US1872817A

US1872817A - Means for cutting grooves in bushings

Info

Publication number: US1872817A
Application number: US480543A
Authority: US
Inventors: Harry F Root
Original assignee: ARTHUR C HALLER
Current assignee: ARTHUR C HALLER
Priority date: 1930-09-08
Filing date: 1930-09-08
Publication date: 1932-08-23
Anticipated expiration: 1949-08-23

Description

Aug. 2a, 1932 H. r. mm- 1,872,817 I IIMIS F 0! CUTTING GROOVIS '1 BUSHIIGS mu sm. 8. 1950 4 Shuts-Shut 1 I 'IIMIS l'OR CUTTING GROOVE-S IN BUSB IIIQS 4 Shoots-Shoot 2 Filed Sept. 8. 1930 QQY Aug. 23, 1932, H. F. ROOT BANS FOR CUTTING GROOVES IN BUSHINGS 4 Sheets-Sheet v 3 Filed Sept. 8. 19:50

v 25 zz Aug. 23, 1932. r H. F. ROOT 1,372,817

' IEANS FOR CUTTING GROOVES IN BUSflINGS Filed Sept. 8. 1930 4 Sheets-Sheet 4 Patented Aug. 23, 1932 UNITED STATES PATENT OFFICE may I. BOOT, or BUFFALO, NEW 1031:, assieuoa or ONE-THIRD *ro imam c.

EALLEB, OF BUFFALO, NEW YORK m8 FOB CUTTING GROOVESIN- BUSHINGS Application filed September a, 1930. Serial No. 480,548.

This invention has for its object the provision of a simple and eflicient device whereby oil grooves may be formed in the bores of bushings rapidly and efiiciently with minimum labor. The invention provides a device which may be set in the turret of a lathe and manipulated without the application ofhigh power to quickl form the groovesand which may be set to b ject and other objects which will'appear in the course of the following description are attained in such a device as is illustrated in the accompanying'dra'wings andthe in vention resides in certain novel features which will be particularly pointed out in the appended claims.

In the accompanying drawings Figure 1 is a front elevation of a turret lathe having thegi-oove cutting device mounted therein. I v 'j Figure 2 isan enlarged'top plan view of the device set in a turret lathe; I Figure 3 is an enlarged end "view of the device. i

Figure 4 is line 4-4 of Figure 3. a

Figure 5 is a detail section onthe'line 55 of Figure 3. v I

Figure 6 is a sideelevation of the body of the groove cutting device with parts broken away and parts in section. 1

I Figures 7 and 8 are detail views illustrating different adjustments of the guide which determines the length and position of the cut.

Figure 9 is a detail section of the cutter.

Figures 10, 11 and 12 are detail sectional views showing difi'erent forms of grooves which may be produced by the device ofthe invention. I

The turret lathe shown at 1 may be of any approved design and includes a turret 2 and collet or chuck 3, the collet or chuck receiving the bushing 4 in which the groove is to be cut and securing the bushing in the well known manner. In actual practice, any convenient form of stop may be inserted in the collet or chuck to form an abutment for the bushing so that all the bushings will project from the chuck the same distance and, consequently, the grooves will be formed ore tapers. The stated ob-' a'longitudi'nal section on the therein uniformly. The device of the invention comprises a body including a relatively stationary member 5 and a relatively slidable member 6, the relatively stationary member having mounted upon its outer side a plate 7 '55 from which a shank 8 extends to be engaged in any one of the openings in the turret 2 and held therein. The body member 5 hasa rib 9-formed centrally and longitudinally on its outer face and the plate 7 is oonstructed with 21 central longitudinal groove to fit slidably over the rib, as will be understood upon reference to Figures 2 and 3, the plate having longitudinal slots 10 formed therein through which bolts 11 are inserted to be en- 05 gaged in selected o enings 12 ,formed in the body member 5 whereby the plate-will be firmly secured in position, washers '13 being fitted about the bolts under the heads of the same, as'shown in Figures 2 and 3. Sliding adjustment of the device" may be-etfected so as to attain the proper relation between the cutter and the bushing by loosening the bolts 11 and then sliding the body member 5 along the plate 7, after which the bolts are again turned home, the washers 13 servin to bridge the slots 10 so that the heads 0 the bolts will exert a: clamping action upon the washers and the plateto bind the same firmly in the set position against the body member 5. Thebody member 6 is constructed with a longitudinal dove-tail groove in its side presented to the body member 5 and said member 5 has a dove-tail rib 14 formed on its coacting face or side to engage in said groove, as shown in Figure 3, a gib 15 being disposed at one edge of the rib and the corresponding sidewall of the groove so as to attain the desired close sliding fit. A plurality of set screws 16 are mounted in the upper side of the body member 6 to ass through the same and bear upon the gi 15 to compensate for wear and maintain the engagementbetween the giband the rib 14. Lock nuts 17 are mounted upon the set screws 16 and are turned home against the body member 6 to maintain the adjustment in an obvious manner. Semi-circular bores, indicated at 18 and 19,are formed in the opposed surfaces of the

