Tube cutting tools and accessories therefor

Abstract

The present invention relates to a tube cutting tool and accessories for such a tube cutting tool. A power tool such as a cutting saw having a rotating powered blade is described. Various accessories for the tool for use with cylindrical workpieces such as tubes are also described. The accessories include: a clamp and saw coupling assembly, various quick connect assemblies between the saw and the clamping system, a reach-in guide assembly, a latch plate assembly, an interlock switch, a blade guard system, and a chip management system or chip deflector. Related methods of use are also described.

Description

[0001] This application is a divisional application, and its original application is a Chinese patent application with application number 201911032231.X and application date October 28, 2019, and the name of the invention is “Tube manufacturing tools, blade protection system and clamping system”. Technical Field

[0002] The present subject matter relates to steel tube manufacturing, but can be extended to the manufacturing or processing of other tubular materials. In addition, the present subject matter also relates to systems where rapid separation and removal between component parts of the system is advantageous, or where movement around a cylindrical object is required. Background Art

[0003] There is a need for a very efficient, accurate and easier means of attaching a chop saw to a clamping assembly for cylindrical tube or workpiece manufacturing. To optimize a chop saw system for "ground cutting" and "cutting in place", separating the clamp and chop saw components would be advantageous in reducing the mass required for the user to attach it to the tube. This is particularly important when cutting in place where locations of the tube or workpiece may be difficult to reach and smaller parts are much simpler to operate.

[0004] Additionally, there is a need for the ability to accurately cut steel pipe of various sizes on the job site. Common methods such as plasma cutting or torch cutting require a significant amount of setup time and result in the cut surface requiring additional operations (e.g., grinding). Improved cutting accuracy allows secondary manufacturing operations (such as beveling) to be performed immediately after cutting, eliminating the need to finish the cut ends before performing those operations on the workpiece.

[0005] Additionally, there is a need for a cleaning method for controlling metal debris generated during the cutting process to simplify cleanup and reduce the effects of ejected chips dispersed from the blade during the cutting process.

[0006] Therefore, a need exists for assemblies and / or strategies that facilitate operator convenience when performing operations on cylindrical workpieces, such as tubes. Summary of the invention

[0007] The difficulties and drawbacks associated with previous approaches are addressed in the present subject matter as follows.

[0008] In one aspect, the subject matter provides a powered cutting tool comprising a motor, a rotating cutting blade driven by the motor, and a control device for selectively adjusting the operation of the motor. The saw further comprises at least one feature selected from the group consisting of: (i) an alignment plate for use in an entry guide assembly, (ii) a latch plate assembly for use in a quick connect assembly, (iii) an interlock system; (iv) a blade guard system; (v) a chip management system; and (vi): a combination of (i)-(v).

[0009] In another aspect, the present subject matter provides a quick release assembly for attaching a tube manufacturing tool to a clamping system. The clamping system includes a pair of pivotally movable arms and a slidable center carriage. The quick release assembly includes a quick-connect pin extending outwardly from the clamping system. The pin defines a tip, a base, and a circumferential groove extending around the periphery of the pin.

[0010] In yet another aspect, the present subject matter provides an insertion guide assembly for use with a tube manufacturing tool having a rotating blade and a clamping system. The insertion guide assembly includes an alignment plate attached to the tube manufacturing tool, and a slotted guide attached to the clamping system. One of the slotted guide and the alignment plate includes an axially positionable pin, and the other of the slotted guide and the alignment plate includes a cylindrical hole. Once the tube manufacturing tool is attached to the clamping system, the alignment plate is engaged with the slotted guide by axially positioning the pin in the cylindrical hole.

[0011] In yet another aspect, the subject matter provides a latch plate assembly for use with a tube manufacturing tool having a rotating blade and a receiving hole and a clamping system having a quick connect pin extending outwardly from the clamping system. The pin defines a circumferential groove extending around the periphery of the pin. The latch plate assembly includes a positionable latch plate disposed on the tube manufacturing tool. The latch plate defines a concave cutout. Once the quick connect pin is inserted into the receiving hole, the concave cutout of the latch plate engages with the quick connect pin.

[0012] In yet another aspect, the subject matter provides an interlock system for use with a tube manufacturing tool having a rotating blade and defining a receiving hole and a clamping system having a quick connect pin. The interlock system includes an electrical switch. Once the quick connect pin is inserted into the receiving hole, the electrical switch is closed, thereby allowing operation of the tube manufacturing tool.

[0013] In another aspect, the present subject matter provides a chip management system for use with a tube manufacturing tool having a rotating blade. The chip management system includes a blade guard positioned adjacent to a rotating blade of the tube manufacturing tool. The blade guard includes an outlet and at least one diverging wall extending toward the outlet. The chip management system also includes at least one main channel defined in the tube manufacturing tool, the main channel extending between the outlet of the blade guard and an area in the tube manufacturing tool to expel chips generated during operation of the blade.

[0014] In another aspect, the present subject matter provides a blade guard system for use with a pipe manufacturing tool having a rotating blade. The blade guard system includes a front blade guard positionable about a rotational axis of the blade, and a rear blade guard also positionable about the rotational axis of the blade.

[0015] As will be realized, the subject matter described herein is capable of other and different embodiments, and its several details are capable of modifications in various respects, all without departing from the subject matter claimed.Accordingly, the drawings and description are to be regarded as illustrative and not restrictive. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a perspective schematic illustration of an embodiment of a clamp and saw coupling assembly according to the present subject matter.

[0017] Figure 2 Shown in an engaged configuration Figure 1 The clamp and saw connection assembly.

[0018] Figure 2A is associated with a typical clamping system Figure 1 Exploded assembly view of the clamp and saw connection assembly.

[0019] Figure 3 An embodiment of a chip deflector according to the present subject matter is shown.

[0020] Figure 4 An embodiment of a quick connect pin assembly according to the present subject matter is shown.

[0021] Figure 5 Shows the use of Figure 4 The quick connect pin assembly joins the saw to the clamp assembly.

[0022] Figure 6 An embodiment of a saw attachment latch plate assembly according to the present subject matter is shown.

[0023] Figure 7 Details of another embodiment of a quick connect pin in accordance with the present subject matter are shown.

[0024] Figure 8 Details of an embodiment of an insertion guide assembly for use in the clamp and saw coupling assembly of the present subject matter are shown.

[0025] Fig. 9 Shows Figure 8 The clamp and saw coupling assembly of the embodiment of the present invention with the saw in a "ready" position.

[0026] Fig.10 Details of an embodiment of an interlock system according to the present subject matter are shown.

[0027] Fig.11 An embodiment of a blade guard system in accordance with the present subject matter is shown.

[0028] Fig.12 Shown in a fully protected configuration Fig.11 Blade protection system.

[0029] Fig.13 Shown with the saw rotating and the rear guard open Fig.11 Blade protection system.

[0030] Fig.14 The saw blade is shown in a configuration in which it is depicted cutting a tube. Fig.11 Blade protection system.

[0031] Fig.15 Shows Fig.11 Blade guard system with the saw in the "extended" position.

[0032] Fig.16 Details of an embodiment of a chip management system provided with a chip channel in a saw according to the present subject matter are shown.

[0033] Fig.17 An embodiment of a chip management system according to the present subject matter is shown in which a secondary chip channel in a saw is mounted with a shroud.

[0034] Fig.18 Shows Fig.17 A chip channel in which the cover is removed.

[0035] Fig.19 Shows that there is Fig.17 Additional detail of the chip management system of the chip channel, showing the initial exit.

