Abstract:
A locking device useful for example for bicycles in which a pair of shackles is spaced apart and fittable into cross bars, each cross bar having a locking mechanism so that the locking device can be locked and opened at either end, that is, at either cross bar.

Description:
BACKGROUND 
       [0001]    1. Field of the Invention 
         [0002]    The invention relate to locks, in particular to locks for bicycles, motor scooters and motorcycles. 
         [0003]    2. General Background and State of the Art 
         [0004]    A type of lock device which is popular for bicycles, motor scooters and motorcycles is a lock series made by Kryptonite Corp of Canton, Mass. These locks are typified by a U shaped shackle attached at its ends to a cross bar which has a lock mechanism to hold and release the shackle. These are commonly referred to as a U-lock. In these locks, the keyway can be placed at the end of the cross bar or midway of the cross bar between the ends of the shackle. See U.S. Pat. No. 5,406,812 (lock at end of cross bar) and U.S. Pat. No. 5,010,746 (lock between ends of shackle).  FIG. 1  is exemplary. In use the lock is placed around a part of a bicycle frame or wheel and a public bicycle parking stall or rack. When this is done, it is often the case that the lock is facing downwardly and is low to the ground. Bicycles can be locked to bike racks, poles, benches, in fact any structure that will give the desired security. Sometimes the type of structure and the congestion of many bicycles makes it awkward if not difficult to reach the lock and insert and turn the key to release the lock. In some cases the lock is designed as a combination lock with rotating disks which exacerbates the problem because each disk has to be seen to be rotated to the correct position. 
         [0005]    A lock of this type which does not have the disadvantage of difficult access to the lock keyway or combination dials would be advantageous especially during circumstances where the bike rack is full and difficult to maneuver. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0006]      FIG. 1  is an example of a lock of the prior art. 
           [0007]      FIGS. 2A and 2B  are an embodiment of the invention having a key lock on each of two cross bars with separate shackles. 
           [0008]      FIG. 2C  is the embodiment of  FIGS. 2A and 2B  as disassembled. 
           [0009]      FIG. 3  is an embodiment of the invention having a combination lock on each cross bar. 
           [0010]      FIG. 4  is an embodiment of the invention having a key lock on one cross bar and a combination lock on the other cross bar. 
           [0011]      FIG. 5  is an embodiment of the invention having curved cross bars. 
           [0012]      FIG. 6  shows exemplary cross-sectional shaped for the cross bars. 
           [0013]      FIG. 7  shows the parts of an embodiment of the invention contained in a container. 
           [0014]      FIG. 8  shows an embodiment of the invention in which the shackles are bowed. 
           [0015]      FIG. 9  shows an embodiment of the invention in which the shackles are made of semi-rigid hand-bendable steel cable. 
           [0016]      FIG. 10  shows an embodiment of the invention in which one shackle is made of semi-rigid hand-bendable steel cable and the other shackle is made of rigid steel. 
           [0017]      FIG. 11  shows a portion of a bicycle as an exemplary locking subject in which a part of the bicycle is used in combination with a bicycle rack as a fixed structure and the locking device captures both of them in a way that has one end of the locking device upwardly relative to the other end. 
       
    
    
