Patent Description:
Pipe threading devices may form threads on an outer surface of a pipe. In a handheld modification device such as a pipe threading device, ergonomic balance of the components of the device may improve user control of the device, and enhance operational safety. An adjustable clamping mechanism may secure a position of a variety of different size workpieces relative to the device, improving the accuracy of the modification of the workpiece performed by the tool, allowing for relatively rapid transition from one workpiece to the next, and enhancing operational safety. Control of a motor, particularly in response to detected displacement indicative of kickback of the device relative to the workpiece, may also enhance utility and operational safety.

<CIT> discloses a thread forming system according to the preamble of claim <NUM>.

<CIT> discloses a supporting structure for a portable power tool. <CIT> discloses a machining tool.

The invention provides a thread forming system according to claim <NUM>.

In some implementations, in a first position of the latch handle and the link, the upper support bracket may be rotatable relative to the lower support bracket. In a second position of the latch handle and the link, rotation of the upper support bracket relative to the lower support bracket may be restricted, such that a relative position of the upper support bracket and the lower support bracket may be secured. The latch handle and the link may be moved from the first position to the second position in response to rotation of the latch handle about the first pivot pin in a first direction, in which the second pivot pin and the first end portion of the link are moved past an alignment position with the first pivot pin and the third pivot pin.

In some implementations, a fourth pin may rotatably couple an end portion of a release handle to the latch handle. In the first position, the release handle may be aligned along the latch handle. In the second position, the release handle may be rotated about the fourth pivot pin such that the release handle may be separated from the latch handle. The second pivot pin and the first end portion of the link may be rotated away from the lower support bracket in response to rotation of the release handle toward the latch handle to allow rotation of the upper support bracket and the lower support bracket.

In some implementations, the clamping device may include a threaded adjustment knob on the one of the upper support bracket or the lower support bracket. A position of one of the first clamping face or the second clamping face may be movable relative to the other of the first clamping face or the second clamping face in response to manipulation of the threaded adjusting knob. In some implementations, the first clamping face may be stationary, and the second clamping face may be movable in a first direction toward the first clamping face in response to manipulation of the threaded adjusting knob in a first direction, and the second clamping face may be movable in a second direction away from the first clamping face in response to manipulation of the threaded adjusting knob in a second direction.

In some implementations, the tool housing may extend transverse to the piece of stock when the cutting head is forming threads, and the reaction arm may extend transverse to the tool housing when the cutting head is forming threads.

In some implementations, the biasing arm may be pivotable relative to the clamping device. In some implementations, the biasing device may include a biasing plate coupled to a second end portion of the biasing arm. The biasing plate may be configured to selectively contact the cutting head based on a position of the biasing arm relative to the clamping device. The biasing plate may be configured to transfer an axial force to the cutting head in response to an external force applied to the biasing device, as the as the biasing arm and the biasing plate pivot relative to the clamping device, and toward the cutting head.

In some implementations, the power tool may include a motor for driving the cutting head, a motion sensor configured to sense rotational motion of the housing about the longitudinal axis, and a controller configured to control operation of the motor and to initiate a protective operation when the sensed rotational motion exceeds a predetermined threshold. The sensed rotational motion may include at least one of a rotational displacement, a rotational velocity, or a rotational acceleration. The protective operation may include at least one of shutting off power to the motor, reducing power to the motor, pulsing power to the motor, braking the motor, or reversing a direction of rotation of the motor. The sensor may be at least one of a gyroscope or an accelerometer.

In some implementations, the tool housing may include a battery housing defining an internal cavity configured to receive a battery, a motor housing adjacent to the battery housing that contains a motor, and a transmission positioned between the motor housing and the cutting head, the transmission housing containing a transmission that is driven by the motor. In some implementations, the power tool may also include a first handle coupled to a first end portion of the tool housing, such that the battery housing is positioned between the first handle and the motor housing, and a second handle coupled to the cutting head. A center of gravity of the power tool may be positioned along the tool housing, at a position substantially aligned with the second handle.

An embodiment of a thread forming system according to the invention is shown in <FIG>. The system comprises a power tool that includes a cutting head configured to form threads in an elongated piece of stock. Such elongated stock to be modified by such a power tool or system, may be referred to as a pipe hereinafter, simply for ease of discussion and illustration. However, the principles to be described herein may apply to various different types of elongated stock.

The exemplary power tool <NUM>, in the form of an exemplary thread forming tool <NUM>, or pipe threader <NUM>, is shown in <FIG> and <FIG>, in which <FIG> is a side view and <FIG> is a cross-sectional view of the exemplary pipe threader <NUM>. The exemplary pipe threader <NUM> includes a tool housing <NUM>, including a battery housing <NUM>, a motor housing <NUM>, and a transmission housing <NUM> sequentially arranged along a longitudinal direction of the pipe threader <NUM>. An operating head <NUM>, or head portion <NUM>, is positioned at a working end portion, or forward end portion of the pipe threader <NUM>. One of a plurality of different cutting dies <NUM> (see, for example, <FIG> and <FIG>) is removably received in the operating head <NUM>, or operating portion <NUM>. A first handle <NUM>, or rear handle <NUM>, may be positioned at a first end portion of the housing <NUM>, adjacent to the battery housing <NUM>. A second handle <NUM>, or front handle <NUM>, is positioned at a second end portion of the housing <NUM>, proximate the operating head <NUM> and/or the transmission housing <NUM>. The front handle <NUM> may include, for example, retaining portion coupled to the operating head <NUM>, including a retaining slot <NUM>, and a grasping portion <NUM>.

