US2848912A - Chamfering tool - Google Patents

Description

i 26, 1958 E. J. KALATY CHAMFIERING TOOL z Sheets-Sheet 1 Filed June 22, 1955- v v mmvrox ELMEQ J Mum BY ac/4E7, wATTs, sage/emu MNENNY A 7'TOENE Y5 Aug. 26, 1958 E. J. KALAT CHAMFERING TOOL 3 Sheets-Sheet 2 Filed June 22, 1955 Q/CHEY, WATTS, wee/270M MA/fA/NY ATTOEA/EYS 1953 E. J. KALAT ,9 2

CHAMFERING TOOL Filed June 22, 1955 3 Sheets-Sheet 3 v JNVENTOR. Y mfg-J 5/ y i 5 P/CHE'Y, WATT; EDGEETOA/MA/ENNY ATTUENEJS United States Patent CHAMFERING TOOL Elmer J. Kalat, Bedford, Ohio, assignor to The Maxwell Company, Bedford, Ohio, a partnership consisting of Henry S. Reddig, Thelma D. Reddig, and Elmer J. Kalat Application June 22, 1955, SerialNo. 517,229

6 Claims. c1; '17-ss This invention relates to recessing tools and more particularly to recessing tools which automatically feed the tool into the work without movement of the Work relative to the center of rotation of the head.

This application is a continuation-in-part of my copending application Serial No. 379,660 filed September 11, 1953, now abandoned.

One of the objects of this invention is to provide a recessing tool which is compact, balanced and easy to manufacture.

Another-object of this invention is to provide a re cessing tool which is automatic in operation and has a minimum of moving parts, thereby reducing wear and maintenance and eliminating costly adjustment time.

Recessing tools have been devised which utilize levers and toggles for advancing and retracting the cutting tool. Such recessing tools are susceptible to wear at the pivot points with consequent loss of adjustment and short life in operation. The mechanism which forms the preferred embodiment of this invention avoids the disadvantages of the prior devices by including sturdy and rugged parts instead of the fragile and multiple-jointed toggle mechanism.

By utilizing axially slidable parts arranged for relative movement, it is possible to advance tools radially into the work by axial movement of the spindle. accomplished by camming the tool bit holder radially while the tool is in cutting motion. The tools may be carried axially while being diplaced radially with the result that an annular cut is made. The angle of the cut may be easily controlled by determining the increment of an axial displacement. It is also possible to incorporate a plurality of cutting tools in the tool assembly and to regulate the displacement of the individual bit holders to obtain a cutting path as required to obtain the finished dimensions.

Accordingly, it is a primary object of this invention to provide a tool wherein the cutting tools are advanced in a cutting path at an angle to the axis of rotation of the spindle.

A still further object of this invention is to provide a cutting tool capable of advancinga plurality of cutting tools into the work simultaneously and having a controllable cutting path and dimension.

This is Other objects and advantages more or less ancillary 0 Fig. 3 is a longitudinal sectional view of a modified 7 form of arecessing tool.

2,848,912 Patented Aug. 26, 1958 ice Fig. 4 is a sectional view taken along line 44 of Fig. 3.

Fig. 5 is a diagram showing the motion of one of the tools.

Fig. 6 is adiagram showing the motion of another tool.

Fig. 7 is a detailed view of the tool body.

Fig. 8 is a detailed view of the actuating shaft.

Fig. 9 is a detailed view of the cutter bars.

I Fig. 10is an end view of the cutter bars shown in Fig. 9.

Fig. 11 is a side view of the cutter bars shown in Fig. 9.

Fig. 12 is a cutter bar.

Fig. 13 is an end view 'of the cutter bars shown in Fig. 12; and

Fig. 14 is a fragmentary side view of the cutter bars shown in Fig. 12.

Referring first to Fig.- 1, there is shown a recessing tool which is a preferred embodiment of my invention having a body 11 which is elongated and has a bore 12 formed in one end, the axis of the bore 12 being at an acute angle with and intersecting the medial aXis of the body 11. A sliding block 13 is located in the bore 12 and is machined to slide longitudinally in the bore during operation of the device. The block '13 is drilledto receive a tool holder 15, the-tool holder 15 being parallel to the medial axis of the body 11. The medial axis of the tool holder 15 and the body 11 coincide when the block is at one end of its path of travel. The tool holder is held in place in the body by a set screw 16 threadably mounted in the block 13.

