Patent Publication Number: US-2012043838-A1

Title: Electrical connector for a motor

Description:
BACKGROUND OF THE INVENTION 
     The subject matter described herein relates generally to motors and, more particularly to an electrical connector for a motor. 
     Motors are frequently used in electrically powered devices, for example, appliances and the like. The motor receives power from the electrically powered device. In particular, magnetic wires provided in the motor are connected to a power cable of the electrically powered device to provide power to the motor. The magnetic wires are typically terminated within the motor and joined to a lead wire that extends through a housing of the motor. The lead wire is then joined to the power cable of the electrically powered device. The power cable delivers an electrical current to the motor to drive the motor, thereby operating the electrically powered device. 
     However, conventional connectors used in motors are not without disadvantages. As set forth above, the magnetic wires of the motor are typically terminated to the lead wire within the motor. Terminating the magnetic wires within the motor may increase production time and cost. In particular, the magnetic wires must be coupled to an additional component, for example, the lead wire that joins the magnetic wire and the power cable. Moreover, if the motor malfunctions, the motor may have to be opened to access the termination end of the magnetic wires. The lead wire may also be required to be replaced, thereby adding costs to the maintenance and repair of the motor. Additionally, the lead wires generally include a single termination per magnetic wire. As a result, multiple magnetic wires must be terminated to the lead wire to provide power to the motor. Having multiple magnetic wires increases the chance of the motor malfunctioning and/or becoming damaged. 
     A need remains for an electrical connector that terminates the magnetic wires of a motor outside the motor housing. 
     SUMMARY OF THE INVENTION 
     In one embodiment, an electrical connector is provided. The electrical connector includes a connector housing having a wire end and a termination end. An opening extends between the wire end and the termination end. The housing is configured to mount to a housing of a motor such that the wire end of the connector housing is positioned within a motor housing and the termination end of the connector housing is positioned outside of the motor housing. The termination end of the connector is configured to receive a power cable from an electrically powered device. A contact is provided having a wire end and a termination end. The contact is positioned and oriented within the opening of the connector housing so that the wire end of the contact is located within the wire end of the connector housing and the termination end of the contact is located within the termination end of the connector housing. The wire end of the contact is configured to connect to a wire of the motor. A pair of termination prongs is formed at the termination end of the contact. The pair of termination prongs is configured to terminate the wire of the motor. The pair of termination prongs is configured to connect to the power cable of the electrically powered device. 
     In another embodiment, an electrical contact is provided. The contact includes a positioning body configured to position the contact in a connector housing, wherein the connector housing is mounted to a housing of the motor. A wire end extends from the positioning body and is configured to be positioned within the housing of the motor. The wire end is configured to connect to a wire of the motor. A termination end extends from the positioning body opposite the wire end. The termination end is configured to be positioned outside the housing of the motor. The termination end is electrically joined to the wire end. A pair of termination prongs is formed at the termination end of the contact. The pair of termination prongs is configured to terminate the wire of the motor. The pair of termination prongs is configured to connect to a power cable of an electrically powered device. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic of a motor formed in accordance with an embodiment and coupled to an electrically powered device. 
         FIG. 2  is a front perspective view of an electrical connector formed in accordance with an embodiment that may be used with the motor shown in  FIG. 1 . 
         FIG. 3  is front perspective view of the electrical connector shown in  FIG. 2  having the cover in a closed position. 
         FIG. 4  is a back perspective view of the electrical connector shown in  FIG. 2 . 
         FIG. 5  illustrates an exploded view of the area  5  shown in  FIG. 4 . 
         FIG. 6  is a top perspective view of a contact formed in accordance with an embodiment. 
         FIG. 7  is a view of a blank formed in accordance with an embodiment and configured to form the contact shown in  FIG. 6 . 
     
    
    
     DETAILED DESCRIPTION OF THE DRAWINGS 
     The foregoing summary, as well as the following detailed description of certain embodiments will be better understood when read in conjunction with the appended drawings. As used herein, an element or step recited in the singular and proceeded with the word “a” or “an” should be understood as not excluding plural of said elements or steps, unless such exclusion is explicitly stated. Furthermore, references to “one embodiment” are not intended to be interpreted as excluding the existence of additional embodiments that also incorporate the recited features. Moreover, unless explicitly stated to the contrary, embodiments “comprising” or “having” an element or a plurality of elements having a particular property may include additional such elements not having that property. 
