Feed-reversing device.

  • Inventors: JOHN BECKER
  • Assignees: John Becker
  • Publication Date: September 26, 1916
  • Publication Number: US-1199337-A

Abstract

Claims

l. BECKER. FEED REVERSING DEVICE. APPLICATION FILED APR. 2!. i910. 1,199,337. PatentedSept. 26, 1916. 2 SHEETSSHEET 1. witness es Inventor.- Johnlieciaer, 2 SHEETS-SHEET 2 1. BECKER. FEED REVERSINGDEVICE. APPLICATION FILED APR. 21, IQIO. Patented Sept. 26,1916. llllll N l "Nil Iii 3Q 1} w "HM witnesses Ifiventor: ' 5 am W 7 tlt z s. JOHN BECKER, OF HYDE PARK, MASSACHUSETTS. EEED-EEvEEsmG DEVICE. Specification of Letters Patent. Application filed April 21, 1910. Serial No. 556,719. To all whom it may concern Be it known that I, JOHN BECKER, a citizen of the United States, and a resident of Hyde Park, in the county of Norfolk and State of Massachusetts, have invented an Improvement in Feed-Reversing Devices, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts. This invention is an improvement in feed reversing devices and for purposes of illustration is shown herein as applied to a vertical milling machine, although it will be understood that it may be readily applied to other uses. The character of the invention may be best understood by reference to the following description of an illustrative embodiment thereof shown in the accompanying drawings, wherein: Figure 1 is a front elevation of a vertical milling machine equipped with a feed reversing device embodying my invention; Fig. 2, on an enlarged scale, shows usual driving gears for the work table; Fig. 3, on an enlarged scale, is a front elevation of the feed reversing device shown in Fig. 1; Fig. 4 is a plan of the mechanism shown in Fig. 3; Fig. 5 is a horizontal section taken on line 55 of Fig. 3; Fig. 6 is a section taken on line 66 of Fig. 4; Fig. 7 is a section taken on line 77 of Fig. 3; and Fig. 8 is a section taken on line 88 of Fig. 3. Referring to the drawings, 1 represents a column-like base carrying a vertically adjustable knee 3 supporting a table base 5 carrying a work table 7. Said base 1 extends upwardly curving forwardly to form a bearing 9 receiving a vertical spindle 11 having a pulley 12 which may be driven by a belt in the usual manner. The table 7 may be fed by a feed screw shaft'13 (Fig. 2) carrying a spur gear 15 driven by a pinion 17 loose on a short countershaft 19 journaled in bearings 21 secured to the work table base 5. The pinion 17 is provided with a hub rotative in the bearing 21 and having at its opposite end a bevel pinion 23. This pinion may be connected to the shaft 19 by a spool clutch 25 splined to the shaft 19 to drive the feed screw shaft 13 from the shaft 19 in one direction. To drive the feed screw shaft 13 in an opposite direction there is provided a bevel pinion 27 loosely mounted on the shaft 19 meshing with an intermediate pinion 29 which also meshes with the bevel pinion 23. When the spool clutch is slid into engagement with the bevel pinion 27 the drive from the shaft 19 will be through the bevel pinion 27, the intermediate pinion 29 and the bevel pinion 23 to the feed screw shaft 13 thereby rotating the latter in an opposite direction. The spool clutch may be shifted to connect one or the other of the bevel pinions 23 and 27 to the shaft 19 by a rocking arm 31 fulcrumed on a pin 33 and having a yoke end received by an annular groove in said spool clutch. The parts described above may be of usual construction and are described herein as illustrative of a use of my improved feed reversing device which I will now describe. This feed reversing device is utilized herein to rock the arm 31 and shift the spool clutch as described, and comprises a sliding rod 35 i (Fig. 3) having at one end a reduced, rounded portion adapted to slide in a bracket 37 secured to the work table base 5 in any suitable manner. The opposite end of said rod is guided by a bracket 39 secured to said base 5. To detachably connect the rounded end of said rod 35 to the spool clutch controlling arm 31 said rod herein is provided with a head 41 having a transverse groove 43 in the under side thereof adapted to receive a pin 45 projecting upwardly from a handle arm 46 fulcrumed on a pin 46*, said arm 46 being connected to said clutch arm 31 by a pin 46 on the latter received by a fork 46 on said handle arm. Patented Sept. 26, 1916. In accordance with my invention the rod face of said work table base. To rock said 35 is moved longitudinally in said guides 37 slid to various positions of adjustment in T slot 67 in the face of the work'table 7 and be held in its positions of adjustment by ,a suitablebolt 69; Theother arm 51 is adapt.