US2522315A

US2522315A - Automatic undercutting and grooving tool

Info

Publication number: US2522315A
Application number: US759350A
Authority: US
Inventors: Aaron A Staat
Original assignee: Individual
Current assignee: Individual
Priority date: 1947-07-07
Filing date: 1947-07-07
Publication date: 1950-09-12
Anticipated expiration: 1967-09-12

Description

Sept. 12, 1950 A. A. STAAT l AUTOMATIC UNDERCUTTING AND GROOVING TOOL 2 Sheets-Sheet 1 Filed July '1'. 1947 Harm gli? ATTE RN EYB sept. 12, 195o A. A. STAATA AUTOMATIC UNDERCUTTING AND GROOVING TOOL 2 Sheets-Shexet 2 Filed July 7, 1947 INV EN TOR.

ATI'D R N EYB Patented Sept. 12, `1.950

AUTOMATIC UNDERCUTTING cRoovING TOOL c Aaron A.v staat, Covington, Ky! y Application Jiiiyj, 1947,"seria1 Ners'asto 2 claims.

(c1. s252441) fv This invention relates to an automatic undercutting and lgrooving tool.

It is an object of the presentv invention` 'to provide a grooving tool adapted to be' attached to the head of a lathe or screw machine'which upon making abutment with the end of the work being grooved or undercutk automatically causes the inward movement ofthe cutters for eiecting the operation and'whereupon at the end of the Work operation an outward movement of the work will release'the cutters and cause their return to their open positions. f

Otherj objects of the present invention are to provide an automatic undercutting and grooving tool which is of simple construction, inexpensive to manufacture and eiicient in operation.

For other objects and for a better understanding of the invention, reference may be had to the :following detailed description taken in connection with the accompanying drawing, in which Fig. 1 is a side elevational view of the tool with the cutters about to be extended upon the work to effect the cutting operation.

Fig. 2 is an end elevational view of the tool.

Fig. 3 is a longitudinal cross-sectional view of the tool taken generally on line 3-3 of Fig. 2.

Fig. 4 is a fragmentary and cross-sectional view taken in another plane and on line 4-4 of Fig. 2.

Fig. 5 is a transverse cross-sectional View taken on line 5--5 of Fig. 1.

Fig. 6 is a longitudinal cross-sectional view taken through the operating mechanism for the cutters.

v Fig. 7 is a transverse cross-sectional view taken through the operating mechanism and on line 1-1 of Fig. 1. l

Referring now to the figures, I5 represents a spindle adapted to be inserted in a chuck of a lathe or screw machine. This spindle has a projection I6 of less diameter and providing for a shoulder I1. Within the projection I6 is a central opening I8 in which there is extended a projection I9 of a plug 20 having a tapered surface 2I thereon. Ahead of the tapered surface 2| is a cylindrical projection 22 extended into a thrust plate 23 engaging with a thrust lbearing 24. Surrounding the projection I6 and ing 26.y Upon releasing the screw 29 ,the element 28'car1 be relieved andthe casting 2li can be removed from the projection I6 of the spindle. Accordingly the casting 26 is laxially adjustable (inthe projection` I6. vWithin the casting are springs 3| abutting ajcollar l32 secured over the o shoulder I1 of .the spindle I5. These springs will urge the` vcasting 2B forwardly as shown in Fig. 1. When `the thrust plate 23engages the end of a workpiece 33, the springs 3| will be compressed and .the casting will be ,adjusted rearwardly to the position shown in Fig. 3.I`

On the front face of the casting 26 are mounted radially adjustable toolholders 34 which are normally urgedv outwardlyby springs 35. A tool element or'cutting element 36 is slidable in the tool holders and is adapted to be depressed radially inwardly against the action of spring 35 by a. lever 31 pivoted at 38 to the casting 26. On the opposite end of the lever 31 is an adjusting screw 39 adapted to engage outer end of an operating member 4I within radially extending openings which is moved by the inward movement of the casting and the engagement of the operating element 4I with the tapered surface 2Il of the plug 20. A cylindrical shield 42 is secured to the collar 32 and extends over the exterior surface of the casting whereby to keep dirt from entering the space between the casting and the collar 32.

The plug 20 is retained within the projection I6 of the spindle by a set screw '43. Operating element 4I has a set collar 44 to prevent or limit the inward displacement of theA operating element 4I. The holders 34 are retained on the casting 26 by bolts 45, Fig. 7. The cutter 36 is retained in the holder by a guide plate 46.

In operation, the thrust plate 23 will engage the end of the work and the casting will be moved rearwardly on the projection I6. As this happens the operating elements 4I will be raised upon the tapered portion 2I of the plug and moved outwardly to engage the adjusting screws 39 on levers 31. The opposite end of the lever 31 will bear against the top of the cutter 36 and cause the inward movement of the same into the work, whereby to cut a groove 48 in the work piece. The cutters are accordingly moved in- 'wardly automatically as the work is brought against the thrustplate 23. When the groove 48 has nally been cut, the pressure on the work piece can be released and the cutter 36 will be automatically retracted from the work piece. The casting 26 will be returned to its forward most position by the springs 3I. The operating said spindle and mounted for axial adjustmenti thereon, resilient means for urging said casting forwardly of said spindle, means =connected-to said spindle providing a tapered surface,fthere=' being a plurality of radially extending openings arranged in said casting, an operating element slidably arranged in each of .said-radiallyextend-V ing openings and adapted to frictionally engage said tapered surface for controlling the inward and outward movement of said operating elements, meanson the casting forengagingthe end of a work piece to cause the axialA adjustment of said casting inwardly andthereby cause-movement of said operating elements, a plurality-of cutters pivotally mounted on said casting and adapted to engage said work` piece, means operatively connecting said-cutters to-said operating elements to cause movement of said cutters as the casting is moved axially on saidspindle, and an adjustingscrew-operatively connected 'to vsaid last named means for engagementwth said-'operating elements for regulating thev cutting depth ofthe cutters.

2. In an automatic vun'dercutting and grooving tool, a spindle, a casting operativelyconne'cted'- to 4 said spindle and mounted for axial adjustment thereon, resilient means embodying a plurality of coil springs for urging said casting forwardly of said spindle, means embodying a plug connected to said spindle providing a tapered surface, there being a plurality of radially extending openings arranged in said casting, an operating element vslidably arranged in each of saidradially extend- `zing'openings,and adaptedto frictionally engage said tapered surface for controlling the inward Vand outward movement of said operating elements, meanson said casting for engaging the end :.of.awork `pieceto cause the axial adjustment of said casting inwardly to thereby cause movementoffsaid operating elements, a plurality of cutters mounted .on said casting and adapted to engage-said workpiece, means embodying levers operatively connecting said cutters to said operating elements to cause movement of said cuttersas the casting is moved.axiallyonsaidspindle, and an adjusting screw operatively iconnected to saidlast namedmeans. for engagement with said operating elements for regulating vvthe cutting depth of Ithe'lcutters.

AARON .A. STAA'I..4

`REFERENCES CTED The followingreferenoes are of record in the le of this patent:

UNITED STATES PATENTS Number Name- DateA 739,501 Meyers v vsept. 22,1903 2,348,186 Bashore May 9, 1944 2,349,159 Freeman 1 May Y16, 1944