[0036] Figures 20A-20D An embodiment of a horizontal spring pin assembly associated with a clamp and saw coupling assembly in accordance with the present subject matter is shown.

[0037] Figure 21A-21G An embodiment of a selectively positionable spring pin assembly associated with a clamp and saw coupling assembly in accordance with the present subject matter is shown.

[0038] Figure 22A-22E An embodiment of a slotted assembly associated with a clamp and saw coupling assembly according to the present subject matter is shown.

[0039] Figure 23A-23H An embodiment of a swivel clamp connection associated with a clamp and saw coupling assembly in accordance with the present subject matter is shown.

[0040] Figure 24A-24K An embodiment of a spring pin connection associated with a clamp and saw coupling assembly according to the present subject matter is shown.

[0041] Figure 25A-Figure 25D An embodiment of a dovetail connection associated with a clamp and saw connection assembly in accordance with the present subject matter is shown.

[0042] Figure 26A-26CAn embodiment of a shaft clamp connection associated with a clamp and saw coupling assembly in accordance with the present subject matter is shown.

[0043] Figure 27A-Figure 27D An embodiment of a toggle clamp connection associated with a clamp and saw coupling assembly in accordance with the present subject matter is shown.

[0044] Figure 28A-28I An embodiment of a cam locking connection associated with a clamp and saw coupling assembly according to the present subject matter is shown.

[0045] Figure 29A-29B Another embodiment of a cam locking connection associated with a clamp and saw coupling assembly in accordance with the present subject matter is shown.

[0046] Figure 30A-Figure 30B An embodiment of a dual cam locking knob connection associated with a clamp and saw coupling assembly in accordance with the present subject matter is shown.

[0047] Figures 31A-31D An embodiment of a cam knob and pin connection associated with a clamp and saw coupling assembly according to the present subject matter is shown.

[0048] Figure 32A-32B An embodiment of a spring loaded lever connection associated with a clamp and saw coupling assembly according to the present subject matter is shown.

[0049] Fig.33 An embodiment of a spring loaded knob connection associated with a clamp and saw coupling assembly according to the present subject matter is shown.

[0050] Figure 34A-Figure 34B An embodiment of a spring biased quick release pin connection associated with a clamp and saw coupling assembly in accordance with the present subject matter is shown.

[0051] Figure 35A-Figure 35C An embodiment of a hook connection associated with a clamp and saw coupling assembly according to the present subject matter is shown.

[0052] Fig.36 and Fig.37 An embodiment of a chop saw assembly is shown having various accessories described herein.

[0053] Fig.38 and Fig.39 The saw assembly is shown in combination with a clamping assembly, a saw coupling assembly and a workpiece. Fig.36 and Fig.37 A saw assembly wherein the saw is in a “ready” position.

[0054] Fig.40 and Fig.41 Shown Fig.38 and Fig.39 A saw assembly wherein the saw is in an “extended” position. DETAILED DESCRIPTION

[0055] The present subject matter provides a power cutting tool, more specifically a power rotary tool, and in particular a power tube manufacturing tool or a rotary saw. The present subject matter also provides various accessories for tools used with cylindrical workpieces such as tubes. In particular, the present subject matter provides accessories for clamping systems and tube cutting saws. These accessories include a clamp and saw coupling assembly between the saw and the clamping system, a quick connection assembly between the saw and the clamping system, an insertion guide assembly, an interlock switch assembly, a blade guard system, and a chip management system and / or a chip deflector. Each of these accessories can be used independently or individually, or in various combinations. Details of these and other aspects are described herein. Although the term "saw" is used herein, it should be understood that the term includes other tools and / or operations for cutting workpieces, such as grinders for grinding and cutting wheels for cutting or removing workpiece material.

[0056] In order to more easily attach the saw to a fixture or clamping assembly for a pipe or workpiece, the present subject matter provides a removable saw coupling assembly between the saw portion of the assembly and the clamping system. In this way, the user can place the clamp or clamping assembly on the pipe or workpiece and fasten the clamp to the pipe without the need for additional weight and cutting parts of the saw. The user can then attach the saw portion of the tool to the clamp portion and complete the cut as desired. The saw coupling assembly can utilize common fasteners (e.g., hex head screws) that require tools to remove and install, or can be configured using a tool-free removal or installation method. One such method of tool-free quick connection between the clamp and saw portion of the tool is characterized by alignment pins arranged on the saw base or clamp base and alignment holes on the opposing parts so that when the saw is correctly set relative to the clamp, the alignment pins are coaxial with the alignment holes. In use, the operator will install the clamp on the pipe workpiece, align the cut indicator with the desired cut line, and then lower the saw base onto the clamp base, where the alignment pins engage the alignment holes. The operator will then tighten the one or more threaded knobs to complete the alignment of the saw base with the clamp base and fully secure the saw to the clamp.The threaded knob can be configured so that it is retained to the saw base via the use of a countersunk hole.

[0057] Figure 1 , Figure 2 and Figure 2A An embodiment of a clamp and saw coupling assembly 10 according to the present subject matter is shown. The clamp and saw coupling assembly shown (or intermittently referred to herein as a "saw coupling assembly") is used with a clamping system such as that described in U.S. Application No. 16 / 591,753 filed on October 3, 2019. Figure 2A is combined with the clamping system generally indicated as 2 Figure 1 and Figure 2Exploded assembly diagram of a saw coupling assembly of the invention. The clamping system 2 includes a base 2B having a threaded member or threaded region. Typically, the threaded region is in the form of a recess or hole having a helical thread. The clamping system 2 also includes a pair of arms, the pair of arms including a first arm 2C defining a proximal end portion and an opposite distal end portion. The first arm 2C also defines a guide groove extending at least partially between the ends. The pair of arms also includes a second arm 2D, the second arm 2D defining a proximal end portion and an opposite distal end portion. The second arm 2D also defines a guide groove extending at least partially between the ends. In many versions, one or more rollers are disposed at or near the distal ends of the arms. For example, a first roller is disposed at the distal end portion of the first arm, and a second roller is disposed at the distal end portion of the second arm. Each arm can utilize multiple rollers. The first arm 2C and the second arm 2D are pivotally supported and fixed to the base 2B. The clamping system 2 also includes a shaft 2E defining a proximal end portion and an opposite distal end portion. The shaft 2E also defines a threaded region. The shaft 2E is threadedly engaged with the base 2B via the threaded region of the base 2B. The clamping system 2 also includes a slidable central carriage 2A. The central carriage 2A includes a central roller or rollers rotatably fixed to the central carriage. The central carriage 2A is rotatably attached to the distal end of the shaft 2E so that the shaft can rotate without transmitting such rotation to the central carriage 2A. The central carriage 2A is movably held to a pair of arms, namely a first arm and a second arm as described herein. Additional details and aspects of the clamping system 2 are provided in the application.

[0058] Further references Figure 1 , Figure 2 and Figure 2A , the saw coupling assembly 10 includes a clamp base 20 fixed to the clamp system 2 and a detachable or selectively removable saw base 40. In the particular depicted version of the saw coupling assembly 10, the clamp base 20 includes one or more outwardly extending alignment pins 22 protruding from an engagement surface 24 of the clamp base 20. The clamp base 20 also includes a plug hole or threaded hole 26 accessible along the engagement surface 24 of the clamp base 20. Typically, the alignment pins 22 and the threaded hole 26 extend transverse to the plane of the engagement surface 24. However, the present subject matter includes variations and alternative configurations. The saw base 40 defines at least one alignment hole 42 in the engagement surface 44. The engagement surface 44 of the saw base 40 faces the engagement surface 24 of the clamp base 20, and once the bases 20, 40 are engaged together, the engagement surface 44 of the saw base 40 contacts the engagement surface 24 of the clamp base 20. The alignment holes 42 of the saw base 40 are positioned and arranged in the saw base 40 such that once the bases 20, 40 are engaged together, the alignment pins 22 of the clamp base 20 extend within the alignment holes 42 of the saw base 40. Thus, the alignment holes 42 are also sized and shaped to snugly receive and engage corresponding alignment pins 22 of the clamp base 20. Typically, the alignment holes 42 extend transversely to the engagement face 44 of the saw base 40. However, the present subject matter encompasses variations and alternative configurations.

