PIPE THREADING MECHANISMS AND SYSTEMS

Abstract

Power tool (110) comprising: a tool body (152); a tool head portion (111) extending from the tool body (152), the tool head portion (111) defining an axially accessible tool opening (114), the tool head portion (111) including a cylindrical wall (115) concentrically and rotatably mounted in the tool opening (114); at least one threading pawl (112) radially positionable to extend into the tool opening (114); at least one release pawl (116) radially positionable to extend into the tool opening (114); a drive ring (130) rotatably mounted on the tool head portion (111), the drive ring (130) engaging the at least one threading pawl (112) and the at least one release pawl (116) and rotatably positionable between (i) a first position in which the at least one threading pawl (112) extends into the tool opening (114), and (ii) a second position in which the at least one threading pawl (112) is retracted from extending into the tool opening (114) and the at least one release pawl (116) extends into the tool opening (114).

Description

AREA

[0001] The present subject matter relates to power tools, and in particular to handheld drives and mechanisms for using pipe threaders. The present subject matter is also applicable to threading operations performed with threading machines or similar devices. BACKGROUND

[0002] The current and typical use of a conventional power tool is as follows. For example, the tool transmits torque to a die head or similar device to rotate the device relative to a pipe or other member or a longitudinal axis. Although the threading die head is positively rotatable, it is not substantially retained axially, along a longitudinal axis, by or within the tool. Therefore, the die head may undesirably become axially disengaged from the tool during use, causing annoyance to the user.

[0003] In addition, the user often needs to apply axial force to the cutting head to allow the thread cutters to begin removing material from an area adjacent to a pipe or workpiece. If the force is insufficient, the dies will merely chamfer the end of the pipe rather than "bite" into the pipe surface to create a helical thread. For this reason, some users apply pressure to the tool to create an axial "starting force" that initiates such a "bite." In common practice, most users apply such axial force directly to the rotating cutting head.

[0004] While satisfactory in some respects, there is a need for a pipe threading device and associated system that addresses these operational concerns.

[0005] The document US 8 328 381 B1 relates to a power tool having an end effector rotatable with respect to the housing, a collar rotatable with respect to the housing, a printed circuit board (PCB) rotatably mounted with respect to the housing, and a light element operatively connected to the PCB and adjacent to the end effector, located in a recess of the collar and arranged to illuminate a workpiece machined by the power tool. SUMMARY

[0006] The difficulties and disadvantages associated with previous approaches to controlling pipe threading operations are addressed in the present subject as follows.

[0007] In one aspect, the present subject matter provides a power tool comprising a tool body and a tool head portion extending from the tool body. The tool head portion defines an axially accessible tool opening. The tool head portion includes a cylindrical wall concentrically and rotatably supported within the tool opening. The power tool further includes at least one threading pawl radially positionable to extend into the tool opening. The power tool further includes at least one release pawl radially positionable to extend into the tool opening. The power tool also includes a drive ring rotatably mounted on the tool head portion.The drive ring engages the at least one threading pawl and the at least one release pawl and is rotatably positionable between (i) a first position in which the at least one threading pawl extends into the tool opening and (ii) a second position in which the at least one threading pawl is retracted from extending into the tool opening and the at least one release pawl extends into the tool opening.

[0008] In another aspect, the present subject matter provides a power tool comprising a tool body and a tool head portion extending from the tool body. The tool head portion defines an axially accessible tool opening. The tool head portion includes a cylindrical wall concentrically aligned and rotatably supported within the tool opening. The tool also includes at least one light aligned to emit light toward the tool opening. The tool also includes at least one threading pawl radially positionable to extend into the tool opening and at least one release pawl radially positionable to extend into the tool opening.

