US2255361A - Center locating punch - Google Patents
Center locating punch Download PDFInfo
- Publication number
- US2255361A US2255361A US315825A US31582540A US2255361A US 2255361 A US2255361 A US 2255361A US 315825 A US315825 A US 315825A US 31582540 A US31582540 A US 31582540A US 2255361 A US2255361 A US 2255361A
- Authority
- US
- United States
- Prior art keywords
- punch
- sleeve
- main
- center locating
- fitting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25H—WORKSHOP EQUIPMENT, e.g. FOR MARKING-OUT WORK; STORAGE MEANS FOR WORKSHOPS
- B25H7/00—Marking-out or setting-out work
- B25H7/04—Devices, e.g. scribers, for marking
-
- 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
- Y10T408/96—Miscellaneous
Definitions
- This invention relates to means for forming in a body a centering indentation for a drill which must be introduced to working position through a tubular member or fitting which is secured at one end to the body and is open at the other, the object being to assure that the indentation is exactly on the axis of the fitting. It is customary, for example, to weld a T to a main and then to introduce a drill through the T to drill a communicating opening in the wall of the main. I-Ieretofore, there has been considerable difliculty in starting the drill exactly on the line of the T axis. It is such difiiculty which the present invention has as its object to overcome. Preferred means for achieving this object are shown in the accompanying drawing, with reference to which description of the invention will be made.
- Figure 1 is an axial section of a center locating punch in accordance with the invention and of a T to which the punch is operatively applied, a main to which the T is Welded being shown in part in transverse section, and
- Figure 2 is a top or plan view of the new punch.
- reference numeral 5 designates a main to which the cross portion of a T 6 is welded at one end by a fillet l with its axis substantially normal to the wall of the main. At its upper, or outer, open end the T is internally and externally thickened and provided with internal and external threads.
- Reference numeral 8 designates a punch having an elongated cylindrical stem portion 9 provided at one end with an exactly centered point l0 and at the other with a head ll.
- Reference numeral !2 designate a sleeve having a bore in which the stem portion 9 of the punch has a free but close sliding fit so as to be accurately guided for axial movement. At one extremity the sleeve has a portion l3 engageable by a turning tool and for this purpose the portion I3 may be hexagonal, as shown. Beneath portion l3 are three externally threaded portions l4, l5 and iii of stepped-down dilferent diameter, the portion It being of a size to be engaged with the internal threads of the T.
- Portions I 4 and iii are similarly engageable in the threaded portions of appropriately sized Ts.
- the threaded portions l3, I4 and I5, which are, of course, accurately coaxial with the sleeve bore, are respectively surmounted by shoulders I'!, l8 and I9 which are normal to the bore axis.
- the stem ,9 of the punch is somewhat longer than the sleeve bore when, as here shown, the punch includes a head.
- the portion l6 of the sleeve is threaded into the end of the T preferably until shoulder l9 abuts the T end.
- the threads will accurately center the sleeve bore with respect to the T, but in case of worn threads, the shoulder H3, in engagement with the T end, will supplement this function.
- the sleeve With the sleeve thus engaged with the T, it extends a substantial distance toward the main 5. In the present instance, it is shown terminating far enough away from the main so that when the threaded portion M is engaged with a T of larger diameter but of the same length as that shown, the inner end of the sleeve will still be clear of the wall of the main.
- the punch may be introduced and struck to form an indentation in the wall of the main.
- the indentation will be exactly on the axis of the fitting, since the elongated sleeve rigidly positions the punch stem.
- the punch stem as shown, is of substantially smaller diameter than the inner diameter of the T passage, so that the sleeve walls can be made of adequate thickness and yet be spaced somewhat from the inner walls of the T below the interengaged threaded portions.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Description
Sept.-9, 1941. F. H. MUELLER CENTER LOCATING PUNCH Filed Jan. 26, 1940 ll l'llll Patented Sept. 9, 1941 UNITED STATES TENT OFFICE CENTER LOCATING PUNCH Frank H. Mueller, Decatur, IlL, assignor t Mueller 00., Decatur, 111., a corporation of Illinois 1 Claim.
This invention relates to means for forming in a body a centering indentation for a drill which must be introduced to working position through a tubular member or fitting which is secured at one end to the body and is open at the other, the object being to assure that the indentation is exactly on the axis of the fitting. It is customary, for example, to weld a T to a main and then to introduce a drill through the T to drill a communicating opening in the wall of the main. I-Ieretofore, there has been considerable difliculty in starting the drill exactly on the line of the T axis. It is such difiiculty which the present invention has as its object to overcome. Preferred means for achieving this object are shown in the accompanying drawing, with reference to which description of the invention will be made.
