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US2056483A - Valve seat grinding tool - Google Patents

Valve seat grinding tool Download PDF

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Publication number
US2056483A
US2056483A US669533A US66953333A US2056483A US 2056483 A US2056483 A US 2056483A US 669533 A US669533 A US 669533A US 66953333 A US66953333 A US 66953333A US 2056483 A US2056483 A US 2056483A
Authority
US
United States
Prior art keywords
shaft
stone
tool
valve seat
grinding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US669533A
Other languages
English (en)
Inventor
Henry C Preston
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Black and Decker Corp
Original Assignee
Black and Decker Manufacturing Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Black and Decker Manufacturing Co filed Critical Black and Decker Manufacturing Co
Priority to US669533A priority Critical patent/US2056483A/en
Priority to GB3472/34A priority patent/GB415951A/en
Priority to DEB164392D priority patent/DE653050C/de
Priority to FR769704D priority patent/FR769704A/fr
Application granted granted Critical
Publication of US2056483A publication Critical patent/US2056483A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B15/00—Machines or devices designed for grinding seat surfaces; Accessories therefor

Definitions

  • the object of the present invention is to produce a simple, efficient and relatively cheap machine which operates at high speed, cuts rapidly and gives the desired lifting of the cutting stone 35 from the seating surface. This operation is performed automatically at short intervals which are so timed as to keep the cutting uniform and true leaving the operator free to support and direct the machine and control its operation, pro- 40 ducing the highest quality of work with the least expenditure of time and effort.
  • the stone is driven directly from the armature shaft of a universal 45 motor at a speed of from 10,000 to 12,000 R. P. M., the tool spindle with the tool connected thereto being vibrated in the direction of its length as it is rotated, the timing'of the vibrations being in the preferred form automatically varied in its 55 surface, being formed. While'the speeds stated relation to the rotation of the stone.
  • the lifting are the preferred speeds, other grinding speeds may be employed.
  • the cutting 'stone may to the best advantage be mounted on a sleeve which is connected to the tool shaft by'a universal joint.
  • this de- 5 vice is employed, the tool is guided in its operationr by means of a pilot which is seated in the valve stem guides and extends upwardly through the stone and through the sleeve upon which it is mounted, the stone and sleeve being free to 10 slide up and down and rotate on the pilot.
  • Figure l is a fragmentary vertical central 15 cross section of the machine, certain parts being shown in elevation, the valve seat and storie being included.
  • Figure 2 is an elevation of the tool with 'the stone and shaft detached. 20
  • Figure 3 is an elevation of the tapered rings and balls.
  • the construction 25 shown comprises a portable power driven rotary tool l, which is preferably provided with a hand grip 2 convenient to which is a switch or other device 3 for controlling the operation of the tool.
  • This tool inthe preferred form of the invention 30 is electrically driven having a motor 4 mounted -in a suitable housing or casing 5 to which the grip 2 is secured.
  • 'I'he motor 4 is to the best advantage of the universal high speed type,'having a speed around 10,000 to 12,000 R. P. M. though these particular speeds and this particular type of motor are not regarded as essential to the operation of the invention, and other methods of effecting rotary motion of the cutting stone being available in this connection.
  • the armature lshaft 6 of the motor 4 is supported and guided in suitable bearings 'l mounted in an extension 8 of the frame or housing 5 and the motor as shown is cooled by means of a fan 9 which ⁇ may be utilized in any suitable manner.
  • the armature or motor shaft 6 is provided at its end Il remote from themotor with a cylindrical or other suitable socket I2-of the telescoping type, at the bottom of which is a slot i4.
  • the to'olshaft I5 50 is shown as mounted in suitable guide bearings I6 "at the lower end of the frame-extension 8 and in alignment with ythe motor or armaturer shaft 6 and this shaft I5 is provided at its upper end with a telescoping member I1 adapted to have a sliding 55 engagement with the socket I2, the tool shaft I5 being connected to the motor shaft 6 to rotate therewith by means of a tongue I8 which nts in the slot I4 at the bottom of the socket.
  • this telescoping connection may be effected in any suitable and convenient manner.
  • the tool shaft I5 in the form of the invention shown is suitably threaded and provided with lock-nuts I9 engaging the thread and bearing on a washer 20 which encircles the tool shaft, which shaft is preferably shouldered at this point and enlarged as illustrated.
  • a washer 20 which encircles the tool shaft, which shaft is preferably shouldered at this point and enlarged as illustrated.
  • two tapered cam rings 2I and 22 spaced apart by means of balls 24 positioned by means of a ball race or ring 25 or in any suitable manner, or any suitable antifriction means may be employed.
  • the upper tapered ring 2I bears on the bottom of the washer 20 and the lower ring 22 on the top surface 28 of the casing extension 8 where it surrounds the bearing I6.
  • and 22 are best illustrated in Figure 3 where they are shown in connection with the balls 24 and ball race 25.
  • 'Ihese rings preferably have a gradual taper from one diametrically opposite side to the other, the difference in thickness at the two diarnetrically opposite sides of each ring at the high and low points being about 1/64" in the form of apparatus illustrated.
  • the taper or inclination of the rings is exaggerated in the drawing for purposes of illustration as the actual inclination, if produced to scale, would hardly be visible.
  • the rings have a gradual cam action as hereinafter described, whereby all possible tendency to hammering or pounding is avoided.
  • a spring' I3 coiled about the lower end of the shaft 6 bears at one end against the bearing 1 and at the other end against the lock nut I9, imparting a downward tendency to shaft I5 and upper tapered cam ring 2l.. 'I'hus cam ring 2I is kept in contact with balls 24 and the latter are held in contact with lower tapered cam ring 22.
