Unit for powered wind/unwind of duct rodders

Abstract

An apparatus, method, and system for power unwinding and winding of coiled duct rodding on a duct rodder or other coiled conduit. A unit can be mounted to a duct rodder stand or other coiled conduit stand. The unit includes a rotatable axle having a drive wheel at one end and an opposite end that is adapted for releasable connection to the chuck of a battery powered portable drill or driver. When connected to the drill or driver, the drive wheel can be rotated in opposite directions by the detachable battery powered drill or tool. An optional pinching wheel on the unit can be adjusted relative the drive wheel to provide adjustable pinching pressure on duct rod or other conduit to facilitate movement of duct rodding or other conduit in response to drive wheel rotation. In one example, the drive wheel and pinch wheel are on a frame that can be removably clamped to a stand that supports a cage or reel of coiled duct rodding or other conduit.

Claims

1. An assembly mountable to and along the side of a stand of a duct rodder rotatable cage or reel for coiled duct rodding or other conduit for power assist of unwinding and winding of duct rodding or other conduit comprising: a. a hand portable plate frame having upstream and downstream opposite ends and drive wheel and drill opposite sides along a longitudinal axis, top and bottom opposite edges spaced from the longitudinal axis, and a supporting member along its top edge for structural robustness, the plate frame having perimeter dimensions small enough for a user to carry the hand portable plate; b. a drive wheel having a perimeter diameter rotatably mounted on the drive wheel side and towards the top edge of the plate frame and having a drive axle structurally supported by a steel hub and bushing extending from the drill opposite side and having a distal end for selective operative releasable engagement to a rotary driving output of a hand-operated battery powered drill or rotary tool, the drive wheel perimeter diameter being smaller than the distance between the top and bottom edges of the plate frame; c. an adjustable pinch wheel having a perimeter diameter rotatably mounted on the drive wheel side and towards the bottom edge of the plate frame on an adjustment mechanism that is selectively translatable towards and away from the drive wheel and fixable into position for adjustable pinching force on duct rodding or other conduit relative the drive wheel, the pinch wheel perimeter diameter being smaller than the distance between the top and bottom edges of the plate frame; d. a mounting interface at the upstream end of the plate frame comprising spaced apart clamping plates defining a receiver configured to selectively removably receive and clamp or affix the plate frame with drive and pinch wheels to a stand of a duct rodder rotatable cage or reel for coiled duct rodding or other conduit with adjustable clamping hardware; e. a guide member on the plate frame upstream of the drive wheel comprising an opening configured to threadably receive and guide duct rodding to the drive wheel from the upstream end and generally along the longitudinal axis of the plate frame; f. a guide member on the plate frame downstream of the drive wheel comprising an opening to threadably receive and guide duct rodding from the drive wheel and generally along the longitudinal axis and away from the downstream end of the plate frame; and g. the drive wheel comprises a radially compressible resilient elastic body.

2. The apparatus of claim 1 wherein the guide member upstream of the drive wheel comprises an eye bolt through which duct rodding or other conduit can slidably pass.

3. The apparatus of claim 1 wherein the guide member downstream of the drive wheel comprises an eye bolt through which duct rodding or other conduit can slidably pass.

4. The apparatus of claim 1 wherein the pinching wheel adjustment comprises a swing arm that swings on a tightenable pivot a free end towards or away from the drive wheel.

5. The apparatus of claim 1 wherein the drive wheel comprises: a. a neoprene body; b. a perimeter width of at least an inch; and c. transverse slots through the body.

6. The apparatus of claim 1 in combination with a duct rodder unit comprising a stand and rotatable cage or reel for coiled duct rodding or other conduit.

