Abstract:
A Battery Pack for portable CMM technology. The battery gives the CMM a longer operating period and extends battery time. The battery pack is configured to work with different operating voltages required by measurement equipment made by various manufactures&#39;. The battery pack also provides a common mounting platform adapted to be utilized with the standard 3½-8 threaded equipment and accessories.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims the benefit of priority of U.S. provisional application No. 62/173,540, filed Jun. 10, 2015 the contents of which are herein incorporated by reference. 
     
    
     BACKGROUND OF THE INVENTION 
       [0002]    The present invention relates electronic power sources, and more particularly to an electronic power source for coordinate measurement machines (CMM). 
         [0003]    Currently, the time in which a portable CMM can be operated on battery power is limited. In addition, the CMM may need to be operated at different voltages for the various CMM items that that may be utilized by a technician that are manufactured by different companies. Other solutions in the industry do not provide the operator the ability to use their equipment for a longer period of time without the need to be charged with AC power. Similarly, the various battery packs available do not provide a professional mounting system. Consequently, the setup of the CMM equipment with these battery packs prolongs set up time and presents a cluttered arrangement that is not conducive to precision measurements in field environments. 
         [0004]    As can be seen, there is a need for a battery pack that gives the operator a longer period of working time, with the ability to work with different manufactures&#39; products while using one common mounting platform. 
       SUMMARY OF THE INVENTION 
       [0005]    In one aspect of the present invention, a battery pack for a coordinate measurement machine (CMM), is provided. The battery pack having a substantially hollow case having at least one sidewall, a top end, and a bottom end; a battery module contained within the case; a bottom end cap having a base coupler at a central portion thereof adapted to cooperatively engage with a base; and a top end cap having a top coupler at a central portion thereof, the coupling adapted to cooperatively engaged with a corresponding fitting of CMM positioning accessory. In some embodiments, the base coupler comprises a female threaded portion and in other embodiments, the top coupler comprises a male threaded portion. The bottom end cap is integrally formed with the case. The battery module may include a plurality of battery cells. The plurality of battery cells may be connected in series parallel. The battery pack may have an electrical housing attached to an outer surface of the at least one sidewall, and one or more of a power switch, an input power connector, an output power connector, and a visual indicator contained within the electrical housing. The visual indicator may be a plurality of LED lights configured to provide a visual display of a charge state of the battery module. An isolator may be interposed between an interior surface of the top cap and an end of the battery module. The isolator may also be interposed between an interior surface of the bottom end cap and the battery module. 
         [0006]    Other aspects of the invention include a method of providing battery power to a coordinate measurement machine (CMM). The method includes providing a battery pack having a case adapted to interconnect a base with a CMM positioning accessory. The method may also include connecting the battery pack to the base and the CMM positioning accessory. Additionally, the method includes connecting a CMM measurement tool to the CMM positioning accessory. Preferably, the method also includes electrically connecting a power output connector of the battery pack with an input power connector of the CMM measurement tool. As an additional step, the method includes performing a precision measurement of an article with the CMM measurement tool. When the battery pack has been at least partially discharged, the method may include recharging the battery pack. 
         [0007]    These and other features, aspects and advantages of the present invention will become better understood with reference to the following drawings, description and claims. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0008]      FIG. 1  is a perspective view of an embodiment of a CMM Battery Pack shown in use. 
           [0009]      FIG. 2  is a top perspective view of the battery pack. 
           [0010]      FIG. 3  is a bottom perspective view of the battery pack. 
           [0011]      FIG. 4  is an exploded view of the battery pack. 
           [0012]      FIG. 5  is an embodiment of a variable voltage output circuit. 
           [0013]      FIG. 6  is an embodiment of a battery charging circuit. 
           [0014]      FIG. 7  is an embodiment of a driver circuit for LED indicator lights. 
           [0015]      FIG. 8  is an embodiment of a dc power output circuit. 
           [0016]      FIG. 9  is an embodiment of a charging input circuit. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0017]    The following detailed description is of the best currently contemplated modes of carrying out exemplary embodiments of the invention. The description is not to be taken in a limiting sense, but is made merely for the purpose of illustrating the general principles of the invention, since the scope of the invention is best defined by the appended claims. 
         [0018]    Broadly, an embodiment of the present invention provides a battery pack that may be assembled to a piece of coordinate measuring machine (CMM) apparatus. 
         [0019]      FIG. 1  illustrates a representative item of CMM equipment is illustrated and equipped with a CMM battery pack  10 . The CMM equipment will typically include a base  28 , such as a tripod, to support a precision CMM tool  30  that may be manipulated into position to perform a desired measurement of an article. The CMM battery pack  10  of the present invention has a bottom end that may be joined to the equipment interposed between the base  28  and the articulating arm  30 . This configuration facilitates the setup, use, and reliability of the CMM system while operating on battery power, such as in field or remote locations where a technician may be tasked to perform precision measurements of an article. 
