US2712273A

US2712273A - Mill head

Info

Publication number: US2712273A
Application number: US219083A
Authority: US
Inventors: Edward R Rusnok
Original assignee: Individual
Current assignee: Individual
Priority date: 1951-04-03
Filing date: 1951-04-03
Publication date: 1955-07-05
Anticipated expiration: 1972-07-05

Description

July 5, 1955 E. R. RUsNoK 2,712,273

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United States Patent MILL HEAD Edward R. Rusnok, Chicago, lll.

Appication April 3, 1951, Serial No. 219,083

9 Claims. (Cl. 90-14) This invention relates to milling machines and the like and more particularly to a mill head for use on such machines.

Various mill heads have heretofore been proposed which are of such costly, weighty, and bulky design as to greatly restrict their utility for various machining operations.

Furthermore with these prior mill heads, replacement of parts or varying the setting of the head relative to the work table is oftentimes an awkward and time-consuming step. A further disadvantage of these prior mill heads is that the feed of the tool towards the work piece is relatively slow and the sensitivity or feel of the tool during feeding is poor.

Thus it is one of the objects of this invention to provide a mill head which possesses great utility and is adapted to accommodate machines of various sizes and shapes.

It is a further object of this invention to provide a mill head which enables the operator to attain greater sensitivity of the tool and more rapid feeding thereof, thus resulting in improved quality of the finished work piece and a decrease in the machining time as well.

It is a further object of this invention to provide a mill head which' may be readily adjusted to various angular positions relative to the work table.

t is a still further object of this invention to provide a mill head which enables various parts thereof to be readily disassembled without the necessity of removing the head from the machine.

lt is a still further object of this invention to provide a mill head having means for accurately adjusting and Ineasuring the length of the feed stroke of the tool.

lt is a still further object of this invention to provide a mill head whereby the rotational speed of the tool may be easily and conveniently varied.

lt is a still further object of this invention to provide a mill heady which is simple, compact, and lightweight in construction, inexpensive to manufacture, and eiective in operation.

Further and additional objects will appear from the description, accompanying drawings, and appended claims.

In accordance with one embodiment of this inventiony a mill head is provided comprising a housing adjustably mountable on the overarm extension of a milling machine and adapiedtoassumevaus-angular positions relative/tothe work table of the machine. Reciprocally mounted within the housingsis aquill in which is rotatably mounted a tool spindle. Spaced from the quill and swivelly mounten on the housing is a spindle-driving unit which is adapted to effectively drive the Spindle' only when in certain positionsof swivelsadjus'tinent.

F'or'a'nore complete understanding of this invention reference should be made to the drawings, wherein Figs. l 2 are perspective views of the mill head; Fig. 3v is a perspective View of the mill head shown angulariyy disposed with respect to the overarm extension of the machine;

Fig. 4 is a front elevational View of the mill head shown in a vertical position;

Cil

Fig. 5 is a right-side elevational view of the mill head shown in Fig. 4;

Fig. 6 is a vertical sectional view of the mill head taken along line 6-6 of Fig. 4;

Fig, 7 is a horizontal sectional View of the mill head taken along line 7 7 of Fig. 5 and Fig. S is a fragmentary sectional view of the mill head taken along line 38 of Fig. 6.

Referring now to the drawings andmore particularly to' Figs. l through 5, a mill head is shown comprising a holising 10, a quill 11 reciprocally mounted within the housing, and a tool spindle 12 rotatably mounted within the quill. Mounted on the upper portion of the housing is a spindle-driving motor 13.

The housing 1G is secured by means of a bracket 14 to the overarm extension or shaft of a conventional type milling machine 16. While the bracket 14, shown in this instance, is of suitable type for engaging the shaft 15,v it is to be understood, of course, that the bracket may be of any other type depending on the shape or style of the overarm extension. The bracket 14, as shown, has a` split-collar 14 which is adapted to be brought into hng ging or gripping engagement with shaft 15 by tightening bolts' 17. As seen in Fig. 8, a stud 18 extends transversely from one side of the split-collar 14. Secured to the end of stud 18 by means of a holding screw 19 is a disc 20 having the outer perimeter thereof inscribed with a scale 21 calibrated into degrees. The stud 18 is embraced by a splitecollar 22 forming a portion of housing 10. inscribed onl the surface of collar 22, adjacent disc 20, is an index` mark 23 which cooperates with the calibrated scale 21 so as to indicate the angular disposition of the housing with respect to the stud 18. The housing 16 may be held in any fixed angular position relative to stud 18 by means of a tightening bolt 24 which is threadably mounted on the split-collar 220i the housing.