7. A method of assisting winding and unwinding of a duct rodder unit comprising a stand and rotatable cage or reel for coiled duct rodding or other conduit comprising: a. releasably mounting a hand portable frame to a stand of a duct rodder unit rotatable cage or reel for coiled duct rod or other conduit, wherein the hand portable frame has perimeter dimensions small enough for a user to carry the hand portable plate and comprises: i. a drive wheel; ii. an adjustable pinching wheel that is adjustable as far as closeness to the drive wheel; iii. a mounting interface adapted for selective releasable mounting to a stand of a rotatable cage or reel for duct rodding or other conduit; iv. a guide member on the portable frame upstream of the drive wheel configured to guide duct rodding to the drive wheel; v. a guide member on the portable frame downstream of the drive wheel to guide duct rodding from the drive wheel and frame; and vi. the drive wheel comprises a radially compressible body; b. pinching the duct rodding or other conduit between the drive wheel and the adjustable pinching wheel; and c. rotating the drive wheel with a detachable battery powered drill or rotary tool, wherein the direction of rotation of the drill or rotary tool unwinds or winds the duct rodding or other conduit from or to the duct rodder unit.

8. The method of claim 7 further comprising operating the drive wheel to move the duct rodding or other conduit upstream or downstream relative the drive wheel.

9. The method of claim 7 wherein the drive wheel comprises: a. a steel hub for shaft mounting the drive wheel to an axle; b. a neoprene body mounted on the steel hub, the neoprene body, sidewall openings that allow some compressibility radially, and a soft flat profile perimeter drive surface.

10. A system for power assist of unwinding and winding of duct rodding or other conduit from a stand and rotatable cage or reel for coiled duct rodding or other conduit comprising: a. an assembly adapted for selectively removably clamping or affixing to a stand of a duct rodder rotatable cage or reel for coiled duct rodding or other conduit, the assembly having perimeter dimensions small enough for a user to carry the hand portable plate comprising: i. a hand portable frame including a mounting interface configured for removably mounting to a stand of a duct rodder cage or reel for coiled duct rodding or other conduit; ii. a drive wheel rotatably mounted on the portable frame and having a drive axle adapted for selective releasable operative engagement to rotary output of a battery powered drill or rotary tool, and a radially compressible body with an outer perimeter surface with a width effective to frictionally engage and convey duct rodding or other conduit upon rotation of the drive wheel without damaging the duct rodding or other conduit; iii. a guide member on the portable frame upstream of the drive wheel configured to guide duct rodding to the drive wheel; and iv. a guide member on the portable frame downstream of the drive wheel to guide duct rodding from the drive wheel and frame.

11. The system of claim 10 wherein the drive wheel comprises neoprene.

12. The system of claim 11 wherein the neoprene comprises a plurality of openings.

13. The system of claim 10 in combination with: a. a stand and cage or reel of coiled duct rodding or other coiled conduit; and b. a battery powered hand-operated drill or rotary tool.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIGS. 1A-1E-illustrate a typical duct rodder with hand-pulled duct rod and how it is utilized in practice.

(2) FIGS. 2A-C illustrate attempts to improve mechanical efficiencies of unwinding and winding of duct rodders such as FIG. 1A.

(3) FIGS. 3A-E are pictures of an exemplary embodiment of a powered according to the present invention.

(4) FIGS. 4A and B, 5A and B, 6A and B, 7A and B, and 8A and B are isolated views from FIGS. 3A-E.

(5) FIG. 9 illustrates one example of a drive wheel that can be used in embodiments of the invention.

(6) FIGS. 10A-B are diagrammatic depictions of the exemplary embodiment of FIGS. 3A-E, including showing its operation (how the duct rodding is threaded through the device) and adjustability of the pinching wheel relative the drive wheel for the exemplary embodiment.

(7) FIG. 11 is an isolated 3-D diagram of such operation showing components of the device in isolation from supporting frame.

(8) FIGS. 12A-B and 13 are similar to FIGS. 10A-B and 11, but are an alternative embodiment according to aspects of the invention.

(9) FIGS. 14A-E are illustrations and data regarding an exemplary drive wheel that can be used with embodiments of the invention.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

A. Overview

(10) For a better understanding of the invention, examples of how to make and use the invention are now described in detail. It is to be understood these are for example only and neither inclusive nor exclusive of all forms and embodiments the invention can take.

