Patent Grant
8736459
This application claims priority to foreign Patent Application CA 2696927, filed on Mar. 19, 2010, the disclosure of which is incorporated herein by reference in its entirety.
The present invention relates to the field of back-and-forth cable system. More particularly, it concerns a control system and a method of operating a back-and-forth cable system.
Back-and-forth cable systems are typically used for the practice of wakeboarding. They generally include two towers, a motor, a running cable extending between the towers and a carrier connected to the cable, for towing or pulling a boarder over a water area. In opposition to cableway systems, which enable several boarders to ride at the same time, and where the cable forms a loop running in a single direction, back-and-forth cable system are generally used for pulling one boarder at a time, the cable changing direction at the end of each course, in order for the carrier to move back-and-forth between the two towers.
A problem with existing systems is the difficulty to manage problems related to the cable, such as slippage of the cable over the pulleys, stretching of the cable, and especially lateral stretching, inadequate tensioning, etc. These problems make it difficult to precisely locate the carrier over a given course between the towers. Being able to locate the carrier precisely over the course is required for establishing the turning points, that is, the limit positions at which the carrier will change direction.
Slippage and lateral stretching of the cable is not an issue in cableway systems since such systems do not need determine precisely the position of the carrier: the carrier is moved continuously in the same direction and the rotation of the shaft of the motor is not stopped and inverted when in operation, such as required with back-and-forth system.
Some of the existing back-and-forth systems use motor encoders in order to determine the location of the carrier between the towers; however, an encoder cannot take account of slippage or stretching of the cable. The cable of a back-and-forth system can be suddenly tensioned and pulled away from their linear path since wakeboarders usually slalom and zigzag over the water surface, or jump over platforms and obstacles placed along the course, thereby stretching the cable laterally.
Another drawback of existing back-and-forth cable systems is the difficulty to easily and securely control their operation. The motor is generally controlled by means of a potentiometer which must be turned manually in order to vary the speed of the motor. Since the control is done manually, the acceleration of the carrier, the cruising speed and the position of the turning points are not steady or repeatable throughout a wakeboarding session, which is not ideal.
Another drawback of most existing back-and-forth cable system is the necessity to have access to an industrial 460V power line in order to power the system. The few existing systems which can be used with a 220V power line require cumbersome transformer or transducer for converting the single phase 220V line to a three-phase line.
In light of the above, there is a need for a control system and for a method of operating a back-and-forth cable system which are secure for both the rider and the operator. There is also a need for an automated back and forth cable system which provides a smooth, secure and predictable ride for the boarders.
The present invention advantageously provides a control system and a method of operating a back-and-forth cable system that satisfies at least one of the above-mentioned needs.
In one embodiment of the present invention, a control system for a back-and-forth cable system includes a running cable, a first pulley and a second pulley, said pulleys being located at both ends of a course for guiding the running cable, a controllable motor assembly for driving one of the pulleys and a carrier connected to the running cable.
This control system comprises:
Preferably, the controller further comprises two position counters, each of said position counters being associated with a corresponding one of the positions of the carrier, the controller resetting the position counters when said two positions of the carrier go beyond either one of the first and second limit positions
There is also provided a back-and-forth cable system comprising the control system described above, first and second towers, the running cable, the first pulley which is mounted on the first tower, the second pulley which is mounted on the second tower; and the controllable motor assembly. Preferably, the controllable motor assembly includes a 220V motor drive.
In accordance with another aspect of the present invention, a method for operating a back-and-forth cable system including a running cable and pulleys located at both ends of a course for guiding the running cable, a controllable motor assembly for driving one of the pulleys and a carrier connected to the running cable is provided.
This method comprises the steps of:
Preferably, the method further comprises the steps of resetting the first and the second positions when said two positions of the carrier go beyond either one of the first and second limit positions.
Advantageously, the control system facilitates and renders more secure the operation of the back and forth system. It allows for a better control of the turning points by taking into account slippage and lateral stretching that might occur.
By rotation of the pulley, it is meant the angular displacement of the pulley, in a clockwise or counter-clockwise direction.
