Патент USA US2412859код для вставки
Dec. 17, V1946. 2,412,859 GJA. BARNES SEAT DRESSING TOOL -Filed Oct.. 15., 19,45 ¿2g/2839.40" _ _ v '2,412,859 Patented Dec. l?,` 1946 UNITED STATES . PiISfIÍlEZNTk OFFICE 2,412,859V SEAT `DRESSING 'I‘QOL Galen A. Barnes, Indianapolis, Ind. Application October 15, 1945, Serial No. 622,295 9 Claims. (Cl. 51--l31) 1 Z. housing I3 has a shaft-bore I 5 and a larger bore I4‘ for the reception of a bearing I5. The rotor shaft `i'I is mounted in the bearing I5 and carries at its inner end a pump rotor I8. In common practice, the outer end of the shaft I1 carries a sheeve 20 for a driving belt, and This invention relates to a tool for dressing the seat of a shaft-seal, for example of the seal around the driving shaft of an automobile water pump. In water pumps commonly used on automobiles, and in many analogous situations, a shaft open-` may also Vcarry a fan. To seal the pump around ing is sealed by a sealing disk rotatable with the the shaft Il, a sealing disk 2l carried by the shaft and yieldingly urged axially against an rotor I8 and sealed with respect thereto by a annular seat on the housing. The seat must be 29, is pressed by a spring 28 against fiat, true, and perpendicular to the shaft axis, 10 bellows a seat 2B on the shaft housing. Conveniently, and must have a smooth surface. In a water the spring 23 lies around the bellows 2S), in a ' pump, the seat is surrounded by other parts of the' housing, and its inaccessible location makes Acup 25 in the rotor. Lugs 3D on the sealing disk it extremely difñcult to dress, save with expen sive factory tools not practically availableV for repair work. In consequence, when such a seat 2l engage notches 3i in >the rotor it, to cause the disk 21 to turn with Vthe rotor ißt. The seal seat 2B is formedas „an annular ñat 15 on a bess 32 projecting inwardly around the shaft l?, a plane normal to the. axis _of the is damaged, even though but slightly, it is prac tically necessary to discard the whole housing. shaft `Z'I, and generally concentric with that axis.L It is the object of this invention to provide a simple inexpensive tool lwhich will be practical 20 It thus lies ncrrnal to, and concentric with, the for repairing such seal-seats. shaftrbore tliiiand the bearing-bore I4. ` For dressing the seat 26, the tool shown in In carrying out my invention, I provide a cylindrical head to be mounted for relatively high Figs. 2 and`3‘ comprises _a head '3.5 adapted to be mounted on a driving shaft 36, conveniently speed rotation on any available standard shaft, a standard one-half inch shaft of an electric conveniently a standard half-inch 4electric-‘motor 25 motor or of an arbor. The rotor 35 is formed to shaft. At its forward end the head carries 4an provide a shoulder _JI to receive an annular interchangeable tool which >provides a dressing facing tool 38. This is desirably formed of metal face perpendicular to its axis of rotation. An eccentric which rotatably Vfits a .bore in the pump case and which `is rotatable with respect to the head, is positioned by a pilot shaft with its axis of eccentricity coaxialwith the head axis. The eccentric will supporta housing with its seal-seat in proper position for dressing against the dressing face .of the tool; axial plîe‘SSllre can be applied manually; and manual rotation .of the eccentric will carry the seal seat in‘an ec centric path over the face of the rotating tool, to give adequate relative movement to ensure effective dressing of the seat to the desired ñat, true, and smooth condition. The accompanying drawing illustrates my in vention. In such drawing, Fig. 1 is an axial section through a typical shaft seal, shown in association with a water pump; Fig. 2 is an axial section showing a preferred form of my tool in position to dress the seat of the seal shown in Fig. 1; Fig. 3 is an end elevation of the tool shown in Fig. 2; and Fig. 4 is an axial section showing a modified embodimentfof my invention. My tool is adapted to dress the seat of a shaft seal such as that of the water pump typified in Fig, 1. That water pump comprises .a case I0 formed to provide a rotor housing II, an inlet passage I2 and a shaft-bearing housing I3. The 30 and faced with a renewable abrasive disk 39. The facing tool §13` is conveniently replaceable, as by being held in place by a snap ring 45 and provided with a hole 4I to engage a driving pin 4_2 on the rotor 35. A pilot .45 projects forwardly from the rotor 3,5 coaxial therewith, and is re ceived in an eccentric sleeve 5€) which rotatably ts a bore in the fhousing I9, Vco_riveniently the bore I4 in that boss I3. ',I‘he sleeve 5I] is _proÍ vided with a manually Operable handle 5I. In use, the head 35 is mounted on a shaft 3B to rotate about a fixed axis. A facing tool 38 is placed on the head 35 against the shoulder 31, and a pump case IE! is then placed in the position shown in Fig. 2, with its seal-scat 26 against the abrasive face 39. The eccentric 5i] ' is then inserted in the bore Ill around the pilot 45, which ñxes the common axis of the head 35 and pilot 55 parallel to the bore I4 of the pump case III, and hence perpendicular to the seat 2S. With the casing Ill manually held against rotation and pressed axially, the head 35 is rotated at high speed, and the handle 5I is operated to rotate the eccentric 50 to carry the casing in an eccentric orbital path about the axis of eccentricity of the eccentric 55. The working face 39 is thus rotated at dressing speed 