Abstract:
A diagnostic tool for a vehicle, includes a signal translator communicating with the vehicle in at least one protocol, an input unit for inputting information, a processor controlling a software according to the input information from the input unit and communication with the vehicle from the signal translator, the processor controlling a reception of diagnostic data of the vehicle through the signal translator, an input and output unit receiving and transmitting audio and video signals controlled by the processor, a memory storing a software controlled by the processor, the memory storing audio and video information, and transferring the audio and video information through the input and output unit; and a display unit displaying information according to the received and processed audio and video signals stored in the memory.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to and is a Continuation of application Ser. No. 12/977,241, filed on Dec. 23, 2010, U.S. Pat. No. 8,108,093 which is claims priority to and is a Continuation of application Ser. No. 11/709,824, filed on Feb. 23, 2007, U.S. Pat. No. 7,860,619 the entire contents of which are incorporated herein by their reference. 
    
    
     FIELD OF THE INVENTION 
     The present invention relates generally to an automotive diagnostic tool. More particularly, the present invention relates to an automotive diagnostic tool having advanced audio, video and voice-recognition capabilities. 
     BACKGROUND OF THE INVENTION 
     Onboard control computers have become prevalent in motor vehicles, but as safety, economy, and emissions requirements have continued to tighten, friction braking systems, and traction control devices have not met the requirements set out in government regulations and the implicit demands of competitors&#39; achievements. Successive generations of onboard control computers have acquired increasing data sensing and retention capability as the electronics have advanced. 
     Present external diagnostic and display apparatus, known as diagnostic tools, are commonly limited to reporting the data acquired by the onboard control computer itself. Increasingly, subtle subsystem failures in vehicles overload the ability of maintenance technicians, not simply to read the faults detected and stored by the diagnostic tools themselves, but to combine those readings with peripheral measurements and deduce corrective actions with both speed and accuracy. 
     Currently in the automotive industry, there are both stand alone and hand-held diagnostic testers or tools used in connection with motor vehicle maintenance and repair. For example, hand-held diagnostic tools have been used to trouble-shoot faults associated with vehicular control units. Diagnostic tools detect faults based on Diagnostic Trouble Codes or DTCs that are set in the vehicle&#39;s onboard control computer. A DTC can be triggered and stored when there is a problem with the vehicle. A technician then retrieves the DTC using a diagnostic tool, repairs the associated problem and then deletes the DTC from the vehicle&#39;s computer. 
     The current diagnostic tools are limited in the input and output multimedia capabilities, thus limiting the usefulness of the diagnostic tool for a user. The limits on the current tools output capabilities include, for example, problems with the method of indicating the DTC. The current diagnostic tools show the DTC on a basic display that is capable of viewing only when a user directly looks at the diagnostic tool. The user must be in close proximity and in viewing distance from the diagnostic tool. For example, when a diagnostic tool detects a DTC, a user must directly view the tool in order to see the DTC readout. If a user is unable to view or has difficulty in seeing the diagnostic tool, there is a problem with obtaining the readout on the tool. There is a need to remotely use the diagnostic tool that present tools are unable to provide. The limitations of the output methods of today&#39;s diagnostic tools, creates certain burdens upon the user including the limited manners of receiving the DTC output of the diagnostic tools. 
     The current diagnostic tool limitations of input capabilities stem from sparse input methods. A user has to enter instructions through a keypad of the diagnostic tool. Therefore, the user must again be in close proximity to the diagnostic tool in order to enter instructions and additional data. Further, additional data may also be limited to interfaces such as a keypad. Such methods are slow and cumbersome when a plurality of instructions and data have to be entered quickly and accurately. Again, the present diagnostic tools do not include the remote capability in terms of the input of information. 
     The user of the diagnostic tool can be forced to use additional devices in order to supplement the limitations of the input and output methods of today&#39;s diagnostic tools. For example, if the diagnostic tool cannot perform a certain function because of the limitations in input or output, then a second device that does include the missing capabilities must be used. Further, a user is forced to receive help from a second user. For example, if the user cannot read the diagnostic tool, a second user may have to read the information and relay it to the user. 
     Accordingly, it is desirable to provide a method and apparatus that will allow enhanced capabilities to a user or technician to use a diagnostic tool to determine the output of the diagnostic tool and to input information into the diagnostic tool in a remote manner with respect to multimedia related information. 
