Abstract:
A method for automatically cycling a torque wrench. The method includes providing a hydraulic torque wrench. Providing an actuating device on the hydraulic torque wrench. Providing a switching device on the hydraulic torque wrench. Adapting the switching device to be activated by the actuating device when a piston of the torque wrench is at the end of a stroke. The embodiments of the method allow a user to ensure that a proper torque on a threaded fastener is achieved. This ensures that the pressure achieved within the system is a result of a proper torque applied to a threaded fastener being achieved, and not a result of the piston at the end of its stroke.

Description:
FIELD 
   The present embodiments relate to an automatic torque regulating hydraulic torque wrench system. 
   BACKGROUND 
   A need exists for a method to automatically cycle and to communicate with a hydraulic pump to ensure that correct torque is achieved. The method needs to determine when the pressure builds up in a hydraulic pump and cylinder is because of the force exerted on a threaded fastener and not due to build up at the end of the stroke of the piston within the hydraulic wrench itself. 
   The present embodiments meet these needs. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The detailed description will be better understood in conjunction with the accompanying drawings as follows: 
       FIG. 1  depicts a flow diagram of an embodiment of the method. 
       FIG. 2  depicts an exploded view of an embodiment of a hydraulic torque wrench usable with the embodiments of the invention. 
       FIG. 3  depicts a schematic of the hydraulic torque wrench system usable with the embodiments of the invention. 
   

   The present embodiments are detailed below with reference to the listed Figures. 
   DETAILED DESCRIPTION OF THE EMBODIMENTS 
   Before explaining the present apparatus in detail, it is to be understood that the apparatus is not limited to the particular embodiments and that it can be practiced or carried out in various ways. 
   The present embodiments relate to a method for automatically cycling a torque wrench. The method can include the step of providing a hydraulic torque wrench. After the torque wrench is provided, a magnet is disposed on the hydraulic torque wrench. It is contemplated that the magnet can be secured to a piston rod of the hydraulic torque wrench. However, the magnet can also be secured to a housing of the hydraulic torque wrench. 
   The method can also include providing a switching device on the hydraulic torque wrench. The switching device can be secured to the housing of the hydraulic torque wrench if the magnet is disposed on the piston rod. In the alternative, the switching device can be provided on the piston rod and the magnet can be disposed on the housing. 
   The switching device is adapted to be activated by the magnet when the piston rod of the torque wrench is at the end of a stroke. For example the switching device can be secured on the housing. The position of the switching device can be such that the magnet will activate the switching device only when the piston rod is at full stroke. 
   The hydraulic torque wrench can be in fluid communication with a directionally controlled pump. An output pressure of the directionally controlled pump is set. For example the output pressure can be set at 1500 psi if the torque required is 175 ft/lbs. The pressure output required for a specific torque is a function of the specific torque wrench and the calculations are well known to one skilled in the art. 
   The method can further include the step of communicating the directionally controlled pump with a processor. The processor can also be in communicated with the switching device. The method can further include adapting the processor to cycle the directionally controlled pump when the switching device is activated. 
   The method can also include sensing the output pressure. For example a pressure transducer can be disposed on the directionally controlled pump for sensing the pressure leaving the directionally controlled pump. The sensed output pressure can be communicated to the processor. 
   An embodiment of the method can include stopping the directionally controlled pump when the sensed output pressure reaches the preset pressure and the switching device is not activated. 
   In another embodiment of the invention an activation device can be used instead of a magnet. For example the activation device can be a mechanical switching device or a laser. 
   The embodiments of the invention can be best understood with reference to the figures. 
     FIG. 1  depicts a flow diagram for an embodiment of the invention. The depicted embodiment for a method for automatically cycling a torque wrench includes step  100  which is providing a hydraulic torque wrench. The torque wrench can be a T Series or LP Series tool Manufactured by Titan Technologies International, Inc., of Houston, Tex. 
   After step  100  is step  102  providing an activation device. The activation device can be a mechanical switch, a laser, a magnet, or can utilize BlueTooth™ technology. The activation device can be movably mounted on the hydraulic torque wrench, for example on the piston rod, or the activation device can be non-movably mounted on the hydraulic torque wrench, for example on the housing. 
   Step  104  is providing a switching device on the hydraulic torque wrench. The switching device can be mounted on the hydraulic torque wrench in either a movable or non-movable fashion depending on how the activation device, such as the magnet, is mounted on the hydraulic torque wrench. For example, if the magnet is movably mounted on the hydraulic torque wrench then the switching device will be non-movably mounted on the hydraulic torque wrench. 
   After step  104  comes step  106 . Step  106  includes adapting the switching device to be activated by the magnet when a piston of the torque wrench is at the end of a stroke. Step  108  includes communicating a directionally controlled pump with the hydraulic torque wrench. 