[0059] Once the saw base 40 is coupled to the clamp base 20 by contacting the respective engagement surfaces 44 and 24 of the saw base 40 and the clamp base 20 and inserting the alignment pin 22 into the alignment hole 42, the saw base 40 can be selectively retained or attached to the clamp base 20 by one or more fasteners, such as a threaded knob 46 with a protruding threaded member 47. In some versions, the threaded knob 46 and member 47 are rotatably retained with the saw base 40. The threaded knob 46 is arranged and positioned on the saw base 40 so that once the saw base 40 is coupled to the clamp base 20, the threaded member 47 is threadedly received by the tapped or threaded hole 26 of the clamp base 20. Therefore, as will be understood, the threaded member 47 of the threaded knob 46 extends from the engagement surface 44 of the saw base 40. Generally, the threaded member 47 extends laterally from the surface 44. However, the present subject matter includes variations and alternative configurations. The knob 46 is generally accessible along a proximal side 48 of the saw base 40 that is opposite the engagement surface 44 of the saw base 40 .

[0060] The saw coupling assembly 10 may be positioned in Figure 1 The unconnected configuration shown and e.g. Figure 2 Between the described connection configurations, in the connection configuration, the engaging surface 24 of the clamp base 20 contacts the engaging surface 44 of the saw base 40, at least one alignment pin 22 of the clamp base 20 is arranged in at least one alignment hole 42 of the saw base 40, and at least one threaded member 47 of the saw base 40 is threadedly engaged with at least one threaded hole of the clamp base 20.

[0061] A knob 46 of the saw base 40 accessible along a proximal side 48 of the saw base 40 can be rotated to further engage and tighten its corresponding threaded member 47 with the tap hole 26 of the clamp base 20. This serves to selectively retain and attach the saw base 40 to the clamp base 20.

[0062] The clamp base 20 generally includes a mounting area 30 for attaching or securing to a clamp system such as the clamp system 2. The mounting area 30 can be integrally formed with or attached to the clamp base 20. As will be appreciated, the clamp base 20 and / or the mounting area 30 are generally attached or secured to the clamp system by one or more threaded fasteners 32. The clamp base 20 also defines a longitudinal slot 34 extending through the clamp base and accessible along the engagement surface 24. The longitudinal slot 34 is sized and shaped to accommodate a saw blade (not shown) inserted or disposed therein. The saw base 40 also defines a longitudinal slot 54 extending through the saw base 40. The longitudinal slot 54 is sized and shaped to accommodate a saw blade (not shown) inserted or disposed therein. The longitudinal slot 34 of the clamp base 20 is arranged and positioned in the clamp base 20 and / or the longitudinal slot 54 of the saw base 40 is arranged and positioned in the saw base 40 so that once the bases 20, 40 are coupled together, the longitudinal slots 34, 54 are aligned with each other. Thus, the orientation of the slots 34, 54 enables the saw blade to extend through both slots 34, 54.

[0063] In certain versions, the subject matter also provides a chip deflector that collects and deflects metal chips that have been removed from the tube during the cutting process and prevents the chips from striking an operator or bystander. As the cutting blade passes through the tube, small metal chips, typically equal to the width of the cutting blade, are removed and pushed out of and away from the tube or workpiece in the direction of rotation of the cutting blade at a relatively high velocity. The deflector is arranged so that these chips are slowed and redirected toward the workpiece and tool, wherein the redirection in turn further reduces the velocity and will cause the chips to land near the workpiece being cut rather than being ejected away from the workpiece. The deflector can be configured for use with all tube sizes within the application range of the clamp / saw.

[0064] In many embodiments, the chip deflector can also be pivoted and biased toward the tube to minimize the gap through which the chips can be ejected. Alternatively, a flexible chip deflector (not shown) can be configured to always be in contact with the circumference of the tube to be cut. However, the present subject matter includes variations and alternative configurations.

[0065] Figure 3 An embodiment of a chip deflector 60 according to the present subject matter is shown. Figure 3A chip deflector 60 is depicted in association with the aforementioned saw coupling assembly 10 for use in conjunction with the clamp assembly 2. The chip deflector 60 includes one or more walls 66 for deflecting and redirecting metal chips. The chip deflector 60 defines an inlet 62 for providing access to an interior area defined by the walls 66. The chip deflector 60 also defines an outlet 64. The chip deflector 60 is releasably secured to the saw coupling assembly 10, particularly to either the clamp base 20 or the saw base 40. The deflector 60 is arranged relative to the saw coupling assembly 10 such that metal chips generated and dispersed during a cutting or machining operation enter the deflector 60 (e.g., through the inlet 62), contact the walls 66, and exit the deflector 60 through the outlet 64.

[0066] In addition to the aspects and features described herein, a quick connect assembly can be used to conveniently and quickly couple the saw portion of the assembly to the clamp portion. Figure 4 A preferred embodiment of a quick connect assembly is shown. The illustrated embodiment features a large pin with a conical region and a tip and circumferential groove that have two functions: locking the saw portion of the assembly to the clamp portion, and providing a pivot axis about which the saw portion rotates to provide blade penetration to completely cut through the wall of a pipe or workpiece. In certain embodiments, the subject matter also includes a slotted guide opposite the pin. These aspects are described in greater detail herein.

[0067] Specifically, Figure 4 A quick connect pin 70 is shown mounted to a center carriage 2A or similar component of a clamping system 2. The quick connect pin 70 defines a distal tip 72, a cylindrical base 74, and a conical transition region 76 between the tip 72 and the base 74. The pin 70 further defines a circumferential groove 78 extending around the periphery of the pin 70. Typically, the groove 78 is located within the base 74 or between the base 74 and the conical region 76. Typically, the pin 70 extends from the center carriage 2A in a direction parallel to the longitudinal axis of the workpiece 4 to which the clamping system 2 is engaged.

[0068] Figure 4 Also shown is an optional slotted guide 90 provided in association with the clamping system 2 (and in particular the central carriage 2A). Figure 8 The slotted guide is described in more detail in connection with the insertion guide assembly with alignment plate shown in FIG.

[0069] To attach the saw unit to the clamp, the user would align the main pivot hole of the saw unit with the axis of the quick connect pin of the clamp and then Figure 5 As shown, the saw unit is slidably mounted on the pin. Specifically, Figure 5 A clamping system 2 is shown, which has the previously combined Figure 4 The quick connect pin 70 and saw assembly 100 are described.

[0070] The conical area and tip of the quick connect pin act to open a latch plate that is integral to the saw unit. The latch plate is spring biased into the engaged position, but the large lead-in chamfer of the conical tip of the quick connect pin acts to compress the biasing spring and allow the latch pin to rotate about a fixed pivot point. In this way, no user input is required to latch the saw unit to the clamp unit. Movement of the latch plate occurs by sliding the saw unit onto the clamp. When installed, the concave cutout in the latch pin engages with the circumferential groove in the quick connect pin, thereby locking the saw unit and clamp unit together.