The battery housing <NUM> defines an internal cavity <NUM> in which a power storage device, or battery125, may be removably received. In some implementations, a cover <NUM> may be coupled, for example, rotatably coupled, to the battery housing <NUM> to selectively open and close an opening into the cavity <NUM> for removal of the battery <NUM> from the cavity <NUM>, and for replacement of the battery <NUM> into the cavity <NUM>. The cover <NUM> may prevent unwanted material such as, for example, debris, moisture and the like, from entering the cavity <NUM> of the battery housing <NUM>. The cover <NUM> may also contribute to the retention of the battery <NUM> in the cavity <NUM> of the battery housing <NUM>, for example, during operation, transport, set up, and the like.

In some implementations, an indicator panel <NUM> may be provided on the housing <NUM>. The indicator panel <NUM> may provide external indicators to an operator, related to operation of the pipe threader <NUM>. For example, in some implementations, the indicator panel <NUM> may be selectively illuminated and/or selectively display one or more illumination patterns, to indicate an on/off state of the pipe threader <NUM>, a capacity/charge level of the battery <NUM> received in the battery housing <NUM>, and the like.

A motor <NUM> is received in the motor housing <NUM>. In some implementations, the motor <NUM> may be, for example, a brushless, bi-directional motor <NUM>. That is, in some implementations, the motor <NUM> may be selectively operable in a forward direction, and in a reverse direction. In some implementations, an operational speed of the motor <NUM> may be varied, or changed, based on, for example, user selection. In some implementations, an operational speed of the motor <NUM> may be varied, or changed, based on, for example, an operation direction or mode of the motor <NUM>. In some implementations, an operational direction, or operational mode, of the motor <NUM>/pipe threader <NUM> may be selected by manipulation of a motor control switch <NUM>, or forward/reverse switch <NUM>, allowing for selection of one of a plurality of operational speeds of the motor <NUM> and/or selection of an operation direction of the motor <NUM>. In some implementations, changes in the operational direction of the motor <NUM> may be achieved mechanically, by a reversing mechanism operably coupled with, for example, the motor <NUM> and/or the transmission <NUM> received in the transmission housing <NUM>.

As noted above, the cutting die <NUM> may be removably received in the operating head <NUM>, as shown in more detail in <FIG>. In some implementations, the operating head <NUM> may accommodate one of a plurality of different cutting dies <NUM>, as shown in <FIG>. The plurality of cutting dies <NUM> may have different sizes, for cutting and/or forming threads on differently sized pipes, conduit, tubes, rods and the like. In some implementations, cutting dies <NUM> may be configured for forming external threads on an outer circumferential portion of a piece of stock. In some implementations, cutting dies <NUM> may be configured for forming internal threads on an inner circumferential portion of a piece of stock. use, one of the plurality of cutting dies <NUM> may be selected, based on, for example, a size (i.e., a diameter) of a piece of stock to be threaded. In some implementations, the selected cutting die <NUM> may include a plurality of engagement recesses <NUM> formed in a housing of the cutting die <NUM>. The plurality of engagement recesses <NUM> formed in the housing of the cutting die <NUM> may receive a respective plurality of die head engagement pins <NUM> installed in an inner circumferential portion of the operating head <NUM>. In some implementations, the plurality of die head engagement pins <NUM> may be spring biased, for example, in a radially inward direction. Engagement of the plurality of engagement pins <NUM> in the plurality of engagement recesses <NUM> may retain a position of the cutting die <NUM> relative to, for example, an output gear installed in the operating head <NUM>, such that the cutting die <NUM> and the output gear rotate together in the engaged state.

With the selected cutting die <NUM> coupled in the operating head <NUM> of the pipe threader <NUM> as described above, a piece of stock is inserted into the cutting die <NUM>. Power may be applied to the motor <NUM> by, for example, manipulation of a power switch <NUM>, or trigger <NUM>. A force generated by operation of the motor <NUM> in a first direction (for example, the forward direction) is transmitted to the cutting die <NUM> via a transmission <NUM> received in the transmission housing <NUM>. This force , in turn, rotates the cutting die <NUM> in the first direction, causing the cutting die <NUM> to engage with an end portion of the piece of stock. For example, in a cutting die <NUM> configured for forming external threads in an outer circumferential portion of a piece of stock, rotation of the cutting die <NUM> in the first direction may cause the cutting die <NUM> to engage with the outer circumferential portion of the piece of stock positioned in the cutting die <NUM>. In this exemplary arrangement, as the cutting die <NUM> rotates in the first direction relative to the piece of stock (for example, pipe), the cutting die <NUM> may move in a first axial direction along the pipe, as the cutting die <NUM> cuts threads into the outer circumferential portion of the pipe. When the cutting of the threads is completed, a direction of operation of the motor <NUM> may be reversed, for example, by manipulation of the forward/reverse switch <NUM>. Operation of the motor <NUM> in the second direction, for example, the reverse direction, may cause the cutting die <NUM> to rotate in the second direction, and the cutting die <NUM> to move in a second axial direction along the pipe, and through the previously cut threads, releasing the engagement of the pipe and the cutting die <NUM>. This will be described in more detail below.

