USRE4917E - Improvement in pipe-tongs - Google Patents

Improvement in pipe-tongs Download PDF

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Publication number
USRE4917E
USRE4917E US RE4917 E USRE4917 E US RE4917E
Authority
US
United States
Prior art keywords
pipe
tongs
jaw
improvement
tooth
Prior art date
Application number
Other languages
English (en)
Inventor
Henry Hebbeet
Publication date

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  • Figure 1 represents a pair of tongs, adapted to chase or cut a screw-threaded pipe.
  • Fig. 2 represents a pair of tongs rigged as a screwwrench.
  • Fig. 3 represents the same, adapted for securely cutting or griping a pipe or for cutting a groove around a pipe for the purpose of severingit.
  • Fig. etre presents adevice whereby the tongs may be adapted to operateon work of diverse diameters.
  • a B represent the two, jaws of a gas-fitters pipe-ton gs.
  • the jawA has a dovetailed socket, a, for the reception of the-various teeth or bits .needed by pipe-fitters.
  • the jaw A is also furnished with an adjusting-screw,-O, to enable the operator to set the bit out or in, as may be required.
  • D is a set-screw, to secure the bit to the place of adjustment.
  • the counter-jaw B has the customary hooked form, to enable it to grasp the pipe on the side opposite to that .on which the jawA engages.
  • One or both jaws are armed with one or more removable bits or teeth of hard steel, which bits project slightly from the face of the jaw, and occupy dovetailed sockets a b b therein. It is manifest that the transverse dovetail slots b b constitute an efficient means of holding bits with any form of external face.
  • the jaw B is traversed by a screw-threaded gauge, F, which, when its point rests in contact with the inner face of the die E, limits the closure of the jaws to correspond with the diameter of the pipe which is being operated upon.
  • a tooth or pin, E or G is made to occupy the socket b or a.
  • the tooth E may project only an eighth of an inch to a thirty-second of an inch above the jaw-face, which, as soon as the pipe touches it prevents further indentation, and thus preserves the pipe from being crushed in case a crushing power is applied.
  • 11' is a graver-pin or tooth, by means of which the operator is enabled tocut around the pipe by a rapid motion of the tool, as a preliminary to severing the pipe at that part.
  • the bits or teeth E G H may be used instead of and in the place of one another, and may come to a point, as in Fig. 3, to a knife-edge, as in Fig. 2, or a serrated edge as in Fig. 1.
  • My bit or tooth being a small piece of caststeel, can be swaged in a suitable die, and be duplicated of precisely uniform shape, size, and hardness, in large numbers, at a small expense.

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