     DETAILED DESCRIPTION 
       [0018]    The present invention is based on the realization that the problem of difficult access to the locking mechanism can be solved by having two cross bars each having a locking mechanism so that, while one cross bar may be inaccessible or difficult to access, the other will be more easily accessed and the user then can select the one more conveniently situated. One common circumstance, for example, is that the lock is placed downward facing which along with congestion makes its removal even more problematic. 
         [0019]    Another advantage of the present invention, in one embodiment is that the parts of the lock can be dismantled and stored more securely and conveniently than the prior locks of this type. Current U shaped locks when disassembled break into two pieces; however the present invention will allow the lock to be disassembled into four small parts which will ease carrying or transport. 
         [0020]      FIGS. 2A and 2B  are illustrative of an embodiment of the invention. The locking device  10  has a pair of shackles  12   a  and  12   b  mounted at respective ends to identical cross bars  14 . Each cross bar  14  has a lock mechanism  16  in it that operates to engage and release the shackles  12   a  and/or  12   b  at the respective cross bar. In this illustration, the lock mechanism  16  on each cross bar  14  is a key lock with the keyway  18 . The mechanism can be made so that either only one shackle is released or both shackles are released when the lock mechanism is operated. Releasing only one shackle is convenient so long as the unreleased shackle can pivot. But for the most convenience, both shackles should release so that the parts can be recovered from a congested and inconvenient location.  FIG. 2C  shows the embodiment of  FIGS. 2A and 2B  as disassembled in which the ends  19  of each shackle are shown as well as keys  17 . Equivalent disassembly can be understood for each of the following embodiments. 
         [0021]      FIG. 3  shows a similar lock  20  but in which the locking mechanism  22  is a combination lock on each cross bar  24  with the combination dials between the shackles  12   a  and  12   b.    
         [0022]      FIG. 4  shows a similar lock  30  in which one cross bar  32  has a combination lock  34  and the other cross bar  36  has a key lock  38 . 
         [0023]    In these exemplary embodiments, the keyway or combination dials is between the shackles. However, both the placement of the keyway and combination discs can be at the end of the cross bar. Also, the particular mechanism of the lock and how it engages and releases the shackles can be selected from numerous examples or created anew; although it is preferable that both shackles at the cross bar whose lock is operated are released so as to allow the lock to be put in place and removed; however as mentioned above, a design that only releases one shackle is possible. Examples of lock placements can be seen in U.S. Pat. Nos. 4,155,231; 5,010,746; 5,406,812 and 5,647,520 the content of each of which is incorporated herein by reference. 
         [0024]    In particular, in U.S. Pat. No. 5,406,812 a mechanism is shown that locks and releases both ends of the U-shaped shackle from the single cross bar (lock case 2) as applied to the present invention, each of the two shackles would be locked and releasable at both ends. 
         [0025]    Another embodiment is shown in  FIG. 5  in which the lock  40  has the cross bars  42  which are curved and showing combination locks on each. As described above, the curved cross bar embodiment can have any selection of two combination locks, two key locks or one of each. 
         [0026]    In further embodiments, the cross bars can have any conveniently selected cross-sectional shape such as a round, square (rectangular) or hexagonal cross-sectional shape as shown in  FIG. 6 . 
         [0027]      FIG. 7  represents an exemplary packaging  50  for the present invention having a container  52  such a flexible plastic or cloth and the cross bars  54  and the shackles  58   a  and  58   b  along with a key  60 . 
         [0028]    While the shackles have been shown as straight, they could have any selected shape.  FIG. 8  is illustrative in which the lock  70  has shackles  72   a  and  72   b  which are outwardly bowed. 
         [0029]    Also, the shackles could be made of a stiff cable which while rigid could be bent by hand to enable it to be fitted to an awkwardly arranged bicycle and locking safety place. In such case, it would be only necessary that a cross bar release one of the shackles because it could be bent away so as to allow the lock to be applied and removed. This is shown in  FIG. 9  in which lock  80  has shackles  82   a  and  82   b  made of semi-rigid cable, so that as seen for cable  82   a,  it can be bent away to provide a convenient opening as at  84 . 
         [0030]    In that regard, as seen in  FIG. 10 , it is possible to make lock  90  with one shackle  92   a  of semi-rigid cable and the other  92   b  of rigid steel. 
         [0031]    In use the lock will be applied to a bicycle or other personal vehicle such as a motor scooter or a motorcycle generally referred to as a locking subject and some fixed structure, which will often, but not always be a bicycle rack. Other structures could of course, be utility poles, benches and fences. 
         [0032]      FIG. 11  shows a portion of a bicycle  99 , having as a typical part thereof bicycle frame member  100  and a fixed structure exemplary of which is a bicycle rack  102  on which the locking device  104  has been installed. The locking device  104  is at an angle which is typical of these types of bicycle parking arrangements. As can be seen, the cross bar  12   a  is downwardly facing while the cross bar  12   b  is upwardly facing. Therefore, the lock can be operated from the upwardly facing cross bar  12   b.    
         [0033]    While the invention is described in terms of specific embodiments, other embodiments could readily be adapted by one skilled in the art. Accordingly, the scope of the invention is limited only by the following claims. 
         [0034]    The foregoing Detailed Description of exemplary embodiments is presented for purposes of illustration and disclosure in accordance with the requirements of the law. It is not intended to be exhaustive nor to limit the invention to the precise form(s) described, but only to enable others skilled in the art to understand how the invention may be suited for a particular use or implementation. The possibility of modifications and variations will be apparent to practitioners skilled in the art. No limitation is intended by the description of exemplary embodiments which may have included tolerances, feature dimensions, specific operating conditions, engineering specifications, or the like, and which may vary between implementations or with changes to the state of the art, and no limitation should be implied therefrom. This disclosure has been made with respect to the current state of the art, but also contemplates advancements and that adaptations in the future may take into consideration of those advancements, namely in accordance with the then current state of the art. It is intended that the scope of the invention be defined by the Claims as written and equivalents as applicable. Reference to a claim element in the singular is not intended to mean “one and only one” unless explicitly so stated. Moreover, no element, component, nor method or process step in this disclosure is intended to be dedicated to the public regardless of whether the element, component or step is explicitly recited in the claims.