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Publication numberUS83371 A
Publication typeGrant
Publication dateOct 27, 1868
Publication numberUS 83371 A, US 83371A, US-A-83371, US83371 A, US83371A
InventorsWalter K. Foster
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Improved screw-tap
US 83371 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)


' i LenersPatmtNo. 83,371,6mm1 0cb`wr'27,1s6s.


f-w--O-Qo--- The Schedule referred to in these Letters Patent and making part of the Barrie.

To all persons to whom these presents may come:

Be it known that I, WALTER K. FOSTER, of Gambridgeport, of the county ofL Middlesex, and State of Massachusetts, have invented a new and useful Improvement in Serew'laps; and do hereby declare the same to be fully described in the following specification', andrepresented inI the accompanying drawings, of which- Figure l denotes a front elevation,

Figure 2, a vertical section, and

Figure 3, a horizontal and transverse seotionof screw-tap' provided with my improvement. A

In carrying out my invention, I take a cominon screwltap,-A1 and form in it, from its head, and down along in linqof' its axis, or' about so, an oiling-passage, a, from which I lead a hole, b, laterally through the tap to the upper part of one of its series or ranges. c c c c, of screwcutters. I also form in suoh range a groove, d, to ex. tend down therein, fror the said hole, to or nearly to l the bottom of the rang'e.

For the purposes of my invention, the tap may be tubuiar, or be bored through from end to end, in which case I usually insert in -the bore or hole a plug, having its upper end on a level with, or somewhat lbelow, the inner end of the lateral passage b, in order that oil, after having been poured into the upper end of the bore or passage a, may loW through the hole b upon the range of cutters, or into the groove made down therein.

When a screw-tap is so made, or proded with my improvement, it Will be an easy matter to oil its cutters A vvhle it may be in the act of cutting a female screw.

To accomplish this, the lubricating-Hind is to be poured Whatwould be neoessary were the tap unprovided with the improvement.

' An equivalent for the passage a b'would be a single passage, leading from the upper end of the screw-tap obliquelythrough the shank, and out through one of the ranges of cutters.

If desirable, there may be more than one lateral pas sage leading from the main oiling-passage to the outside of the tap. The lateral passage may have a very small diameter in comparison to that of the vertical passage, which may be so large as to constitute a reservoir for holding oil, inI which case, if desirable, a plug may be fixed on the mouth of the passage c, so as to cause the oil to weep from time to time, in a very small quantity,V

from the discharge-passage. The said plug may be a screw, screwed into the top of the oil-receptacle.

What I claim as my invention is- The arrangement of the main and lateral oiling-passages d b, and the groove d, in one of the ranges of screw-cutters, theA Whole being substantially as described.

W. K. FOSTER; Witnesses:

R. H. EDDY, F. P. HA'LE, Jr.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3604035 *Feb 5, 1968Sep 14, 1971Grover Edward HendricksFloating tap and tap holder
US4761844 *Jan 27, 1987Aug 9, 1988Turchan Manuel CCombined hole making and threading tool
US4762444 *Mar 16, 1987Aug 9, 1988Mena Carl MScrew tap with lubrication and extraction bores
US5562371 *Jun 7, 1995Oct 8, 1996Lock-N-Stitch InternationalTap with a non-cutting pilot
US5678962 *Sep 5, 1995Oct 21, 1997Makino Inc.Integral boring and threading tool and method
US5993120 *Apr 13, 1998Nov 30, 1999Sandvik AktiebolagInternal thread-producing tool and method
US6116825 *Feb 6, 1998Sep 12, 2000Kennametal Hertel Ag Werkzeuge + HartstoffeRotating cutting tool with a coolant passage and a method of providing it with coolant
US6210083Feb 11, 2000Apr 3, 2001Dirk KammermeierMethod of providing a cutting tool with lubricating coolant
US6261039Oct 2, 1996Jul 17, 2001Gary Jack ReedThread repair insert
US6293740 *Sep 1, 1999Sep 25, 2001Northern Tool Sales And Service CompanyThreading tool
US6435788Mar 19, 2001Aug 20, 2002Gary Jack ReedThread repair insert
US6439817Mar 19, 2001Aug 27, 2002Gary Jack ReedInsert retention mechanism
US8087854Sep 2, 2009Jan 3, 2012Guehring OhgCutting tool
US8568068 *Sep 2, 2009Oct 29, 2013Guehring OhgRotatably drivable cutting tool
US20020198985 *Oct 19, 2001Dec 26, 2002Noam FraenkelPost-deployment monitoring and analysis of server performance
US20040153833 *Oct 20, 2003Aug 5, 2004International Business Machines Corp.Fault tracing in systems with virtualization layers
US20100086373 *Apr 8, 2010Guehring OhgCutting tool
US20100143055 *Sep 2, 2009Jun 10, 2010Guehring OhgRotably drivable cutting tool
USRE35255 *Jan 21, 1988May 28, 1996Turchan; Manuel C.Combined hole making and threading tool
WO1988006933A1 *Mar 16, 1988Sep 22, 1988Mena Carl MScrew tap with lubrication and extraction bores
Cooperative ClassificationB23B51/06