US2355844A

US2355844A - Apparatus for dressing grindstones

Info

Publication number: US2355844A
Application number: US490158A
Authority: US
Inventors: Howard C Barbour; Franklin S Miller
Original assignee: CLEVELAND QUARRIES Co
Current assignee: CLEVELAND QUARRIES Co
Priority date: 1943-06-09
Filing date: 1943-06-09
Publication date: 1944-08-15
Anticipated expiration: 1961-08-15

Description

Aug- 15, 1944 H. c. BARBOUR vET A1.. 2,355,844

n APPARATUS FOR DRESSING GRINDSTONES l Filed June 9, 1943 3 Sheets-Sheet l 4f t I L *F- l 2z 0 umm u-ll-l n mw 2f lI K Y INVENTOR. 56.1 Hon/,4R0 C50/Peau@ Aug. 15,1944. H. c. BARBOUR ET A1. 2,355,844

y APPARATUS FOR DRESSING GRINDSTONES l Filed June 9, 1943 SSheets-Sheet 2' 52 l r mwummummnnu A v l I v Y. 4 lll L t Hon/,4420 C. 54.9500@ (44 BYFRANKL//v 5. M/uE/ www0/HYS Aug. 15, 1944. H. c. BARBOURY ET AL 2,355,844

APPARATUS FOR DRESSING GRINDSTONES A Filed June 9, 1945 5 Sheets-Sheet 3 HTTOHYW? Patented Aug. 15, 1944 APPARATUS FOR DRESSING GRINDSTONES 'Howard C.. Barbour, Elyria, and Franklin s.

Miller, Amherst, Ohio, assignors to The Cleveland Quarries Company, Cleveland, Ohio, a corporation-of Ohio v v Application June9, 1943, Serial No. 490,158

s claims.

'This invention relates to apparatus for dressing the peripheries of grindstones s-uch, for example, as the ordinary sandstone'grindstones L which have previously been cut and drilled centrally thereof.

The object of the present invention is to pro- `vi`de apparatus by which grindstones can be dressed rapidly and accurately without danger oi chipping `or breaking oli portions of the stones at the edges of the annular surfaces being dressed. In other words, it is the principal object of theiinvention toprovide a method and apparatus by which the output of the apparatus can be vastly increased over that of dressing methods and apparatus heretofore employed.

The invention may be further briey sum- ,.marized as consisting in certain details ofY conf struction and combinations andrarrvangements of parts which will be described inthe specification and set forth in the appended claims,

In the Vaccompanying sheets of drawings, Fig. 1 is a partialside elevation and Fig. 2 is a Ypartial plan view of one form of dressing machine, this machine being adapted for dressing grindstones vof smaller sizes;

Fig. 3 is a partial side elevation and Fig. 4 is a partial plan view of a modified form of dressing machine, this machine being adapted for dressing somewhat larger grindstones;

' Fig. 5 :shows the rough grindstone and the two cuttingdisks at the start of the dressing opera- 'tion, this view showing disks of the type illustrated in Figs.`1` and 2;

Fig. 6 is another v iew o f the same near the *completion of the dressing operation;

Fig. 7 is a view showing the completion of the ldressing operation;

the dressing operation under way; and

' Fig. 12 is a view oi the cutting disks of Figs.

" 3 and 4, this view being similar to Fig. 7 and showing the dressing operation completed.

Referring now to the drawings, I5 represents a portion of the bed of a dressing machine similar to a lathe' bed but omitting the supporting legs Rotatably supported onthe bed is a spindle I6 which is driven by a motor (not shown). This spindle is adapted to rotate the grindstone II to be dressed. The grindstone I'l is adapted to be secured against a shoulder I8 `on the spindle by a clamping block or flange I9 and-a nut 20. By simply removing the nut and slipping oil the clamping block or flange I9, the grindstone can be slid off the spindle, and in similar fashion a new grindstone can be quickly applied to the spindle. The spindle is adapted to be adjustably supported on the bed by means of a pair of Vpillow blocks 2l and 22 movable along ways 23 of the bed.

