US2611220A

US2611220A - Surface grinding machine

Info

Publication number: US2611220A
Application number: US265369A
Authority: US
Inventors: Selby James
Original assignee: B Elliott and Co Ltd
Current assignee: B Elliott and Co Ltd
Priority date: 1950-12-01
Filing date: 1952-01-08
Publication date: 1952-09-23
Anticipated expiration: 1969-09-23

Description

Sept. 23, 1952 I SELHBY 2,611,220

' SURFACE GRINDING MACHINE Filed Jan. 8, 1952 3 Sheets-Sheet 1 In ventor :J'AMES, $51.5) B

A Home y Sept. 23, 1952 J. SELBY 2,611,220

SURFACE GRINDING MACHINE Filed Jan. 8, 1952 3 Shaw s-Sheet 2 F/GZ.

I n venfor JAMES $545) Sept. 23, 1952 L Y 2,611,220

SURFACE GRINDING MACHINE Filed Jan. 8, 1952 f a Sheets-Sheet s Attorney Patented Sept. 23, 1952 t I IT -o. israrjes PA -Eur;

2,611,220 v f BFA Q NG AG NEI f JamesSelby; Willesden, London, England, as signorto Elliott'& Company'Limited; Lon- I :domEnglandfi I. I q '1' v applicatibfljanu r 's, 1952 SerialNo. 265,369 A a 'i GreatBritain December-1,1950 v Claims: (Ciel--55):

The present,mvention'relates to surface grlnd "In order that 'the invention may befcle'arly ln'g machines; and concerns moreparticula'rly'the understood and readilycarriedinto practice; ameans for advancing, the grindingiltoolfin rela -j: surface grinding machine embodyingthe-invem" tion to the'surtaceofithe'work. The invention tion is illustrated, byway'of exampleonlyg in thhas for; its object: to provide forfnwre e fi tni 5 accompanying drawings, in which! control'of theadvancement'of the 1indlngito'01, Figure 1 is a'view'of-the machine in" verticalso asto" Permit 0ft grseor, fine adjustment sfiionl I v i thereof at will." if, 1 "if Figure 2'is a-"front' elevation o'f-the machine? The invention is applicable t'o'fany consfltrucf- Figural; is afsectional'view ir'trsection;to tion of surface grinding machineinjwhichthe' larger scale-ofthe fine adjustment" Ineclfiani'snfl grinding tool is advanced byirotation of ajfee'd 7 and its control means;an d

screw; adapted to' be operated by "manually'opr. Figures 4, Sand 6 are detail view erated meansfeitl'ier directly for, coarse adjust? larger scale, of the controlling sleevefi e i ment or through a reduction drive; at'will for Referring to the drawin s, the machi e co fine adjustment Thusthe'feed screw, ay be 1 prise's a base casting ion whichis'bolteda 'ped -ij positively-associated with a hand wheel or other estal or standard}, the upper. endofwhich carj operating member, which is operable to' give riesa radially extending'rotatabl head 3-,"fVer1-E coarse adjustment, and may'also'be associatedintically slidable on the pedestal ;zs-an arm 4jtc directly through a coupling'deviceand a ieducwhich isb'olted'a" casing 5 containin an electric tion drive. with an 'op'eratingl member for fine driving motor a, the shaft 1 or whic carrisfat adjustment, means being 'providedfor discojnnectitsjlowerv end the g inding member8, whichls; ing the reduction drive from the feed screw, when of cylindrical box or cup-like form: [The fmotorl it is desired tooperatethe coarse adjustmentfcasing" 5 carries a pair of ,spacedradialarms It will be appreciated that the reduCtiQl'i dri Ve between which is mounted a bar [0] to serv must operate the feed screw through a coupling, a hand-grip; whereby the arm 4 carryingfcasing; device, so that when coarse adjustment is desired 5 may be rotated angularly" about the pedestal 2 the feed screw may be freed from the control im during the grinding operation, I or whenever reposed by the reduction drive sothat itis neces-- quired. V sary to provide means for disconnectingthe re- Toprotect thesurface of'lthe'lower-Jpart'of the duction drive from the feed screw to permit; pedestal 2, a flexible sleeve 22vqf leather forZthe. coarse adjustment thereof. a n like, enclosing the said lower partfisifastried According tothe present invention therefore, between the base i and thelowerpar'tof, the-arm the reduction drive comprises a worm element 4 this sleeve being long enough,when extended; adap ed to be rfi a d by he fi e adjustm nt; to allow travel of the arm 4 to vthe upper endyof member, and a sin helical toothedgear wheel pedestal or standard-Land .collap'sing fin aim combined with acoup d c tq fgr anaxially certina'fashion as the arm r lrmoves downwardly; movable combined'memben which may be-moved. The vertical travel of the arm 4 on standard 2 to. engage with-0r disengagefrom a c0 mplemen is controlled (by the'feed screw. H, which is jourtary coupling member, carried by a member nalled-in the head 3 and passes through ascrew mounted on the feed screw. :1 j- 40 threadandbore in. arm y4,;bet,weentheistandard,