  • this ball 29 varies somewhat from the spherical, being of hexagonal cross section so that it has six tapered meridianal surfaces 30, though the details of this construction are not essential.
  • the ball member 29 as shown is connected to the upper portion of the tool shaft I5 by means of a reduced shank or neck 3 I.
  • the other or lower member of the unlversal joint referred to indicated by reference character 33 in the preferred form of the invention shown consists of a hexagonal cup secured to the upper end of the tool shaft or sleeve 34 which carries the cutting stone 35.
  • This grinder sleeve or shaft 34 is shown as provided with circular radially projecting fins or vanes 36 which assist in dispensing and radiating the heat which results from the grinding operation, in this way cooling the shaft, the stone and particularly the valve seat being treated.
  • a pilot 21 is secured in the valve guide in any suitable or preferred manner.
  • the portion of the pilot at 31 which projects above the valve seat has a running llt inside of thecentral bore 38 of the hollow shaft or sleeve 34 so that the sleeve 34 and stone 35 move freely up and down on the pilot and rotate relatively thereto in the cutting operation, the stone being in this way centered relatively to the valve stem guide.
  • the valve In the operation of resurfacing or grinding valve seats, the valve having been removed, the pilot is'placed in the valve guide and secured in any suitable manner as aforesaid with its axis in alignment with the axis of the valve guide.
  • the cutting stone 35 being rst attached to the shaft or sleeve 34, the cutting stone and sleeve are passed over the pilot as aforesaid, and the stone is engaged with the surface of the valve seat 39.
  • the ball 29 is then seated in and engaged with the hexagonal socket 33, the power operated rotary tool I being held by the operator in substantial alignment with the pilot, and the control switch 3 is pressed, energizing the motor whereby the stone is rotated at a suitable speed preferably around 10,000 to 12,000 R. P.
  • the tool shaft I5 receives a very slight vibrating motion in the direction of its axis at a speed which in the form shown is more or less irregular in its correspondence with and preferably differs from the speed of rotation of said shaft.
  • the connection of this shaft to the grinder sleeve 34 due to the friction of the ball 29 in the socket 33 gives a corresponding lifting of the stone from the seat in the nature of a vibration of the stone into and out of contact with the valve seat.
  • rings 2I and 22 have been described as having a frictional engagement only, the ring 2I with the shaft I5 and the washer 20, and the ring 22 with the casing surface 28, these rings may within the scope of the invention be secured respectively, the ring 2I to the shaft I5 or washer 20 and the ring 22 to the casing surface 28 so as to give a definite motion of one relatively to the other ln exact correspondence with the speed of the shaft I5.
  • 'I'he arrangement of the rings as described whereby they are more or less free to drift relatively to the shaft and cam, respectively is, however, found to contribute to the absolute accuracy of the result, and is regarded as the preferred form of the invention.
  • the spring and the gradual motion of the cam rings mosaics prevent vibration of the tool and hammer of the stone on the valve seat.
  • the spring may be located and applied in any suitable manner.
  • the lifting of the stone from the valve seat surface on which the grinding operation has been performed has the effect of releasing the particles of stone and steel which are separated from the cutting stone and the valve seat, the rotary motion ofthe stone causing these to be thrown outwardly from the seat and stone.
  • the cutting surface and the seat surface are cleared of this materiall overcoming any tendency to accumulation, otherwise the stone will load' up and give a poor surfacing job.
  • the drifting of the cam overcomesthe effect which might result from any irregularity of the shape ofthe stone and renders the cut absolutely true with the valve stem guide.
  • the invention is adapted for use in connection with a portable power driven electric tool ofthe high speed rotary type. though it is capableof-more general application.
  • valve seat grinding tool embodying the features of the invention in the preferred form, the description being specific and in detail in order that the manner of constructing. applying, operating and using thesame may be clearly understood, however, thespecific terms herein are used descriptively rather than in a limiting-sense, the scope of the invention being defined inthe claims.
  • a hand supported power driven rotary tool having a rotor and a yrotor shaft. of a continuously rotating tool shaft operated from the rotor shaft and movable longitudinally, means for vibrating the tool shaft in the direction of its length as it rotates, including means for-varying the relation of said vibrating means to the speed of rotation causing the vibrating action of vsaid shaft to bear-a varying relation to its speed of rotation, a grinder shaft, means for maintaining -said shaft in alignment with the valve-guides ofA an internal combustion motor, a valve seatl grinding -stonemounted on the grinder shaft and means connecting the tool shaft to the grinder shaft to operate said shaft to rotate the stone on the valve seat and lift it from the valve seat and return it thereto at varying intervals whereby the grit and metal dust produced in grinding are released and thrown off.
  • a hand supported portable power driven rotary tool having a rotating shaft, a continuously rotating tool shaft, a longitudinally extensible driving connection between said shafts, cam means and slip friction means for driving the same to periodically vibrate the tool shaft in the direction of its length. as it rotates and for varying automatically the relation of the frequency of vibration to the speed of rotation, a grinder shaft, means for maintaining the shaft in alignment with the valve guides, a valve seat grinding stone mounted on the grinder shaft and means connecting the tool shaft to the grinder shaft to rotate the stone and lift it from the valve seat at intervals corresponding to the speed of vibration.
  • the grinder shaft having means for centering the stone relatively to the valve guides.
