.g., wafers). The second carrier 186 is selectively slidable along a longitudinal axis 106 for key replacement between different master keys and is biased by a second return spring 192. Additionally, a second spring catch 194 is provided for the second carrier 186 for key replacement. The sliders 190 are slidably mounted within a plurality of holes 196 defined within the second carrier 186 and orthogonal to the longitudinal axis 106. Unlike the elongated locking lever 176 that engages with each of the first racks 174, the sliders 190 are discrete, and each of the second racks 188 engages with its own slider 190. The second rack 188 is connected between the key follower 138 and the slider 190 to control the movement of the slider 190.

[0048] like Figure 2As shown, the plug body 136 has five channels 160, allowing five key followers 138, five first racks 174 and five second racks 188, and five sliders 190 to be supported within the plug assembly 134. Each position of the five key followers 138 corresponds to an engagement position on the key, such that when the key is inserted, the key followers 138 move up and down within the channels 160, positioning the corresponding racks 174, 188 within the plug assembly 134 for actuating the key-replaceable lock cylinder 100. For simplicity, four key followers 138, four first racks 174 and four second racks 188, and four sliders 190 are illustrated. It should be understood that the plug assembly 134 can support any number of key followers 138 (e.g., 3, 4, 5, 6, etc.) for any number of engagement positions as needed or desired. In the example, the key follower 138, rack 174, 188, and slider 190 are identical in each of the five positions. In other examples, one or more of the key follower 138, rack 174, 188, and slider 190 located in the last position (e.g., furthest from the plug face and rack) may differ from the other positions and are configured, for example, to retain the user key and / or master key within the keyway opening 152 when the plug assembly 134 is in the rotated position during operation.

[0049] Figure 3 and Figure 4 This is a perspective view of the key follower 138. The key follower 138 includes a cylindrical body 198 having a top end portion 200 and an opposite bottom end portion 202. The top end portion 200 is open, allowing the biasing member 162 (as shown in the image) to pass through. Figure 2 (As shown) is at least partially received within the body 198. The bottom end 202 has a tapered nose configured to allow the key follower 138 to engage with the plug assembly 134 (as shown). Figure 2 When moving inside (as shown), it engages with the key.

[0050] The body 198 includes a first support 204 extending from the body 198 and supporting a first rack engagement feature 206. The first rack engagement feature 206 is configured to selectively engage with a first rack 174 (e.g., at multiple different locations) at multiple different locations. Figures 5 to 6 (As shown) engagement. In the example, the first rack engagement feature 206 is a post (such as) extending in the direction along the longitudinal axis 106. Figure 1 (As shown). The column may include multiple semi-circular ridges, and for example, three ridges on one side and two ridges on the other side. The body 198 also includes a second support 208 extending from the body 198 and supporting the second rack engagement feature 210. The second rack engagement feature 210 is configured to selectively engage with the second rack 188 (e.g., at multiple different locations) at multiple different locations. Figures 7 to 8(As shown) engagement. In the example, the second rack engagement feature 210 is a post extending along the longitudinal axis 106 and parallel to the first rack engagement feature 206. This post may include multiple semi-circular ridges, and for example, three ridges on one side and two ridges on the other side. In one respect, the first rack engagement feature 206 is the same as the second rack engagement feature 210. In other respects, the first rack engagement feature 206 may differ from the second rack engagement feature 210.

[0051] Figure 5 and Figure 6 This is a perspective view of the first rack 174. The first rack 174 has a facing locking lever 176 (e.g., Figure 2 The first side portion 212 (as shown) and the key follower 138 (as shown) Figure 3 and Figure 4 The second side 214 is opposite to the first side 212 (shown). A locking lever engagement groove 216 is defined in the first side 212. The first side 212 is substantially planar above and below the locking lever engagement groove 216. A first pin engagement feature 218 is defined near the second side 214. The first pin engagement feature 218 is configured to selectively engage with the key follower 138 at multiple different locations. The first pin engagement feature 218 is configured to selectively engage with the first rack engagement feature 206 of the key follower 138. In the example, the first pin engagement feature 218 is a groove that extends in the top-bottom direction. The groove may include multiple semi-circular grooves on each side of the groove, and, for example, the grooves on one side of the groove are offset relative to the grooves on the other side of the groove. The first side 212 also includes a protruding feature 170 on the plug body 136 (such as... Figure 2 The corresponding groove 220 (as shown).

[0052] Figure 7 and Figure 8 This is a perspective view of the second rack 188. The second rack 188 has a face-to-face key follower 138 (e.g., Figure 3 and Figure 4 The first side portion 222 (as shown) and the sliding member 190 (as shown) Figure 2 The first side 222 is opposite to the first side 222. A second pin engagement feature 226 is defined near the first side 222. The second pin engagement feature 226 is configured to selectively engage with a second rack engagement feature 210 of the key follower 138. In the example, the second pin engagement feature 226 is a groove extending in the top-bottom direction. The groove may include a plurality of semi-circular recesses on each side of the groove, and, for example, the recesses on one side of the groove are offset relative to the recesses on the other side of the groove. The first side 222 also includes a protruding feature 170 on the plug body 136 (e.g., Figure 2(As shown) Corresponding groove 228. A slider engagement feature 230 is defined in the second side 224. The slider engagement feature 230 is configured to engage with the slider 190. In the example, the slider engagement feature 230 is a single protruding lug. The lug may include a top cam surface 232 and a bottom cam surface 234 tapering toward each other at a stop surface 236. The stop surface 236 has a length 238 that engages with the slider 190 and blocks movement of the slider 190. The stop surface 236 also extends a distance 240 from the first side 222, which corresponds to the sliding distance of the slider 190. The first side 222 is substantially planar above and below the slider engagement feature 230.

[0053] Simultaneously refer to Figures 3 to 8 The key follower 138 is configured to engage each rack 174, 188 in multiple engagement positions (e.g., positions where the rack engagement feature of the key follower is coupled to the pin engagement feature of the rack for operation of the lock cylinder described herein). The term "engagement position" refers to the depth of the key cut in the key engagement sequence. Engagement positions are typically identified by numbers or letters indicating the depth of the key cut and thus correspond to the position of the rack relative to the key follower, such that movement of the key follower within the lock cylinder relative to the key positions the rack in an operable position. In the example, since the user key is different from the master key, the engagement position of the first rack 174 is different from the engagement position of the second rack 188. It should be understood that while an example of rack engagement features and pin engagement features is illustrated, those skilled in the art will understand that other types of pin-rack engagement structures can be utilized. U.S. Patent Application Publication No. 2022 / 0213716A1, dated July 7, 2022, describes other examples of pin-rack engagement structures and is incorporated herein by reference in its entirety.