[0009] As will be appreciated, the subject matter described herein is capable of other and different embodiments, and its several details are capable of modification in various respects without departing from the subject matter claimed. Accordingly, the drawings and description are to be considered as illustrative and not restrictive. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1A shows a conventional power tool. Fig. 1B shows a conventional cutting head. Fig. 2 shows an embodiment of a head portion of a power tool in accordance with the present subject matter. Fig. 2A is a cross-section of the Fig. 2, taken along line 2A-2A. Fig. 3 shows an outer surface of an embodiment of a drive ring and the Fig. 2 shown headboard. Fig. 3A is a cross-section of the Fig. 3 and the head part taken along the line 3A-3A. Fig. 4 shows an inner surface of the Fig. 3 shown drive ring. Fig. 4A is a cross-section of the Fig. 4, taken along line 4A-4A. Fig. 5A shows the drive ring from Fig. 3, which is installed on a head part of a power tool. Fig. 5B shows the inner surface of the drive ring made of Fig. 5A with various elements slidably arranged in slots of the drive ring. Fig. Figure 6A shows the drive ring and head of a power tool from Fig. 3 and a partial rotation of the drive ring. Fig. 6B shows the inner surface of the drive ring made of Fig. 6A with various elements slidably arranged in the slots of the drive ring. Fig. Figure 7A shows the drive ring and head of a power tool from Fig. 3 and the complete rotation of the drive ring. Fig. 7B shows the inner surface of the drive ring made of Fig. 7A with various elements slidably arranged in the slots of the drive ring. Fig. 8 shows a portion of an embodiment of a power tool having at least one light according to the present subject matter. Fig. 9 shows the cutting head of Fig. 1B with a variety of openings. The Fig. 10A and Fig. 10B show a portion of another embodiment of a power tool having at least one light according to the present subject matter. Fig. Figure 11 is a schematic view of a gear assembly in a conventional power tool. Fig. 12 is a schematic illustration of a gear assembly in a power tool according to the present subject matter. Fig. 13 is a view of a motor, a gear box and a ring gear of Fig. 12, taken from the line XIII-XIII in Fig. 12. Fig. 14 is a schematic view of another embodiment of a power tool having at least one light according to the present subject matter. Fig. 15 is a schematic illustration of another embodiment of a power tool having at least one light according to the present subject matter. Fig. 16 is a cross-sectional view of a head portion of a power tool according to the present subject matter. Fig. 17 is an exploded view of a head portion of a power tool according to the present subject matter. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0010] The present subject matter prevents the inadvertent separation of a cutting head from a power tool. The present subject matter provides assemblies for actively engaging and / or disengaging a cutting head from a power tool.

[0011] The present subject matter also provides one or more lights on a power tool to illuminate a workpiece for ease of use. Current threading practices require the user to visually determine when the thread is complete, so visibility in this area is critical. Furthermore, many applications use handheld power tools for maintenance or for threading previously installed pipe. In these cases, and in typical new construction areas, task lighting is limited. Providing a light on the tool therefore provides more uniform illumination of the workpiece. Due to the rotation of the cutting head during use, illuminating the pipe presents unique challenges compared to other tools.

[0012] Furthermore, the present subject matter allows the user to start a thread or begin threading by pressing on the tool rather than the cutting head. The present subject matter also provides a defined or dedicated area on a power tool that the user can press to initiate a threading operation. This eliminates the need for an additional projection or element attached or mounted to the tool to press for thread cutting or engagement.

[0013] The present subject matter also provides a tool assembly that results in a shorter overall length and higher mechanical efficiency and utilizes more readily available gear technology to transmit a desired torque from the tool motor to the tool output gear.

[0014] Although various references are made herein to pipe threading and pipe thread cutting, the present subject matter is not limited to forming or machining threads in pipes. Instead, the present subject matter may be applicable to forming or machining threads in a wide variety of workpieces besides pipes. Although the present subject matter is described with respect to die heads for threading operations, the present subject matter may also be used in conjunction with other tools and components.

[0015] In one embodiment, the present subject matter provides an assembly for actively engaging or disengaging threading pawls of a power tool into contact with a cutting head, particularly a RIDGID 12-R cutting head available from Ridge Tool Company. It should be understood that while reference is made herein to various products available from Ridge Tool Company, the present subject matter is not limited to these products and is instead applicable to a wide variety of other products and goods, including those available from other suppliers and manufacturers.

[0016] In today's market, power tools have at least one, and usually even two, threading pawls that extend radially inward from a head portion of the tool. Fig. 1A, these threading pawls are shown as threading pawls 12 in a representative RIDGID 700 brand power tool 10 from Ridge Tool. The threading pawls 12 extend radially inward from a head portion 11 of the power tool 10. More specifically, the threading pawls 12 extend radially from a pivoted cylindrical wall 15. Upon powering and actuating the tool 10, the wall 15 and threading pawls 12 assembly rotates. The threading pawls 12 are spring-loaded and engage slots 22 in a removable and separable cutting head 20, as shown in Fig. 1B.

[0017] Since the pawls 12 are radially spring-loaded, the cutting head 20 can be inserted into a tool opening or a receiving area 14 of the tool 10. This insertion pushes the threading pawls 12 radially outward, allowing the cutting head 20 to be fully inserted into the tool 10. When installed, the threading pawls 12 engage the threading pawl slots 22 of the cutting head 20, thereby securely holding the cutting head 20 in the tool 10.

