Patent Publication Number: US-6988884-B2

Title: Utility lighter with safety device

Description:
BACKGROUND OF THE PRESENT INVENTION 
   1. Field of Invention 
   The present invention relates to a lighter, and more particularly to a utility lighter with a safety device which defines a safety distance through which a thumb of a user&#39;s hand has to be traveled for triggering the utility lighter. 
   2. Description of Related Arts 
   A conventional utility lighter usually comprises a lighter case, a fuel-storage chamber having a gas release nozzle provided n the lighter case for storing liquefied gaseous fuel and releasing the gaseous fuel when the has release nozzle is uplifted, a piezoelectric unit, and an ignition triggering device. 
   The piezoelectric unit comprises a fixed part and a movable part movably attached thereto wherein when the movable element is depressed with respect to the fixed element, a piezoelectric spark will be generated for ignition. 
   The ignition triggering device comprises a trigger button slidably mounted on the lighter case and operatively communicated with the piezoelectric unit, and a lever pivotally communicating the gas release nozzle with the trigger button in such a manner that when the trigger button is slidably depressed, the lever will pivotally uplift the gas release nozzle so as to release the gaseous fuel. Simultaneously, the movable part of the piezoelectric unit is depressed wherein gaseous fuel coming out from the gas release nozzle is arranged to be ignited by the piezoelectric spark generate from the piezoelectric unit. 
   The major disadvantage of the conventional utility lighter is too easy and convenient for the user to ignite. Essentially, the user needs only to depress the trigger button in order to ignite the lighter. Thus, one can conceive that even a child can ignite the lighter without any difficulty. 
   This may lead to an extremely disastrous consequence. For example, the child may burn himself/herself by curiously igniting the lighter. What&#39;s worse is that when the fire accidentally ignite something, it may cause a large-scale fire. 
   Admittedly, a lot of conventional piezoelectric lighters have been further developed as comprising some sorts of safety devices so as to prevent undesired or accidental ignition. However, as a general phenomenon, the greater the complexity of the safety device, the more effective the prevention of accidental ignition, yet the more inconvenience when the user tries to ignite the lighter. As a result, there a considerable number of piezoelectric lighters wherein their safety devices are so effective in preventing accidental ignition yet also effective in discouraging people using them because of the intolerably inconvenience for utilizing them. 
   Obviously, as a matter of fact, there exist a considerable amount of utility lighters wherein their safety devices are convenient to operate so that people are more willing to use them. However, very often, those safety devices so easy to operate that even a child can ignite the utility lighter without much difficulty. Although it can not be said that those safety devices are of no use, their practical utility value are undeniably very limited. 
   As a result, a very difficult balance has to be struck between inconvenience and ineffectiveness of the safety devices. As children tend to learn fast, it is indeed very hard to prevent them from understanding how a safety device functions thus effectively prohibiting accidental ignition by children. 
   Poor handling of such issues will lead to a result that neither convenient operation of the utility lighters nor effective prevention of accidental and undesirable ignition could be achieved. 
   SUMMARY OF THE PRESENT INVENTION 
   A main object of the present invention is to provide a utility lighter, which comprises a safety device for locking the ignition operation of the utility lighter, such that the utility lighter requires two continuous actions, namely, vertically rotating a safety rotor and opposedly pushing the pusher button, in order to ignite the utility lighter. 
   Another object of the present invention is to provide a utility lighter comprising a safety device which defines a safety distance which an adult user&#39;s thumb has to move before he/she can be able to ignite the utility lighter. In other words, because a child&#39;s thumb, being smaller in size as compared with an adult&#39;s thumb, is incapable of moving through the whole safety distance, therefore he/she is prevented from igniting the lighter. 
   Another object of the present invention is to provide a utility lighter comprising a safety device which comprises a resilient element normally applying an urging force to the safety rotor such that it is normally locked in a locked position. Moreover, the urging force is of such a magnitude that an ordinary child is incapable of overcoming so as to prevent an ordinary child to unlock the utility lighter. 
   Another object of the present invention is to provide a utility lighter comprising a safety device which does not employ any complicated and expensive mechanical components so as to minimize the manufacturing cost and the ultimate selling price of the present invention. 