[0054] In the example, the first pin engagement feature 218 of the first rack 174 is the same as the second pin engagement feature 226 of the second rack 188. In other examples, the first pin engagement feature 218 of the first rack 174 may be different from the second pin engagement feature 226 of the second rack 188. That is, the structural configuration in which the key follower 138 engages with each rack 174, 188 may be different between the racks, and this document considers using different engagement features on different sides of the key follower 138. Because the first rack 174 includes a locking lever engagement groove 216 and the second rack 188 includes a sliding engagement feature 230, the first rack 174 may also have engagement features different from those of the second rack 188.

[0055] Figure 9This is a perspective view of the slider 190. The slider 190 includes a first end portion 242 and an opposite second end portion 244. The first end portion 242 includes a tapered nose having an upper cam surface 246 and a lower cam surface 248 and is configured to engage with the slider feature 230 of the second rack 188 (e.g., Figure 7 and Figure 8 (As shown) engagement. The second end 244 has a square end with a flat surface 250 and is configured to engage with the pin 120 of the core assembly 102 and the pin opening 130 of the inner sleeve 126 (both within...). Figure 2 (As shown in the image) engagement.

[0056] Figure 10 This is a perspective view of the locking lever 176. The locking lever 176 includes a first end 252 and an opposite second end 254. The first end 252 has a square end with a planar surface 256 and is configured to engage with the groove 128 of the inner sleeve (as shown in the image). Figure 2 (As shown) engagement. The second end 254 includes a tapered nose having an upper cam surface 258 and a lower cam surface 260 and is configured to engage with the locking bar of the first rack 174 in a groove 216 (as shown). Figure 5 and Figure 6 (As shown) engagement. Locking lever 176 also includes a component for at least partially supporting bias member 182 (as shown). Figure 2 A pair of notches 262 (as shown).

[0057] Figure 11 This is a perspective view of pin 120. Pin 120 has a first end 264 and a second end 266. The first end 264 has an enlarged cylindrical head, and the second end 266 has a rectangular shape. The first end 264 is disposed within the cylindrical body 104 and positioned to abut against the offset member 122 (both within...). Figure 2 (As shown in the diagram). The second end 266 is configured to interact with the sliding member 190 and the pin opening 130 of the inner sleeve 126 (both within...). Figure 2 (As shown in the image) engagement.

[0058] Figure 12This is a cross-sectional perspective view of the keyless lock cylinder 100 when a valid user key 268 is received. When the valid user key 268 is received in the key slot opening 152 of the keyless lock cylinder 100, the keyless lock cylinder 100 is unlocked, allowing the plug assembly 134 to rotate within the inner sleeve 126 and causing the torque blades attached thereto to rotate. The first rack 174 is coupled to the key follower 138 such that the engaged position of the valid user key 268 positions the key follower 138 and thus the first rack 174 within the first carrier 172 at a position that aligns the locking lever engagement groove 216 with the second end 254 of the locking lever 176. Because the locking lever 176 is biased inward 270 toward the first rack 174, the second end 254 slides a distance into the locking lever engagement groove 216, a distance corresponding to the first end 252 of the locking lever 176 being disengaged from engagement with the groove 128 of the inner sleeve 126. Figure 12 As illustrated, locking lever 176 is positioned in the unlocked position, which allows plug assembly 134 to rotate relative to inner sleeve 126. Locking lever 176 is biased toward the unlocked position. The operative engagement of locking lever and first rack is similar to that described in U.S. Patent No. 10,612,271B2, dated April 7, 2020, the entire contents of which are incorporated herein by reference.

[0059] The engaged position of the valid user key 268 also positions the second rack 188 at a certain location within the second carrier 186. However, this position of the second rack 188 causes the slider engagement feature 230 to misalign with the slider 190. Therefore, the first end 242 of the slider 190 is positioned against the second side 224 of the second rack 188 and positioned above or below the slider engagement feature 230. The second end 244 of the slider 190 is positioned within the second carrier 186 and inside the inner sleeve 126, allowing the plug assembly 134 to rotate relative to the inner sleeve 126 due to the unlocking of the aforementioned locking lever 176. In this example, this position of the slider 190 is an unobstructed position. In the unobstructed position, the slider 190 is fully disposed within the hole 196 in the second carrier 186 and the second carrier 186.

[0060] When the locking lever 176 and the slider 190 are in the unlocked position, the inner sleeve 126 is prevented from rotating within the core 104 because the pin 120 is in the engaged position. The second end 266 of the pin 120 is pushed through the pin opening 274 defined in the core 104 and into the pin opening 130 of the inner sleeve 126 by the biasing member 122, with the pin 120 being radially inwardly biased 272 toward the engaged position. This position of the pin 120 prevents the second end 244 of the slider 190 from moving into the pin opening 130 of the inner sleeve 126 and facilitates rotation of the plug assembly 134 within the inner sleeve 126 and the core 104. In this example, the biasing direction 272 of the pin 120 is opposite to the biasing direction 270 of the locking lever 176. However, the slider 190 is not directly biased by the biasing member within the hole 196 of the second carrier 186. Specifically, the pin 120 is biased inward using the pin 120 and biasing member 122 disposed in the core 104, such that the slider 190 is pushed toward the second rack 188. In the example, the pin 120 is biased in a direction toward the inner sleeve 126 and toward the plug assembly 134.

[0061] Now go to Figure 13 , Figure 13 This is a cross-sectional perspective view of a keyless lock cylinder 100, in which a plug assembly 134 rotates. With the locking lever 176 positioned in the unlocked position and within the inner sleeve 126, and the slider 190 positioned in the unlocked position and within the inner sleeve 126, the plug assembly 134 is allowed to rotate and operate the attached torque blade. During rotation of the plug assembly 134, a first end 252 of the locking lever 176 is configured to slide along the inner surface 276 of the inner sleeve 126. Additionally, a second end 244 of the slider 190 is configured to slide along the inner surface 276 of the inner sleeve 126. A pin 120 engages with the inner sleeve 126 to prevent rotation of the inner sleeve 126 within the cylinder 104 when a valid user key 268 is used.

[0062] The replaceable key lock cylinder 100 defines two shear planes for lock cylinder operation. A first shear plane is defined between the inner surface 276 of the inner sleeve 126 and the outer surface of the plug assembly 134. A second shear plane is defined between the inner surface 108 of the cylinder 104 and the outer surface of the inner sleeve 126. When a valid user key 268 is inserted into the keyway opening 152, the locking lever 176 and the slider 190 are positioned inside the first shear plane, such that no locking component extends through the first shear plane, and rotation between the plug assembly 134 and the inner sleeve 126 is possible. However, a pin 120 is positioned within the second shear plane, preventing rotation of the inner sleeve 126 relative to the cylinder 104.