In some implementations, the arrangement of the internal components of the pipe threader <NUM> may provide for ergonomic balance of the pipe threader <NUM>. Ergonomic balance of the pipe threader <NUM> may improve user control during operation of the pipe threader <NUM>, may improve precision of the modifications made to the workpiece/elongated stock during operation, and may enhance safety during operation of the pipe threader <NUM>. <FIG> illustrates the relative placement of various internal components of the exemplary pipe threader <NUM>, which may contribute to providing for ergonomic balance of the pipe threader <NUM>.

As shown in <FIG> and <FIG>, the battery <NUM> may be removably received in the internal cavity <NUM> formed in the battery housing <NUM>. As noted above, the cover <NUM> may selectively open and close the opening into the internal cavity <NUM>. Enclosure of the battery <NUM> in the battery housing <NUM> may retain the battery <NUM> in a secured state, and/or in a connected state, in the battery housing <NUM>. Enclosure of the battery <NUM> in the battery housing <NUM>, and in particular, with the cover <NUM> closed against the internal cavity <NUM>, may preclude the infiltration of external debris into the housing <NUM>, and may preclude damage to the battery <NUM>.

As shown in <FIG> and <FIG>, the motor <NUM> is received in the motor housing <NUM>. The motor <NUM> may be connected, for example, by wires, to receive power from the battery <NUM>. A supply of power from the battery <NUM> to the motor <NUM> may be controlled by, for example, a power control board <NUM> selectively supplying power to the motor <NUM>. The power control board <NUM> may control the supply of power to the motor <NUM> in response to, for example, manipulation of the motor control switch <NUM>, or forward/reverse switch <NUM>, a position of the power switch <NUM>, or trigger <NUM>, and the like. In some implementations, the power control board <NUM> may include a motion sensing device 138A. In some implementations, the motion sensing device 138A may detect a displacement and/or a velocity and/or an acceleration of the pipe threader <NUM> during operation. In some implementations, the motion sensing device 138A may include at least one of an accelerometer, a gyroscope and other such sensors. In some implementations, the power control board <NUM> may control operation of the motor <NUM> in a protection mode in response to detection of a displacement, and/or a velocity, and/or an acceleration, of the pipe threader <NUM> that is greater than a corresponding set threshold value. For example, in the protection mode of operation, the power control board <NUM> may control the supply of power to the motor <NUM> to reduce, or suspend, operation of the motor <NUM>, reverse an operation direction of the motor <NUM>, and the like.

As shown in <FIG> and <FIG>, the transmission <NUM> is received in the transmission housing <NUM>. The transmission <NUM> may transfer power from the motor <NUM> to the cutting die <NUM> received in the operating head <NUM> of the pipe threader <NUM>. That is, as described above, the transmission <NUM> transmits force from the motor <NUM> (operating in the first direction) to the cutting die <NUM>, causing the cutting die <NUM> to rotate in the first direction. Similarly, the transmission <NUM> may transmit force from the motor <NUM> (operating in the second direction) to the cutting die <NUM>, causing the cutting die <NUM> to rotate in the second direction. The transmission <NUM> will be described in more detail with respect to <FIG> and <FIG>.

<FIG> is a side view, <FIG> is a perspective view, and <FIG> is an end view, of the exemplary transmission <NUM> to be received in the transmission housing <NUM> of the exemplary pipe threader <NUM>. In some implementations, a support plate <NUM> may be positioned between the motor housing <NUM> and the transmission housing <NUM>, to, for example, support a coupling between the motor <NUM> and the transmission <NUM>. The exemplary transmission <NUM> may be coupled to a motor pinion <NUM> mounted on an output shaft <NUM> of the motor <NUM>. The exemplary transmission <NUM> may be, for example, a parallel axis transmission. A first reduction gear <NUM>, mounted on a first shaft <NUM> of the exemplary transmission <NUM>, may mesh with the motor pinion <NUM> to transfer power from the motor <NUM> to the transmission <NUM>. Rotation of the first reduction gear <NUM> (in response to force transmitted thereto from the motor <NUM> via the motor pinion <NUM>) may rotate a first reduction pinion <NUM> also mounted on the first shaft <NUM>. The first reduction pinion <NUM> may, in turn, mesh with a second reduction gear <NUM>, mounted on a second shaft <NUM>, to rotate the second reduction gear <NUM>. Rotation of the second reduction gear <NUM> may rotate a second reduction pinion <NUM>, also mounted on the second shaft <NUM>. The second reduction pinion <NUM> may, in turn, mesh with a third reduction gear <NUM> mounted on a third shaft <NUM>, to rotate the third reduction gear <NUM> and a third reduction pinion <NUM> also mounted on the third shaft <NUM>. The third reduction pinion <NUM> may, in turn, mesh with a fourth reduction gear <NUM>.

