Patent Publication Number: US-6212918-B1

Title: Locking mechanism for portable valuables

Description:
I. FIELD OF THE INVENTION 
     This invention relates to locking mechanisms for securing personal, portable valuables and, in particular, to locking mechanisms for securing notebook computers and other small but valuable electronic devices to relatively immovable objects for safekeeping. 
     II. BACKGROUND OF THE INVENTION 
     Computer designers over the past few decades have made extraordinary progress in miniaturizing computers. Electronic devices that once occupied rooms now can comfortably fit on the lap, or in the palm, of a user. An aspect of computers that has not changed quite so much is their cost. Small computers, particularly high performance notebook computers with large screens, are still quite expensive, and their value extends beyond the replacement cost of the computer to include data, lost productivity and reconstruction time. 
     The small size of notebook computers means that they can be carried by a person on business trips as a productivity enhancement tool. The natural result is that small and expensive notebook computers are often carried into public places, like airports and hotel lobbies, where the opportunity for theft is great. Also notebook computers often are left unattended in less public, but still relatively insecure, places such as offices, conference rooms, and hotel rooms. 
     The need to prevent theft of personal valuables extends beyond notebook computers to include theft prevention of other portable valuables such as palmtop computers, desktop computer monitors, keyboards and CPUs, personal stereos, music tape and CD players, and roller blades and other personal sporting equipment. 
     Theft prevention devices have been known in the art. One such scheme employs a security slot fabricated in the notebook computer into which a locking mechanism may be fitted. Typically, a cable is attached permanently or releasably to the locking mechanism. In operation, one end of the cable of the locking mechanism is looped around a chair arm, or some other large, relatively immoveable object, and then passed through a small closed loop in the other end of the cable. The cable is attached to the locking mechanism, if not already attached, and the locking mechanism is then locked to the security slot of the notebook computer. This arrangement prevents or deters theft of the notebook computer as it cannot be freed by passing it through the small cable loop when the locking mechanism is secured to the notebook computer. 
     Locking mechanisms for securing portable valuables are disclosed, for example, in U.S. Pat. Nos. 5,327,752, 5,493,878 and 5,502,989. Most of the locking mechanisms disclosed in these patents operate in a similar manner. They have a T-shaped crossing member at the distal end of a spindle which is inserted into the security slot, and then rotated. When rotated, the extensions of the T-shaped spindle engage against the inner surface of the wall surrounding the security slot thereby preventing removal of the locking mechanism from the personal, portable valuable. 
     One limitation of these devices is that the size of the extensions of the shank of the T-shaped spindle must be less than the longest dimension of the security slot so that they may be inserted into the security slot, and the diameter of the spindle must be less than the narrowest dimension of the security slot so that the spindle can rotate in the security slot. This results in relatively little surface contact between the extensions of the shank with the inner surface of the wall surrounding the security slot, and a relatively thin spindle. When forcibly tampered with, the inner wall of the portable valuable is subject to breaking due to large forces being spread over only a relatively small surface area. The spindle, because it has a relatively small diameter, is also subject to breaking during tampering. 
     The problems with these types of locking mechanisms are further compounded by the fact that in order to accommodate a variety of security slot depths, the length of the spindle exposed beyond the locking mechanism&#39;s housing to the cross member is often longer than the depth of the security slot. As a result a gap exits between the outer surface of the wall of the portable valuable and the facing surface of the locking mechanism housing. This gap provides ready access for insertion of, and leverage for, a tool to pry the locking mechanism from the portable device by breaking either the wall surrounding the security slot or the thin spindle. 
     Another drawback to these types of locking mechanisms is the T-shaped spindle must be inserted and withdrawn from the security slot each time the personal valuable is to be secured or moved. Due to the diminutive size of security slots, this is not always an easy task. Further, over time the repeated insertion and withdrawal of the spindle may cause abrasion and chipping of the sides of the security slot, leading to its enlargement. 
     Further, both the insertion and locking of these types of locking mechanisms, as well as their unlocking and withdrawal, require the use of a key. Requiring a key to insert and lock the locking mechanism can be an annoying inconvenience to the user, leading to times where the user can not be bothered to securely lock the portable valuable in place. 
     Thus it is desired to have a locking mechanism that has an extension member that has a larger surface area for engaging a larger surface area of the inner surface of the wall surrounding the security slot of the notebook computer and a thicker spindle or shank not limited in diameter or dimensions to the smallest dimension of the security slot, thereby increasing the strength and durability of the locking mechanism, and making the locking mechanism more theft-resistant. 
     It is also desired to have a locking mechanism that fits close to the external surface of a wide variety of personal, portable valuables so as to deter their being forcibly pried from the portable valuable. 
     Further desired is a locking mechanism for portable valuables that can be locked without a key. 
     III. SUMMARY OF THE INVENTION 
     Accordingly, it is an object of the present invention to provide a locking mechanism for securing personal, portable valuables to relatively immoveable objects for safekeeping. 
     It is another object of the present invention to provide a locking mechanism for securing portable valuables that has improved restraining properties over previous locking mechanisms. 
     It is a further object of the present invention to provide a locking mechanism for securing personal valuables that has a simple design with few moving parts. 
     It is yet another object of the present invention to provide a locking mechanism for securing portable valuables that is easy and inexpensive to manufacture and simple to install. 
     It is a yet further object of the present invention to provide a locking mechanism that easily and quickly locks without a key. 
     The foregoing objectives are accomplished by the present invention of a locking mechanism for attachment to a personal portable device having an exterior wall provided with a security or restraining slot of predetermined dimensions. The locking mechanism comprises a restraining member having an inner flange mounted in a housing, a shank section adapted to extend into the restraining slot of the portable device, and a hook section adapted to engage an inner surface of the exterior wall of the portable device through the restraining slot. The inner flange of the restraining member is adapted to move between an installation position and a locked position. A fastener is coupled through the housing for extending into an aperture in the inner flange when the restraining member is in the locked position to thereby inhibit movement of the restraining member to the installation, or unlocked, position and prevent removal of the locking mechanism from the portable device. A means for coupling the housing of the locking mechanism to an object other than the portable device also is provided to secure the portable device to the other object. 
     Generally, the housing of the locking mechanism has a face that, in the locked position faces the exterior wall of the portable device, a mounting cavity wherein the inner flange is mounted, and a face opposite the first face. The second, opposite, face has an aperture there through permitting the fastener to be insertible through the second face and into the mounting cavity to extend into the aperture in the inner flange and inhibit its movement. 
     In the locking mechanism the inner flange of the restraining member may be hinged, pivotally, slidably, rotatably or otherwise moveably mounted in the mounting cavity of the housing and is adapted to swing, pivot, slide, rotate or otherwise move between the installation position and the locked position. Any suitable arrangement of cooperating indents, recesses, holes, exdents, or pins fabricated in the restraining member and mounting cavity may be employed to moveably mount the restraining member in the mounting cavity of the locking mechanism. In preferred embodiments the interior walls of the mounting cavity are provided with a slot or opposing slots for mounting therein a pin or opposing pins extending from the inner flange of the restraining member. 
     The fastener useable in the present invention, is preferably adjustable and reversible, and may be any of a wide variety, including a bayonet or cam-style latch, a fractional-turn fastener, a compression or draw latch, a panel fastener, a plunge-head fastener, a pawl-action latch, or a screw or screw-type fastener. When the fastener is a screw, the aperture in the inner flange of the restraining member preferably is provided with a threaded portion complimentary to the threaded portion of the screw. The fastener is preferably captured in the housing of the locking mechanism, so as to prevent its misplacement or loss, by any suitable means, such as a clip-on receptacle or retainer, a snap-ring, a glue-on washer, a captive-screw or a captive-screw assembly. 
     The coupling means for coupling the housing of the locking mechanism to, and thereby secure the portable device to, an object other than the portable device, may comprise a lock receptacle for receiving and engaging a lock or a traverse aperture or opposite apertures to permit a securing device, such as a cable or a lock shackle, to extend through the locking mechanism. 