[0018] In accordance with the present subject matter, a power tool, and in particular a tool head portion of a power tool, comprises one or more threading pawls extending radially inward from the tool opening. Furthermore, the power tool, in particular a tool head portion, comprises one or more release pawls also extending radially inward from the tool opening. In many embodiments, the power tool, in particular a tool head portion, further comprises a biasing spring also seated in a capture region. These aspects are described in the Fig. 2 and Fig. 2A. In particular, the Fig. 2 and Fig. 2A illustrates an embodiment of a head portion 111 of a power tool 110. The head portion 111 defines a tool opening or receiving area 114 configured, i.e., sized and shaped, to receive a cutting head as described herein. The power driver 110 includes one or more threading pawls 112 that may extend radially inward from the head portion 111 and from a rotatably mounted cylindrical wall 115. The power driver 110 also includes one or more release pawls 116 that may extend radially inward from the head portion 111. The pawls 112 and 116 may also be retracted or retracted radially outward into the head portion, as described herein. In certain versions, the power driver 110 also includes a biasing spring 118 disposed within a capture area 119 defined in the head portion 111. These aspects are described in more detail herein.

[0019] In many versions, a drive ring is used in conjunction with the tool head, as in the Fig. 3 and Fig. 3A. In particular, the Fig. 3 and Fig. 3A an outer surface 132 of an embodiment of a drive ring 130. The drive ring 130 is shown as it is mounted on the tool head portion 111 of the Fig. 2. More specifically, the drive ring 130 is rotatably mounted on the tool head portion 111. The drive ring 130 is rotatably positionable between a first and a second position. The drive ring 130 is engaged with the threading pawls 112 and the release pawl 116 (in Fig. 2) such that when the drive ring is positioned in the first position, the threading pawls 112 extend into the tool opening 114 and the release pawl 116 is retracted from the tool opening 114. When the drive ring 130 is moved to the second position, the threading pawls 112 no longer extend into the tool opening 114 and the release pawl 112 extends into the tool opening 114. These positions and the arrangement of the components are described in more detail herein.

[0020] The Fig. 4 and Fig. 4A show an inner surface 134 of the drive ring 130, which, when assembled with the tool head part 111, is directed towards the biasing spring 118, the threading pawls 112 and the release pawl 116. As can be seen, the outer surface 132 (in Fig. 3) and the inner surface 134 of the drive ring 130 are oppositely oriented. As shown in the Fig. 4 and Fig. 4A, the drive ring 130 includes features that engage the biasing spring 118, the threading pawls 112, and the release pawl 116. In particular, the drive ring 130 includes threading pawl slots 136, a biasing spring tab 138, and a release pawl slot 140 along the inner surface 134. The release pawl slot 140 includes a release pawl extension and a locking portion 142. Upon assembly of the drive ring 130 with the tool head portion 111, the biasing spring tab 138 engages a Fig. 2, which is attached to or otherwise connected to the biasing spring 118. And, during said assembly, portions or elements of the pawls 112 and 116 are engaged with, and in certain embodiments, slidably received in, the slots 136 and 140, respectively. These aspects are described in more detail herein.

[0021] When a user rotates the drive ring 130, the threading pawl slots 136 actively move the threading pawls 112 of the tool 110 radially outward (or inward) via a cam profile of the slots 136. The cam profile of the slots 136 is described in more detail herein. In this way, the tool opening 114 is cleared of all threading pawls when the drive ring 130 is fully rotated. In addition, as the drive ring 130 is rotated, the bias spring 118 is compressed. Finally, the release pawl 116 can extend into the tool opening 114 when the drive ring 130 is fully rotated. Due to the shape of the release pawl extension and the detent portion 142 of the release pawl slot 140, the release pawl 116 then prevents the drive ring 130 from returning to its original position despite the active biasing spring force in contact with the biasing spring tab 138 of the drive ring 130.

[0022] The term “cam profile” of the threading pawl slots 136 refers to a configuration or orientation of the slots relative to a center 131 of the drive ring 130 (see Fig. 4). Specifically, each slot 136 defines an inner end 136A, an outer end 136B, and slot walls 136C and 136D extending between the ends 136A and 136B. The inner end 136A is closer to the center 131 than the outer end 136B. The term "cam profile" refers to the geometric and typically arcuate profile of the slot walls 136C and 136D. It should be understood that when the drive ring 130 is assembled with the tool head portion 111, the radial positions of the threading pawls 112 are determined by the cam profile of the slots 136.Although the present subject matter encompasses a wide variety of assemblies and component configurations, in the described embodiment, each threading pawl 112 includes a projection or member 112A, described in more detail herein, that movably engages, is slidably disposed within, or is otherwise in contact with, or is guided by, the threading pawl slots 136. Similarly, the release pawl 116 includes a projection or member 116A, also described in more detail herein, that engages, is slidably disposed within, or is otherwise in contact with, or is guided by the release pawl slot 140. The biasing spring 118 urges the drive ring 130 to the previously described first position shown in FIGS. Fig. 5A and Fig. 5B is shown.