Housing 10 comprises upper and

lower sections

25a and 25b, respectively. The upper section 25a is in the form of a casing or guard and is mounted for swivel adjustment on the lower section 25b. AsVv seen in Fig. 6, the upper section 25a of the housing is provided with a split-collar portion 26 which embraces a sleeve portion 27 formed' in the lower section 25b. A ledge or shoulder 28 is formed in portion' 27 against which the collar por tion 26` of upper section 25a abuts. The upper housing section 25a vis held in various fixed positions of swivel adjustment by means of a tightening bolt 29 which is threadably mounted into collar portion 26.

Disposed within the upper housing section 25a are a pair of cooperating cone pulleys 30` and 31. Pulley 30 is connected to' tool spindle 12 and rotates therewith. Pulley 31, on the other hand, is keyed to the drive shaft 32 of the motor 13'. An endless belt 34 provides the operative connection between the

pulleys

30 and 31. The

relative speeds of the pulleys may be varied by movement of thef belt axially along the periphery of the pulleys.

Motor 1-3 is of a conventional reversible type and is mounted eccentrically on a bearing plate 38. The plate 38 is swivelly mounted on arim portion 35 formed on upper housing section 25a. The rim portion 35 is provided With a countersunk opening 36 in which is swivelly mounted bearing plate 38. The outer peripheral surface of plate 38 is provided with a flange 39 which rests on shoulder 37 formed within opening 36, as seen in Fig. 6. The center portion 39 enable the motor driveshaft 32 to exten-d The cutout center portion 39' is oversized thereby reducingthe weight of the plate. The plate 38 is held in various positions of swivel adjustment relative to rim pot'- tion 35 by means'of a holding screw 40. The screw iS disposed perpendicular with respect to the axis of the therethrough.

motor 13 and is threadably mounted into a tapped hole` of plate' 38- is cut ont so as to` formed in the rim portion 35 of the upper housing section a, see Fig. 4. A plug 41 is 4disposed within the tapped hole between the end of screw 40 and the outer peripheral surface of plate 38. A plurality of plate holding washers 42 are disposed uniformly about the upper side of the rim portion and are secured thereto by means of screws 44.

Motor 13 is mounted on plate 38 by means of bolts 45. A spacer sleeve 46 embraces the shank of each bolt 45 and is disposed between plate 38 and the underside of the motor 13. The length of the sleeves is dependent upon the length of the motor shaft 32, so that the cone pulley 31 may be properly aligned with respect to pulley 30. The motor 13, as heretofore mentioned, is positioned on the plate 3S so that the axis of the motor shaft 32 is disposed eccentrically with respect to the axis of rotation of plate 38, as seen in Fig. 7. Thus, due to the eccentric positioning of the motor shaft 32, the belt 34 may be readily slackened by the bolt being Unthreaded and the plate 38 rotated in a clockwise direction with respect to rim portion 35. While the belt is in a slackened condition, it may be adjusted axially along the pulleys until the belt is positioned within the proper peripheral grooves of the pulleys. When the belt is so positioned, the plate 38 is rotated in a counterclockwise direction until the belt is taut, whereupon the bolt is tightened an-d the plate remains in its counterclockwise position. ln what groove the belt is to be positioned depends upon the speed of the tool spindle desired. Sufficient clearance is provided between the

pulleys

30 and 31, and

the portion of the upper housing7 section 25a above pulley 3b is open so as to enable the belt 34 to be readily removed from the pulleys when desired. Also, Windows are provided in the sides of upper housing section 25a, so that the operator may readily determine in what pulley grooves the belt is positioned.