According to further features of the invention, 1: 2 and casing 5, The upper end f feed -j I,v the a al y movable Combined member has a carries a' hand wheelzlZ positivelykeyedithereto; part thereof engaged'withga slot in a rotatable by which screw may be rotated rapidlyjitol memberadapted to be t d y 3- mmgivecoarseadjustment of the position of thearm' her, so that rotation of said rotatable member 4 alongstan-d-ard [an-(11th Ofthedge r -s:

causes axial movement Of said POmbind niem' m B n l ti fi'it t i' u /t her. o causeengagement Or dlsengagemgnt of Workmountedbntable l3 onbasel. 'Thefeed the coupling means. The worm element is roscrewi| maya1so -aa smwiiana acg tatablefwithin the longitudinally slottedsleeve, which'constitutes' the rotatablemember by, means of which axialmovement of the couplinglmem 1 beriscontrolled;

'g In the construction of'the machine hereinafter rately'to'give ajmeasu'red adjustment or grinding member 8 iii-relation "to the ,w orkfbya'knobl: [4Q from the sidejof head-"j; close, to .fe'edfscrew I -II which lijsl positively mounted on'ashort' shaft '1 5? described the worm element is mounted, on "an (Fig' glfiarryipg? Q m -W is. fidn1fi operating "shaft; and is rotatable withinanensleve whichh-as lpngitudma-luslot. 1-1 circling sleeve, fitted into a bore in the machine P eng-agemenvtvoflthq wormvvl-s'with a single adjacent and atri'gh't' angles to the feed screw helical toothed gear [1 slidablel along the:.;uI P r.-; bore, d worm n aging through a slot in said shank; portionof: feed: screw J l -just;below .thel sleeve with a helical toothed "gear wheel'-coaxial d-iwheelll The hub. Ofthe'g'e'ar. h i111+ th e d screw; withwhich" it maybe drlv- Q is extended upwardly; and h'asEfQrmed integrally: may ou V l 2 I therewith, acoupling disc 18 having a ring-of holes I9, at thesame radius as'a coupling pin extending downwardly from the hub portion of hand wheel [2. Thus the combined gear wheel l1, and coupling disc I8, can be raised so that pin 20 engages in one of the holes I9 and thus a continuous driving connection is effected between the knob 14 (through wormlli and gear wheel l1, coupling pin 20, hand wheel l2) and feed screw ll. Under these conditions, therefore, the feed screw H can be given small adjustments which can be regulated uniformly with the aid of graduations on the hub piece of knob I4, and a zero mark 24 on the end portion of sleeve projecting from head 3. If however, the combined gear wheel. I1 and. coupling disc I8 are moveddownwardly, so that pin 20 is disengaged. from the coupling disc [8, the feed screw ll will be released. from the control of the worm drive, and freed for free-rotation by hand wheel I2.

- The. slotted sleeve 26- serves as the means for moving the worm Wheel 16 up or down, as may be'required, to bring coupling discl8 into or out of engagement with driving. pin 20-. The said sleeve 26 is rotatable in arm 4 and its end por-- tion outside head 3 carries a radial operating lever 2|, adjacent-to-knob- I4, which may be used to rotate the sleeve 25, and. this, by reason of the engagement of itsv slot 21 with the helical toothed gear wheel I 1, raises or lowers the coupling disc I8, into or. out of engagement with coupling pin 20.. The sleeve 26 is held in position. longitudinally by a retaining pin 28 engaged.

with. a circumferential groove 29 in sleeve 26.