[0023] Referring to Fig. 5A, the tool opening 114 appears in a normal operating position of the tool 110, ie, in the specified first position of the drive ring 130, as shown. Here, only the threading pawls 112 protrude into the tool opening 114. The release pawl 116 therefore does not protrude into the tool opening 114. In Fig. 5B also shows the position of the threading pawls 112 and the release pawl 116 in their respective slots of the drive ring 130 in the indicated first position of the drive ring. Fig. 5A shows the drive ring 130 installed on the head portion 111 of the power tool 110. And Fig. Figure 5B shows the inner surface 134 of the drive ring 130 in this installed state. In this normal operating position of the tool 110, the threading pawls 112 extend radially into the tool opening or receiving area 114. In this operating position, the release pawl 116 (in Fig. 5A not shown) and does not protrude into the tool opening or the receiving area 114. In Fig. 5B, the inner surface 134 of the drive ring 130 and the positions of the threading pawls 112A and the release pawl 116A in their respective slots 136 and 140 are shown. As previously mentioned, each threading pawl 112 includes a member 112A that is slidably received in the slots 136. And the release pawl 116 includes a member 116A that is slidably received in the slot 140 of the release pawl.

[0024] Referring to Fig. 6A, counterclockwise rotation of the drive ring 130 (as viewed toward the tool 110) retracts the threading pawls 112 radially outward from the tool opening 114 via the threading pawl slots 136. The release pawl 116 remains retracted relative to the tool opening 114. Fig. Figure 6B shows the inner surface 134 of the drive ring 130 in the installed state. By rotating the drive ring, as shown in the Fig. 6A and Fig. 6B, the threading pawls 112 continue to be moved radially outwardly outside the tool opening 114 due to the shape, i.e., the cam profile, of the threading pawl slots 136 of the drive ring 130.

[0025] With reference to the Fig. 7A and Fig. 7B, a further biasing spring described herein urges the release pawl 116 to extend radially inward into the tool opening 114 via the release pawl extension and the detent portion 142 of the release pawl slot 140 of the drive ring 130 when the drive ring 130 is fully rotated against the rotational bias caused by the biasing spring 118 and its engagement with the tab 138 of the drive ring 130. In this state, i.e., in the indicated second position of the drive ring, the tool 110 is ready to accept a cutting head such as that shown in Fig. 1B. When the user inserts the cutting head 20, such as a Model 12-R cutting head available from Ridge Tool, into the tool opening 114, the cutting head 20 contacts the release pawl 116. As the user inserts the cutting head 20 further axially into the tool opening 114, the release pawl 116 is forced radially outward. This allows the release pawl member 116A to clear the release pawl extension and the detent portion 142 of the release pawl slot 140 of the drive ring 130. When this occurs, nothing prevents the biasing spring 118 (in Fig. 2) to return the entire drive ring 130 to the normal operating position, i.e., the aforementioned first position. In doing so, the threading pawls 112 extend radially inward and come into contact with the inserted cutting head 20. The mechanism cycle is completed, and the tool 110 can be used to transmit torque to the cutting head 20 to complete the desired work.

[0026] In many embodiments, a distal end of the release pawl is angled to allow or promote sliding along the axis of the release pawl when contact is made with the cutting head. It is understood that the distal end or distal surface of the release pawl may be shaped differently without consequence. It is important that the release pawl be displaced linearly along its axis during assembly of the cutting head. Fig. 7A, an angled distal end 116B of the release latch 116 is shown.

[0027] In the embodiments described herein, all pawls, i.e., the threading pawls 112 and the release pawl 116, are optionally equipped with light conical springs that compress them radially inward. These springs compensate for minor changes in the configuration or position of the drive ring during use. It is understood that other spring types, sizes, or forces may be used. In some embodiments, no springs are actively in contact with the pawls.

[0028] While the direction of rotation for opening or unlocking the cutting head portion of the tool is counterclockwise in the embodiment described herein, it is understood that alternative embodiments may exist that utilize a different direction of rotation. This is not relevant to the present subject matter.

[0029] Although the die head retainer is well-known in the marketplace, there are no known one-handed 11-R installation systems for RIDGID Model 11-R die heads available from Ridge Tool. In other words, there are no existing systems for Model 11-R die heads that lock in the "open" or "unlocked" position. A similar configuration described here for Model 12-R die heads can also be used for 11-R die heads.

[0030] In another embodiment, at least one light is provided on the tool to illuminate the cutting head and the pipe or other workpiece during use for enhanced visibility. In one embodiment, the tool includes one or more lights, e.g., LEDs, mounted on the tool body and directed toward the tool opening. These aspects are described in Fig. 8. In particular, a power tool 110 is shown. The power tool 110 includes a head portion 111. The power tool 110 also includes one or more lights 150. The lights 150 are attached to or otherwise provided on the body of the tool, designated 152. The lights 150 are generally directed toward a rotational axis of the head portion 111, which in Fig. 8 is shown as axis A. By placing the luminaires in this area, the luminaires are protected and illuminate a pipe or other workpiece radially for optimal visibility.