     SUMMARY OF THE INVENTION 
     The foregoing needs are met, to a great extent, by the present invention, wherein in one aspect a technique and apparatus are provided that will allow a technician to use a diagnostic tool to determine the nature of a problem, with enhanced input and output capabilities by providing multimedia capabilities including enhanced audio, video and voice-recognition. 
     In accordance with one embodiment of the present invention, a diagnostic tool for diagnosing a vehicle is provided, which can comprise an audio input interface configured to receive a verbal instruction to perform a function on the diagnostic tool, a connector interface configured to allow the diagnostic tool to communicate with the vehicle, a signal translator configured to condition data received through the connector interface by converting the data from an input format to a predetermined format, and a processor configured to process the conditioned data in the predetermined format and provide information to a user in a voice simulated format. 
     in accordance with another embodiment of the present invention, a diagnostic tool for diagnosing a vehicle is provided, which can comprise means for receiving a verbal instruction to perform a function on the diagnostic tool, means for interfacing the diagnostic tool with the vehicle, means for conditioning data received through the means for interfacing by converting the data from an input format to a predetermined format, and means for processing the conditioned data in the predetermined format and provide information to a user in a voice simulated format. 
     In accordance with yet another aspect of the present invention, a method of diagnosing a vehicle, which can comprise receiving a verbal instruction from a user through an audio input interface of a diagnostic tool to perform a diagnostic task on the vehicle, transmitting through a connector interface of the diagnostic tool an instruction from the diagnostic tool to the vehicle to execute the diagnostic task, receiving data resulting from the diagnostic task from the vehicle in an input format, conditioning the data received from the vehicle with a signal translator of the diagnostic tool by converting the input format to a predetermined format, processing with the processor the conditioned data in the predetermined format, and outputting diagnostic information to a user in a voice simulated format. 
     There has thus been outlined, rather broadly, certain embodiments of the invention in order that the detailed description thereof herein may be better understood, and in order that the present contribution to the art may be better appreciated. There are, of course, additional embodiments of the invention that will be described below and which will form the subject matter of the claims appended hereto. 
     In this respect, before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and to the arrangements of the components set forth in the following description or illustrated in the drawings. The invention is capable of embodiments in addition to those described and of being practiced and carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein, as well as the abstract, are for the purpose of description and should not be regarded as limiting. 
     As such, those skilled in the art will appreciate that the conception upon which this disclosure is based may readily be utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present invention. It is important, therefore, that the claims be regarded as including such equivalent constructions insofar as they do not depart from the spirit and scope of the present invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a front view illustrating a diagnostic tool according to an embodiment of the invention. 
         FIG. 2  is a block diagram of the components of a diagnostic tool. 
         FIG. 3  is a block diagram of a diagnostic tool accommodating video input in accordance with one embodiment of the invention. 
         FIG. 4  is a block diagram of the diagnostic tool communicating with a personal computer in a remote location. 
         FIG. 5  is a block diagram of the diagnostic tool accommodating input/output of audio and video signals in another embodiment of the invention. 
     
    
    
     DETAILED DESCRIPTION 
     The invention will now be described with reference to the drawing figures, in which like reference numerals refer to like parts throughout. An embodiment in accordance with the present invention provides an apparatus and method that will allow a user, such as a technician, to use a diagnostic tool to determine the nature of a problem, and the tool having enhanced audio, video and voice-recognition capabilities. 
     Manufacturers have programmed their vehicle onboard computers with complicated methods of detecting a variety of problems. Further, the United States Environmental Protection Agency has mandated that DTCs be set where there are emissions related problems with the vehicle using the Onboard Diagnostic II System, also known as the OBD II system. 
     However, there are still problems of using the diagnostic tool since there are limitations in the input and output methods of the diagnostic tool. A user is forced to look directly at the diagnostic tool&#39;s limited display that may display only the DTC or simple indicator of function being performed. Further, the user is also limited in the diagnostic tool&#39;s input methods such as entering instructions or information through the keypad on the diagnostic tool. 