In the drawing,
Figure 1 is an axial section of a center locating punch in accordance with the invention and of a T to which the punch is operatively applied, a main to which the T is Welded being shown in part in transverse section, and
Figure 2 is a top or plan view of the new punch.
Referring to the drawing, reference numeral 5 designates a main to which the cross portion of a T 6 is welded at one end by a fillet l with its axis substantially normal to the wall of the main. At its upper, or outer, open end the T is internally and externally thickened and provided with internal and external threads.
Reference numeral 8 designates a punch having an elongated cylindrical stem portion 9 provided at one end with an exactly centered point l0 and at the other with a head ll. Reference numeral !2 designate a sleeve having a bore in which the stem portion 9 of the punch has a free but close sliding fit so as to be accurately guided for axial movement. At one extremity the sleeve has a portion l3 engageable by a turning tool and for this purpose the portion I3 may be hexagonal, as shown. Beneath portion l3 are three externally threaded portions l4, l5 and iii of stepped-down dilferent diameter, the portion It being of a size to be engaged with the internal threads of the T. Portions I 4 and iii are similarly engageable in the threaded portions of appropriately sized Ts. The threaded portions l3, I4 and I5, which are, of course, accurately coaxial with the sleeve bore, are respectively surmounted by shoulders I'!, l8 and I9 which are normal to the bore axis. The stem ,9 of the punch is somewhat longer than the sleeve bore when, as here shown, the punch includes a head.
In the use of the tool in connection with a T of the size shown, the portion l6 of the sleeve is threaded into the end of the T preferably until shoulder l9 abuts the T end. Normally the threads will accurately center the sleeve bore with respect to the T, but in case of worn threads, the shoulder H3, in engagement with the T end, will supplement this function. With the sleeve thus engaged with the T, it extends a substantial distance toward the main 5. In the present instance, it is shown terminating far enough away from the main so that when the threaded portion M is engaged with a T of larger diameter but of the same length as that shown, the inner end of the sleeve will still be clear of the wall of the main. With the sleeve applied as described, the punch may be introduced and struck to form an indentation in the wall of the main. The indentation will be exactly on the axis of the fitting, since the elongated sleeve rigidly positions the punch stem. The punch stem, as shown, is of substantially smaller diameter than the inner diameter of the T passage, so that the sleeve walls can be made of adequate thickness and yet be spaced somewhat from the inner walls of the T below the interengaged threaded portions.
It will be understood that the invention is not limited to the precise details described, and that accordingly I do not limit myself in these respects except as in the following claim.
I claim:
Means for forming in a main to be drilled a drill centering depression on the axis of a tubular fitting which ha one end secured against said main and is open at the other end, said other end being threaded, said means comprising a center punch whose diameter is substantially less than the inner diameter of the fitting, and a sleeve in which said punch has a close sliding fit, said sleeve having a threaded portion engageable with the threaded end of said fitting to position the sleeve coaxially relative to the latter, said sleeve having a portion which when the sleeve is engaged with the fitting extends into adjacency to the main to provide an extended axial guide for said punch, said sleeve constituting the sole guide means for the punch and the punch Being removable with the sleeve from said fiting.
FRANK H. MUELLER.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US315825A US2255361A (en) | 1940-01-26 | 1940-01-26 | Center locating punch |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US315825A US2255361A (en) | 1940-01-26 | 1940-01-26 | Center locating punch |
Publications (1)
Publication Number | Publication Date |
---|---|
US2255361A true US2255361A (en) | 1941-09-09 |
Family
ID=23226222
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US315825A Expired - Lifetime US2255361A (en) | 1940-01-26 | 1940-01-26 | Center locating punch |
Country Status (1)
Country | Link |
---|---|
US (1) | US2255361A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2757024A (en) * | 1953-06-26 | 1956-07-31 | Mueller Co | Machine-inserted service t |
DE954663C (en) * | 1952-10-11 | 1956-12-20 | Licentia Gmbh | Device for marking the mounting holes of control panel devices |
US2860421A (en) * | 1955-07-26 | 1958-11-18 | Joseph J Smith | Self-centering transfer punch |
-
1940
- 1940-01-26 US US315825A patent/US2255361A/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE954663C (en) * | 1952-10-11 | 1956-12-20 | Licentia Gmbh | Device for marking the mounting holes of control panel devices |
US2757024A (en) * | 1953-06-26 | 1956-07-31 | Mueller Co | Machine-inserted service t |
US2860421A (en) * | 1955-07-26 | 1958-11-18 | Joseph J Smith | Self-centering transfer punch |
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