[0063] Figure 14This is a cross-sectional perspective view of the replaceable key lock cylinder 100 when a valid master key 278 is received. When the valid master key 278 is received in the key slot opening 152 of the replaceable key lock cylinder 100, the replaceable key lock cylinder 100 is unlocked, allowing the plug assembly 134 and the inner sleeve 126 to rotate together within the cylinder 104 and causing the torque blades attached thereto to rotate. The first rack 174 is coupled to the key follower 138 such that the engaged position of the valid master key 278 positions the key follower 138 and thus the first rack 174 within the first carrier 172 at a position where the locking lever engagement groove 216 is misaligned with the second end 254 of the locking lever 176. Therefore, the second end 254 of the locking lever 176 is positioned against the first side 212 of the first rack 174 and positioned above or below the locking lever engagement groove 216. The first end 252 of the locking lever 176 is positioned within a groove 128 of the inner sleeve 126, such that the plug assembly 134 engages with the inner sleeve 126, and neither the plug assembly 134 nor the inner sleeve 126 can rotate independently. In this example, this position of the locking lever 176 is the locked position. In the locked position, the locking lever 176 is at least partially disposed within the groove 128 to prevent rotation of the plug assembly 134 relative to the inner sleeve 126.

[0064] The engaged position of the valid master key 278 also positions the second rack 188 at a certain location within the second carrier 186. However, this position of the second rack 188 aligns the slider engagement feature 230 with the slider 190. Because the slider 190 can move within the hole 196 of the second carrier 186 and is aligned with the pin opening 130 of the inner sleeve 126, the distance the second end 244 of the slider 190 slides into the pin opening 130 corresponds to the distance the first end 242 of the slider 190 moves through the slider engagement feature 230. Figure 14 As illustrated, the slider 190 is positioned in the blocking position, which facilitates the engagement of the plug assembly 134 with the inner sleeve 126 and enables it to rotate together with the inner sleeve 126.

[0065] When the locking lever 176 is in the locked position and the slider 190 is in the blocked position, the inner sleeve 126 is engaged with the plug assembly 134, and both the inner sleeve 126 and the plug assembly 134 are rotatable within the core 104 due to the movement of the pin 120 toward the disengaged position. The movement of the slider 190 toward the blocked position overcomes the biasing force of the pin 120, and the pin 120 slides out of engagement with the pin opening 130 of the inner sleeve 126. Therefore, the second end 266 of the pin 120 is no longer engaged with the inner sleeve 126 and is fully disposed within the core 104. The inner sleeve 126 can then rotate relative to the core 104 while the plug assembly 134 is engaged with the inner sleeve 126.

[0066] like Figure 14 As shown, the circumferential slit 132 of the inner sleeve 126 is aligned with the racks 174 and 188. This configuration allows the top or bottom of the racks 174 and 188 to move at least partially within the circumferential slit 132 depending on the engagement position and the position of the key follower 138. For example, in Figure 14 In this configuration, the key follower 138 engages with the lowermost portion of the pin engagement feature of the first rack 174, while the key follower 138 engages with the uppermost portion of the pin engagement feature of the second rack 188. Therefore, the replaceable key lock cylinder 100 has an engagement position that allows at least a portion of the top of the first rack 174 to slide within the circumferential slit 132 of the inner sleeve 126 when the valid master key 278 is inserted into the key slot opening 152. Similarly, an engagement position may exist that allows the bottom of the first rack 174 to slide within the circumferential slit 132 of the inner sleeve 126 when the valid master key 278 is inserted into the key slot opening 152. When no key is inserted into the key slot opening 152, the key follower 138 can be biased such that either the top or bottom of the second rack 188 slides within the circumferential slit 132 of the inner sleeve 126. It is worth noting that, because the plug assembly 134 is locked to rotate together with the inner sleeve 126, only the engagement position of the valid master key 278 can achieve these uppermost and lowermost positions of the first rack 174. The engagement position of the valid user key 268 (e.g.) Figure 12 and Figure 13 (As shown) These uppermost and lowermost positions of the second rack 188 cannot be used because the plug assembly 134 must rotate independently of the inner sleeve 126 and the racks 174, 188 cannot be positioned within the first shear plane. When no key is inserted, one or both of the racks 174, 188 can be positioned across the first shear plane because the plug assembly 134 is configured not to rotate when no valid key is inserted.

[0067] Now go to Figure 15 , Figure 15This is a cross-sectional perspective view of a keyless lock cylinder 100, in which the plug assembly 134 and the inner sleeve 126 rotate. With the locking lever 176 positioned in the locked position and engaged with the inner sleeve 126, and the slider 190 positioned in the blocking position and engaged with the inner sleeve 126, rotation of the plug assembly 134 and the inner sleeve 126 is permitted, actuating the attached torque vane. During rotation of the plug assembly 134 and the inner sleeve 126, a first end 252 of the locking lever 176 is configured to slide along the inner surface 108 of the cylinder 104. Additionally, a second end 244 of the slider 190 is configured to slide along the inner surface 108 of the cylinder 104. The pin 120 disengages from the inner sleeve 126, such that when a valid master key 278 is used, the second end 266 slides against the outer surface of the inner sleeve 126. With the valid master key 278 in use, both the locking lever 176 and the slider 190 extend across the first shear plane, while no locking component extends across the second shear plane, thus enabling rotation of the plug assembly 134 and the inner sleeve 126.

[0068] Simultaneously refer to Figures 12 to 15 When a valid user key 268 and a valid master key 278 are received in the keyway opening 152, both the first rack 174 and the second rack 188 translate within the plug assembly 134. Racks 174 and 188 are axially aligned within the plug assembly 134. When a valid user key 268 is inserted, the first rack 174 is aligned with the locking lever 176, while the second rack 188 is not aligned with the slider 190. When a valid master key 278 is inserted, the first rack 174 is not aligned with the locking lever 176, while the second rack 188 is aligned with the slider 190. Due to the use of the inner sleeve 126, the configuration of the plug assembly 134 allows both the user key and the master key to operate the replaceable key lock cylinder 100. Conversely, other known locks with double racks—such as U.S. Patent No. 11,220,840B1, dated January 11, 2022, the entire contents of which are incorporated herein by reference—move the double racks to align with a single locking lever and allow a single key to operate the lock cylinder.

[0069] Furthermore, since the chimney-shaped portion 110 that accommodates the pin 120 and the pin 120 are configured to selectively engage the pin opening 130 of the inner sleeve 126, which is orthogonal to the key slot opening 152, the chimney-shaped portion 110 is also oriented orthogonal to the key slot opening 152 when the plug assembly 134 is in its original position. This is to allow the pin 120 to engage with the master key carrier subassembly 142.