body members

5 and 6 so as to register and house a tension spring 20 which acts constantly to move the

members

5 and 6 longitudinally relative to each other. One end of the coiled spring is fitted about a centering stud or plug 21 which is set in the adjacent end of the bore formed by the grooves 18 and-19 and has a head 22 against which the end of the spring abuts, a screw 23 being formed on the outer end of the head and extending through and being threaded in a plate 24 which is secured to the end of the body member 5. By adjusting the screw 23 in the plate 24 the desired tension may be imparted to the spring and a lock nut 25- mounted upon the screw will be turned home against the plate 24 so as to hold the screw in the adjusted position. The plate 24 is secured to the body member 5 by screws 26 inserted through the plate into the ends of the body member and an adjusting set screw 27 is fitted loosely through the plate 24 and engaged in a threaded socket 28 provided therefor in the end of the body member 6. as will be understood upon reference to Figure 4. The screw 27 works in opposition to the spring 20 and by rotating the screw the body member 6 may be adjusted relative to the body member 5 to position the cam, as will presently appear. The end of the spring 20 remote from the centering stud 21 is engaged over a similar stud 29 which is an integral part of a plug 30 seated in the opposite end of the bore formed by the

grooves

18 and 19 and said plug 30 is a part of a cam carrying plate 31 which is secured to the adjacent end of the body member 6 by screws orthe like. Disposed centrally upon the cam carrier 31 are vertically spaced lugs or ears 32 between which is pivotally mounted a cam 33 which is a substantially triangular block having one corner disposed in approximate alinement with the center of the plug 30 and said corner is normally pressed outwardly by a small expansion spring 34 seated in cor responding sockets provided therefor in the opposed surfaces of the cam and the cam carrier plate or plug. The cam 33 is designed to coact with a cam guide 35 which is mounted upon the cross slide carriage 36 of the lathe and comprises a shank or stem 37 which is secured to and supported by the back'tool post 38 of the lathe, the front end of the shank or stem being recessed to provide a seat for the guide 35 upon which the guide is held by a set screw 39. At the back end of the seat or recess in the front end of the stem 37 is a cross bar 40 formed integral with the stem and having set screws 41 mounted in its ends to bear against the back edge of the cam guide 35. By loosening the set screw 39 the guide may be adjusted pivotally upon its seat through manipulation of the set bolts 41, in an obvious manner, and the guide may then be held in the set position by turning the set screw 39 home.

Difl'erent adjustments of the guide are illustrated in Figures 7 and 8 of the drawings.

On its side remote from the body member 5, a boss or socket 42 is formed on the body member 6 and this boss or socket receives one end of a boring bar 43 which is held in the socket by a set screw 44 mounted in the upper side of the same, as shown in Figure 3. The end of the boring bar 43 is formed with an axially extending threaded bore, indicated at 45, and with a transverse o ening 46 intersecting the inner end of sai bore, as shown in Figure 9. A cutter or bit 47 is seated in the opening 46 and is held therein by a set screw 48 mounted in the bore 45, also as shown in Figure 9.

The construction and arrangement 'of the several parts of the ap aratus having been thus made known, it is t ought the operation will be readily understood. The groove cutting device is mounted in the turret by engagement of the shank 8 in any one of the openings of the turret, as has been stated, and the stem 37 with the guide 35 is adjusted so that if the device he moved toward the chuck or collet 3, the projecting corner of the cam 33 will ride on the front edge of said guide, the spring 34 bein compressed during this movement so that t e cam will be held by the guide and may move easil The bushing is secured in the chuck or collet 3 and the cross slide of the lathe is adjusted so as to bring the boring bar 3 into alinementwith the bore of the bushing, after which the turret is moved along the bedof the lathe so that the boring bar and the cutter will enter the bore of the bushing and roduce the desired cut. If the boring bar and cutter do not enter the bore of the bushing with just sufiicient clearance to avoid interference, the bolts 11 are loosened and the body member 5 is then shifted just enough to enable the cutter to clear the end of the bushing and enter the bore of the same, after which the bolts are turned home. The body member 6 will, of course, move with the body member 5 and thereby set the boring bar in proper relation to the bushing. The handle on the cross carriage is then rotated so that the pressure of the cam against the cam guide Wlll cause the cutter 47 to slightly penetrate the wall of the bushing, the cam guide 35 being set so as to have the desired contact with the projecting corner of the cam 33. The turret is then caused to travel along the body of the lathe so that the cutter will be pushed inwardly within the bushing and will make an initial cut for the groove. When the out has been made to the desired length, the turret is retracted, the cutting mechanism being, of course, withdrawn simultaneously therewith, and a second cut is then made, the cam slide being drawn forward by adjustment of the cross carriage of the lathe. The set screw 27 permits adjustment to minimize travel of the body member 6 and facilitate the start of the cam along the cam guide. It also prevents narily t e operation need be repeated only once. The cam guide serves as an indicator to determine when the cutter has traveled over the length desired for the oove and the working edge of the guide wi l have a length corresponding to the length desired for a groove. In the drawings, the cam guide is shown with a notch 49 in its working edge Ill.