     Accordingly, the present invention provides a locking mechanism for attachment to a portable device having an exterior wall provided with a restraining slot of predetermined dimensions, comprising a housing having a first face for facing engagement with an exterior wall of the portable device, a receiving cavity for receiving a lock restraint, and a second face opposite said first face, with the receiving cavity having a opening through the second face and an inner surface adapted to engage the lock restraint. The locking mechanism also comprises a restraining member having an inner flange mounted in the housing, a shank section adapted to extend into the restraining slot of the portable device, and a hook section adapted to engage an inner surface of the exterior wall of the portable device through the restraining slot. The inner flange of the restraining member is adapted to move between an installation position and a locked position. A fastener is coupled through the housing for extending into an aperture in the inner flange when the restraining member is in the locked position to thereby inhibit movement of the restraining member to the installation, or unlocked, position and prevent removal of the locking mechanism from the portable device. 
     In an alternative embodiment, the locking mechanism housing may have a receiving cavity having an opening through the second face of the housing for receiving a lock restraint, and a flange extending outward from the second face which has a “mushroom-shaped” distal end for engaging the lock restraint. 
     The “mushroom-shaped” flange may be integrated with the fastener and, therefore, there is further provided by the present invention a locking mechanism for attachment to a portable device having an exterior wall provided with a restraining slot having predetermined dimensions, comprising a housing in which is mounted an inner flange of a restraining member adapted to move between an installation position and a locked position, and having a shank section adapted to extend into the restraining slot of the portable device, and a hook section adapted to engage the inner surface of the exterior wall of the portable device through its restraining slot. A fastener is coupled through the housing with one end adapted for extending into an aperture in the inner flange when the restraining member is in the locked position to thereby inhibit movement of the restraining member to the installation position, and a “mushroom-shaped” end having an inner surface adapted for engaging a lock restraint to thereby couple the locking mechanism to a device other than the portable device. 
     As aforementioned, the coupling means of the locking mechanism of the present invention also preferably may comprise a traverse aperture or opposite apertures which permit a cable, or lock shackle, or other securing device to extend there through and thus couple the housing of the locking mechanism to another object. Therefore, a locking mechanism for attachment to a portable device having an exterior wall provided with a restraining slot having predetermined dimensions is provided by the present invention which mechanism comprises a housing having a face for facing engagement with the exterior wall of a portable device, a mounting cavity, a securing cavity having opposing apertures there through and a connecting aperture through to said mounting cavity, and an opposite second face having an opening therein. A restraining member is provided having an inner flange mounted in the mounting cavity and adapted to move between an installation position and a locked position, a shank section adapted to extend into the restraining slot of the portable device, and a hook section adapted to engage an inner surface of the exterior wall of the portable device through the restraining slot. A fastener that is insertible through the opening in the second face and through the connecting aperture and extends into an aperture in the inner flange when the restraining member is in the locked position inhibits movement of the restraining member to the installation position. In this embodiment the opposing apertures permit a securing device to couple the locking mechanism to another object. 
     One preferred embodiment of a locking mechanism employing apertures as a coupling means is one whose housing includes an outward extending flange with a traverse aperture in the flange which serves to couple the locking mechanism to another object by permitting a securing device to extend through the flange. Further preferred in this embodiment is that the outward extending flange have an axial aperture there through permitting the fastener to be insertible through the outward extending flange and into the mounting cavity thereby to extend into the aperture in the inner flange. 
     The opposite apertures also may be provided, in a preferred embodiment, in sidewalls of the locking mechanism housing substantially orthogonal to the second face. Included with this embodiment may be a security spindle to restrict access to the fastener of the locking mechanism once it is in its locked position. The security spindle is adapted for insertion into the cavity defined by the housing sidewalls and has a traverse aperture collinear with the opposing apertures in the housing sidewalls to permit a security device to extend through the housing and the spindle. 
     One embodiment of the present invention is a locking mechanism comprising a housing with a generally flat surface for facing engagement with a surface of the portable, personal valuable to be secured. Rotatably mounted within the housing is a restraining member for engaging a security slot fabricated in the portable valuable. The restraining member of the locking mechanism is generally hook-shaped, comprising an upper flange, a shank, and a hook member. Fabricated in the surface of the housing of the locking mechanism that is in facing engagement with the portable valuable is a recessed mounting cavity. The upper flange of the restraining member is shaped to conform to this recessed cavity. Two pins extend outward from the upper flange of the restraining member to engage mounting holes fabricated in the sides of the recessed cavity, thereby permitting rotational movement of the restraining member between two positions; an installation position and a locking position. In the installation position the restraining member generally extends outward from the housing. During installation the distal end of the hook member is inserted into the security slot of the portable valuable, with the shank of the restraining member being generally parallel to the surface of the portable valuable at the initial installation position. The restraining member is then rotated and laterally translated to insert the shank and hook member into the slot. In the locking position, the flange of the restraining member is initially in facing engagement with the surface of the portable valuable adjacent to the security slot. Fabricated in the flange is an aperture or screw hole that aligns with a similar aperture or through hole in the housing. In the final installation step, the housing is rotated down onto the restraining member so that the recessed cavity accepts the flange of the restraining member. A screw fastener mounted in the through hole of the housing is then rotated to engage the screw hole in the flange of the restraining member. The shank of the restraining member is sized to accommodate a range of security slot depths. In a particularly shallow security slot, as the screw is tightened into final locking position, the flange would extend below the outer surface of the housing in facing engagement with the portable valuable, leaving the housing of the locking device in facing engagement with the mounting surface of the portable valuable. 
     An alternative embodiment of the present invention is a locking mechanism comprising a housing with a generally flat surface for facing engagement with a surface of a portable valuable to be secured. The housing is cylindrical in shape. Fabricated in the surface of the housing intended to be in facing engagement with the portable valuable is a recessed cavity. A portion of this mounting cavity extends through the side of the cylindrical housing. Slidably and rotatably mounted within the recessed cavity of the housing is a restraining member. The restraining member of the locking mechanism is generally hook-shaped, comprising an upper flange, a shank, and a hook member. The upper flange of the restraining member is shaped to conform to this recessed cavity. Two pins extend outward from opposite sides of the upper flange, and are intended for mounting in slots fabricated in the sides of the recessed cavity. When mounted in the slots, the combination of the slots and the pins permit both rotational and translational movement of the restraining member. The restraining member is moveable between at least two positions, an installation position and a locking position. In the installation position, the restraining member is slidably translated so that the shank roughly aligns with the outer cylindrical surface of the housing of the locking mechanism. The shank of the restraining member is generally parallel to the surface of the portable valuable containing the security slot. A distal end of the hook member of the restraining member is inserted into the security slot. The restraining member is then rotated and laterally translated to insert the shank and hook member into the slot. In the locking position, the flange of the restraining member is initially in facing engagement with the surface of the portable valuable adjacent to the security slot. Fabricated in the flange is a screw hole aperture that aligns with a similar screw hole aperture in the housing. In the final installation step, the housing is rotated down onto the restraining member so that the recessed cavity accepts the flange of the restraining member. The shank of the restraining member is sized to accommodate a range of security slot depths. This means that as the screw is tightened into final locking position in a security slot having a relatively shallow slot depth, the flange would extend below the outer surface of the housing in facing engagement with the portable valuable, leaving the housing of the locking device in facing engagement with the mounting surface of the portable valuable. 
