Ceramic spine security cable

Abstract

A cable lock including a lock body having a locking mechanism with a locked state and an unlocked state. A ceramic body cable includes a plurality of nested ceramic bodies and a cord, wherein each one of the plurality of ceramic bodies includes a center portion having an aperture. Each aperture of the plurality of nested ceramic bodies forms a channel through which the cord is positioned. Each of the ceramic bodies also includes a projection and a space such that the projection of one of the ceramic bodies overlaps the space of an adjacent ceramic body. A mesh sleeve is positioned on an exterior of the ceramic body cable and a shrunken heat shrinkable tube is positioned over the mesh sleeve. The combined ceramic body cable, mesh sleeve, and shrunken heat shrinkable tube are coupled to the lock body.

Claims

1. A cable lock, comprising: a lock body including a locking mechanism having a locked state and an unlocked state; a plurality of segments, each including a center portion defining an aperture and a plurality of projections extending from the center portion, wherein the plurality of segments are located adjacent one another, and wherein the plurality of projections of one of the plurality of segments overlaps the center portion of each of two adjacently-located ones of the plurality of segments; and a cord extending through the aperture of each of the plurality of segments and operatively connected to the lock body.

2. The cable lock of claim 1, wherein each of the plurality of segments is formed of a ceramic material.

3. The cable lock of claim 2, wherein the ceramic material is a ceramic composite.

4. The cable lock of claim 1, wherein the center portion of each of the plurality of segments comprises a ring.

5. The cable lock of claim 1, wherein each of the plurality of projections comprises a disc.

6. The cable lock of claim 5, wherein each disc defines a diameter that is greater than a height of the center portion.

7. The cable lock of claim 1, wherein each of the plurality of projections comprises a fin.

8. The cable lock of claim 7, wherein each fin has a height greater than a height of the center portion.

9. The cable lock of claim 1, further comprising a heat shrinkable tube, wherein the plurality of segments are located in the heat shrinkable tube.

10. A lock apparatus, comprising: a lock body including a locking mechanism having a locked state and an unlocked state; a plurality of overlapping segment members, each comprising: a bearing portion including an aperture; and an overlap portion extending from the bearing portion; and a cord threaded through the apertures and connected to the lock body; wherein for each of the segment members: the segment member is positioned adjacent an adjacent segment member; the overlap portion of the segment member overlaps the bearing portion of the adjacent segment member; and the bearing portion of the segment member is overlapped by the overlap portion of the adjacent segment member.

11. The lock apparatus of claim 10, wherein each of the plurality of overlapping segment members comprises a ceramic material.

12. The lock apparatus of claim 11, wherein the ceramic material is a ceramic composite.

13. The lock apparatus of claim 10, wherein each bearing portion is substantially annular.

14. The lock apparatus of claim 10, wherein each overlap portion comprises a plurality of angularly-spaced fins or a plurality of angularly-spaced discs.

15. The lock apparatus of claim 10, wherein for one or more of the plurality of overlapping segment members: the segment member is further positioned adjacent a second adjacent segment member such that the segment member is positioned between the adjacent segment member and the second adjacent segment member; the overlap portion of the segment member overlaps the bearing portion of the second adjacent segment member; and the bearing portion of the segment member is overlapped by the overlap portion of the second adjacent segment member.

16. A method of forming a cable lock, the method comprising: forming a cable having a first end and an opposite second end, wherein forming the cable comprises threading a cord through a plurality of segment members, and wherein each of the plurality of segment members is positioned adjacent an adjacent segment member that partially overlaps the segment member and is partially overlapped by the segment member; and coupling the first end of the cable to a lock body including a lock mechanism having a locked state and an unlocked state, wherein the lock mechanism is operable to selectively retain the second end of the cable within the lock body.

17. The method of claim 16, wherein each of the plurality of segment members comprises a body portion and a plurality of projections, wherein the body portion of each of the plurality of segment members is overlapped by the projections of the adjacent segment member, and wherein the projections of each of the plurality of segment members overlap the body portion of the adjacent segment member.

