US171795A - Improvement in taps for cutting screw-threads - Google Patents

Improvement in taps for cutting screw-threads Download PDF

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Publication number
US171795A
US171795A US171795DA US171795A US 171795 A US171795 A US 171795A US 171795D A US171795D A US 171795DA US 171795 A US171795 A US 171795A
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United States
Prior art keywords
taps
threads
improvement
screw
cutting screw
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Expired - Lifetime
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
    • B23G5/00—Thread-cutting tools; Die-heads
    • B23G5/02—Thread-cutting tools; Die-heads without means for adjustment
    • B23G5/06—Taps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/904—Tool or Tool with support with pitch-stabilizing ridge
    • Y10T408/9048—Extending outwardly from tool-axis
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/909—Having peripherally spaced cutting edges
    • Y10T408/9098—Having peripherally spaced cutting edges with means to retain Tool to support
    • Y10T408/90993—Screw driven means

Definitions

  • My invention relates to an improved construction of taps for the purpose of cutting a thread upon the interior of a nut or pipe, to form a female screw 5 and it'consists in the peculiar manner of constructing, combining, and arranging the several parts, as hereinafter described.
  • Figure 1 is side view of my improved screw-tap.
  • Fig. 2 is a longitudinal section of the same, and
  • Fig. 3 is a cross-section on the line w x of Fig. 1.
  • A is the stock or body of the tool. It has a square head, a, of the usual form for turning with the ordinary tap-wrench.
  • the part forming the holder for the cutters B is turned cylindrical or slightly tapering, as shown'in the drawing ate, and adeep channel or groove, 1), is out around it so as to leave a circular flange, e, against. which the inner ends of the 4 cutters B abut. Longitudinally through the part 0. between the groove 12 and the end,-are cut the dovetailed channels 61, into which the cutters B are driven.
  • the slides or cutters B each fit in one of the dovetailed slots d, and when in place are firmly held at the ends from moving longitudinally by the flange e and the screw 0.
  • the cutters B are furnished with portions of a screw thread, and each one is made of the proper angle for cutting in the usual manner.
  • the groove b allows the slots dto be cut entirely through the part c, and leaves the slots clear from end to end.
  • themain body of thetool can be used for a long time, the cut ters only requiring replacing as they areMYL EJ out, thereby saving much trouble andexpense.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Description

.T.J'.-GRAN'1. v I TAPS FOR CUTTING SCREW-THREADS.
v Pa tented Jan.4,1876.
m'zn esses.
"- PETERS, PNO
and
JNITED STATES PATENT OFFICE.
JOHN J. GRANT, OF HARTFORD, 'UONNEOTIGUT, ASSIGNOR TO THE PRATT &
- WHITNEY COMPANY, OF SAME PLACE.
IMPROVEMENT IN TAPS FOR CUTTING SCREW-THREADS.
Specification forming part of Letters Patent No. 171,795 dated January 4, 1876; application iled December 16, 1875.
To all whom it may concern:
Be it known that I, JOHN J. GRANT, of Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Taps for Gutiu g Screw- Threads andIdo hereby declare thefollowin g is a full, clear, and exact description thereof, whereby a person skilled in the art can make and use the same, reference being bad to the accompanying drawing, and to the letters of reference marked thereon.
Like letters in the figures indicate the same parts.
My invention relates to an improved construction of taps for the purpose of cutting a thread upon the interior of a nut or pipe, to form a female screw 5 and it'consists in the peculiar manner of constructing, combining, and arranging the several parts, as hereinafter described.
In the accompanying drawing, Figure 1 is side view of my improved screw-tap. Fig. 2 is a longitudinal section of the same, and Fig. 3 is a cross-section on the line w x of Fig. 1.
A is the stock or body of the tool. It has a square head, a, of the usual form for turning with the ordinary tap-wrench. The part forming the holder for the cutters B is turned cylindrical or slightly tapering, as shown'in the drawing ate, and adeep channel or groove, 1), is out around it so as to leave a circular flange, e, against. which the inner ends of the 4 cutters B abut. Longitudinally through the part 0. between the groove 12 and the end,-are cut the dovetailed channels 61, into which the cutters B are driven. They are held in place by the screw 0, the head of which fits into a circular recess in the end of the part c, andrests upon steps or notches n in the ends of the cutters B. The slides or cutters B each fit in one of the dovetailed slots d, and when in place are firmly held at the ends from moving longitudinally by the flange e and the screw 0. The cutters B are furnished with portions of a screw thread, and each one is made of the proper angle for cutting in the usual manner. The groove b allows the slots dto be cut entirely through the part c, and leaves the slots clear from end to end.
By means of my invention themain body of thetool can be used for a long time, the cut ters only requiring replacing as they areMYL EJ out, thereby saving much trouble andexpense.
What I claim as my invention is The stock A, with its dovetailed slots (1, flange e, and groove 1), in combination with the screw 0 for holding the cutters B, substantially as described.
. JOHN J. GRANT.
Witnesses:
THEO. G. ELLIS, WENDELL R. CURTIS.
US171795D Improvement in taps for cutting screw-threads Expired - Lifetime US171795A (en)

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US171795A true US171795A (en) 1876-01-04

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5480272A (en) * 1994-05-03 1996-01-02 Power House Tool, Inc. Chasing tap with replaceable chasers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5480272A (en) * 1994-05-03 1996-01-02 Power House Tool, Inc. Chasing tap with replaceable chasers

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