In some implementations, the fourth reduction gear <NUM> may be an output gear <NUM>, in the form of, for example, a bevel gear <NUM> that also changes the direction of rotation by <NUM> degrees. The bevel gear <NUM>, or output gear <NUM>, may transfer the force generated by the motor <NUM> to the operating head <NUM> of the pipe threader <NUM>, to provide for the rotation of the cutting die <NUM>. In some implementations, the bevel gear <NUM>, or output gear <NUM>, may be housed in a housing of the operating head <NUM>, against a bearing ring. The force, or torque, generated by the motor <NUM> may be transmitted to the bevel gear <NUM>, or output gear <NUM>, through the parallel axis arrangement described above. This arrangement of the components of the transmission <NUM> may cause the bevel gear <NUM>, or output gear <NUM>, to rotate at a slower speed than the motor <NUM>. This transfer of force to the operating head <NUM> may rotate the cutting die <NUM> received in the operating head <NUM>. Rotation of the cutting die <NUM> may cause threads to be cut into an outer circumferential portion of a piece of elongated stock, such as, for example, a pipe, received in the cutting die <NUM> as described above.

The exemplary transmission <NUM> shown in FIGs. 8A-3C is a parallel axis transmission, for purposes of discussion and illustration. In some implementations, other arrangement(s) of transmission components such as, for example, a planetary transmission design, may transfer force, i.e., rotational force, from the motor <NUM> to the operating head <NUM>.

In the exemplary pipe threader <NUM> shown in <FIG> and <FIG>, the arrangement of components shown in <FIG> may contribute to a positioning of a center of gravity CG of the pipe threader <NUM> at a location which provides for ergonomic balance of the pipe threader <NUM>. That is, in the exemplary pipe threader <NUM> having the battery housing <NUM> (and the battery <NUM>) positioned forward of the rear handle <NUM>, the center of gravity CG of the exemplary pipe threader <NUM> may be substantially aligned with the front handle <NUM>, as shown in <FIG>. This arrangement of components may provide for ergonomic balance of the pipe threader <NUM>, which may improve user control of the device, may enhance operational safety, and may improve long term durability of the pipe threader <NUM>.

In some implementations, a pipe threader 100A, in accordance with implementations described herein, may have a tool housing 110A including a battery housing 120A, a motor housing 130A, a transmission housing 140A, and a operating head 150A, that are arranged as shown in <FIG>. In the exemplary pipe threader 100A shown in <FIG>, the battery <NUM> may be received in the battery housing 120A, the motor <NUM> may be received in the motor housing 130A, and the transmission may be received in the transmission housing 140A, substantially as described above with respect to the pipe threader <NUM> shown in <FIG> and <FIG>. However, in the pipe threader 100A shown in <FIG>, the battery/battery housing 120A is positioned at the first end portion of the pipe threader 100A, with a first handle 160A, or rear handle 160A, positioned between the battery/battery housing 120A and the motor housing 130A, and a second handle 170A positioned proximate the transmission housing 140A and operating head 150A. In the exemplary pipe threader 100A shown in <FIG>, with components arranged in this manner, a center of gravity CGA of the exemplary pipe threader 100A may be positioned as shown in <FIG>. This may provide for some measure of ergonomic balance of the exemplary pipe threader 100A.

The arrangement of components of the exemplary pipe threader <NUM> shown in <FIG> and <FIG>, with the battery housing <NUM> (and battery <NUM>) positioned forward of the rear handle <NUM>, and the center of gravity CG substantially aligned with the front handle <NUM>, may provide improved rigidity of the housing <NUM>, and of the pipe threader <NUM>, particularly in a central portion of the pipe threader <NUM>, compared to that of the exemplary pipe threader 100A shown in <FIG>. The improved rigidity provided by the arrangement shown in <FIG> and <FIG> may further improve stability of the pipe threader <NUM> during use, and may further improve user control and operational safety.

<FIG> is a perspective view of the exemplary thread forming system <NUM>, in accordance with the invention. The exemplary thread forming system <NUM>, shown in <FIG> includes the exemplary pipe threader <NUM> described above with respect to <FIG> and <FIG>, for purposes of discussion and illustration. The exemplary thread forming system <NUM>, shown in <FIG> also includes the support device <NUM> that maintains, or secures, a position of a piece of elongated stock <NUM>, or pipe <NUM>, relative to the exemplary pipe threader <NUM>. The support device <NUM>, in accordance with implementations described herein, withstands relatively high torque during operation of the pipe threader <NUM>. The support device <NUM>, in accordance with implementations described herein, allows an axial biasing force to be applied to the cutting die <NUM> installed in the operating head <NUM> of the pipe threader <NUM>. The axial biasing force applied to the cutting die <NUM> allows the cutting die <NUM> to engage an end portion of the elongated stock <NUM>, to initiate threading of the elongated stock <NUM>.

<FIG> is a perspective view of the support device <NUM>, in accordance with implementations described herein. <FIG> is a perspective view of the support device <NUM>, with a biasing device <NUM> removed, so that other components of the support device <NUM> are more easily visible.

As shown in <FIG> and <FIG>, the support device <NUM> includes a clamping device <NUM> that provides for coupling of the stock <NUM>, or pipe <NUM>, and the support device <NUM>. In some implementations, the clamping device <NUM> may be selectively adjusted in response to manipulation of an adjustment device <NUM>. The clamping device <NUM> is selectively engaged with the stock <NUM>, or pipe <NUM>, and disengaged from the stock <NUM>, or pipe <NUM>, in response to manipulation of a latching device <NUM>. The support device <NUM> includes a reaction arm device <NUM> that is configured to abut, the pipe threader <NUM>, to inhibit or restrict rotation of the pipe threader <NUM>. In particular, engagement of the reaction arm device <NUM> and the pipe threader <NUM> may inhibit, or restrict, or prevent rotation of the pipe threader <NUM> about the axis of rotation A of the cutting die <NUM>/cutting head portion of the operating head <NUM>, thus stabilizing a position of the pipe threader <NUM> during operation. The support device <NUM> also includes a biasing device <NUM> that may be rotatably coupled to the clamping device <NUM>, and selectively engage the cutting die <NUM> installed in the operating head <NUM> of the pipe threader <NUM>. An engagement of the biasing device <NUM> with the cutting die <NUM> allows an axial force to be safely applied to the cutting die <NUM>, and may allow the cutting die <NUM> to, in turn, engage the end portion of the pipe <NUM> held by the clamping device <NUM> as the cutting die <NUM> rotates.

