Patent Application
20150240525
Interchangeable lock cylinders, such as, for example, interchangeable core (IC) cylinders, often employ pin tumbler lock mechanisms. Pin tumbler lock mechanisms typically utilize the alignment and misalignment of tumbler pins to control both the operation of an associated lock device and the ability to remove the IC cylinder from a lock housing. For example, with at least certain types of pin tumbler lock mechanisms, in the absence of a valid key being inserted into a key slot of an IC cylinder, tumbler pins typically are biased to be misaligned with, or extend across, both a control shear line and an operating shear line.
When tumbler pins are misaligned with the operating shear line, a plug body of the IC cylinder is typically unable to rotate within the IC cylinder. As the plug body is often operably connected to the lock device, such as, for example, a deadbolt, the inability to rotate the plug body typically results in the inability to displace the lock device from a locked position to an unlocked position, and/or vice versa. Thus, typically in order to lock/unlock the lock device, a first key, such as, for example, an operating key, having the appropriate bitting configuration is placed within a key slot of the plug body. When properly inserted into the key slot, the bittings of the operating key engage and displace tumbler pins to positions in which tumbler pins that are adjacent to the operating shear line, such as, for example, bottom pins, do not extend across the operating shear line while other pins, such as top pins, remain misaligned with the control shear line. With tumbler pins properly aligned with the operating shear line, the plug body may be rotated independently of a control lug of the IC cylinder. Such rotation of the plug body, and associated inability to rotate the control lug, may allow for the displacement of the lock device while prohibiting the removal of the IC cylinder from the lock housing.
Similarly, when tumbler pins, such as top pins, do not extend across the control shear line, the control lug is typically able to rotate within the IC cylinder. The rotational displacement of the control lug is often necessary to displace a retention portion of the control lug from a recess in the lock housing before the IC cylinder may be removed from the lock housing. Thus, the removal of the IC cylinder from the lock housing typically involves the insertion of a second key, such as, for example, a control key, that has an appropriate key bitting configuration to be used in displacing the tumbler pins that are adjacent to the control shear line. Moreover, the bitting of the control key is typically configured so that, when the control key is inserted into the key slot, the top pins are aligned with and/or do not extend across the control shear line. With tumbler pins properly aligned with the control shear line, the control lug may be rotated, which may thereby displace the retention portion so that the IC cylinder may be removed from the lock housing. During such uses of the control key, tumbler pins may continue to be misaligned with the operating shear line, thereby preventing the plug body from being rotated independently of the control lug.
With traditional pin tumbler lock mechanisms, there are a finite number of possible bitting combinations. For example, the possible number of bitting combinations may be defined by the number of bittings in a key system raised to the power of the number of pin chambers in the IC cylinder. For example, if a bitting system uses ten different cuts for the blade of a key, and the IC cylinder has six chambers or collections of tumbler pins, then the number of possible bitting combinations is ten to the sixth power. However, in application, the number of bitting combinations actually used is often less than the number of possible bitting combinations. For example, the number of bitting combinations actually used may be reduced due to manufacturing, mechanical, and/or security concerns, including issues related to reducing the potential for cross keying, phantom master keys, and/or phantom control keys. The number of usable bitting combinations is often further reduced in order to accommodate the ability for each cylinder to have a pin configuration that allows for tumbler pins to align with operating shear line during certain uses and the control shear line during other uses. Additionally, lock mechanisms designed to that actuate the control lug off of the position of top pins are generally limited to using traditional tumbler pin systems. Further, the use of different bitting configurations for aligning tumbler pins to both control activation of the lock device and/or removal of the IC cylinder is not necessarily compatible with certain types of interchangeable lock cylinders.
One aspect of the present invention is a retention mechanism for retaining a lock cylinder in a lock housing. The retention mechanism may include a control lug having a chamber. Further, the control lug is configured for rotational displacement between a disengaged position and an engaged position in the lock cylinder. The retention mechanism may also include a control pin, at least a portion of the control pin being configured to be displaced into the chamber to prevent rotational displacement of the control lug from the engaged position. Additionally, the retention mechanism may include a finger pin that has an activation surface. The finger pin is configured for displacement between a rest position and an activation position. Further, the activation surface is configured to removably displace at least a portion of the control pin from the chamber when the finger pin is displaced to the activation position.
