US1664851A - Tool post - Google Patents

Description

April 3, 1928. v v 1,664,851

G. M. CLASS TOOL POST ed Aug. 1926 2 Sheets-Sheer 1 5/ O J 55 5 J2 i K 1; 12 I $2 5 10- 3 Q7 22 19 29 22' 26 JTzI- QJZZOW: Geor gzM Class April 3, 1928.

TOOL POST Filed Aug. 18- 1925 a l 2 Sheets-Sheet 2 Jill/6775 14 J3 Gzo jgajfi (YZLS 5 2, w Jm 1,664,851 e. M. CLASS Patented Apr. 3, 1928o V UNITED STATES.

PATENT OFFICE.

GEORGE M. CLASS, OE. MADISON, WISCONSIN, ASSIGNOR TO GISHOL'I. MAOHINE COM- PANY, OF'MADISON, WISCONSIN, A CORPORATION OF WISCONSIN.

'roor.

Application August 18, 1926-. Serial No. 129,885.

This invention relates to tool posts 'for lathes and other machine tools employing tool posts, andhas reference more particularly to' tool posts of the turret type capable of holding a plurality of tools and of being indexed to bring the latter successively into operative relation to the work. A The main object of the present invention is to provide a very simple, inexpensive and eflicient tool post, in which, by swinging a handle lever through an angle slightly greater post will be indexed and clamped. 'Another object is to provide an improved and simplified ,mechanism for unlocking the tool holder when the latter is to be indexed.

In the accompanying drawings I have illustrated the invention as embodied in a square turret tool post designed to be in dexed through an angle of ninety degrees but it will be understood, of course, that the invention is equally applicable to tool posts designed to be indexed through greater or less angles. V I 7 Referring to the drawings- 3 Fig. 1 is a top plan view;

Fig. 2 is a vertical section line 2+2 of Fig. 1;

Fig. 3 is a horizontal section taken on the talien on the a line a-a of Fig. 2;

Fig. 4 is an elevation; and J Figs. 5 and 6 aredetailperspective views of a rotatable sleeve through which the retracting movements of the locking bolt are efiected.

Referrin to the drawings, 10 designates the base 0 the tool post that is helddown on the cross-slide 11 '(Fig. 4) by bolts 12 and nuts 13, which latter are adjustable in the usual T-slots 14 of the cross-slide. The

ofthe base 10 is circular,

upper portion 10' the tool holder body and mounted thereon is 15 equipped with the usual lateral flange 15' 1 carrying screws 16 by which the tools are clamped on the wedges 17. Extendingcoaxiall through the base 10 and body 15 is a stu 18 that is formed with a threadedlower end 19, a threaded upper end 20, and an enlarged central portion 21. On the threaded lower end 19 of the stud is a nut 22 adapted to move'into clamping and-release engagement with the bottom of the than the indexing angle, the tool base, as hereinafter described, and pinned to the upper threaded end 20 of the stud is an operating arm 23. The tool holder body 15 is furthercentered and revolubly guided on the base by a circular flange 24 on its lower end embracing the circular upper portion 10' of the base.

Referring to Fig. 2, mounted in the base 10 is a bushing 25 in which is slidablymounted a locking bolt 26 chambered in its lower portion to house a thrust sprin 27 by which it is normally pressed upward y into one of a series of sockets 26' formed at spaced intervals in the bottom of the tool holder 15. The spring 27 is footed on a pin 28 that is mounted in a lug 22 formed as a lateral extension of the clam ing nut 22. The nut 22 is also formedwit a vertical slot 29 that accommodates a lateral projection or foot 30 formed on the locking bolt 26.

Encircling the stud 18 below its central enlarged portion 21 is a rotatable sleeve 31, shown in isometric detail in Figs. 5 and 6 Said sleeve has a circumferential bearin in the bore of the base 10 and is con ed against any substantial end pla downwardly by the hut 22 and upwardly y co-operating annular shoulders 32- and 33 on the sleeve 31 and its bearing in the base 10, respectively. -The lower end-of the sleeve 31 is formed to provide a plurality of spaced with the foot of the lockingbolt to hold the latter retracted during the indexing movement of the tool holder.

