The present invention relates to a wafer-tumbler lock, and more particularly to a rekeyable wafer-tumbler lock with facially engageable wafer tumblers.
Most common locks are pin-tumbler cylinder locks or wafer tumbler cylinder locks. Each of these locks contains a cylinder or plug which rotates within a housing or shell. In the pin-tumbler locks, pin holes containing top and bottom pin tumblers extend transversely through both the cylinder and the housing crossing a shear line, which is the boundary between the cylinder and the housing. The pin tumblers slide up and down within the pin holes defining a locked position and an unlocked position. When a pin tumbler crosses the shear line, the pin tumbler interferes with the rotation of the cylinder and the cylinder remains locked. When the correct key is inserted in the lock, the biting on the key contacts the pin tumblers and locates the pins within their pin holes such that no pin crosses the shear line. The cylinder can then rotate within the housing when a torque is applied by the key to unlock the lock.
Wafer-tumbler locks have wafer-shaped tumblers which slide up and down within channels that extend from the cylinder to the housing. The wafer tumblers are spring loaded so that they can extend out of the cylinder and into a locking slot within the housing, to prevent rotation of the cylinder relative to the housing in a locked condition. The center of each of the wafer tumblers has an opening for receiving a key. The correct key moves the wafer tumblers out of the locking slot, such that torque applied to the cylinder rotates the cylinder within the housing and unlocks of the lock.
To avoid or reduce the costs of re-keying locks, several types of re-keyable locks that do not require disassembly have been developed for pin-tumbler locks. However, uncomplicated and cost effective re-keyable locks for wafer tumbler systems are still relatively uncommon.
Accordingly, it is desirable to provide an inexpensive re-keyable wafer-tumbler lock assembly.
The re-keyable lock cylinder according to the present invention provides a re-keyable lock cylinder will learn a new key while obsolescing old keys without disassembly thereof. According to the present invention, a re-keyable lock cylinder comprises a cylinder body with a longitudinal axis and a plug assembly disposed in the cylinder body. The plug assembly includes a plug body and a carrier sub-assembly disposed adjacent the plug body. The plug assembly further includes a plurality of planar wafers. The carrier sub-assembly is moveable parallel to the longitudinal axis of the cylinder body and includes a plurality of racks for engaging the wafers in a face-to-face teeth arrangement. The racks disengage from the wafers to separate the teeth in response to movement of the carrier in a first direction and engage the teeth in response to movement of the carrier in a second direction. The lock cylinder is in a re-keyable condition when the racks are disengaged from the wafers.
The present invention further includes a novel method of re-keying the re-keyable lock cylinder. According to the invention, a method of re-keying the cylinder includes providing a lock cylinder with a plug body and a lock face having a keyway and a tool-receiving aperture, inserting a first valid key in the keyway, rotating the plug body to a first position, inserting a tool in the tool-receiving aperture, removing the first valid key from the keyway, inserting a second valid key in the keyway, and rotating the plug body away from the first position. The step of inserting the tool includes the step of moving each rack out of engagement with each wafer such that the rack teeth become repositioned on the wafer teeth in response to the second valid key.
The present invention therefore provides an inexpensive re-keyable wafer-tumbler lock assembly.
The various features and advantages of this invention will become apparent to those skilled in the art from the following detailed description of the currently preferred embodiment. The drawings that accompany the detailed description can be briefly described as follows:
Referring to
The plug assembly 14 includes a plug body 40 (FIGS. 4A-4F), a carrier sub-assembly 42 (
The drive portion 50 (
The carrier sub-assembly 42 includes a carrier 90 (FIGS. 5A-5E), a plurality of racks 92 (FIGS. 8A-8B), a spring catch 96 (FIGS. 9A-9B), a spring-loaded locking bar 94 (FIGS. 10A-10B), and a return spring 98. The carrier 90 includes a body 100 in the form of a cylinder section that is complementary to the main portion 70 of the plug body 40, such that the carrier 90 and the main portion 70 combine to form a cylinder that fits inside the lock cylinder body 12. The carrier 90 includes a curved surface 102 and a flat surface 104. The curved surface 102 includes a locking bar recess 106 and a spring catch recess 108.
The locking bar recess 106 further includes a pair of return spring-receiving bores 109 (
Each spring-loaded wafer assembly 38 includes a wafer 113 and a biasing spring 115. The wafer 113 provides a spring pocket 116 (
The racks 92 (
The spring-loaded locking bar 94 (
The spring-retaining cap 82 includes a curvilinear portion 140 having an upper surface 142 and a lower surface 144 (FIGS. 7A-7D). The thickness of the curvilinear portion 140 preferably allows the curvilinear portion 14 to fit in the recess 80 with the upper surface 142 flush with the intermediate portion 46 of the plug body 40. A plurality of spring alignment tips 146 extend from the lower surface 144 to engage the springs 115. In addition, a pair of cap retaining tips 152 extend from the lower surface 144 to engage alignment openings 154 formed in the plug body 40.
Referring to
Referring to
Referring to
The internal configuration of a lock cylinder 10 with the valid key 160 inserted therein at the home position permits the locking bar 94 to be free to cam out of the groove 29 in the cylinder body 12 (FIG. 13). The bits of the valid key 160 lift the wafers 113 in the channels 74 and thereby re-position the racks 92 in the slots 103. When repositioned, the racks 92 are disposed to align the locking grooves 132 with the extended gear teeth 136 on the locking bar 94. The locking bar 94 is free to cam out of the groove 29 when the valid key 160 is rotated. At the same time, the bullet-shaped features 78 are aligned with the semi-circular grooves 111 in the racks 92 (FIG. 5), allowing the racks 92, and the carrier 90, to move parallel to the longitudinal axis of the lock cylinder 10.
Referring to
Referring to
With the spring catch 96 disposed in the first detent recess 30, the racks 92 are longitudinally disengaged from the wafers 113 parallel to axis 11 (FIG. 20). That is, the rack teeth 122 are displaced longitudinally parallel to axis 11 such that the rack teeth 122 do not contact the wafer teeth 114. The valid key 160 is removed and a second valid key is inserted and rotated clockwise to release the spring catch 96. As the spring catch 96 leaves the first detent recess 30, the carrier 90 is driven toward the plug face 44 by the return spring 98, causing the racks 92 to re-engage the wafer teeth 114 of the wafers 113 at different positions based on the bits of the second valid key (FIG. 21). At this point, the lock cylinder 10 is keyed to the second valid key and the first valid key 160 no longer operates the lock cylinder 10.
Although particular step sequences are shown, described, and claimed, it should be understood that steps may be performed in any order, separated or combined unless otherwise indicated and will still benefit from the present invention.
The foregoing description is exemplary rather than defined by the limitations within. Many modifications and variations of the present invention are possible in light of the above teachings. The preferred embodiments of this invention have been disclosed, however, one of ordinary skill in the art would recognize that certain modifications would come within the scope of this invention. It is, therefore, to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described. For that reason the following claims should be studied to determine the true scope and content of this invention.
The present invention is a continuation-in-part of U.S. patent application Ser. No. 10/256,066, filed Sep. 26, 2002, now U.S. Pat. No. 6,860,131.
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Number | Date | Country | |
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Parent | 10256066 | Sep 2002 | US |
Child | 10888454 | US |