       FIG. 1  illustrates a motor  100  formed in accordance with an embodiment and coupled to an electrically powered device  102 . The electrically powered device may be an appliance, for example, a dishwasher or the like. The motor  100  is an electrical motor that is configured to operate a mechanical portion of the electrically powered device  102 . The motor  100  is illustrated as being separated from the electrically powered device  102 . Alternatively, the motor  100  is housed within the electrically powered device  102 . The electrically powered device  102  includes a power cable  104  extending therefrom. The power cable  104  includes a device end  106  and a connector end  108 . The device end  106  connects to the electrically powered device  102 . 
     The motor  100  is surrounded by a housing  110 . The housing  110  is configured to protect the motor  100  and those in contact with the motor  100 . The housing  110  has an electrical connector  112  positioned therein. The electrical connector  112  includes a wire end  114  and a termination end  116 . The termination end  116  is configured to engage the connector end  108  of the power cable  104 . The wire end  114  is configured to engage wires  118  that extend from the motor  100 . The wires  118  terminate at the electrical connector  112 . The electrical connector  112  is joined to a wall  120  of the housing  110  to avoid having to terminate the wires  118  within the housing  110  and extending lead wires through the housing  110 . The power cable  104  directs power from the electrically powered device  102  to the wires  118  of the motor  100 . The wires  118  direct the power to the motor  100  to drive the motor  100 . In turn, the motor  100  operates a mechanical device of the electrically powered device  102 . 
       FIG. 2  illustrates the electrical connector  112 . The electrical connector  112  includes a housing  122  having a body  124 . The body  124  includes a top  121  and a bottom  123 . The body  124  includes a wire end  126  and termination end  128 . The wire end  126  extends from the termination end  128 . The wire end  126  and the termination end  128  may be integrally formed. In another embodiment, the wire end  126  and the termination end  128  may be formed as separate pieces that are mechanically joined. An opening  130  extends through the body  124  between the wire end  126  and the termination end  128 . The opening  130  includes contacts  132  extending therethrough. The contacts  132  are configured to electrically couple the wires  118  (shown in  FIG. 1 ) and the connector end  108  (shown in  FIG. 1 ) of the cable  104  (shown in  FIG. 1 ). The wires  118  are configured to be received in the wire end  126  of the connector  112 . The connector end  108  of the cable  104  is configured to be received in the termination end  128  of the connector  112 . 
     The wire end  126  includes a top  134  and a bottom  136 . A motor engagement flange  138  extends from the bottom  136  of the termination end  128 . The motor engagement flange  138  may be formed integrally with the wire end  126 . Optionally, the motor engagement flange  138  and the wire end  126  may be formed as separate pieces that are mechanically joined. The motor engagement flange  138  is configured to engage the wall  120  (shown in  FIG. 1 ) of the motor housing  110  (shown in  FIG. 1 ) to align the connector  112  with respect to the wall  120 . The motor engagement flange  138  may also retain the connector  112  within the wall  120  of the motor housing  110 . The motor engagement flange  138  includes a front end  140  and a back end  142 . The front end  140  includes an alignment rail  144  that extends along the front end  140 . The alignment rail  144  positions the connector  112  with respect to the wall  120  of the motor housing  110 . The front end  140  includes a tab  146  that engages the wall  120  to retain the connector  112  within the motor housing  110 . In an alternative embodiment, the front end  140  of the motor engagement flange  138  may includes notches, grooves, protrusions, or the like to align and retain the connector  112  with respect to the motor housing  110 . The wire end  126  of the connector  112  is configured to position within the motor housing  110 . The termination end  128  of the connector  112  is configured to position outside of the motor housing  110 . 
     The termination end  128  includes a front  148  and a back  150 . The wire end  126  includes a front  152  and a back  154 . The back  150  of the termination end  128  is joined to the front  152  of the wire end  126 . The back  150  of the termination end  128  includes a cover  156  coupled thereto. The cover  156  is joined to the back  150  of the termination end  128  with hinges  158 . The cover  156  includes a top  160  and a shield  162 . The shield  162  extends at an angle from the top  160 . The cover  156  is configured to rotate about the hinges  158  in the direction of arrows  168  and  170  between an open position  164  (illustrated in  FIG. 2 ) and a closed position  166  (illustrated in  FIG. 3 ). In the open position  164 , the cover  156  extends upward from the top  121  of the connector  112 . In the open position  164 , the wires  118  are can be inserted into the wire end  126  of the connector  112 . 