   Accordingly, in order to accomplish the above objects, the present invention provides a utility lighter, comprising: 
   a lighter housing having a fuel-storage cavity for storing a liquefied gas therein, an ignition cavity, an operation cavity, and an operation slot formed on the lighter housing to communicate the operation cavity to outside; 
   a gas valve upwardly extended from the fuel-storage cavity for release the gas therein when the gas valve is uplifted; 
   an ignition nozzle supported in the ignition cavity and communicated with the gas valve; 
   a piezoelectric unit disposed in the ignition cavity for generating piezoelectricity, wherein the piezoelectric unit has a movable part and a spark generating tip extended towards the ignition nozzle in such a manner that when the piezoelectric unit is compressed, a spark is generated at the spark generating tip for igniting the emitted gas through the ignition nozzle; and 
   a safety device, which comprises: 
   a pusher button slidably mounted on the lighter housing along the operation slot, wherein the pusher button is adapted to vertically slide along the lighter housing by the pusher button to lift up the gas valve and to compress the piezoelectric unit at the same time; 
   a restraining latch transversely extended in the operation cavity; 
   a safety rotor, having a blocking latch, rotatably connected within the pusher button to move between a locked position and an unlocked position, wherein at the locked position, the blocking latch of the safety rotor is aligned with the restraining latch to lock up the pusher bottom from sliding upwardly, and at the unlocked position, the safety rotor is rotated at a direction opposite to a sliding movement of the pusher button to drive the blocking latch offset from the restraining latch, such that the pusher bottom is adapted to slide to ignite the utility lighter; and 
   a resilient element supported within the operation cavity of the lighter housing to retain the safety rotor at the locked position. 
   These and other objectives, features, and advantages of the present invention will become apparent from the following detailed description, the accompanying drawings, and the appended claims. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is an exploded perspective view of a utility lighter according to a first preferred embodiment of the present invention. 
       FIG. 2  is a sectional view of the utility lighter according to the above first preferred embodiment of the present invention. 
       FIG. 3  is a sectional view of the utility lighter according to the above first preferred embodiment of the present invention, illustrating the utility lighter being ignited. 
       FIG. 4  illustrates an alternative mode of the safety device of the utility lighter according to the above first preferred embodiment of the present invention. 
       FIG. 5  is a sectional view of a utility lighter according to a second preferred embodiment of the present invention. 
       FIG. 6  is a sectional view of the safety device of the utility lighter according to the above second preferred embodiment of the present invention. 
       FIG. 7  illustrates an alternative mode of the safety device of the utility lighter according to the above second preferred embodiment of the present invention. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
   Referring to  FIG. 1  of the drawings, a utility lighter according to a preferred embodiment of the present invention is illustrated, in which the utility lighter comprises a lighter housing  10 , a gas valve  20 , an ignition nozzle  30 , a piezoelectric unit  40 , and a safety device  50 . 
   The lighter housing  10  has a fuel-storage cavity  12  for storing liquefied gas therein, an ignition cavity  13 , and an operation cavity  14 , wherein an operation slot  11  is formed on the lighter housing  10  so as to communicate the operation cavity  14  with an outside of the lighter housing  10 . 
   The utility lighter,  1  as shown in  FIG. 1 , is embodied as a barbecue lighter wherein the lighter housing  10  is an elongated housing that the bottom portion thereof forms as the fuel-storage cavity  12  and the upper portion forms as the ignition cavity  13  while the operation cavity  14  is formed between the fuel-storage cavity  12  and the ignition cavity  13 . 
   The fuel-storage cavity  12  is adapted to be fueled with liquefied gas which is to be utilized to provide flame when properly ignited. The gas valve  20  is upwardly extended from the fuel-storage cavity  12  in such a manner that when it is uplifted, the liquefied gas stored in the fuel-storage cavity  12  will be released through the gas valve  20 . 
   The ignition nozzle  30  is securely supported in the ignition cavity  13  of the lighter housing  10  of the utility lighter which further comprises a gas tube  60  communicating the ignition nozzle  30  and the gas valve  20 , therefore, when the gas valve  20  is uplifted, the liquefied gas will be released and go to the ignition nozzle  30  via the gas tube  60 . 
   The piezoelectric unit  40  is disposed in the ignition cavity  13  for generating piezoelectricity, wherein the piezoelectric unit  40  has a main body  41  mounted underneath the ignition nozzle  30 , a movable part  42  slidably extended from the main body  41  and a spark generating tip  43  extended from the main body  41  towards the ignition nozzle  30  in such a manner that when the movable part  42  of the piezoelectric unit  40  is compressed, a spark will be generated at the spark generating tip  43  for igniting the liquefied gas coming out from the ignition nozzle  30 . 
