Патент USA US2409777код для вставки
Oct. 22, 1946. J, A, MAPLES - ’ 2,409,776 JIG FOR TRIMMING BOILER TUBES Filed 001;. 18,‘ 1943 I . ‘Inn: _ ///0,.\\ ' - , INVENTOR. Jakrzd?fapéai %2a,% 422% -BY Patented Oct. 22, 1946 » 2,409,776 ounce STAT ES 1 PATENT ~ omce 2,409,776 , no Foe TBIMMING‘ some roses John A. Maples, Sturgeon Bay,‘ Wis., assignor to Leathem D. Smith Shipbuilding ,‘Co., sturgeon‘ ~ Bay, Wis, a corporation of'Wis'consin Application October is, 1943?, Serial No. 506,715 ‘ 1 3 Claims. (01.299105) , 2, vFig. 3 is a transverse sectional view taken in a The present invention relates to jigs or similar device for ‘machining, as trimming or cutting, the ‘ena- of boiler tubes after they have been inserted th‘roughfa boiler sheet or plate, and before the rolling or spinning of the ends of the tubes against theboiler sheet or plate. planerepr'esented by line 3-3 in Fig. l or ‘the drawing; ' ‘ , ' Fig. 4 is a longitudinal sectional view of the tool and a part of the tube and boiler plate at a starting stage of operation; and, ' I Fig. 5 is a similar View showing the ?nal ‘stage When tubing a boiler, the tubes are inserted of‘ operation. hrough the holes in the boiler sheet or plate Referring more in detail to the drawing the with ‘an end portion of the tubes extending or particular embodiment chosen to illustrate the 10 projecting beyond the surface of the plate. The invention is shown as comprising a cylindrical protruding end portions will vary in length and body or chuck I having at an end thereof an will'be ‘more ‘or less irregular or rough. vIt is de axially extending rigid shank 2 provided with a sirable ‘and essential ‘that such protruding end coupling portion 3 which may be squared, ?uted, portions ‘of the tubes all be alike, that is, all of or the like, for coupling to a portable driving equal ‘length, and also ‘that the ends‘of the tubes unit ‘(not shown) such as an air motor or an elec be 'eVen and square, that is, at right angles to the axes‘of the tubes. ‘ tric motor, or'the like, an example of‘su’ch a motor being that usually used for portable drills ‘and the like. At the other end the chuck I has an ‘ ng the ‘objects of the invention is to pro vide a ‘novel tool or jig for machining or trimming 20 the protruding end portions of boiler tubes in a boiler ‘sheet or plate ‘to ’a de?nite and predeter mined length, and to a properly and desired ?n ished end form, for the later efficient rounding or ‘spinning of thejen‘d portions of the tubes. ‘It axially extending rigid spindle or arbor 4 having a ‘cylindrical body portion 5 adapted to fit and slide ‘in an end portion of the boiler tube 1 ‘so as to‘ guidethe jig or tool axially with respect to;the tube 1, thespindle or arbor 4 also having comprises‘a‘chuck for holding‘ cutters for’ cutting 25 a‘ftapered endportion S for affording a facile entrylof the spindle or arbor 4 into the ‘end of or ‘trimming the “ends of the tubes, ‘the cutters the tube 1 when applying the tool or jig in place being adjustable ‘in the chuck and adjustably set for-trimming the end of the tube 1. in‘adjusted‘positionfor the desired ?nished length The body or‘ chuck i also has a plurality of of the ‘protruding end portions of the tubes ‘be axially extending cutter sockets 8, arranged con yond the boiler ‘sheet or plate. It also preferably centric with theaxis of the tool or jig, for ‘recep has a'gauge stop "with ‘reference to which the' tion of cutters 9, these cutters being shown as cutters are “initially adjusted as desired, and square or rectangular ‘in cross section and being which, when the cutting‘ operation progresses, will provided at their forward ends with bevels ‘H3 contact or abut ‘the boiler plate‘or sheet and thus automatically stop jfurther cutting or trimming 35 running to. cutting edges ll. The cutt’ers 9 are held “in- place by suitable setscrews l2, such as o‘i'the ‘end portion of the tube and thus determine the ‘type known as the Allen setscrews, having thedesired length "of ‘the protruding end portion of the tube. ,_ ‘ ‘ I , wrench sockets ‘l3 I(see Fig. 1), these setscrews being‘threaded into suitable radially extending _ A ‘further object of the invention is to provide a novel ‘jig of the character'described and, which has'a ‘guiding arbor or spindle ?tting into the tube to be out, which arbor maintains the jig coaxial 40 threaded bores l4 provided in the sides of the chuck l and extending to the cutter sockets ‘8, so that the setscrews may bind against the sides‘ of r the cutters 9 and hold them in adjusted and se with the tube and the cutters square so that the lected position. end of the tube will be cut square or at a right At the forward end of the chuck l is provided a 45 angle to the axis of the tube. ?ange i5 which acts as a gauge stop when it Also, the invention comprises the provision of contacts the boiler plate or sheet l6 (see Fig. 5) a novel means provided with openings adjacent so as to stop the cutting or the trimming of the the cutting locus for affording a free and direct end I‘! of the boiler tube 1 (see Fig. 5) at the escape of the chips or trimmings or cuttings to the exterior of the jig during the operation there 50 gauged distance, for the later rolling or spinning of the end ll of the tube 1. of. ' As the tool is rotated or turned about its axis Other objects, capabilities, advantages, fea the cutting edges ll of the cutters 9 will cut tures, and the like, are comprehended by the in chips or shavings or cuttings or the like from the vention as will later appear and as are inher end of the tube ‘I, and for the purpose of afford ently possessed bythe invention. ing a free escape of these cuttings the ?ange Referring brie?y to the drawing: Fig. 1 is a side View