US2435234A

US2435234A - Grinding wheel dresser

Info

Publication number: US2435234A
Application number: US589435A
Authority: US
Inventors: Munro Gordon
Original assignee: Individual
Current assignee: Individual
Priority date: 1945-04-20
Filing date: 1945-04-20
Publication date: 1948-02-03
Anticipated expiration: 1965-02-03

Description

Patented Feb. 3, 1 948 UNITED- STATES OFFICE GRINDING WHEEL DRESS-ER GordcniMnnro, Bremerton; Washn ere i eiionzemilazo 19 i S r1aI5N -58%135 sprai (01. 125-41):

(Granted: under the act oi} March 3-;- 1883;; as

amended- April'30, 1928;; 3 70 0 G. 75-7)- This invention relates: to agrinding. wheel dresser and hasfoi an} object to providei a grinduing' wheel dresser which will 3 dress the grinding face of agrinding'wheel and'w-illthen plac' *the newly-dressed surface of the grinding f'acedn-the original plane of the grinding face.-

A further object of this invention is-t0 provide a means for dressing theg-ri-nding 'fa'ceof-a-grinding wheel-as muchas;may lee-necessary to provide an absolutely plane f' grinding face and which 'will thereafter placethe plane of the: newly-dressed grinding? a e b ck n or inal ane hi h theis rli sffac joq upie r ier t asd a d A' still further object of'thls; inventionlisj to provide a grinding wheel; dresser particularly useful in. connection with dressing a grinding wheel forming part of a, twist drill grinding machine wherein the face of'fthegrinding, wheel may be dressed whenever needed. and then after being dressed, the newly-dressed grinding face of the wheelmay be placedinthe identical plane origiinally occupied by the grinding .face .of th'e wheel Without the necessity of using anyp extraneous measuring. instruments whatsoever, but wherein arsimple operation of the mechanism serves to dress the faceofthe grinding wheel, any desired amount and thereafter; a further simpleoperation moves the entire wheel transversely the exact amount that its grinding?faceshasbeen. dressed, thus maintaining the grinding .face. lathe-same operative position irrespective of how muchor howoften it maybeidressed.

Still another objectof thiscinvention is, to pro, vide a. grinding wheel dresser. useful in: the type of. drill grinderishown in a companion patent application, N. C. 3691, Serial No; 589,434,; filed Apr l 20, 1945, by the-sameapplicant.

With foregoing and other-a objects in view; the invention consists in theconstruction, lcombinae tion and arrangement of parts hereinafter set forth, claimed and illustrated. therdrawing, in wh ch:

Fig. 1 isa persp ective,'- partly broken-away view of the operative parts? of: the dresser: viewing it from beneath.

Fig. 2 is a partlysectional, partlylelevational view of- -the grinding wheel dresser-i of a this invention mounted in operative position;-

Thereis shown at 10 theigrin'ding-ewheel dresser ofthis invention wherein a grinding wheel I! is mounted for rotation bya motor lzpsnpported in a, motor casing [amounted on-aslidehousingw I l, which in turn issecured byrmeans of cap screws '4' ne-male .de- .5.- I Therm ls o ide I than t turn: slidably mounted by.-,- means of its dQve-tail key; in a female: slide l1"; whichin turn is secured;.bm'capscrewsa-H to-a slidebase I8 firmly mounted :on "a bed plate, table, or other;supportingi surface; (not shown). As a result of the mechanism thus far described; it is apparent that the position of theimoton l2 and grinding wheel H are". fixed'relative ftO the :maleslide l 5'; but are movable: transversely "of the 2 plane of rotation of the: motor 12' and grinding: wheel: I lalong 7 the femaleislidesll and its slideib'ase I 8;

Whemthe:grinding awheel'l l is used ina grind ing operati'on;.-it is thefrface 20 that'is-used'asi-a grindinggsurface; Hence; the face- 20' wears'-dur ingoperation and mustbe dre sed and then restored-to its originalfposition if it is to continue taper-form its-intendedfunction; In order todo this, a dresser diamond''2 l is providedon the end of a" dresser arm- I 2 2; which in turn is pinned on the "end' of a shaft 2 3.- The shaft 23--is journaled throughthe female;- slide l1 and has a dresser handle zt secured to its other end;