     Another alternative embodiment of the present invention is a locking mechanism comprising a housing with a generally flat surface for facing engagement with a surface of the portable valuable to be secured. The housing of the locking mechanism is generally cylindrical in shape. Fabricated in the surface of the housing intended to be in facing engagement with the portable valuable is a recessed mounting cavity. The recessed cavity has a generally circular shape. A portion of this cavity extends through the side of the cylindrical housing, leaving an opening in the side of the cylindrical housing. Rotatably mounted within the recessed cavity of the housing is a restraining member. The restraining member of the locking mechanism is generally hook-shaped, comprising an upper flange, a shank and a hook member. Fabricated in the sides of the circular recessed cavity is a groove. Fabricated on opposite sides of the upper flange of the restraining member are pins. When the pins are mounted in the groove, they permit circular rotation of the restraining member in a plane generally parallel to the surface of the housing intended for facing engagement with the portable valuable. The restraining member is rotatable between at least two positions, an installation position and a locking position. In the installation process, the restraining member is rotated into the installation position, where the shank of the restraining member generally aligns with the outer cylindrical surface of the housing. In the installation position, the shank of the restraining member is generally parallel to the surface of the portable valuable containing the security slot. A distal end of the hook member of the restraining member is inserted into the security slot. The restraining member is then rotated and laterally translated to insert the shank and hook member into the slot. A screw hole is fabricated in the upper flange of the restraining member. A similar screw hole is fabricated in the housing extending into the recessed cavity. A screw is inserted into the screwhole of the cavity. In the last installation step, the housing is rotated while the restraining member remains fixed in its position in the security slot. The rotation of the housing brings the screw hole in the housing into alignment with the screw hole of the upper flange. The screw is then tightened, causing it to engage the threaded screw hole in the upper flange, and thereby locking the restraining member and housing in a fixed, locked position with respect to the portable valuable. 
     A further alternative embodiment is a locking mechanism comprising a housing with a generally flat surface for facing engagement with a surface of the portable valuable to be secured. The housing is cylindrical in shape. Fabricated in the surface of the housing intended to be in facing engagement with portable valuable is a mounting cavity. Located within the recessed cavity is a restraining member and worm gear tightening mechanism. The restraining member is generally hook-shaped and comprises a hook member, shank section, and an upper worm gear portion. Mounted within the housing is a worm screw immediately adjacent to the restraining member for engaging the worm gear of the restraining member. Located on opposite sides of the restraining member near the worm gear are flanges having partially circular, and partially rectangular cross sections. These flanges are inserted into cavities having bearing surfaces permitting initial rotational movement, followed by translational movement. In the first step of the installation process, a distal end of the hook member is inserted into the security slot. The hook member and shank are then rotated and linearly translated into the security slot. At the end of this initial step of the installation process the housing surface intended to be in facing engagement with mounting surface of the portable valuable is generally orthogonal to this mounting surface. In the next step of the installation process, the worm screw is tightened, causing initial rotational movement of the housing to bring the surface of the housing intended to be in facing engagement with the mounting surface of the portable valuable into a position where the plane of the mounting surface and the plane of the surface of the housing are parallel to one another. Further tightening of the worm screw causes linear translation of the housing, bringing the housing into facing engagement with the mounting surface of the portable valuable. 
     In embodiments of the present invention, a cable lock attaches to, or is integrated with, the locking mechanism installed on the portable valuable. In alternative embodiments, the cable of a cable lock, or the shackle of a lock, or other securing device, passes through an aperture or apertures in the cylindrical housing of the locking mechanism to prevent removal of the locking mechanism from the portable valuable. 
     The present invention provides locking mechanisms to aid in preventing the theft of portable, personal valuables, such as notebook computers, having an external wall provided with a small (the industry standard presently being about 3 by 7 millimeter) approximately rectangular security or restraining slot. This small security slot is now being routinely fabricated into notebook computers and other portable valuables. 
     For portable valuables lacking a security slot, the present invention also provides locking mechanisms designed to be directly attached to an external surface of the portable valuable thereby providing mechanisms by which the personal valuable may be secured to a relatively immovable object. A lock receptacle that adhesively attaches to the portable valuable allows cable locks to be used with a portable device lacking a security slot. The lock receptacle has an attachment plate that is generally flat with a bottom surface coated with an adhesive. The adhesive adheres the attachment plate to the portable valuable. Extending outward from the center of the attachment plate is a cylindrical flange fabricated to provide a receptacle for the insertion and engagement of a lock or other securing device. 
     Thus, the present invention further provides a preferred embodiment of a locking mechanism for attachment to a portable device comprising a flat plate having a bottom adhesive surface for attaching the plate to an exterior wall of the portable device, an upper surface, and a spindle extending outward from the upper surface and having a “mushroom-shaped” distal end having an inner surface adapted for engaging a lock restraint. 
     From the description above, a number of advantages of the present invention become evident. First, the locking mechanism of the invention comprises a simple structure that is inexpensive to manufacture and install, but which provides a secure locking function for the peace of mind of owners of portable, personal valuables. In particular, the hooking member of the locking mechanism provides a greater surface with which to contact the interior surface of the wall surrounding the security slot in which the locking mechanism is mounted. In addition, the adjustable nature of the combination of the restraining member and housing which compensates for varying slot dimensions provides a locking mechanism that fits snug against the exterior surface of a portable valuable and is particularly resistant to tampering. 
     Additional advantages of the preferred embodiments of the present invention include the provision of an easy to use lock receptacle on a portable device that need not be removed each time the valuable is to be moved and that may readily engage a variety of locks, including ones that can be locked without a key. 
    
    
     IV. BRIEF DESCRIPTION OF THE DRAWINGS 
     The above and other objects and advantages of this invention will be apparent upon consideration of the following detailed description, taken in conjunction with the accompanying drawings in which like characters refer to like parts throughout and in which: 
     FIG. 1 is an isometric view of a first preferred embodiment of the present invention attached to the security slot of the portable valuable; 
     FIG. 2 is an isometric view of a first preferred embodiment of the invention showing the locking mechanism installed in a locked position in the security slot of the portable valuable, with the cable lock detached; 
     FIG. 3 is an isometric view of a first preferred embodiment of the present invention showing security slot of the portable valuable, the locking mechanism of the invention, and a cable lock; 
     FIG. 4 is a fragmentary elevation view of a security slot in a portable valuable by which the locking mechanism of embodiments of the present invention may be secured to the portable valuable; 
     FIG. 5 is a top isometric view of a restraining member of the first preferred embodiment of the present invention; 
     FIG. 6 is a cross-sectional view taken along line a—a of FIG. 5; 
     FIG. 7 is a cross-sectional view taken along line b—b of FIG. 5; 
     FIGS. 8 a-c  are schematic views showing restraining members for embodiments of the present invention; 
     FIG. 9 is a fragmentary elevation view of the distal end of a restraining member for an embodiment of the present invention in a security slot in a portable valuable; 
     FIGS. 10 a-e  are schematic views showing the theory of operation of a locking mechanism using the restraining member of FIG. 5 made in accordance with the invention; 
     FIG. 11 is a top isometric view of a restraining member of alternative preferred embodiments of the present invention; 
     FIGS. 12 a-c  are schematic views showing restraining members for embodiments of the sent invention; 
     FIGS. 13 a-d  are schematic views showing the theory of operation of a locking mechanism using the restraining member of FIG. 11 made in accordance with the invention; 
     FIG. 14 is a top isometric view of a first preferred embodiment of a locking mechanism for portable valuables, depicting the restraining member of the locking mechanism in installation position; 
     FIG. 15 is a top isometric view of a first preferred embodiment of a locking mechanism for portable valuables, depicting the restraining member of the locking mechanism in a locking position; 
     FIG. 16 is a bottom isometric view of a first preferred embodiment of a locking mechanism, depicting the captive screw and screw hole in the housing of the locking mechanism; 
     FIGS. 17 a-c  are bottom isometric views of lock receptacles of locking mechanisms of the resent invention; 
     FIG. 17 d  is a cross-sectional, top isometric view taken along line c—c of FIG. 17 a.    