From the. foregoing description it will be appreciated that the down feed of the grinding member is applied. manually, either (a) by the hand. wheel l2, which is primarily intended for coarse setting or (b) by the knob M, by adjustment of which a cut may be applied by predetermined small increments.

The important feature of the foregoing construction is the slotted sleeve 26, which in itself provides the following features:

('1) Permits of a plain straight bore for the worm shaft location.

(2') Provides axial location for the worm and two journal bearings in a turned part without necessitating boring of the castings.

(3) Provides simple means for disconnecting the worm drive from the feed screw H and releasing it forcoarse adjustment by handwheel l2.

What I claim is:

1. A surface grinding machine comprising combination a grinding tool, means for moving saidtool towards the work, said means including a feed screw, a. manually operable member: on.

said feed screw for rotating said screw, and. a. fine adjustment means for rotating said feed screw to effectfine adjustments of said tool relative. to the work, said latter means including a manually operated rotatable fine adjustment member, a reduction drive, a coupling device, and a control member, said. reduction drive in eluding a worm element rotatable by said fine adjustment member and a single helically toothed gear meshing with said worm element, said coupling device including a coupling disc fixed with said gear to form an axially slidable combined member and a cooperating complementarycoupling member fixed with said feed screw, and said control member including a slotted member rotatable co-axi'ally ofsaid worm element with the slot defining edges-of said member engageable with said' axially movable combined member, and means for rotating said slotted member to cause axial movement of said c'ombinedmemberto en- 4 gage it. with or disengage it from the complementary coupling member.

2. A surface grinding machine comprising in combination a grinding tool, means for moving said tool towards the work, said means including a feed screw, a manually operable member on said feed screw for rotating said screw, and a fine adjustment means for rotating said feed screw to effect fine adjustments of said tool relative to the work, said latter means including a manually operated rotatable fine adjustment member, a reduction drive, a coupling device, and a control member, said reduction drive including a worm rotatable by said fine adjustment member and. a single helically toothed gear meshing with said worm, said coupling device including. a coupling. disc fixed with said gear to form an axially slidable combined member and a cooperating complementary coupling member fixed with. said feed screw, and said control member including a sleeve surrounding and rotatable coaxially of said worm element; said. sleeve being longitudinally slotted for engagement with said axially movable combined member and to allow engagementfof the'he'lically toothed gear with the Worm, and means for rotating said slotted sleeve to cause axial movement of said. combined member to engage it with or disengage it from the complementary coupling member.

3. A machine according'to claim 2 wherein said sleeve is fitted in a bore in the machine frameadjacent to and at right angles to the feed screw, said helically" toothed gear being engaged with the worm element through the slot in the sleeve.

4. A machine according to claim 3 wherein said worm is mounted on a shaft, an operating member for rotating said worm shaft, said coupling disc having a recess, and said complementary coupling member having a coupling pin engageable in said coupling disc'recess uponaxial movement of said disc.

5. A surface grinding machine according to claim 2 comprising a base plate, a vertical standard on said baseplate, a radial arm slidable and rotatable on said standard, a casing carried by said arm, an electric motor within said casing and disposed with its spindle parallel to said standard and rotatably carrying said grinding tool at the lower end of said casing, and the feed screw being mounted parallel to the standard in a head rotatable on the upper end of said standard with said radial arm and casing, and passing through a female screw member in the part of said radial arm between said casing and said standard.

JAMES SELBY'.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 449,087 Prest Mar..24,. 1891; 1,312,881 Weiss et 21.1. Aug. 12,1919 2,178,022 Orcutt .2 Oct. 31, 1939 2,178,264 Meyer Oct 31, 1939 2,33%,581 Pyne. "Wane---" Nov.. 16, 1943 2,429,830 Ljunggen a Oct. 28, 1927 FOREIGN PATENTS Number Country Date 27,902 Great Britain o-- Dec; 1, 1910 265,918 Switzerland Dec. 31, 1949 978,787 France Jan. 11. 1 949