[0071] Figure 6 An embodiment of a positionable latch plate 110 of a saw assembly 100 is shown engaged with the aforementioned quick connect pin 70. The latch plate 110 is pivotally positioned about a pivot member 112. Figure 6 As shown in FIG. 1 , a spring or other biasing member 114 is provided to urge the latch toward the engaged position. The latch plate 110 defines a cutout 116, which is preferably a concave cutout, sized and shaped to fit snugly and is particularly disposed in the circumferential groove 78 of the pin 70 (see FIG. 1 ). Figure 4 ). The cutout engages with the groove to limit axial movement. The subject matter also includes an assembly wherein the cylindrical bore of the alignment plate is axially arranged with the pin to engage the pin in the bore.

[0072] To remove the saw unit from the clamp, the user will depress the latch plate manual release point to pivot the latch plate concave cutout out of engagement with the circumferential groove of the quick connect pin and then slidably translate the saw unit along the axis of the quick connect pin to disengage.

[0073] The quick-connect pin of the clamping system is optimally configured to utilize two different diameters of corresponding drilled surfaces on the engaging saw unit. Compared with a single diameter interface, these different diameters improve the ease of installing the saw unit or removing the saw unit from the clamping unit by separating the hole and the axial surface of the small gap more quickly. The transition between the two different diameters can be achieved in many ways, but in many embodiments, the present subject matter provides a tapered transition. Similarly, the interface between the quick-connect pin of the clamp and the pivot hole of the saw unit is optimally configured using a bushing or bearing that promotes easy axial installation and rotation during use, and prevents burrs or other surface wear that may occur in the connection. It should be understood that the quick-connect pin can also utilize two different cross-sectional shapes, such as a first region with a square cross-section and a second region with a round or circular cross-section. In addition or alternatively, the quick-connect pin can use two or more regions with different sizes or cross-sectional spans.

[0074] Figure 7Another embodiment of a quick connect pin 70 is shown that utilizes two different diameters to engage corresponding drilled surfaces or holes on a saw unit. In this version, the pin 70 defines a first circumferential region 71 having a first diameter D1, a second circumferential region 73 having a second diameter D2 greater than D1, and a tapered transition region 75 extending between the regions 71 and 73. Typically, the aforementioned groove 78 is between the two regions 71, 73 having different diameters. And in some versions, the groove 78 is also between the first region 71 and the transition region 75.

[0075] When the saw unit is properly mounted to the quick connect pin, the saw unit can be rotated on the quick connect pin of the clamping system until the alignment plate on the saw unit engages the slotted guide of the clamp. The close tolerance slotted guide receives the alignment plate and controls the orientation of the saw unit to the clamp to ensure that the tool is used effectively and accurately without misalignment when cutting a workpiece.

[0076] Figure 8 An embodiment of an insertion guide assembly is shown that includes an alignment plate 120 attached to the saw assembly 100. The alignment plate 120 is Figure 4 The associated slotted guide 90 is engaged. The slotted guide 90 is attached or otherwise fixed to the clamping system 2 (particularly the central carriage 2A). The insertion guide assembly comprises an alignment plate 120 and the slotted guide 90.

[0077] When the saw unit is rotated, for example about a quick connect pin, the entry slot on the alignment plate of the saw unit presses the spring biased depth lock pin onto the clamp until the depth lock pin reaches the cylindrical hole, which allows the spring biased pin to extend and lock the saw in place. In this way, the saw unit is fully assembled to the clamp without requiring user input to lock it in place, and is arranged in a "ready" position for use.

[0078] Figure 8 and Fig. 9 The engagement between the alignment plate 120 of the saw 100 and the slotted guide 90 of the clamping system 2 is shown. The alignment plate 120 defines an entry slot 122 that provides access to a cylindrical hole (not shown). The guide slot 90 includes an axially positionable depth locking pin 92. The pin 92 is normally biased to an engaged position. Once the alignment plate 120 and the guide slot 90 are engaged, the entry slot 122 presses or otherwise actuates the pin 92 so that the pin 92 engages the cylindrical hole in the alignment plate 120, thereby locking the saw 100 in a fixed position relative to the clamping system 2.

[0079] To cut through the pipe wall, the user turns on the power of the tool to start the cutting blade rotation, and then retracts the depth lock pin to disengage the pin from the hole in the ready position of the saw unit. The user will rotatably guide the saw unit to cut through the pipe wall until the depth lock pin engages with the hole in the extended position of the alignment plate. When said engagement occurs, the saw unit has reached its maximum extended rotational travel and is locked in place. The user can then guide the saw unit circumferentially around the pipe to separate the workpiece.

[0080] The present subject matter also provides for the use of an interlock switch assembly that prevents use of the cutting head when the saw unit is not mechanically attached to the clamping system. There are many ways to accomplish this, with a preferred embodiment utilizing a micro switch that electrically interrupts / disconnects the saw motor from the power source when the quick connect pin is not installed through the main pivot hole of the saw unit. When the quick connect pin is engaged by the saw, the actuating paddle is pivoted to engage the interlock switch, thereby closing the circuit and allowing use of the tool. Thus, in many versions, by inserting the saw into the clamping system through the receiving feature, an electrical switch is closed, thereby allowing operation of the saw.

[0081] Fig.10 An embodiment of an interlock system 130 in accordance with the present subject matter is shown. The interlock system 130 is incorporated into a saw assembly 100 that includes a receiving hole 102 or main pivot hole that is sized and shaped to accommodate and receive a quick connect pin 70. The interlock system 130 includes a positionable paddle 132 having an engagement end 134 and a working end 136. The positionable paddle 132 is capable of being pivotally mounted to the saw assembly 100 via a pin 138 or similar member. The interlock system 130 also includes an electrical switch 140 having a lever contact 142 that is positionable between an open state and a closed state, the closed state occurring when the quick connect pin 70 is inserted into the receiving hole 102, thereby moving the positionable paddle 132 to cause closure of the switch contact 142 and thereby completing an electrical circuit. It should be understood that Fig.10 Two positions of the lever contact 142 are shown: an open position and a closed position.

[0082] The present subject matter also provides a blade guard system. The saw unit has a plurality of and typically two blade guards that pivot about the same axis as the saw cutting blade. The blade guards are spring biased to Fig.11 The closed position shown has an optional stop that controls the rotational travel limit of the blade guard. Optimally, a single spring is used to bias the guards toward each other and prevent the user from accessing the blades. In another embodiment, two separate springs can be used to independently control each blade guard. Ideally, the stop is composed of a rubber material to reduce wear on the guards.

[0083] Specifically, Fig.11 and Fig.12An embodiment of a blade guard system 150 according to the present subject matter is shown. The blade guard system 150 is incorporated into a saw assembly 100 having a rotating blade 101 and includes a front blade guard 152 and a rear blade guard 154. The front blade guard 152 and the rear blade guard 154 pivot about the axis of rotation of the saw blade 101 (shown as axis A). As previously described, one or more springs or other biasing members are used to bias the guards 152, 154 to their respective positions. Fig.11 Thus, the blade guard reduces access to the saw blade 101 when closed. The blade guard system 150 can include a stop 156 that controls or limits the range of rotational travel of the guards 152, 154 about the axis A.

[0084] Further references Fig.12 When the saw unit 100 is mounted to the clamping system 2 , the spring biased front and rear blade guards 152 , 154 cover the teeth of the blade 101 that would otherwise extend from the saw 100 .

