US2380693A

US2380693A - Wheel contour dresser

Info

Publication number: US2380693A
Application number: US526827A
Authority: US
Inventors: Ward H Hahir
Original assignee: Schlage Lock Co LLC
Current assignee: Schlage Lock Co LLC
Priority date: 1944-03-15
Filing date: 1944-03-15
Publication date: 1945-07-31
Anticipated expiration: 1962-07-31

Description

July 31, 1945. w HAHIR 2,380,693

WHEEL CONTOUR DRESSER Filed March 15, 1944 I 5 Sheets-Sheet 1 July 31, 1945. w HAHIR 2,380,693

WHEEL CONTOUR DRESSER Filed March 15, 1944 5 Sheets-Sheet 2 INVENTOR.

y 1945- w. H. HAHIR 2,330,693

WHEEL CONTOUR DRE SSER F ile d March 15, 1944 5 Sheets-Sheet s w a I IN VEN TOR.

A ain/5v? July 31, 1945. HAHN; 2,380,693

WHEEL CONTOUR DRESSER Filed March 15, 1944 5 SheetsSheet 4 29 F 2 i 29 I a as 26 -1 WKM/ zip 5/ m l|l w m }}:mu 2a '5 \\1.l

INVENTOR.

' ATTORNEY.

y 1945- w. H. HAHIR WHEEL CONTOUR DRESSER Filed March 15, 1944 5 Sheets-Sheet 5 Patented July 31, 1945 WHEEL CONTOUR DRESSER Ward H. Hahir, San Mateo, Calif., a'slignor to Sohlage Lock Company, San Francisco, Calif.,

a corporation of California Application Marcus, 1044, Serial No. 528,827

a Claims. (o1.- izs-u) This invention relates mainly to a machine for dressing or truing emery wheels or the like. particularly when the cutting or grinding face of the wheel is composed of curves of dii'ierent radii and also to the dressing of wheels where the curved surface terminates in a face disposed on an angle of a predetermined degree to' the wheel iace.

In most machines employed for this class of work a special templet five to ten times larger thantheoriginalsizedcurvetobedressed or formed in the cutting face of an emery wheel must be made and properly set up and secured in order that the follower which guides the diamond holder or dresser may function accurately. 'Both the making and setting up'of the templet is expensive andobviously one templet will only serve for the curvature for which it is designed. Hence,

when another curve is required a new templet will have to be made.

The object of the present invention is to provide a contour dresser that may be secured upon and used in conjunction with a universal grinding machine and further to provide a dresser for the dressing or truing oi emery wheels or the like particularly when the cutting or grinding face starting position;

Fig. 4 is a diagrammatic view showing thedifferent curves and angles to be dressed on the face of the emery wheel;

Fig. 5 is a view similar to Fig..3'but showin the position of the diamond 0r dresseras it is approaching the end of its cut;

Fig. 6 is a vertical cross section taken on line VI-VI of Fig. 5;

Fig-7 is across section taken on line vrI-vn of Fig. 5; 1 0

a Fig. 8 is a vertical longitudinal section taken on line VIII-VIII of Fig. 5; and

Fig. 9 is a perspective view of a stop member.

The contour .dresser forming the subject matter oi the present invention is designed for attachment to a universal grinding machine of the general type shown in Figs. 1 and 2. The grinding or emery wheel indicated at A of the universal machine is generally motor-driven and is mounted in such a manner that it may be moved to or away from a longitudinalmovable table B by a hand wheel C. The table proper is moved by hand-wheel D and a longitudinallyextending slot E is formed in the table and is utilized for the purpose of attaching and securing the contour dresser generally indicated at F.

The contour dresser is best shown inFlgs. 3 to '8, inclusive. It comprises a base plate 2 secured to the table by means of a pair of clamps I and l. The plate I may be disposed on an angle to the slot E or the longitudinal axis 'of the table and this is accomplished by providing a pivot pin 5 adjacent one end of the plate about which the plate may swing when the

clamps

3 and 4 are released. A pin 6 is secured to the opposite end of the base plate and when this pin engages a lug informed, on the clamp 3 the base plate aligns with the longitudinal axis of the tablebut, ii the plate is swung about the pivot Bin a direction which causes the pin 8 to move away from the lug to, plate I will assume an angular position and the angle may be determined by insertion of a gauge block between the pin 8 and the lug 8a. The importance of the angular adjustment oi. the

base plate with relation to the longitudinal axis or the table will hereinaiterbe described.