         [0020]    An embodiment of a CMM battery pack  10  is seen in reference to  FIGS. 2 and 3 . The CMM battery pack  10  includes a substantially hollow case  12  having at least one sidewall, a top end, and a bottom end. The case  12  may be formed of a rigid material, such as metal, and is preferably formed from a lightweight aluminum. A top end cap  14  may be attached to the top end of the case  12  via a plurality of fasteners, such as bolts, screws, or rivets. The end cap  14  may also be attached to the case via thread defined in the lateral edges of the cap  14  and an end portion of the case  12 . The top end cap  14  may also be formed of a metal. In a preferred embodiment, the threaded portion is preferably formed of a stainless steel. 
         [0021]    The top end cap  14  has a coupling  11  extending from a central portion of the cap  14  that is adapted to engage with a corresponding coupling of the articulating arm  30 , or similar component of a CMM apparatus. Preferably the coupling  11  will be defined with a male threaded portion to engage with a corresponding female threaded portion of the coupling of the articulating arm  30 . The male threaded portion is preferably configured with 3½-8 threads. 
         [0022]    The bottom end of the case  12  has a bottom end cap  15  that may be coupled to the case  12  in a manner similar to that of the top end cap  14 . Alternatively the bottom end cap  15  may be integrally formed with the case. The bottom end cap  15  will have a base coupler  13  defined in a central portion of the bottom end cap  15  for cooperative engagement with the base  28 . Preferably the base coupler  13  will have a female threaded portion that is adapted to engage with a male threaded portion of the base  28 . 
         [0023]    An electrical housing  26  may be attached to an exterior surface of the at least one sidewall. The electrical housing  26  may provide a mounting enclosure for an electrical input connector  21 , at least one indicator light  22 , an electrical output connector  23 , and a control switch  24 . The electrical input connector  21  provides an electrical connection between an electrical input from a charging power source (not shown) in order to recharge the battery pack  10 . The electrical output connector  23  may be operatively connected to a power input of the selected CMM equipment and conducts electrical power from the battery pack  10  to the selected equipment. 
         [0024]    The at least one indicator light  22  may provide any one of an indication of an operating condition of the battery pack  10 . For example the indicator light  22  may indicate that the unit  10  is in an on condition providing power to the CMM equipment. It may also provide a visual indication that the unit  10  is being changed by the charging power source. The indicator light  22  may also be configured to provide a visual indication of the charge level of a battery, for example a percentage of charge. The indicator light  22  may include a plurality of light emitting diode (LED) lights. The control switch  24  is operable between at least an on and an off position to control a voltage output of the battery pack  10  to the selected CMM equipment to be powered by the battery pack  10 . 
         [0025]    As seen in reference to  FIG. 4 , the battery pack  10  of the present invention will also include a battery module  18 . Preferably the battery module  18  is formed from one or a plurality of battery cells. More preferably, the battery module  18  is a lithium ion battery. The battery module  18  is contained within the sidewall of the case  12 . An isolation layer  16  is provided between the ends of the battery module  18  and the respective top and bottom caps  14 ,  15  to provide electrical isolation of the cells and to prevent the infiltration of contaminants such as dirt and debris. Preferably the isolation layer  16  is formed of an electrically insulated material. 
         [0026]    In further reference to  FIG. 4 , an aperture  25  is formed through the sidewall of the case  12  in order to permit passage of one or more electrical conductors from within the case  12  to an exterior of the case  12 . The electrical housing  26  is preferably mounted to cover the aperture  25 . The electrical housing  26  may carry one or more circuit boards configured to provide one or more electrical control or distribution functions for the battery pack  10 . One or more circuit boards may also be configured within the case  12 . 
         [0027]    An embodiment of a variable voltage output circuit is illustrated in reference to  FIG. 5 . The circuit may be configured to provide variable voltage output from the battery pack  10  to configure the battery pack  10  for operation with CMM equipment having different power requirements. The circuit may be configured for producing discrete voltages corresponding to a standard input voltage for typical CMM equipment, such as 12 volts, 18 volts, or 19.3 volts. The output voltage may be user selectable by positioning a conductor across JP 1 . The output voltage from the circuit may be connected with the electrical output connector  23 . 
         [0028]    As seen in reference to  FIG. 6 , a charging circuit is operatively connected to the input power source and the input voltage connection  21  via the connection at J 1 . The circuit MJ 1  may provide for component protection from an over charge condition and regulating the discharge of the Li ion battery  18 . 
         [0029]    A driving circuit for the one or more indicator lights  22  is illustrated in  FIG. 7 . In the embodiment shown a plurality of LED lights provide a visual representation of battery power condition. For example a green indication may correspond to a charge of approximately 100% to 75%. A charge condition of between about 75%-50% may be indicated illumination of an amber LED light  22 . A weak or battery charge of below about 25% may be indicated by a red LED light  22 . 
         [0030]      FIG. 8  dc output-standard output of 12 volts can be changed to 18 or 19.3 depending on application. 
         [0031]    A charging input is shown in reference to  FIG. 9  to receive a dc voltage input-charging input for recharging the batteries  18 . 
         [0032]    It should be understood, of course, that the foregoing relates to exemplary embodiments of the invention and that modifications may be made without departing from the spirit and scope of the invention as set forth in the following claims.