[0085] refer to Fig.13 When the user rotates the saw unit 100 about the quick connect pin 70 to reach the "ready" position of the saw unit, the rear blade guard 154 contacts the outer diameter of the tube 4 via the protruding fins 155 along the outer contour of the guard 154. The fins 155 are configured together with similar fins 153 on the front blade guard 152 so that the pivoting movement of the saw 100 causes the blade guards 152, 154 to be pushed or otherwise displaced to overcome the spring bias and open, thereby allowing the blade 101 to contact the surface of the tube 4. Fig.13 The initial opening of the rear blade guard 154 is shown due to the contact with the saw in the "ready" position.

[0086] refer to Fig.14 When the user wants to cut the pipe 4, the saw blade engages the pipe 4 and the user rotatably moves the saw 100 to extend the blade 101 into the wall of the pipe 4. With this further extension rotation, the rear blade guard 154 continues to pivot further open, and the fins 153 on the front blade guard 152 similarly cause the front blade guard 152 to pivot about its axis and further expose the saw blade 101 for full contact into the pipe wall.

[0087] refer to Fig.15, the blade guard rotation continues until the saw 100 reaches the fully extended position. In this position, and all of the positions previously described, the teeth of the guard blade 101 are covered to prevent direct contact with the end user; the only exposure of the cutting blade teeth occurs inside the tube 4. Furthermore, the pivotal movement of the front blade guard 152 and the rear blade guard 154 about the same axis as the cutting blade 101 is desirable because it prevents unintentional movement of the guards by wedging (or linear movement) between the tube 4 and the saw 100. In other words, the pivotal movement of the guards 152, 154 prevents access to the blade 101 between the tube 4 and the saw 100. Thus, attempts to open the guards in this area will not be successful.

[0088] The present subject matter also provides a chip management system for optimal use of the saw. In the described embodiment, the front blade guard has a diverging profile opening that allows chips to exit the blade teeth after they are generated by the tube wall. In other words, the blade guard profile does not have a circular profile with a central position coaxial with the blade, thereby creating a greater radial distance between the blade and the guard as the chips move away from the tube or workpiece. In addition, the housing of the saw is configured with a large chip exit channel that quickly directs the chips out of the main saw blade housing, thereby reducing the amount of chips circulating around the housing.

[0089] refer to Fig.16 , an embodiment of a chip management system 160 incorporated into a saw 100 is shown. The chip management system 160 includes a blade guard 162. The blade guard 162 is disposed adjacent to or beside a rotating blade 101 of the saw 100. The blade guard 162 differs from the previously described front blade guard 152 in that the blade guard 162 utilizes an interior region having one or more diverging walls 164 that extend toward an outlet 166 directed away from the saw blade 101. Reference to diverging walls refers to the orientation of the walls that diverge away from the circumference of the blade. In addition, the chip management system 160 includes one or more main channels 168 defined within or by the body or housing of the saw 100. The channels 168 are configured (i.e., sized, shaped, and / or oriented to) direct chips out of the saw 100. Specifically, a passage 168 extends between the outlet 166 of the blade guard 162 and the opening 163 in the saw 100 to dislodge the cuttings.

[0090] In some embodiments, when the chips reach the exit channel, they enter another channel 169 on the opposite side of the saw or similar tool. Fig.17 and Fig.18 , which respectively show the channel 169 with and without the protective cover installed. Specifically, Fig.17 and Fig.18The saw 100 is shown with a secondary passage 169 within the body or housing of the saw 100. A port 172 or other opening provides for the flow of chips from the aforementioned primary passage 168 to the secondary passage 169. One or more protective shields 170 can be used to surround the passage 169.

[0091] In this manner, high speed chips are slowed down by the change in direction caused by the exit passage. That is, in many embodiments, turning or changing the direction of the chips is important to slowing down the speed of the chips. Also, the chips are directed back toward the tube or workpiece to reduce their ejection toward the operator. The configuration helps control the chip path and improves the required cleanup by limiting the range of chip locations after exiting the tool.

[0092] For some tube materials, such as polymeric materials, the separated chip segments tend to bunch together after leaving the blade and cooling. For such materials, it is desirable to expel the chips from the saw unit more quickly. Therefore, the optional deflection door is configured to allow the material to leave the saw unit system earlier than through the entire channel distance when opened. In addition, the larger opening reduces the possibility of the chips gathering on obstacles and agglomerating.

[0093] Fig.19 An embodiment of a selectively positionable deflectable door 174 is shown that provides access to the port 172 and / or the primary channel 168 and / or the secondary channel 169 in the saw 100. As will be appreciated, once opened, e.g. Fig.19 The door 174 shown in FIG. 1 allows chips to approach and exit early from the saw 100. A variety of assemblies can be used for selective positioning of the door 174, such as a hinge assembly 176. However, the present subject matter encompasses variations and alternative configurations.

[0094] Furthermore, in certain versions, the present subject matter also provides, as an alternative to or in addition to a chip management system, a chip deflector as previously described herein.

[0095] The present subject matter also provides a method of quickly attaching and removing a saw to and from a clamping system that can be accomplished with a number of different components. One such alternative has a spring pin mounted to a saw base or clamp base that guides into a hole in a counterpiece (saw base or clamp base) to hold the saw fixed to the clamp. Details of the spring pin and other components, particularly those for selectively engaging and / or retaining the clamp base 20 with the saw base 40, are described herein.

[0096] Additional aspects

[0097] Figures 20A-20DAn embodiment of a spring pin assembly 180 is shown. The spring pin assembly 180 is incorporated into the clamp base 20 and the saw base 40 of the saw coupling assembly 10. The spring pin assembly 180 includes at least one axially positionable member that is biased to extend axially, such as a first spring pin 182 and a second spring pin 184. The first spring pin 182 is mounted or otherwise secured to a first mounting hole region 183 of the clamp base 20. The second spring pin 184 is mounted or otherwise secured to a second mounting hole region 185 of the clamp base 20. The saw base 40 defines a first receiving hole 186 and a second receiving hole 188. The receiving holes 186, 188 are configured to receive corresponding engagement members of the spring pin 182 and the spring pin 184. As will be appreciated, the spring pins 182, 184 include axially positionable members that are generally biased to extend axially into an engaged position. Once the clamp base 20 and the saw base 40 are engaged and properly aligned, the members of the spring pins 182, 184 are aligned with the receiving holes 186, 188 and are biased to extend axially into engagement therewith. As previously mentioned, the present subject matter includes embodiments in which one or more of the spring pins are disposed on the saw base 40 rather than the clamp base 20. The present subject matter includes orienting the spring pins and receiving holes in different orientations other than the horizontal orientation shown in the referenced figures.

[0098] Another such assembly utilizes a spring pin that allows the saw base to pivot in position relative to the clamp base, and then uses threaded knobs at opposite ends to securely hold the two. However, the present subject matter encompasses variations and alternative configurations.

[0099] Figure 21A-21GAn embodiment of a selectively positionable spring pin assembly 200 is shown. The assembly 200 is used in association with a clamp base 20 and a saw base 40. The assembly 200 includes an axially positionable member (e.g., a spring pin 202) that is biased to extend axially. The assembly 200 also includes a receiving hole 203 in the clamp base 20 that is configured to receive and engage a member of the spring pin 202. The spring pin 202 is depicted as being mounted on the saw base 40, but can be mounted on the clamp base 20 with appropriate repositioning of the receiving hole in the saw base 40. The spring pin assembly 200 also includes a hinge assembly 204 having a hinge member 206. The hinge assembly 204 movably retains the saw base 40 to the clamp base 20. The hinge assembly 204 enables the saw base 40 to be selectively positionable about a hinge axis 208 defined by the hinge member 206. Although a variety of assemblies can be used for the hinge assembly 204, a preferred version is depicted in the drawings wherein the clamp base 20 includes at least one outwardly projecting hinge finger 210, and the saw base 40 includes at least one outwardly projecting hinge guide 212. As will be appreciated, each of the hinge finger 210 and the hinge guide 212 defines an aperture 211, 213 through which the hinge member 206 extends when the saw base 40 is assembled to the clamp base 20. The slotted opening on the saw base 40 can allow a threaded connector integral to or otherwise associated with the clamp base to rigidly engage and hold the two together when inserted and tightened.