and this construction permits one guide to be used in cutting grooves of two difl'erent lengths. It will be understood that the cam guides are to be provided in numbers which may be used interchangeabl and when the] cam 33 clears the far end t e guide or engages the notch 49, the operator will know that the desired length of cut has been made. During the working stroke of the device, the cam is held to the edge of the guide by the 5 rin 34 which is then under com ression and when the end of thecut has been reached, the expansion of the spring will rock the cam so that its projecting corner will engage in the notch 49 or extend past the corner of the guide, as the case may be. On the return I trip, the cam will impinge against the corner of the guide or against the corner of the notch, causing it to be rocked back slightly so that the pressure of the cutter against the bushing will be relieved but there will still be positive contact between the cam and cam guide.

Various forms of grooves may be made in the bushing and in Figure 10 is shown a straight bore bushing 50 having a straight groove 51 formed therein terminating short of the ends of the bushing, while in Fi re 11 is shown a bushing 52 having a straig t bore but having a tapered groove 53 formed there- In Figure 12- is shown a bushing 54 having a tapered bore 55 with a straight groove 56 formed therein and terminating short of the ends of the bushing. Any of the grooves mav, of course, be formed to open through the ends of the bushing. The boring bar will be held against rotation by the set screw 34, but in boring tapered bores the cutter is turned to a position at a right angle to the position shown in Figure 9, and the bushing or work which is in the chuck or collet, is rotated.

It will be readily noted that I have provided a very effective and simple mechanism whereby the cutter will be held firmly to its work and the desired work accomplished speedily, accurately and easily.

Having thus described the invention, what I claim is:

1. Mechanism for the purpose set forth comprising a body member having a socket 'posite directions, means for holding the on one side, a cutter carried b said socket, a second body member slidably tted to the first mentioned bod member, a shank carried by the second b y member and engageable in the turret of a lathe, a dove-tail connection between the two body members, a sprin housedby and between the members at sai dove-tail connection and extending longitudinally thereof with its ends acting on opposite ends of and tending constantly to move the bod members in opposite directions, and a set bo t carried by the end of one body member and engaged in the corresponding end of theother body member where y to hold them in set relation. i

2. Mechanism for the purpose set forth comprising a body member having means on one side to receive a cutter, a second body member having means on one side to be en-' gaged in the turret of a lathe, a slidable connection between the inner opposed sides of said members, the members being provided at.

said connection with re 'sterin expansion spring house in sai rooves and extendin longitudinally of the y members, a p ug fitted in the groove at one end of the same and carried by one body member, a plu at the opopsite end of the grooves carrie by the other body member, the expansion spring housed in the grooves being engaged at its ends with said plugs, means for ad usting the tension of the s ring, and means for holding the body mem rs in set relation. v

3. Mechanism for the urpose set forth comprising two body mem rs slidably connected at their opposed faces, means tending constantly to move the body members in o 3 members in set relation, a cutter carried by the outer side of one body member, a late slidably mounted on the outer side 0 the other body member, means for securing the plate to the last mentioned body member in set position, and a shank extendin from said plate to be engaged in the turret o a lathe.

4. Means for the purpose set forth comrising a body, means on one side of the body or supporting the body in the turret ofalathe,

a cutter carried by the opposite side of the body, a cam pivoted eccentrically at one end of the body, a cam guide atone side of the body to be engaged by said cam whereby to mark the length of travel of the cutter, and a spring housed between and acting on the end of the body and laterally projecting end of the cam.

5. Means for the purpose set forth comprising a body member having a cutter-receiving grooves, ai.

socket on one side and provided on its opposite side with a dove-tail groove extending from end to end thereof, asecond body member provided on one side with a dove-tail tongue slidably fitting in the dove-tail groove of the first-mentioned member and provided on its opposite side with a cetral rib extending from end to end thereof, the two members being provided with mating grooves in their meeting faces extendin from end to end of the dove-tail tongue an the dove-tail groove respectivel a cam-carryin plate secured to one end one body mem er and provided with a plug fitting in said mating grooves, a cam mounted on said plate, a cam guide along which the cam may ride, a plug fitting in the matmg grooves at the opposite ends of the body members, an expansion spring fitted to and extending between the plugs and housed in the mating groot'es, a plate secured to one body member and extendm across the outer end of the last-mentione plu a screw mounted in said plate and engage in the lastmentioned plug, a set bolt mounted in said piate and threaded into the other body memr, a holding plate fitted on the rib on the second-mentioned body member and provided with longitudinal slots over the rib, securing devices inserted through said slots into the rib, and a shank extending from said plate to be held in the turret of'a lathe.

In testimony whereof, I afiix my signature.

HARRY F. ROOT. [L. 5.]