The sleeve 31 is turned in one direction only; of the sleeve .isformed with a plurality of ratchet teeth 38, these teeth co-operatin'g and for this purpose the upper end with a pawl 39 that is mounted to slide vertically in a hole in the enlarged portion 21 of the stud 18. The'pawl 39 is pressed downwardly into oo-operating en agement with theratchet by a spring 40. ss'uming that the lower end of the'pawl 39 is in'conpermit the locking bolt to re-engage with the next socket in the tool holder;

Similar pawl and ratchet .mechanism is preferably employed to transmit the turning movement of the stud 18 to the tool holder; this last-named pawl and ratchet mechanism being timed to operatein immediate succession to the operation of the bolt retracting mechanism, so that the tool holder may be unlocked, then indexed to a new position, and automatically relocked by a single continuous movement in one direc tion of the operating arm or lever 23. 'The mechanism for turning the tool holder is best shown in Fig. 3, wherein it will be seen that the bore of the tool holder which forms in part a bearing for. the enlarged portion 21 of the stud is formed with a plurality of spaced ratchet teeth 41, which, for greater durability are preferably formed in hardened steel pins 42 non-rotatably fitted into .seats in the tool holder body. Co-operating with the ratchet teeth 41 is a pawl 43 that is slidable horizontally in a transverse hole in the stud section 21 and urged outwardly by a spring 44. The operation has been for the most part'set forth in the fore oing de scription of the structure, but may e briefly outlined as follows.

The bolt retracting cams 36 being, in the instance shown, about thirty degrees long the first thirty degrees of swinging movement of the arm 23 in a counterclockwise direction efiects the retraction of the bolt. At that point the pawl 43 comes into engagement with one of the ratchet teeth 41; and the continued swing of the arm 23 in the same direction through another ninety de grees efiects the indexing of the tool holder to a new position, at which point the foot of the locking bolt drops into another notch 34 of the cam sleeve and the bolt simultaneously engages with the next socket of the tool holder andthus locking the latter in its newly indexed position. When the operating arm is reversed through the same are as its forward movement, the nut 22 is drawn u tight-against the base 10 clamping the whole post rigidly together, and the pawls 39 and 43 snap back into position again as the operating arm is reversed, ready to effect the next unlocking and indexingmovement of the post. If more than ninety degrees is to be indexed at one time, by moving the opformed on itslower-end with a lateral erating arm sufliciently to withdraw the locking bolt, and then moving the tool holder the rest of the way by hand, and then reversing the arm the tool post may be clamped in any position. A 1 a I claim- 1. In a tool post,the combination of a base, an upwardly springressed locking bolt in said base formed wit a lateral rojection, a tool holder rotatable on said ase having sockets in its under side to interlock with the upper end of said bolt, a rotatable stud extending centrally through said base and tool holder, said stud formed with an enlarged intermediate portion, an operating arm fast on the upper end of said stud, a

rotatable sleeve encircling said stud beneath said arm in the same direction after said bolt has been retracted.

2. In a tool post, the combination of a base, an upwardly spr 1ngpressed locking bolt in said base formed with a lateral rojection, a tool holder rotatable on said ase having sockets in its under side to interlock with the upper end of said bolt and internal ratchet teeth, a rotatable stud extending centrally through said base and tool holder,

said stud formed with an enlarged interme-' portion embraced by the upper porsaid base and the lower portion of diate tion 0 said tool holder, an operating arm fast on the upper end of said stud, a rotatable sleeve encircling said stud beneath said enlarged portion, said sleeve formed on its lower end with. cams cooperating with said projection to retract said bolt, pawl and ratchet means carried by said enlarged portion andthe upper end of said sleeve for turning the latter,

and a horizontally slidable ring-pressed pawl mounted in said enlarge portioncooperating with the internal ratchet teeth of said tool holder to index the latter by a continued movement of said arm in the same direction after said bolt has been retracted.

3. In a tool ,post, the combination of a base, an" upwardly' spring-pressed locking bolt eccentrically' mounted in said base and rojection, a tool holder-rotatable onsaid base having sockets in its under side to interlock with the upper end of said bolt, a rotatable stud extending centrally through said baseand tool holder, an operating arm fast on the upper end of said'stud, a nut on the lower end of said stud adapted for clampiiao ing engagement with said base, cooperating sleeve for turning the latter, and pawl and means carried by said locking bolt and nut ratchet means carried b said stud and tool for locking the latter against turning, a roholder operative to in ex the latter by 9.

tatable sleeve encircling said stud formed on continued movement of said am in the same 5 its lower end with cams coogzrating with direction after said bolt has been retracted.

said projectionto retract'said lt, pawl and ratchet means carried by said stud and GEORGE M. CLASS.

Images