[0100] Figure 22A-22E An embodiment of a slotted assembly 220 for use with the saw coupling assembly 10 is shown. The slotted assembly 220 utilizes one or more slots 224 disposed in the saw base 40, one or more threaded holes 226 in the clamp base 20, and one or more threaded members 222 extending in the slots 224 and threadedly engaged to the threaded holes 226 of the clamp base 20. As will be appreciated, in the described embodiment, a user attaches a saw (not shown) to the saw base 40 by aligning the slots 224 of the saw base 40 with the threaded members 222 of the clamp base 20 and slides the saw base 40 laterally into place on the clamp base 20. Once the members 222 are properly aligned and inserted as shown, the saw base 40 is secured to the base 40. Fig.22D 224 , the member 222 can be tightened to releasably secure the saw base 40 to the clamp base 20 .

[0101] like Figure 23A-23H As shown, a rotating fixture can be similarly used to rotate and engage two bases to bring them into contact. Specifically, Figure 23A-23HAn embodiment of a rotating clamp assembly 250 according to the present subject matter is shown. The rotating clamp assembly 250 is used to secure or otherwise engage the clamp base 20 with the saw base 40. The rotating clamp assembly 250 includes one or more (and particularly a plurality of) rotating clamps 260. Each rotating clamp 260 is typically pivotally or movably secured to the clamp base 20 at a base 262 of the rotating clamp 260. The saw base 40 includes one or more receiving slots 264 for receiving a corresponding rotating clamp 260. As will be appreciated, the saw base 40 can be releasably attached or secured to the clamp base 20 by positioning the saw base 40 relative to the clamp base 20 so that the receiving slots 264 are aligned with the rotating clamps 260 and then bringing the bases 20, 40 into contact. Each rotating clamp 260 is then pivoted or otherwise positioned so that it extends through its corresponding slot 264 and the head or gripping member 266 of the rotating clamp is disposed on and in contact with the saw base 40. The present subject matter also includes adjustable threaded fasteners (such as 267 shown) rather than an integral head or gripping member 266. It should be understood that the arrangement of components can be reversed so that the rotating clamp 260 is pivotally secured to the saw base 40 and is received in a slot of the clamp base 20.

[0102] like Figure 24A-24K As shown, a spring pin mounted to one of the base plates can be used to engage a clearance hole in the opposing base plate to retain the saw base to the clamp base. Figure 24A-24K An embodiment of a spring pin assembly 270 for use in association with the saw coupling assembly of the present subject matter is shown. The spring pin assembly 270 is used to attach the clamp base 20 to the saw base 40 or otherwise engage therewith. The spring pin assembly 270 includes one or more spring pins 272. Each spring pin 272 includes an axially positionable member 274 and a spring 276 or other biasing member that is generally configured to urge the member 272 axially outward. Each spring pin 272 can also include a handle 278. The spring pins 272 are generally positioned along the engagement surface 44 of the saw base 40. The clamp base 20 includes a plurality of access ports 280 that are sized and positioned to accommodate the spring pins 272 so that once the bases 20, 40 are in contact and engaged together, the spring pins 272 extend through the clamp base 20 and can be accessed along the clamp base. Figure 24G-Figure 24K A variation of a spring pin assembly 270 is depicted in which the user aligns a protrusion on the saw base 40 with an opening on the clamp base 20 and then slides the saw and corresponding saw base to engage features that hold the two in contact while the pin is inserted. The pin then locks the two components together.

[0103] like Figure 25A-Figure 25D As shown, a dovetail connection incorporated into the saw base and the clamp base can be used to hold the two components together, and then screws are used to keep the connection taut and prevent unintentional separation. Specifically, Figure 25A-Figure 25D Aspects of an embodiment of a dovetail coupling assembly 280 associated with the present subject saw coupling assembly are shown. The dovetail coupling assembly 280 includes a dovetail component 282 and an axially positionable adjustment member 284 which can be in the form of a threaded member threadably engaged in a threaded bore of the clamp base 20, for example. Fig.25B Different orientations for the axially positionable adjustment member are presented (e.g. Fig.25A ), the adjustment member can alternatively work with the dovetail attachment.

[0104] The entire saw base can be mounted to a horizontally oriented shaft via a collar clamp system. In this manner, the user slides the female ring of the saw base onto the male shaft of the clamp base and then tightens the clamp to attach the two components together. Figure 26A-26C Specifically, Figure 26A-26C An embodiment of a shaft clamp connection assembly 290 associated with a saw coupling assembly according to the present subject matter is shown. In the version depicted, the clamp base 20 includes a male shaft member 292 about which a female shaft collar 294 associated with the saw base 40 is disposed. The female shaft collar 294 can be circumferentially adjusted via an adjustment member 296. A threaded engagement 297 can be used such that rotation of the member 296 about its longitudinal axis causes the shaft collar 294 to be sized about the shaft 292.

[0105] A toggle clamp can similarly be used to pull and hold the saw base to the clamp base. The toggle clamp can be configured over center to achieve a latching mechanism, or pulled to a specific position to complete the clamping action. Figure 27A-Figure 27D shown in . Specifically, Figure 27A-Figure 27D An embodiment of a toggle clamp assembly 300 in accordance with the present subject matter is shown. The toggle clamp assembly 300 is used to releasably engage the saw base 40 to the clamp base 20. The toggle clamp assembly 300 includes one or more toggle clamps 302. The toggle clamp 302 is typically attached to the clamp base 20 and releasably engages the saw base 40. In many versions, the toggle clamp 302 engages the saw base 40 at a platform 304. The toggle clamp moves over center to lock in position and hold the saw base to the clamp base. Fig.27B Hook 301 is shown engaged with a toggle clamp 302 under tension to tighten the coupling. Fig.27C It is shown how a hook 301 can be arranged on the saw base 40 to allow an over center mounted clamp base to engage with the toggle clamp 302 . Fig.27DTwo toggle clamps 302 are shown attached to the clamp base 20, engaging with hooks 301 on each end of the saw base. The saw base 40 is placed on the clamp base 20 and aligned via the pins 303 of the clamp base 20 passing through slots 305 in the saw base 40, and the system is then fastened together via the toggle clamps 302 on the hooks 301 present on the saw base 40.

[0106] The cam lock knob can be arranged so that when the knob integral to the saw base is turned, the male feature in the clamp base engages. The cam profile will then draw the saw base and clamp base together with sufficient force to hold the parts in place. This Figure 28A-28I shown in . Specifically, Figure 28A-28I An embodiment of a cam lock knob assembly 310 of a saw coupling assembly according to the present subject matter is shown. The cam lock knob assembly 310 includes an adjustment cam assembly 312, which includes a member 314 having a positionable cam 316. As will be appreciated, the member 314 and the cam 316 are attached or fixed to one of the clamp base 20 or the saw base 40. Once the cam 316 is rotated or otherwise selectively positioned via the member 314, the cam 316 contacts one of the clamp base 20 or the saw base 40 and secures the bases 20, 40 together. The eccentric cam provides a force between the saw base and the clamp base that holds them together.