As shown in <FIG> and <FIG>, the support device <NUM> includes a first support bracket <NUM>, or upper support bracket <NUM>, and a second support bracket <NUM>, or lower support bracket <NUM> rotatably coupled to a first end portion of the upper support bracket <NUM>. The clamping device <NUM> includes a first clamping face <NUM>, or upper clamping face <NUM>, on an upper jaw <NUM> of the upper support bracket <NUM>, and a second clamping face <NUM>, or lower clamping face <NUM>, on a lower jaw <NUM> of the lower support bracket <NUM>. The upper clamping face <NUM> and the lower clamping face <NUM> is configured to engage the piece of elongated stock <NUM> to be held, or supported, by the support device <NUM> during operation of the pipe threader <NUM>. In some implementations, the upper clamping face <NUM> and/or the lower clamping face <NUM> may include pads, which may be removable/replaceable wear items on the support device <NUM>.

In some implementations, one of the upper clamping face <NUM> or the lower clamping face <NUM> may remain stationary, while the other of the upper clamping face <NUM> or the lower clamping face <NUM> may be moveable, so that the upper and lower clamping faces <NUM> and <NUM> may be moved into contact, or engagement, with a piece of stock <NUM>, or pipe <NUM>. In the exemplary arrangement shown in <FIG>, the upper clamping face <NUM> may remain stationary, or fixed, on the upper support bracket <NUM>, and a position of the lower clamping face <NUM> may be moved, or adjusted, in response to manipulation of the adjustment device <NUM>.

In some implementations, the adjustment device <NUM> may include a threaded adjusting knob <NUM> mounted on a threaded rod <NUM>. The lower clamping face <NUM> may be coupled to an end portion of the threaded rod <NUM>. As the adjusting knob <NUM> is manipulated, for example, rotated, on the threaded rod <NUM>, the adjusting knob <NUM> may move axially along the threaded rod <NUM>. As the adjusting knob <NUM> is rotated in a first direction, the lower clamping face <NUM> may be moved upward, in a direction toward the upper clamping face <NUM>, in response to rotation of the adjusting knob <NUM> in the first direction and corresponding upward movement of the threaded rod <NUM>, while the lower support bracket <NUM>/side plate <NUM> remains stationary, as shown in <FIG>. Similarly, as the adjusting knob <NUM> is rotated in a second direction, the lower clamping face <NUM> may be moved downward, in a direction away from the upper clamping face <NUM>, in response to rotation of the adjusting knob <NUM> in the second direction and corresponding downward movement of the threaded rod <NUM>, while the lower support bracket <NUM>/side plate <NUM> remains stationary, as shown in <FIG>.

This type of manipulation of the adjustment device <NUM> may allow the clamping device <NUM> to be tightened against the pipe <NUM>, to secure a position of the pipe <NUM> for threading. This type of manipulation of the adjustment device <NUM> may allow the clamping device <NUM> to be released from the pipe <NUM>, to allow the pipe <NUM> to be removed after threading is complete. This type of manipulation of the adjustment device <NUM> may allow the clamping device <NUM> to accommodate different sizes and/or configurations of elongated stock <NUM> in the support device <NUM>. For example, <FIG> illustrates a first pipe 10A secured in the support device <NUM>, and <FIG> illustrates a second pipe 10B secured in the support device <NUM>, a diameter of the second pipe 10B being greater than a diameter of the first pipe 10A. In this example, the adjustment device <NUM> has been manipulated to properly position the upper and lower clamping faces <NUM>, <NUM> of the clamping device <NUM> to receive and secure the respective pipes 10A and 10B in the support device <NUM>.

In some implementations, the adjustment device <NUM> may include a scale indicator <NUM> that is visible to the operator, to facilitate adjustment of the position of the clamping faces <NUM>, <NUM>. In the exemplary implementation shown in <FIG> and <FIG>, the scale indicator <NUM> is provided on the lower jaw <NUM>. In this exemplary arrangement, the user may read the scale indicator <NUM> through a slot <NUM> formed in a side plate <NUM> of the lower support bracket <NUM>. Reading of the scale indicator <NUM> in this manner may provide the user with indexing, facilitating the accommodation of a particular size of pipe <NUM> between the clamping faces <NUM>, <NUM>. This ability to rapidly adjust the spacing between the upper and lower jaws <NUM>, <NUM> may facilitate the rapid accommodation of pieces of stock <NUM> within the clamping faces <NUM>, <NUM> of the jaws <NUM>, <NUM>.