By rotation of the motor, it is meant the rotation of a shaft of the motor driving one of the pulleys.
By limit positions, it is meant the positions at which the carrier is set to change direction. The limit positions determine the path along which the carrier is to move such as when pulling or towing a rider.
These and other objects and advantages of the invention will become apparent upon reading the detailed description and upon referring to the drawings in which:
In the following description, similar features in the drawings have been given similar reference numerals and in order to way down the figures, some elements are not referred to in some figures if they were already identified in a preceding figure.
Lately, there has been a need for the practice of aquatic sports and activities with greater environmental respect, where pollution of water, air and water shores can be reduced or eliminated. The control system of the invention aims at pulling or towing wakeboarders and water-skiers, with small electricity consumption and with limited water or air pollution. In addition, in regions where weather conditions allow it, this system aims at allowing the practice of snowboarding or snow-skiing on flat surfaces covered with snow, such as on iced lakes.
With reference to
The control system 10 includes a first tracking device 25 associated with the first pulley 16, in order to generate a first tracking signal indicative of the rotation of the first pulley 16. The control system 10 also includes a second tracking device 28 associated with the second pulley 18, in order to generate a second tracking signal indicative of the rotation of the second pulley 18. The rotation of each pulley provides information on the direction in which the carrier is being moved, and also on the speed and acceleration of the carrier. Using this information it is possible to determine or estimate a position of the carrier based on the rotation of each one of the pulleys.
The control system 10 also includes storing means 32 for storing a first limit position 34 and a second limit position 36 along the course. These limit positions 34, 36 correspond to the actual locations where the carrier is to change direction. They are can also be referred to as “turning points” since they correspond to the locations where the rider or boarder needs to turn in order to continue its ride in the other direction.
The control system 10 also includes a controller 38. The controller 38 is preferably a programmable logic controller (PLC), but other types of controller can also be considered, such as a PC, or a PLC module integrated in the drive 23 of the controllable motor assembly 20. In this preferred embodiment, the storing means 32, such as a compact flash memory for example, are part of the controlling, but other arrangements are possible. The controller can of course access and modify the values stored in the storing means.
The controller 38 has inputs in order to receive the first and the second tracking signals from the respective tracking devices, the signals being representative of positions of the carrier. In other words, each tracking device 25, 28 tracks a position for the carrier. Since the cable can slip at the driven pulley 16, or can be stretched laterally, as shown in
The controller generates a control signal to invert the rotation of the controllable motor assembly 20 when both positions of the carrier 24, detected respectively by the first and second tracking devices 25, 28, go beyond either one of the two limit positions 34, 36. For example, if the carrier is approaching tower A, the controller will wait until both signals received from the tracking devices indicate that the positions of the carrier have passed the first limit position 34 before inverting the rotation of the shaft of the motor 21, so that the carrier can be directed towards tower B. Of course, in addition to inverting the rotation of the shaft of the motor, the controller can also decelerate the rotation prior the inversion so that the change of direction is done smoothly.
In order to do so, the control system 10 includes two position counters 40, 41, each of said position counters 40, 41 being associated with a corresponding position of the carrier. In other words, the position counter 40 keeps count of the displacement or position of the carrier based on the tracking signal emitted from the tracking device 25 located at tower A, and the position counter 41 keeps count of the position of the carrier based on the tracking signal emitted from the tracking device 28 located at tower B. The controller resets the position counters 40, 41 when the two positions of the carrier go beyond either one of the limit positions 34, 36. This is done in order to prevent the difference between the positions of the carrier 24 from continuously incrementing during the course of a wakeboarding session. Putting both counters 40, 41 to zero once positions of the carrier 24 have passed a limit position 40 or 41 ensures that the positions of the carrier 24 as viewed by each of the tracking device 25, 28 are the same at the beginning of each run between the two towers.
