The present specification generally relates to lifting devices and, more specifically, to lift control systems for use in conjunction with lifting devices.
Lifting devices, such as patient lifts used in the health care industry, may generally comprise an actuator, such as an electric motor or similar actuator, which may be coupled to a mechanical lifting arm or cable lifting system. The actuator facilitates actuation of the mechanical lifting arm or cable lifting system thereby raising and/or lowering a load attached to the lifting arm or cable lifting system. For example, when the lifting device is a patient lift, a sling or other support apparatus may be attached to the mechanical lifting arm or cable lifting system. A patient may be positioned in the sling and a lift control system coupled to the actuator may be used by an operator to activate the actuator which, in turn, raises and/or lowers the patient by actuating the mechanical lifting arm or cable lifting system. The electrical current supplied to the actuator by the lift control system may vary depending on the weight of the patient being lifted. For example, lifting a heavier patient may require a relatively greater amount of electrical current be supplied to the actuator to facilitate lifting as compared to a relatively lighter patient.
Repeated and prolonged use of the lifting device may result in wear and/or degradation of the performance of the lifting device thus necessitating periodic maintenance. Such maintenance may include verification of the operation of the lifting device and repair or replacement of various components of the lifting device. However, the frequency and type of maintenance required may vary depending on a variety of factors including, but not limited to, the amount and frequency of use of the lifting device and the weight of the loads lifted and/or lowered with the lifting device. Such variations may not be adequately addressed through periodic maintenance.
Accordingly, a need exists for alternative lift control systems for use in conjunction with servicing and maintaining lifting devices.
According to one embodiment, a lift control system for operating a lifting device comprising a lift actuator coupled to a lift arm includes a control unit comprising a processor with a memory communicatively coupled to the processor and having computer readable and executable instructions. A battery is electrically coupled to the control unit in addition to at least one indicator. The processor executes the computer readable and executable instructions to: determine an accumulated number of initiated battery charging events; determine an accumulated number of incomplete battery charging events; determine an accumulated number of battery replacements; determine at least one operating characteristic of the lifting device and an operating time of the lifting device as the lifting device is actuated; determine an accumulated load-time parameter for the lifting device based on the at least one operating characteristic and the operating time; store the accumulated load-time parameter in the memory of the lift control system; compare the accumulated load-time parameter to a service constant; and provide an indication with the at least one indicator that a lift structural component requires service based on the comparison of the accumulated load-time parameter to the service constant.
In another embodiment, a lifting device for raising and lowering a payload coupled to the lifting device includes a lift mast mechanically coupled to a base at a first end of the lift mast and a lift arm pivotally coupled to the lift mast at a second end of the lift mast. A lift actuator is mechanically coupled to the lift mast and the lift arm such that actuation of the actuator raises or lowers the lift arm relative to the base. A lift control system is communicatively coupled to the lift actuator and includes a control unit comprising a processor and a memory having computer readable and executable instructions. At least one indicator may be electrically coupled to the control unit. The processor executes the computer readable and executable instructions to: determine at least one operating characteristic of the lifting device and an operating time of the lifting device as the lifting device is actuated; determine an accumulated load-time parameter for the lifting device based on the at least one operating characteristic and the operating time; store the accumulated load-time parameter in the memory of the lift control system; compare the accumulated load-time parameter to a service constant; and provide an indication with the at least one indicator that a lift structural component requires service based on the comparison of the accumulated load-time parameter to the service constant.
In another embodiment, a method for operating a lifting device comprising a lift actuator for raising and lowering a load coupled to the lifting device includes: determining an operating characteristic of the actuator as the actuator is actuated; determining an operating time of the actuator as the actuator is actuated; determining an accumulated load-time parameter for the actuator based on the operating characteristic and the operating time; comparing the accumulated load-time parameter to a service constant indicative of a structural component of the lifting device requiring service; activating an indicator when the accumulated load-time parameter is greater than the service constant; and servicing a structural component of the lifting device when the indicator is activated.
These and additional features provided by the embodiments of the present invention will be more fully understood in view of the following detailed description, in conjunction with the drawings.