     Referring to  FIG. 3 , in the closed position  166 , the cover  156  is rotated downward in the direction of arrow  168 . In the closed position  166 , the top  160  of the cover  156  extends along the top  121  of the connector  112 . The shield  162  extends toward the bottom  123  of the connector  112 . The shield  162  extends along the wire end  126  of the connector  112 . The cover  156  is configured to shield and protect the wires  118  (shown in  FIG. 1 ) extending from the wire end  126  of the connector  112 . The cover  156  is moveable in the direction  170  into the open position  164  (illustrated in  FIG. 2 ). 
     Referring back to  FIG. 2 , the termination end  128  includes a top  172  and a bottom  174 . The top  172  includes protrusions  176 . The protrusions  176  extend from the front  148  of the termination end  128  to the back  150  of the termination end  128 . Grooves  178  are formed between adjacent protrusions  176 . The grooves  178  and the protrusions  176  are configured to receive corresponding grooves and protrusions formed on the connector end  108  of the cable  104 . The grooves  178  and protrusions  176  are configured to align the connector end  108  of the cable  104  on the termination end  128  of the connector  112 . The grooves  178  and protrusions  176  retain the connector end  108  of the cable  104  on the termination end  128  of the connector  112 . Optionally, the termination end  128  of the connector  112  may include notches, latches, or the like that are configured to engage corresponding features on the connector end  108 ′ of the cable  104 . 
     The opening  130  defines an inner surface  180  of the termination end  128 . The inner surface  180  includes protrusions  182  and grooves  184 . The grooves  184  are formed between adjacent protrusions  182 . The grooves  184  and protrusions  182  are illustrated at a center  186  of the termination end  128 . Alternatively, the grooves  184  and protrusions  182  may be located at any point along the inner surface  180  of the termination end  128 . The grooves  184  and protrusions  182  engage corresponding grooves and protrusions formed on the connector end  108  of the cable  104 . Optionally, the termination end  128  of the connector  112  may include notches, latches, or the like that are configured to engage corresponding features on the connector end  108  of the cable  104 . 
     The contacts  132  extend through the opening  130  of the termination end  128 . The contacts  132  include a termination end  190  and a wire end  192  (shown in  FIG. 4 ). The termination ends  190  of each contact  132  extend through the termination end  128  of the connector  112 . Each contact  132  includes two termination ends  190  that are configured to engage the connector end  108  of the cable  104 . The two termination ends  190  extend from a single wire end  192  to provide dual termination for a single wire  118 . The contacts  132  eliminate the need for lead wires extending from the motor  100 . 
       FIG. 4  illustrates a back perspective view of the connector  112 . 
       FIG. 4  illustrates the connector  112  having the cover  156  in the open position  164 . When the cover  156  is in the open position  164 , the wire end  126  of the connector  112  is accessible. The wire end  192  of each contact  132  extends through the opening  130  in the wire end  126  of the connector  112 . Each contact  132  includes a single wire end  192  coupled to two termination ends  190  (shown in  FIG. 3 ). The wire end  192  includes a crimp  194 . The crimp  194  is configured to crimp to one of the wires  118  (shown in  FIG. 1 ) extending from the motor  100  (shown in  FIG. 1 ). Alternatively, the wire end  192  may include a wire that is twisted to the wire  118 . In another embodiment, the wire end  192  of the contact  132  may otherwise electrically couple to the wire  118 . 
     The opening  130  of the wire end  126  of the connector  112  includes ports  196  spaced along the wire end  126 . The ports  196  are defined between walls  198 . The ports  196  are configured to receive a contact  132  therein. Each port  196  that is configured to receive a contact  132  includes a half-wall  200 . The half-wall  200  enables a contact  132  having dual termination ends  190  to be inserted through the port  196 . Each termination end  190  is configured to be received on one side of the half-wall  200 . The crimp  194  is positioned below the half-wall  200 . The ports  196  include tabs  202  extending from the walls  198 . The tabs  202  are configured to engage the contact  132  to retain the contact  132  within the port  196 . Alternatively, the ports  196  may include grooves, notches, latches, or the like to retain the contacts  132  therein. 