- ed to be engaged bya roller 71 similar and similarly mountedto, that described, with this exception, that. the roller 71 is, set farther from .the fails of the wolk table in order that it -may wipe across the arm 51 without engagement With the arm 59. It willv be. apparent that as the .Work table is fed tothe right of Fig, 3 the dogroller 71 will wipe across the backof thearm 61, and rock the disk in a clockwise direction and when the table is travelingin an.opposite direction the roller v68,,will wipe across the back of the arm 59 and rock,the disk 55' in an opposite or contra-clockwisev direction. These rocking movements of the disk55narle utilized to energize means for shiftingthe rod 35 which I will now. describe This means comprises a plungerFSjadapted ,to slide longitudinally .in a boss bracket .75 se; cured to the face of thewo-rk table base, said plunger being prevented, from rotative movement therein by .a spline, .77 (Fig. 5) entered into a longitudinal keyway in said plunger. Theplunger is provided witha wedge ,or. substantially conical nose;. 79 ,hav; ing a flattened face .81 for engagemenhwith a roller 83 carried by the disk, 55. The plunger is normally pressed outward into engagement with said roller by. a helical spring 85 havingone .end containedwithin said plunger and its opposite;.endcontained in a plug 87 threadedintothe bracket .7 5 and provided with a disk handle 89 having a knurled periphery. Byturning said handle the plug 87 will, be moved in or outof the bracket 7 5 more or less to yary the tension. of the spring 85 asdesired. In operation it may be supposed that the tongue 47 is rocked .'n a contra-clockwisedirection and that the rod 35 is moved. to shift the spool clutch to connect the bevel; pinion .27 to the.shaft,19 andtherebytransmitthe drive to the feed screw shaft 13 through the intermediate pinion. .29- and the pinionv 23. The sl1aft19. being continuously rotated this will cause the work-table,. for example to feed toward the right of Fig.3. I lVhenthe tongue disk 55.is' thus rocked. in a contraclockwise direction to. the position. described the disk roller will engage.thelower, .periphery of the cone end of the plunger 73 and the plunger will be pressed outwardly 61, of hardened steel or other herein in the form ofva thereto from its bracket by the spring contained therein. After the roller dog 71 has been adjusted on the table to a point where it is desired to change the direction. of feed, the table byits travel eventually will cause the roller 71 to engage the back of the arm 61 and .rock, the disk 55 in a clockwise direction. The initial rocking of the disk 55 in this direction, first will cause the roller .83 to travel from the lower periphery of the cone 7 9 to the apex or high point thereof and thereby press the plunger into its bracket and compress thespring85a When the dog roller -7 1 has subsequently rocked the disk 55 sci-that the diski, roller .83 is slightly .beyond the apexof, theplunger ,coneend. the rocking I of the, disk. 55 will; no longer be effective to press the plunger into its bracket ment of the disk 55 will'ca-use its tongues? to engage -,the,.eccentr,ic. lug a9 and slidethe rod 35lto the. leftrof. Fig.3 thereby shifting the spooLclutch 25.;fr'om. engagement. with the. bevel pinion 23. As ares ult thedirec tion of rotation .of. the table feed screwshaft l3 willbe reversed antlthetable willco-mmence to feedito the, left-gof Fig. 3. When said table. has traveled a sufl cient distance to bring the dog roller 68 into engagement with the other .diskarm 59, said roller will wipe across theback ofv the latter and rock the disk55, in a contra-clockwise direction, thereby causing the roller 83 to travel from the upper edge oftheperiphery of the, cone end of the, plunger .73 down to the apex thereof and as soon as the roller 83 passes beyond said apex the. downward incline, of thecone end of said plunger will jbeefiective to rock the disk, 5501i in a contra-clockwise directionwith a sharp, quick movement and cause the disk tongue L? to. engage the eccentriclug, 51 andshift therod to. the right of Fig. 3 and again connect the-bevel pinion 27 to theshaft19. ,It will be apparent that by repeated operations such as described, the direction. of feed thus may be automatically indefinitely reversed. The, tongue. disk. and. spring; pressed plunger. constructionv described are found to be very effective. since, .among other reasons, the spring of the plungernotonly throws the spool into engagement with one or another of the clutch faces of the pinions 27' f, to until the spool clutch is again shifted to change the direction of travel of the table. Having described the construction and operation of the mechanism whereby the direction of feed of the table is automaticallychanged, I will now describe adjustments and means for throwing the clutch into its mid position to stop the feed of the table. To move the spool clutch to this mid position the plunger should be pressed in out of engagement with the disk roller 83 and held in this position. As shown herein this may be effected by a plunger locking arm 91 (Fig. 6) pivoted to the top of the bracket 7 5 and having a portion 93 adapted to enter slots 95 and 97 extending