The embodiments set forth in the drawings are illustrative and exemplary in nature and not intended to limit the inventions defined by the claims. The following detailed description of the illustrative embodiments can be understood when read in conjunction with the following drawings, where like structure is indicated with like reference numerals and in which:
Still referring to
Referring now to
In one embodiment, the base 102 may further comprise a mast support 122 disposed on the cross support 132. In one embodiment, the mast support 122 may be a rectangular receptacle configured to receive the lift mast 104 of the lifting device. For example, a first end of the lift mast 104 may be adjustably received in the mast support 122 and secured with a pin, threaded fastener, or a similar fastener coupled to the adjustment handle 124. The pin or threaded fastener extends through the mast support 122 and into a corresponding adjustment hole(s) (not shown) on the lift mast 104. Accordingly, it will be understood that the position of the lift mast 104 may be adjusted vertically (e.g., in the +/−Z direction on the coordinate axes shown in
The lifting device 100 may further comprise a lift arm 106 which is pivotally coupled to the lift mast 104 at the lift arm pivot 138 at a second end of the lift mast such that the lift arm 106 may be pivoted (e.g., raised and lowered) with respect to the base 102.
In the embodiments described herein, the lifting device 100 is a mechanized lifting device. Accordingly, raising and lowering the lift arm 106 with respect to the base 102 may be achieved using an actuator such as a lift actuator 204. In the embodiments shown, the lift actuator 204 is a linear actuator which comprises a motor 110 mechanically coupled to an actuator arm 114. More specifically, the motor 110 may comprise a rotating armature (not shown) and the actuator arm 114 may comprise one or more threaded rods coupled to the armature such that, when the armature is rotated, the threaded rods are extended or retracted relative to one another and the actuator arm 114 is extended or retracted. In the embodiment shown in
The lift actuator 204 may further comprise one or more limit switches coupled to the actuator arm 114. For example, the actuator arm 114 may comprise an upper limit switch (not shown) and a lower limit switch (not shown) which are mechanically coupled to the actuator arm 114 and electrically coupled to a control unit 202. The upper limit switch may provide the control unit 202 of the lifting device 100 with an electrical signal indicating that the actuator arm is fully extended (i.e., at an upper end position) while the lower limit switch may provide the control unit 202 with an electrical signal indicating that the actuator arm 114 is fully retracted (i.e., at a lower end position), as will be described in more detail herein.
In the embodiment shown in
Still referring to
It should be understood that, the term “service,” as used herein, refers to the inspection, maintenance or replacement of a structural component of the lifting device or an electrical component of the lifting device. Further, it should also be understood that the phrase “structural component” refers to the mechanical and structural components of the lifting device including, without limitation, the lift arm, the mast support, the lift mast, the base, the cross support, the base leg, the base leg pivot, the front castors, the rear castors, the castor brakes, the lift mast adjustment handle and associated fastener, the lift arm pivot, the actuator pivot, the attachment coupling, the attachment pivot, the bracket of the lift mast and/or combinations thereof. It should also be understood that the phrase “electrical component” refers to the lift actuator, the base actuator, the various components of the lift control system, and/or various components thereof.
While the embodiments described herein refer to the lift actuator 204 as comprising a motor 110 and an actuator arm 114, it will be understood that the actuator may have various other configurations and may include a hydraulic or pneumatic actuator comprising a mechanical pump or compressor or a similar type of actuator. Further, in other embodiments, where the lifting device is a cable-based lift system, the actuator may be a motor which pays out and/or takes-up cable thereby raising and/or lowering an attached load. Accordingly, it will be understood that various other types of actuators may be used to facilitate raising and lowering the lift arm and/or an attached load with respect to the base 102.
Moreover, while
The lift control system 200 of the lifting device 100 will now be described in more detail with reference to
Referring now to
The control unit 202 may generally comprise a central processing unit (“CPU”) and associated electrical components, including, without limitation, a processor (not shown) and at least one memory (not shown). The memory includes a set of computer readable and executable instructions which the processor executes to control the lifting device. Utilizing the computer readable and executable instructions, the control unit 202 is operable to output a control signal to the lift actuator 204 and/or the base actuator 206 based on input signals received from the wireless hand control 210, the wired controller 212, and/or the diagnostic monitor/control 208.
The one or more indicators provide an operator of the lifting device 100 with an indication of the status of various components and/or systems of the lifting device. In one embodiment, the at least one indicator comprises a visual indicator such as an LED or similar lamp capable of providing an operator with a visual indication. Alternatively, the at least one indicator may comprise an audible indicator, such as a speaker or similar device capable of producing an audible signal.
