US2389548A

US2389548A - Tap

Info

Publication number: US2389548A
Application number: US528919A
Authority: US
Inventors: Joseph A E Romanoski
Original assignee: Individual
Current assignee: Individual
Priority date: 1944-03-31
Filing date: 1944-03-31
Publication date: 1945-11-20
Anticipated expiration: 1962-11-20

Description

19:45 J. A. E. ROMANOSKI 2,389,548

TAP

Filed March 31, 1944 Inventor Patented Nov. 20, 1945 UNITED STATES PATENT OFFICE TAP Joseph A. E. Romanoski, Huntington, N. Y.

Application March 31, 1944, Serial No. 528,919

1 Claim.

My invention relates to improvements in taps, the principal object in view being to equip the usual tap with a detachable pilot of simple, practical form and whereby in hand tapping the tap may be started and then' withdrawn and the pilot detached so as not to obstruct tapping of blind holes to the bottom thereof.

Other and subordinate objects are also comprehended by my invention, all of which, together with the precise nature of my improvements, will be readily understood when the ucceeding description and claim are read with reference to the drawing accompanying and forming "part of this specification.

In said drawing:

Figure 1 is a view partly in longitudinal section and partly in elevation illustrating a tap equipped according to my invention, and

Fi ure 2 is a view in perspective of the parts of the tap detached,

Referring to the drawing by numerals, according to my invention, the usual tap I with the wrenchor tool engaging end 2 is provided with an axial bore 3 extending inwardly from the leading end of the tap for a suitable distance beyond the threading portion 4 of the tap. The bore 3 is designed to receive with a sliding fit a, pilot spindle 5 designed to extend to the inner end of the bore 3 and to project out of the same for a substantial distance. An Allen type of set screw 6 threaded into the tap I radially beyond the threadingportion 4 of the tap is designed to hear I against a, flattened portion 1 of the spindle 5 adjacent the butt end of the latter and lock said spindle 5 in the bore 3. A pilot sleeve 8 is fitted over the extending portion of the spindle 5 and detachably secured thereto by an Allen type of set screw 9 threaded radially into said sleeve and bearing against a flattened portion l0 in the spindle 5 adjacent its outer end.

The manner in which the described invention is designed to be used will be readily understood. In hand tapping a blind hole, the tapping operation is started with the described pilot attached to the tap, it being understood that the pilot sleeve 8 is of the roper diameter as compared to that The tap l is then withdrawn, the

of the hole. pilot sleeve 8 detached from the spindle 5 by removing the Allen screw 9, and the pilot spindle 5 detached from the tap by removing the Allen screw 6. The tap is then reinserted in the hole and the tapping operation completed.

The foregoing will, it is believed, suffice to impart a clear understanding of my invention without further explanation.

Manifestly, the invention, as described, is susceptible of modification without departing from the inventive concept, and right is herein reserved to such modifications as fall within the scope of the appended claim.

What I claim is:

A tap having a threaded end portion and an axial bore extending therein from the leading end thereof and past said portion, a pilot spindle removably inserted in said bore and having an outer end extending out of the same, and a pilot member detachably attached to said end, and a set screw extending into said tap in the rear of said portion and engaging said spindle.

JOSEPH A. E. ROMANOSKI.