Still referring to
The control system 10 further includes a controllable tensioner 46 for tensing the tension cable of the back-and-forth system when required. By tensioner 46, it is meant any means to adjust the tension within the tension cable. Within the storing means 32, a second predetermined tension threshold Tmin2 is saved. The controller 38 is provided with an output to send a tension control signal, and the tensioner 46 is provided with an input to receive such tension control signal. The controller 38 sends a tensing control signal to the tensioner 46 when the tension of tension cable 44 is below Tmin2, in order to increase the tension of cable 44. Of course, the tension of the cable 44 is indicative of the tension in the running cable. When the tension of cable 44 is increased, the tension is the running cable 14 is also increased. In addition, it is also possible to have the tension sensor 42 incorporated in the tensioner 46. In
Of course, another threshold Tmax2 can be saved in the storing means 32. When the tension detected by the tension sensor exceeds Tmax2, the controller sends a signal to the tensioner 46 to decrease the tension of the tension cable 44, thus reducing the tension in the running cable. Variation of tension in the running cable can occur for various reasons, the most common being due to temperature changes.
In order to facilitate the management of the cable system, and for allowing the operator to focus his attention on the rider, a duration limit is stored within the storing means 32. The controller is provided with a duration counter 48 in order to keep track of the time elapsed since the controllable motor assembly 20 is in operation. The controller generates a control signal to stop the rotation of the motor when the time elapsed since the beginning of a session is equal to the duration limit.
To facilitate the management of the cable system, predetermined values or parameter related to the different sequences of a training session can be used. An acceleration A, a speed S and a deceleration D, along with three time periods ta, ts and td, respectively associated with acceleration A, speed S and deceleration D are saved within the storing means 32. The controller 38 generates a control signal to vary the rotation of the controllable motor assembly 20 so that the controllable motor assembly accelerates at a rate A during the time period ta, turns with said speed S during the time period ts and decelerates at a rate D during a time period td. In other words, a wakeboarding session can be completely automated, the controller 38 adjusting the rotation of the motor, and consequently the displacement of the carrier 24, according to predetermined parameters. The ride, from the beginning to the end, can be controlled automatically, within requiring any intervention from an operator.
Referring now to
Now referring to
In operation, at tower A, the first tracking signal of tracking device 25 forms a pulse P1 when the first detector 54 of tower A detects the corresponding metal strip 58, and a pulse P2 when the second detector 56 detects the metal strip 58. Similarly, at tower B, the second tracking signal forms a pulse P3 when the first detector of the second tracking device 28 detects the metal strip 58 and a pulse P4 when the second detector 56 detects the metal strip 58. This construction of the tracking device is particularly advantageous since it allows the detection of “false pulses”. Using two sensors allows the controller to wait for a predetermined sequence, for example P1-P2-P1, prior to determining that the pulley completed a rotation. When only one sensor is used, and the metal strip stop near the detection limit of the sensor, the sensor could generate several pulses while in reality, the pulley is idle. The use of two sensors 54, 56 allows overcoming such problem. Of course, other means could be considered, such as quadrature encoders for example.
The controller 38 includes a monitoring module 60 in order to monitor the first and second tracking signals, and means 62 to detect an anomaly on the first and second tracking signals. The controller 38 generates a control signal to the controllable motor assembly 20 to stop the motor 21 when such an anomaly is detected on either one of the tracking signals. This characteristic of the controller provides a safer operation of the cable system, since the displacement of the carrier, and thus the rider, is based on the detecting signals.
Now referring to
With reference to
Still referring to
With reference to
Referring now to
In this preferred embodiment of the invention, the electric panel 39 is installed at about a hundred feet from the departure tower A. This electric panel 39 is powered by a 220V entry with a circuit breaker of 40 A and a ground. The control console 64 is connected to the electric panel 39, and is preferably located no more than a hundred feet away from the electric panel 39, using the security or proximity cable 72. Four sensors are divided in two groups, corresponding to each tower: sensors 54 and 56 located on tower A and sensors 54 and 56 located on tower B. These sensors are affixed on the frame supporting the pulleys 16, 18. The metal strips 58 are each affixed on a corresponding pulley. The motor drive 23 is installed near the top of tower A (which is the “driving” tower). Specific ratio and HP for the motor assembly 20 can be determined according to the particularities of each site and according to the type of application. Preferably, a motor brake 22 is integrated to the motor 21 and powered by a 220 voltage. The detectors 50, 52 are located at both ends of the course for security purposes. They are respectively located on tower A and B, and preferably at an approximate distance of 12 feet (3.7 meters) from the pulleys. A tension sensors 42 is installed near the top of the towers, between tension cable 44 and the connecting point of this cable.