A transverse slot 17 is formed in the body intersecting the bore 12 and the medial axis of the body 11. The block 13 has a bore 18 drilled therethrough perpendicular to the axis of the body 11 and in register with the slot 17. A pin 19 freely slida'ble in the slot 17 extends through the slot 17 and the bore 18 of the block 13.

A sleeve 20 is slidably carried by the body 11 and has a pair of openings 21 on opposite sides thereof to receive the ends of the pin 19. A stop collar 22 is threadably and adjustably mounted on the end of the body opposite the tool holder for limiting the move ment of the body relativeto the sleeve as the body moves into the sleeve.

At the opposite end of the sleeve to the adjusting collar, a pilot 23 for engagement with the work is mounted on a thrust bearing 24 which is held to the sleeve by a nut 25 threadably engaged therewith. The pilot 23 is sized to fit the end wall of the work and functions to steady the end of the recessing tool as the machining operation is performed. A threaded recess 26 is formed in the body along the centerline for use in mounting the recessing tool on the tool holder or turret of the machine.

The recessing tool is particularly adapted for cutting a groove 27 in work 28 having a cylindrical bore formed therein. An ordinary cutting tool 29 is mounted in the end of the boring bar 15, an adjustment being provided for setting up the depth of cut.

In operation, the recessing tool is moved to the work and the pilot 23 brought into engagement with the work 28. Further longitudinalmbvment of the body 11 produces lateral movement of the tool holder 15 bringing the tool 29 into cutting engagement with the work 28.

- This lateral movement is produced by the wedge action of the body 11, the angular bore 12, the block 13 and the pin 19. As the body 11 moves relative to the sleeve, the pin 19 holds the block '13 against longitudinal motion relative to the sleeve, thus causing the block 13 to be displaced laterally by the action of the angular bore 12. Since the block is prevented from moving longitudinally by the pin relative to the sleeve-movement of the body, it

moved to provide for greater or lesser relative movement 1 of the body and the sleeve, thus changing the amount of lateral displacement of the tool. This adjustment is very fine and easier to make than to reposition the tool in the tool holder. Improved results in the accuracy of the work obtained by using the recessing tool are had by virtue of the durability and ruggedness of the parts and the ease with which adjustments maybe made to obtain the desired dimensions.

A modified form of my invention is shown in Figs. 3 to l4 wherein the tool is advanced radially into work While traveling in the direction of its axis of rotation. In the assembled view identified as Fig. 3, a body of elongated cylindrical form is rotatably carried by a pair of anti-friction bearings 41. The bearings 41 are mounted in a pilot sleeve 42 which functions to engage the work and hold the body 40 in alignment during the machining operation. A work piece 43, for purposes of illustration, may take the form of a cylinder bore in an engine block, the machining operation being to chamfer the marginal portion of the block at the ends of the cylinder bore.

The pilot sleeve 42 is dimensioned with clearance necessary for sliding the tool into the cylinder to the cutting position. When the sleeve 42 is in the cylindrical bore, the body 40 is in alignment with the axis of the bore and all parts carried thereby are maintained in the present relationship with the work.

A stop collar 44 having a diameter larger than the sleeve 42 confronts and engages the work piece 43 when the tool is in the operating position. An outer stop collar 45 is threadably mounted on the stop collar 44 in order that the axial position thereof may be adjusted to a predetermined relationship to the reference face of the work piece. A set screw 46 carried by the collar 44 engages the collar 45 and maintains the predetermined adjustment thereof.

The outer stop collar 45 retains an anti-friction bearing 47 which is mounted on a bearing carrier 48 that lies between the body 40 and the bearing 47. The bearing carrier 48 is perforated to receive a pin 49 which extends diametrically across the carrier 48. Elongated slots 50 are formed in the body 40 to receive the pin 49 and allow axial movement of the body 40 relative to the pin 49.

A shank 51 is threaded in the end of the body 40 and has a standard taper for making a connection between the tool and the drive spindle of a machine.

An actuating shaft 52 is provided for translational movement internally of the body 40. Shaft 52 has a diametrical bore 53 which receives the pin 49, thus locking the shaft 52 to the stop collar 44. The shaft 52 therefore is always in one predetermined position, as determined radially by the pilot sleeve 42 and axially by the stop collars 44 and 45. A recess 54 is formed in the shank 51 confronting the shaft 52 for receiving a spring 55 which bears against the end of shaft 52 and urges the body 40 into the position shown in Fig. 3 wherein the pin 49 is at the left-hand end of the slot 50.