The quill 11 comprises an elongated sleeve 47 which is disposed within a suitable opening formed in the lower section 2512 of housing 10, as seen in Fig. 6. Projecting transversely from one side of sleeve 47 is a gauge stud 50 which extends through an elongated slot 51 formed in housing section 25h. The stud 50 is adapted, upon movement downwardly of the quill 11 relative to the housing, to abut a gauge nut 52 which is threadably mounted on shaft 53. The shaft 53 is in parallel relation with respect to the tool spindle and is held between two

lugs

54 and 55 formed on housing section 25h, see Fig. 6. An elongated scale 4S is mounted on the lower housing section 25b adjacent slot 51 and in parallel relation with respect to shaft 53. The scale 48 is calibrated in inches and indicates the length of travel of the quill relative to the housing. The gauge nut 52 has a micrometer scale 52 inscribed on the outer peripheral surface thereof. Thus the length of the feed stroke of the quill can accurately be determined by adjusting the gauge 'l nut 52 relative to the scale 48. A lock nut 56 is threaded on shaft 53 beneath gauge nut 52 and holds the latter in its adjusted position. Projecting transversely from sleeve 47 and positioned approximately ninety degrees from gauge stud S0 is a pin 80. The pin 80 is disposed within an elongated slot 81 formed in lower housing section 25h. The pin 80 and slot 81 will be described more fully hereinafter.

The quill sleeve 47 has mounted therein upper and

lower ball bearings

57 and 53, respectively. The end of quill sleeve 47 is countersunk a slight amount and is adapted to receive bearing 53. A retaining washer 60 is threadably mounted into the lower end of quill sleeve 47 and holds the bearing 58 against the shoulder 59 formed by reason of the countersinking. The inner ball race of each of the

bearings

57 and 58 is in snug engagement with the tool spindle shaft 61.

The upper end of quill sleeve 47 engages a second sleeve 62 which is secured to the end of sleeve portion 27 of the lower housing section 25h by means of screws 63, as seen in Fig. 6. Disposed within second sleeve 62 are a pair of ball bearings 64a and 64b. The inner ball race of each of these bearings is in snug engagement with a drive bushing 65. Bushing 65 is provided with an outwardly extending ange 66 which engages the upper side of ball bearing 64a. The bushing 65 is adapted to rotate with cone pulley 30 by reason of a key 67 disposed within a key way formed within the bushing 65 and the hub of pulley 30. The pulley 30 is held in place on bushing 65 by means of a tightening screw 68 which is threaded endwise into the upper end of the bushing, see Fig. 6.

The tool spindle shaft 61 is rotatably mounted within quill sleeve 47 and has the upper end 70 thereof splined, and in meshing engagement with corresponding internal grooves formed in the lower end portion 71 of the bushing 65. Thus the rotation of pulley 30 is transmitted through bushing 65 to the splined end 70 of the spindle shaft 61. The axial length of the splned end 70 of the spindle shaft 61 is suflicient so as to enable the end 70 to remain in meshing relation with the lower portion 71 of the bushing 65 when the quill is in its fully extended position relative to the lower housing section 25b.

The upper ball bearing 57 which is disposed within quill sleeve 47 is held in a longitudinally spaced relation with respect to bearing 58 by reason of a spacer piece 73. Bearing 57 is held against the spacer piece 73 by a lock nut 72 which is threaded onto a portion 72 of the spindle. The lower or exposed end of the spindle shaft 61 is provided with an axial bore 74 in which is positioned a conventional type tool collet 75. The collet 7S is actuated into gripping relation with respect to the tool 75 by means of a threaded adjusting nut 76. The locking of the tool 75' within the collet 75 is facilitated by a lock pin 90 which is mounted on the underside of the upper housing section 25a, see Fig. 4. The pin registers with a suitable opening 93 formed on the underside of pulley 30, when the pulley is in proper rotational adjustment with respect to the pin. Upon registration of pin 90 and opening 93, the pin 9i) may be pushed into the opening the full amount, as shown. When the pin is in this position the pulley 30 cannot be rotated. A circumferential groove 92 is formed in the shank of pin 90 which is adapted to receive a spring ball 91 when the pin is in its retracted position. The spring ball 91 retains the pin in its retracted position. The spring ball 91 is mounted within a suitable opening 94 formed in the upper housing section 25a.