     In an embodiment of the present invention, the diagnostic tool will run an application that accommodates a display of images taken by a digital camera unit that communicates with the diagnostic tool. The diagnostic tool can also issue audio output including voice emulated audio, thus enabling a talking mode within the diagnostic tool, in order to aid the user. In addition, the diagnostic tool is capable of voice-recognition, record and playback video and sound. Furthermore, the diagnostic tool can transmit video, sound, and other diagnostic information to a personal computer (PC) or other diagnostic equipment. The transmission of audio and video accommodates remote diagnosis of a vehicle away from the location of the vehicle. 
     An embodiment of the present inventive apparatus is illustrated in  FIG. 1 . In particular,  FIG. 1  is a front view illustrating a diagnostic tool  10  according to an embodiment of the invention. The diagnostic tool  10  can be any computing device, for example, the NEMISYS diagnostic tool from SERVICE SOLUTIONS (part of the SPX Corporation). The diagnostic tool  10  includes a housing  12  to encase the various components of the diagnostic tool  10 , such as a display  14 , a user interface  16 , a power button  18 , a memory card reader  20  and a connector interface  22 . The display  14  can be any type display, including for example but not limited to, a liquid crystal display (LCD), organic light emitting diode (OLED), field emission display (FED), electroluminescent display (ELD), etc. in addition, the LCD, for example, can be touch screen that both displays and performs the additional task of interfacing between the user and the diagnostic tool  10 . The user interface  16  allows the user to interact with the diagnostic tool  10 , in order to operate the diagnostic tool as the user prefers. The user interface  16  can include function keys, arrow keys or any other type of keys that can manipulate the diagnostic tool  10  in order to operate the diagnostic tool through the software. The user interface or input device  16  can also be a mouse or any other suitable input device for the user interface  16 , including a keypad, touchpad, etc. The user interface  16  can also include keys correlating to numbers or alphanumeric characters. Moreover, as mentioned above, when the display  14  is touch sensitive, the display  14  can supplement or even substitute for the user interface  16 . The power key or button  18  allows the user to turn the power to the diagnostic tool  10  on and off, as required. 
     A memory card reader  20  can be a single type card reader, such as, but not limited to, a compact flash card, floppy disk, memory stick, secure digital, flash memory or other type of memory. The memory card reader  20  can be a reader that reads more than one of the aforementioned memory such as a combination memory card reader. Additionally, the card reader  20  can also read any other computer readable medium, such as CD (compact disc), DVD (digital video or versatile disc), etc. 
     The connector interface  22  allows the diagnostic tool  10  to connect to an external device, such as, but not limited to, an ECU (electronic control unit) of a vehicle, a computing device, an external communication device (such as a modem), a network, etc. through a wired or wireless connection. Connector interface  22  can also include connections such as a USB (universal serial bus), FIREWIRE (Institute of Electrical and Electronics Engineers (IEEE) 1394), modem, RS232, RS48J, and other connections to communicate with external devices, such as a hard drive, USB drive, CD player, DVD player, or other computer readable medium devices. 
       FIG. 2  is a block diagram of the components of a diagnostic tool  10 . In  FIG. 2 , the diagnostic tool  10 , according to an embodiment of the invention, includes a processor  24 , a field programmable gate array (FPGA)  26 , a first system bus  28 , the display  14 , a complex programmable logic device (CPLD)  30 , the user interface  16  in the form of a keypad, a memory subsystem  32 , an internal non-volatile memory (NVM)  34 , a card reader  36 , a second system bus  38 , the connector interface  22 , and a selectable signal translator  42 . A vehicle communication interface  40  is in communication with the diagnostic tool  10  through connector interface  22  via an external cable. The connection between the vehicle communication interface  40  and the connector interface  22  can also be a wireless connection such as BLUETOOTH, infrared device, wireless fidelity (WiFi, e.g. 802.11), etc. 
     The selectable signal translator  42  communicates with the vehicle communication interface  40  through the connector interface  22 . The signal translator  42  conditions signals received from a motor vehicle control unit through the vehicle communication interface  40  to a conditioned signal compatible with the diagnostic tool  10 . The translator  42  can communicate with, for example, the communication protocols of J1850 signal, ISO 9141-2 signal, communication collision detection (CCD) (e.g., Chrysler collision detection), data communication links (DCL), serial communication interface (SCI), S/F codes, a solenoid drive, J1708, RS232, controller area network (CAN), or other communication protocols that are implemented in a vehicle. 