The shaft 52 has a bifurcated end opposite to the bore 53 formed by a slot 56 along the axis of the shaft 52. The slot 56 receives a cutter bar 57 having a rectangular cross section which is dimensioned for a sliding fit in the slot 56. Opposed openings 58 are formed in the body 40 for slidablyreceiving the bar 57 in the preferred embodiment of my invention. The openings are disposed at an angle of 75 to the axis which positions the bar 57 for lateral travel at an angle of 75 to the axis of rotation of the tool assembly. A slot 59 is formed across one face of the bar 57 at an angle of 60 to the center line of the bar 57 and at an angle of 45 to the axis of rotation of the body 40. A key pin 60 is located in a cross bore 61 formed between the slot 56 and the outer wall of the shaft 52. The key pin 60 has a portion in engagement with the slot 59 and an annular groove 62 formed in the shank portion located in the bore 61 for receiving the end of a dog point set screw 63 which functions to retain the key pin 60 in operating position. The set screw 63 is threadably mounted in a bore 64 in the shaft 52 which intersects the bore 61.

A tool bit 65 is located in a bore 66 formed in the end of bar 57. The bore 66 is formed in the bar 57 in such a manner that the center line thereof intersects and is perpendicular to the center line of shaft 52. A socket head set screw 67 is threaded into the end of bit 65 and has the head thereof in engagement with the bottom of the bore 66. By adjusting the screw 67 the location of the cutting portion of bit 65 may be predetermined before the bit 65 is installed in the bar 57.

The tool bit 65 is locked in position by a socket head set screw 68 threadably mounted in the bar 57 for engagement with a flat 69 formed on the upper portion of the tool bit 65.

As the entire tool unit of Fig. 3 is moved into a bore in the work piece 43 there is no motion of the tool bars 73 and 57 relative to the work until the collar 44 abuts the end face of the work piece whereupon the carrier 48 and the pin 49 carried thereby cease moving longitudinally. However, the shaft 52 will continue to move to the left until the pin 49 reaches the end of the slot 50 and stops movement of the body 40. As the shaft 52 and body 40 are moved to the left (Fig. 3), the bar 73 will be directed upwardly and outwardly by the inclined slot 75 riding on the stationary pin 77. The bar 57 at the opposite end of the tool functions in a similar manner except the slot arrangement provides for downward and outward motion instead of upward and outward motion.

In Fig. 5 the directions and distances of travel of the elements of the tool assembly located at the end thereof are shown vectorially for diagrammatically illustrating the operation of the automatic positioning features of the device. Line 70 corresponds to the direction of and distance travelled by the shaft 52. The line 71 illustrates the direction of travel of the bar 57 and the extent of that travel relative to the travel of the shaft 52. The resolution of these vectors results in line 72 which is the path of travel of the tool bit 65. The chamfer applied to the work piece 53 will have an angle of 45 to the center line of the bore since the line 72 is at an angle of 45 with the line 70. The slot 59 is formed in the bar 57 at such an angle that when the bar 57 is in place the center line of the slot 59 will be at an angle of 45 to the center line of the shaft 52.

A second tool bar 73 is located at the end of the body 40 opposite to the bar 57 and is shiftably mounted for movement perpendicular to the axis of the body 40. Openings 74 are formed in the body 40 for slidably receiving the bar 73. A slot 75 is formed across one face 'of the bar 73 at an angle of 20 to the longitudinal center line thereof and receives a key pin 76 which is located in a cross bore 77 formed in the shaft 52. An elongated slot 78 formed in the shaft 52 receives the bar 73 and allows translational movement of the shaft 52 relative to the bar 73. The key pin 77 is held in position similarly to key pin 60 by a dog point set screw 79 which engages an annular groove 80 formed in the shank portion of the key pin '76 located in the bore 77. The set screw 79 is held in a threaded bore 81 which intersects the bore 77 at right angles.

A tool bit 82 is positioned in a bore 83 formed in the end of the bar 73 and has a socket head cap screw 84 threadably mounted in the end thereof. The head of the cap screw 84 engages the bottom of the bore 83 for holding the same in a predetermined relationship with the bar 73. The bit, 82 is locked in position by a set screw which is similar to the one which locks bit 65 in place.

In Fig. 6 a vectorial diagram is shown having a line 85 corresponding to the direction and distance of travel of the shaft 52. The line 86 represents the direction and distance of travel of the bar 73 relative to the shaft 52. The resultant path of travel of the tool bit 82 is shown by line 87 which is an an angle of 20 to the center of rotation of the shaft 52. Accordingly, the tool bit 82 moving inwardly along a path as illustrated by line 87 would chamfer the work piece at a 20 angle to the axis of rotation of the tool assembly.