The lower end portion of the lower housing section 25h is split and provided with a pair of lugs 77 through which is transversely threaded a locking screw 78. The screw 78 is provided with a convenient handle 78 so that it may be readily manipulated by the operator. Upon tightening of screw 78, the quill can be locked in any extended position relative to the housing.

Pin S0, as heretofore mentioned, projects transversely from the quill sleeve 47 through an elongated slot 81 formed in the lower housing section 25h. Pivotally mounted on the end of pin 86 isV a link 85, which in turn is pivotally connected at 86 to a handle lever 87. One

end of lever 37 is pivotally mounted on the housing 10 at point 88.

Mounted on and extending transversely from pin 80- and disposed intermediate the housing section 25h and'V link S5 is an elongated stud 82. The free end of the stud` 82 is disposed within a socket 83 formed in housing section 25b. Positioned within socket 83 is a coil spring 84 having one end thereof engaging the free end of the stud S2 and causing the quill 11 to normally assume a retracted position with respect to the housing 10.

When required, the quill 11 and tool spindle 12 may be readily disassembled from the lower housing section 25b without the housing section 25h being disengaged from the overarm extension 15 of the machine 16. To effect removal of the tool spindle 12 from the quill sleeve 47, the retaining ring 60 is removed from the lower end of the quill sleeve 47 whereupon the tool spindle 12, including bearings 57 and 5S may be withdrawn endwise from the sleeve.

Thus it will be seen that a lightweight mill head of simple construction has been provided which is readily adjustable to assume various angular positions with respect to the overarm extension of the machine thereby increasing the utility of the machine. Furthermore the mill head enables the operator to obtain greater sensitivity of the tool and more rapid` feeding thereof, thereby improving the quality of the nished work piece and decreasing the time for finishing the work piece as well.

While a particular embodiment of this invention is shown above, it is to be understood, of course, that the invention is not to be limited thereto, since many modifcations may be made, and it is contemplated, therefore, by the appended claims, to cover any such modifications as fall within the true spirit andscope of this invention.

I claim:

l. A mill head comprising a housing, a quill mounted on said housing for linear movement relative thereto, resilient means normally maintaining said quill in a retracted position, a tool spindle rotatably mounted within said quill, a quill-actuating element pivotally mounted on said housing, means operatively connected to said quill and to a point on said element spaced from the pivotal axis thereof for transmitting the movement of said element to said quill, a supporting member rotatably mounted on said housing, a spindle-driving unit mounted eccentrically on said member, and an operative connection between said unit and said spindle being effected by the relative position of rotational adjustment of said member.

2. A mill head comprising a housing, a quill telescopically mounted on said housing, resilient means urging said quill to normally assume a retracted position, a tool spindle rotatably mounted within said quill, a quill-actuating element pivotally mounted on said housing, means operatively connected to said quill and to a point on said element spaced from the pivotal axis thereof for transmitting movement of said element to said quill,'a spindledriving unit swivelly mounted on said housing, means for locking said unit in various positions of swivel adjustment, and an operative connection between said unit and said spindle, said connection being effected by the relative position of swivel adjustment of said unit.

3. A tool-supporting device for use with a machine having a work-supporting surface and a supporting arm spaced from said surface, comprising a housing disengageably mountable on said arm and adapted to assume various angular positions relative to said surface, a quill mounted within said housing for movement towards or away from said surface, resilient means urging said quill to normally assume a position away from said surface, a handle pivotally mounted on said housing for actuating said quill from its normal position to a fully extended position, means operatively connected to said quill and to a point on said handle spaced from the pivotal axis thereof for transmitting movement of said handle to said quill, means mounted on said housing for adjusting the fully extended position of saidgquillv-relative to said surface, a tool-Slgindle--rotataby' mounted .within said quill and movable therewith, an apertured plate swivelly mounted on said housing and spaced from said quill, and a spindledriving unit mounted eccentrically on said plate and operatively connected to said spindlel for actuating said spindle only upon movementfof said plate to various positionsof swivel adjustment.

