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Publication numberUS58924 A
Publication typeGrant
Publication dateOct 16, 1866
Publication numberUS 58924 A, US 58924A, US-A-58924, US58924 A, US58924A
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Improvement in tube-sheet cutters
US 58924 A
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Description  (OCR text may contain errors)




Specification forming part of Letters Patent No. 68,924, dated October 1G, 1866.

To all whom it may concern:

Be it known that I, TnEoDoRE L. WEB- STER, of Brooklyn, in the county of Kings and State of New York, have invented a certain new and useful Improvement in Tube-Sheet Gutters for Steam-Boilers; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this speeitication, and to the letters of reference marked thereon.

By the ordinary method of preparing the tube-sheets of steam-boilers for the reception of the tubes, after the sheets are laid out with lines that intersect at the points corresponding with the intended centers of the tubes, the centers are first marked with a punch, small holes are then drilled through the plate, and the plate is finally bored to the sive required with a pin or teat drill. The first small holes are required for the stcadiment of the teatdrill, making the larger holes for the tubes.

The object ot" my invention is to dispense with that portion of the labor hitherto required for the drilling of the preliminary small holes; and it is accomplished by means of a tool that lnay be centered in the center-punch or prick-punch markings, where it is held steadily while the holes for the reception of the tubes are being bored through the plate by the advance of the critters.

To attain this end my invention consists ot' a new arrangement of a circular cutter and spring-center, by which the circular head forming the cutter is titted to the tool-stock with a lantern -jcint, and the spring center works within the stock, and is retained by a key working in a slot.

When the center is placed in a center-punch marking, the drill may be fed down to the plate and passed through it, while the center Aremains in the marking and holds the cutter securely, the spring yielding gradually as the boring and the feeding progresses.

To enable others skilled inthe arts to which it appertains to make and use myinvention, I will proceed to describe its construction and operation with reference to the drawings.

Figure l is an outside view of the said improved tool, and Fig. 2 is a longitudinal sec tion, and Fig. 3 an end view ofthe same.

The socket a may be fitted to a machine in the usual manner. It carries a circular cutter, b, which is secured by the. lantern lock-pin e. rlhis lock corresponds with the direction of the cutting'edges ot' the cutter, so that it remains fastened when the drill is being used or being withdrawn, and may be readily untastcned by simply turning it back when it is required to remove the cutter.

rlhe center d is retained in the socket by the key c, that works in a suitable slot, and it is pressed outward bythe spring f, which should have suth'eient force to resist any tendency to lateral displacement. When the tool is pressed toward a sheet to be drilled the spring yields, and the center rl remains in the center-punch marking, while the cutter advances and passes through the sheet.

By means, therefore, ofthe yielding center, in combination with the circular cutter, a circular disk may be cut at once from the sheet, instead of first drilling a small hole, and then cutting away all the rest ofthe metal with an ordinary pin-drill. A single socket may bc fitted with several sizes of cutters made with offsets as may be required.

I claim- As an article of manufacture, a tool for drillA ing metals, composed ot' a circular cutter and a yielding center, constructed and arranged in the manner described.



Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2543861 *Feb 12, 1948Mar 6, 1951Mader Harry JPlug insert bit for core drills
US2556240 *Aug 2, 1945Jun 12, 1951Lichtman Joseph ZRotary cutting tool
US2923180 *Dec 14, 1956Feb 2, 1960Newport News S & D CoInsulation cutting tool
US2931262 *Jan 8, 1957Apr 5, 1960Harry M ErwinTool for cutting circular grooves
US3162067 *Nov 23, 1962Dec 22, 1964Black & Decker Mfg CoHole saw
US3262474 *Mar 11, 1964Jul 26, 1966BlackHole saw assembly
US4193721 *Jan 18, 1979Mar 18, 1980Hougen Everett DArbor for annular hole cutter
US4297059 *Aug 6, 1979Oct 27, 1981Masaaki MiyanagaApparatus for forming holes in plate glass
US5816752 *Jan 31, 1997Oct 6, 1998Benjamin; Darin L.Knock out device
US7237291 *Aug 23, 2004Jul 3, 2007Henry RedfordCombined nut recess cleaner and nut driver tool
US20100278601 *Dec 8, 2008Nov 4, 2010Andrew Mark BeynonCutting Apparatus
Cooperative ClassificationB23B51/05