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Publication numberUS1209139 A
Publication typeGrant
Publication dateDec 19, 1916
Filing dateSep 10, 1915
Priority dateSep 10, 1915
Publication numberUS 1209139 A, US 1209139A, US-A-1209139, US1209139 A, US1209139A
InventorsWilliam H Gates
Original AssigneeWilliam H Gates
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Collapsible tap.
US 1209139 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)


COLLAPSIBLE HP. Arrucmon mm an. 10. ms.

Patented Doc. 19, 1916.



v-| m1 nunIrmn-mu mum-nu I r WILLIAM H. GATES, OF NEW HAVEN, CONNECTICUT.


Sp..c1flcation of Letters Patent.

Patented Dec. 19, 1916.

Application filed September 10,-1915. Serial N 0. 49,896.

To all whom it may concern:

Be it known that I, WILmAu H. Ga'rns, a citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut, have invented certain new and useful Improvements in Collapsible Taps: and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to makes and use the same.

My invention relates to collapsible taps and it consists in certain details of construction to be more fully set forth in the followin" specification.

\eferring to the drawings.

Figure 1 re resents a broken view )artly in section of the head, its shank, and s iding shell on line 1, 1 of Fig. 3, showing the threadin r dies in operative position; I ig. 2 is a broken view artly in section of the head, its shank, an sliding shell on line 2, 2 of Fig. 3, showin the threading dies in operative position; I ig. 3 is a front elevation of the tool with the front late removed; Fig. 4 is a broken sectional view of the sliding shell on line 4 of Fig. 2, showing the tri lever mechanism in its normal closed posltion; Fig. 5 is a view similar to Fig. 4, but showin the position of the tri lever when the slit mg shell is released; Fig. 6 is a detail view of one of the threading dies Fig. 7 is a detail view of one of the cam olts; Fig. 8 is a detail view of one of the studs for actuating the cam bolts; Fig. 9 is a broken view part] in section of the tool showing the threading dies colla sod; Fig. 10 is a section on line 10, 10 of Fig. 9; Figs. 11, 12, 13 and 14 are detail views of the sliding shell locking mechanism.

The body of the tap comprises the end 1 carryin the threading dies 2, 3, 4 and 5 the enlarge portion 6 and the shank 7, which latter is adapted to enter a rotatable turret headnot shown. The dies are mounted to have a radial movement in the slots 8 formed in the forward end 1 of the tap bod and they are held in workable position herein by the plate 9, which plate 1s held in place by suitable screws, one of which, 10, is shown in Fig. 2. In Fi 3 are shown the threaded holes 11 for sai screws.

The threading bits or dies are actuated to open and close throuh the medium of the bolts 12, which bolts iave a longitudinally reciprocating movement in the holes 18 formed in the body of the tap. On the forward ends of these bolts are formed the cams 14, Fig. 7. Cam grooves-one of which, 15, is clearly shown in Fig. 6are formed in the cutting face of each die to receive the cam projections of said bolts. The cam bolts are actuated through the medium of the studs 16 anchored in the sliding shell 17 and are additionally secured therein by the pins 18 shown in Figs. 1 and8. The forward end of each of these studs 16 is provided with the hook portion 19. Fig. 8, adapted to engage the notch 20 in the rear end of each cam holt as shown in Figs. 1, 9 and 7. In order to employ the same method of actuating dies for internal threading to open and close through the medium of longitudinally operating cam members carried by a sliding shell, as applied to dies for external threading, it was found necessary to employ additional members like, for instance, the studs 16 to actuate the cam members or bolts 12, as said bolts, in order to actuate the dies, must necessarily be located so far within the body of the tap as to render it im ossible to connect them directly to the slicing shell. The shell 17 is slidablv mounted on the shank 7, and its forward end is recessed to also embrace the enlarged portion 6 of the body of the tap. The mechanism for automatically locking the shell in its advanced position and releasing the same is the same as shown in the intent granted to me on August 3, 1915, 0. 1,148,510. A brief descrlption of this mechanism Will be necessary to show its connection with the present construction. The locking member 21, Fig. 14, is operativol located in the recess 22, Fig. 2, of the tap ody and is outwardly actuated by the spring 23. 24-see also Figs. 12 and 13-is a disk rotatably inserted in the shell 17 and maintained therein by the indicator dial 25-shown also in Fig. 11. The under side of the disk 24 is provided with the cam recess 26 adapted to receive the upper end 27, Fig. 14, of the locking member.

The cam pin 28, Figs. 2, 4 and 5, is journaled in the rear wall of the shell 17 and is embraced by the trip lever 29 and is socured thereto by the in 30. This lever is located and adapte to operate in the recess 31 of the sliding shell. The reduced portion 32 of the cam pin 28 enters the recase 38 of the locking member 21 so that, when the tool has advanced the proper distance, a trip-mot shown-will enga e the projecting end of the trip lever 29 am turn the same into the position shown in Fig. 5. This movement of the trip lever will depress the locking member 21 and carry it out of the cam recess 26 and thus release the sliding shell 17, which is then forced rearward by the s rings 34. This return movement of the S1011 carries with it the studs 16 and sliding cam bolts 12, and the return of the cam bolts will draw the threading dies inward and thus release the cutting operation. The turret will then withdraw the tap body from the work. Immediately after the release of the shell, the flat spring will return the trip lever 29 to its normal position shown in Fig. 4. To disengage the dies from the cam bolts and remove them from the tap after the front plate 9 is removed, the cut away or relief 36, Fig. 6, is made to enable the dies to draw all? freelyin the direction of arrow a, Fi 9-from the cam projection 14 of the bot 12. As the o erative travel of this cam projection is on y from a to b, Fig. 6, 1t is quite evident that the dies could not be removed or entered were the cam slot of uniform width. The inner end of the stop pin 37, Fig. 2, carried by the shell 17, travels in the groove 38, formed in the shank 7, to limit the outward travel of the shell.

live cents each,

Having thus described my invention, what I claim is:

1. A tap bod threading dies romovably located therein lia faces, sliding bolts havim cams to register with the cam grooves of the dies, a sliding shell embracing the tap body, means for locking the same thereto and unlocking it therefrom, and members carried by the shell to engage with said bolts and actuate tlhe same to open and close the threading les.

2. A tap body, threading dies removably located therein having cam grooves in their faces, longitudinally operating cam members adapted to register with the cam grooves of the dies, said tap body having an enlarged portion and a shank portion, a sliding shell embracing said shank and enlarged part of the tap body means for locking the same to said enlarged portion of the tap body and unlocking it t erefrom, and members carried by the shell to engage with said cam member to actuate them to open and close a the threading dies.

In testimony whereof I aiiix my signature in presence of two witnesses.

WILLIAM H. GATES. Witnesses:

JOHN G. Evans, Tnno. E. HOPPEN.

by addressing the Commissioner of Patents,

Washington, D. 0."

ving cam grooves in than

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4712951 *Aug 26, 1985Dec 15, 1987Brown Byron LTool for cutting annular groove
U.S. Classification408/149, 470/203, 408/158
Cooperative ClassificationB23G5/12