     FIG. 18 is a top isometric view of a second preferred embodiment of a locking mechanism for portable valuables, depicting the restraining member of the locking mechanism in an installation position; 
     FIG. 19 is a top isometric view of a second preferred embodiment of a locking mechanism for portable valuables, depicting the restraining member of the locking mechanism in a locking position; 
     FIG. 20 is a bottom isometric view of a second preferred embodiment of a locking mechanism for portable valuables; 
     FIG. 21 is a bottom isometric view of a cover for a second preferred embodiment of a locking mechanism for personal valuables; 
     FIG. 22 is a top isometric view of a third preferred embodiment of a locking mechanism for portable valuables, depicting the restraining member of the locking mechanism in an installation position; 
     FIG. 23 is a top isometric view of a third preferred embodiment of a locking mechanism for portable valuables, depicting the restraining member of the locking mechanism in a locked position; 
     FIG. 24 is a bottom isometric view of a third preferred embodiment of a locking mechanism for portable valuables; 
     FIGS. 25 a-c  are schematic views of the third preferred embodiment depicting the theory of operation of this locking mechanism; 
     FIG. 26 is a top isometric view of a fourth preferred embodiment of a locking mechanism for portable valuables, depicting the restraining member of the locking mechanism in an installation position; 
     FIG. 27 is a top isometric view of a fourth preferred embodiment of a locking mechanism for portable valuables, depicting the restraining member of the locking mechanism a locking position; 
     FIG. 28 is a bottom isometric view of a fourth preferred embodiment of a locking mechanism for portable valuables; 
     FIG. 29 is a top isometric view of a fifth preferred embodiment of a locking mechanism for portable valuables, depicting the restraining member of the locking mechanism in an installation position; 
     FIG. 30 is a top isometric view of a fifth preferred embodiment of a locking mechanism for portable valuables, depicting the restraining member of the locking mechanism in a locking position; 
     FIG. 31 is a bottom isometric view of a fifth preferred embodiment of a locking mechanism for portable valuables; 
     FIG. 32 is a bottom isometric view of a cover for a fifth preferred embodiment of a locking mechanism for personal valuables; 
     FIGS. 33 a-c  are schematic views of a sixth preferred embodiment of a locking mechanism for portable valuables showing the theory of operation of this embodiment; 
     FIG. 34 is a schematic view of a sixth preferred embodiment of a locking mechanism for portable valuables depicting the bearing structure of the locking mechanism; 
     FIG. 35 a schematic view of a sixth preferred embodiment of a locking mechanism for locking portable valuables depicting the bearing surfaces of the locking mechanism; 
     FIG. 36 is a bottom isometric view of a sixth preferred embodiment of a locking mechanism for portable valuables depicting the housing of the locking mechanism; 
     FIG. 37 is a top isometric view of a preferred embodiment of a locking mechanism of the present invention in an unlocked position; 
     FIG. 38 is a top isometric view of a preferred embodiment of a locking mechanism of the present invention in a locked position; 
     FIG. 39 is a bottom isometric view of the preferred embodiment of FIGS. 37 and 38 illustrating its use with a cable; 
     FIG. 40 is a bottom isometric view of the preferred embodiment of FIGS. 37 and 38; 
     FIG. 41 is a top isometric view of an embodiment of a locking mechanism of the present invention assembled with a security spindle ready for use in securing a portable valuable; 
     FIG. 42 is an exploded top isometric view of the locking mechanism of FIG. 41; 
     FIG. 43 is an exploded bottom isometric view of the locking mechanism of FIG. 41; 
     FIG. 44 is a bottom isometric view of the embodiment of FIG. 41 illustrating its use with a cable; 
     FIG. 45 is a top isometric view of a preferred embodiment of a locking mechanism of the present invention in a locked position; 
     FIG. 46 is a top isometric view of a preferred embodiment of a locking mechanism of the present invention in an unlocked position; 
     FIG. 47 is a bottom isometric view of the preferred embodiment of FIGS. 45 and 46; 
     FIG. 48 is a bottom isometric view of the preferred embodiment of FIGS. 45 and 46 illustrating its use with a shackle of a lock; 
     FIG. 49 is an isometric view of a locking mechanism of the present invention adhered to the surface of a portable valuable; 
     FIGS. 50 a-e  are top, side, bottom and end view drawings of the locking mechanism of FIG. 49; 
     FIG. 51 is a side view drawing showing a modified locking mechanism of FIGS. 49 and 50; 
     FIGS. 52 a-b  are top and side view drawings of an alternative embodiment of the locking mechanism of FIGS. 49 and 50; 
     FIGS. 53 a-b  are top and side view drawings of another alternative embodiment of the locking mechanism of FIGS.  33  and  34 ; 
    
    
     It is to be understood that the drawings are for the purpose of description and illustration only and are not intended, and should not be construed, as a definition of the limits of the invention. 
     V. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     FIG. 1 depicts a first preferred embodiment of the locking mechanism  50  installed in the security slot of a personal, portable valuable  1 . Attached to the locking mechanism  50  is a cable lock  30 . The cable  31  of the cable lock  30  is looped around or through some large, relatively immovable object (not shown), and cable lock  30  is passed through a closed loop (not shown) at the end of cable  31 . The cable lock  30  then engages and locks to the cylindrical housing of the locking mechanism thereby preventing theft of the portable device. 
     FIG. 2 depicts the cable lock  30  detached from the locking mechanism  50  of the present invention. The bottom, outward-facing surface  75  of the housing  70  of the locking mechanism  50  has a recessed surface  76 . Extending outward from this recessed surface  76  is a circumferential flange  77 . Circumferential flange  77  has an edge  78  that extends inward away from the circumferential flange  77  in a plane parallel to the recessed surface  76 . Together, the surface  75 , the circumferential flange  77 , and edge  78  form a lock receptacle for receiving and engaging a cable lock  30 . That is, when installed, the cable lock  30 , fits under and engages the circumferential flange  77  and edge  78 . 
     FIG. 3 depicts the locking mechanism  50  detached from the security slot  2  of the portable valuable  1 . Clearly evident is the restraining member  90  of the locking mechanism  50 . 
     The general theory of operation of locking mechanisms embodying the present invention, as well as a detailed description of the first preferred embodiment  50  of the present invention is shown in FIGS. 4-17. 
     FIG. 4 illustrates the security slot  2  formed, by molding or otherwise as appropriate, in an exterior wall  3  of a portable valuable. The present “industry standard” security, or restraining slot has a generally rectangular configuration with long parallel sides  4  and short parallel sides  5 , and rounded corners  6 . The long dimension  7  of the slot is about seven millimeters and the short dimension  8  is about three millimeters. The corners  6  typically have a radius of curvature from about 0.3 millimeters to 1.5 millimeters. Surrounding the slot  2  is a circular space  10  concentric with the center of the slot and having a radius  11  approximately equal to half the long dimension  7  of the slot  2 . Manufacturers of portable valuables incorporated with a security slot have reserved this circular space  10  for use by locking mechanisms (i.e. electrical wiring, circuits, structures or other components or pieces of the portable device are not placed within this reserved space.) 
     FIG. 5 shows a restraining member  90  of the first preferred embodiment. The restraining member  90  comprises an upper flange  91 , a shank  92 , and a hook member  93  with a corner junction  96  and a distal end  95 . In operation, distal end  95  is inserted into a security slot  2  as more fully described hereinafter. 
     The peripheral dimensions of the shank  92  and hook member  93 , except in the vicinity of corner junction  96 , are closely conformed to the interior dimensions of slot  2  as shown in cross-section in FIGS. 6 and 7, respectively. The shank  92  and hook portion  93  of restraining member  90  have a straight-sided rectangular configuration, though the ends may be beveled or rounded to more closely conform to the interior dimensions of the security slot  2 . The long dimension  98  of the shank  92  and the long dimension  100  of hook member  93  are slightly less than the long dimension  7  of the slot  2 , preferably about 6.6 millimeters, and the short dimensions  99  and  101  are slightly less than the short dimension  6  of the slot  2 , preferably about 2.4 and about 1.9 millimeters, respectively; except in the vicinity of corner junction  96 . 
     As more readily discernable from FIGS. 8 a-c , corner junction  96  is approximately 90 degrees, and is opposed by a curvature  94 . Dimension  102  at or near the bisection of the angle of corner junction  96  is less than short dimension  99  of shank  92  and short dimension  101  of hook member  93 . In a preferred embodiment, dimension  102  is about 1.3 millimeters. Curvature  94  provides a radial or beveled transition along shank  92  and hook member  93  from short dimension  99  to dimension  102  and from dimension  102  to short dimension  101 . Corner junction  96  and curvature  94  may be formed by forging, casting or other appropriate method, and enable the restraining member  90  to fit into and be installed securely in the restraining slot  2 . 