[0107] like Figure 29A-29B As shown, similar to the cam locking knob, the cam profile knob is capable of clamping the saw base to the clamp base when rotated. Specifically, Figure 29A-29B An embodiment of a cam profile knob 320 is shown. The cam profile knob 320 includes a cam member 322. One or more cam profile knobs 320 can be used to releasably engage the saw base 40 to the clamp base 20. As will be appreciated, Fig.29B Rotation of the illustrated cam profile knob 320 causes engagement between the bases 20 , 40 .

[0108] Two cam locking knobs are capable of retaining the position of the saw base to the clamp base by engaging the cams into grooves on the saw base via the connection between the actuation handle and the cam pins. Figure 30A-Figure 30BA dual cam lock knob assembly 330 is shown associated with the clamp base 20 and the saw base 40. The dual cam lock knob assembly 330 includes two cam lock assemblies 332 fixed to the clamp base 20 and a linkage assembly 334 connecting the cam lock assemblies 332. Once the bases 20, 40 are engaged and positioned in the desired manner, a handle or other member is displaced to translate the linkage 334 and position the cam lock assemblies 332. More specifically, the saw base includes a slot 331 that is sized and positioned to receive a corresponding cam 333 of the cam lock assemblies 332. The user places the saw base 40 onto the clamp base 20. The user then positions the saw base 40 toward the clamp base 20. Fig. 30B The cam lock assembly 332 shown is moved or otherwise displaced. Then, the user actuates the linkage assembly 334 and / or the cam lock assembly 332, thereby engaging the cam 333 with its slot 331. This securely attaches the saw base 40 to the clamp base 20.

[0109] The oval cam can also act as a stop for a spring pin which engages an alignment / locking hole in a mating base. By turning the knob 90 degrees, the spring pin engages or disengages to clamp the saw base to or release it from the clamp base. A pawl can optionally be used to hold the position. This Figures 31A-31D shown in . Specifically, Figures 31A-31D An embodiment of an oval cam knob assembly 340 according to the present subject matter is shown. The oval cam knob assembly 340 includes a selectively positionable cam knob 342 fixed to the saw base 40 and one or more (and typically multiple) spring biasing members 344 associated with the clamp base 20. The cam knob 342 defines one or more concave receiving areas 346 for facilitating gripping by a user. The cam knob 342 includes a cam member 347. The cam knob 342 may optionally include the detent 348.

[0110] Similar to the various cam assemblies described herein, a spring loaded lever can be used to engage a locking pin between the saw base and the clamp base. Figure 32A-32B . Specifically, Figure 32A-32B An embodiment of a spring loaded lever assembly 350 for engaging a saw base 40 and a clamp base 20 according to the present subject matter is shown. The assembly 350 includes one or more (and typically multiple) locking pins 352 that can be axially positioned via a linkage assembly 354. The locking pins 352 engage with a receiving area 356 in the clamp base 20 when axially displaced. A spring or biasing member 358 can be used to bias the pins 352 to a position such as Fig.32A The outwardly protruding engagement position is shown.

[0111] like Fig.33 As shown, similar actuation can be achieved by rotating a knob that moves the connecting rod and engages or disengages the locking pin. Specifically, Fig.33 An embodiment of a spring-loaded knob assembly 360 for use in an assembly of a clamp base 20 and a saw base 40 according to the present subject matter is shown. The assembly 360 includes a rotatable knob 361, one or more (and typically multiple) locking pins 362 that can be axially positioned via a linkage assembly 364. The knob 361 defines a slot 363 in which a guide pin 365 is retained. The guide pin 365 is integral with or attached to the locking pin 362. As will be appreciated, when the knob 361 is rotated, the movement pulls the guide pin 365 via its retention in the slot 363. The movement of the guide pin 365 results in the movement of the locking pin 362. The locking pin 362 engages with a receiving area 366 in the locking base 20 when axially displaced. A spring or biasing member 368 can be used to bias the pin 362 to an outwardly protruding engagement position. In some versions, assembly 360 is integral to the saw and base, and locking pin 362 engages a receiving area 366 in clamp base 20 to hold the components together.

[0112] Another embodiment utilizes a quick release pin with an integral cam profile that engages a pin / tab on the clamp base. When turned or otherwise arranged, the pin / tab changes the axial position of the pin. The cam profile is configured so that the spring force holds the pin in place during use of the tool to prevent inadvertent separation. See Figure 34A-Figure 34B . Specifically, Figure 34A-Figure 34B An embodiment of a spring-biased quick release pin assembly 370 for releasably engaging the clamp base 20 with the saw base 40 is shown. The assembly 370 includes one (and typically multiple) quick release pins 372 having grooves or spiral channels 375 that are retained to the saw base. Corresponding receiving areas 374 are provided in the clamp base 20. Each receiving area 374 includes one or more fingers 376. Once the pin 372 is placed into the area 374 and the fingers 376 are engaged with the grooves 375, the base 20, 40 can be releasably engaged by Fig.34B The rotation of the pin 372 is shown to be secured together. The assembly 370 may optionally include a spring 378 or other biasing member.

[0113] In most of the embodiments described herein, a hook can be used to locate and lock one end of the saw base to the clamp base, thereby reducing the amount of input required when a user attempts to lock or unlock the saw to or from the clamp. Figures 35A-35C . Specifically, Figures 35A-35C 40 is an embodiment of a hook assembly 380 associated with a saw base 40 and a clamp base 20 according to the present subject matter. The hook assembly 380 includes at least one hook member 382 protruding from the clamp base 20. The hook 382 extends through a hole 384 defined in the saw base 40.

[0114] A significant benefit of the present subject matter is its efficiency and ease of use. The setup of the saw and clamp system to the pipe is simplified by using a quick connect embodiment while retaining the precision required to increase efficiency compared to other steel pipe manufacturing methods currently employed. Allowing the saw to be separated from the clamping components improves the user's ability to mount it to the workpiece and reduces the manual labor required.

[0115] Chip deflectors and / or chip management systems improve cleanliness during the cutting process and reduce the time required to clean up after the cut is completed. This provides additional efficiency in the manufacturing process.

[0116] Saw or tube making tools

[0117] A variety of tools (particularly cutting tools) such as power pipe manufacturing tools or cutting saws can be used with the clamping system and / or accessories described herein. Typically, the cutting tool includes a rotating cutting blade driven by an electric motor. The cutting tool can be in the form of an integrated electric rotary blade saw engaged with the clamping system. Examples of such saws are available from Exact Tools under the name EXACTSAW. In other applications, the cutting tool can be in the form of a rotary blade saw driven by a detachable electric drive. Examples of the latter system include the 258 (or 258XL) power pipe cutter and the 700 power drive available from RIDGE TOOL under the name RIDGID. It should be understood that the present subject matter can be used with a variety of cutting tools and / or saws. Non-limiting examples of tools include pipe manufacturing tools, beveling machines, grinders, cutting or grinding wheel tools, etc. It should be understood that the saw or tool of the present subject matter includes one or more of the accessories described herein.