In one embodiment, the first indicator 203A may be indicative of the control unit communicating with a wireless controller, such as the wireless hand control 210 or the diagnostic monitor/control 208. When the indicator is activated, the control unit 202 is receiving a signal from the wireless controller and/or sending a signal to the wireless controller.
The second indicator 203B may be indicative of an overload condition in the lift actuator, such as when the load on the lifting device 100 exceeds a pre-programmed load limit, as will be described in more detail herein.
The third indicator lamp may be indicative of the lifting device 100 requiring service. As described further herein, the service interval may be based on time and/or usage of the lifting device and constant values may be pre-programmed in the control unit such that, when the lifting device exceeds the pre-programmed limit, the service indicator is activated.
The fourth indicator 203D may be indicative of the Expected Life Time (ELT) of the lifting device. For example, the lifting device 100 may have a predetermined life expectancy based on time and/or usage and, when this value is approached and/or exceeded, the control unit activates the indicator.
The control unit 202 may further comprise at least one port for sending and/or receiving signals from other devices in the lift control system 200. For example, in one embodiment, the control unit 202 comprises at least one transceiver, such as an infrared (IR) transceiver or a radio frequency (RF) transceiver, which may be utilized by the control unit 202 to send data signals to other components in the lift control system 200. In the embodiments shown and described herein, the control unit 202 of the lift control system 200 comprises an IR transceiver which is operable to send data signals to and receive data signals from the diagnostic monitor/control 208 and/or the wireless hand control 210.
As described herein, the control unit 202 may be coupled to a control device such as wired controller 212, wireless hand control 210, and/or diagnostic monitor/control 208. The wired controller 212 may be integral with the control unit 202 while, in other embodiments, the wired controller 212 may be coupled to the control unit 202 with a cable. In the embodiments shown and described herein, the wired controller 212 is integral with the control unit 202. The wireless hand control 210 and the diagnostic monitor/control 208 include IR or RF transceivers such that the wireless hand control 210 and/or the diagnostic monitor/control 208 are operable to send signals to, and receive signals from, the control unit 202.
Each of the wired controller 212, the wireless hand control 210 and the diagnostic monitor/control 208 comprise user input controls located on the control device which may be used to control the lifting device. For example, referring to the wireless hand control 210 depicted in
Still referring to
In the embodiments where the control unit comprises a battery 146, as depicted in
In the embodiments described herein, the control unit 202 also comprises circuitry and the memory of the control unit comprises corresponding computer readable and executable instructions for regulating and measuring the current supplied to the lift actuator 204 and the base actuator 206 by the lift control system 200. For example, the control unit 202 may contain circuitry which functions as an ammeter for monitoring the magnitude of the current supplied to either the lift actuator 204 or the base actuator 206. The control unit 202 may monitor the magnitude of the current and store the value of the supplied current in the memory of the control unit. In one embodiment, the memory of the control unit comprises computer readable and executable instructions for monitoring the power and/or current discharged by the battery and storing these values in memory. The control unit 202 may also be programmed to determine the average current consumption of the lifting device over a specified interval and store the value in memory.
The control unit 202 may also comprise computer readable and executable instructions for monitoring and/or preventing overload conditions during operation of the lift. For example, the control unit 202 may be programmed to monitor the current supplied to the lift actuator 204 when the lifting device is actuated with the control device as described above. The control unit 202 compares the current supplied to the lift actuator 204 to a predetermined current threshold value stored in the memory of the control unit. When the current supplied to the lift actuator 204 exceeds the current threshold value, the control unit 202 discontinues the current supplied to the lift actuator, thereby stopping the lifting device, and provides an indication, such as with indicator 203B, that the current supplied to the lift actuator has exceeded the current threshold value. The control unit may also be programmed to store the accumulated number of overload stops in the memory of the control unit.