[0031] Most commercially available cutting heads on the market have a considerable amount of structural material with a multitude of openings, in most cases four (4). Fig. 9 is in particular the previously described cutting head 20 from Fig. 1B. Fig. 9 shows a plurality of openings 24 arranged at equal distances around the circumference of the cutting head 20.

[0032] Since most commercially available cutting heads have only limited openings through which the radially directed light can pass during use, it can be advantageous to have more than one light, as in Fig. 8. However, it goes without saying that for many applications, one light is sufficient. However, a single light can lead to a stroboscopic effect because the openings rotate around the tube, alternately blocking and transmitting light. More than one light has the advantage of balancing the amount of light that is blocked or transmitted. In other words, the lights can be positioned so that the light from at least one of the lights always or substantially passes through the cutting head opening onto the workpiece, regardless of the rotational position of the cutting head. In this case, the stroboscopic effect can be minimized or eliminated.

[0033] In another embodiment, the present subject matter provides a ring or partial ring of lights mounted coaxially with the cutting head. Here, a minimum of two lights may be used, with many applications using a larger number of lights, e.g., four lights. In certain applications, at least eight lights are used. These aspects are described in the Fig. 10A and Fig. 10B. Fig. 10A shows a power tool 110 and its head portion 111 extending from the tool body 152. A cutting head 20 is engaged with the head portion 111. The power tool 110 includes one or more lights 160 disposed around the head portion 111, and in particular around the tool opening or receiving area 114 of the tool 110, and oriented to emit light toward the cutting head 20. The light(s) 160 may be arranged in an annular, circular, or arcuate configuration. Fig. 10B shows the cutting head 20 and the light(s) 160 arranged in the head part 111.

[0034] A plurality of lights arranged in a ring around a tool opening or receiving area 114 of the tool 110 provides improved illumination from all user angles and allows for a better view of the pipe as the pipe moves axially into the dies and cutting head.

[0035] It is to be understood that this embodiment has a complete illumination ring as shown in the Fig. 10A and Fig. 10B. However, one or more partial rings may be used and positioned at one or more optimal locations for user visibility. In other words, it is not absolutely necessary for the illumination ring to extend below the cutting head.

[0036] Other methods and arrangements for illuminating the tubular workpiece are also part of the present subject matter. In one embodiment, one or more illuminations are mounted on a component extending from the tool parallel to the tube axis or at an angle of less than 90° to the tube axis. In some embodiments, this component is pivotable and, when not needed, can be rotated into a storage position against the tool body and then pivoted outward, as in Fig. 14 to illuminate the tube. In other embodiments, this component is shown in Fig. 14 shown position. In Fig. 14, a lighting component 170 is shown supported by a light rod 180. The light rod 180 is attached or otherwise secured to a power tool 110. As previously mentioned, the light rod 180 may be rigidly attached to the tool 110. Or, in other embodiments, the light rod 180 may also be selectively positionable relative to the tool 110. In the embodiment shown in Fig. In the arrangement shown in Figure 14, the light rod 180 extends with a longitudinal axis Q parallel or substantially parallel to the axis P of a tube or workpiece which engages a tool head part 111 of the tool 110.

[0037] Another alternative embodiment for the illumination of the tube includes a flexible element that can be repositioned by the user to optimally illuminate the tube during use. This is shown in Fig. 15. In Fig. 15, the illumination component 170 is particularly illustrated, which is supported by a flexible rod 180A. In this alternative embodiment, the illumination component 170 can be oriented at virtually any angle relative to the axis P of a pipe or workpiece and / or the tool head 111.

[0038] In this embodiment, the user can modify or selectively position the flexible element to illuminate any preferred part of the workpiece. The element is rigid enough to maintain its position when released. Because the element is flexible, it can be moved to a storage location when not needed and is less susceptible to damage during handling and transportation.

[0039] In another embodiment, a unique mechanical design or assembly for tools is provided that revisits a conventional gear arrangement. In existing handheld power drives, the motor is mounted longitudinally or in line with the main axis of the tool. This orientation is lateral or perpendicular to the axis of the pipe workpiece. In order for the tool to rotate the cutting head portion and perform the work, the rotation axis must be rotated 90°. In certain handheld power drives, this is accomplished by using a spur gear in the final gear stage. This is Fig. 11 shown.