(11) It is to be understood that the exemplary embodiment uses a commercially-available duct rodder 1 such as that of FIG. 1E, but adds a unit 100 to it to facilitate powered unwinding and winding of the duct rod 3 from that duct rodder unit 1 with a separable portable rotary power source 108. As will be appreciated, this embodiment of the invention could be included as original equipment to a duct rodder. As will be appreciated by those skilled in the art, this embodiment of the invention can be applied in analogous ways to other coiled conduit.

(12) As will also be appreciated, the exemplary embodiment focuses on a duct rodder of the type that has a copper head 5 of FIG. 1E and/or copper internal longitudinal wire of the type of FIG. 1D for purposes of threading the duct rod through an interior bore of a pipe, trench, channel, tunnel, or the like, to assist in locating portions of that run. The invention can be applied, alternatively, to other coiled, elongated rod, cable, wire, or other material the needs to be unwound or wound from a coiled state.

B. Apparatus and Operation of First Exemplary Embodiment

(13) 1. Structure

(14) With specific reference to FIGS. 3A-E, as well as isolated portions from them in FIGS. 4-8 and subparts A and B for each, an exemplary embodiment of a mountable assembly or unit 100 apparatus according to the invention includes a plate frame 102 having a mounting end 104 and an opposite end 105. A drill side 106 is opposite side 107 (see FIG. 6B). As shown in some of these figures, a typical commercially-available battery-powered drill 108 can be attached by hands 202 of a single worker/user 200 at its chuck to a rotatable drive wheel 120 on mountable assembly 100 for unwinding or winding, as discussed below. Drill 108 is shown operatively attached from mountable assembly 100 (its chuck tightened to the rotatable axle of the drive wheel 120 extending from the drill side 106 of plate frame 102 in FIG. 3A. Drill 108 is shown removed from mountable assembly 100 in FIG. 3B. The relatively small form factor of mountable assembly 100 relative to the overall duct rodder 1 can be seem, and how plate frame 102 of exemplary embodiment mountable assembly 100 can be along and close to one side of the cage/reel 8 of duct rodder 1, and not extend outside the diameter of the cage/reel 8 of duct rodder 1 or much away from that side of duct rodder 1 when drill 108 is not attached. Thus, duct rodder 1 can be transported, stored, and operated in basically the same ways as a duct rodder 1 without a mountable assembly 100.

(15) It will also be appreciated that embodiment 100 can be transported and installed by arm(s) 201 and hand(s) 202 of a single worker 200. It can be clamped or otherwise removably attached to stand of duct rodder 1, which usually has structural members that are robust enough to hold a clamped or bolted assembly 100 as well as a cage or reel 8 loaded with duct rodding 3. Assembly 100 can also be made of materials robust enough for the forces it will typically experience in use or transport. In this embodiment, plate frame 102 is made of metal plate (e.g. steel plate). Other materials with sufficient strength and rigidity are possible.

(16) In this embodiment 100, a clamp-type mount 110 at end 104 of plate frame 102 can be simply two parallel plates 112 and 113 defining an open space 114 between. The distal ends of those plates 112 and 113, which are essentially extending transversely from side 107 of plate frame 102, can receive a portion of the stand 9 of a commercially available duct rodder 1 such as FIG. 1E, as well as other typical duct rodders. Bolts 115 can be tightened down to clamp assembly 100 to duct rodder frame 1 in a position that the exit end 105 extends in a direction typical for unwinding and winding of duct rodding 3, and the plate frame 102 is spaced from the cage/reel 8 of the duct rodder 1 so that cage/reel 8 can freely rotate without interferences, as illustrated in FIG. 3A. Other techniques for removably mountable assembly 100 to a duct rodder 1 are possible so long as they allow the components of side 107 of assembly 100 to operate, do not interfere with rotation of cage/reel 108 of duct rodder 1, and allow the duct rodding 3 to be operatively positioned relative to assembly 100 (e.g. unwind and wind from and to cage/reel 108).

(17) A drive wheel 120 is operatively mounted on side 107 of plate frame 107 to an axle 122 that extends from side 106 through plate frame 102. See FIG. 3C. A bushing 124 can help support axle 122 but allow it to rotate at low friction but at high speed. The distal exposed end 126 of axle 122 on drill side 106 of plate frame 102 receives the chuck of drill 108. It can be cylindrical (with or without one or more flattened portions), or it could have facets such as hex, a square, or other for more robust gripping by drill 108.