The control unit 202 of the lift control system 200 may also comprise computer readable and executable instructions for timing various parameters relating to the operation of the lifting device and storing such parameters in the memory of the control unit 202. In one embodiment, the control unit 202 may comprise computer readable and executable instructions for storing the number of times the lifting device is started. For example, the control unit 202 logs a starting event each time the lifting device is started and continuously operated for a predetermined time period. The control unit 202 maintains a count of the accumulated number of starts in the memory of the control unit. Similarly, the control unit also maintains the accumulated operating time of the lifting device in the memory of the control unit. In one embodiment, the control unit maintains the total accumulated operating time of the lifting device as accrued over the entire lifetime of the lifting device and/or the periodically accumulated operating time of the lifting device as accrued between consecutive service events. The control unit 202 may also be programmed to monitor the elapsed calendar time between service events in addition to the total number of service events performed.
In another embodiment, the control unit 202 is programmed with computer readable and executable instructions for receiving and processing input signals from one or more sensors, such as the upper limit switch 214 and the lower limit switch 216. When the actuator arm 114 is fully extended (e.g., when the actuator arm has reached its maximum amount of travel), the upper limit switch 214 is triggered which, in turn, sends a signal to the control unit 202 indicating that the actuator arm 114 is fully extended and has reached an upper end position. The control unit 202 tracks each time the upper limit switch 214 is actuated (i.e., the number of upper end positions) and stores the accumulated number of upper end positions in memory. Similarly, when the actuator arm 114 is fully retracted, the lower limit switch 216 is triggered which, in turn, sends a signal to the control unit 202 indicating that the actuator arm 114 is fully retracted has reached a lower end positions. The control unit 202 tracks each time the lower limit switch 216 is actuated and stores the accumulated number of lower end positions in memory. Accordingly, based on the signals provided by the upper limit switch 214 and the lower limit switch 216, the control unit 202 determines when the actuator arm 114 has reached either extreme of its range of travel (e.g., fully extended or fully retracted).
Alternatively or additionally, the control unit 202 is programmed with computer readable and executable instructions for receiving and processing input signals from a load sensor (not shown) mechanically coupled to the lift arm of the lifting device. The load sensor may comprise a load cell, a linear varying displacement transducer (LVDT) or a similar sensor operable to detect a load applied to the lift arm of the lifting device and output an electrical signal indicative of that load to the control unit. The control unit 202 is programmed to determine the load applied to the lift arm based on the signal received from the load sensor and track the time that the load is applied to the lift arm.
The computer readable and executable instructions stored in the memory of the control unit 202 of the lift control system 200 may be executed by the processor to determine when a structural component of the lifting device or an electrical component of the lifting device is in need of service. More specifically, the lift control system 200 may be operable to determine when structural components and/or electrical components of the lifting device are in need of inspection and maintenance, when structural components and/or electrical components of the lifting device are in need of replacement, and/or when the lifting device has reached the end of its usable life. The operation of the lifting device 100 and the lift control system 200 of the lifting device for determining when the lifting device is in need of service will be described in more detail with respect to
Referring to
In an alternative embodiment, the at least one operating characteristic is the load applied to the lift arm 106 as measured by the load sensor mechanically coupled to the lift arm 106. In this embodiment, the load sensor outputs a signal indicative of the load applied to the control unit 202 which stores the value in memory.
After the at least one operating characteristic and the operating time have been determined and stored in the memory of the lifting device 100, the control unit 202 determines an accumulated operating time for the lifting device by adding the determined valued for the operating time to the previously accumulated operating time of the lifting device and storing the accumulated operating time of the lifting device in the memory of the control unit. The accumulated operating time may be the operating time accumulated since the last service event (i.e., a periodically accumulated operating time) and/or the operating time accumulated over the entire life of the lifting device (i.e., a total accumulated operating time).
An accumulated load-time parameter of the lifting device is also determined based on the at least one operating characteristic and the operating time of the lifting device. For example, the determined operating characteristic may be the load applied to the lift arm 106 and the load-time parameter is determined by multiplying the load by the time of operation of the lifting device and adding the product to a previously determined accumulated load-time parameter stored in the memory of the control unit. Alternatively, the operating characteristic may be the current supplied to the lift actuator 204 as the lift arm 106 is raised or lowered, the power discharged by the battery 146 as the lift arm 106 is raised or lowered, or the current discharged by the battery 146 as the lift arm is raised or lowered. In this embodiment, the accumulated load-time parameter is determined by multiplying the current or power by the operating time of the lifting device and adding the product to a previously determined accumulated load-time parameter stored in the memory of the control unit. The newly determined accumulated load-time parameter is then stored in the memory of the control unit. The accumulated load-time parameter may be a periodically accumulated load-time parameter (i.e., the load-time parameter accrued since the last service event) and/or the accumulated load-time parameter (i.e., the load-time parameter accrued over the entire life of the lifting device).