18. The method of claim 16, wherein each of the plurality of segment members is formed of a ceramic material.

19. The method of claim 18, wherein the ceramic material is a ceramic matrix.

20. The method of claim 16, wherein forming the cable further comprises attaching a collar to the cord to at least partially define the second end of the cable.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a perspective view of a bicycle secured to a bicycle rack with a cable lock.

(2) FIG. 2 is a plan view of a cable lock including a lock housing and a cable releasably coupled to the lock housing.

(3) FIG. 3 is a perspective view of a ceramic segment.

(4) FIG. 4 is a perspective view of a plurality of the nested ceramic segment of FIG. 3.

(5) FIG. 5 is a cross-sectional view of a few of the plurality of the nested ceramic segments of FIG. 4.

(6) FIG. 6 is a perspective view of another ceramic segment.

(7) FIG. 7 is a perspective view of a plurality of the nested ceramic segments of FIG. 6.

(8) FIG. 8 is a cross-sectional view of a few of the plurality of nested ceramic segments of FIG. 7.

(9) FIG. 9 is a perspective view of another ceramic segment.

(10) FIG. 10 is a perspective view of a plurality of the nested ceramic segments of FIG. 9.

(11) FIG. 11 is a cross-sectional view of a few of the plurality of nested ceramic segments of FIG. 10.

(12) FIG. 12 is a plan view of a cable of a cable lock illustrating the segments of FIG. 9.

(13) FIG. 13 is a plan view of a crimped end of a cable of a cable lock.

(14) FIG. 14 is a plan view of a sleeve covering the cable of FIG. 12.

(15) FIG. 15 is a plan view of a shrinkable tube covering the sleeve of FIG. 14.

(16) FIG. 16 is a plan view of the shrinkable tube of FIG. 15 after being shrunk around the cable of FIG. 12.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

(17) For the purposes of promoting an understanding of the principles of the invention, reference will now be made to the embodiments illustrated in the drawings where specific language is used to describe the same. It should be understood that no limitation of the scope of the invention is thereby intended. Any alterations and further modifications in the described embodiments, and any further applications of the principles of the invention as described herein are contemplated as would normally occur to one skilled in the art to which the invention relates.

(18) FIG. 1 illustrates a perspective view of a bicycle 2 having wheels 4 supported by a frame 6. The bicycle frame 6 is secured to a bicycle rack 8 with a cable lock 10. The cable lock 10 includes a lock head 12 coupled to a lock cable 14. To lock the bicycle 2 to the rack 8, the lock cable 14 is wrapped around the rack 8 and the frame 6 to secure the frame 6 to the rack 8. While locking the frame 6 to the rack 8 is illustrated in the figures, the illustrated method of securing the bicycle is only one possibility. The user of the bicycle 2 generally determines the best method of locking and many other methods are used and known. In addition, more than one lock can be used and locks of the same type or different types are often utilized.

(19) FIG. 2 illustrates a plan view of the cable lock 10 including the lock head 12 coupled to the lock cable 14. The lock cable 14 includes a first end 16 fixedly coupled to the lock head 12 and a second end 18 releasably coupled to the lock head 12. The first end 16 is fixedly connected to a collar 17 which is part of the lock head 12. The second end 18 is inserted into a lock housing 20 and held securely to the lock head 12 when locked by a lock mechanism (not shown). An end 22 of the lock head 12 includes a keyhole (not shown) configured to receive a key for locking and unlocking the lock mechanism. In other embodiments, the lock head 12 includes a combination lock. In different embodiments, the combination lock includes a rotating dial, rotating discs, an electronic keypad or a mechanical keypad, as is understood by those skilled in the art. In still other embodiments, the lock head includes an electronic lock responsive to a key fob. The second end 18 of the lock cable 14 includes a collar 24 which holds a locking pin, not shown. The locking pin is inserted into the lock mechanism and held securely to the lock head 12 when the lock is locked. In the unlocked condition, the locking pin is removed from the lock mechanism to free the second end 18 of the lock cable 14 from the housing 20.