transversely of said bracket and plunger. It will be apparent that when the plunger is pressed in sufiiciently to bring the slots 95 and 97 into registration the portion 93 of the arm 91 may be entered into said slots thereby securely holding the plunger out of engagement with the disk roller 83. It may be supposed that it is desired to arrest the table at the end of a feed toward the left in Fig. 3. When the roller 63 engages the disk arm 59 the disk will be rocked in a contra-clockwise direction but since the plunger 73 is out of engagement with the disk roller 83 the spring of the. plunger will not be energized by said movement and the plunger will not be effective to further rock the disk in a contra-clockwise direction, or, in other words, the rocking of the disk 55 under these conditions is effected merely by the direct engagement of the roller 63 therewith. With the eccentric lug 51 in the position shown in Fig. 3 the engagement of the tongue 47 therewith as occasioned by the rocking of the disk 55 by means of the roller 63 would not be sufficient to throw the spool clutch to its mid position. In order that this movement may, be effective to bring said clutch to its mid position the eccentric 51 is turned by its handle 53 about in a contra-clockwise direction. This will in efiect adjust the lug longitudinally of the rod 35 toward said tongue and when the disk 55 is rocked by the roller 63 as described, the rocking movement transmitted to said disk then will be sufficient to shift the rod 35 and cause the clutch to arrive at its mid position, out of engagement with either of the bevel pinions 23 and 27, and the rotation of the shaft 19 will be rendered inefiective. To insure the arrest of the spool clutch the top of the rod guide 37 referred to. When the rod 35 is shifted as just described the wedge end of the finger 99 will seat itself into said depression and will thereby hold the spool clutch in its mid position. In a similar manner if it is desired to arrest the feed of the table at the end of a feed to the right of Fig. 3, the eccentric lug 4:9 is rocked in a clockwise direction substantially 90 and the clutch will be thrust to its mid position by the engagement of the dog roller with the disk arm 61 in a manner similar to that just described when the table is feeding to the left of Fig. 3. To prevent accidental engagement of the spool clutch with either of the bevel pinions when the table is not being fed, the rod 35 may be locked to prevent longitudinal movement thereof. To this end the rounded portion of the rod 35 may be provided with a transverse groove 105 (Fig. 8) adapted to receive a thick portion 107 of a lock pin 109. To permit the reciprocation of said rod this pin may be pulled upwardly to bring a re duced end 111 of said pin opposite to said groove 105 said pin being held in its position by a humped spring 113. I n I t In some instances 1t may be deslred to feed the table in one direction, reverse the feed, and then automatically stop the table. I For example, sometimes it is desirable to make a fairly heavy cut of substantial depth in the stock, while feeding in one direction, and then make a light finishing cut when feeding in the opposite direction. Under the strain of making the initial heavy cut the tool will be caused to spring more or less, so that when the subsequent feed is made in the opposite direction the tool will spring back to its normal position and will make the light finishing out without further adjustment. The feed reversing device described lends itself advantageously to such work since it may be set to feed the table in one direction, automatically reverse the feed, and automatically stop without further attention of the operative other than to start the initial feed. For example, it may be supposed that it is desired to feed the table toward the left of Fig. 3, reverse the feed to the right of Fig. 3, and then automatically stop at the end of said feed. To efiect this series of op erations, first the handle 53 of the eccentric lug 19 is turned clockwise through an arc of about ninety degrees, to adjust the lug 49 along the rod 35, to the right of Fig. 3 toward the depending disk tongue 4:7. Then the clutch shift handle 46 is rocked to the left of Fig. 2. (the direction of desired table feed) to shift the spool 25 and cause the gear 23 to rotate with the shaft 19 and thereby cause the table to commence to travel toward the left of Fig. 3. Eventually the roller dog 63 will engage the disk arm 59 and rock the disk in a contra-clockwise direct on, causmgthe d1sk'roller 83 to pass from the upper edge of the base of the cone end 79 to the ape'xthereof. This will depress the plunger 7 3 against the resistance of its spring, until the d sk 55 is rocked suliioiently tobring. its roller 83 beyond the apex of the cone end 79 of said plunger, whereupon the previously energized plunger spring will dischargeand project toward