On a pair of

ways

24 and 25 of the bed are two

slides

26 and 21` which are adapted tobe simultaneously moved toward and away from each other by a handwheel28 which is connected by means of a worm 29 shown by dotted lines in Fig. 2 to a righthand and lefthand threaded screw 30 which is supported at the front of the bed. The righthand and lefthand threaded portions of this screw are engaged by nuts carried by extensions 3l supported by the two

slides

26 and 21, see particularly Fig. 1. The two

slides

26 and 21 are provided with undercut ways 32 at right angles to the longitudinal axis of the machine on which are mounted two slides 33 which are movable back and forth with reference to the grindstone I'I by means of hand levers 33a.

These slides carry two

cutting disks

34 and 35 which are pitched downwardly and outwardly as shown in Figs. 1, 2, and 5 to 8 inclusive. The angle of the downward and outward pitch of the cutting disk is important both from the standpoint of effective cutting and from the standpoint of maintaining the disks in sharpened condition. We find that an angle of not more than 17 and not less than 14 is satisfactory for this purpose; that is to say, the disks should be pitched downwardly and outwardly to this eX- tent. In other words, the cutting disks are so supported that they are pitched outwardly this denite amount and are pitched downwardly the same amount. By reference toFig. 9 it will be seen that the

disks

34 and 35 have beveled edges 36 which are beveled to substantially the same extent that the disks are pitched downwardly and outwardly.'

With the apparatus described above, the grindstone is dressed in the following manner:

Assuming that the grindstone I'I with its rough outer periphery which is to be dressed is attached to the spindle I6, the spindle-'is rotated and the handwheel 28 is turned to mov'e the screw 30 and bring the disks simultaneously toward each other until their cutting edges engage the grindstone, whereupon the disks will be rotated by contact with the rotating grindstone. The operator continues to turn the handwheel 23 bringing the two disks toward each other until a ridge lla (see Fig. 6) is left at the center of the periphery Aof the grindstone. Then one of the disks, in this instance the disk 34, is moved laterally from the periphery of the grindstone -by the operator turning one of the hand levers 33a until the disk is substantially in the position shown in Fig. 7, whereupon movement of thescrew 30 is continued, causing the other cutter, in this instance the disk 35, to bemoved in the same direction as before to cut through vthe ridge lla on the grindstone.

In Fig. '7 is shown the grindstone l with its periphery completely dressed, whereas in Fig. is shown the grindstone I1 at the start of the dressing operation. Fig. 6 shows the grindstone partly dressed readyto have the cutter134 backed away from it and .to allowthe other cutter to remove theridge lla. In this mannerchipping of the edge of the grindstone is avoided as would belikely to occur if a singlecutting disk-were employed and the vdisk were moved across the entire periphery of the grindstone.

Referring now to Figs.l 3 and 4 and Figs. 10, 11 and 12, it will be seen that invthis instance the dressing machine has a bed 31 which is .provided with a rotatable spindle 38 which is adapted to receive a grindstone 39 whose peripheryis to be dressed, the spindle being motor driven as in the previously described construction. .The bed 3l has ways 49 on which is movable a slidedl having undercut ways 42 (see Fig.r3) at right anglesto the longitudinal aXis of the machine and on these last mentioned ways is adapted to be moved a second slide 43 which can be moved toward and from the axis of the machine-by rotating a lever 44 to adapt the machine for grindstones of different diameters. 'The slide 4| has an adjustable stop 45 which limits the movement of the slide 43 toward the axis-of the-machine.

The slide 43 has a slide '46 which carries two supports -41 and 48 for the cuttingdisks49 and 50. The supports 4l and 48 can be moved'along ways 5I to adjust the distance between the disks -49and 50 and then are adapted to be clamped-in position. The slide 46 carries a screw 52which-can be turned Iby a handwheel 53-to adjustthe'position of the

disks

49 and 50. This screw-52 -hasacontinuous one-way thread which engages a-nutcarried by the slide 4B.

The

cutting disks

49 and 50 Vare'arranged like the

cutting disks

34 and 35 of the construction rst described, that is `to say,-they havera downward pitch relativeito the machineand an outward pitch relative .to eachother ofthe same angular amounts as in the rst construction. Likewise, the cutting disks are provided with beveled edges 54 similar to the beveled edge-36 of each of theicutting disks .of the rst described construction. The edge 54 of each of the'disks 49 and 59 is beveled at an angle .substantially equal to the angle of the downward and lateral pitch of the cutting disks.