[0040] In Fig. 11, a conventional power tool 210 is schematically illustrated. The tool 210 includes a head portion 211 providing a receiving area 214 with a rotary engagement arrangement to which a component, such as a cutting head, can be attached and rotated about the X axis. The head portion 211 generally extends from a tool body 220 having a longitudinal Y axis. The tool 210 also includes a motor 230 providing a driven rotary output 232. The rotational axis of the driven rotary output 232 is typically coextensive with or parallel to the longitudinal Y axis. A gearbox 240 transmits the rotational power from the output 232 to a spur gear 250 on the head portion 211. The tool may also include a casing or housing. It should be understood that in this conventional arrangement, the X axis is oriented 90° relative to the Y axis.

[0041] In other hand-held thread cutters, this 90° rotation of the rotation axis is achieved by a bevel gear, a worm gear or a similar arrangement.

[0042] According to another aspect of the present subject matter, the motor is oriented laterally to the tool body and parallel to the axis of the tubular workpiece. An embodiment is shown in Fig. 12 and Fig. 13. This allows simpler gear shapes, such as spur or helical gears, to be used throughout the gear train, which can lead to lower costs. Likewise, it can lead to higher overall mechanical efficiency of the gear, which in turn means the tool performs more work with a given amount of energy.

[0043] In Fig. 12, an embodiment of a power tool 310 according to the present subject matter is schematically illustrated. The tool 310 generally defines a longitudinal tool axis Y. The tool 310 includes a head portion 311 extending from a tool body 320. The head portion 311 provides a receiving area 314 with a rotational engagement arrangement to which an element, such as a cutting head, can be attached and rotated about the axis X. Typically, the tool head portion 311 also includes a cylindrical wall 315 rotatably mounted within the tool opening. The tool 310 also includes a motor 330 providing driven rotational power 332. A gearbox 340 transmits the rotational power from the output 332 to a gear, such as a ring gear 350, in the head portion 311. The gear, such as a ring gear 350, is rotatably mounted within the tool opening. B. the ring gear 350, is rotatably mounted in the head part 311. The tool 310 may also include a casing or housing which Fig. 12 is generally shown as a dashed line, which forms the tool body 320 and the head part 311. In the embodiment of Fig. 12, the axis of the motor 330, i.e. the axis of the rotating output 332, shown as axis W, is parallel to the axis of rotation on the cutting head, shown as axis X. In many embodiments, the axis of the motor 330 and its output 332, i.e. in many embodiments the axis of the motor 330 and its output 332, i.e. axis W, is transverse or perpendicular to the longitudinal axis of the tool, i.e. axis Y. Of course, rotation of the ring gear 350 results in rotation of the cylindrical wall 315 and the components (not shown) engaging therewith, such as the cutting head (not shown).

[0044] According to Fig. 12, the gearbox 340 generally includes a rotatable shaft 370 upon which a gear 360 and another gear 380 are mounted. The gearbox 340 also includes another rotatable shaft 372 having a gear 362 and a gear 382 mounted thereon. The gearbox 340 also includes another rotatable shaft 374 upon which a gear 384 and another gear 364 are mounted. The rotational power of the motor 330 is transmitted to the shaft 374 via a motor shaft gear 333 mounted on the rotating output or shaft 332 of the motor 330. The power transmission from shaft 332 to shaft 374 occurs through the meshing of gears 333 and 364. The rotational power transmission from shaft 374 to shaft 372 occurs through the meshing of gears 384 and 362. The rotational power transmission from shaft 372 to shaft 370 occurs through the meshing of gears 382 and 360.The rotational force is transmitted from the shaft 370 to the ring gear 350 by the meshing of the gears 380 and 350.

[0045] Fig. 13 is a schematic view of the motor 330, the gearbox 340 and the ring gear 350 of Fig. 12, taken from the line XIII-XIII in Fig. 12. Fig. Figure 13 also shows a parallel alignment of the axis W of the motor 330 and its rotating output 332 with the axis X of the ring gear 350. In Fig. 13 also illustrates an inline alignment of at least one, particularly two, and particularly three, shaft and gear assemblies of the transmission 340. This feature is characterized in that at least one, particularly two, and particularly three, of the centers of the shaft and gear assemblies, designated 340A, 340B, and 340C, are aligned with the X and W axes and, in a particular embodiment, are aligned and coincident with the longitudinal Y axis of the tool 310.