said disk55, and cause the roller 83 of the latter to pass from'th'e apex of the cone end 79 toward the lower edge of the base of said cone end. This will further rock thedisk 55 and cause itstonguez i'f' to engage the eccentric lug 51, shiftthe rod 35 to the right of F1gr3, and cause the spool clutch to disengage from the gear 23 and, engage the gear 27. This will reverse the feed of the the rod to the right onthe reversing of the feed, and the previous adjustment of the eccentric lug 49 along said rod to the right thereof, brought said lug to a point adjacent the depending tongue 47 of the disk 55. As a result, the rocking of said tongue on thepassing of the disk roller 83 from the lower edge of the base of the cone end 7 9 to the apex thereof causedsaid tongue toengage said eccentric lug 49 and move the latter to shift the rod 35 to the left of Fig. 3, and move the clutch spool to its mid position out of engagement with either of the bevel gears 23 Or 27 and as a result arrest the feed of the table. The disk will be prevented from over-rocking and throwing the clutch spool beyond its mid-position by the seating of the wedge end 101 of the spring finger 99 into the V depression in the elevation 103 of the rod guide 37, and the seating of the disk roller 83 in the slight depression on the apex of the cone end 79. Then the table has completed its travel to the left of Fig. 3, the tongue 47 has rocked to the right into engagement with the eccentric 51 and remains in this position until on the return travel of the table to the right of Fig. 3, the roller 71 engages the arm 61. Thus the tongue is a sufficient distance from the eccentric 49 to allow the roller 83 to pass from the lower edge to the apex of the plunger 79, without'going beyond said apex. Of course the. roller 71 does not move'beyond the arm 61 in this operation. I Any number of reverse cuts and arrests, such as just described, may be made without any other adjustment of the device than the means? shifting of the handle to the le ft to start the clutch handle amt the" rightof said figure (the' direction of desired table feed),- the enemy be ad to are right ofFig. 3, automatically reversed, and automatically stopped While one embodiment of the invention has been'sel'ected for purposesof illustrating the invention,it will beunderstood that various modifications may be made without departing from the scope ofthe' claims. ,l Vhat I clalm asnew *and de'sn-eto secure by LettersPatent 1s:- 1." A devieoftheclass described comprising, in combination, a work support; a rocklng member having oppojsltelyinclined arms, projecting therefrom; 'dog's carried by said support and adaf'ted'jto engage' said arms; a feed shift rod; anda spring pressed plungeradapted to lie-energized by the'rocking' of said member to 'shiftsaidrod'. 2. A' device of the'class" described comprising, in combination, 'a work: table; a" feed shaft therefor; gears-loose on'the' latter; a shift clutch for' connecting one orthe ether of said gears to "said 'shaftfarod connectedto said'clut'ch; spaced lugs on said rod; a rocklngmember forengagementwith oneo-r another'of said lugs to shift'said rod; "a spring"pressed plunger engaging said member pro'jection's 'on' said member 5' v and dogs on said tableIfOr rocking'sal'd memher in oppositedirections to erier 3;ize "saidplunger andca'use th'e 'latter" to rock said memb'erto shift saidclutch." 3. A feed reversingdevice comprising, in combination, a Work support {feeding means therefor; ajspriiigpressed plunger; rod having lugs thereon; and a member moved by travel of said' support 'tojenergize said 1 plunger and then engage one or another of said lugs" and shift said rod to reverse said feeding means. i. A feed reversing device comprising, in combination, a worktable; a shaft; oppositely ret'ative feeding gears loose thereon a clutch for connecting onefor'another of said gears to said shaft; clutch actuating m.eans,'a rocking member; dogson said table" for rocking said member" on movements ofsaid table; and eccentrics on said means for varying the throw of said clutch. 5." A feed reversing device comprising, in combination, a wo'rk table; a basetlierefor; adjustable dogs on 'said table; feeding devices for said table; a rocking tongue disk 7 pivoted on said table'b aseya rod adapted to he slid in opposite 'directionsby the en gagement'of the tongue of said disk there ing adapted to be pressed against the resistance of its spring on the travel of said disk roller on one incline of said Wedge and adapted to be effective to rock said disk, When said roller passes the high point of said Wedge, to slide said rod to actuate said feeding device and change the direction of feed of said table. 