[0070] On one hand, the valid user key 268 and the valid master key 278 have similar key sizes (but dissimilar key cuts). On the other hand, the valid user key 268 and the valid master key 278 can have different key sizes; however, the keyway opening 152 is configured to receive and operate both keys 268 and 278. Using different key sizes further facilitates the user key system and the master key system. Additionally, a larger master key can be used to retain it within the plug assembly during rotation. Furthermore, the user key cannot define any engagement position that matches the master key, otherwise the user key would be unable to operate the replaceable key lock cylinder 100, because at least one of the slides 190 would engage with the inner sleeve 126.

[0071] Figure 16 This is a cross-sectional perspective view of the key-replaceable lock cylinder 100 in its first key-replacement configuration. The user key carrier subassembly 140 is also configured to allow key replacement of the key-replaceable lock cylinder 100 without removing the insert assembly 134 from the inner sleeve 126 and the cylinder 104. To replace the key in the user key carrier assembly 140, a valid user key is inserted into the keyway opening 152 and the insert assembly 134 is rotated to the first or learning position. Figure 16 As illustrated, the first position is approximately 90° from the original position of the plug assembly 134. Because a valid user key is being used, the groove 220 of the first rack 174 is aligned with the protrusion 170. The first tool 280 is inserted into the first key-changing tool opening 156 (e.g., ...). Figure 1 As shown), in order to push the first carrier 172 and cause the entire user key carrier subassembly 140 along the longitudinal axis 106 toward the drive portion 146 of the plug body 136 (as shown). Figure 2 (As shown) move.

[0072] When the user key carrier subassembly 140 moves along the longitudinal axis, the first spring catcher 180 (e.g.) Figure 2 The first key carrier 172 is moved into one or more stop recesses (not shown) within the inner surface 108 of the core 104, such that the user key carrier subassembly 140 is captured in a rotational and translational position within the inner sleeve 126 and the core 104 (e.g., first replacement key configuration). Moving the first carrier 172 along the longitudinal axis 106 will engage the first rack engagement feature 206 of the key follower 138 (as shown). Figure 3 and Figure 4As shown, the first pin engagement feature 218 of the first rack 174 is withdrawn along a longitudinal direction parallel to the longitudinal axis 106. Then, the valid user key is removed, and the second user key is inserted into the key slot opening 152. Using the second user key, the plug assembly 134 is rotated back towards its original position, releasing the first spring catch 180. As the first spring catch 180 leaves the stop recess of the core 104, the first carrier 172 is held in place by the first return spring 178 (both in…). Figure 2 As shown in the diagram, the key follower 138 is biased toward the insertion surface 144, causing the first rack engagement feature 206 to be inserted into the first pin engagement feature 218 of the first rack 174 in a longitudinal direction parallel to the longitudinal axis 106. At this point, the key-replaceable lock cylinder 100 is adapted to the second (now active) key, and the first key is no longer convenient for operating the key-replaceable lock cylinder 100. This key-replacement operation is described in more detail in U.S. Patent No. 8,656,747B2, dated February 25, 2014, the entire contents of which are incorporated herein by reference.

[0073] Figure 17 This is a cross-sectional perspective view of the key-replaceable lock cylinder 100 in the second key-replacement configuration. The master key carrier subassembly 142 is also configured to allow key replacement of the key-replaceable lock cylinder 100 without removing the plug assembly 134 and inner sleeve 126 from the cylinder 104. To replace the key in the master key carrier subassembly 142, a valid master key is inserted into the keyway opening 152 and the plug assembly 134 and inner sleeve 126 are rotated to the first or learning position. Figure 17 As shown, the first position is approximately 90° from the original positions of the plug assembly 134 and the inner sleeve 126. Because a valid master key is used, the groove 228 of the second rack 188 is aligned with the position of the protrusion 170. The second tool 282 is inserted into the second key changing tool opening 158 (as shown). Figure 1 (as shown) so as to push the second carrier 186 and cause the entire master key carrier subassembly 142 and inner sleeve 126 along the longitudinal axis 106 toward the drive portion 146 of the plug body 136 (as shown). Figure 2 (As shown) move.

[0074] When the master key carrier subassembly 142 moves along the longitudinal axis, the second spring catcher 194 (as shown) Figure 2The key carrier 186 is moved into one or more stop recesses (not shown) within the inner surface 108 of the core 104, such that the master key carrier subassembly 142 and the inner sleeve 126 are captured in a rotational and translational position within the core 104 (e.g., a second replacement key configuration). Moving the second carrier 186 along the longitudinal axis 106 will engage the second rack engagement feature 210 of the key follower 138 (as shown). Figure 3 and Figure 4 (As shown) is pulled out from the second pin engagement feature 226 of the second rack 188 in a longitudinal direction parallel to the longitudinal axis 106. Then, the valid master key is removed, and the second master key is inserted into the key slot opening 152. Using the second master key, the plug assembly 134 and the inner sleeve 126 are rotated back to their original positions, releasing the second spring catch 194. As the second spring catch 194 leaves the stop recess of the core 104, the second carrier 186 is held in place by the second return spring 192 (both in...). Figure 2 As shown in the diagram, the key follower 138 is biased toward the insertion surface 144, causing the second rack engagement feature 210 of the key follower 138 to be inserted into the second pin engagement feature 226 of the second rack 188 in a longitudinal direction parallel to the longitudinal axis 106. At this time, the replaceable key lock cylinder 100 is adapted to the second (now valid) key, and the first key is no longer convenient for operating the replaceable key lock cylinder 100.

[0075] Simultaneously refer to Figure 16 and Figure 17 The first tool 280 differs from the second tool 282 in size and / or shape, and such that changing the user key requires a different tool than changing the master key. For example, the first tool 280 has an elongated plate shape, while the second tool 282 has an elongated L-shaped shape. In other examples, the first tool 280 and the second tool 282 may be substantially similar, and such that the same tool can be used to perform key changes for both the user key and the master key. In other examples, the key-replaceable lock cylinder 100 may be configured to have tool-free key-changing capability, as described in U.S. Patent No. 8,099,988, dated January 24, 2012, and U.S. Patent No. 11,319,726, dated May 3, 2022, the entire contents of which are incorporated herein by reference.

[0076] Figure 18 This is a perspective view of another exemplary key-replaceable lock cylinder 300. Figure 19 This is an exploded 3D diagram of the keyless lock cylinder 300. Also refer to... Figure 18 and Figure 19The key-replaceable lock cylinder 300 is configured to be operable using both a user key and a master key, and to facilitate key replacement of the user key and master key without removing the key-replaceable lock cylinder 300, similar to the key-replaceable lock cylinder 100 described above. Therefore, the differences between the two embodiments will be emphasized below.