Since each tool bar 72 and 57 is actuated by the movement of the shaft relative to the body 48, the cutting actions thereof are controlled and performed simultaneously by the continued inward movement of the spindle drive. When reconditioning of the tool bits 82 and 65 is required the adjustment of the cap screws 80 and 67 respectively may be made to return the cutting edge of the bits 82 and 65 to the original position without changing the relative position of the other parts of the device. This makes the tool easily adaptable to automatic operation through a large number of cycles while obtaining a high degree of accuracy and reliability in the results.

Although the foregoing description is necessarily of a detailed character, in order that the invention may be completely set forth, it is to be understood that the specific terminology is not intended to be restrictive or confining, and that various rearrangements of parts and modifications of detail may be resorted to without departing from the scope or spirit of the invention as herein claimed.

What I claim and desire to secure by Letters Patent is:

1. A recessing tool comprising an elongated body having a bore formed therein at an angle with the axis of the body, a shiftable sleeve carried by said body for engagement with a work piece, slide means in said bore, a cutting tool carried by the slide means, and a pin afiixed to the sleeve and slidably engaged with the slide means, said pin holding the slide means against longitudinal movement while allowing lateral movement relative to the sleeve as said body is moved toward the work piece, whereby the cutting tool is brought into engagement with the work piece.

2. A recessing tool comprising an elongated body having a bore formed therein at an angle with the axis of the body, a shiftable sleeve carried by said body for engagement with a work piece, slide means in said bore, a cutting tool carried by the slide means, a pin affixed to the sleeve and slidably engaged with the slide means, said pin holding the slide means against longitudinal movement while allowing lateral movement relative to the sleeve as said body is moved toward the work piece, whereby the cutting tool is brought into engagement with the work piece, and stop means adjustably mounted on the body for limiting movement of the sleeve relative to the body.

3. A recessing tool comprising an elongated body having a bore formed therein at an angle with the axis ofthe body, a shiftable sleeve carried by said body for engagement with a work piece, slide means in said bore, a cutting tool carried by the slide means, a pin afiixed to the sleeve and slidably engaged with the slide means, said pin holding the slide means against longitudinal movement while allowing lateral movement relative to the sleeve as said body is moved toward the work piece, whereby the cutting tool is brought into engagement with the Work piece, and a longitudinally adjustable stop nut threadably mounted on the body for limiting the travel of the body relative to the sleeve.

4. A recessing tool comprising an elongated body having a bore formed therein at an angle with the axis of the body, a shiftable sleeve carried by said body, a pilot rotatable on one end of said sleeve for engagement with a work piece, slide means in said bore, a cutting tool carried by the slide means, and a pin affixed to the sleeve and slidably engaged with the slide means, said pin holding the slide means against longitudinal movement while allowing lateral movement relative to the sleeve when said pilot engages the work and the body is moved relative to the sleeve.

5. A recessing toolcomprising an elongated body having a bore formed therein at an angle with the axis of the body, a shiftable sleeve carried by said body, pilot means rotatable on one end of said sleeve for engagement with a work piece, slide means in said bore, a cutting tool carried by the slide means, and a pin affixed to the sleeve and slidably engaged with the slide means, said pin holding the slide means against longitudinal movement while allowing lateral movement relative to the sleeve when said pilot engages the work and the body is moved relative to the sleeve.

6. A recessing tool comprising an elongated body having a bore formed therein at an angle with the axis of the body, a shiftable sleeve carried by said body, pilot means rotatable on one end of said sleeve for engagement With a Work piece, slide means in said bore, a cutting tool carried by the slide means, a pin aflixed to the sleeve and slidably engaged with the slide means, said pin holding the slide means against longitudinal movement while allowing lateral movement relative to the sleeve when said pilot engages the work and the body is moved relative to the sleeve, and stop means adjustably mounted on the body for limiting movement of the sleeve relative to the body.

References Cited in the file of this patent UNITED STATES PATENTS 1,312,737 Krueger Aug. 12, 1919 1,858,852 Cleveland et al. May 17, 1932 2,067,593 Benninghoff Jan. 12, 1937 2,228,498 Young Jan. 14, 1941 2,247,284 Young June 24, 1941 2,291,744 Nell Aug. 4, 1942 2,365,549 Haynes Dec. 19, 1944 2,773,402 Edens Dec. 11, 1956

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