In one embodiment, after the accumulated operating parameter is determined, the lift control system compares the accumulated operating parameter to a predetermined service constant stored in the memory of the lifting device to determine if a structural component of the lifting device is in need of service. In one embodiment, the comparison between the accumulated operating parameter and the service constant is utilized to determine if a structural component of the lifting device requires inspection or maintenance. In this embodiment, the accumulated operating parameter is a periodically accumulated operating parameter and the service constant is a service load-time interval. For example, the service load-time interval may be a predetermined load-time value which is indicative of when structural components of the lifting device need service. If the service load-time interval is greater than the periodically accumulated operating parameter, no inspection or maintenance is needed. However, if the service-load time interval is less than or equal to the periodically accumulated operating parameter, inspection and maintenance of at least one structural component of the lifting device is required and the control unit 202 activates the third indicator lamp 203C (i.e., the maintenance indicator) thereby indicating to a user that the lift is in need of inspection and/or maintenance.
The comparison between the accumulated operating parameter and the service constant may also be utilized to determine if a structural component of the lifting device needs to be replaced. In this embodiment, the accumulated operating parameter is a total accumulated load-time interval and the service constant is indicative of a replacement load-time interval of at least one structural component of the lifting device. For example, each structural component of the lifting device may have an associated replacement load-time interval which generally corresponds to a predetermined percentage of the useable service life of the structural component. If the replacement load-time interval is greater than the total accumulated operating parameter, none of the structural components of the lifting device need to be replaced. However, if the replacement load-time interval is less than or equal to the total accumulated operating parameter of the lifting device at least one structural component of the lifting device requires replacement and the control unit 202 activates the third indicator 203C (i.e., the maintenance indicator) thereby indicating to a user that at least one structural component of the lifting device is in need of inspection and/or maintenance. To differentiate from the embodiment described above wherein illumination of the maintenance indicator lamp indicates the need for inspection and maintenance of a structural component of the lifting device, the control unit may activate the indicator differently for each set of circumstances. For instance, where the indicator is an LED, the indicator may be activated to flash when a structural component of the lifting device is in need of service or maintenance and the indicator may be constantly illuminated when one or more structural components of the lifting device are in need of service.
The comparison between the accumulated operating parameter and the service constant may also be utilized to determine if the lifting device has reached the end of its usable service life. In this embodiment, the accumulated operating parameter is a total accumulated load-time interval and the service constant is indicative of a usable service life of the lifting device. For example, the lifting device 100 may have a predetermined service life and the usable service life may be indicative of a predetermined percentage of the service life. If the usable service life is greater than the total accumulated operating parameter, the lifting device 100 may remain in operation. However, when the total accumulated operating parameter reaches a predetermined percentage of the usable service life, the lift control system 200 of the lifting device may activate the fourth indicator 203D. For example, when the fourth indicator is an LED, the lift control system 200 may cause the fourth indicator to flash indicating that the total accumulated operating parameter has reached a predetermined percentage of the usable service life of the lifting device 100. When the total accumulated operating parameter is greater than or equal to the usable service life, the lift control system 200 of the lifting device activates the fourth indicator 203D. For example, when the fourth indicator is an LED, the lift control system 200 causes the fourth indicator 403 to remain illuminated indicating that the total accumulated operating parameter has reached and/or exceeded the usable service life of the lifting device 100 and that use of the lifting device should be discontinued. Additionally, when the total accumulated operating parameter is greater than or equal to the usable service life, the lift control system 200 of the lifting device may prevent further operation of the control device.
While specific embodiments described herein relate to the inspection, maintenance and/or replacement of lift structural components, it should be understood that similar procedures may be used in conjunction with service constants related to the use of electrical components of the lift to determine when the electrical components of the lift require inspection, maintenance and/or replacement.