With reference to
With reference to
The following list of numeral references is provided for
The invention also concerns a method of operating the back-and-forth cable system 12, which includes the running cable 14, the pulleys 16, 18 located at both ends of the course for guiding the running cable 14, the controllable motor assembly 20 for driving one of the pulleys 14, 16 and the carrier 24 connected to the running cable 14. This method includes the steps of:
The method can further includes the steps of resetting the first and the second positions 34, 36 when said two positions 34, 36 of the carrier 24 go beyond either one of the first and second limit positions 34, 36.
According to this method, in step a), the first position of the carrier is updated only when a first predetermined sequence of pulses is detected on the received first tracking signal, and wherein in step b), the second position of the carrier is updated only when a second predetermined sequences of pulses, which can be the same or different than the first sequence, is detected on the received second tracking signal.
It is preferably that in step a), the first position of the carrier is updated only when a first predetermined sequence of pulses is detected on the received first tracking signal, and wherein in step b), the second position of the carrier is updated only when a second predetermined sequences of pulses is detected on the received second tracking signal. This predetermined sequence can be for example P1-P2-P1 for the first tracking device 25 and P3-P4-P3 for the second tracking device 28.
With reference to
This method preferably includes the steps of monitoring the first and second tracking signals, and to stop the controllable motor assembly 20 when an anomaly is detected on either one of the tracking signals.
According to this method, it is possible to store the first predetermined tension threshold Tmin1 in the storing means 32, to provide a tension signal indicative of a tension of a tension cable 44 of the back-and-forth system 12. An alarm signal is generated when the tension signal is below the first predetermined tension threshold Tmin1. Of course, similar steps can be performed in order to detect an over-tension of the cable 44.
The method also allows for storing a second predetermined tension threshold Tmin2, and to increase the tension in the tension cable 44 when the tension signal detected by the tension sensor 42 is below the second predetermined tension threshold Tmin2. Similarly, it is possible to decrease the tension of the tension cable when the cable is over-tensed.
Advantageously, the method can also include the steps of storing a duration limit, to keep track of a time elapsed since the controllable motor assembly 20 is in operation; and to stop the rotation of the controllable motor assembly 20 when the time elapsed as reached the duration limit. At any time, it is also possible for the operator of the console to reset the duration limit.
The method can also include the steps of storing or saving an acceleration A, a speed S and a deceleration D and three time periods ta, ts and td, associated respectively with said acceleration A, speed S and deceleration D. The rotation of the motor is varied so that the controllable motor assembly accelerates at a rate A during the time period ta, turns with said speed S during the time period ts and decelerates at a rate D during the time period td, thereby allowing automated riding session.
In order to increase the security of the rider when the system is in operation, the method further includes the steps of detecting the carrier when said carrier is located between the first pulley 16 and the first limit position 34 or between the second pulley 18 and the second limit position 36, and the step of stopping the rotation of the motor 21 when said the carrier is detected.
According to a preferred embodiment of this method, when the system 10 is put in operation, it is recommended to proceed with a validation of the control buttons in manual positions, and to ensure that no alarms or faults are detected. The first operational commands are followed in order to automatically synchronize the departure position. This synchronizing function will establish a mechanical point of synchronization, or mechanical “zero” position 51, corresponding to the location of detector 50. The synchronization is done using the sensors 54, 56 and metal strip 58 of tower A, along with sensor 50 on the departure tower A. The detector 50 is activated by the contact of the carrier 24 in displacement. Once the carrier 24 has contacted the detector 50, the control system 10 will send a control signal to the motor 21 for inverting its direction and will control the position of the carrier 24 automatically by counting the pulses from the departure position 53, which can be at a predetermined location between the sensor 50 and the first limit position 34. The departure position 53 and limit position (or turning points) 34, 36 are pre-determined or pre-established and can be modified according to installation sites.