       FIG. 5  illustrates an exploded view of the area  5  shown in  FIG. 4 . The contacts  132  are inserted into ports  196 . The contacts  132  include shoulders  204  that are positioned proximate to the crimp  194 . The shoulders  204  are positioned above the crimp  194 . A shoulder  204  is provided on each side of the crimp  194 . The shoulders  204  may extend from the termination ends  190  (shown in  FIG. 2 ) of the contact  132 . The shoulders  204  provide a surface for inserting the contact  132  into the port  196 . The contact  132  is inserted into the port  196  from the wire end  126  of the connector  112 . The contact  132  is positioned between the walls  198 . The contact  132  is positioned within the port  196  so that the termination ends  190  of the contact  132  are positioned on opposite sides of the half-wall  200 . The port  196  includes an alignment slot  199  to align the contact  132  therein. 
     Force is applied to the shoulders  204  of the contact  132  so that the contact slides into the port  196 . The shoulders  204  provide a surface to receive the force without placing force on the crimp  194  of the contact  132 . When the contacts are pushed into the port  196 , a retention clip  201  (shown in  FIG. 6 ) slides into the port  196  and stops. The alignment tab  197  hits the top of the housing  122  and the retention clips  201  are positioned within the housing  122 . Once the retention clips  201  are positioned, the retention clips  201  are bent back so that the contacts  132  cannot pushed back. A wedge like feature  203  (shown in  FIG. 4 ) at the bottom of the cover  156  prevents the contacts  132  from dislodging. The wire  118  is connected to the crimp  194  prior to the contact  132  being inserted into the port  196 . Force applied to the crimp  194  may dislodge the wire  118 . The shoulders  204  prevent the wire  118  from becoming dislodged from the contact  132  as the contact  132  is inserted into the port  196 . When the contact  132  is positioned within the connector  112 , the termination ends  190  of the contact extend through the termination end  128  of the connector  112 . The wire end  192  of the contact  132  extends through the wire end  126  of the connector  112 . The crimp  194  is positioned below the half-wall  200 . The contact  132  is retained in position by the tabs  202 . The contact  132  is retained so that the termination ends  190  of the contact  132  can be engaged by the connector end  108  (shown in  FIG. 1 ) of the cable  104  (shown in  FIG. 1 ). 
     After the contacts  132  are inserted into the ports  196 , the cover  156  is moved into the closed position  164  to protect the wires  118  extending from the wire end  126  of the connector  112 . The shield  162  of the cover  156  protects the wires  118  from substances such as dust, water, and the like. 
       FIG. 6  illustrates a contact  132 . The contact  132  includes the termination ends  190  and the wire end  192 . A positioning body  206  extends between the termination ends  190  and the wire end  192 . The positioning body  206  is configured to align the contact  132  with a port  196 . The positioning body  206  includes a base  208  having a front  210  and a back  212 . The base  208  has a planar configuration. Optionally, the base  208  may have a non-planar configuration. Opposite sides  214  extend from the base  208 . The sides  214  extend between the front  210  and back  212  of the base  208 . Optionally, the sides  214  may extend any distance along an intermediate location between the front  210  and the back  212  of the base  208 . The sides  214  extend orthogonally from the base  208 . In another embodiment, the sides  214  may extend at any angle from the base  208 . The sides  214  may extend at the same angle with respect to the base  208 . Optionally, the sides  214  may extend at different angles with respect to the base  208 . 
     The sides  214  include a front  216  and a back  218 . The sides  214  include a top  220  and bottom  222 . The bottom  222  is joined to the base  208 . Each side  214  has a height  224  defined between the top  220  and the bottom  222 . The shoulders  204  extend from the back  218  of the sides  214 . The illustrated embodiment shows a shoulder  204  extending from each side  214 . Optionally, the contact  132  may include one shoulder  204  extending from one side  214 . Each shoulder  204  extends inward toward the opposite side  214 . In another embodiment, the shoulders  204  may extend outward away from the opposite side  214 . In one embodiment, one shoulder  204  may extend inward and the other shoulder  204  may extend outward. The shoulders  204  extend a length  226  along the sides  214 . The length  226  is less than the height  224  of the sides  214 . Optionally, the shoulders  204  may extend the entire height  224  of the sides  214 . In the illustrated embodiment, the shoulders  204  extend the same length  226 . Alternatively, the shoulders  204  may extend different lengths  226 . The shoulders  204  are positioned proximate to the top  220  of the sides  214 . In another embodiment, the shoulders  204  may be positioned at any intermediate location between the top  220  and the bottom  222  of the sides  214 . 
