Tapping T for plastic pipe
AssigneeDresser Industries, Inc.
InventorThomas Pessia
Life of this patent
Estimating the term…
Abstract
A tapping T for effecting a house outlet connection on non-metallic plastic pipe. A tapping tool is threadedly supported in the body of a tapping T service connector adapted for mounting on a pipe main under pressure. The cutting nose of the tool is secured on a plastic head and is comprised of a smooth, thin wall circularly tubular sleeve the radial end facing of which is serially stepped axially inward in a repetitively controlled pattern of sequential relief about its periphery. To cut a slug or coupon, the cutting nose via the head is threadedly advanced into the pipe wall while a screw extending centrally outward of the cutting nose aids in retaining the cut coupon within the open bore of the sleeve.
Claims10
In a tapping T for non-metallic plastic pipe including a threaded main body portion defining an axis of rotation, wrench engaging means formed on one end of said body and an at least substantially continuous circularly tubular metallic cutting nose at the other end of said body, the improvement comprising an end face on said cutting nose having a generally blunt cutting edge with a planar portion normal to said axis extending substantially throughout the cutting nose and operatively adapted to effect pipe wall penetration throughout its at least substantially continuous periphery, said end face in a circumferentially continuous direction having successively stepped portions axially relieved from said planar portion in a repetitive control pattern about the periphery thereof.
In a tapping T for non-metallic plastic pipe including a threaded main body portion defining an axis of rotation, wrench engaging means formed on one end of said body and a substantially continuous circularly tubular metallic cutting nose at the other end of said body, the improvement comprising an end face on said cutting nose including a plurality of teeth extending axially forwardmost thereon circumferentially displaced about the periphery thereof, said end face in a circumferentially continuous direction being successively stepped progressively in the same axial direction in a repetitive control pattern of sequential relief about said periphery defined on said end face in the circumferential displacement between said teeth, said control pattern comprising a first axially inward relief step defined by an axial shoulder on a tooth of said teeth and a second axially inward relief step defined circumferentially intermediate adjacent of said teeth.
Dependencies are inferred from the claim text.