2,412,859 3 . against the seal-seat 26, while the seat 216 is translated through a circular path about the axis of rotation of the working face 39. This causes, between the seat 26 and the working face 39, a simultaneous rotation and relative movement in an eccentric path, to dress and true the seat 26. When it is desired to change the working sur face 39 during the course of the operation, the tool 38 may be removed by sliding it oli the end of the pilot 4-5 and replacing it with one which has a face 39 of the desired characteristics. In the modification of Fig. 4, the pilot d5 is carried by the eccentric 59 instead of by the head 35, and the head 35 is bored to receive the no-w inwardly projecting end of the pilot 45; In this case, the tool 38 is provided with a rim 53 to engage a snap ring 5t carried circumferen tially on the rotor 35. Preferably, the tool is provided with a plural ity of eccentrícs 50 having outer surfaces of dif ferent diameters, to adapt the tool to use on dif ferent casings. For a large majority of automo bile water pump seals, because of standardization, one size of eccentric 5G will be suiiìcient, and ec centrics 5l) of two sizes will adapt the tool to substantiallir all of the water pumps now in use. The tool of this invention is simple and inex pensive, so that it may readily have wide avail ability in repair shops. It will effectively dress 4. housing perpendicular -to and generally concen tric with a bore in said housing, comprising a head rotatable at dressing speed, an annular tool there on providing a Work-surface perpendicular to the axis of head rotation, a pilot coaxial therewith, an eccentric having a cylindrical outer surface adapted to rotatably ñt said bore, and a handle for rotating said eccentric to cause relative revo lution between the bore axis and the common axis of the pilot, head, and tool. ‘ ‘ " " ‘ `5.11151 seat-dressing tool as deñned in claim 4in which the pilot is integral with the head and is . rotatably received in said eccentric. 6. A seat-dressing tool as defined in claim 4 in which the pilot is integral with the eccentric and is rotatably received in said head. ' 7. A device for dressing an annular seat on a housing perpendicular to and generally concen tric with a bore in said housing, comprising a head rotatable about a iixed axis, a shoulder on said rotor, a pilot extending beyond said shoulder and coaxial with said rotor, an annular tool re placably received about said pilot and against said shoulder, means for holding said tool in driving relationship against said shoulder, an eccentric to rotatably ñt said pilot, said eccentric having a cy lindrical surface eccentric with respect to the axis' of said pilot and adapted to rotatably ñt said bore, and means for rotating said eccentric. and true the seats of water pump casings. It thus 30 8. A device for dressing an annular seat on a makes it possible to continue in service many wa housing perpendicular to and generally concen ter pump casings which under the present prac tric with a bore insaid housing, comprising a head tice must be destroyed. I’claim as my invention: ' ' 1. A device for dressing an annular shaft-seal seat surrounding the shaft bore of a water-pump case and concentric with said bore and with the coaxial bearing-receiving bore of said case, com prising a head rotatable at >dressing speed on a ñxed axis, an annular tool thereon providing a rotatable about a ñxed axis, an annular tool re placably received on the end of said head and 35 providing a work-surface perpendicular 'to said axis, means for holding said tool in driving rela tionship on said head, an eccentric having a pilot coaxial with its axis of leccentricity and having a cylindrical outer surface adapted to rotatably 40 iit said bore, said head having an axial bore tore radial work-surface, a pilot coaxial therewith, an ceive said pilot, and means for rotating said eccen? eccentric positioned by said pilot with its axis of tric. eccentricity coaxial with said head, said eccentric 9. A device for dressing an annular seat on a having an outer cylindrical surface rotatably ñt housing perpendicular to and generally concen ting said bearing receiving bore to support said tric with a bore in said housing, comprising a pump case with its shaft-seal seat against said ‘ head rotatable at dressing speed, a dressing face work-surface inposition to be dressed true, and a carried by head and disposed radially with respect crank on said eccentric whereby it may be rotated to the axis of head rotation, a pilot coaxial with in said bearing-,receiving bore to carry the axis said head, an eccentric positioned by said pilot thereof and the center of said seat over an ec- . with its axis of eccentricity alined with said axis centric path of revolution about the axis of rota of rotation, said eccentric having a cylindrical tion of said tool and head. , outer surface to rotatably ñt said bore whereby 2. A seat-dressing tool as defined in claim 1 in to position said housing with said annular seat which the pilot is integral with the head and is in position for dressing against said face, and rotatably received in said eccentric. *means to rotate said eccentric to cause relative 3. A seat-dressing tool as defined in claim 1 in revolution between the bore axis and the common which the pilot is integra1 with the eccentric and axis of said pilot and'head. is rotatably received in said head. = 4.' A device for dressing an annular seat on a ' GALEN A. BARNES.