     The circuitry to translate a particular communication protocol can be selected by the FPGA  26  (e.g., by tri-stating unused transceivers) or by providing a keying device that plugs into the connector interface  22  that is provided by diagnostic tool  10  to connect diagnostic tool  10  to vehicle communication interface  40 . Translator  42  is also coupled to FPGA  26  and the card reader  36  via the first system bus  28 . FPGA  26  transmits to and receives signals (i.e., messages) from the motor vehicle control unit through the translator  42 . 
     FPGA  26  is coupled to the processor  24  through various address, data and control lines by the second system bus  38 . FPGA  26  is also coupled to the card reader  36  through the first system bus  28 . Processor  24  is also coupled to the display  14  in order to output the desired information to the user. The processor  24  communicates with the CPLD  30  through the second system bus  38 . Additionally, the processor  24  is programmed to receive input from the user through the user interface  16  via the CPLD  30 . The CPLD  30  provides logic for decoding various inputs from the user of diagnostic tool  10  and also provides the glue-logic for various other interfacing tasks. 
     Memory subsystem  32  and internal non-volatile memory  34  are coupled to the second system bus  38 , which allows for communication with the processor  24  and FPGA  26 . Memory subsystem  32  can include an application dependent amount of dynamic random access memory (DRAM), a hard drive, and/or read only memory (ROM). Software to run the diagnostic tool  10  can be stored in the memory subsystem  32 . The internal non-volatile memory  34  can be, but not limited to, an electrically erasable programmable read-only memory (EEPROM), flash ROM, or other similar memory. The internal non-volatile memory  34  can provide, for example, storage for boot code, self-diagnostics, various drivers and space for FPGA images, if desired. If less than all of the modules are implemented in FPGA  26 , the non-volatile memory  34  can contain downloadable images so that FPGA  26  can be reconfigured for a different group of communication protocols. 
       FIG. 3  is a block diagram illustrating one embodiment of the present invention. In particular,  FIG. 3  illustrates the communication with an image recording device such as a camera that records still images or video. The image recording device can be a digital camera  50  that is capable of recording still images, a series of still images at predetermined times, or a video. The digital camera  50  can be in circuit communication with the diagnostic tool  10 , or other automotive pass through device, via serial port, USB (universal serial bus), BLUETOOTH, etc., and transmit images back to the diagnostic tool  10  or a PC  52 , where they will be displayed. As shown in  FIG. 3 , the camera  50  can be connected to the diagnostic tool  10  or through a PC  52 . 
     The diagnostic tool  10  can be used as a pass-through device to allow the PC  52  to communicate with the vehicle  60 . The diagnostic tool  10  translates the signals from the signal translator  42  to convert the signals from the vehicle  60  to the signals of the digital camera  50  or the PC  52  to accommodate connection between the diagnostic tool  10  to a digital camera  50 , either directly or through the PC  52 . The connection between the digital camera  50  and the diagnostic tool  10  can be wired or wireless as shown above by the different methods of connection and protocols. The communication can be bi-directional with communication being transferred from the diagnostic tool  10  to the digital camera  50  and back to the diagnostic tool  10 . 
     A user can use such an apparatus as a bore scope. The user can remove a spark plug in the vehicle  60 , and then send the digital camera  50  into the spark plug hole. The bore scope can include the digital camera  50 . The user can send instructions from the diagnostic tool  10  to digital camera  50  to take certain still and/or video images of the area inside the spark plug hole of a vehicle  60 . The camera  50  then sends the image information hack to the diagnostic tool  10  for output on the display  14  of diagnostic tool  10 . The images of the cylinder are displayed either on the separate personal computer (PC)  52  or on the diagnostic tool  10 . The diagnostic tool  10  can be used to locate lost bolts, rattles on a vehicle during a road test, or provide a second set of eyes for the user. The digital camera  50  can also be used to see if a vehicle&#39;s check engine light is at an “ON” state. For example, when a user is in another location in the vehicle  60  with the diagnostic tool  10 , the digital camera  50  can be positioned to view the dashboard of a vehicle. Therefore, both time and resources can be saved, as another user is not necessary to notify the first user of the check light being on, or for the first user to move over to see the check light engine each time an adjustment is made by the first user. 