of a jig constructed in accordance with the invention; Fig. 2 is an end view taken from a plane rep’ resented by line 2-4 in, Fig. 1 of the drawing; portion 15 is provided withradially extending escape passages 18 communicating with the an nular space I9 between the arbor l4 and the ‘flange l5 and at or adjacent the cutting ends of > 2,409,776 3 the cutters 9 and with the exterior of the flange I5, so that the cuttings will be free to move through the escape passages l8 directly from the cutting loci to the exterior of the chuck I. The inner ends 20 of the passages l8 intersect the forward end of the chuck l adjacent to the cutter sockets 8 and at the inner or rear end of the annular chamber I9 where the forward ends of the cutter sockets 8 terminate. , 4 drawing shown an illustrated embodiment of the invention it is to be understood that the in vention is not limited thereto but comprehends other constructions, details, arrangements of parts, features, and the like, without departing from the spirit of the invention. Having thus disclosed the invention, I claim: 1. A jig for trimming the end of a boiler tube projecting through a boiler plate comprising a In use the cutters 9 are ?rst adjusted in the 10 cylindrical casting having upper and lower end chuck I so that the cutting edges II will be at a faces and having a coaxial arbor extending from given or predetermined distance from the for the lower end face, said arbor having a sub ward end of the gauge stop I5. This distance stantially smaller diameter than the lower face will be equal to the desired length of the end I‘! of the tube 1 (see Fig 5) beyond the boiler plate 15 and a slightly smaller diameter than the inside diameter of the boiler tube to be trimmed, an I6 when the end of the tube has been cut or annular recess in the lower, end face adjacent trimmed to the point when the gauge stop l5 the arbor resultantly forming a downwardly contacts the boiler plate [6. The setscrews 12 directed annular ?ange therearound, a socket are then set against the cutters 9. In operation the jig is coupled to a suitable 20 in the casting parallel with the jig axis and opening into the recess, and a cutter adjustably driving motor, and, being portable, the arbor 4 mounted in said socket. is introduced into the protruding end ll of a 2. A jig for trimming the end of a boiler tube boiler tube 1, as shown in Fig. 4. The cutters 9 projecting through a boiler plate comprising a are thus in contact with the end I’! of the boiler cylindrical casting having upper and lower end tube 1 as shown in Fig. 4. The cutting edges ll 25 faces and having a coaxial arbor extending from of the cutters 9 are maintained at a normal, the lower end face, said arbor having a sub that is, at right angles, to the tube 1 by reason stantially smaller diameter than the lower face of the cylindrical portion 5 of the arbor ?tting and a slightly smaller diameter than the inside closely in the tube 1 and being coaxial therewith. diameter of the boiler tube to be trimmed, an The operator presses the tool forwardly against the end of the tube 7, and closes the circuit of 30 annular recess in the lower end face adjacent the arbor resultantly forming a downwardly the driving motor, so that the tool is caused to directed annular ?ange therearound, a socket in revolve about the axis of the tool and of the tube the casting parallel with the axis of the jig and 1 to trim or cut off chips or like cuttings from the opening into said recess, a cutter mounted in end of the tube 1. When the tool has pro gressed in its cutting or trimming operation to 35 said socket so that its cutting edge is inside the recess, and an opening through the Wall of the the point when the gauge stop l5 contacts or casting into the recess adjacent the cutting edge abuts against the boiler sheet or plate It, further of the cutter. cutting of the tube is prevented, even though the 3. A jig for trimming the end of a boiler tube tool may continue to rotate. The cut end of the 40 projecting through a boiler plate comprising a tube 1 is square, that is, at right angles to the cylindrical casting having upper and lower end axis of the tube 7, and the length of the tube faces and having a coaxial arbor extending from end I‘! is that of the desired and given magni the lower end face, said arbor having a sub tude for a proper later rolling or spinning of the stantially smaller diameter than the lower face tube end i’! against the boiler sheet or plate l6. and a slightly smaller diameter than the inside By the present invention, after the cutters 5 .diameter of the boiler tube to be trimmed, an have been initially set for a given distance, as annular recess in the lower end face adjacent explained above, the amount of stock left at the the arbor resultantly forming a downwardly end of the tube 1, beyond the plate I6, is con trolled automatically. With this device it has 50 directed annular ?ange therearound, a plurality of passageways in said casting parallel to the axis been found that when tubing a boiler having of the jig and extending from the upper end face approximately 1600 tubes, there is a saving of through to the recess, elongated cutters disposed about Soil man hours of labor, over the work and in said passageways with the cutting edges in the time required by other existing and known annular recess, means for holding each cutter operations. Also, the tool automatically clears itself of the, chips and the other cuttings or -, against axial movement, and openings through the casting into the recess adjacent each cutting trimmings as fast as they are produced. edge whereby chips may escape from the recess. While I have herein described and upon the JOHN A. MAPLES.