   The safety device  50  comprises a pusher button  51 , a restraining latch  52 , a safety rotor  53 , and a resilient element  54 . The pusher button  51 , having a pusher portion  510  extended outwardly, is slidably mounted along the operation slot  11 , and is adapted to vertically slide along the lighter housing  10  so as to lift up the gas valve  20  via a gas lever and to compress the piezoelectric unit  40  simultaneously. In other words, by pushing the pusher portion  510  of the pusher button  51 , the utility lighter is arranged to be ignited. 
   Referring to  FIG. 2  of the drawings, according to the preferred embodiment, the pusher button  51  comprises a transmission member  511  slidably supported in the operation cavity  14 , and an actuation member  512 , defining the pusher portion  510  thereon, outwardly extended from the transmission member  511  through the operation slot  11 . In other words, by upwardly pushing the actuation member  512  from outside the lighter housing  10 , the actuation member  512  is arranged to drive the transmission member  511  slidably and upwardly moving as well, thereby simultaneously uplifting the gas valve  20  and pressing the piezoelectric unit  40  for igniting the liquefied gaseous fuel coming out from the ignition nozzle  30 . 
   The transmission member  511  has a body, an upper pressing end engaged with the movable part  42  of the piezoelectric unit  40 , and a lower uplifting end operatively engaged with the gas valve  20  such that when the pusher portion  510  of the actuation button  512  is pushed upwardly, the transmission member  511  is driven upwardly to uplift the gas valve  20  and to compress the piezoelectric unit  40 . As a result, the liquefied gas stored in the fuel-storage cavity will be released through at the ignition nozzle via the gas tube  60 . At the same time, the upper pressing end portion is arranged to push to press the movable part  42  of the piezoelectric unit  40  so as to generate a spark at the ignition tip  43 . 
   It is worth to mention that the movable part  42  is downwardly extended from the main body  41  to bias against the upper end of the transmission member  511  such that when the transmission member  511  is pushed upwardly, the movable part  42  is driven to move upwardly to the main body  41  so as to compress the piezoelectric unit  40 . 
   The actuation member  512  has an outer engaging surface  5121  adapted for receiving a user&#39;s thumb resting thereon. Preferably, a plurality of anti-sliding teeth are formed on the engaging surface  5121  so that the engaging surface  5121  is capable of securely engaging with the user&#39;s thumb when it tries to push the pusher button  51  upwardly to ignite the utility lighter. 
   Referring to  FIG. 2  and  FIG. 3  of the drawings, the safety rotor  53 , having a blocking latch  531 , is rotatably mounted within a pusher cavity  500  of the pusher button  51  for moving between a locked position and an unlocked position, wherein in the locked position, the blocking latch  531  is substantially align with the restraining latch  52  so as to lock up the pusher button  51  from sliding upwardly (as shown in  FIG. 2  of the drawings), and in the unlocked position, the safety rotor  53  is rotated at a direction opposite to the sliding movement of the pusher button  51 , i.e. the downward direction, to drive the blocking latch  531  offset from the restraining latch  52 , i.e. disaligning therefrom, such that the pusher button  51  is adapted to slidably move for igniting the utility lighter (as shown in  FIG. 3  of the drawings). 
   According to the preferred embodiment, the safety rotor  53  is rotatably mounted on the pusher button  51  to define a thumb distance between the safety rotor  53  and the pusher portion  510  of the actuation member  512 , wherein the thumb distance of the safety device  50  is configured for fitting an adult&#39;s thumb size which is big enough to downwardly rotate the safety rotor  53  and to upwardly lift up the pusher button  51  in one sequential manner while a child&#39;s thumb size is small to insufficiently reach the safety rotor  53  and the pusher portion  510  of the actuation member  512  at the same time. 
   The safety rotor  53  is rotatably mounted at the transmission member  511  between the upper and lower ends thereof, has a curved manipulating portion  530  outwardly protruded from the actuation member  512  in such a manner that when the manipulating portion  530  of the safety rotor  53  is rotated to drive the blocking latch  531  offset from the restraining latch  52 , the actuation member  512  is allowed to drive the transmission member  511  to slide upwardly to ignite the utility lighter. 