     Further, the diagnostic tool  10  can be used to count check engine light flashes for older vehicles that use manual codes instead of serial codes. Again, time and resources are saved by the diagnostic tool  10  equipped with enhanced capabilities. 
     As shown above and will be further shown in detail, the diagnostic tool accommodates remote diagnostic capability. A further example of the remote diagnostic capability of the diagnostic tool  10 , includes a vehicle being scanned in one area, state or country, while the scanned data, vehicle&#39;s engine, and live images of the testing can be viewed in near real-time or real-time, depending on transmission of data, in a remote second area, state or country. The transmission can be made for example using the Internet or other transmission means of the data. The diagnostic tool  10  can transmit such information either wirelessly (IEEE (Institute of Electrical and Electronics Engineers) 802.11) or through wired method (category 5, 6, 7 Ethernet cable where category 7 cable is for a 10 gigabit transfer) to connect to an access point such as a router or hub for the Internet. For example, the connector interface  22  can be used also to connect wirelessly or through a wired connection to the access point for network  62  connection or simply to another PC  52 . 
     As seen in the block diagram of  FIG. 4 , diagnostic tool  10  scans information of a vehicle  60  in one area, and then through a network  62  such as the internet, the information can be transmitted to the PC  52  in another area. If the distance is not too great, the IEEE 802.11 protocol or BLUETOOTH can be used to transfer information directly to the PC in a point-to-point connection or through a local area network. 
       FIG. 5  shows a block diagram of the diagnostic tool  10 , including a means for audio input. The diagnostic tool  10  can also record sound with a transducer such as a microphone  72  connected to the diagnostic tool  10  or the microphone  72  being inside the diagnostic tool. As seen in  FIG. 5 , a microphone jack  74  can be included in an input/output (I/O) port  70  or a built in transducer such as the microphone  72  accommodates the diagnostic tool to input sound information. The sound from the microphone  72  can be recorded in the non volatile memory  34  or other memory device through the card reader  36 . The processor  24  controls the recording and storage of the audio information. 
     The combination of sound and video opens up a whole new environment for scanning, diagnosing, and troubleshooting of vehicles. The diagnostic tool  10  can include line out jacks  76  in the I/O port  70 , that can be stereo amplified, so that a transducer such as a speaker can be connected directly to the diagnostic tool  10 , or a stereo headphone jack  78  can be included in the I/O  70 . An internal speaker  84  can also be included for output of the audio information. The line out jacks  76  have a set constant amplitude in the sound outputted, while the stereo headphone jack  78  can have a volume control through a variable resistor for example. The audio output of the line out jacks  76  in I/O  70  will allow the diagnostic tool to be used for training and showing tutorials. These tutorials will accommodate, for example, the user to learn to use certain functions of the diagnostic tool  10  or to learn other information with regard to the diagnostic tool  10  or its uses for example. 
     The diagnostic tool  10  can also include video output jacks  80  as seen in the I/O  70 . The diagnostic tool can be connected to the vehicle&#39;s entertainment system. A user can now show all diagnostic tool screens on the vehicle&#39;s display panel and hear all sounds through the vehicles speakers. The diagnostic tool cart play/record MP3, AVI, MPEG, WAV, MOV and other formats of sound and video files through the control of the processor  24 , while storing in the information in the non-volatile memory  34  through software running on the memory  32 . 
     The software running in the diagnostic tool  10  in the memory  32  and controlled by processor  24 , includes the process for playing and recording the audio and video information. The user can record their own sounds or select from some sounds already stored in the diagnostic tool  10  through the user interface such as the keypad  16 . The user can then have these sounds selected when certain events happen. For example, when the diagnostic tool  10  detects DTCs or certain DTCs, the diagnostic tool can play certain mp3 or “wav” format file that says “DTCs present.” The diagnostic tool can notify the user audibly for link errors or to make sure the ignition key is on, or inform the user to start the engine. The software stored in the diagnostic tool  10  can execute such preset or customized instructions. With such audio information, not only does the user not have to read the information on the diagnostic tool  10 , but the user also does not have to memorize certain tones to indicate a certain problem. The audio files will clearly notify a user without knowing ahead of time what the sound represents in terms of the diagnostic functions of the diagnostic tool  10 . 
