US1435695A

US1435695A - Adjustable tap

Info

Publication number: US1435695A
Application number: US504960A
Authority: US
Inventors: Albert F Breitenstein
Original assignee: GEOMETRIC TOOL CO
Current assignee: GEOMETRIC TOOL CO
Priority date: 1921-10-03
Filing date: 1921-10-03
Publication date: 1922-11-14
Anticipated expiration: 1939-11-14

Description

` 'A. F. B'REITENSTEIN.

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AnJusTAB v APPLICATION FILED OCT. 3.192

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ALBERT IE. BREITENSTEIN, OF NEW HAVEN, CONNECTICUT, ASSGNOR TO THE GEOMETRIC TOOL CO., OF NEW HAVEN, CONNECTICUT, A CORPORATION.

ADJUSTABLE TAP. l

Application filed Octoberl 3, 1921.

' ing at. New Haven, in the county of New Haven and State of Connecticut,ihave in-` vented a new and useful Improvement in Adjustable Taps; and I do hereby declare the following, when taken in connection with the accompanying drawings and the characters of reference marked thereon, to be a full, clear, andexact description of the same, and which said drawings constitute part of this application, and represent, in

Fig. 1 a view in side elevation of my improved adjustable tap.

Fig. 2 a view thereof in front elevation.

Fig. 3 a view thereof in rear elevation.

F ig. 4 a view thereof in central longitudinal section on the line 4 4 of Fig. 2.

Fig. 5 a view thereof on the line 5-5 of Fig. 2.

Fig. 6 a detached View in side elevation of the tapered adj Listing-head, with its diametrically slotted stem.

Fig. 7 a view thereof in front elevation.

F ig. 8 a detached view of the adjusting cross-piece.

My invention relates to an improvement in adjustable taps, the object being to produce a. simple, compact, efcient and durable tap of comparatively few parts and constructed with particular reference to convenience, accuracy and stability of adjustment.

lith these ends in view, my invention consists in an adjustable tap having certain details of construction and combinations of parts as will be hereinafter described and pointed out in the claim.

In carrying out my invention, as herein shown, I employ a tapered adjusting-head 10 having a stem 11 formed with a diametrical slot 12 receiving an adjusting cross-piece 13 connecting the stem 11 and hence the head 10 with an internally-threaded adjustingcollar 14 mounted upon the threaded shoulder 15 of the tap-body 16, which is formed, as' shown, with six centrally intersecting radial slots 17 for the reception of as many dies or chasers 18, the slanting inner edges of which are formed with coupling-slots 19 for the reception of complementary overhanging coupling-ribs 20 formed upon the head 10, whereby the chasers are coupled thereto and held in place thereby, as may be required in the use of the tap or to com- Seliai No. 504,960.

pensate for wear. The overhanging ribs 20 of the head 10 converge from to front to conform to the taper thereof, while the inner edges of the chasers are cut at an angle and grooved to correspond to the .f vpitch of the overhanging ribs 20, as clearly shown.

The adjusting-collar 14 aforesaid is formed with a forwardly extending sleeve 21 reaching over the cross-piece 13 and en- 65 circling the rearportion of the tap-body 16. T he collar proper is formed at four equidlstant. points with s'panner-holes 22, here shown as provided with hardened bushings 23. The inner end of the stem 11 of the 70 f head 10 is formed with a threaded bore 24 for the reception of a screw 25, the head 26 of which lits within the bore 27 of the hollow tap-shank 28. The said screw is encircled by a retracting-spring 29 impinging 75 at its rear end upon the under face of the screw-head 26, and at its' forward end upon a washer 30 resting upon an annular shoulder 31 located in the bore 27 of the shank 28. The outer ends of the slots 17 in the tap- 80 body 16 are closed by means of a cap 32 secured in place by screws 33, whereby the chasers are held against forward displacement.

For locking the adjusting-collar 14 in any 85 position in which it may be set, I employ a bronze shoe 34, set into a. transverse notch in its threaded inner face and jammed upon the threads of the shoulder 15 of the tapbody 16 by means of a set-screw 35, as' shown 90 in Figure 3.

Normally, the tension of the retractingspring 29 will hold the forward end wall of the slot 12 in the stem 11, against the forward edge of the adjusting cross-piece 13, the ends of the rear edge of which are talso held by the spring against the forward face of the collar, as shown in Figure 4, whereby back-lash 1s taken up, and the chasers maintained in accurate predetermined ad.

justment.

If it is desired to compensate for wear or to increase the diameter of the hole threaded by the chasers 18, the set-screw 35 1s' loosened so as to release the adjusting- 105 collar 14, which is now turned clockwise with the effect of positively forcing the adjusting cross-piece 13 forward, and thus positively forcing the head 1() forward, and to that extent expanding the cutting range of the chasers by moving.; them radially outward. TWhen the desired expansion oi the chasers has been effected, the set-screw 35 is' again turned home to bind the adjusting collar 1.4i upon the shoulder 15 of the tapbodyl Reversely, if it is desired, tor any reason, to contract the chasers 18, the collar 14 is loosened and turned counterclock wise, whereby it is moved rearwardly upon the shoulder l5, this rearward movement being accompanied by the concurrent rearward movement of the head l() and stem 11 and adjusting' moss-piece 13 under the pull of' the retracting-spring 29, this operation being also attended by the withdrawal or retraction oi' the chasers 18. The collar let is now again locked by the screw 35. It will thus be seen that by my invention, I am enabled to compensate for wear, as well as to adjust the chasers for Various iits of threads, my device being characterized by the use of an adjusting' cross-piece passing diametrically through the stein of a tapered adjusting-head and controlled by an adjusting-collar7 mounted upon the tap-body.

I claim: Y

n an adj usting tap, the combination with the slotted body and hollow shank thereof, of a tapered adjusting-head provided with a stem having a diametric slot, chasers located in the slots of the said body and coupled with the said head for positive extension and contraction thereby, an adjusting crosspiece passing; through the diametri@ slot in the stem of the head, a collar threaded upon the tap-body and co-a-cting with the said cross-piece ttor positively moving the same and hence the stem and head, forward, and a retracting-spring located within the hollow shank of the tap-body and connected with thel stem of the head for exerting a constant effort to draw the same rearward.

ln testimony whereof, I have signed this specification in the presence of two subseribing witnesses.

ALBERT F. BREITENSTEIN.

lWitnesses G. A. DnNrsoN, JOHN H. H. ALBEN.