Supported by thebase-plate is an index plate I. Each side of the base plate is beveled, as shown in Fig. 6, and. a' pair of gibs 8-8 secured to the lower face of the index plate secures said plate to the base plate but permits longitudinal movement of the index plate with relation to the base plate, such longitudinal movement being imparted by a lever l pivoted to the base plate as in unison the plate It is always'hidden below the plate II. The intermediate plat It is pivoted to the index plate I by means of a pin 18 carried by the index plate. The plate I! sup ported by the intermediate plate It is slidably mounted thereon and may be moved radially inwardly or outwardly with relation to the pivot l8.

To accomplish this, plate I I is slotted, as shown at l9. A gib 29 is disposed in the slot and this is secured to the intermediate plate by screws. Hence, when plate I! i radially adjusted with relation to the pivot l9, it may be clamped and secured by the gib and the screws 2|. The intermediate plate and the sliding plate I! will accordingly move in unison when swung about the pivot l9 and their movement about said pivot in the direction of the lever 9 is limited by an adjustable stop screw 22 carried by the index plate I. The movement of these plates is also frictionally resisted by a raduated segment 23 which is secured to the index plate I. This graduated segment overlays the outer edge of the intermediate plate I, as indicated at 23c (see Fig. 6) and when the screws 24 which secure the graduated segment to the plate 'I are tightened, sufficient friction is supplied to the outer edge of the intermediate plate to prevent free movement to the plates l9 and I1.

The sliding plate I! carries a pivot pin 25 and pivotally mounted thereon and supp rted by the plate I! is a top plate 26 which is provided with a handle 21. Guide-ways 29 are formed on the forward end of the top plate 26 and slidably mounted therein and adapted to be clamped in the guide-ways is a head member 29 which carries a diamond cutter or dresser 39. A shoulder 3| is formed on the top plate and this forms a support for a gauge block hereinafter to be described.

Two stop members in the form of adjustable screwshave heretofore been referred to, to wit, the stop screw l and stop screw 22. One more stop member is required and that is indicated at 33. This stop member is best shown in Fig. 9. It is a stepped lug having a

stop shoulder

3,4 formed thereon. Two holes 35 are drilled in the lug and screws are passed therethrough to secure the lug as a whole to the intermediate plate 19 (see Figs. 3 and 4). The outer face of the stop lug 33- is provided with vernier graduation as indicated at 36 and their function will hereinafter be described.

Before describing the operation of the machine, let it be assumed that the contour to be dressed is that shown in Fig. 4. This contour consists of one face K which is parallel to the outer face L of the wheel, a curve G struck from the center M, a curve H struck from the center N and a face I disposed on an angle to the inner-face J. It will be noted that the radius of curve G is smaller than the radius of curve H and that where the curves join; they are tangent to each other and it should also be noted that the ends of the curves are tangent to the faces K and I. In view of the fact that the contour consists of two curves of different radii and two. faces which are disposed at different angles, it is obvious that several movements must be imparted to the diamond cutter 39 in order that an exact contour may be reface I, is accomplished by adjusting the base plate to the angle of that face and then imparting longitudinal movement to the machine as a whole.

To illustrate this in more detail, reference will bemadetoFig. 3. Inthisinstancethewheelhas direction of arrow a, the top plate together with a head member 29 carrying the cutter '39 will swing about the pivot 25 and the curve G of the smallest radius will be dressed. During this movement, the face 21a of the handle 21- will contact the stop shoulder 34 formed on the stop member, 33 thereby preventing further swinging movement about the pivot 25. By continuing swinging movement by means of the handle, plates 16 and I1 together with the top plate 26 and the head 29 carried thereby will continue to swing but they will now pivot about the pin l8 and, as this is the point of the larger radius, the curved portion H of the wheel will be dressed and when that curve is completed, plate I! will engage the stop screw 22 when further swinging of the plates is stopped. Now the dressing of the wheel can be completed by merely grasping the lever 9 and pulling it in the direction of arrow b. This imparts longitudinal movement to the machine as a whole and the face -I will thus be dressed and the dressing operation will be completed. If the face I is atright angles to the faces J and L, angular adjustment of the base plate is unnecessary. However, if the face portion 1 of the wheel is disposed on an angle, for instance of three degrees'with relation to a right angle, then the base would previously have been adjusted to assume that angle and that angle was determined by placing a gauge block between the pin 6 and the lug 9a of the clamp 3 and then securing the base plate by means of the clamps 3 and I.