  • a valve seat grinding tool having a rotor, a rotor shaft, a tool shaft having a longitudinally extensible driving connection with said rotor shaft, cam rings encircling the tool shaft. the adjacent surfaces of the y rings having a slight substantially uniform incline, antifriction meansv between said rings.
  • a-hollow cuttershaft, a valve seat grinding stone on the hollow shaft.. means for connecting the tool shaft to the cutter shaft. anda spring tending to advance the tool shaft holding the cams in engagement with the transmitting means, and a.. pliot within the hollow shaft.
  • a portable power driven rotary tool for grinding valve seats, of internal combustion engines and similar valve seats of a high speed universal motor having an amature shaft, a tool shaft with a guide bearing in which it is mounted to rotate and to slide in the direction of its axis, a telescoping driving connection between the tool shaft and the amature shaft, a plurality of tapered cam rings encircling the tool shaft, the rings being without positive connection to either the rotary or stationary portion of the tool, one having a frictional connection to and with the tool shaft and the other having a similar engagement with a stationary portion of the frame, a ball ring between the cam rings transmitting the thrust from one to the other, a coil spring applying a thrust to the tool shaft and the cam rings in the direction of the work, the rings being thereby rotated relatively to each other at a speed less than the rotation of the tool shaft whereby the tool shaft is vibrated in the direction of its axis, a hollow shaft adapted to receive a valve guide pilot in sliding and rotary engagement therewith
  • valve seat grinder a valve seat grinding stone and a shaft therefor, the shaft having projecting fins to radiate the heat from the stone incident to the grinding operation.
  • a valve seat grinding tool of a high speed driving rotor a rotor shaft, a tool shaft having a longitudinally extensible driving connection with the rotor shaft, tapered relatively rotatable cam rings encircling the tool shaft, a grinder shaft adapted to carry a valve seat grinding stone, a universal connection between the tool shaft and the grinder shaft, means for centering and aligning the grinder shaft with the valve seat, slip friction means for imparting to the cam rings a relative rotation which varies in its relation to the rotation of the stone serving to vibrate the grinder stone in the direction of its axis at intervals which are irregular in their relation to the speed of rotation of the stone, and a spring for taking up the vibration incidental to the operation of the cams.
  • a rotor means I for connecting a valve seat grinding stone to the rotor to be driven in rotation thereby at grinding speeds, means for vibrating the stone in the direction of its axis and controlling said vibrating means whereby said vibrations are caused to take place in varying relation to the speed ofA rotation of the stone, said vibrations serving to lift the stone from the seat and release the grit and metal dust which tends to accumulate between the stone and the seat.
  • a rotor means for connecting a valve seat grinding stone to the rotor to be driven in rotation thereby at a grinding speed, said means providing for motion of the stone in the direction of its axis into and out of contact with the seat and means for vibrating the stone in the direction of its axis and slip friction means for driving said vibrating means and causing the stone to vibrate with a frequency in indefinite and automatically varied relation to its speed of rotation.
  • a rotor means for connecting a valve seat grinding stone to the rotor to be driven in rotation thereby at a grinding speed, said means providing for motion of the stone in the direction of its axis into and out of contact with the seat and means for vibrating the stone in the direction of its axis in indefinite and automatically varied relation to its speed of rotation, said means comprising a cam member, and slip-friction means whereby it is engaged with the drive and an abutment cooperating with the cam to give said vibrating effect.
  • a rotor means for connecting a valve seat grinding stone to the rotor to be driven in rotation thereby at a grinding speed, said means providing for motion of the stone in the direction of its axis into and out of contact with the seat and means for vibrating the stone in the direction of its axis in indefinite and automatically varied relation to its speed of rotation, said means comprising a cam member and slip friction means whereby it is engaged to the drive and an abutment co-operating with the cam to effect said vibration, and anti-friction means between the cam and the abutment.
  • a rotor means for connecting a valve seat grinding stone to the rotor to be driven in rotation thereby at a grinding speed, said means providing for motion of the stone in the direction of its axis into and out of contact with the seat and means for vibrating the stone in the direction of its axis in irregularly timed relation to the speed of rotation of the stone, said means comprising co-operating rotary cam thrust members, with anti-friction means between them and slip friction means -driving one cam member at a reduced speed from the rotor and retarding the other cam member.
  • a portable power driven rotary tool having a longitudinally movable tool shaft and means for rotating said shaft, of means for vibrating .the tool shaft in the direction of its length as it rotates including means for causing the vibrations to take place in irregularly timed relation to the speed of rotation of the tool shaft, a grinder shaft, a valve seat grinding stone mounted on the grinder shaft, means for maintaining the grinder shaft in alignment with a valve guide and a. universal joint for connecting the grinder shaft to the tool shaft to be connected in rotary driving relation and to 5 yield in the direction of the axis oi' the grinder shaft with a frictional resistance to such yielding which resistance causes said lifting of the stone.
  • a rotor for connecting a valve seat grinding stone to the rotor to be driven in rotation thereby at grinding speeds, means for vibrating the stone in the direction of its axis including means whereby said vibrations are caused to take place in varying, 15
  • said vibrations serving to lift the stone from its seat and release the grit and metal dust which tends to accumulate between the stone and the seat,
  • the speed of rotation of the rotor being from 20 10,000 t0 12,000'R. P. M..