Another aspect of the present invention is an interchangeable lock cylinder that is configured for securable placement in a lock housing. The interchangeable lock cylinder includes a shell body having an aperture and a plug body that is configured for rotational displacement about the aperture. The plug body includes a key slot. The interchangeable lock cylinder also includes a retention mechanism having a control lug, a finger pin, and a control pin. The control lug includes a chamber and an orifice, the orifice being configured to receive the rotatable insertion of the plug body. Further, the control pin is configured for removable insertion into the chamber when the control lug is rotatably displaced to an engaged position. Additionally, the finger pin is configured to displace the control pin from the chamber.
Another aspect of the present invention is an interchangeable lock cylinder system that includes a plug body having a key slot and a retention mechanism. The retention mechanism includes a control lug, a finger pin, and a control pin. The control lug has a chamber and an orifice, the orifice being configured to receive the rotatable insertion of the plug body. Additionally, the control pin is configured for removable insertion into the chamber when the control lug is rotatably displaced to an engaged position. The interchangeable lock cylinder system also includes a key having a sidebit, the key being configured to be inserted into the key slot. The sidebit is configured to displace the finger pin from a rest position to an activation position. Further, the finger pin is configured to removably displace the control pin from the chamber when the finger pin is in the activation position.
The foregoing summary, as well as the following detailed description of certain embodiments of the present invention, will be better understood when read in conjunction with the appended drawings. For the purpose of illustrating the invention, there is shown in the drawings, certain embodiments. It should be understood, however, that the present invention is not limited to the arrangements and instrumentalities shown in the attached drawings.
Referencing
The lower portion 18 of the lock cylinder 10 includes an aperture 28 that is configured to receive the insertion of a plug body 30. The plug body 30 is configured for rotational displacement within the aperture 28. Additionally, according to certain embodiments, the plug body 30 is configured for rotational displacement about the orifice 25 of the control lug 22. The plug body 30 includes a first end 31 and a second end 33. Optionally, according to certain embodiments, the first end 31 of the plug body 30 may be larger than the aperture 28 so as to prevent the first end 31 from being displaced into the aperture 28. Additionally, the second end 33 may be configured to be operably connected to a plug disk 35. According to certain embodiments, the plug disk 35 may be operably connected to a lock device. According to such a configuration, the rotational displacement of the plug body 30, and associated displacement of the plug disk 35, may be translated into the displacement of at least a portion of the lock device, such as, for example, the displacement of a dead bolt from a locked position to an unlocked position, and/or vice versa. Additionally, the plug disk 35 may at least assist in retaining the plug body 30 in the aperture 28.
As shown in at least
According to certain embodiments, the lock cylinder 10 may also include a cover 44 that is configured to at least assist in retaining the retention pins 36 within the cavities 34 when the plug body 30 is removed from the aperture 28 of the shell body 14. More specifically, when the plug body 30 is removed from the aperture 28, the cover 44 may be in a closed position such that at least a portion of the cover 44 is positioned over at least a portion of the cavities 34, thereby preventing the release of the retention pins 36 from the cavities 34. Further, when the plug body 30 is positioned within the aperture 28, the cover 44 may be rotated to an open position, in which the cover 44 does not cover or otherwise provide a barrier over the cavities 34, thereby allowing at least a portion of the retention pins 36 to extend out of the cavities 34.
Referencing
The rotational displacement of the control lug 22 from the disengaged position to the engaged position, and associated displacement of the retention portion 26, may be achieved in a variety of different manners. For example, according to certain embodiments, the recess 40 of the control lug 22 may be offset from the control bar 38 when the lock cylinder 10 is at least initially positioned within the lock housing 11. Subsequent rotational displacement of the plug body 30, such as, for example, insertion and rotation of an appropriate key 12 in the key slot 32 may rotably displace the plug body 30, thereby at least also rotably displacing the control bar 38. Thus, the control bar 38 may be rotated to a position in which the control bar 38 is received into the recess 40 of the control lug 22. With at least a portion of the control bar 38 positioned within the recess 40 of the control lug 22, the direction of rotation of the key 12 may be reversed, thereby causing the control lug 22 to be rotated with the plug body 30. According to certain embodiments, as the control lug 22 is rotated from the disengaged position to the engaged position, at least a portion of the retention portion 26 of the control lug 22 enters into the retention recess 13 of the lock housing 11. The control lug 22 may continue to be rotated until the control lug 22 reaches the engaged position, wherein the retention portion 26 is positioned within and/or engages the retention recess 13 in a manner that prevents the lock cylinder 10 from being removed from the lock housing 11.