wilr eransa en that n in mov m of the dresser handle 24 will cause corresponding m l ment' f he, d ess a m 22 d r diamond-r laoross the face 20; of grinding wheel ll; A. hollow adjusting, screw 25 having. a knurled controlwheel 26" attached thereto is maintainedon thelshaft 23 between a collar 21 pinned "to the shaft 23;, and, the securing means folfth e -dresser handler. Theimale slide I5 is provided with a depending boss 28. which is internally threaded to cooperate withthe threads oiftheadjusting, screw 25; With this construction, iti will'be apparent that rotation of i the knnrledcontrol, wheel 26 will cause axial movement of the shaft 23 relative to the male slide 15 and th e grindinglwheel ll within the limits permitten-by hec llar l i n' l hould r 3!! provid in -the"bottom o f:thefemale slide l1. Another collar 3 l -on shaft 233extends between the dresser arm-22 and acounterhored' opening 32- in the female slide l1. A- feed screw "33 journaled between a pair of collars Hand 38 pinned thereto through; a" second boss ,34 depending, from the m lelj li i g v dsd" h a a d e (1 1. r lil hlfieed e t 1 1 9 "and: O t f a o spo in hreads t ?11?. 1 1 e? 5 n" he; femal slide 11 t mgve the malew'slide l5jjand1wheel H relative to he emalej lide l] emits-suppo t ng base It;

The slide housing; Hisurrounds the male and female slides, except .for an openingon the undersideito permit relative Sliding movement. bee tweee hse lides The lid heuisi a n alse functions as a shield to protect the mechanism from dust. A plate 39 having a cut-out portion in the central part is secured to the lower face of the slide housing. The plate 39 encloses the space left open by the distance by which the male slide extends beyond the female slide at either end. The female slide has cut-away portions on the lower face adjacent the slide base l8 to receive the edges of the plate 39 adjacent the opening therein. The plate 39 thus provides dust protection for the area not covered by the slide housing M.

In operation, the dresser handle 24 may be partially rotated to move the dresser diamond 2| over face 20 of grinding wheel ll. When the grinder is assembled, the desired plane of the face an is exactly at the point of the dresser diamond 2i and the collar 21 on shaft 23 is simultaneously in abutting contact with the shoulder 30 of female slide ll. As the face 20 is dressed. it wears away somewhat and it is necessary to rotate the adjusting screw 25 by means of knurled wheel 26 so as to move the point 2| against the grinder wheel face 20 as long as there are any irregularities in face 20, meantime slowly swinging the dresser handle 24 back and forth until the face 20 has been dressed to a single plane.

Whatever amount of face 20 is worn off during the dressing operation will be represented by the space between the collar 2! and the shoulder 30, for in rotating the feed screw 25 the collar 21 and shaft 23 have been moved axially through the female slide I! a distance exactly equal to the amount that the face 20 has been dressed. To bring the face 20 back to its original plane it is merely necessary to then move the grinding wheel H and its motor l2 together with its casing l3 back this same distance. This is done by merely rotating the feed wheel handles 35 to thread'the feed screw 33 into its threaded aperture 36 in the female slide l1, thu moving the male slide l together with the slide housing I 4 until the collar 21 again abuts shoulder 30, the dresser handle 24 having, of course, first been operated to swing the dresser diamond 2! away from face 20. This causes the .male slide l5 and the parts carried thereby to move along the female slide l1 and its supporting slide base l8 a distance exactly equal to the amount that the face 20 of grinding wheel H has been dressed, thus bringing the newly-dressed face 20 back to the identical plane that it occupied before it was dressed.

Other modifications and changes in the number and arrangement of the parts may be made by those skilled in the art without departing from the nature of this invention, within the scope of what is hereinafter claimed.

The invention herein described and claimed may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor.

I claim:

1. A grinding wheel dresser for dressing the grinding face of a grinding wheel and then placing the newly-dressed surface of the grinding wheel in the original plane of the grinding face, said dresser comprising a base, a grinding wheel support movably mounted on said base, a dresser means mounted for dressing movement against saidgrinding wheel and means for moving said grinding wheel support relative to said base the exact distance that said dressing means has moved into the grinding wheel, said latter means comprising abutting means on said dresser means and said base adapted to be separated as said dresser means moves into said grinding wheel and then be brought back into abutting position to limit the movement of said grinding wheel support to the amount that the grinding wheel has been dressed.

2. Means for dressing the grinding face of a grinding wheel and for placing the newly-dressed surface of the grinding face in the original p ane of the grinding face comprising means for mounting the grinding wheel for movement in a direction normal to the surface of the grinding face, said mounting means including a slide on which said wheel is mounted and a slide base in which said slide is relatively movable, means for mounting a dresser means for dressing movement across the grinding face to be dressed and normal to the grinding face to be dressed, said dresser means mounting means including a shaft, mean for moving said shaft axially as said dresser means is moved normal of the grinding face being dressed, a shoulder on said shaft, 2. cooperating shoulder on said slide base abutting said shaft shoulder when said dresser means and the grinding face are in the original plane, said shaft shoulder being moved away from said slide base shoulder by the dressing movement of said dresser means normal to said grinding face a distance equal to the normal movement of said dresser means, and feed means connecting said slide and slide base for moving said slide relative to said slide base in a direction opposite to the normal dressing movement of said dresser means, after the dressing operation is completed, until said shaft shoulder and slide base shoulder are again in abutting relation, thereby placing the newlydressed surface of the grinding face in the original plane of the grinding face.