In addition to comparing the accumulated operating parameter to the service constant to determine when the lifting device is in need of service, the lift control system also compares the periodically accumulated operating time of the lifting device to an operating time service constant. The operating time service constant is indicative of a maximum time period between service intervals. If the periodically accumulated operating time of the lifting device is greater than or equal to the operating time service constant, the lifting device is in need of service and the lift control system 200 illuminates the third indicator 203C. Where the third indicator 203C is an LED, as described above, the third indicator 203C may be made to flash in a particular pattern to indicate that the periodically accumulated operating time has exceeded the operating time service constant.
When the third indicator 203C is activated, the lifting device 100 may be serviced by a technician who performs the required inspection, maintenance and/or replacement of structural components as needed. Where the fourth indicator 203D is activated, the lifting device 100 may also be serviced. However, when the fourth indicator 203D is activated, the service may be more extensive and may include a complete overhaul or refurbishment of the lifting device. Regardless of the type of service performed, the date of the service event may be entered into the memory of the control unit and the control unit may update the total accumulated number of service events that have been performed on the lifting device. Additionally, the type of service performed as well as an indication of any structural components that have been repaired and/or replaced may also be saved in the memory of the control unit. Accordingly, it should be understood that a service record may be saved in the memory of the lift control system of the lifting device and that service record accompanies the lifting device throughout its lifetime.
As described hereinabove, the lift control system 200 of the lifting device 100 may comprise a wireless diagnostic monitor/control 208. In addition to providing user inputs to control the functionality of the lifting device, the diagnostic monitor/control 208 may comprise a processor and a memory having computer readable and executable instructions which enable the diagnostic monitor/control to be utilized as a diagnostic tool for servicing and maintaining the lifting device 100. In one embodiment the diagnostic monitor/control 208 is programmed to send data to and receive data from the control unit 202. For example, the data sent to the control unit comprises at least one operational parameter (i.e., the current threshold limit or a similar parameter) and/or at least one service constant such as, for example, the service time interval, the replacement interval of at least one structural component and/or the usable service life of the lifting device. The operational parameters and/or service constant may be stored in a memory operatively associated with the control unit 202. The data received by the diagnostic monitor/controller from the control unit 202 comprises at least one operating characteristic and/or an accumulated operating parameter of the lifting device. The operating characteristic and/or accumulated operating parameter is stored in a memory operatively associated with the diagnostic monitor/control 208. An operator or service technician may retrieve the at least one operating characteristic and/or accumulated operating parameter from the diagnostic monitor/control 208 and/or otherwise review the at least one operating parameter and/or accumulated operating parameter on the display 234 of the diagnostic monitor/control 208.
Further, the computer readable and executable instruction set stored in the diagnostic monitor/control 208 may be executed by the processor of the diagnostic monitor/control 208 to reset various service and/or life parameters stored in the controller. For example, when the service indicator (i.e., the third indicator described above) is illuminated, thereby indicating that the lifting device 100 requires service, the diagnostic monitor/control 208 may be used to reset the service lamp and restart the service interval. Further, when the ELT indicator (i.e., the fourth indicator described above) is illuminated, thereby indicating that the lifting device 100 has reached or is approaching the predetermined service life expectancy, the diagnostic monitor/control 208 may be operable to reset the service ELT indicator and restart the ELT counter following refurbishment of the lifting device. Accordingly, it will be understood that the diagnostic monitor/control 208 may be used reset various parameters associated with the operation and maintenance of the lifting device.
In another embodiment, the computer readable and executable instruction set stored in the memory of the control unit 202 and/or in the diagnostic monitor/control 208 may be executed to upload at least one accumulated operating parameter and/or the operating characteristic to a computer 300, network, or other, similar data storage device, where the at least one accumulated operating parameter and/or the operational characteristic are stored in a history file unique to the specific lifting device 100. For example, in one embodiment, the history file is correlated to the serial number of the lifting device and/or the identification number of the controller which is stored in the memory of the control unit 202. In one embodiment, the history file may be accessed remotely, such as over an internet or similar network connection, and an operator or technician may utilize the data stored in the history file to perform diagnostics on the particular lifting device 100. For example, the at least one accumulated operating parameter and/or the operational characteristic may be analyzed to determined if the lifting equipment is suitable for the conditions of use (e.g., loads, height of lifts, total power consumption, etc.) under which the lift is being used. For example, if the history file of the lifting device indicates that the number of upper end positions is abnormally high, the lifting device may not have the desired vertical range of motion. Accordingly, the lift mast 104 of the lifting device 100 may need to be raised. Similarly, if the number of overload stops is high, the lifting device 100 may not be suitable for the loads being applied to the lifting device 100 and an alternative lifting device and/or actuator may be recommended. Further, the history file may be utilized to determine if the lifting device 100 is being properly used by reviewing the number of overloads, the charging history, the number of batteries used, the total number of starts and actuator drive time as well as the total actuator drive time and calendar time since the last reset. The history file may also be utilized to track the lift through service records which may be associated with the serial number of the lifting device 100. In addition, the history file may also be used to determine if either the structural components or the electrical components are in need of service and/or replacement.