According to the invention, the thread forming system comprises a latching device <NUM>. The latching device <NUM> may be actuated, or engaged, to selectively inhibit, or restrict, relative rotation of the upper support bracket <NUM> and the lower support bracket <NUM>, and maintain a secured position of the elongated stock <NUM> in the support device <NUM>. For example actuation of the latching device <NUM> may maintain the respective positions of the components of the support device <NUM>, and of the pipes <NUM> supported in the support device <NUM>, as shown in <FIG> and <FIG>. Similarly, the latching device <NUM> may be disengaged, or released, to allow for the relative rotation of the upper support bracket <NUM> and the lower support bracket <NUM>, and for the release of the stock <NUM>, or pipes <NUM>, from the support device <NUM>.

As shown in <FIG>, the latching mechanism <NUM> includes a latch handle <NUM> rotatably coupled to the first end portion of the upper support bracket <NUM> at a first pivot pin <NUM>. A link <NUM> is rotatably coupled between the latch handle <NUM> and the lower support bracket <NUM>. A first end portion of the link <NUM> is rotatably coupled to the latch handle <NUM> at a second pivot pin <NUM>, and a second end portion of the link <NUM> is rotatably coupled to the lower support bracket <NUM> at a third pivot pin <NUM>. <FIG> illustrates the latching device <NUM> in a disengaged, or unactuated position. From the position shown in <FIG>, a piece of stock <NUM> may be positioned in the clamping device <NUM>, i.e., between the first and second clamping faces <NUM>, <NUM>, and the adjustment device <NUM> may be manipulated to secure the stock <NUM> in the clamping device <NUM>, as shown in <FIG>. The latching device <NUM> may then be actuated to inhibit, or restrict, relative rotation of the upper and lower support brackets <NUM>, <NUM>, and maintain the secured, clamped position of the stock <NUM> in the clamping device <NUM>.

To actuate the latching device <NUM>, the latch handle <NUM> is rotated from the position shown in <FIG>, through the interim position shown in <FIG>, and into the position shown in <FIG>. At the interim position shown in <FIG>, the link <NUM> is at a top dead center position, in which the first pivot pin <NUM>, the second pivot pin <NUM> and the third pivot pin <NUM> are aligned in a straight line. As the link <NUM> rotates past the top dead center position, and into the position shown in <FIG>, the first end portion of the link <NUM> and the second pivot pin <NUM> are offset from the first pivot pin <NUM> and the third pivot pin <NUM>. In this position of the link <NUM> (and the latch handle <NUM>), rotation of the upper support bracket <NUM> and the lower support bracket <NUM> is inhibited, or restricted, thus maintaining the clamped position of the first and second clamping faces <NUM>, <NUM> against the piece of stock <NUM>. In some implementations, the link <NUM> may be adjustable in length, to provide for fine adjustment of the latching provided by the latching device <NUM>.

Actuation of a release lever <NUM> may release, or disengage, the latching device <NUM>, allowing for rotation of the upper and lower support brackets <NUM>, <NUM>, and removal of the piece of stock <NUM> from the support device <NUM>. That is, as shown in <FIG>, application of an external force on the release lever <NUM>, in the direction of the arrow F, pushing the release lever <NUM> toward the latch handle <NUM>, may release, or disengage, the latching device <NUM>, as shown in <FIG>. In the position shown in <FIG> and <FIG>, the upper end portion of the release lever <NUM> is in contact with the link <NUM>. In response to application of the force F, the upper end portion of the release lever <NUM> cams against the link <NUM>, snapping the link <NUM> out of the locked, or latched, position, and releasing or disengaging the latching device <NUM>.

The ability to latch, and unlatch, the support device <NUM> in the manner described above, may allow for a relatively rapid removal of a completed work piece, and placement of a new work piece in the support device <NUM>, particularly when processing work pieces of essentially the same size (i.e., diameter). Manipulation of the adjustment device <NUM> as described above may provide for fine adjustment of the positioning of the clamping faces <NUM>, <NUM> in securing the work piece in the support device <NUM>.

Returning back to the exemplary system <NUM> shown in <FIG>, the piece of elongated stock <NUM> (such as the exemplary pipe <NUM> referenced above for purposes of description and illustration) may be secured by the support device <NUM> as described with respect to <FIG>. The exemplary pipe threader <NUM>, may be positioned at the end portion of the pipe <NUM>. The end of the pipe <NUM> may be positioned in the operating head <NUM> of the pipe threader <NUM>, for example, in the cutting die <NUM> installed in the operating head <NUM>, so that operation of the pipe threader <NUM> may cause threads to be formed in the end portion of the pipe <NUM>.

As described above and shown in <FIG>, operation of the motor <NUM> in the first direction (for example, the forward direction) may cause corresponding rotation of the cutting die <NUM> in the first direction R1 about the axis of rotation A of the cutting die <NUM> and/or the central longitudinal axis A of the elongated piece of stock <NUM> received in the cutting die <NUM>. As the cutting die <NUM> is installed in, and fixed in the die housing of the operating head <NUM> of the pipe threader <NUM>, this rotation of the cutting die <NUM> may cause rotation of, essentially the entire pipe threader <NUM> about the axis of rotation A. Without the reaction arm device <NUM>, this resulting rotation of the pipe threader <NUM> would require the user to maintain an external force in the direction R3 on the pipe threader <NUM> to maintain safe, stable operation of the pipe threader <NUM>. The reaction arm device <NUM> includes a reaction arm <NUM> coupled to the clamping device <NUM> of the support device <NUM>. A first end portion of the reaction arm <NUM> may be coupled to the upper support bracket <NUM>, and a second end portion of the reaction arm <NUM> may be configured to abut a portion of the pipe threader <NUM>, so as to inhibit, or restrict, rotation of the pipe threader <NUM> about the axis of rotation A, during operation of the motor <NUM> and corresponding rotation of the cutting die <NUM> engaged with the pipe <NUM>. For example, the second end portion of the reaction arm <NUM> may be configured to engage a retaining portion of the pipe threader <NUM>.