   Moreover, a plurality of engaging teeth is also formed on the safety rotor  53  wherein the user&#39;s thumb can be able to securely engage with the safety rotor  53  for rotating it from the locked position to the unlocked position and then to push the pusher button  51  though the actuation member  512 . 
   Accordingly, the restraining latch  52  is transversely extended in the operation cavity  14  and has a slanted guiding surface  521  formed at a free end of the restraining latch  52  to guide the blocking latch  531  of the safety rotor  53  to slide back to the locked position when the pusher button  51  is downwardly slid on the lighter housing  10 . It is worth to mention that the restraining latch  52  is utilized to restraint an upward movement of the pusher button  51  so as to prevent the utility lighter from being accidentally or undesirably ignited as disclosed below. 
   The resilient element  54  is supported within the operation cavity  14  of the lighter housing  10  for retaining the safety rotor  53  at the locked position. The transmission member  511  further has a securing slot  5111  formed at an inner side thereof within the operation cavity  14  wherein the resilient element  54  has a biasing end portion and a securing end portion securely mounted in the securing slot  5111  of the transmission member  511  to substantially support the biasing end portion of the resilient element  54  to bias against the safety rotor  53  so as to retain the safety rotor  53  in the locked position. 
   According to the preferred embodiment, the resilient element  54  is embodied as a spring strip having a predetermined safety elastic strength which is arranged to normally apply an urging force to the safety rotor  53  so as to retain the safety rotor  53  in the locked position. Alternatively, the spring strip of the resilient element  54 A is a coil spring having a biasing end portion and a securing end portion securely mounted in the securing slot  5111  of the transmission member  511  to substantially support the biasing end portion of the resilient element  54 A to bias against the safety rotor  53 A so as to retain the safety rotor  53 A in the locked position, as shown in  FIG. 4 . 
   It is worth mentioning that the safety elastic strength of the resilient element  54  is such as to be sufficiently strong for overcome a rotating force which can be applied thereto by an ordinary child. In other words, it is intended that the ordinary child is unable to rotate the safety rotor  53  because of the strong resisting force applied thereto by the resilient element  54 . In other words, the resilient element  54  is arranged to normally retain the safety rotor  53  in the locked position for resisting a child&#39;s thumb from rotating the safety rotor  53  to the unlocked position. 
   Moreover, the safety rotor  53  further has a retaining stopper  532  which is extended integrally to bias against the resilient element  54  and is arranged to block up a further rotational movement of the safety rotor  53  at a position that the blocking latch  531  is aligned with the restraining latch  52  so as to retain the safety rotor  53  at the locked position. As shown in  FIG. 2 , the retaining stopper  532  is embodied as a stopper arm integrally extended to have a first side biasing against the resilient element  54  and a second side biasing against the transmission member  511 . Accordingly, after every ignition, the safety rotor  53  is forced to rotate back by the resilient element  54  such that the retaining stopper  532  is arranged to stop the further rotational movement of the safety rotor  53  to ensure the alignment between the blocking latch  531  and the restraining latch  52 . Alternatively, the retaining stopper  532 A is attached to the safety rotor  53 A at a position that the retaining stopper  532 A is biased against the transmission member  511  to stop the further rotational movement of the safety rotor  53 A, as shown in  FIG. 4 . 
   In addition, the safety rotor  53 A is rotatably mounted at a position above the pusher portion  510 A of the actuation member  512 A such that the user must downwardly rotate the safety rotor  53 A to remain the blocking latch  531 A at a position that offset from the restraining latch  52  such that the pusher portion  510 A is allowed to push upwardly to ignite the utility lighter, as shown in  FIG. 4 . 
   The operation of the utility lighter is explained as follows: the safety rotor  53  is normally retained in the locked position by the resilient element  54 . When the user wants to actuate the utility lighter, two principal steps must be taken. First, he/she has to downwardly rotate the safety rotor  53  such that the blocking latch  531  is rotated to disalign with the restraining latch  521 . At the same time, the retaining stopper  532  is driven to bias against an upper end portion of the resilient element  54  for overcoming the normal urging force applied to the safety rotor  53 . As such, the safety rotor  53  is cleared from obstructions for sliding upwardly along the operation slot  11 . In other words, the safety rotor  53  is rotated to the unlocked position. 