(18) In this embodiment, one example of drive wheel 120 is available from McMaster.com under part number 2497K15. A specification sheet is at FIGS. 14A-E. The inventor discovered that this size, width, and material characteristics were much more effective at gripping and advancing for unwinding or winding typical fiberglass duct rod 3 than hard rubber non-pneumatic wheels, or even pneumatic wheels such as shown in FIG. 2C. The invention is not necessarily limited to that particular wheel, however. FIGS. 14A-E and FIG. 9 provides details about the particulars of this specific drive wheel.

(19) For example, as can be seen at FIG. 9, this type of wheel is not solid but is neoprene (polychloroprene) with spaced apart, tear-drop shaped through openings between opposite wheel sides that are all at a similar or same oblique angle to the wheel rotational axis. A center axially opening includes a tapped hub of steel with two radial set screws that can fix the wheel to a shaft or stud such as drive axle 122 discussed above. The soft surface (35A durometer) and the tear-drop oblique openings allows the wheel to gently grab and maintain contact as it is compressed to prevent slippage of a variety of materials, including fiberglass rodding. The outer surface of fiberglass duct rodding can be fiberglass or some coating (non-limiting examples include paint or PVC). Neoprene can give effective gripping of these and other surfaces including metal and plastics. Oil-resistant neoprene is a synthetic rubber generally stronger and harder than natural rubber and more resistant to water, oils, and solvents, and retains its properties over a temperature range from well-below freezing to well-above one hundred degrees F. This example has a diameter of four inches and a width at perimeter surface of close to two inches. This width accommodates the diameters of typical duct rodding, which can range from around 18 inch to inch. The hub has an inside diameter of inch which thus is complementary to a wide variety of battery-powered drills or drivers.

(20) As can be seen from FIGS. 14A-E, wheel 120 can be commercially purchased with the foregoing properties in different form factors and durometers according to need or desire.

(21) 2. Operation

(22) Operation of mountable assembly 100 discussed above is as follows. As illustrated at FIGS. 10A and B, a pinching wheel 130 is disposed under drive wheel 120 on the free end of a pivot arm 134 bolted to plate frame 102 at bolt 135. In this example, pinch wheel 130 is underneath drive wheel 120. By loosening bolt 135 slightly, swinging arm 134 can be swung down around the axis of bolt 135 (see downward direction of arrow 136) sufficiently to allow the diameter of duct rodding 3 to be easily threaded between, or inserted sideways between, drive wheel 120 and pinching wheel 130. By then swinging arm 134 upward along arc 136 of FIG. 10A until pinching wheel 130 comes into contact with the lower side of duct rodding 3 and brings the upper side of duct rodding 3 into abutment with the lower side of drive wheel 120, and then tightening bolt 135 sufficiently to hold arm 134 in that position, the pinching force of pinching wheel 130 one side of rodding 3, and the drive wheel 120 on the other side of rodding 3, promotes sufficient friction of rodding 3 and drive wheel 120 to move rodding 3 in the direction of rotation of drive wheel 120. See, e.g., FIG. 3B, which shows how a single user 200 with a wrench can reach under and around unit 100 when mounted on duct rodder 1, loosen bolt 135, rotate arm 134 up until pinches rodding 3 to the underside of drive wheel 120, and then re-tighten bolt 135. Bolt 135 can either be in a tapped aperture in plate 102 or simply have a welded or free nut on the opposite side of plate 102 to allow bolt 135 to be tightened to clamp arm 134 against side of plate assembly 102. Bolt 135 can be tightened or loosened with a common wrench quickly and easily. Once the duct rod 3 is positioned between drive wheel 120 and pinching wheel 130, the pinching force against drive wheel 120 can be adjusted according to need or desire. Pinch wheel 130 is rotatable on bolt 132 which is fixed to arm 134. This combination allows user adjustability for best performance of unwinding and winding, different sizes and materials of duct rodding 3, and other variables such as weather conditions or the like.