     A diagnostic tool  10  with the audio file will talk to the user by informing clearly the notification. The diagnostic tool  10  will be able to inform user that there are DTCs present, or name (inspection and maintenance) monitors that are complete as they become complete. This allows the user to perform a drive test safely by him or herself. The diagnostic tool  10  can provide help to the user by talking to them. If the wrong key is pressed, the diagnostic tool  10  can say what key on the keypad  16  to press instead. The diagnostic tool  10  can provide a tutorial of its functions by explaining to the user what is happening on the display  14 . The diagnostic tool  10  can provide information to the user without the user having to view the display  14 . The diagnostic tool  10  can generate different sounds based on different data returned from vehicle as shown above. The audio output can be selected between speech synthesis or tone output to indicate the information from the diagnostic tool  10 , such as a read out on a sensor. 
     The diagnostic tool is also capable of providing for voice-recognition. A user can speak and the sound of the user is translated from the sound to an electrical signal through the microphone  72 . The electrical signal representing the sound is then translated by the processor  24  via the software on the memory  32 . The electrical signal from the microphone  72  is translated into data that can be used by the diagnostic tool  10  or for example but not limited to instructions performed by the diagnostic tool. With the voice recognition, the user, for example can tell the diagnostic tool  10  to turn on or off, run certain diagnostics, while the user is not in physical contact with the diagnostic tool, but in the range of detection of the sound by the microphone  72  of the diagnostic tool  10 . Again, the diagnostic tool allows for remote use of the diagnostic tool  10 . The diagnostic tool  10  can, for example, trigger a recording of information or trigger a specific event when an instruction by the user&#39;s voice command is given and recognized through the processor  24 . 
     The present invention can be realized as computer-executable instructions in computer-readable media. The computer-readable media includes all possible kinds of media in which computer-readable data is stored or included or can include any type of data that can be read by a computer or a processing unit. The computer-readable media include for example and not limited to storing media, such as magnetic storing media (e.g., ROMs, floppy disks, hard disk, and the like), optical reading media (e.g., CD-ROMs (compact disc-read-only memory), DVDs (digital versatile discs), re-writable versions of the optical discs, and the like), hybrid magnetic optical disks, organic disks, system memory (read-only memory, random access memory), non-volatile memory such as flash memory or any other volatile or non-volatile memory, other semiconductor media, electronic media, electromagnetic media, infrared, and other communication media such as carrier waves (e.g., transmission via the Internet or another computer). Communication media generally embodies computer-readable instructions, data structures, program modules or other data in a modulated signal such as the carrier waves or other transportable mechanism including any information delivery media. Computer-readable media such as communication media may include wireless media such as radio frequency, infrared microwaves, and wired media such as a wired network. Also, the computer-readable media can store and execute computer-readable codes that are distributed in computers connected via a network. The computer readable medium also includes cooperating or interconnected computer readable media that are in the processing system or are distributed among multiple processing systems that may be local or remote to the processing system. The present invention can include the computer-readable medium having stored thereon a data structure including a plurality of fields containing data representing the techniques of the present invention. 
     An example of a computer, but not limited to this example of the computer, that can read computer readable media that includes computer-executable instructions of the present invention includes a processor that controls the computer. The processor uses the system memory and a computer readable memory device that includes certain computer readable recording media. A system bus connects the processor to a network interface, modem or other interface that accommodates a connection to another computer or network such as the Internet. The system bus may also include an input and output interface that accommodates connection to a variety of other devices. 
     Although an example of the diagnostic tool is shown using a audio and video inputs and outputs, it will be appreciated that other techniques for providing the enhanced multimedia inputs and outputs are available. Also, although the diagnostic tool is useful to diagnose a vehicle and provide such information to the user in a remote manner, so that the user does not have to directly view the diagnostic tool, other diagnosing techniques can be used for other types of apparatus and systems. 
     The many features and advantages of the invention are apparent from the detailed specification, and thus, it is intended by the appended claims to cover all such features and advantages of the invention which fall within the true spirit and scope of the invention. Further, since numerous modifications and variations will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation illustrated and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the invention.