' "44."A mill head comprising a housing, a quill mounted on said housing for linear relative movement, a spindle rotatably mounted in said quill and axially fixed relative thereto, a quill-actuating element mounted on said housing for pivotal movement about an axis disposed transversely with respect to the direction of linear movement of said quill, resilient means maintaining said quill in a retracted position, spindle rotating means fixed in saidhousing and in driving engagement with said spindle, and meansoperatively connected to said quill and to a point on said element spaced from the pivotal axis thereof to effect linear movement of said quill upon pivoting of said element.

5. A mill head comprising a housing, a quill telescopically mountedV on said housing and normally assuming a retracted position relative to said housing, a spindle rotatably mounted in said quill and axially fixed relative thereto, a quill-actuating element pivotally mounted on said housing, resilient means maintaining said quill in a retracted position, spindle rotating means fixed in said housing and in driving engagement with said spindle, and means operatively connected to said quill and to a point on said element spaced from the pivotal axis thereof to effect telescopic movement of said quill upon pivoting of said element.

6. A mill head comprising a housing provided with an elongated slot, an elongated quill telescopically mounted within said housing, the direction of movement of said quill being substantially parallel to said slot, an elongated shaft fixed in spaced relation on said housing and in substantially parallel relation with respect to said slot, an adjustable stop mounted on said shaft and adjustable with respect to said housing for limiting the extent to which the quill can project from the housing, a stud mounted on and extending transversely from said quill, said stud projecting through said elongated slot and abutting said stop when said quill assumes an extended position relative to said housing, and means operatively connected to said quill and housing for electing movement of said quill.

7. A mill head comprising a housing provided with an elongated slot, an elongated quilltelescopically `mounted within said housing, the direction of movement of said quill being substantially parallel to said slot, a calibrated scale mounted on said housing adjacent to said slot and in substantially parallel relation with respect to said slot, an elongated stationary shaft mounted in fixed spaced relation on said housing and in substantially parallel relation with said scale, a stop threadably mounted on said shaft, the relative position of said stop on said shaft determining the extent to which said quill can move relative to the housing, a second scale mounted on the periphery of said stop and calibrated in fractions of the graduations of saidv elongated scale, a stud mounted on and extending transversely from said quill, said stud projecting through said elongated slot and abutting said stop when said quill assumes an extended position relative to said housing, and means operatively connected to said quill and housing for effecting movement of said quill.

8. A mill head comprising a housing provided with an elongated slot, an elongated quill telescopically mounted within said housing, the direction of movement of said quill being substantially parallel to said slot, a calibrated scale mounted on said housing adjacent to said slot and in substantially parallel relation with respect to said slot, an elongated stationary shaft mounted in fixed spaced relation on said housing and in substantially parallel relation with said scale, a stop threadably mounted on said shaft, the relative position of said stop on said shaft determining the extent to which said quill can move relative to the housing, a second scale mounted on the periphery of said stop and calibrated in fractions of the graduations of said elongated scale, a stud mounted on and extending transversely from said quill, said stud projecting through said elongated slot and abutting said stop when said quill assumes an extended position relative to said housing, and means operatively connected to said quill and housing for effecting movement of said quill, said means comprising a quill-actuating element pivotally mounted on said housing, means operatively connected to said quill and to a point on said element spaced from the pivotal axis thereof for transmitting the movement of said element to said quill.

9,. A mill head comprising a housing having an elongated slot therein, a quill mounted on said housing for.

. spaced from the pivotal axis thereof to effect linear movement of said quill upon pivoting of said element.

References Cited in the file of this patent `UNITED STATES PATENTS 2,055,888 Yager et al. Sept. 29, 1936 2,126,990 Graves Aug. 16, 1938 2,178,130 Zwick Oct. 31, 1939 2,296,573 Richards Sept. 22, 1942 2,349,199 Richards May 16, 1944 2,359,295 Bok Oct. 3, 1944