[0077] The key-replaceable lock cylinder 300 includes a cylinder assembly 302 having a core 304 defining a longitudinal axis 306. The core 304 is substantially cylindrical and hollow, and has a radially extending chimney-like portion 308. A plurality of channels 310 are defined by the chimney-like portion 308. A pin 312 is slidably mounted within the channels 310 of the chimney-like portion 308. The pin 312 is biased by a biasing member 314 (e.g., a compression spring). An inner sleeve 316 is disposed within the core 304 and defines a groove 318, a plurality of pin openings 320, and a plurality of circumferential slits 322. The inner sleeve 316 is similar to the inner sleeve described above and is referred to below. Figure 20 To provide a more detailed description.

[0078] The plug assembly 324 is at least partially disposed within the inner sleeve 316 and the core 304. The plug assembly 324 includes a plug body 326 supporting a plurality of key followers 328 (e.g., spring-loaded pins), a user key carrier subassembly 330, and a master key carrier subassembly 332. The plug body 326 includes a plug face 334 and an opposing drive portion 336. The drive portion 336 includes a circumferential recess 338 for receiving at least a portion of a retainer clip 340. The plug face 334 defines a key slot opening 342 extending into the intermediate portion 344, and also defines a first key change tool opening 346 and a second key change tool opening 348. In this example, the first key change tool opening 346 and the second key change tool opening 348 have similar dimensions and / or shapes.

[0079] The intermediate portion 344 has multiple channels 350, and a key follower 328 is slidably mounted within the channels 350 and biased by a biasing member (not shown) held by a retaining cap 352. Each planar side of the intermediate portion 344 includes multiple bullet-shaped protrusions 354 for easy key replacement. The user key carrier subassembly 330 includes a first carrier 356, multiple first racks 358, and a locking lever 360. The first carrier 356 is selectively slidable along a longitudinal axis 306 for key replacement via a first return spring (not shown). Additionally, a first spring catch (not shown) is provided for the first carrier 356 for key replacement. The locking lever 360 is biased by a pair of biasing members 362, which are held on the first carrier 356 by a pair of clips 364. The master key carrier subassembly 332 includes a second carrier 366, multiple second racks 368, and multiple sliders 370. The second carrier 366 is selectively slidable along the longitudinal axis 306 for key replacement between different master keys and is biased by a second return spring (not shown). Additionally, a second spring catch (not shown) is provided for the second carrier 366 for key replacement. A slider 370 is slidably mounted within a plurality of holes 372 defined within the second carrier 366.

[0080] Figure 20 This is a perspective view of the inner sleeve 316, which is identical or similar to the inner sleeve 126 described above. The inner sleeve 316 has a first end 376 and an opposite second end 378 extending along the longitudinal axis. The inner sleeve 316 is substantially cylindrical and hollow. The outer surface 380 faces the core 304 (as shown in the image). Figure 19 The inner surface 382 (as shown) slides against the inner surface of the core 304. The inner surface 382 faces the plug assembly 324 (as shown). Figure 19 (As shown) and slides against the plug assembly 324. The groove 318 extends the entire length of the inner sleeve 316 from the first end 376 to the second end 378. The groove 318 is shaped and sized to receive the locking lever 360 (as shown). Figure 19 At least a portion of (as shown). The pin opening 320 extends through the inner sleeve 316 in a manner radially opposite to the groove 318. Unlike the groove 318, the pin openings 320 are discrete and longitudinally spaced apart within the inner sleeve 316. The pin openings 320 are shaped and sized to receive the slider 370 (as shown). Figure 19 At least a portion of (as shown). The circumferential slit 322 is circumferentially aligned with the pin opening 320 and is shaped and sized to at least partially receive the racks 358, 368 (as shown). Figure 19The top or bottom end portion (as shown). The circumferential slit 322 is circumferentially spaced from the groove 318 and the pin opening 320, such that the locking lever 360 and the slider 370 can slide against the inner surface 382 of the inner sleeve 316 during rotation. In the example, the first end portion 376 may include an annular recess 384 and / or a hole 386.

[0081] Figure 21 This is a perspective view of the key follower 328, the first rack 358, and the second rack 368. The key follower 328 includes a first rack engagement feature 388 configured to selectively engage with the first rack 358 at multiple different locations. In the example, the first rack engagement feature 388 is positioned relative to the longitudinal axis 306 (e.g., ...). Figure 18 The key follower 328 also includes a second rack engagement feature 390, configured to selectively engage with a second rack 368 at multiple different locations. In the example, the second rack engagement feature 390 is a post extending in a direction along the longitudinal axis 306 and is similar to the second rack engagement feature described above. Therefore, the first rack engagement feature 388 is different from the second rack engagement feature 390.

[0082] The first rack 358 includes a locking lever engagement groove 392 defined on one side and a first pin engagement feature 394 defined on the other side. The first pin engagement feature 394 is configured to selectively engage with the key follower 328 at multiple different locations. The first pin engagement feature 394 is configured to selectively engage with the first rack engagement feature 388 of the key follower 328. In the example, the first pin engagement feature 394 is a plurality of grooves on the side of the first rack 358. It may also include a groove 396 for changing the key and one or more tamper-evident notches 398. The second rack 368 has a second pin engagement feature 400, which is configured to selectively engage with the second rack engagement feature 390 of the key follower 328 and is similar to another example described above. The slider engagement feature 402 is configured to engage with the slider 370 (e.g., Figure 19 (As shown) This is a joint and also similar to another example described above. For example... Figure 21 As shown, the first rack 358 is different from the second rack 368, and the coupling connection between the first rack 358 and the key follower 328 is different from the coupling connection between the second rack 368 and the key follower 328. In other examples, the second rack 368 and the second pin engagement feature 400 may have a tooth / recess configuration as needed or desired. In still other examples, the coupling connection between the first rack 358 and the key follower 328 and the coupling connection between the second rack 368 and the key follower 328 may be the same.

[0083] Example

[0084] The following provides illustrative examples of the keyless lock cylinder disclosed herein. Implementations of the keyless lock cylinder may include any one or more of the examples described below, as well as any combination of the examples described below.