In the example shown in <FIG>, the retaining portion of the pipe threader <NUM> is defined by a slot <NUM> formed in the front handle <NUM>, in which the second end portion of the reaction arm <NUM> is received. In some implementations, the retaining portion may be defined by, for example, a lower surface <NUM> of the front handle <NUM>, an outer surface <NUM> of the operating head/housing <NUM> of the pipe threader <NUM>, and the like, which the second end portion of the reaction arm <NUM> may abut, or contact, so as to inhibit or restrict rotation of the pipe threader <NUM>. Engagement, for example, physical engagement, of the reaction arm <NUM> with the pipe threader <NUM> in this manner may inhibit, or restrict, or prevent rotation of the pipe threader <NUM> about the axis of rotation of the cutting die <NUM>/cutting head of the operating head <NUM>, thus stabilizing a position of the pipe threader <NUM> during operation. For example, in some implementations, the support device <NUM> may include a slot, similar to the slot <NUM> shown in <FIG>, in which such a reaction arm of the pipe threader <NUM> may be received. Engagement in this manner may stabilize a relative position of the pipe threader <NUM>, the support device <NUM>, and the piece of stock <NUM>, during operation.

An exemplary biasing device <NUM> is illustrated in <FIG>. In particular, <FIG> is a perspective view of the exemplary support device <NUM> including the exemplary biasing device <NUM>, with a pipe secured in the support device <NUM>. In the exemplary arrangement shown in <FIG>, the cutting die <NUM> is positioned on the end portion of the pipe <NUM>, but not installed in the operating head <NUM> of the pipe threader <NUM>, simply so that components of the support device <NUM> are more easily visible. <FIG> are cross sectional views of operation of the exemplary biasing device <NUM>, in accordance with implementations described herein. In the example shown in <FIG>, the biasing device <NUM> is rotatably coupled to the upper support bracket <NUM> of the clamping device <NUM>, such that an axial biasing force may be applied to the cutting die <NUM> by a downward application of external force to the biasing device <NUM>.

Threading of a piece of elongated stock <NUM>, such as, for example a pipe <NUM>, by the exemplary pipe threader <NUM>, may require that an axial force is applied to the cutting die <NUM>, while the cutting die <NUM> is rotating, to initiate engagement between the cutting die <NUM> and the outer circumferential surface of the pipe <NUM>, and initiate the cutting of threads into the pipe <NUM>. For example, in some situations, an operator may place a hand directly on the outer facing side of the cutting die <NUM>, while the cutting die <NUM> is rotating, to urge the rotating cutting die <NUM> onto the pipe <NUM> and initiate threading. This direct contact between the hand of the user and the rotating cutting die <NUM> may present safety hazards during operation, and/or may not yield the desired results. That is, this direct contact with the rotating cutting die <NUM> may expose the hand of the user to burrs, metal debris, burning, blistering and the like. Additionally, depending on the size and/or type of stock <NUM> being modified, an operator may not be able to produce sufficient axial force in this manner, and/or may cause instability in the mounting of the stock <NUM> and/or fixture when applying an axial force in this manner. Accordingly, a biasing device <NUM> allows an operator to apply an axial biasing force to the rotating cutting die <NUM> safely, and with relatively less effort.

In the exemplary biasing device <NUM> shown in <FIG>, the biasing device <NUM> is coupled, for example, rotatably coupled, to the clamping device of the support device <NUM>. In the exemplary biasing device <NUM> shown in <FIG>, the biasing device <NUM> is rotatably coupled to the upper support arm <NUM>, for purposes of discussion and illustration. The exemplary biasing device <NUM> includes a biasing arm <NUM>, with a first end portion of the biasing arm <NUM> being rotatably coupled to the upper support bracket <NUM>. A biasing plate <NUM> may be coupled to a second end portion of the biasing arm <NUM>. In some implementations, the biasing device <NUM> may include a biasing handle <NUM> to facilitate the rotation of the biasing device <NUM>, and the application of the axial biasing force. The operator may rotate the biasing arm <NUM>, so as to selectively bring the biasing plate <NUM> into contact with the outward facing side 155A of the cutting die <NUM>.