     An alignment tab  228  extends from each side  214 . In another embodiment, the contact  132  includes one alignment tab  228  extending from one of the sides  214 . Optionally, either side  214  may include multiple alignment tabs  228 . The alignment tabs  228  extend from the top  220  of each side  214 . Optionally, the alignment tabs  228  may extend from the bottom  222  of each side  214  and/or from an outer surface  230  of each side  214 . The alignment tabs  228  extend proximate to the termination ends  190  of the contact  132 . The alignment tabs  228  may extend proximate to the wire end  192  of the contact  132 . Alternatively, an alignment tab  228  may be positioned proximate to both the termination end  190  and the wire end  192 . In another embodiment, the alignment tab  228  may be positioned at any intermediate location along the side  214  between the termination ends  190  and the wire end  192 . Once the alignment tabs  228  hit the top of the housing  122 , the alignment tabs  228  prevent the contact  132  from moving forward. The wedge like feature  203  and the retention clips  201  prevent the contact  132  from moving backward and dislodging 
     A termination end  190  extends from the front  216  of each side  214 . In an exemplary embodiment, the termination ends  190  are formed as blades  232 . The blades  232  are configured to be received in slots formed in the connector end  108  (shown in  FIG. 1 ) of the cable  104  (shown in  FIG. 1 ). Alternatively, the termination ends  190  may be formed as pins, posts, or the like. In one embodiment, the termination ends  190  are formed as any suitable electrical connector that provides dual termination. The blades  232  extend in parallel from the front  216  of each side  214 . The blades  232  are spaced a distance  234 . The distance  234  is selected based on a configuration of the connector end  108  of the cable  104 . The blades  232  are oriented in parallel with the sides  214  of the positioning body  206 . In an alternative embodiment, the blades  232  may be oriented at an angle with respect to the sides  214 . The blades  232  may be oriented at the same angle with respect to the sides  214 . Optionally, each blade  232  may be oriented at a different angle with respect to the sides  214 . 
     The wire end  192  extends from the base  208  of the positioning body  206 . Optionally, the wire end  192  may extend from one of or both of the sides  214 . The wire end  192  is centered between the sides  214 . Optionally, the wire end  192  may be positioned proximate to one of the sides  214 . The wire end  192  includes a base  236 . The base  236  extends from the base  208  of the positioning body  206 . The base  236  includes a front  238  and a back  240 . The front  238  of the base  236  is joined to the base  208  of the positioning body  206 . A first pair of opposite sides  242  extends from the base  236  proximate to the front  238  of the base  236 . The sides  242  and the base  236  form a crimp  244 . The crimp  244  is configured to receive a wire  118  (shown in  FIG. 1 ) of the motor  100  (shown in  FIG. 1 ). The wire  118  is positioned on the base  236 . The sides  242  are configured to fold downward toward the base  236  to crimp the wire between the sides  242  and the base  236 . 
     A second pair of opposite sides  246  extends from the base  236  proximate to the back  240  of the base  236 . The sides  246  form the crimp  194 . The crimp  194  receives the wire  118  therein. The sides  246  are bent toward the base  236  to crimp the wire  118  between the sides  246  and the base  236 . The crimp  194  and the crimp  244  retain the wire  118  within the contact  132 . The crimps  194  and  244  form an electrical connection between the wire  118  extending from the motor  100  and the contacts  132 . 
     The connector  112  provides an electrical connection between the wires  118  of the motor  100  and the cable  104  of the electrically powered device  102 . The connector  112  enables dual termination of a single wire  118  thereby reducing a number of wires  118  that are required to extend from the motor  100 . The connector  112  also enables the wires  118  to be terminated at the housing  110  of the motor  100 . The wires  118  are not required to be terminated to lead wires that extend from the housing  110 . Rather, the wires  118  are terminated at the housing, thereby eliminating the need for lead wires. Terminating the wires  118  at the motor housing  110  reduces time and costs associated with assembly and maintenance of the motor  100 . 