   In step  109  the output pressure of the directionally controlled pump is set. For example the output pressure can be set at 1500 psi. In step  110  the directionally controlled pump is in communication with a processor. For example the processor can be hardwired to the directionally controlled pump, the processor can be a integrated hardware component of the directionally controlled pump, or the processor can be communicated to the directionally controlled pump using commonly known wireless communication. 
   In step  112  the switching device is in communication with the processor. That is the processor will receive a signal when the switching device is activated. For example a electrical circuit can be completed by sending the signal to the processor. 
   Then in step  114  the processor is adapted to cycle the directionally controlled pump when the switching device is activated. The switching device can cause the valves of the pump or can activate an instantly reversing pump to pump in the other direction. 
   In step  116  the output pressure is sensed. For example a pressure transducer can be used to determine the output pressure of the directionally controlled pump. In step  118  the sensed output pressure is communicated to the processor. 
   In step  120  the processor stops the directionally controlled pump when the sensed output pressure reaches the set output pressure and the switching device is not activated. 
   Referring now to  FIG. 2 , an exploded view of an embodiment of the hydraulic torque wrench  12 . In the depicted embodiment the hydraulic torque wrench has a housing  50 . 
   A fluid portion  14  is secured to a terminal portion  15  of the hydraulic torque wrench  12 . The fluid portion activates a hydraulic piston assembly  16 . The hydraulic piston assembly  16  is depicted including a piston  25 . The hydraulic piston assembly  16  further comprises an end cap  30  for holding the piston  25  and a piston rod  32  enveloped in a piston sleeve  34 . 
   A port  18  is connected to the hydraulic piston assembly. The port  18  is in fluid communication with a directionally controlled pump, as depicted in  FIG. 3 . The port  18  can have a first port  18  and a second port  17 . The first port  18  is an input port, and the second port  17  is an output port. 
   A mechanical drive assembly  20  is engaged by the piston rod  32 . A drive attachment  21  is secured to the mechanical drive assembly  20 . The drive attachment  21  is adapted to engage a threaded fastener  23 . 
   In the depicted embodiment, the piston rod  32  engages a drive pin  37  for driving the mechanical drive assembly  20 . Specifically, the piston rod  32  engages a drive pin  37  for moving the drive pawl  36 . A connector pin  19  couples the piston to the mechanical drive assembly. A magnet  24  is secured to the connector pin  19 , such that the magnet will activate a switching device  26  when the piston is at the end of its stroke. 
   The switching device  26  is fixedly positioned on the interior of the housing  50 . The switching device is adapted to form a signal circuit when the magnet is detected. 
   The mechanical drive assembly  20  has a drive pawl  36 . The mechanical drive assembly  20  is depicted having two drive plates  38   a  and  38   b . A drive ratchet spline  40  is part of the mechanical drive assembly. There are two bushing sleeves  40   a  and  40   b . The bushing sleeves retain the drive bushing and provide the needed robustness for applying torque to threaded fasteners. 
   The mechanical drive assembly  20  can also include two drive bushings  42   a  and  42   b . A holding pawl  44  and a holding pawl release lever  46   a  can be used to release the mechanical drive assembly. 
   Referring now to  FIG. 3 . An embodiment of the hydraulic torque wrench system  10  is depicted. The hydraulic torque wrench  12  is depicted having first port  18  in fluid communication with a directionally controlled pump  28 , using hose  60 . 
   The formed signal circuit  27  is depicted in communication with a processor  31 . The signal circuit is formed when the magnet  24  is sensed by the switching device  26 . For example as the piston travels through its stroke it will reach the end of the stroke, at this time the magnet will activate the switching device and the switching device will form a signal circuit which will notify the processor that the piston is at the end of its stroke. The signal circuit can be communicated to the processor by wireless transmission, hard wired transmission, fiber optics, or other similar forms of signal transmission. 
   The directionally controlled pump  28  is in fluid communication with the hydraulic wrench  12  in such as manner as to supply hydraulic fluid to the hydraulic wrench and to receive hydraulic fluid from the hydraulic wrench. In the depicted embodiment the hydraulic fluid is supplied using hose  60  and port  18 . The fluid is received using the second port  17  and hose  61 . It is possible to have the directionally controlled pump to only supply hydraulic fluid to the hydraulic wrench, and to have a separate reservoir for receiving hydraulic fluid from the hydraulic wrench. 
   The directionally controlled pump can have a pressure setting device  35 . The pressure setting device  35  can be a digital sensor, an analog sensor, or a mechanical device such as a pressure relief valve. The pressure setting device will set the pressure at which the hydraulic fluid is supplied to the hydraulic wrench. The pressure is determined by the torquing requirements. The pressure setting device is depicted in communication with the processor. 
   While these embodiments have been described with emphasis on the embodiments, it should be understood that within the scope of the appended claims, the embodiments might be practiced other than as specifically described herein.