In particular, in <FIG>, the biasing device <NUM> is in a position that is rotated away from the cutting die <NUM> and the end portion of the pipe <NUM> to be threaded by the cutting die <NUM>. In the example shown, the pipe <NUM> may be secured in the support device <NUM> by the clamping device <NUM>, the adjusting device <NUM> and the latching device <NUM>, with the reaction arm <NUM> engaged with the retaining portion of the pipe threader <NUM>, as described above. Power may then be supplied to the motor <NUM>, and a force generated by the motor <NUM> may be transmitted to the cutting die <NUM>, to rotate the cutting die <NUM> about the axis of rotation A, as described above. With the cutting die <NUM> rotating, the operator may rotate the biasing device <NUM> about the first end of the biasing arm <NUM>, for example, in the direction C, as shown in <FIG>. Contact between the biasing plate <NUM> and the (rotating) cutting die <NUM> may be established by continued rotation of the biasing device <NUM> in the direction C. With the biasing plate <NUM> in contact with, or aligned with the cutting die <NUM> as shown in <FIG>, the operator may apply an axial biasing force B. Application of the axial biasing force in the direction B, through the positioning of the biasing plate <NUM> against the cutting die <NUM>, may cause the cutting die <NUM> to move axially, in the direction A1 along the pipe <NUM>, as the cutting die <NUM> rotates, and the cutting surfaces of the cutting die <NUM> are brought into contact with the outer circumferential surface of the pipe <NUM>, as shown in <FIG>.

As the cutting surfaces of the cutting die <NUM> engage the outer circumferential surface of the pipe <NUM>, and the cutting die <NUM> continues to rotate (for example, in the first direction R1 as described above with respect to <FIG>), the cutting surfaces may cut threads into the end portion of the pipe <NUM>. With the cutting die <NUM> and the pipe <NUM> engaged in this manner, the external axial force may no longer be required for the cutting die <NUM> to continue to move axially in the axial direction A1 and cut threads into the pipe <NUM>. When the threading operation is complete, an operation direction of the motor <NUM> may be changed, or reversed, causing the cutting die <NUM> to rotate in the second direction R2. Rotation of the cutting die <NUM> in the second direction R2 may cause the cutting die <NUM> to travel along the pipe <NUM> in the direction axial A2, back through the previously cut threads, so that the cutting die <NUM> and the pipe <NUM> may be disengaged.

In some implementations, the operational speed of the motor <NUM> (and the corresponding rotational speed of the cutting die <NUM>) in the second direction R2 may be greater than the operational speed of the motor <NUM> (and the corresponding rotational speed of the cutting die <NUM>) in the first direction R1. The reduced resistance between the cutting die <NUM> and the previously cut threads during rotation of the cutting die <NUM> in the second direction R2 may allow for relatively rapid disengagement of the cutting die <NUM> and the pipe <NUM> once the threading operation is complete, thus enhancing operator convenience and utility. In some implementations, the rotational speed may be set based on a detected operational direction of the motor <NUM>. In some implementations, the rotational speed may be set based on a detected operator manipulation of the motor control switch <NUM>.

As described above, in some implementations, the power control board <NUM> may include the motion sensing device 138A, including, for example, the gyroscope and/or the accelerometer that may selectively control operation of the motor <NUM> in a protection mode of operation. That is, in response to detection by the gyroscope and/or the accelerometer of the motion sensing device 138A of a displacement and/or a velocity and/or an acceleration of the pipe threader <NUM> that exceeds a corresponding preset threshold during operation, the power control board <NUM> may control the supply of power to the motor <NUM> to reduce, or suspend, operation of the motor <NUM>. In some implementations, in implementing the protection mode, the power control board <NUM> may reverse the operation direction of the motor <NUM>. The anti-kickback protection provided by operation in the protection mode may enhance safety both to the operator, and in the surrounding operational environment.

Claim 1:
A thread forming system (<NUM>), comprising:
a power tool (<NUM>), including:
a tool housing (<NUM>); and
a cutting head (<NUM>) configured to form threads in an elongated piece of stock (<NUM>), the cutting head (<NUM>) being configured to receive the piece of stock, (<NUM>) and to move axially along a longitudinal axis (A) of the piece of stock (<NUM>) to form the threads; and
a support device (<NUM>), including:
a clamping device (<NUM>) configured to secure a position of the piece of stock (<NUM>) relative to the power tool (<NUM>) for the cutting head (<NUM>) to form the threads;
a reaction arm device (<NUM>) including a reaction arm (<NUM>) coupled to the clamping device (<NUM>) and configured to abut a retaining portion of the power tool (<NUM>) to inhibit rotation of the housing (<NUM>) relative to the piece of stock while the cutting head (<NUM>) is forming threads; and
a biasing device (<NUM>) including a biasing arm (<NUM>) having a first end portion thereof moveably coupled to the clamping device (<NUM>), the biasing device (<NUM>) being configured to selectively engage the cutting head (<NUM>) so as to bias the cutting head (<NUM>) along the longitudinal axis (A);
characterised in that the clamping device (<NUM>) further comprises:
an upper support bracket (<NUM>) with a first clamping face (<NUM>) configured to engage the piece of stock (<NUM>); and
a lower support bracket (<NUM>) movably coupled to the upper support bracket (<NUM>), with a second clamping face (<NUM>) opposite the first clamping face (<NUM>) and configured to engage the piece of stock (<NUM>);
wherein the clamping device (<NUM>) further comprises a latching device (<NUM>) including an over center latch coupled between the lower support bracket (<NUM>) and the upper support bracket (<NUM>);
wherein the over center latch comprises:
a latch handle (<NUM>);
a first pivot pin (<NUM>) rotatably coupling the latch handle (<NUM>) to the upper support bracket (<NUM>);
a link (<NUM>);
a second pivot pin (<NUM>) rotatably coupling a first end of the link (<NUM>) to the latch handle (<NUM>); and
a third pivot pin (<NUM>) rotatably coupling a second end of the link (<NUM>) to the lower support bracket (<NUM>).