Operation of the System
The following paragraphs provide information on how the system can be operated, with reference to table 1—Operational commands and table 2—Operational Control Signals, and also to
Using the operational commands No. 2, a sound signal is generated and the departure is controlled automatically. The release of the directional acceleration lever 88 establishes the speed of the carrier displacement. The data related to the manual acceleration set by the lever can be memorized for feature segments.
During the carrier 24 displacements, the control system 10 is able to detect, monitor and analyze the pulses generated by the sensors 54, 56 on each tower, in order to establish the position of the carrier 24. The control system allows an automatic setting of the limit positions 34, 36 (or turning points), which are preferably located towards each end of the course. These turning points 34, 36 are established and pre-programmed according to the specific characteristics of the site.
When a wakeboarder or skier falls during a training session, the operator, controlling the control console 64, using operational commands No. 3, must immediately stop the system 12 at a given position, performing a “positioned stop”. When the carrier 24 is stopped, the operator must, using operational commands No. 4, move the carrier 24 in the manual mode in order to bring it closer to the fallen rider. During this operation, the control system 10 will determined the location of the carrier (which was stopped using the “positioned stop” 92 button) in order to determine the direction of the take-off. A light signal (or “on” signal) will automatically be sent to either one of the signalling lights 66, 68, according to the direction in which the carrier will be moved. When the towing cable connected to the carrier is well-tensioned, the boarder advises the operator, using a hand sign, that he is ready to continue the session, and the operator proceed with operational commands No. 5 to set the control system in the automatic mode. A sound signal coming from the control console 64 will be generated prior to each automatic departure, and advising the operator of the imminent departure.
During a back-and-forth cable system session, the speed of the controllable motor assembly 20 is recorded and saved during the first segment of the path. However, at any time, it is possible, using operational commands No. 6, to modify the cruising speed S. Advantageously, the acceleration A and speed S of the carrier can be adjusted according to the experience and age of the boarders.
The time allocated to a back-and-forth cable system session is pre-determined (approximately 8 minutes) and is monitored automatically at the boarder's departure. When the system 10 must be stopped during a session, operational commands No. 7 will allow the operator to reset the counter 48 which counts the time elapsed since the beginning of the session. The control system 10 will send a blinking light signal to the signalling lights 66, 68 in order to advise the boarder of the end of the session. Preferably, the signalling lights 66, 68 will blink during the last segments of the session and the system will bring back the carrier automatically at the departure position 53.
In order to increase the security of the back-and-forth cable system, the operator can, according to circumstances, activate an emergency stop button 93, at any time, using operational command No. 8. When this emergency stop 93 button is activated, the system will immediately cease its operation, and contactors C2 and C3 (on
With reference to
Resetting the system 10 is made directly on the electric panel 39. This ensures that there is no remaining residual current.
Preferably, the control system 10 includes a proximity cable 72 connected or linked to the operator. In other words, an operator needs to be connected to its control console 64 in order to operate the system 10. This security procedure ensures that the operator will not wander away from the control console 64 and will be ready to intervene at any time during a training session. If the security cable 72 is disconnected, the system 10 will be stopped automatically (operational command No. 11).
The control console 64 transmits to the operator, through the lighted buttons of the console: Proximity Stop 82; Rearm 90; Positioned Stop 92 and Emergency Stop 93, control signals and faults. Table 2 provides more information on the functioning of console buttons. Preferably, green lighted buttons confirm the different functional operation of the system and green and red lighted buttons allow the operator to diagnose rapidly anomalies of the system during its functioning.
With reference to
Having a control system 10 working on a two phase-220V requires a proper balancing of the phases, proper protection filters to prevent and peaks of voltage on the phases, and an oversized drive for controlling the motor, in order to be able to manage the power needs of the system.
The control system 10 includes a programmable controller 38, for allowing an automated or manual control of the system, based on the selection made on a remote control console 64 using the MODE button 84, a feature not available on existing back-and-forth cable systems.