(20) The lock cable 14 includes a plurality of segments or bodies located on a cord or rope which is placed through each of the plurality of segments. FIG. 3 illustrates one embodiment of a segment 30 which includes a bore 32 through which the rope is located. The segment 30 includes a band or ring 34, also called a center portion, having a circular inner surface 36. In different embodiments, the band 34 is a circular band or other shapes. The ring further includes an outer surface 38 which is curved from top to bottom from which extends a plurality of projections 40.

(21) As disclosed herein the segments are formed of relatively hard material including a ceramic material. The ceramic material includes, but is not limited to, a crystalline or non-crystalline material, such as silicon carbide, boron oxide, silicon nitride, born carbide, and tungsten carbide-cobalt. In addition, the segments, in different embodiments, are formed of composite materials having a ceramic matrix, such as embedded ceramic fibers.

(22) Each of the plurality of projections 40 is generally disc shaped and includes a diameter 42 having a length greater than a height 44 of the ring 34. The projections 40 are centrally located along the ring 34 such that a portion of the projection 40 extends above the ring 34 and a portion of the projection 40 extends below the ring 34. The projection 40 also includes a convex surface 46 having a central area extending further from the surface 38 of the ring 34 than does a circular edge 48 of the projection 40.

(23) The segment 30 in the embodiment of FIG. 3 includes three of the projections 40. The projections 40 are equally spaced about the outer surface 38 of the ring 34 to define a space 50 located between each of the projections 40. The space 50 includes a lateral dimension which is sufficiently sized to accommodate a portion of the projection of an adjacent segment as illustrated in FIG. 4.

(24) As shown in FIGS. 4 and 5, a rope or cord 52 extends through the bore 32 of each of the segments 30. Each one of a plurality of the segments 30 is located next to another segment 30, such that one of the segments 30 nests with an adjacent segment 30. For instance a segment 30A is located between a segment 30B and a segment 30C. Segment 30D is located adjacent to segment 30B. The projections 40, of one of the segments, overlaps with the adjacent space 50 of an adjacent segment 30. For example, a projection 40B extends over and overlaps the space 50A and extends over and overlaps the space 50D such that each of segments 30 are nested with an adjacent segment 30 on one or both sides. In one embodiment, each of the plurality of segments 30 is substantially similar. In different embodiments, the rope includes a threaded cable, a braided cable, a woven cable, and a twisted cable. In one embodiment, the cable is a seven by seven twisted cable made of seven individual wires braided to form a single wire part and seven of these wire parts braided together. In one embodiment, the combined rope 52 and segments 30 include an outside diameter 53 of from about 10.0 to 12.00 millimeters. Other diameters of different sizes are also possible.

(25) To accommodate nesting of adjacent segments 30, each of the segments 30 is rotated a predetermined amount with respect to an adjacent segment 30 to overlap a space with a projection. In the segment 30, as shown in the embodiment of FIG. 3, the segment 30 includes three of the projections 40 such that the amount of rotation with an adjacent segment is approximately 60 degrees. In other embodiments of the segments having other numbers of projections, the amount of relative rotation is determined based on the number of projections. For instance, in a segment having two projections, the amount of relative rotation between adjacent segments is 90 degrees. In a segment having four projections, the amount of relative rotation between adjacent segment is 45 degrees.

(26) FIG. 5 illustrates a cross-sectional view of a few of the plurality of the nested ceramic segments of FIG. 3. In this embodiment, the rope 52 is bent such that a projection 40B extends over and into the adjacent spaces 50A and 50D, but does not contact the surfaces defining the spaces 50A and 50D. Sufficient bending of the rope 52 places the projections 40 into contact with an adjacent space 50 of an adjacent segment 30 on an inside curve of the cable. Consequently, the amount of curve of the cable is limited by contact of an inside surface 54 of a projection 40. In this and other embodiments, the rope is approximately 3 to 4 millimeters in diameter. Other diameters are also possible.

(27) FIG. 6 illustrates another embodiment of a segment 60 which includes a bore 62 through which the rope is located. The segment 60 includes a circular band or ring 64 having a circular cylindrical inner surface 66 which is generally flat from top to bottom of the segment. The ring further includes an outer surface 68 which is curved from top to bottom from which extends a plurality of projections 70. In this embodiment, the surface 68 does not include a continuous curvature, but is instead divided into two surfaces divided by a centerline 72. The centerline 72 defines a diameter with a central axis of the bore 62 which is greater than a diameter of terminating edges of the surface 68. Consequently, the surfaces extending away from the centerline 72 are inclined toward the bore 62.