Embodiments of the present invention further include a retention mechanism 46 that is configured to at least in controlling the displacement of the control lug 22 from the engaged position to the disengaged position, and thus generally control the ability to remove of the lock cylinder 10 from the lock housing 11. According to certain embodiments, the retention mechanism 46 includes the control lug 22, a finger pin 48, and a control pin 50. When the retention mechanism 46 is in the retention position, the control pin 50 is positioned within a chamber 52 of the control lug 22 so as to retain the control lug 22 in the engaged position. According to certain embodiments, the chamber 52 may be configured to receive the insertion of at least a portion of the control pin 50 as the control lug 22 is rotated from the disengaged position and toward the engaged position and/or upon the control lug 22 reaching the engaged position.
Referencing
Additionally, according to certain embodiments, the engagement surface 64 may generally extend to the intermediate portion 62 of the control pin 50. The intermediate portion 62 may have a variety of different shapes and sizes. For example, according to the illustrated embodiment, the intermediate portion 62 may have a generally cylindrical configuration that is sized for lateral displacement along an orifice 66 of the shell body 14, as shown, for example, in
When the control lug 22 is in the disengaged position, the first end 54 of the control pin 50 may be biased against a front surface 56 of the control lug 22. As the control lug 22 is rotated toward and/or reaches the engaged position, the chamber 52 may be moved to a position adjacent to the control pin 50. With the chamber 52 adjacent to the control pin 50, the biasing element 58 may force the control pin 50 to move from a recessed position, wherein at least a substantial portion of the control pin 50 may be housed in the orifice 66, toward an extended position, wherein at least a portion of the control pin 50 is positioned in the chamber 52, as shown, for example in
With the control log 22 in the engaged position and at least a portion of the control pin 50 in the chamber 52, the control pin 50 may provide a barrier that prohibits the rotation of the control lug 22 back to the disengaged position. More specifically, at least the presence of the control pin 50 in the chamber 52 may prevent the control plug 22 from being rotated to a position in which the retention portion 26 of the control lug 22 would vacate the retention recess 13 of the lock housing 11. With the control lug 22 in the engaged position, and the associated retention mechanism 46 in the retention position, the lock cylinder 10 may not be removable from the lock housing 11.
The subsequent removal of the control pin 50 from the chamber 52 of the control lug 22 may be achieved through the displacement of the finger pin 48 from a rest position to an activation position. Referencing
At least a portion of the shaft 48 is configured for slidable displacement within a passageway 78 in the plug body 30, as shown, for example, in
According to the illustrated embodiment, the base portion 74 includes an extension 82 having generally opposing first and second surfaces 84, 86. The extension 82 is configured to be positioned within an inner area 88 of the plug body 30, as shown, for example, in
Referencing
However, when the finger pin 48 is displaced from the rest position to the activation position, as shown for example in at least
Additionally, according to certain embodiments, as the control lug 22 is rotably displaced toward the disengaged position, a wall 53 of the control lug 22 may also slidingly engage a portion of the engagement surface 64 of the control pin 50, thereby assisting in displacing the control pin 50 further into the orifice 66 and back toward the recessed position, until the control pin 50 is misaligned with the chamber 52 and instead returns to being biased against an adjacent front surface 56 of the control lug 22.
Referencing
The distance that the finger pin 48 is displaced as the inclined surface 98 is displaced along the transitional surface 94 and/or the contact portion 98 travels along the sidebit surface 104 may determine whether the finger pin 48 is displaced to the activation position, and thus whether the associated retention mechanism 46 may allow the control lug 22 to be rotated to the disengaged position. For example,
Referencing
Further, according to certain embodiments, the second key 12b may have a bitting configuration on the top surface 95 of the second key 12b that does not displace retention pins 36 to positions that would permit the plug body 30 to be rotated independently of the control lug 22. According to such embodiments, the plug body 30 and control lug 22 may be rotated together with the finger pin 48 remaining in the activation position. More specifically, the finger pin 48 may remain in the chamber 52 as the plug body 30 and control lug 22 are rotated together toward the disengage position of the control lug 22.
While the invention has been described with reference to certain embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