(23) For example, as discussed above, for a drive wheel 120 made of neoprene with tear-drop oblique openings as shown in FIG. 9, pinching wheel 130 can be moved up against rodding 3 and drive wheel 120 with sufficient manual force to not only bring all three into abutment but compress drive wheel 120 at least some. By then tightening bolt 135 to fix arm 134 at least generally in that position, there can be added grabbing and maintaining contact of drive wheel 120 as it is compressed to prevent slippage of rodding 3 during rotation of drive wheel 120. By empirical techniques, including trial and error, the best pinching pressure for a given application can be fine-tuned by the user by this simple loosening of bolt 135, selecting the amount of upward swinging of arm 134 for a given pinching pressure, and a quick tightening of bolt 135. Optionally, materials other than neoprene that have some elasticity and resiliency, could be used. They could optionally include openings through the sidewalls to provide some additional compressibility of drive wheel 120 when brought into abutment with duct rodding and/or a pincher wheel or other mechanical backstop opposite the duct rodding or conduit. The number, form factor, size, and orientation of those openings could vary.

(24) Pinching wheel 130 can be made of a variety of materials, including that of drive wheel 120 or other materials so long as it can exert sufficient up-pressure on duct rodding 3 to pinch duct rodding against the underside of drive wheel 120 to allow the gripping force of drive wheel 120 to move the duct rodding 3 out from reel 1 or back into reel 1. As such, pinching wheel May be of a solid natural or synthetic rubber, or a plastic or metal or other material. As will be appreciated by those skilled in this technical area, the amount of pinching force of pincher wheel 130 can be adjusted by the user/operator according to need or desire. Sometimes more pinching force is needed for effective grip and unreeling or reeling in of duct rodding 3; sometimes less is needed. This can depend on a number of factors including but not limited to the length of the duct rodding to by unreeled or reeled in, the diameter and material of the duct rodding 3, the resistance of the reel 1 to rotation, the weather conditions (which can affect slipperiness of the exterior of the duct rodding 3 or resistance to rotation of the reel with the duct rodding).

(25) As will be appreciated by those skilled in the art, alternatives to pincher wheel 130 are possible, as are use without a pincher wheel 130 or similar. For example, simply a mechanical stop member (e.g. a flat or rounded metal member), instead of a rotating wheel 130, could be on arm 134, and converged towards drive wheel 120 to pinch rodding or conduit 3 against drive wheel 120. That stop member could be a surface of the arm 134 itself. The surface could be made low friction by the nature of the surface (e.g. polished metal) or by some low-friction coating. Still further, instead of a pivoting arm 134, adjustable convergence of some type of pinching member (wheel 130 or some mechanical stop) could be achieving by other structure. One non-limiting example would be a sliding member that could be slid towards and away from drive wheel 120 and fixed into any position along that path. One example could be a slot (linear or curved) machined into plate 102 and the pinching member carried on a bolt that can be loosened or tightened to move, when loosened, the bolt in the slot towards or away from drive wheel 120 and fix it in position, when the bolt is sufficiently tightened. Other techniques are possible.

(26) Additionally, the pinching component, whether arm and wheel 134/130 or otherwise, could be above drive wheel 120, and be adjustable towards and away from the top of drive wheel 120, with rodding or conduit 3 positioned over the top of drive wheel 120.

(27) Also, drive wheel 120 might be adjustable towards and away from a fixed pincher wheel 130 or other pinching structure. It could be on a pivoting arm like arm 134 or otherwise adjustable and fixable into a final operating position.

(28) Still further, another embodiment of the mountable assembly 100 could just have drive wheel 120 and not use any pincher wheel 130. The conduit could be threaded over the top of drive wheel 120 and gravity help frictional contact between the two. Drive wheel might include larger diameter edges than its middle to help retain rodding or conduit 3 in place. They could be separate plates sandwiched on opposite sides of a cylindrical drive wheel 120, or built into wheel 120.