With this construction both disks move simultaneously in the same direction. The screw is rotated in a direction to lcause oneof the disks to start the dressing operation, in this vinstance the disk `49, .as shown in Fig. l1, and Yafter this rotation of the screw 52 is reversed `by turning the handwheel in the opposite direction, bringing the disk 50 into operation so as to complete the dressing operation. If desired, the disk 50 may be moved entirely across the periphery of the grindstone so as to insure a completely smooth periphery, this being shown in Fig. 12. In this manner the likelihood of chipping the edge of the grindstone is eliminated, asinthe case of the construction shown in`Figs. 1 and 2.

Fig. 10 shows the arrangement with a disk 49 about to start the dressing operation. Fig. 11

'shows the dressing operation partially completed,

and` Fig. l2 shows it entirely completed.

When the dressing operation is completed and anothergrindstone is to be placed on the spindle 38, one of .thecutting disks, in this instance the disk 49, is'backed away with respect to the disk .50 so as to .allow the grindstone to be placed in position without injuring either disk, and this is accomplished by mounting the disk 49 (see Figs. 3 and 4) on a slide `55 which is movable `.along undercut ways of the -supportz41 -byrotating a .hand lever 56. Then as soonras the grindstone is in position on the spindlethe cutting .disk A'49 and the slide 55 are moved forward :soiasito position the disk 49 in line with .the disk 59. Or, if desired,.both disks can be simultaneously backed away and moved forward by turning .the `hand lever 44.

It will be understood that thespindle :38 and the grindstone 39 are driven by Ia motor not shown, and the grindstone is attached -to the spindle as in the rst described-constructiomand that at the beginning `of the dressing operation the rst disk'49 (or the disk 5U) is rotated byfits contact with the grindstone, and after the dressing operation is substantially completed and the direction of the screw 52 is reversed, the cutting '-disk59-`(orlthe diskfllg) is immediately rotated by contact with the grindstone. Likewise, it will be understood that the cutting

disks

49 and 50 are self-sharpening, ras'in the construction first vdescribed.

Thus it will be seenthat the objects of the'invention are attained very eiectively yby either construction, that is to say, the Ycutting rdisks have long life and are self-sharpening, andthe machine has a veryhigh output'so that'the cost of dressing each grindstone 'isreduced to a minimum and at the same time the likelihood of chipping or .breakage of the edge of the. grindstone is substantially eliminated.

While we have illustratedtwo .embodiments of the invention, we do not desirevtobeconned .to the precise details of construction yof the apparatus illustrated and described, -but vaim in our claims to cover all modifications which do-'not involve .a departure from the spirit and the scope of the invention.

Having thus described our invention,:we claim:

1. In.a Amachine for dressing .grindstones, `a frame having a rotatable spindle yon which a grindstone is adapted to be mounted, and means for dressing the periphery ofthe grindstone comprising a pair of slides on the frame of themachine carrying a pair of cutting-disks, eachcutting disk being vpitched downwardly and outwardly and having a self-sharpening beveled (cutting edge, and means -for simultaneously feeding the disks toward each .other for dressing the majorrportion of the periphery of thefgrindstone, and means for backingaway-from theperi-phery Aof the grindstone one of the disks .fso'that by continued feeding ofthe Yother'disk-in thesame -direction as before theremainder of the periphery of the grindstone can be dressed.

2. In a machine for dressing grindstones, a frame having a rotatable spindle on which a grindstone is adapted to be mounted, and means for dressing the periphery of the grindstone comprising a slide on the frame, a pair of supports on the slide carrying a pair of cutting disks, each cutting disk being pitched downwardly and outwardly with respect to the horizontal axis of the grindstone, and means for bringing one and then the other of the disks into contact with the periphery of the grindstone, each disk having a selfsharpening beveled cutting edge.

3. In a machine for dressing grindstones, a

HOWARD C. BARBOUR. FRANKLIN S. MILLER.