In Fig. 5 the diamond oint or dresser 39 is shown in-the position assumed when it has completed dressing of the faces K, G and H and it is at this point that lever 9 is grasped to move the whole machine longitudinally so as to dress the face I. In this position the diamond or cutter will have moved beyond the inner face J of the wheel and the mechanism as a whole will assume the position shown in Fig. 5 except that it will be moved further to the left so that the diamond will clear the face J. This is the position assumed by the entire mechanism when it is ,to be set up to dress the different curves and faces.

The setting up operation is very simple. For instance, by loosening the gib plates 29-28 the head member 29 carrying the cutter 30 may be moved inwardly on the plate until the cutting point of the diamond assumes a position directly over the center of the pin or pivot 25, and by loosening the screws 2| of the gib 29, plate i'l may be moved until the pivot 25 is directly above pivot I9. When this position is assumed by the several plates, the machine may be said to be at zero. Now, if the contour shown in Fig. 4 is to be dressed and the operator desires to set the machine to dress these faces and curves, the

operator will first measure on the drawing the distance of the shorter radius and let it be assumed that this distance is a half inch. When this dimension has been determined, he moves the head 29 outwardly beyond the center point or pivot 25 sufllciently far to permit him to insert a gauge block measuring half an inch between the shoulder 3| and the inner end 290 of the hehd. Then by pushing the head back against the gauge block until physical flrm contact is swung about the pivot 23, it will produce the curve of small radius. To set the machine for the second or larger radius, the operator merely measures the distance of the line drawn between M and N. This distance is marked a quarter of an inch and all he has to do when this dimension is determined is to place a gauge block of that dimension between the opposite face of the shoulder 3| and the stop member 33. It is understood of course that the gib 20 is free at that time so that the plate I! may be moved inwardly or outwardly. Thi movement changes the position of the pivot 25 to that of the larger radius, then by tightening the gib 20 this position will be maintained. The next adjustment is the insertion of a gauge block between'the pin 6 and the lug 6a if the face I is to be on an angle. The angle may be one, two, three or more degrees as the case may be and a gauge block to take care of the angle required will therefore be introduced and then the base will be secured by tightening the

clamps

3 and 4. The next adjustment determines the position of the vertical face K. Let it be assumed that between the face K and the face L, there is a quarter of an inch. If that is the case,.the stop screw I5 is adjusted to a quarter of an inch, thus the cutter point shown in the position of Fig. 3 will be in the right position to dress this face when the wheel proper is moved toward the diamond point by means of the hand wheel C of the universal grinder. The final adjustment is the setting of the stop lug 33. It should be noted on Fig. 4 that a radial line is drawn between the radius points N and M. This line contacts the curves G and H where they join. This line may, for instance, be disposed on an angle of 30 degrees and, if it is, the graduate segment 23, is released by slacking the screws 24. Plates I6 and H are then swung about the pivot 13 until the shoulder 34 aligns with the 30 degree graduation mark, as shown in Fig. 3. Plates l1 and I6 are then frictionally secured in this position by tightening the screws 24 of the graduate segment. Thus when the top plate is swung about its pivot 25 by means of handle 21, it will first swing about the short radius and will stop when the face 21a of the lever engages a stop shoulder 34. This point is the line indicated on Fig. 4 where the curves G and H meet and where they are tangent to each other. When the face 21a contacts the shoulder 34 and further movement is imparted to the lever 21, then all plates will move in unison about the pivot l8 or the pivot of the larger radius and it is in this manner that the curved face H is dressed. A stop member is shown at 42 in Figs. 5 and 8. This limits movement of the several plates beyond the position shown in Fig. 3 while the stop screws l5 and 22 limit movement in the opposite direction.