       FIG. 7  illustrates a blank  300  formed in accordance with an embodiment and that may be used to form the contact  132  (shown in  FIG. 6 ). The blank  300  is stamped and formed to form the contact  132 . The blank  300  includes a center panel  302 . The center panel  302  includes a back end  304 . A crimp panel  306  extends from the back end  304  of the center panel  302 . The crimp panel  306  includes a front end  308  coupled to the back end  304  of the center panel  302 . The crimp panel  306  includes a back end  310  positioned opposite the front end  308 . A pair of sides  312  extend along opposite fold lines  314  proximate to the front end  308  of the crimp panel  306 . Another pair of sides  316  extend along opposite fold lines  318  proximate to the back end  310  of the crimp panel  306 . 
     The sides  312  are configured to fold along the fold lines  314 . The sides  312  are folded substantially orthogonally with respect to the crimp panel  306 . The sides  312  and the crimp panel  306  form the crimp  194  of the contact  132 . The sides  316  are configured to fold along the fold lines  318 . The sides  316  are folded substantially orthogonally with respect to the crimp panel  306 . The side  316  and the crimp panel  306  form the crimp  244  of the contact  132 . 
     Side panels  320  extend from the center panel  302  along fold lines  322 . The side panels  320  include a front end  324  and a back end  326 . Tabs  328  extend along the back end  326 . The tabs  328  extend along a fold line  330 . The side panels  320  also include a top  332  and a bottom  334 . The bottom  334  is joined to the center panel  302  along the fold line  322 . A tab  336  extends from the top  332  of each side panel  320 . 
     The side panels  320  are folded along the fold lines  322 . The side panels  320  are folded substantially orthogonally with respect to the center panel  302 . The side panels  320  and the center panel  302  form the positioning body  206  of the contact  132 . The tabs  336  extend from the top  332  of each side panel  320  to form the alignment tabs  228  of the contact  132 . The tabs  328  are folded along the fold line  330  to form the shoulders  204  of the contact  132 . The tabs  328  are folded substantially orthogonally with respect to the side panels  320 . 
     A blade panel  338  extends from the front  324  of each side panel  320 . The blade panels  338  include an inner side panel  340  extending along a fold line  342 . The blade panels  338  include an outer side panel  344  extending along a fold line  346 . The inner side panels  340  are folded along the fold line  342 . The inner side panels  340  are positioned to abut the blade panel  338 . The outer side panels  344  are folded about the fold line  346 . The outer side panels  344  are positioned to abut the blade panel  338 . The blade panel  338  and the inner and outer side panels  340  and  344  form the blades  232  of the contact  132 . 
     It is to be understood that the above description is intended to be illustrative, and not restrictive. For example, the above-described embodiments (and/or aspects thereof) may be used in combination with each other. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the various embodiments of the invention without departing from their scope. While the dimensions and types of materials described herein are intended to define the parameters of the various embodiments of the invention, the embodiments are by no means limiting and are exemplary embodiments. Many other embodiments will be apparent to those of skill in the art upon reviewing the above description. The scope of the various embodiments of the invention should, therefore, be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. In the appended claims, the terms “including” and “in which” are used as the plain-English equivalents of the respective terms “comprising” and “wherein.” Moreover, in the following claims, the terms “first,” “second,” and “third,” etc. are used merely as labels, and are not intended to impose numerical requirements on their objects. Further, the limitations of the following claims are not written in means-plus-function format and are not intended to be interpreted based on 35 U.S.C. §112, sixth paragraph, unless and until such claim limitations expressly use the phrase “means for” followed by a statement of function void of further structure. 
     This written description uses examples to disclose the various embodiments of the invention, including the best mode, and also to enable any person skilled in the art to practice the various embodiments of the invention, including making and using any devices or systems and performing any incorporated methods. The patentable scope of the various embodiments of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if the examples have structural elements that do not differ from the literal language of the claims, or if the examples include equivalent structural elements with insubstantial differences from the literal languages of the claims.