(28) Each of the plurality of projections 70 is generally fin shaped and includes a height 73 having a length greater than a height 74 of the ring 64. The projections 70 are centrally located about a circumferential center defined by a central axis extending lengthwise along the segment 60, such that a portion of the projections 70 extends above the centerline 72 and a portion of the projections 70 extends below the centerline 72. The projection 70 also includes surfaces 76 which extend away from and are inclined with respect to the central axis of the bore 62. In one embodiment, the angle of inclination of the surfaces 76 away from the bore is substantially the same as the angle of inclination of each of the surfaces on either side of the centerline 72 of the surface 68.

(29) The segment 60 in the embodiment of FIG. 6 includes three of the projections 70. The projections 70 are equally spaced about the outer surface 68 of the ring 64 to define a space located between each of the projections 70. The space includes a lateral dimension which is sufficiently sized to accommodate a projection of an adjacent segment as illustrated in FIGS. 7 and 8.

(30) As shown in FIG. 7, a rope or cord 82 extends through the bore 62 of each of the segments 60. Each one of a plurality of the segments 60 is located next to another segment 60, such that one of the segments 60 nests with an adjacent segment 60. For instance a segment 60A is located between a segment 60B and a segment 60C. The projection 70 of one of the segments overlaps with the adjacent space of an adjacent segment 60. For example, a projection 70A extends over and overlaps the space of segment 60B and extends over and overlaps the space of segment 60C such that the each of segments 60 is nested with an adjacent segment 60 on one or both sides. The segments 60 and cord 82 form a ceramic body cable.

(31) To accommodate nesting of adjacent segments 60, each of the segments 60 is rotated a predetermined amount with an adjacent segment 60 to align the projections with a space. In the embodiment of FIG. 6 of the segment 60 having three of the projections 70, the amount of rotation is approximately 60 degrees. In other embodiments of segments having other numbers of projections, the amount of relative rotation is determined based on the number of projections. For instance, in a segment having two projections, the amount of relative rotation between adjacent segments is 90 degrees. In a segment having four projections, the amount of relative rotation is 45 degrees.

(32) FIG. 8 illustrates a cross-sectional view of a few of the plurality of the nested ceramic segments of FIG. 7. In this embodiment, the rope 82 is bent such that a projection 70B extends over, but does not contact the surface defining the adjacent space of segment 60A and a projection 70C also extends over, but does not contact the surface defining the space of segment 60A. Sufficient bending of the rope 82, however places the projection 70D into contact with a surface defining an adjacent space, or bearing surface, of the adjacent segment 60A on an inside curve of the rope 82. Consequently, the amount of curve of the cable is limited by contact of an inside surface or contact surface 76 of a projection 70.

(33) FIG. 9 is a perspective view of another ceramic segment 90. In this embodiment, the segment 90 includes a bore 92 through which the rope is located. The segment 90 is generally spherical and includes an inclined bearing surface 94 which extends from an outer spherical surface 96 of the segment 90 to an inner surface 98 of the bore 92. The inclined surface 94 is inclined with a central axis of the bore 92 such that the surface is generally concave and extends into the segment 90. The angle of inclination of the surface 94 is based on the curvature of the surface 96 to provide an interface between the inclined surface 94 of one segment 90 with the exterior surface 96 of an adjacent segment 90. The portion of the segment that defines the inclined bearing surface may be referred to herein as a bearing portion.

(34) Because the surface 96 is generally spherical, the surface 96 lacks areas which could provide access points for tools used to cut through the lock cable. Consequently, a cutting tool tends to skip off of the spherical surface toward an interface located between adjacent segments. The interface, however, provides a spherical surface of one segment located beneath a spherical surface of the adjacent segment to provide two layers of protective surfaces.