[0085] Example 1. A key-replaceable lock cylinder, the key-replaceable lock cylinder comprising:

[0086] A core that defines a longitudinal axis;

[0087] At least one pin, said at least one pin being slidably mounted on the core;

[0088] An inner sleeve, disposed within the core and selectively rotatable about the longitudinal axis, the inner sleeve defining a groove extending along the longitudinal axis and at least one pin opening; and

[0089] A plug assembly, the plug assembly being at least partially disposed within the inner sleeve and selectively rotatable about the longitudinal axis, the plug assembly comprising:

[0090] A plug body having a first side portion and an opposite second side portion;

[0091] At least one key follower, the at least one key follower being slidably mounted on the plug body;

[0092] A first support component subassembly is disposed on the first side portion of the plug body, and the first support component subassembly includes:

[0093] A first carrier member, which is selectively slidable along the longitudinal axis for key replacement between different user keys;

[0094] A locking lever, slidably mounted on the first carrier and selectively engaging with the groove of the inner sleeve to prevent rotation of the plug assembly relative to the inner sleeve; and

[0095] At least one first rack, the at least one first rack being connected between the at least one key follower and the locking lever to control the movement of the locking lever;

[0096] A second carrier subassembly is disposed on the second side of the plug body, and the second carrier subassembly includes:

[0097] A second carrier member, which can be selectively slidable along the longitudinal axis for key replacement between different master keys;

[0098] At least one slider is slidably mounted on the second support member, wherein, based on the position of the at least one slider within the second support member, the at least one pin is selectively capable of engaging the at least one pin opening of the inner sleeve to prevent rotation of the inner sleeve relative to the core; and

[0099] At least one second rack is connected between the at least one key follower and the at least one slider to control the movement of the at least one slider.

[0100] Example 2. A key-replaceable lock cylinder according to any one of Examples 1 to 16, further comprising at least one pin biasing member, wherein the at least one pin biasing member biases the at least one pin toward the at least one pin opening of the inner sleeve.

[0101] Example 3. A key-replaceable lock cylinder according to any one of Examples 1 to 16, wherein the at least one pin biasing member also biases the at least one slider inward relative to the second carrier.

[0102] Example 4. A lock cylinder with a replaceable key according to any one of Examples 1 to 16, wherein the at least one sliding member does not directly engage with a biasing member disposed within the second carrier.

[0103] Example 5. A lock cylinder with a replaceable key according to any one of Examples 1 to 16, wherein the cylinder includes a chimney-shaped portion that receives the at least one pin, the chimney-shaped portion projecting radially from the outer surface of the cylinder.

[0104] Example 6. A lock cylinder with a replaceable key according to any one of Examples 1 to 16, wherein the cylinder has an inner surface facing the inner sleeve, the inner surface having no longitudinally extending grooves.

[0105] Example 7. A key-replaceable lock cylinder according to any one of Examples 1 to 16, wherein the inner sleeve defines a plurality of circumferential slits.

[0106] Example 8. A lock cylinder with a replaceable key according to any one of Examples 1 to 16, wherein, when the at least one first rack is positioned by a master key, at least a portion of the at least one first rack extends at least partially within a slit in one of the plurality of circumferential slits.

[0107] Example 9. A key-replaceable lock cylinder according to any one of Examples 1 to 16, wherein when the at least one second rack is positioned in the key slot opening without a key, at least a portion of the at least one second rack extends at least partially within a slit of the plurality of circumferential slits.

[0108] Example 10. A lock cylinder with a replaceable key according to any one of Examples 1 to 16, wherein the at least one key follower includes a first rack engagement feature configured to engage the at least one first rack and a second rack engagement feature configured to engage the at least one second rack, wherein the first rack engagement feature is the same as the second rack engagement feature.

[0109] Example 11. A lock cylinder with a replaceable key according to any one of Examples 1 to 16, wherein the at least one key follower includes a first rack engagement feature configured to engage the at least one first rack and a second rack engagement feature configured to engage the at least one second rack, wherein the first rack engagement feature is different from the second rack engagement feature.

[0110] Example 12. A lock cylinder with a replaceable key according to any one of Examples 1 to 16, wherein the at least one first rack includes a first pin engagement feature configured to engage the at least one key follower, and the at least one second rack includes a second pin engagement feature configured to engage the at least one key follower, wherein the first pin engagement feature is the same as the second pin engagement feature.

[0111] Example 13. A lock cylinder with a replaceable key according to any one of Examples 1 to 16, wherein the at least one first rack includes a first pin engagement feature configured to engage the at least one key follower, and the at least one second rack includes a second pin engagement feature configured to engage the at least one key follower, wherein the first pin engagement feature is different from the second pin engagement feature.

[0112] Example 14. A lock cylinder with a replaceable key according to any one of Examples 1 to 16, wherein the at least one second rack includes a sliding engagement feature configured to engage with the at least one sliding member.

[0113] Example 15. A lock cylinder with a replaceable key according to any one of Examples 1 to 16, wherein the sliding engagement feature is a single protruding lug.

[0114] Example 16. A key-replaceable lock cylinder according to any one of Examples 1 to 16, wherein the plug assembly includes a plug surface extending from an end of the plug body, the plug surface defining a first key-replacement tool opening aligned with the first carrier and a second key-replacement tool opening aligned with the second carrier, the size or shape of the first key-replacement tool opening being different from the size or shape of the second key-replacement tool opening.

[0115] Example 17. A key-replaceable lock cylinder, the key-replaceable lock cylinder comprising:

[0116] Core component, the core component comprising:

[0117] Core, the core defining a longitudinal axis; and

[0118] At least one pin, said at least one pin being mounted on the core;

[0119] An inner sleeve disposed within the core, the inner sleeve defining a groove extending along the longitudinal axis and at least one pin opening for receiving at least a portion of the at least one pin, wherein the at least one pin is biased inward toward the inner sleeve and is selectively movable between an engaged position and a disengaged position, in which the inner sleeve is prevented from rotating relative to the core about the longitudinal axis, and in the disengaged position, the inner sleeve is allowed to rotate relative to the core about the longitudinal axis; and

[0120] A plug assembly, the plug assembly being at least partially disposed within the inner sleeve, the plug assembly comprising:

[0121] A plug body, wherein the plug body defines a keyway opening;

[0122] At least one key follower, the at least one key follower being slidably mounted on the plug body;

[0123] A first carrier subassembly has a locking lever and at least one first rack connected between the locking lever and the first first rack, wherein, when a valid user key is received in the key slot opening, the locking lever is selectively movable between a locked position and an unlocked position, wherein, in the locked position, the locking lever is at least partially disposed within the slot of the inner sleeve, thereby preventing the plug assembly from rotating relative to the inner sleeve about the longitudinal axis, wherein, in the unlocked position, the locking lever retracts from the slot of the inner sleeve, thereby allowing the plug assembly to rotate relative to the inner sleeve about the longitudinal axis, and wherein, the at least one first rack is selectively disengaged from the at least one key follower to allow key replacement between different user keys; and

[0124] The second carrier subassembly has at least one slider and at least one second rack, the at least one second rack being coupled between the at least one slider and the at least one second rack, wherein, when a valid master key is received in the key slot opening, the at least one slider is selectively movable between a blocked position and an unblocked position, wherein, in the blocked position, the at least one slider extends into the at least one pin opening of the inner sleeve, thereby pressing the at least one pin toward the disengaged position, wherein, in the unblocked position, the at least one slider retracts from the at least one pin opening of the inner sleeve, thereby allowing the at least one pin to move toward the engaged position, and wherein, the at least one second rack is selectively disengaged from the at least one key follower to allow key changing between different master keys.