The programmable controller 38 allows controlling the departure of a boarder with a given acceleration A in order to reach a predetermined speed S. This predetermined speed S can be varied according to the experience of the boarder. The speed is saved automatically for future back-and-forth sequence. This predetermined speed S can be erased and modified at any time during a session using the operational function No. 6.
Using the controller 38, it is also possible to control the limit positions at two extremities of the course along which the boarder can be pulled. In other words, the controller 38 allows the modification of the positions of the turning points. An analysis of the pulses allows to obtain a sequential logic and precise turning points using this automated turning function.
The controller 38 is able to monitor the pulses detected, and analyze the difference between these pulses, such that it can proceed with a correction in order to re-establish the turning points, using an automated correction function.
The turning points 34, 36 can be memorized in the controller 38. It is also possible to move them using an operational function in order to increase the length along which the boarder is pulled. The turning points can be moved using a manual correction function such that they can be adjusted according to different installation sites.
The controller 38 can monitor the pulses received such that a defect on the pulse signal can be detected at the control console. When a defect or anomaly on the pulse signal is detected, the system will be stopped automatically and will move the carrier 24 using manual operational functions at low speed to finish the segment. This pulse signal analysis ensures a better security and control over the position of the carrier on the back-and-forth systems.
Still using the controller 38, it is possible to control and modify the time allocated for a back-and-forth session. Such function allows the operator to focus on secure back-and-forth sequences of the boarder without worrying about the time elapsed since the beginning of the session. This control of the time elapsed for a session is realized using an integrated timer or counter.
By accessing this timer through the controller 38, an operator can reset the time elapsed for a session to “zero” using an operational function called “time rearm”.
The controller and the timer allow having the signalling lights automatically blink on the towers in order to advise the operator and boarder that the end of the session is approaching. Preferably, red lights are installed at mid-height of the towers in order to give the boarder an indication of the end of the session. Following this blinking signal, the carrier will be brought back automatically to the departure position, realized using the “automated stop function”.
The controller and the signalling lights on the towers allow for a better control of the system when a boarder falls in the water. The controller allows the operator to stop the segment using the control console and a function called “positioned stop”. The system will establish automatically the direction of the carrier either in a “frontward” or “backward” direction. The light on the tower towards which the carrier will be directed will be lighted. This prevents any confusion of the boarder since you will note, by looking at the signalling lights, in which direction the carrier will move. This function renders the operation of the system more secure.
In addition, the system 10 includes carrier detectors, such as proximity switches, at both ends of the course. A proximity detector is installed near each one of the towers in order to indicate that the carrier has gone beyond the pre-established limits in between which the carrier is to be moved. When such situation arises, the detector will send a signal to the controller 38, which will stop automatically the system 12 and transmit an alarm to the control console 64. These detector 50, 52 and this function prevent the carrier 24 from crashing in either one of the towers, would a defect on the system occur. When the detector is activated, operational functions will move the cable in manual mode at low speed in order to re-establish synchronization with the detectors 50 and 52.
The controller can, using the pulse sensors 54, 56 and the carrier detector 50 of tower A, establish a synchronization position 51 with the carrier 24. A mechanical “zero” point 51 can thus be established for synchronizing the automated system 10 and the mechanical displacement of the carrier 24.
Preferably, the control console 64 is provided with a security cable 72 and proximity switch which ensures that, in the event that the operator moves away from the control console 64, the system will be stopped. By using such proximity switch, the operator of the system must stay connected to its control console at any time.
Both the electric panel 38 and the control console 64 are provided with an emergency stop. When the emergency stop is activated, contactors C2 and C3, which control the power supply of the system, will cut the power before and after the drive. Once the emergency stop has been activated, the operator cannot start back the system 10 without first rearming the system on the electric panel 38. These operational functions for putting back the cable system in operation are controlled using the security relay MSR. This setup ensures a high level of security.