     Further, distal end  95  of hook member  93  has a curvature  97  with a radius  104  corresponding to radius  11  of the circular space  10  surrounding security slot  2  to thereby maximize the surface contact between hook member  93  and wall  12  of the portable valuable when the hook member  93  is inserted and secured in the security slot  2 , as illustrated in FIG.  9 . 
     FIGS. 10 a-c  show the installation of the restraining member  90  into the restraining slot  2  of a portable device  1 . The steps of installation are depicted starting in FIG. 10 a . The distal end  95  of the hook member  93  is aligned with the security slot  2 ; the shank  92  of the restraining member  90  is generally parallel to the exterior mounting surface  13  of the wall  12  of portable valuable  1 . In the next step, shown in FIG. 10 b , the housing  70  is laterally translated causing the restraining member  90  to translate and pivot affecting insertion of the distal end  95  of the hook member  93  into the security slot  2 . In FIG. 10 b  the upper flange  91  lies flush against the mounting surface  13 . As can be seen, the thickness  15  of wall  12  is relatively less than the dimension  107  between corner junction  96  and corner junction  105  at the junction of flange  91  and shank  92  (which dimension  107  is preferably about 4 to 4.5 millimeters), and there is a resultant gap  112  between the distal end  95  of the restraining member  90  and the inner surface  14  of the wall  12 . The upper flange has a threaded screw hole  103  (shown in dashed lines) that aligns with a similar through hole  74  (shown in dashed lines) in the housing  37  of the locking mechanism  50 . When a screw (not shown) is threaded into screw holes  103  and  74  and is tightened, flange  91  is drawn inward of the housing  70  and distal end  95  is drawn into secure contact with the inner surface  14  of the security slot  2 , as shown in FIG. 10 c.    
     FIGS. 10 d-e  show similar installation steps for a portable valuable  1  having an exterior wall  12   a  having a thickness  15   a  only slightly less than the dimension  107  of the restraining member  90 . As can be seen in FIG. 10 d , there is a smaller gap  112   a  between the distal end  95  of the hook member and the inner surface  14   a  of the wall  12   a  of the portable valuable. This small gap, however, is closed by locking mechanism  50 , as shown in FIG. 10 e , in the same manner as described in reference to FIGS. 10 b-c.    
     To remove the locking mechanism from the portable device the fastener is removed from the aperture (screw hole) in the inner flange of the restraining member and the above described steps are followed in reverse. 
     Once the restraining member  90  is inserted into the security slot  2  and the screw has been tightened to secure surface contact between the distal end  95  and the inner surface  14  of the wall of the portable valuable, the locking mechanism cannot be removed from the portable valuable without breaking either the locking mechanism or the exterior wall of the portable valuable to which it is attached. 
     Alternatively, a restraining member  90   a  illustrated in FIGS. 11 and 12 a-c  may be employed in the locking mechanism of the present invention. Similar to restraining member  90 , restraining member  90   a  comprises an upper flange  91  a, a shank  92   a , and a hook member  93   a  with a corner junction  96   a  and a distal end  95   a.    
     As with restraining member  90 , the peripheral dimensions of the shank  92   a  and hook member  93   a , except in the vicinity of corner junction  96   a , are closely conformed to the interior dimensions of restraining slot  2 . The shank  92   a  and hook portion  93   a  of restraining member  90   a  have a straight-sided rectangular configuration, though the ends may be beveled or rounded to more closely conform to the interior dimensions of the security slot  2 . The long dimension of the shank  92   a  and the long dimension of hook member  93   a  are slightly less than the long dimension of the slot  2 , preferably about 6.6 millimeters, and the short dimensions of the shank  92   a  and of the hook member  93   a  are slightly less than the short dimension of the slot  2 , preferably about 2.4 and about 1.9 millimeters, respectively; except in the vicinity of corner junction  96   a.    
     As shown by FIGS. 12 a-c , corner junction  96   a  is approximately 90 degrees, and is opposed by a curvature  94   a . Dimension  102   a  at the bisection of the angle of corner junction  96   a  is less than short dimension  99   a  of shank  92   a  and short dimension  101   a  of hook member  93   a . Preferably, dimension  102   a  is about 1.3 millimeters. Curvature  94   a  provides a radial or beveled transition along shank  92   a  and hook member  93   a  from short dimension  99   a  to dimension  102   a  and from dimension  102   a  to short dimension  101   a . Corner junction  96   a  and curvature  94   a  may be formed by forging, casting or other appropriate method, and enable the restraining member  90   a  to fit into and be installed securely in the security slot  2 . 
     Further, as with restraining member  90 , distal end  95   a  of hook member  93   a  of restraining member  90   a  has a curvature  97   a  with a radius corresponding to the radius of the circular space surrounding security slot  2  to thereby maximize the surface contact between hook member  93   a  and inner surface  14  of wall  12  of the portable valuable when the hook member  93   a  is inserted and secured in the security slot  2 . 
     FIGS. 13 a-d  show the installation of the restraining member  90   a  into the security slot  2  of a portable valuable  1 . The steps of installation are depicted starting in FIG. 13 a  showing a locking mechanism  50   a  ready for attachment to a portable valuable  1 . The distal end  95   a  of the hook member  93   a  is inserted at a angle of about 45 degrees to the exterior mounting surface  13  of the wall  12  of portable valuable  1  as shown in FIG. 13 b . Next, as shown in FIG. 13 c  the restraining member is rotatably translated and pivoted to affect insertion of the distal end  95   a  of the hook member  93   a  into the security slot  2 . The housing  70   a  is then rotatably translated until its outer surface  71   a  is parallel to, and lies flush against the mounting surface  13 . As in restraining member  90 , the upper flange  91   a  has a screw hole  103   a  (shown in dashed lines) that aligns with a similar through hole  74   a  (shown in dashed lines) in the housing  70   a  of the locking mechanism  50   a . When a screw (not shown) is passed through hole  74   a  and threaded into screw hole  103   a  and is tightened, flange  91   a  is drawn inward of the housing  70   a  and distal end  95   a  is drawn into secure contact with the inner surface  14  of the security slot  2 , without any appreciable gap, as shown in FIG. 13 d.    
     Once the restraining member  90   a  is inserted into the security slot  2  and the screw has been tightened to secure surface contact between the distal end  95   a  and the inner surface  14  of the wall of the portable valuable, the locking mechanism cannot be removed from the portable valuable without breaking either the locking mechanism or the exterior wall of the portable valuable to which it is attached. 
     The first preferred embodiment of the locking mechanism for portable valuables  50  is further illustrated by FIGS. 14-17. The locking mechanism  50  has a generally cylindrical housing  70  with a cylindrical outer wall  80 , an outer surface  71  intended to be in facing contact with the portable valuable when in the locked position, and an opposing outer surface  75  intend to be outward facing from the portable valuable. Fabricated in surface  71  is a recessed mounting cavity  72 . Mounted within the recessed cavity  72  is the restraining member  90  which is shown to better advantage in FIG.  5 . The restraining member  90  comprises an upper flange  91 , a shank  92  and a hook member  93 . The upper flange  91  is shaped to conform to the outer contour of the recessed cavity  72  of the housing  70 . The outward facing curvature  94  of the shank  92  and hook member  93  has an arcuate cross section as more fully described here above with reference to FIGS. 8 a-c . This provides clearance for the shank and hook member during installation into the security slot. Extending outward from two opposite sides of the upper flange  91  are pins  106 . The pins  106  are intended to be mounted in circular slots  73  machined or molded in opposite walls  82  of the recessed cavity  72 . The slots permit rotational and translational movement of the restraining member  90  when the pins  106  of the restraining member  90  are mounted in the slots  73 . 
     In alternative preferred embodiments, the elliptical slots  73  of this first preferred locking mechanism  50  may be replaced by vertical slots extending through the top surface of the locking mechanism housing (as shown in FIGS.  18  and  19 ), by horizontal linear slots (as shown in FIGS.  22  and  23 ), a circumferential slot (as shown in FIGS.  26  and  27 ), or eliminated (as shown in FIGS. 29 and 30) as described hereinafter. 