[0046] In the Fig. 16 and Fig. 17, further aspects of the head portion 111 of the power tool 110 according to the present subject matter are illustrated. Fig. 16 is a partial cross-section of the head part 111. Fig. Figure 17 is an exploded assembly view of the head portion 111. The head portion 111 defines a receiving portion 420 defined by an inner cylindrical wall 422 and a ledge 424. The receiving portion 420 is sized and shaped to receive a rotatable base 400. The receiving portion 420 includes an access opening 410 that exposes a gear member 425 driven by a drive train (not shown) of the tool 110. As will be understood, upon insertion of the base 400 into the receiving portion 420, the gear member 425 engages a gear surface 405 defined along a surface 404 of the base 400. The base 400 defines the aforementioned cylindrical wall 115. The base 400 also defines one or more openings 112D sized and shaped to allow the threading pawls 112 to extend therethrough.The base 400 also defines one or more openings 116D sized and shaped to allow the release pawl 116 to extend therethrough. Each threading pawl 112 typically includes a biasing member, which may be in the form of a spring 112C. Each release pawl 116 typically includes a biasing member, which may be in the form of a spring 116C. The springs 112C are sized and shaped to receive the projection 112A of the threading pawl 112. The spring(s) 116C are sized and shaped to receive the projection 116A of the release pawl 116. The drive ring 130 is disposed on the rotatable base 400 such that the base 400 is generally disposed between the drive ring 130 and the tool head portion 111. The surface 132 of the drive ring is directed in a direction opposite to the surface 404 of the base 400.The drive ring 130 is held in the head portion 111 by an outer retaining ring 430 and an inner retaining ring 432. A bearing element 434 supports the rotation of the base 400 within the receiving area 420 of the tool head portion 111.

[0047] In many applications, a user desires to apply an axial force to a power tool, and in particular to a tool head portion of such a tool. The present subject matter includes two representative embodiments that facilitate the application of such forces by a user.

[0048] In one embodiment, an area or region within the head profile of the tool is designated for the application of force to axially initiate the threading process. This embodiment eliminates the need for the user to apply pressure to the rotating cutting head and can be used in combination with the locking cutting head embodiment described herein. This embodiment has the added advantage of not requiring additional clearance around the head of the tool. Thus, there is no compromise for the user to have this feature by trading accessibility for use.

[0049] In another embodiment, an outwardly projecting member is provided on the tool head portion to absorb the axial force or forces, if applied. In particular, with reference to Fig. 5A, Fig. 6A, Fig. 7A, Fig. 8, Fig. 10A and Fig. 12, an outwardly projecting member, such as a shoulder 400, extends from a distalmost portion of the power tool 110, and in particular, the tool head portion 111. The shoulder 400 provides oppositely directed surface areas 402 and 404 that present areas or locations for a user to conveniently apply force to the tool 110. In many embodiments, the shoulder 400 is integrally formed with or permanently attached to the tool head portion 111.

[0050] The advantages of the cutting head locking and unlocking system include the following.

[0051] The system for locking and unlocking the cutting head, i.e. the active engagement and disengagement system, prevents unwanted, disruptive axial separation of the cutting head from a power-driven tool.

[0052] The cutting head locking and unlocking system allows the user to initiate threading by axial force applied to a power-driven tool rather than a rotating cutting head.

[0053] The cutting head locking and unlocking system provides or enables easier separation of the cutting head from a power tool when the cutting head needs to be removed. This is because the threading pawls do not interfere with the removal of the cutting head.

[0054] The cutting head locking and unlocking system provides easier, one-handed insertion of the cutting head into a power tool or allows this when the system is held in the "open" position.

[0055] The cutting head locking and unlocking system provides or enables automatic locking of the cutting head once installed. This reduces installation time and prevents accidental locking.

[0056] The area on a power-driven tool that must be pressed to start a thread reduces the required clearance around the tool compared to other variants characterized by a projection beyond the tool head. This allows the tool to be used in tighter spaces.

[0057] A light on a power tool to illuminate the cutting head during use provides the benefits of more uniform illumination when workplace lighting may be minimal and better visibility for the user to determine when the thread is complete.

[0058] Motor position / orientation reduces the overall length of the tool, increases operating efficiency, and can result in lower manufacturing costs.

[0059] Variations of the cutting head locking and unlocking mechanism to accommodate 11-R cutting heads are conceivable. However, the same premise applies: A release latch would lock the drive ring in the "open" or "unlocked" position. Then, upon inserting the cutting head, the release latch would be moved, causing the system's threading latches to re-engage the cutting head.

[0060] Many more benefits will undoubtedly become apparent through the future application and development of this technology.

[0061] All patents, applications, standards and articles mentioned herein are hereby incorporated by reference in their entirety.

[0062] The present subject matter encompasses all operable combinations of the features and aspects described herein. Thus, for example, if one feature is described in connection with one embodiment and another feature is described in connection with another embodiment, the present subject matter is understood to include embodiments having a combination of those features.

[0063] As described above, the present subject matter solves many problems associated with prior strategies, systems, and / or devices. However, it is recognized that various changes in the details, materials, and arrangements of components described and illustrated herein to explain the nature of the present subject matter may be made by those skilled in the art without departing from the principle and scope of the claimed subject matter as expressed in the appended claims.