3. A grinding wheel dresser for dressing the grinding face of a grinding wheel and then placing the newly-dressed surface of the grinding wheel in the original plane of the grinding face, said dresser comprising a base, a slide member mounted on said base, said slide member supporting said grinding wheel, a depending boss on said slide, said slide base being recessed about said depending boss, a hollow adjusting screw threaded through said depending boss, a dresser shaft extending through said hollow adjusting screw and journaled through said slide base beyond said base recess, the wall of the base recess providing a shoulder, a collar pinned to said shaft Within said recess providing a cooperating shou1- der to abut said recess shoulder, a dresser arm on said shaft, a dresser means on said dresser arm adapted to contact the grinding face of the grinding wheel, a dresser handle on said shaft for controlling the transverse movement of said dresser arm and dresser means across the grinding face, said adjusting screw controlling the axial movement of said shaft, dresser arm and dresser means normal of the grinding face and feed screw means connecting said slide and slide base and moving said slide relative to said slide base, whereby when said adjusting screw is operated to move said dressing means normally against said grinding face, said abutting shoulders are separated apart a distance exactly equal to the normal movement of said dresser means against said grinding face and then, after the dresser handle is operated to move said dresser means away from said grinding face, said feed screw means is operated to move said grinding wheel slide in a direction opposite to the normal movement of the dresser means against said grinding face until said collar shoulder abuts said recess shoulder, thereby moving the grinding wheel a distance exactly equal to the amount its grinding face has been dressed, and thus placing the newly-dressed surface of the grinding face in the original plane of the grinding face.

4. A device for dressing the grinding face of a grinding wheel, and for advancing the newlydressed surface of the grinding face to the original plane of the grinding face, comprising means mounting the grinding wheel for movement in a direction normal to the surface of the grinding face, a base supporting said mounting means, dresser means, means supporting said dresser means on said base for dressing movement across the grinding face and for movement normal to the grinding face, feed means connecting said mounting means and said base for advancing said mounting means relative to said base, and means carried by said mounting means and cooperating with a portion of said base for limiting advancing movement of said mounting means to a distance equivalent to the thickness of material removed from th grinding face during a dressing operation.

5. In a device of the class described, a base, a grinding wheel, means supporting said grinding wheel on said base for longitudinal movement with respect to said base, means for dressing the grinding face of said grinding wheel, means for moving said grinding wheel and said supporting means longitudinally with respect to said base, and means carried by said supporting means and cooperating with said base for stopping move ment of said grinding wheel and supporting means when the grinding face of the grinding wheel returns to the position occupied prior to the dressing operation.

6. Ina device of the class described, a base, a grinding wheel, means supporting said grinding wheel on said base for longitudinal movement with respect to said base, means for dressing the grinding face of said grinding wheel, said dressing means including a shaft mounted for rotary and axial movement in said base, a dresser arm carried by said shaft, and means carried by said supporting means for moving said shaft axially and thereby moving said dresser arm toward the grinding face of said grinding wheel, feed means for advancing said grinding wheel and 'said supporting means longitudinally with respect to said base, and means carried by said shaft cooperable with said base to limit advancing movement of said grinding wheel and said supporting means.

7. A grinding wheel dresser for dressing the grinding face of a grinding wheel and then placing the newly-dressed surface of the grinding wheel in the original plane of the grinding face, said dresser comprising a base, a grinding wheel support movably mounted on said base, a dresser means mounted for dressing movement against said grinding wheel, means for moving said grinding wheel support relative to said base, and means carried by said support and cooperating with a part of said base for limiting thedistance of movement of said grinding wheel support to the distance that said dressing means has moved into the grinding wheel.

8. A grinding wheel dresser for dressing the grinding face of a grinding wheel and then placing the newly-dressed surface of the grinding wheel in the original plane of the grinding face, said dresser comprising a base; a grinding wheel support mounted for movement relative to said base, dresser means mounted for dressing movement against said grinding wheel, an abutment fixed to said base; a, second abutment adjustably carried by said support in abutting relation to said first abutment when the plane of said grinding wheel is coincident with its original plane and movable out of abutting relation with said first abutment in response to relative motion between said dressing means and said grinding wheel occasioned by the dressing operation and means for producing relative movement between said grinding wheel and said base to return said abutments to abutting relation whereby the plane of said grinding wheel is returned to coincidence with its original plane.

9. In a device of the class described, a base, a grinding wheel, means supporting said grinding wheel on said base for longitudinal movement with respect to said base, means for dressing the grinding face of said grinding wheel, means for REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,052,649 Boynton Feb. 11, 1913 1,473,520 Rosak Nov. 6, 1923 1,810,408 Schurr June 16, 1931