6. A feed reversing device comprising, in combination, a bed; a Work table thereon; means for feeding said table relatively to said bed; a spring pressed plunger and a rocking member both mounted on said bed; a feed reversing clutch, said plunger and rocking member cooperating on rocking of said member by said table to shift said clutch and reverse the feed and locking means for preventing said plunger from cooperating with said rocking member. 7. A feed reversing device comprising, in combination, a support; feeding means therefor, including a shaft andgears oppositely rotative thereon; a clutch for connecting one or the other of said gears to said shaft; a spring pressed plunger having a tapered end; a rocking member formed to slide over said end, said member being rocked by the travel of said support in one direction to and beyond the apex of said end to energize said plunger and permit the latter further to rock said member and shift said clutch from one of said gears to the other to reverse the feed; and means for automatically stopping said rocking member at the apex of said plunger on the feed of the support in an opposite direction'to shift said clutch out of engagement With said gears and thereby arrest the feed of said support. 8. A feed reversing device comprising, in combination, a support; feeding means therefor, including a shaft and gears oppositely rotative thereon; a clutch for connecting one or the other of said gears to said shaft; a spring pressed plunger having a tapered end; means adapted to pass over oppositely inclined surfaces of said tapered end, said means being movable over both of said surfaces on the feed of said support in one direction to shift said clutch from one of said gears to the other, and said means being adapted to pass over but one of said surfaces to shift the clutch into. a neutral position out of engagement with both of said gears to arrest said support on the completion of its feed in an opposite direction. 9. A feed reversing device comprising, in combination, a support; feeding means therefor including a shaft and gears oppositely rotative thereon; a clutch for connecting one or the other of said gears to said shaft; a spring pressed plunger having a tapered end presenting opposed inclined surfaces; and a rocking member having a pore tion formed to ride over said surfaces, said member being rocked by the travel of said support over saidapex on the travel of said support'in one direction to'shift said clutch to reverse the feed, and said member being rocked to said apex on a subsequent feed of said support in an opposite direction to shift said clutch to a position out of engagement with both of said gears and thereby automatically arrest the feed. 10. A feed reversing device comprising, in combination, a support; feeding means therefor including a feed reversing clutch; and means for shifting said clutch comprising a member moved by said support on the travel of the latter in one direction to reverse the feed thereof; and adjustable means adapted to be set at vvillto automatically limit the movement ofsaid member and permit the latter to shift said clutch to a position to automatically arrest the feed of said support on the completion of the feed of the latter in an opposite direction, or be set to automatically reverse the feed. 11. A feed reversing device comprising, in combination, a support; a base therefor; feeding means for said support; and controlling means for said feeding means comprising a member pivotally mounted in said base; a spring pressed plunger adapted to be energized on the rocking of said member; and adjustable means adapted to be set to permit said plunger to be energized and discharged by said member on the travel of said support in one direction to reverse the feed, said adjustable means being adapted to be set to automatically arrest said member in a position to energize but prevent dis-f charge of said plunger on the travel of said table in an opposite direction to arrest, the feed of said table, or be set to automatically reverse the feed. 1 12. A feed reversing device comprising, in combination, a bed; a table thereon; dogs on said table; a member pivoted on said bed and adapted to be rocked by the engagement of one or the other of said dogs therewith; a spring pressed plunger mounted on said bed adjacent said member, said plunger having a tapered end adapted to be engaged by said member; a rod having lugs thereon adapted to be engaged by said member; a clutch adapted to be shifted by saidrod; a shaft and oppositely rotative gears thereon adapted to be connected by said clutch to said shaft to reverse the feed of said table. 13. A feed reversing device comprising, in combination, a bed; a table thereon; a shaft; oppositely rotative gears on said shaft; a clutch for connecting one or the other of said gears to said shaft; and'controlling means for shifting said clutch comprising a rod having lugs thereon, a rocking member pivoted to said bed and having a tongue projecting bet een said lugs; a spring pressed plunger mounted on said bed and dogs on said table for alternate engage ment with said member whereby to rock the latter, energize said plunger and permit the latter to discharge and further rock said member, slide said rod and shift said clutch to reverse the feed. 14. A device of the class described comprising, in combination, a support; means for feeding the same in opposite directions, and controlling means for said feeding means having automatic means for arresting said support after the latter has been fed in either direction and in a reverse direction. 