(29) As will be appreciated, at a minimum, the mountable assembly 100 has the ability to mount to a stand of a duct rodder or other coiled conduit stand, and include a drive wheel effective to engage and unwind from or wind to the duct rodding or conduit from its cage or reel by friction between the drive wheel and the rodding or conduit, where an interface provides the ability for powered rotation of the drive wheel by a portable rotary tool, such as a drill or driver. As will be appreciated, in its most basic form, that interface could allow any of a variety of rotary tools to be used, including battery powered tools but also corded tools that could be plugged into an available electrical power source. There could be electrical generators available. Recently, many motor vehicles include on-board plug-in DC or AC electrical power out (either from vehicle batteries or on-board electrical converters or generators. However, as will be appreciated by those skilled in the art, it can be very beneficial to use a portable, hand-operated battery-powered, conventional rotary drive unit like a drill or driver.

(30) In this embodiment, two guide wheels 142 and 144 are downstream from drive wheel 120 and pincher wheel 130. As indicated, wheels 142 and 144 have grooves 143 and 145 respectively that can ensure guidance of duct rod 3 therebetween. Both wheels are rotatable on bolts or axles that are attached to plate frame 102. These are not required but can improve smoothness of operation.

(31) In this embodiment, on the upstream side from drive wheel 120, a guide 150 for duct rod is bolted to a plate frame 102. In this example guide 150 is simply an eye-bolt. This helps facilitate feeding of duct rod 3 to drive wheel 120 and pincher wheel 130. Obviously, other guides that provide a feeding guide to drive wheel 120 is possible. Such a guide is not required but can be beneficial.

(32) The material for plate frame 102 can vary. In this example, it is steel. In this example, a supporting member along its top edge at right angles to the longitudinal axis of the plate provides additional robustness.

(33) Guide wheels 142 and 144 can be metal, plastic, or other materials.

(34) With additional reference to FIGS. 10A and B in FIG. 11, methods and methods of use according to the invention are illustrated. These methods are in the context of exemplary embodiment 100, as mentioned, but the precise form and configuration of the apparatus could vary according to need or desire.

(35) As discussed above, to prepare unit 100 for operation, once unit 100 has been mounted to a duct rodder 1 in a fixed manner to duct rodder frame 9, pivot arm 134 can be loosened and dropped to drop pinch roller away from drive wheel 120. Duct rodding 3 can be threaded through eye-bolt 150 (or similar structure), under drive wheel 120, and through guide wheels 142 and 144. Swing arm 134 can be pulled up to pinch duct rod 3 to the underside of drive wheel 120. Swing arm 134 can be tightened at that position. As further mentioned, the operator can, with little effort and quickly, fine-tune the amount of pinching to need or desire.

(36) Then, to provide powered assist to unit 100, electric battery drill or driver 108 can be brought to the exposed axle 122 on unit 100 and have the drill's chuck tightened on drive axle 122 on the opposite side of plate frame 102. Rotation of the chuck of drill 108 in either direction facilitates rotation of drive wheel 120, which influences movement of duct rod 3 for unwinding from duct rodder 1 from unwinding or winding onto it. Through easy and intuitive operation of a conventional tool such as a battery-powered drill or driver, the user can control direction, amount, and speed of unwinding and winding for any desired period of time or multiple periods of time. The user has manual and precise control by simply operating the drill or tool 108.

(37) The inventor has tested and confirmed that commercial grade battery powered drills such as are available from a variety of manufacturers in fully charged condition can unwind substantially all of a typical coil of duct rod 3 and wind it back in. Obviously, an additional advantage of this embodiment of the invention is that even if the battery power drill 108 does lose charge to not be effective, a battery can be replaced, or another battery power driver switched in to immediately continue.

(38) It can therefore be seen that the invention achieves a least one or more of its objects, features, aspects, and advantages. As can be seen, basically a mountable assembly 100 less than the diameter of duct rodder frame 9, elongated along its horizontal diameter can be fixed to frame 9. The duct rodding 3 can be threaded through assembly 100 quickly and easily. Assembly 100 can be adjusted for optimal performance for given conditions. Assembly 100 uses noncomplex mechanical principles with a subtle utilization of a specific drive wheel 120 and pinching wheel to take advantage of a separate, portable, hand sized power source.