In addition to functioning as a controller for the lifting device 100 and/or a diagnostic tool for maintaining the lifting device 100, the diagnostic monitor/control may also be used to instantaneously access operating data stored in the control unit 202 of the lifting device. For example, the diagnostic monitor/control 208 may also be operable to accumulated operating parameters stored in the memory of the control unit. Such information may be instantaneously available to a technician or salesperson to determine if the lifting device is in need of service, requires spare or replacement parts, or if a different model of lifting device may be more suitable for the operator's needs.
It should now be understood that the lift control system shown and described herein may be used in conjunction with a lifting device to assess the suitability of the equipment for use in conjunction with the specific operational conditions as well as to determine the proper maintenance and repair intervals for the lifting device. Further, the lift control system shown and described herein provides a system by which operating and service parameters may be easily and readily accessed and tracked throughout the life of the lifting device.
It should also be understood that the use of a periodically accumulated load-time parameter facilitates servicing the lifting device according to usage rather than servicing the lifting device according to time. For example, lifting devices which are used more frequently will be serviced more often than lifting devices that are used less frequently. Accordingly, use of the periodically accumulated load-time parameter to determine when the lifting device needs to be serviced permits flexibility in servicing the lifting device and allows the lifting device to be serviced as needed rather than according to a rigid maintenance schedule. This may result in reduced device down time due to preventative maintenance in cases where the lifting device is frequently used and reduced maintenance costs where devices are used less frequently.
While the specific embodiments described herein relate to a mobile lifting device comprising an actuator and a lift arm, it should be understood that the basic principle of operation of the lift control system may be applied to lifting devices having various other configurations.
While particular embodiments and aspects of the present invention have been illustrated and described herein, various other changes and modifications can be made without departing from the spirit and scope of the invention. Moreover, although various inventive aspects have been described herein, such aspects need not be utilized in combination. It is therefore intended that the appended claims cover all such changes and modifications that are within the scope of this invention.
The present specification is a continuation of U.S. patent application Ser. No. 16/995,060 entitled “LIFT CONTROL SYSTEMS FOR LIFTING DEVICES AND LIFTING DEVICES COMPRISING THE SAME” filed Aug. 17, 2020 which is a continuation of U.S. patent application Ser. No. 16/395,918 entitled “LIFT CONTROL SYSTEMS FOR LIFTING DEVICES AND LIFTING DEVICES COMPRISING THE SAME” filed Apr. 26, 2019 (now U.S. Pat. No. 10,780,004) which is a continuation of U.S. patent application Ser. No. 15/360,373 entitled “LIFT CONTROL SYSTEMS FOR LIFTING DEVICES AND LIFTING DEVICES COMPRISING THE SAME” filed Nov. 23, 2016 (now U.S. Pat. No. 10,322,046) which is a continuation of U.S. patent application Ser. No. 13/796,100 entitled “LIFT CONTROL SYSTEMS FOR LIFTING DEVICES AND LIFTING DEVICES COMPRISING THE SAME” filed Mar. 12, 2013 (now U.S. Pat. No. 9,527,699) which is a continuation of U.S. patent application Ser. No. 12/717,532 entitled “LIFT CONTROL SYSTEMS FOR LIFTING DEVICES AND LIFTING DEVICES COMPRISING THE SAME” filed Mar. 4, 2010 (now U.S. Pat. No. 8,474,794) which claims priority to U.S. provisional application Ser. No. 61/158,050 filed Mar. 6, 2009 and entitled “CONTROL AND DIAGNOSTIC SYSTEMS FOR LIFTING DEVICES,” each of which is herein incorporated by reference in their entireties.
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