By referring to Fig. 9 it will be noted that the stop lug 33 has a vernier scale formed on its outer face as indicated at 36. This scale is used in connection with the graduations of the segment 23 when adjusting the stop lug 33. That is the angle to which the stop lug is set may not always be exactly 30 degrees, it might be 25 degrees, or it might be, for instance, 32 degrees, and 16 seconds, and so on. Hence, by using the vernier in connection with the graduations on the scale 23, accurate settin of the stop lug'33 results.

From the foregoing, it should be apparent that the machine here shown saves the expensive work of forming enlarged templets for the grindin of contours of varying curvatures. As the pivot points of the machine are adjustable, it is obvious that surfaces composed of two curves may be made to many dimensions. Similarly, as the base of the machine-is angularly adjustable, angular faces may also be taken care of and vertical or parallel faces can be taken care of by movement of the wheel to and away from the contour dresser, and while this and other features of my invention have been more or less specifically 'described, I wish it understood that various changes may be made within the scope of the appended claims, and that the materials and finish of the parts employed may be such as the experience of the manufacturer may dictatemr varying uses may demand.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. A contour dresser comprising a base plate, means for securing said plate to the tabl of a universal grinder, an index plate supported by the base plate, means for imparting longitudinal movement to the index plate upon the base plate, an intermediate plate pivoted to the index plate, a sliding plate supported by the intermediat plate, a pivot secured to the sliding plate, means for radially adjusting the slidin plate with relation to the pivot on the intermediate plate, a top plate supported by the sliding plate and free to swing about the pivot carried by the sliding plate, a head member supported by the top plate, a dressing tool carried by the head, means for radially adjusting the head and dressing tool with relation to the pivot about which the top plate s ings, adjustable means limiting swinging movement of the top plate with relation to the sliding plate, adjustable means limiting swinging movement of the sliding and intermediate plates with relation to the index plate, and means for imparting swinging movement first to the top plate and then to the top plate and the sliding and intermediate plate in unison.

2. A contour dresser comprising a base plate, means for securing said plate to the table of a universal grinder, an index plate supported by the base plate, means for imparting longitudinal movement to the index plate upon the base plate, an intermediate plate pivoted to the index plate, a sliding plate supported by the intermediate plate, a pivot secured to th sliding plate, means for radially adjusting the sliding plate with relation to the pivot on the intermediate plate, a top plate supported by the sliding plate and free to sway about the pivot carried by the sliding plate, a head member supported by the top plate, a dressing tool carried by the head, means for radially adjusting the head and dressing tool with relation to the pivot about which the top plate swings, adjustable means limiting swinging movement of the top plate with relation to the sliding plate, adjustable means limiting swinging movement of the sliding and intermediate plates with relation to the index plate, means for imparting swinging movement first to the top plate and then to the top plate and the sliding and intermediate plate in unison, and means for imparting longitudinal movement to the index plate, the intermediate and sliding plate, and the top plate and the head member carried thereby along the base plate in unison.

3. A contour dresser comprising a base plate, means for securing said plate to the table of a universal grinder, an index plate supported by the base plate, means for imparting longitudinal movement to the index plate upon the base plate, an intermediate plate pivoted to the index plate, a sliding plate supported by th intermediate plate, means for radially adjusting the sliding plate with relation to the pivot of the intermediv swings, adjustable means limiting swinging movement of the top plate with relation to the sliding plate, adjustable means limiting swinging movement of the sliding and intermediate plates with relation to the index plate, means forimparting swinging movement first to the top plate and then to the top plate and the sliding plate and intermedlate plate in unison, means for imparting longitudinal movement to the index plate, the intermediate and sliding plate, and the top plate and the head member carried thereby along the base plate in unison, means for adjusting and securing the base plate at an angle to the longitudinal axis of the table of the universal grinder, and adjustable means limiting longitudinal movement of the index plate and all the plates carried thereby on the base plate in one direction.

WARD H. HAHIR.