   Second, when the safety rotor  53  is in the unlocked position, the user has to retain the safety rotor  53  in the unlocked position and at the same time push the pusher button  51  upwardly along the operation slot  11  until the gas valve  20  is uplifted and the piezoelectric unit  40  is compressed, thereby producing a spark at the ignition nozzle  30  at which the liquefied gas is coming out. The consequence is that the liquefied gas will be ignited and lighter flame is generated. 
   To summarize, in order for a user to ignite the utility lighter, the user has to move his/her thumb a safety distance its constituents being the sum of the distance in rotating the safety rotor  53  from the locked position to the unlocked position, and the distance for pushing the pusher button  51  up to ignite the utility lighter. Nothing short of that safety distance is sufficient to ignite the utility lighter. 
   With respect to this, it is important to point out that the safety distance is arranged to be traveled by an adult&#39;s thumb and that for a child&#39;s thumb which is usually smaller in size, it is incapable of accomplishing the whole safety distance thereby igniting the utility lighter. 
   When the user finishes using the utility lighter, he/she only needs to release the upward pushing force applied to the pusher button  51  and the rotating force applied to the safety rotor  53 . Then, the piezoelectric unit  40  will rebound back to its original position, thus downwardly pushing the pusher button  51  back to its original position, and the resilient element  54  will apply the normal urging force to the retaining stopper  532  of the safety rotor  53  so as to push the safety rotor  53  rotating back to the locked position. 
   Furthermore, the slanted guiding surface  521  of the restraining latch  52  will guide the pusher button  51  moving into the original position. 
   Referring to  FIG. 5  of the drawings, the utility lighter according to a second embodiment illustrates an alternative mode of the first embodiment of the present invention, wherein the utility lighter according to the second embodiment is embodied as a piezoelectric lighter. 
   The utility lighter comprises a lighter housing  10 ′, a gas valve  20 ′, an ignition nozzle  30 ′, a piezoelectric unit  40 ′, and a safety device  50 ′. The lighter housing  10 ′ has a fuel-storage cavity  12 ′ for storing liquefied gas therein, an ignition cavity  13 ′, and an operation cavity  14 ′, wherein an operation slot  11 ′ is formed on the lighter housing  10 ′ so as to communicate the operation cavity  14 ′ with an outside of the lighter housing  10 ′. 
   The gas valve  20 ′ is upwardly extended from the fuel-storage cavity  12 ′ in such a manner that when it is uplifted, the liquefied gas stored in the fuel-storage cavity  12 ′ will be released through the gas valve  20 ′. 
   The ignition nozzle  30 ′ is securely supported in the ignition cavity  13 ′ of the lighter housing  10 ′ which further comprises a gas tube  60 ′ communicating the ignition nozzle  30 ′ and the gas valve  20 ′, therefore, when the gas valve  20 ′ is uplifted, the liquefied gas will be released and go to the ignition nozzle  30 ′ via the gas tube  60 ′. 
   The piezoelectric unit  40 ′ is disposed in the ignition cavity  13 ′ for generating piezoelectricity, wherein the piezoelectric unit  40 ′ has a main body  41 ′ mounted underneath the ignition nozzle  30 ′, a movable part  42 ′ slidably extended from the main body  41 ′ and a spark generating tip  43 ′ extended from the main body  41 ′ towards the ignition nozzle  30 ′ in such a manner that when the movable part  42 ′ of the piezoelectric unit  40 ′ is compressed, a spark will be generated at the spark generating tip  43 ′ for igniting the liquefied gas coming out from the ignition nozzle  30 ′. 
   The safety device  50 ′ comprises a pusher button  51 ′, a restraining latch  52 ′, a safety rotor  53 , and a resilient element  54 ′. The pusher button  51 ′, having a pusher portion  510 ′ extended outwardly, is slidably mounted along the operation slot  11 ′, and is adapted to vertically slide along the lighter housing  10 ′ so as to lift up the gas valve  20 ′ and to compress the piezoelectric unit  40 ′ simultaneously. In other words, by pushing the pusher portion  510 ′ of the pusher button  51 ′, the utility lighter is arranged to be ignited. 