(35) As shown in FIGS. 10 and 11, a rope or cord 100 extends through the bore 92 of each of the segments 90. Each one of a plurality of the segments 90 (ceramic bodies) is located next to another segment 90, such that one of the segments 90 nests with an adjacent segment 90.

(36) For instance a segment 90A is located between a segment 90B and a segment 90C. The surface 96 of one of the segments interfaces with the adjacent surface 94 of an adjacent segment 90. For example, the surface 96 of segment 90B extends into a space defined by the surface 94 of the adjacent segment 90A such that each of the plurality of segments 90 is nested with an adjacent segment 90. In one embodiment, each of the plurality of segments 90 is substantially similar. In this embodiment, therefore, the exterior surface 96 of sphere 90A extends over, or overlaps, the exterior surface 96 of sphere 90B. Depending on the bend of the bend in the ceramic body cable, the surface 94 contacts the surface 96 of an adjacent segment. The combined segments 90 and cord 100 are also called a ceramic body cable 101 having ceramic bodies and a cord.

(37) FIGS. 12 and 13 illustrate one embodiment of a string 102 of the elements 90 having a first end 104 and a second end 106, each of which includes a crimped sleeve 108. In one embodiment, the crimped sleeve 108 includes a channel 110 which is slid over the rope 100 and which is crimped to collapse the sleeve 108 into direct holding contact with the rope 100. By crimping each of the sleeves 108, the segments 90 are held in direct contact with adjacent segments 90.

(38) Once each of the first end 104 and second end 106 include a crimped sleeve 108, the string 102 is inserted into a channel 111 defined by a braided sleeve 112. In one embodiment, the sleeve is made of polyethylene terephthalate. In other embodiments, other materials are used including nylon, steel, copper, aluminum, and stainless steel. The sleeve 112 is shown as being expanded with respect to the string 102 for purposes of illustration. In different embodiments, the sleeve 112 is in a collapsed condition and insertion of the string 102 expands the sleeve 112. Once the string 102 located in the channel 111, the sleeve 112 stretches around the string 102 for a form fit.

(39) After the string 102 is located within the sleeve 112, the combined the string 102 and sleeve 112 are inserted into a tube 114 of unshrunk heat shrinkable tubing as shown in FIG. 15. The tube 114 includes a diameter large enough to enable the tube 114 to slide the combined string 102 and sleeve 112, but small enough to shrink to a tight fit when heated. In different embodiments, the tube 114 is made of a thermoplastic material, including but not limited to, polyolefin, fluoropolymer, polylvinyl chloride, neoprene, silicone elastomer, or synthetic rubber.

(40) Once heated, as shown in FIG. 16, the tube 114 collapses about the sleeve 112 and conforms to the shapes of the individual segments of the string 102. After the cable 14 is complete, one end is fixedly connected to the collar 17 and the other end is fixedly connected to the collar 24. In one embodiment, the completed cable 14 includes a length of twenty-four inches.

(41) The disclosed embodiments of a cable lock provide increased security while maintaining the necessary flexibility to lock a bicycle to a stand. The cable lock is also easy to use and store transport. The flexible cable lock provides greater protection against attempts to defeat the protection provided by the cable, including attempts using power tools, angle grinders, bolt cutter, and saws. The use of the nested ceramic segments provides an improved deterrent against theft since the interface between adjacent segments is protected by the overlapping features of the segments. For instance, where the segments include projections, the projections act as a shield or barrier to a seam located between adjacent segments.

(42) While the invention has been illustrated and described in detail in the drawings and foregoing description, the same is to be considered as illustrative and not restrictive in character, it being understood that preferred embodiments have been shown and described and that all changes and modifications that come within the spirit of the inventions are desired to be protected.

(43) It should be understood that while the use of words such as preferable, preferably, preferred or more preferred utilized in the description above indicate that the feature so described may be more desirable, it nonetheless may not be necessary and embodiments lacking the same may be contemplated as within the scope of the invention, the scope being defined by the claims that follow. In reading the claims, it is intended that when words such as a, an, at least one, or at least one portion are used there is no intention to limit the claim to only one item unless specifically stated to the contrary in the claim. When the language at least a portion and/or a portion is used the item can include a portion and/or the entire item unless specifically stated to the contrary.