(39) Additional features can be beneficial including guide wheels on the downstream side of drive wheel 120, and a guide member on the upstream side, but are not necessarily required.

(40) Mountable assembly 100 is robust, will withstand harsh environmental outdoor conditions, and can easily be repaired or replaced.

(41) FIGS. 3A-E, 4A-B, 5A-B, 6A-B, 7A-B, and 8A-B are additional views of the combination of unit 100 on a duct rodder 1, including certain viewing angles and specific portions that are shown both on duct rodder 1 and then either enlarged or isolated, to give additional information about how to make and use unit 100 on a duct rodder 1 according to one non-limiting specific embodiment.

(42) As can be seen, this embodiment 1 achieves one or more of the stated aspects according to the invention. Unit 100 is relatively small and unobtrusive along the side of duct rodder 1 when mounted. It can be added and removed. It does not carry its own power source but rather has the important but subtle benefit of being powered by a separate portable battery-powered tool.

(43) That tool needs to be attached only when duct rodding 3 needs to be unwound or wound onto the cage/reel 8 of duct rodder 1, but can easily and quickly be removed and, if needed, used for other tasks.

C. Apparatus and Operation of Second Exemplary Embodiment

(44) With particular reference to FIGS. 12A-B and 13, an alternative embodiment mountable assembly or unit 100 according to aspects of the invention is illustrated. It is similar to the First Embodiment of FIGS. 10A-B and 11 with the following main difference.

(45) Instead of exit guide wheels 142 and 144 of FIGS. 10A-B and 11, an eye hook 151 is mounted on frame 102 on its downstream end 105, and guides the downstream end of duct rod 3 to and from that end 105, and aligns duct rod 3 with drive and pincher wheels 120 and 130. Eye hook 151 can have a threaded end that allows a nut to fasten it to frame 102. As will be appreciated other ways to guide duct rod 3, both at frame end 105 and frame end 104, are possible.

(46) As can be seen, this embodiment 2 achieves one or more of the stated aspects according to the invention. Unit 100 is relatively small and unobtrusive along the side of duct rodder 1 when mounted. It can be added and removed. It does not carry its own power source but rather has the important but subtle benefit of being powered by a separate portable battery-powered tool. That tool needs to be attached only when duct rodding 3 needs to be unwound or wound onto the cage/reel 8 of duct rodder 1, but can easily and quickly be removed and, if needed, used for other tasks.

D. Other Options and Alternatives

(47) It will be appreciated by those skilled in the art that variations to the exemplary embodiments are possible and that the exemplary embodiments are not limiting of the forms and embodiments the invention can take.

(48) Below are some non-limiting examples.

(49) 1. Form Factor/Scale

(50) As will be appreciated by those skilled in the art, the form factor (shape/size) can vary according to need or desire. The exemplary embodiments 1 and 2 illustrate one non-limiting form factor and scale that is effective for a range of typical duct rodders 1. But variations of form factor and scale are possible.

(51) The exemplary embodiments 1 and 2 illustrate one non-limiting form factor and scale that would be effective for other types of conduit than duct rodding, so long as the diameter is smaller than the perimeter width of the drive wheel 120.

(52) There may be some upper limit on the size of conduit that can be serviced by the invention. That possible upper limit may relate to limits on power on battery-powered drills or drivers. However, as is well-known to those skilled in the art, those power limits are quite high given the improvements in torque and battery life for such tools, including with professional grade portable battery-powered rotary tools.

(53) 2. Conduits

(54) As mentioned, the exemplary embodiments are discussed principally in the context of duct rodders and duct rodding of fiberglass, but one or more aspects of the invention can be applied in analogous ways to other coiled conduit. Variations obvious to those skilled in the art might be needed for some other conduit depending on its diameter, outer surface, flexibility, and mass. Any coiled conduit that can be fed from or onto a reel or cage may benefit from one or more aspects of the invention.

(55) 3. Materials

(56) As mentioned, the materials used for components of unit 100 can vary according to desire or need.