15. A device of the class described comprising, in combination, a support; means for feeding the same in opposite directions; and controlling means for said feeding meansincluding a spring pressed plunger and means caused by'said support to wipe over the end of said plunger to energize the same, said meansbeing adapted-to then be actuated by said plunger to reverse the feed of said support, and means to maintain said plunger in its energized position whereby the'feed is automatically arrested. 16. A device-of the class described comprising, in combination, a support; -means for feeding the same in'opposite directions; and controlling means 'for said feeding means including an element moved by said support in the course of travel of the latter, and'meansactuatedby said element for reversing the feed when in one position and adapted to be adjusted to aposition to automatic'all'y arrest the feed when'actuated by said element. "'17. A device of the class described comprising, in combination, a support; 'means for feeding the same in opposite directions and controlling means 7 for said feeding means including a .rod; spaced, adjustable means on said rod, and actuating means interposed between said adjustable means and adapted to be moved by said 'support'to engage one or another of said ad ustable means and shift said rod to reverse the feed, saidadjustable means being adapted tobe set in positions toc'ause said rod to be moved to arrest the feed. ' 18. A device of the class described comprising, in combination, a support; dogs thereon; feeding means for said support, and controlling means for said feeding means comprising a clutch and means intermediate said dogs and said clutch and adapted to be engaged by said dogs for shiftin said clutch, said intermediate means being constructedand arranged to permit said dogs to pass the same aftenbeing moved thereby. 19. A device of the class described comprising, in combination, a support; dogs thereon; feeding means for said support, and controlling means for. said feeding means comprising a shiftable clutch, and arocking member engaged by said dogs to shift said clutch, said rocking member being adapted to permit said dogs to wipe past the same after being actuated thereby. 20. A device of the class described comprising, in combination, a bed; a table thereon; dogs on said table; feeding means for said table; and controlling means for said feeding means comprising a clutch, a spring pressed plunger mounted on said bed and having a tapered end, a rocking member having a portion adapted to move over said tapered end, said member having a pair of arms, one or another of the latter being adapted to be engaged by said dogs to rock said member to energize said plunger and then render said plunger effective to further rock said member and {shift said clutch to reversethe feed. 21. A feed reversing device comprising, in combination, a bed 5; a table 7 thereon; dogs 63 and 71 on said table; a feed screw 13 for said table; a clutch; means controlled thereby for changing the direction of rotation of said screw; a rod 35 connected to said clutch and mounted to slide on said bed; lugs 49 and 51 on said rod; a member 55 pivoted on said bed'and having a tongue d7 projecting between said lugs; arms 59 and (don said member adapted to be engaged by said dogs and a spring pressed plunger -73-co6perating with said member 55 for shifting said clutchto control the feed. 22. A feed reversing device comprising in combination, a rocking member. with provision for operating the same by movement of a table; a clutch shifting member actuated by said rocking member and having elements thereon adjustable to different positions for reversing or arrestingthe feed; and means for assisting the operation of said rocking member. I 23. A feed reversing device comprising, in combination, a clutch shifting member, a rocking member having provision for pivotal connectionwith a table base for transmitting movement from the table to said clutch shifting member on the engagement of table feed dogs therewith, and meansrcooperating with said transmitting member for arresting or allowing continuation of the movement thereof. 3 In testimony whereof, I have signed my nameto this specification, in the presence of two subscribing witnesses. i JOHN BECKER. Witnesses: HENRY T. \Vi LiAus, RoBnR'r H. KAMMLER. Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. (3.

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