[0125] Example 18. A key-replaceable lock cylinder according to any one of Examples 17 to 28, wherein, after receiving the valid user key, the at least one slider is in the unobstructed position, thereby allowing the plug assembly to rotate about the longitudinal axis, while the at least one pin is in the engaged position, thereby preventing the inner sleeve from rotating about the longitudinal axis.

[0126] Example 19. A lock cylinder with a replaceable key according to any one of Examples 17 to 28, wherein, upon receiving the valid user key, both the at least one first rack and the at least one second rack move together with the at least one key follower.

[0127] Example 20. A key-replaceable lock cylinder according to any one of Examples 17 to 28, wherein, upon receiving the valid master key, the at least one slider is in the blocking position, thereby allowing the inner sleeve and the plug assembly to rotate together about the longitudinal axis, while the at least one pin is in the disengaged position.

[0128] Example 21. A lock cylinder with a replaceable key according to any one of Examples 17 to 28, wherein, upon receiving the valid master key, both the at least one first rack and the at least one second rack move together with the at least one key follower.

[0129] Example 22. A lock cylinder with a replaceable key according to any one of Examples 17 to 28, wherein the at least one first rack is movable in a lateral direction relative to the longitudinal axis, and wherein the at least one first rack has an engaged position such that the end of the at least one first rack extends into the inner sleeve when the valid master key is in the key slot opening.

[0130] Example 23. A key-replaceable lock cylinder according to any one of Examples 17 to 28, wherein the at least one second rack is movable in a lateral direction relative to the longitudinal axis, and wherein the at least one second rack has an engaged position such that the end of the at least one second rack extends into the inner sleeve when no key is received in the key slot opening.

[0131] Example 24. A lock cylinder with a replaceable key according to any one of Examples 17 to 28, wherein the at least one pin is biased toward the engagement position.

[0132] Example 25. A key-replaceable lock cylinder according to any one of Examples 17 to 28, wherein the locking lever is biased toward the unlocked position.

[0133] Example 26. A key-replaceable lock cylinder according to any one of Examples 17 to 28, wherein the at least one slider is not directly biased.

[0134] Example 27. A key-replaceable lock cylinder according to any one of Examples 17 to 28, wherein the at least one first rack is different from the at least one second rack.

[0135] Example 28. A key-replaceable lock cylinder according to any one of Examples 17 to 28, wherein the at least one pin is biased toward the engaged position, and wherein the locking lever is biased toward the unlocked position, the biasing direction of the at least one pin and the biasing direction of the locking lever are in opposite directions.

[0136] Example 29. A method for assembling a key-replaceable lock cylinder, the method comprising:

[0137] A core assembly is provided, the core assembly having a core body defining a longitudinal axis and a chimney-shaped portion, the chimney-shaped portion accommodating at least one pin slidable within the chimney-shaped portion;

[0138] An inner sleeve is provided, the inner sleeve defining a groove extending along the longitudinal axis and at least one pin opening;

[0139] A plug assembly is provided, the plug assembly having a plug body and at least one key follower slidable within the plug body;

[0140] A first carrier subassembly is mounted to a first side of the plug body of the plug assembly. The first carrier subassembly includes: a first carrier member that is selectively slidable along the longitudinal axis for key replacement between different user keys; a locking lever that is slidably mounted on the first carrier member and selectively engages with the groove of the inner sleeve; and at least one first rack that is connected between the at least one key follower and the locking lever to control the movement of the locking lever.

[0141] A second carrier subassembly is mounted to a second side of the plug body of the plug assembly. The second carrier subassembly includes: a second carrier member that is selectively slidable along the longitudinal axis for key replacement between different master keys; at least one slider member slidably mounted on the second carrier member, wherein, based on the position of the at least one slider member within the second carrier member, the at least one pin is selectively engaged with at least one pin opening of the inner sleeve; and at least one second rack member connected between the at least one key follower and the at least one slider member to control the movement of the at least one slider member.

[0142] The plug assembly, including the first carrier subassembly and the second carrier subassembly, is at least partially inserted into the inner sleeve, wherein the plug assembly is selectively rotatable within the inner sleeve based on the position of the locking lever and the at least one sliding member; and

[0143] The inner sleeve with the plug assembly is at least partially inserted into the core, wherein the inner sleeve is selectively rotatable within the core based on the position of the at least one pin.

[0144] The various embodiments described above are provided by way of illustration only and should not be construed as limiting the scope of the appended claims. Those skilled in the art will readily recognize that various modifications and variations can be made without following the exemplary embodiments and applications illustrated and described herein, and without departing from the true spirit and scope of the appended claims.

Claims

1. A key-replaceable lock cylinder, the key-replaceable lock cylinder comprising: A core that defines a longitudinal axis; At least one pin, said at least one pin being slidably mounted on the core; An inner sleeve is disposed within the core and is selectively rotatable about the longitudinal axis, the inner sleeve defining a groove extending along the longitudinal axis and at least one pin opening. as well as A plug assembly, the plug assembly being at least partially disposed within the inner sleeve and selectively rotatable about the longitudinal axis, the plug assembly comprising: A plug body having a first side portion and an opposite second side portion; At least one key follower is slidably mounted on the plug body; A first support component subassembly is disposed on the first side portion of the plug body, and the first support component subassembly includes: A first carrier member, which is selectively slidable along the longitudinal axis for key replacement between different user keys; A locking lever, slidably mounted on the first carrier and selectively engaging with the groove of the inner sleeve to prevent rotation of the plug assembly relative to the inner sleeve; and At least one first rack, the at least one first rack being connected between the at least one key follower and the locking lever to control the movement of the locking lever; A second carrier subassembly is disposed on the second side of the plug body, and the second carrier subassembly includes: A second carrier member, which can be selectively slidable along the longitudinal axis for key replacement between different master keys; At least one slider is slidably mounted on the second support member, wherein, based on the position of the at least one slider within the second support member, the at least one pin is selectively capable of engaging the at least one pin opening of the inner sleeve to prevent rotation of the inner sleeve relative to the core; and At least one second rack is connected between the at least one key follower and the at least one slider to control the movement of the at least one slider.

2. The key-replaceable lock cylinder according to claim 1, wherein, It also includes at least one pin biasing member, wherein the at least one pin biasing member biases the at least one pin toward the at least one pin opening of the inner sleeve.

3. The key-replaceable lock cylinder according to claim 2, wherein, The at least one pin biasing member also biases the at least one sliding member inward relative to the second carrier member.

4. The key-replaceable lock cylinder according to claim 2, wherein, The at least one sliding member does not directly engage with the biasing member disposed within the second bearing member.