     A threaded screw hole  103  is also fabricated in the upper flange  91  of the restraining member  90 . When the restraining member is in the locking position shown in FIG. 15, the threaded screw hole  103  in the upper flange  91  aligns with a matching (threaded or non-threaded) screw hole  74  in the bottom of the recessed cavity  72 . Once the restraining member  90  has been installed in the security slot of  15  the portable valuable as described above and depicted in FIGS. 10 a-e , the housing  70  is rotated down onto the upper flange  91  of the restraining member  90 . This aligns the screw hole  74  in the recessed cavity  72  with the screw hole  103  in the upper flange  91 . Tightening of a captive screw  108  engages the threaded screw hole  103  of the upper flange  91 , locking the housing  70  and restraining member  90  in locked alignment with the security slot of the portable valuable. 
     FIGS. 16 and 17 a  illustrate locking mechanism  50  in locked alignment with the security slot (not shown) of a portable valuable (not shown). The bottom, outward-facing surface  75  of the housing  70  has a recessed surface  72  or  76  in a plane substantially parallel to surface  75 . Extending substantially perpendicular to and outward from recessed surface  76  to surface  75  is a circumferential flange  77 . A circumferential edge  78  extends from circumferential flange  77  inward toward the central axis  83  of the housing  70  in a plane substantially parallel to recessed surface  76 . The combination of the outward facing surface  75 , the circumferential flange  77 , and the edge  78  forms a lock receptacle  85  for receiving and engaging a cable lock (not shown). 
     The lock receptacle  85  is further illustrated in cross-section in FIG. 17 d . Circumferential edge  78  has an inner surface  86  substantially parallel to surface  75  and a dimension  84  sized to permit the insertion of an appropriate cable lock into the lock receptacle  85  and to securely engage the engagement means of the selected lock at inner surface  86 . In FIG. 17 d  dimension  84  of edge  78  is sized such that lock receptacle  85  will receive and securely engage a clip-type cable lock such as those known in the art and commercially readily available. Preferably dimension  84  is about 1 to 1.5 millimeters. 
     In FIG. 17 b , an alternative embodiment,  50   b , of the lock receptacle according to the present invention is depicted wherein dimension  84   b  (not shown) of edge  78   b  is sized such that the lock receptacle  85   b  will receive and securely engage a ball-type lock such as that described in U.S. Pat. No. 4,742,703 and others known in the art and commercially available. Preferably dimension  84   b  is about 1.5 millimeters. 
     FIG. 17 c  illustrates another alternative embodiment,  50   c , of a lock receptacle of the present invention,  85   c , intended to receive and securely engage a one-way latch clip-type lock such as that described in U. S. Pat. No. 4,819,464 and others known in the art and commercially available. As shown in FIG. 17 c , a radial flange  87 , centered about the central axis  89  of a locking mechanism housing  70   c , extends substantially perpendicular to and outward from a recessed surface  76   c  and towards an outward-facing surface  75   c . A planar edge  88  extends from radial flange  87  outward away from the central axis  79  of the housing  70   c  in a plane substantially parallel to recessed surface  76   c . The combination of the outward facing surface  75   c , the radial flange  87 , and the edge  88  forms the lock receptacle  85   c  for receiving and engaging a latch-type cable lock (not shown). 
     In FIGS. 18-21 a second preferred embodiment of the locking mechanism,  50   d , is constructed similar to the first preferred embodiment of the locking mechanism  50  illustrated and described above. However, locking mechanism  50   d  has vertical slots  73   d  machined or molded in opposite walls  82   d  of the recessed mounting cavity  72   d  and extending openly through the top outer surface  71   d  of the housing  70   d . The slots  73   d  allow a restraining member  90  to be inserted and mounted in the recessed cavity  72   d  and permit rotational and translational movement of the restraining member  90  when its pins  106  are mounted in slots  73   d.    
     In the locking position, shown in FIG. 18, a threaded aperture  103   d  in the upper flange  91   d  of restraining member aligns with an aperture  74   d  in the bottom of the recessed cavity  72   d . A screw (not shown) can the be placed in aperture  74   d  and threaded into threaded aperture  103   d  to lock the housing  70   d  and restraining member  90   d  in locked alignment with the security slot of a portable device. As illustrated in FIG. 20, a lock receptacle  85   d  for receiving and engaging a cable lock (not shown) is formed by the combination of an outward facing surface  75   d , a circumferential flange  77   d , and an edge  78   d , the same as above described with reference to locking mechanism  50 . 
     To capture restraining member  90   d  within recessed cavity  72   d , a cover  120  is provided. Cover  120  comprises a top surface  121 , and a bottom adhesive surface  122  as shown in FIG.  21 . The cover  120  is sized to cover and adhesively adhere to the top outer surface  71   d  of the housing  70   d  of the locking mechanism  50   d  to thereby permit attachment and securing of cover  120  to the housing  70   d . An opening  123  in the top surface  121  extending through the bottom surface  122  is sized and configured to allow rotational and translational movement of restraining member  90  when pins  106  are mounted in slots  73   d  yet prevent restraining member  90  from becoming dismounted from recessed cavity  72   d.    
     In FIGS. 22-24, a third preferred embodiment of the locking mechanism,  50   e , is constructed similarly to the first embodiment of the locking mechanism  50  depicted and described above, with the exception that the recessed mounting cavity  72   e  of the housing  70   e  has an open side  79  that extends through the outer cylindrical wall  80   e  of the housing  70   e . Also, fabricated on opposite walls  82   e  of the recessed cavity  72   e  are linear slots  81 . The pins  106  of the restraining member  90  are mounted in slots  81 . When mounted in slots  81 , the restraining member  90  can be moved to an installation position where the shank  92  of the restraining member  90  extends outward and beyond the cylindrical wall  80   e  of the housing  70   e , as depicted in FIG.  22 . 
     FIGS. 25 a-c  illustrate the installation of the restraining member  90   e  of locking mechanism  50   e  into the security slot  2  of a portable valuable  1 . As shown in FIG. 25 a , the distal end  95   e  of the hook member  93   e  is aligned with the security slot  2 ; the shank  92   e  of the restraining member  90   e  is generally parallel to the exterior mounting surface  13  of the wall  12  of the portable device  1 ; and the bottom surface  75   e  and the top surface  71   e  of housing  70   e  are generally perpendicular to mounting surface  13 . Next, as shown in FIG. 25 b , the housing is rotated substantially 90 degrees to bring top surface  71   e  generally parallel to, and flush against, surface  13 . 
     After the restraining member  90   e  has been mounted in the security slot of the portable device, the housing  70   e  is rotatably translated to align the threaded screw hole  103   e  in the upper flange  91   e  of the restraining member  90   e  with the non-threaded screw hole  74   e  of the housing  70   e  as shown in FIG. 25 c . The captive screw  108   e  is then tightened, thereby engaging the screw hole  103   e  of the upper flange  91   e . As with the first preferred embodiment  50 , this operation locks the restraining member and housing in fixed alignment, preventing removal of the locking mechanism  50   e  from the security slot of the portable valuable. 
     A lock receptacle  85   e  for receiving and engaging a cable lock (not shown) is formed in locking mechanism  50   e , as illustrated in FIG. 24, by the combination of an outward facing surface  75   e , a circumferential flange  77   e , and an edge  78   e , to couple locking mechanism  50   e  to an object (not shown) other than the portable valuable. 
     Turning now to FIGS. 26-28, a fourth preferred embodiment,  50   f , of the locking mechanism for portable valuables is constructed similarly to the first preferred embodiment  50  of the locking mechanism discussed above, with the exception that the recessed cavity  72   f  of the housing  70   f  has a circular cross section, and an open side  79   f  that extends through the outer cylindrical wall  80   f  of the housing  70   f . Further, fabricated in the circular side walls  82   f  of the mounting cavity  72   f  is a circumferential slot  89 . The pins  106  of the restraining member  90  are mounted in the circumferential slot  89 . The upper flange  91  of the restraining member  90  is shaped to permit circular rotation of the restraining member  90  when the pins  106  are mounted in the circumferential slot  89  of the recessed cavity  72   f . The restraining member is moveable between at least an installation position and a locking position. In the installation position depicted in FIG. 26, the restraining member  90  is rotated so that the shank  92  aligns with the outer cylindrical wall  80   f  of the housing  70   f  After the restraining member  90  has been installed in the security slot of the portable valuable in the same manner as above described with reference to the third preferred embodiment  50   e  and as depicted in FIGS. 25 a-b , the housing  70   f  is rotated to align the screw hole aperture  103  in the upper flange  91  of the restraining member with the screw hole aperture  74   f  in the bottom of the mounting cavity  72   f , as depicted in FIG.  27 . As with other preferred embodiments, a captive screw fastener  108  is then tightened, thus engaging the screw hole aperture  103  of the upper flange  91 , and thereby locking the restraining member and housing in fixed alignment, and preventing removal of the locking mechanism  50   f  from the restraining slot of the portable valuable. 