[0118] Fig.36 and Fig.37 An embodiment of a saw assembly 100 according to the present subject matter is shown. The saw assembly 100 includes a body or housing 104 that typically houses a motor 105 and a gearbox 106 that transfers rotational power from the motor to a saw blade 101. A clutch may be optionally provided between the gearbox and the blade. The saw assembly 100 also includes one or more handles 107 for facilitating the user to grip and position the saw 100. The saw assembly 100 also includes a control device for controlling the operation of the saw (e.g., a lock switch that can be in the form of an actuator that is pressed to turn on the motor 105), and a separate button to turn off the motor 105. A variable position trigger switch can be used to adjust the motor speed, thereby adjusting the blade rotation speed. Typical blade speeds range from about 1500 rpm to about 5000 rpm or more. Although saws and tools are typically driven using electric motors, the present subject matter includes the use of pneumatic or hydraulic power sources. The present subject matter also includes tools and assemblies without a gearbox or transmission.

[0119] Fig.36 and Fig.37 Also shown is a saw assembly 100 having the aforementioned receiving hole 102 and recessed cutout 116 of a latch plate 110 (not visible) that engages with a quick connect pin 70 (not shown). The saw assembly 100 is also depicted as including the aforementioned alignment plate 120 that extends into the guide assembly. The saw assembly 100 also includes the aforementioned interlock system 130 (not visible). The saw assembly 100 also includes the aforementioned blade guard system 150 having a front blade guard 152 and a rear blade guard 154. The saw assembly 100 also includes the aforementioned chip management system 160 (not visible). As previously described, the saw assembly 100 is capable of utilizing one or more or all of these features. In a particular version, the saw assembly includes the aforementioned alignment plate, wherein the alignment plate is adapted to engage a guide on the clamp system, and vice versa. The configuration guides the path of the saw by maintaining alignment.

[0120] Fig.38 and Fig.39 Shows Fig.36 and Fig.37 The saw assembly 100. Fig.38 and Fig.39 A saw assembly 100 is shown releasably engaged with the aforementioned clamping system 2 via the clamp and saw coupling assembly 10 . Fig.38 and Fig.39 Also depicted is a clamping system 2 for use in association with the frame assembly 2F. Details of the clamping system and the frame assembly are set forth in U.S. Application No. 16 / 591,753, filed on October 3, 2019. Fig.38 and Fig.39 The clamping system 2 is further shown engaged with the workpiece 4 and saw assembly in the "ready" position. These figures also show the additional features of the aforementioned receiving hole 102 and quick connect pin 70; as well as the alignment plate 120 and its sliding engagement with the slotted guide 90 of the clamping system 2.

[0121] Fig.40 and Fig.41 Shows Fig.38 and 39 The saw assembly 100, the clamping system 2, the frame assembly 2F and the clamp and saw coupling assembly 10, wherein the saw assembly is in an "extended" position relative to the workpiece 4.

[0122] In some embodiments, the tube manufacturing tool is a saw that uses a brushed motor and is connected to an external mains power supply via a cable. In other embodiments, the tool can be used to bevel a tube, cut grooves in the surface of a tube wall, clean or deburr a tube, thread a tube, or otherwise prepare a tube for further use. In other embodiments, the tool can be powered by an integrated or removable battery and use a brushless motor.

[0123] In some embodiments, the tube manufacturing tool includes an electric motor using control electronics and a Hall sensor. In certain embodiments, the electric motor is a brushless direct current (BLDC) motor. In some embodiments, the tube manufacturing tool includes an internal memory and is capable of storing functional parameters such as speed, current value, run time, number of actuations, and related data.

[0124] Many other benefits will no doubt become apparent from future applications and developments of the described technology.

[0125] All patents, applications, standards, and articles mentioned herein are incorporated by reference in their entirety.

[0126] The present subject matter includes all operable combinations of features and aspects described herein. Thus, for example, if one feature is described in association with one embodiment, and another feature is described in association with another embodiment, it should be understood that the present subject matter includes embodiments having combinations of the described features.

[0127] As described above, the present subject matter solves many problems associated with previous strategies, systems and / or devices. However, it should be understood that various changes may be made by those skilled in the art to the details, materials and arrangements of the components described and illustrated herein to explain the essence of the present subject matter without departing from the principles and scope of the claimed subject matter as expressed in the appended claims.

Claims

1. A tube manufacturing tool defining a receiving hole (102), the tube manufacturing tool comprising: Electric motor; A rotating cutting blade (10 1) driven by a motor; A latch plate (110) assembly comprising a positionable latch plate (110) disposed on a tube manufacturing tool; wherein the tube manufacturing tool is used with a clamping system (2) having a quick connect pin (70) extending outwardly from the clamping system (2), wherein once the quick connect pin (70) is inserted into the receiving hole (102), the latch plate (110) engages with the quick connect pin (70); The tube manufacturing tool also includes: An interlock system (130) includes an electrical switch (140) which closes once a quick connect pin (70) is inserted into a receiving hole (102), thereby allowing operation of the tube manufacturing tool.

2. The tube manufacturing tool according to claim 1, wherein: The quick connect pin (70) defines a circumferential groove (78), and once the latch plate (110) is positioned in the engaged position, the latch plate (110) is disposed in the circumferential groove (78) of the quick connect pin (70).

3. The tube manufacturing tool according to claim 2, wherein: The latch plate (110) pivots about a pivot member (112) and is biased toward the interior of the circumferential groove (78) and the receiving hole (102) by a biasing member (114).

4. The tube manufacturing tool according to claim 3, wherein: Once the latch plate (110) is disengaged from the circumferential groove (78), the latch plate (110) can be moved away from the circumferential groove (78).

5. The tube manufacturing tool of claim 1, wherein: The quick connect pin (70) defines a first circumferential region (71) having a first diameter D1, a tapered transition region (75), and a second circumferential region (73) having a second diameter D2, wherein the second diameter D2 is greater than the first diameter D1.

6. The tube manufacturing tool according to claim 5, wherein: The quick connect pin (70) also defines a circumferential groove (78) between the first circumferential region (71) and the second circumferential region (73), and once the latch plate (110) is positioned in the engaged position, the latch plate (110) is disposed in the circumferential groove (78) of the quick connect pin (70).

7. The tube manufacturing tool of claim 5, wherein: The quick connect pin (70) also defines a circumferential groove (78) between the first circumferential region (71) and the tapered transition region (75), and once the latch plate (110) is positioned in the engaged position, the latch plate (110) is disposed in the circumferential groove (78) of the quick connect pin (70).

8. The tube manufacturing tool of claim 1, wherein: The interlock system (130) further includes a positionable paddle (132), and wherein once the quick connect pin (70) is inserted into the receiving hole (102), the positionable paddle (132) is positioned to thereby cause closure of the electrical switch (140).

9. The tube manufacturing tool according to claim 8, wherein: The electrical switch (140) includes a lever contact (142) positionable between an open state and a closed state, wherein the closed state occurs upon insertion of a quick connect pin (70) into a receiving hole (102).

10. The tube manufacturing tool of claim 9, wherein: Once the quick connect pin (70) is inserted into the receiving hole (102), the positionable paddle (132) is moved thereby causing the switch contacts (142) to close and complete the circuit.

11. The tube manufacturing tool of claim 1, wherein: The latch plate (110) defines a concave cutout (116).

12. The tube manufacturing tool of claim 1, further comprising: The housing that holds the electric motor.

13. The tube manufacturing tool of claim 1, further comprising: A gear box (106) transmits rotational power from the motor to the cutting blade (101).

14. The tube manufacturing tool of claim 13, further comprising: A clutch is located between the gear box (106) and the cutting blade (101).

15. The tube manufacturing tool of claim 1, further comprising: At least one handle (107) for holding and positioning the tool.

16. The tube manufacturing tool of claim 1, further comprising: Controls for controlling the operation of the tool.

17. The tube manufacturing tool of claim 1, wherein: The motor is a brushless direct current (BLDC) motor.

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