   As shown in  FIG. 6 , the pusher button  51 ′ comprises an actuation arm  511 ′ extended into the operation cavity  14 ′ at a position on top of the movable part  42 ′ of the piezoelectric unit  40 ′ such that when the pusher button  51 ′ is slid downwardly, the piezoelectric unit  40 ′ is depressed to generate the spark at the spark generating tip  43 ′. At the same time, the downward sliding movement of the pusher button  51 ′ will lift up the gas valve  20 ′ via a gas lever  21 ′. 
   The safety rotor  53 ′, having a blocking latch  531 ′, is rotatably mounted within a pusher cavity  500 ′ of the pusher button  51 ′ for moving between a locked position and an unlocked position, wherein at the locked position, the blocking latch  531 ′ of the safety rotor  53 ′ is substantially align with the restraining latch  52 ′ so as to lock up the pusher button  51 ′ from sliding downwardly. At the unlocked position, the safety rotor  53 ′ is rotated at a direction opposite to the sliding movement of the pusher button  51 ′, i.e. the upward direction, to drive the blocking latch  531 ′ offset from the restraining latch  52 ′, i.e. disaligning therefrom, such that the pusher button  51 ′ is adapted to slidably move for igniting the utility lighter. 
   As shown in  FIG. 6 , the restraining latch  52 ′ is formed at a bottom edge of the operation slot  11 ′ such that the blocking latch  531 ′ is normally positioned above the restraining latch  52 ′ so as to block the downward sliding movement of the pusher button  51 ′ to ignite the utility lighter. When the safety rotor  53 ′ is upwardly rotated to drive the blocking latch  531 ′ out of the operation slot  11 ′ that offsets from the restraining latch  52 ′, the pusher button  51 ′ is allowed to slide downwardly to ignite the utility lighter. 
   According to the second embodiment, the pusher cavity  500 ′ is formed at the pusher portion  510 ′ of the pusher button  51 ′ to communicate with the operation slot  11 ′, wherein the safety rotor  53 ′ is rotatably supported within the pusher cavity  500 ′ such that when the safety rotor  53 ′ is rotated at the unlocked position, the pusher portion  510 ′ of the pusher button  51 ′ is allowed to be pushed downwardly so as to enhance the practice use of the utility lighter. 
   The safety rotor  53 ′ has a curved manipulating portion  530 ′ outwardly protruded from the pusher cavity  500 ′ such that the adult user&#39;s thumb is able to easily contact with the manipulating portion  530 ′ of the safety rotor  53 ′ to unlock the utility lighter. 
   Alternatively, the manipulating portion  530 ″ of the safety rotor  53 ′ is positioned below an outer wall of the pusher cavity  500 ′ to define a safety clearance S such that the adult user must deform his or her thumb to contact with the manipulating portion  530 ″ of the safety rotor  53 ′ in order to unlock the utility lighter so as to enhance the safety feature of the utility lighter, as shown in  FIG. 7 . 
   The safety rotor  53 ′ further has a retaining stopper  532 ′ extended within the pusher cavity  500 ′ to bias against an inner wall thereof so as to block up a further rotational movement of the safety rotor  53 ′ to retain the safety rotor  53 ′ at the locked position. 
   The resilient element  54 ′ is supported within the pusher cavity  500 ′ of the pusher button  51 ′ for retaining the safety rotor  53 ′ at the locked position. The resilient element  54 ′ is embodied as a coil spring having two ends biasing against the pusher button  51 ′ and the inner wall of the pusher cavity  500 ′ respectively so as to retain the safety rotor  53 ′ in the locked position, as shown in  FIG. 6 . 
   Accordingly, the coil spring of the resilient element  54 ′ is substantially mounted to the safety rotor  53 ′ wherein the two ends of the resilient element  54 ′ is arranged to bias against the retaining stopper  532 ′ of the safety rotor  53 ′ and the inner wall of the pusher cavity  500 ′ such that the coil spring of the resilient element  54 ′ normally applies an urging force against the safety rotor  53 ′ so as to retain the safety rotor  53 ′ at the locked position. 
   One skilled in the art will understand that the embodiment of the present invention as shown in the drawings and described above is exemplary only and not intended to be limiting. 
   It will thus be seen that the objects of the present invention have been fully and effectively accomplished. It embodiments have been shown and described for the purposes of illustrating the functional and structural principles of the present invention and is subject to change without departure from such principles. Therefore, this invention includes all modifications encompassed within the spirit and scope of the following claims.