     As illustrated in FIG. 28, the combination of an outward facing surface  75   f , a circumferential flange  77   f , and an edge  78   f  define a lock receptacle  85   f  for receiving and engaging a cable lock (not shown) to thereby couple the locking mechanism  50   f  to an object (not shown) other than the portable valuable (not shown). 
     A fifth preferred embodiment,  50   g , of the locking mechanism for portable valuables is constructed similarly to the fourth preferred embodiment  50   f  of the locking mechanism discussed above, with a recessed mounting cavity  72   g  having a circular cross section and an open side  79   g  that extends through the outer cylindrical wall  80   g  of the housing  70   g  is illustrated by FIGS. 29-32. However, in the circular side walls  82   g  of the recessed mounting cavity  72   g  there is no circumferential slot, and the restraining member  90   g  has no mounting pins. To capture restraining member  90   g  within recessed cavity  72   g , a cover  130  is provided. Cover  130  comprises a top surface  131 , and a bottom adhesive surface  132  as shown in FIG.  32 . The cover  130  is sized to cover and adhesively adhere to the top outer surface  71   g  of the housing  70   g  of the locking mechanism  50   g  to thereby permit attachment and securing of cover  130  to the housing  70   g . An opening  133  extending through the top surface  131  and the bottom surface  132  is sized and configured to allow circular rotation of restraining member  90   g  when mounted in recessed mounting cavity  72   g  yet prevent restraining member  90   g  from becoming dismounted from recessed mounting cavity  72   g . The upper flange  91   g  of the restraining member  90   g  is shaped to permit circular rotation of the restraining member  90   g  when the upper flange is mounted in the recessed cavity  72   g . The restraining member is moveable between at least an installation position and a locking position. In the installation position, the restraining member  90   g  is rotated so that the shank  92   g  aligns with the outer cylindrical wall  80   g  of the housing  70   g . After the restraining member  90   g  has been installed in the security slot of the portable valuable in the same manner as above described with reference to the fourth preferred embodiment  50   f  and as depicted in FIGS. 25 a-b , a captive screw (not shown) is tightened, engaging the screw hole  103   g  of the upper flange  91   g , and thereby locking the restraining member and housing in fixed alignment, and preventing removal of the locking mechanism  50   g  from the security slot of the portable valuable. 
     FIGS. 33-36 illustrate a sixth preferred embodiment,  140 , of the locking mechanism for portable valuables which comprises a restraining member  150 , a housing  160  and a bearing structure  170 . The theory of operation of the sixth preferred embodiment is depicted in FIGS. 33 a-c . The restraining member comprises a threaded worm gear portion  151 , a shank  152 , and a hook member  153 . The outward facing portion of the shank  152  and hook member  153  has an arcuate cross section to permit clearance during installation of the restraining member into the security slot of the portable valuable. The restraining member  150  of the sixth preferred embodiment is installed in a similar manner as the restraining member depicted in FIGS. 10 a-e . Once installed, the restraining member is brought into a locking position as depicted in FIGS. 33 a-c . FIG. 33 a  depicts the initial installation position. The restraining member  150  has two outwardly facing pins  154  that have partial circular and rectangular cross sections. These pins are intended for mounting in a bearing structure having oppositely facing bearing surfaces that have circular and rectangular cross sections (shown in phantom as  175 ). As the worm gear is rotated, the restraining member,  150 , initially rotates in that portion of the bearing surface that has a circular cross section. In this initial stage, the portion of the pins  154  having circular cross sections are in contact with those portions of the bearing surface having a circular cross section. As the rotation of the worm gear continues, the housing of the locking mechanism rotates down onto the outer surface of the portable valuable. Next, those portions of the pins having rectangular cross sections align with the portions of the bearing surfaces having rectangular cross sections, as illustrated in FIG. 33 b . As the worm gear continues to be tightened, as illustrated in FIG. 33 c  the housing is linearly displaced, and is brought into facing engagement with the mounting surface of the portable valuable. 
     The construction of the sixth preferred embodiment,  140 , of the locking mechanism is further depicted in FIGS. 34-36. The bearing structure  170  comprises a bottom facing wall  171  intended to be in facing engagement with the mounting surface of the portable valuable when the locking mechanism is installed in the security slot. Extending upward from the wall  171  are oppositely facing walls  172 . Machined in these walls are the bearing surfaces  175 . As can be seen, the bearing surfaces  175  have circular and rectangular cross sections. Connecting the two bearing walls  172  is a joining member  174 . Machined or molded in the joining member  174  is screw hole  173  for the worm screw  179 . 
     Each of the preferred embodiments of the locking mechanism,  50   d ,  50   e ,  50   f    50   g  and  140  have, as shown in FIGS. 20,  24 ,  28 ,  31  and  36 , respectively, a lock receptacle ( 85   d ,  85   e ,  85   f ,  85   g , and  185 ) formed of the same elements as above described with respect to FIG. 17 a  and preferred embodiment  50 . And, as with preferred embodiment  20 , preferred embodiments  50   d ,  50   e ,  50   f ,  50   g  and  140  may have alternative lock receptacles, such as those shown in FIGS. 17 b  and  17   c , in order to receive and engage different cable locks as above described with respect to preferred embodiment  50 . 
     Additionally, the locking mechanism of the present invention may be integrated with a cable lock in a single unit. 
     Another preferred embodiment,  200 , of the locking mechanism for portable valuables is illustrated by FIGS. 37-40. The locking mechanism  200  has a generally cylindrical housing  201  with a cylindrical wall  202 , an outer surface  203  intended to be in facing contact with the portable valuable when in the locked position, and an opposing outer surface  204  intend to be outward facing from the portable valuable. Outer surface  204  has a recessed surface  212  in a plane substantially parallel to it, which together with cylindrical wall  202  and surface  204  define a cylindrical security cavity  213 . A pair of apertures  210  are provided through cylindrical wall  202  and are sized to permit a cable  220  of a cable lock (not shown) to pass through the apertures  210 . 
     Fabricated in surface  203  is a recessed cavity  205 . Mounted within the recessed cavity  205  is a restraining member  206 , which has been previously described with reference to preferred embodiment  50 . A threaded screw hole  208  is also fabricated in the upper flange  207  of the restraining member  206 . When the restraining member is in the locking position shown in FIGS. 37 and 40, the threaded screw hole  208  in the upper flange  207  aligns with a matching screw hole  209  in the bottom of the recessed cavity  205 . Once the restraining member  205  has been installed in the security slot of the portable valuable as described above and depicted in FIGS. 10 a-e , the housing  201  is rotated down onto the upper flange  207  of the restraining member  206 . This aligns the screw hole  209  in the recessed cavity  205  with the screw hole  208  in the upper flange  207 . Tightening of a captive screw fastener  211  engages both the screw hole  209  in the recessed cavity  205  and the threaded screw hole  208  of the upper flange  207 , locking the housing  201  and restraining member  206  in locked alignment with the security slot of the portable device. 
     Once the locking mechanism  200  is in locked alignment with the restraining slot (not shown) of a portable valuable (not shown), as illustrated by FIG. 39, a cable  220  can be threaded through apertures  210  in the locking mechanism  200  and be attached to an external cable lock (not shown). The cable  220  passing through locking mechanism  200  prevents access to, and removal of, captive screw  211  from both the screw hole  209  in the recessed cavity  205  and the threaded screw hole  208  of the upper flange  207 , thus precluding theft of the portable valuable by removal of the locking mechanism  200 . 