Claims

[1] Power tool (110) comprising: a tool body (152); a tool head portion (111) extending from the tool body (152), the tool head portion (111) defining an axially accessible tool opening (114), the tool head portion (111) including a cylindrical wall (115) concentrically and rotatably mounted in the tool opening (114); at least one threading pawl (112) radially positionable to extend into the tool opening (114); at least one release pawl (116) radially positionable to extend into the tool opening (114); a drive ring (130) rotatably mounted on the tool head portion (111), the drive ring (130) engaging the at least one threading pawl (112) and the at least one release pawl (116) and rotatably positionable between (i) a first position in which the at least one threading pawl (112) extends into the tool opening (114), and (ii) a second position in which the at least one threading pawl (112) is retracted from extending into the tool opening (114) and the at least one release pawl (116) extends into the tool opening (114). [2] The power tool (110) of claim 1, wherein the at least one release pawl (116) defines an angled distal end (116B). [3] A power tool (110) according to any one of the preceding claims, wherein upon positioning the drive ring (130) in the first position, the at least one release pawl (116) is retracted from extending into the tool opening (114). [4] A power tool (110) according to any one of the preceding claims, further comprising: a bias spring (118) mounted in the tool head portion (111) and configured to urge the drive ring (130) into the first position. [5] A power tool (110) according to any one of the preceding claims, wherein the power tool (110) comprises two threading pawls (112) radially positionable to extend into the tool opening (114). [6] The power tool (110) of any preceding claim, wherein the drive ring (130) includes at least one threading pawl slot (136), the at least one threading pawl (112) including a threading pawl member (112A) slidably received in the at least one threading pawl slot (136). [7] The power tool (110) of any preceding claim, wherein the drive ring (130) includes at least one release pawl slot (140), the at least one release pawl (116) including a release pawl member (116A) slidably received in the at least one release pawl slot (140), the at least one release pawl slot (140) including a release pawl extension and a locking portion (142). [8] A power tool (110) according to any one of the preceding claims, further comprising: at least one light (160) oriented to emit light in the direction of the tool opening (114). [9] The power tool (110) of claim 8, wherein the at least one light (160) is provided on the tool head portion (111). [10] A power tool (110) according to any one of claims 8 or 9, wherein the at least one light (160) is arranged at least partially around the tool opening (114). [11] The power tool (110) of any one of claims 8 to 10, wherein the at least one light (160) is provided on the tool body (152). [12] A power tool (110) according to any one of the preceding claims, further comprising: a shoulder (400) extending from a distalmost region of the tool head portion (111), the shoulder (400) providing an area (402, 404) for a user to apply force. [13] Power tool (110) comprising: a tool body (152); a tool head portion (111) extending from the tool body (152), the tool head portion (111) defining an axially accessible tool opening (114), the tool head portion (111) including a cylindrical wall (115) concentrically and rotatably mounted in the tool opening (114); at least one light (160) which is aligned to emit light in the direction of the tool opening (114) at least one threading pawl (112) radially positionable to extend into the tool opening (114); at least one release pawl (116) radially positionable to extend into the tool opening (114). [14] The power tool (110) of claim 13, wherein the at least one light (160) is provided on the tool head portion (111). [15] A power tool (110) according to any one of claims 13 or 14, wherein the at least one light (160) is arranged at least partially around the tool opening (114). [16] The power tool (110) of any one of claims 13 to 15, wherein the at least one light (160) is provided on the tool body (152). [17] The power tool (110) of any one of claims 13 to 16, wherein the at least one release pawl (116) defines an angled distal end (116B). [18] A power tool (110) according to any one of claims 13 to 17, further comprising: a drive ring (130) engaged with the at least one threading pawl (112) and the at least one release pawl (116) and rotatably positionable between (i) a first position in which the at least one threading pawl (112) extends into the tool opening (114) and (ii) a second position in which the at least one threading pawl (112) is retracted from extending into the tool opening (114) and the at least one release pawl (116) extends into the tool opening (114). [19] The power tool (110) of claim 18, wherein upon positioning the drive ring (130) to the first position, the at least one release pawl (116) is retracted from extending into the tool opening (114). [20] A power tool (110) according to claim 18 or 19, further comprising: a bias spring (118) configured to urge the drive ring (130) into the first position. [21] The power tool (110) of any one of claims 18 to 20, wherein the drive ring (130) includes at least one threading pawl slot (136), the at least one threading pawl (112) including a threading pawl member (112A) slidably received in the at least one threading pawl slot (136). [22] The power tool (110) of any one of claims 18 to 21, wherein the drive ring (130) includes at least one release pawl slot (140), the at least one release pawl (116) including a release pawl member (116A) slidably received in the at least one release pawl slot (140). [23] The power tool (110) of claim 22, wherein the at least one release pawl slot (140) includes a release pawl extension and a locking portion (142).

Images