Coupon-retaining drill bit

General Pipe Working Tools. Mechanical Hot Tapping Machines. Catalog No. Buy Now. Review It! Please select from 1 star up to 5 stars in the chart below, 5 stars being the best.

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1/4 Reed Pilot Drill Bit Carbide Tipped (99129)

Click Here to Unsubscribe. Need Help? I agree that Reed may store and process this information to assist with my inquiry. We will not share your information with any third party unless it is necessary to assist in the resolution of your inquiry. The operation of the pilot drill 46 is illustrated in FIGS. The pilot drill 46 will penetrate the wall of the main 24 before the hole saw 40 does. This has the advantage of first providing a limited area for fluid communication between the pressurized fluid in the main 24 and the internal volume of the SIMTAP and ball valve assembly, allowing pressures to equalize before the hole saw completes the cutting of the larger hole in the main When the pilot drill 46 penetrates the main 24 , centrifugal force on regions 60 of the wire through the end of the pilot drill 46 causes the wire ends to sling outward as shown in FIGS.

In this position, coupon 62 , once cut free of the main 24 , cannot fall into the main, as it cannot slide past the side regions of wire 60 , the wire being limited in further rotation by abutment with ends 56 FIG. In the preferred embodiment, the hardened inserts form the stop. Consequently, coupon 62 is positively retained with respect to the pilot drill 46 and will always be removed from the main 24 and retracted through the ball valve as shaft 36 is withdrawn to its outermost position.

In that regard, while the hand drill can be left running during this withdrawal, it has been found that the coupon is always retained, even if the hand drill is shut off during the withdrawal, thereby preventing the coupon from falling into the main 24 , or for that matter into the ball valve, which would also cause problems. The preferred embodiment of the present invention has been disclosed and described with respect to its use with respect to a SIMTAP drilling machine for hot tapping mains, though the pilot drill of the present invention may be readily used with other hot tapping machines, or in other drilling apparatus or other applications where coupon retention is preferred or required, as desired.

Similarly, the coupon retention mechanism may take other forms than the simple bent wire of the preferred embodiment. By way of example, in place of the relatively rigid wire member 58 of the preferred embodiment, some form of spring actuated member or members could be used which would elastically fit within the hole formed by the pilot drill 46 , though spring outward once through the hole to prevent the coupon 62 from falling off the end of the pilot drill For instance, wire member 58 may readily be sized to provide such a spring action by its own elasticity, the same being dimensioned so as to have a free state distance between tips of sides 60 intentionally greater than the diameter of the hole drilled by the pilot drill These and other positive coupon retainers, either operative by gravity or centrifugal force, or spring loaded, are within the present invention, though the simple, relatively rigid wire of the preferred embodiment is in fact preferred because of its simplicity, its ruggedness and because it has been found to positively retain the coupon each and every time.

Similarly, a conventional drill, such as a tool steel drill without carbide inserts could be used as desired, particularly for drilling into plastic mains. Thus while various embodiments of the present invention have been described herein, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.


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A pilot drill bit comprising: a shank having a driving end for attachment to a drill driver and a cutting end having a cutting edge thereon, the cutting edge being sized to drill a hole of selected diameter through a workpiece;. The pilot drill bit of claim 1 wherein the movable retaining finger fits within the cutting diameter of the cutting edge when in the first position by a spring action, and extends to a position where a portion thereof lies outside the cutting diameter under influence of the spring action.

The pilot drill bit of claim 1 wherein the movable retaining finger freely deflects to the first position fitting within the cutting diameter of the cutting edge and the second position where a portion thereof lies outside the cutting diameter.


  1. Specifications:;
  2. RIDGID Coupon Retaining Pilot 3/8" for RIDGID RT Tapping To – My Tool Store;
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  6. The pilot drill bit of claim 1 wherein the movable finger is a U-shaped finger having two arms, at least one of which extends outward from the diameter when in the second position. The pilot drill bit of claim 4 wherein the pilot drill bit has a hole approximately perpendicular to an axis of the pilot drill bit, the U-shaped finger being disposed through the hole.

    The pilot drill bit of claim 1 wherein the retaining finger is U-shaped and has two arms, the arms lying substantially parallel to each other and both arms lying within the diameter in the first position and lying partly outside the diameter in the second position. The pilot drill bit of claim 6 wherein the pilot drill bit has a hole approximately perpendicular to an axis of the pilot drill bit, the U-shaped finger being disposed through the hole.

    Retainer Wire Install into our Pilot Drill Bits for Hot Tapping Pipe

    The pilot frill bit of claim 7 wherein the pilot drill bit is configured to allow the arms to point away from the cutting edge when in the first position, and to prevent the arms from rotating so far toward the cutting edge as to again fit within the diameter.

    The pilot drill bit of claim 8 wherein the retaining finger is bent wire shaped to a U-shaped configuration. The pilot drill bit of claim 9 wherein each cutting edge has at least one hard insert secured to the shank of the drill bit, the insert defining the diameter of the hole that will be cut by the pilot drill bit.

    CRPD25 | Mechanical Hot Tapping Machines - Drill Bits - Reed Manufacturing

    The pilot drill bit of claim 1 wherein there is a shoulder on the drill shank adjacent the cutting edge, the shoulder acting as a stop to stop the retaining finger in the second position. A drill bit comprising: a shank having an engagement end to be engaged to rotate the drill bit and a drilling end, a cutting insert of hard material attached to the drilling end, the cutting insert defining the diameter of a hole which can be cut by the drill bit;. The drill bit of claim 12 wherein there is a shoulder on the drill shank, the shoulder being positioned to stop the finger from moving past the second position.

    The drill bit of claim 12 wherein the shoulder is formed by the cutting insert. The drill bit of claim 12 wherein a hole is formed through the shank adjacent the drilling insert and the retaining finger is movably mounted in the hole.

    The drill bit of claim 15 wherein the retaining finger is U-shaped and has first and second arms, one on each end of the hole, the arms lying in the first position during drilling and extending to the second position when drilling is complete. The drill bit of claim 16 wherein the drilling insert is positioned so that the retaining finger engages against the drilling insert as a stop in the second position. A drill bit comprising: a shank having an engagement end to be engaged for rotating the drill bit and a drilling end;.

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    The drill bit of claim 18 wherein the engagement end of the drill bit has a flat thereon. The drill bit of claim 18 wherein the wire is a substantially rigid wire. The drill bit of claim 18 wherein the wire is a flexible wire, and fits within the diameter of a hole to be drilled by the drill bit by elasticity of the wire. The drill bit of claim 18 further comprising a shaft, the drill bit being mounted on one end of the shaft and concentric with the shaft, the shaft having mounted thereon a hole saw concentric with the drill bit, the drilling end of the drill bit extending out from the hole saw so that the wire will extend through a hole drilled by the drill bit and move to the second position before the hole saw cuts a coupon from a workpiece, the wire preventing the coupon from unintentionally coming off the drill bit.

    The drill bit of claim 22 wherein the shaft, drill bit and hole saw are coupled to a hot tapping machine, the wire preventing the coupon from unintentionally coming off the drill bit after drilling through a service main. USB2 en. USB1 en. Apparatus for hole-making in an elongated, tubular body, and method of use of the apparatus. Apparatus for moving an element into and from a vessel containing fluid under pressure.


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