     Preferably, the free end of cable  220  has an end-stop head  221  of the type adapted to penetrate and to be secured within a key lock (not shown) or a combination lock (not shown). With the cable  220  threaded through the apertures  210  of locking mechanism  200 , it may then be wrapped around a relatively immovable object (not shown) and the end-stop head  221  is inserted into the cable lock (not shown) and the lock is closed and locked thereby securing the portable valuable to the immovable object. 
     The embodiment of FIGS. 37-40 can be modified to provide it with a security spindle  250  to form locking mechanism  260 , as shown in FIGS. 41-44. Security spindle  250  is sized and configured to be rotatably mounted within the cylindrical cavity  213  of locking mechanism  200 . Security spindle  250  includes a cylindrical portion  251  having cylindrical sidewall  252  and a raised circular plate  253  at one end which forms its aft end. A pair of apertures  254  are provided in side wall  252 . Apertures  254  are spaced and sized to align with apertures  210  of locking mechanism  200  when mounted within the cylindrical cavity  213 , and to allow a securing device such as the cable  220  to pass through the apertures. A rectangular slot  255  in raised plate  253  extends through the length of the security spindle  250 . The rectangular slot  255  is sized and configured to permit the blade of a screwdriver (not shown) or the edge of a coin (not shown) to be inserted through the security spindle to engage the captive screw  211  of locking mechanism  200 . FIG. 41 shows security spindle  150  assembled to locking mechanism  100  to form locking mechanism  260 . 
     In operation, locking mechanism  260  is attached to a personal device in the same manner as above described with respect to locking mechanism  200 , and a screw driver or coin is inserted into and through the rectangular slot  255  to engage and tighten captive screw  212 . Once locking mechanism  260  is secured to the personal valuable, security spindle  250  is rotated to align apertures  254  with apertures  210  and cable  220  of a cable lock is threaded through the aligned apertures  210  and  254 .The personal valuable then may be secured to a relatively immovable object in the manner above described. The security spindle  250  now can neither be removed or rotated due to the cable threaded through the apertures  210  and  254  and the locking mechanism cannot be removed from the personal valuable. 
     Alternatively, the security spindle  250  may be inserted into cavity  213  of locking mechanism  200 , after locking mechanism  200  has been attached to the personal valuable. 
     Another preferred embodiment of the locking mechanism of the present invention is illustrated by FIGS. 45-48. Locking mechanism  300  has a generally cylindrical housing  330  with an outer surface  371  intended to be in facing contact with the personal, portable device when in the locked position and an opposing outer surface  375  intended to be outward facing from the portable device. Extending outward from outer surface  375  is a generally rectangular flange  376  with straight sides  377  and semicircular ends. Traversing through the sides  377  of the flange  376  is an aperture  378  which is sized to allow a cable  35  or a shackle  41  of a lock  40  to extend there through and thereby couple the housing  330  with another object. 
     Fabricated in surface  371  is a recessed surface  372  having substantially parallel walls  382 , which together define a mounting cavity for mounting a restraining member  390 . The restraining member is of the type depicted in FIG. 5, and comprises an upper flange  391 , a shank  392  and a hook member  393 . A screw hole  403  is provided in upper flange  391 . 
     When the restraining member is in the locking position shown in FIG. 45, the threaded screw hole  403  in the upper flange  391  aligns with a matching screw hole  374  in the recessed surface  372 . Once the restraining member  390  has been installed in the security slot of the portable valuable as described above and depicted in FIGS. 10 a-e , the housing  330  is rotated down onto the upper flange  391  of the restraining member  390 . This aligns the screw hole  374  in the recessed surface  372  with the screw hole  403  in the upper flange  391 . An axial aperture  379  through the end of the flange  376  to screwhole  374  in the recessed surface  372  permits tightening of a captive screw  408  which engages both the screw hole  374  in the recessed cavity  372  and the threaded screw hole  403  of the upper flange  391 , locking the housing  330  and restraining member  390  in locked alignment with the security slot of the portable valuable. 
     The preferred embodiments of locking mechanisms of the present invention heretofore described are designed to operate with personal, portable valuables provided with a security slot, such as security slot  2  depicted in FIGS. 3 and 4. Embodiments of the present invention, designed primarily to secure a personal valuable not having a security slot fabricated therein, is illustrated generally by way of reference to FIGS. 49-53. 
     FIG. 49 illustrates locking mechanism  400  affixed to the surface  451  of a personal valuable  450 . Locking mechanism  400  comprises a flat plate  411  with an upper surface  412  and a bottom surface  413 . The upper surface  412  has a raised surface  414  in a plane substantially parallel to the upper surface. Extending substantially perpendicular to and upward from the upper surface  412  to the raised surface  414  is a circumferential flange  415 . A circumferential edge  416  extends from circumferential flange  415  inward toward the central axis  417  (shown in FIGS. 50 a-e ) of the circumferential flange in a plane substantially parallel to raised surface  414 . The combination of the raised surface  414 , the circumferential flange  415 , and the edge  416  defines a lock receptacle  410  for receiving and engaging a cable lock  440 . 
     As better shown in FIGS. 50 a-e  circumferential edge  416  has an inner surface  418  substantially parallel to raised surface  414  with a dimension  419  sized to permit the insertion of cable lock  440  into the lock receptacle  410  and to securely engage the engagement means  441  of the lock at inner surface  418 . In FIG. 49 dimension  419  of edge  416  is sized such that lock receptacle  410  will receive and securely engage any variety of clip-type cable locks known in the art and commercially readily available. Preferably dimension  419  is about 1 to 1.5 millimeters. 
     An adhesive  411  is coated on the bottom surface  413  of locking mechanism  400 . In operation the adhesive  411  engages both the bottom surface of the locking mechanism  400  and the outer surface  451  of the personal valuable  450  thereby securely adhering the locking mechanism  400  to the personal valuable  450 . Preferably, adhesive  411  is a glue or glue system, such as those commercially available from the 3M Company, Industrial Tape &amp; Specialties Division, St. Paul, Minn. 55144, including a cyanoacrylate such as 3m Pronto #CA8, an epoxy such as 3m Scotch-Weld #2216, or a double-coated acrylic foam-tape such as 3m VHB #4945 which may be reversed by application of heat, cold or a solvent, neither detrimental to the appearance nor the operation of the personal device, should the user ever desire to remove the locking mechanism from the personal valuable. 
     The embodiment of FIGS. 49 and 50 may be slightly modified to provide an alternative embodiment  430  in which, in the lock receptacle  410   a  at surface  418   a  of circumferential edge  416   a , a washer  420  is provided as shown in FIG.  51 . Washer  420  may be pressed or glued to surface  418   a  and provides reinforcement to the edge  416   a.    
     In FIGS. 52 a  and  b,  an alternative embodiment of the lock receptacle of the locking mechanism  400  according to the present invention is depicted wherein dimension  419   a  of edge  416   a  is sized such that the lock receptacle  410   a  will receive and securely engage a ball-type lock such as that described in U.S. Pat. No. 4,742,703, as well as others known in the art and commercially available. Preferably dimension  309   a  is about 1 to 1.5 millimeters. 
     FIGS. 53 a  and  b  illustrate another alternative embodiment of a lock receptacle of the present invention,  490 , intended to securely engage a one-way latch clip-type lock, a variety of which are known in the art and are commercially readily available. As shown in FIGS. 53 a  and  b,  a spindle  477  extends substantially perpendicular to and upward from the upper surface  472 . Spindle  477  has a circular plate  478  at its upper end which extends from spindle  477  outward away from the central axis  479  of the spindle in a plane substantially parallel to upper surface  472 . The circular plate  478  has an inner surface  480  and an outer surface  481  .The inner surface  480  provides a means for engaging a latch-type cable lock (not shown). 
     Thus it is seen that a locking mechanism for securing personal valuables is provided. Persons skilled in the art will appreciate that the present invention can be practiced by other than the described preferred embodiments, which are presented for the purposes of illustration and not of limitation, and the present invention is therefore only limited by the claims that follow.