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
US669533A 1933-05-05 1933-05-05 Valve seat grinding tool Expired - Lifetime US2056483A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US669533A US2056483A (en) 1933-05-05 1933-05-05 Valve seat grinding tool
GB3472/34A GB415951A (en) 1933-05-05 1934-02-02 Valve seat grinding tool
DEB164392D DE653050C (de) 1933-05-05 1934-02-24 Ventilsitzschleifmaschine
FR769704D FR769704A (fr) 1933-05-05 1934-03-05 Outil à meuler les sièges de soupape

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US669533A US2056483A (en) 1933-05-05 1933-05-05 Valve seat grinding tool

Publications (1)

Publication Number Publication Date
US2056483A true US2056483A (en) 1936-10-06

Family

ID=24686681

Family Applications (1)

Application Number Title Priority Date Filing Date
US669533A Expired - Lifetime US2056483A (en) 1933-05-05 1933-05-05 Valve seat grinding tool

Country Status (4)

Country Link
US (1) US2056483A (de)
DE (1) DE653050C (de)
FR (1) FR769704A (de)
GB (1) GB415951A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103100961A (zh) * 2012-12-31 2013-05-15 苏州维赛克阀门检测技术有限公司 一种机械式喷嘴研磨装置
CN110871377A (zh) * 2018-08-28 2020-03-10 中核苏阀科技实业股份有限公司 小口径上装式球阀阀体研磨工装

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE938593C (de) * 1941-08-12 1956-02-02 Matra Werke Gmbh Antrieb fuer Ventilsitz-Schleifmaschinen
DE1023947B (de) * 1951-06-18 1958-02-06 Lewis John Howell Ballinger Antriebsvorrichtung fuer umlaufende scheibenfoermige Schneidwerkzeuge

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103100961A (zh) * 2012-12-31 2013-05-15 苏州维赛克阀门检测技术有限公司 一种机械式喷嘴研磨装置
CN110871377A (zh) * 2018-08-28 2020-03-10 中核苏阀科技实业股份有限公司 小口径上装式球阀阀体研磨工装

Also Published As

Publication number Publication date
FR769704A (fr) 1934-08-31
DE653050C (de) 1937-11-15
GB415951A (en) 1934-09-06

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