5. The key-replaceable lock cylinder according to claim 1, wherein, The core includes a chimney-shaped portion that accommodates the at least one pin, the chimney-shaped portion protruding radially from the outer surface of the core.

6. The key-replaceable lock cylinder according to claim 1, wherein, The core has an inner surface facing the inner sleeve, and the inner surface does not have longitudinally extending grooves.

7. The key-replaceable lock cylinder according to claim 1, wherein, The inner sleeve defines a plurality of circumferential slits.

8. The key-replaceable lock cylinder according to claim 7, wherein, When the at least one first rack is positioned by the master key, at least a portion of the at least one first rack extends at least partially within the slits of the plurality of circumferential slits.

9. The key-replaceable lock cylinder according to claim 7, wherein, When the at least one second rack is positioned in the key slot opening without a key, at least a portion of the at least one second rack extends at least partially within the slits of the plurality of circumferential slits.

10. The key-replaceable lock cylinder according to claim 1, wherein, The at least one key follower includes a first rack engagement feature configured to engage the at least one first rack and a second rack engagement feature configured to engage the at least one second rack, wherein the first rack engagement feature is the same as the second rack engagement feature.

11. The key-replaceable lock cylinder according to claim 1, wherein, The at least one key follower includes a first rack engagement feature configured to engage the at least one first rack and a second rack engagement feature configured to engage the at least one second rack, wherein the first rack engagement feature is different from the second rack engagement feature.

12. The key-replaceable lock cylinder according to claim 1, wherein, The at least one first rack includes a first pin engagement feature configured to engage the at least one key follower, and the at least one second rack includes a second pin engagement feature configured to engage the at least one key follower, wherein the first pin engagement feature is the same as the second pin engagement feature.

13. The key-replaceable lock cylinder according to claim 1, wherein, The at least one first rack includes a first pin engagement feature configured to engage the at least one key follower, and the at least one second rack includes a second pin engagement feature configured to engage the at least one key follower, wherein the first pin engagement feature is different from the second pin engagement feature.

14. The key-replaceable lock cylinder according to claim 1, wherein, The at least one second rack includes a sliding engagement feature configured to engage with the at least one sliding member.

15. The key-replaceable lock cylinder according to claim 14, wherein, The sliding engagement feature is a single protruding lug.

16. The key-replaceable lock cylinder according to claim 1, wherein, The plug assembly includes a plug surface extending from an end of the plug body, the plug surface defining a first key change tool opening aligned with the first carrier and a second key change tool opening aligned with the second carrier, the size or shape of the first key change tool opening being different from the size or shape of the second key change tool opening.

17. A key-replaceable lock cylinder, the key-replaceable lock cylinder comprising: Core component, the core component comprising: Core, the core defining a longitudinal axis; and At least one pin, said at least one pin being mounted on the core; An inner sleeve disposed within the core, the inner sleeve defining a groove extending along the longitudinal axis and at least one pin opening for receiving at least a portion of the at least one pin, wherein the at least one pin is biased inward toward the inner sleeve and is selectively movable between an engaged position and a disengaged position, in which the inner sleeve is prevented from rotating relative to the core about the longitudinal axis, and in the disengaged position, the inner sleeve is allowed to rotate relative to the core about the longitudinal axis; and A plug assembly, the plug assembly being at least partially disposed within the inner sleeve, the plug assembly comprising: A plug body, wherein the plug body defines a keyway opening; At least one key follower, the at least one key follower being slidably mounted on the plug body; A first carrier subassembly has a locking lever and at least one first rack connected between the locking lever and the first first rack, wherein, when a valid user key is received in the key slot opening, the locking lever is selectively movable between a locked position and an unlocked position, wherein, in the locked position, the locking lever is at least partially disposed within the slot of the inner sleeve, thereby preventing the plug assembly from rotating relative to the inner sleeve about the longitudinal axis, wherein, in the unlocked position, the locking lever retracts from the slot of the inner sleeve, thereby allowing the plug assembly to rotate relative to the inner sleeve about the longitudinal axis, and wherein, the at least one first rack is selectively disengaged from the at least one key follower to allow key replacement between different user keys; and The second carrier subassembly has at least one slider and at least one second rack, the at least one second rack being coupled between the at least one slider and the at least one second rack, wherein, when a valid master key is received in the key slot opening, the at least one slider is selectively movable between a blocked position and an unblocked position, wherein, in the blocked position, the at least one slider extends into the at least one pin opening of the inner sleeve, thereby pressing the at least one pin toward the disengaged position, wherein, in the unblocked position, the at least one slider retracts from the at least one pin opening of the inner sleeve, thereby allowing the at least one pin to move toward the engaged position, and wherein, the at least one second rack is selectively disengaged from the at least one key follower to allow key changing between different master keys.

18. The key-replaceable lock cylinder according to claim 17, wherein, Upon receiving the valid user key, the at least one slider is in the unobstructed position, thereby allowing the plug assembly to rotate about the longitudinal axis, while the at least one pin is in the engaged position, thereby preventing the inner sleeve from rotating about the longitudinal axis.

19. The key-replaceable lock cylinder according to claim 17, wherein, Upon receiving the valid user key, both the at least one first rack and the at least one second rack move together with the at least one key follower.

20. The key-replaceable lock cylinder according to claim 17, wherein, Upon receiving the valid master key, the at least one slider is in the blocking position, thereby allowing the inner sleeve and the plug assembly to rotate together about the longitudinal axis, while the at least one pin is in the disengaged position.

21. The key-replaceable lock cylinder according to claim 17, wherein, Upon receiving the valid master key, both the at least one first rack and the at least one second rack move together with the at least one key follower.

22. The key-replaceable lock cylinder according to claim 17, wherein, The at least one first rack is movable in a lateral direction relative to the longitudinal axis, and wherein the at least one first rack has an engaged position such that the end of the at least one first rack extends into the inner sleeve when the valid master key is in the key slot opening.

23. The key-replaceable lock cylinder according to claim 17, wherein, The at least one second rack is movable in a transverse direction relative to the longitudinal axis, and wherein the at least one second rack has an engaged position such that the end of the at least one second rack extends into the inner sleeve when no key is received in the key slot opening.

24. The key-replaceable lock cylinder according to claim 17, wherein, The at least one pin is biased toward the engagement position.

25. The key-replaceable lock cylinder according to claim 17, wherein, The locking lever is biased toward the unlocked position.

26. The key-replaceable lock cylinder according to claim 17, wherein, The at least one slider is not directly biased.

27. The key-replaceable lock cylinder according to claim 17, wherein, The at least one first rack is different from the at least one second rack.

28. The key-replaceable lock cylinder according to claim 17, wherein, The at least one pin is biased toward the engagement position, and the locking lever is biased toward the unlock position, wherein the biasing direction of the at least one pin and the biasing direction of the locking lever are in opposite directions.

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