Preferably, the control console 64 is provided with a display 65 for displaying the speed of the drive 23. The display allows visualizing the speed of the carrier 24 and thus allows to control it using the speed drive function on the control console 64. This characteristic of the system 10 increases the control an operator can have on the automated system remotely.
The control console 64 is provided with a speaker in order to be able to emit a sound signal when the system is put in operation automatically. Once the system has checked that all conditions are met in order to proceed with an automated take-off, the sound signal will be emitted prior to the take-off in order to advise the operator of an imminent departure.
Preferably, the electric panel 38 is provided with a temperature controller 126 and heating system 146 in order to maintain an appropriate temperature for the correct functioning of the system 10. A pre-alarm will advise the operator through the control console 64 if a temperature increase arises, and an alarm will prevent the system from operating when such temperature detected is too high. These features prevent overheating of the system 10 during the summer and increase the liability of electrical components of the system.
Preferably, the electric panel 38 is provided with a heating system 146 required for example in regions having winters.
Also preferably, the panel 38 is designed such that even when the power supply is cut, the temperature control of the system will be maintained. The heating system 146 will allow to keep the electrical and electronic components of the electric panel 38 at their operating temperature in order to ensure a correct functioning of the system.
Still preferably, the system 10 is also provided with electronic tension sensors 42 installed on the tension cables 44 of the towers. These sensors 42 continuously transmit tensing signals indicating the tension of the tension cables 44 when the system is in operation. A pre-alarm advises the operator when the tension of the tension cable 44 is below a predetermined threshold. The cable will need to be tensed in order to deactivate this pre-alarm. The system will stop working if an alarm indicates that the tension of the tension cable is below another predetermined tension threshold. The tension sensors allow prevention the stretching of the cables 44. They also ensure that a constant tension is applied on the back-and-forth cable system 12.
Preferably, the motor 21 used for the back-and-forth cable system is a 7.5 HP motor gear. This motor gear preferably includes a 220 volts brake 22. The breakage control is done using a high-efficiency contactor C3 located in the electric panel 38. When the brake 22 is powered, it can be disengaged or not in order to free the rotation of the motor. This setup renders the system very secure. When a power outage or an electric default occurs, the cable system 12 will be brake automatically, even if running at high speed. This feature prevents the carrier 24 from crashing into the towers.
Preferably, the electric panel 38 includes a protection filter 102 for the electric supply of the system. This power filter 102 regulates or stabilizes the voltage and protects the system from lightening, using light arresters 122.
Also preferably, the system is provided with a remote communication system 132. This system can be done using a telephone line and a modem in order to communicate with the controller 38 and the drive 23 remotely. This communication system 132 allows to diagnose problems at any time regardless of the location of the installation. This communication system 132 allows to remotely monitor the good functioning of the system, and to proceed with preventive maintenance and troubleshooting of the system, if required.
Still preferably, the control console 64 can easily be disconnected from the electric panel 38 when the cable system is shut off for an extended period of time. This ensures that the control console be stored in a controlled environment, apart from the electric panel 38.
While throughout this description a boarder is cited in example, the system could be used by a skier or any other type of person needed to be pulled or towed by a back-and-forth cable system.
Although preferred embodiments of the present invention have been described in detail herein and illustrated in the accompanying drawings, it is to be understood that the invention is not limited to these precise embodiments and that various changes and modifications may be effected therein without departing from the scope or spirit of the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2696927 | Mar 2010 | CA | national |
| Number | Name | Date | Kind |
|---|---|---|---|
| 1546031 | Schofield | Jul 1925 | A |
| 3052470 | Pomagalski | Sep 1962 | A |
| 3080164 | Davis | Mar 1963 | A |
| 3376829 | Hancock | Apr 1968 | A |
| 4082193 | Teague | Apr 1978 | A |
| 4310283 | Teague | Jan 1982 | A |
| 4523525 | Foster | Jun 1985 | A |
| 5072534 | Kodet | Dec 1991 | A |
| 6937911 | Watson | Aug 2005 | B2 |
| 8166886 | Thum | May 2012 | B2 |
| Number | Date | Country | |
|---|---|---|---|
| 20120038485 A1 | Feb 2012 | US |
