US3046968A

US3046968A - Grinding wheel dresser

Info

Publication number: US3046968A
Application number: US854449A
Authority: US
Inventors: Lewis C White
Original assignee: Individual
Current assignee: Individual
Priority date: 1959-11-20
Filing date: 1959-11-20
Publication date: 1962-07-31
Anticipated expiration: 1979-07-31

Description

July 31, 1962 L. c. WHITE GRINDING WHEEL DRESSER 2 Sheets-Sheet 1 Filed Nov. 20, 1959 Lew/ls C. White 1N VEN TOR.

40: 2:. BY M July 31, 1962 1.. c. WHITE 3,046,968

GRINDING WHEEL DRESSER Filed Nov. 20, 1959 2 Sheets-Sheet 2 w \l I I, 96 1 x I8 20 Fig.6

28 Lewis 6. White 28 A 26 INVENTOR.

BY fizmaazn.

ilnited States This invention relates to a grinding wheel dresser. 7

An object of the invention is to provide a time-saving tool furnishing great accuracy in the dressing of grinding wheels.

Briefly, the invention is embodied in a grinding wheel dresser which is constructed and arranged to hold a grinding tool, usually a diamond, at a precise angular relationship with respect to a grinding wheel which is to be faced. The tool is made of a block constituting a base, and a movably mounted assembly on the base capable of being locked in numerous angular positions with respect to the base. Further, provision is made for receiving a gauge block of any height (within practical limits) so that precise angularity is obtained i.e. within tolerances considered to be optimum by machinists and instrument makers.

An important feature of the invention is that the grinding wheel dresser may be easily converted to a vise whereby the instrument becomes a multipurpose tool.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

FIGURE 1 is a top view of'the grinding wheel dresser in accordance with the invention.

FIGURE 2 is a sectional view taken on the line 22 of FIGURE 1, this view showing the dresser in a second position (in dotted lines).

FIGURE 3 is an end view of the dresser in FIGURE 1.

FIGURE 4 is a transverse sectional view taken on the line 4-4 of FIGURE 2.

FIGURE 5 is a side elevational view, parts broken away in section, showing the dremer used as a vise.

FIGURE 6 is an enlarged fragmentary sectional view taken on the line 66 of FIGURE 5.

In the accompanying drawings there is illustrated a grinding wheel dresser 10 which exemplifies the principles of the invention. As shown .in FIGURE 2, grinding wheel 12 is being dressed by the dressing tool 14, which is ordinarily a diamond, although the principles of the invention are equally well put into practice should tools of some other type be used.

Dresser 10 is made of a base 16 and a movable frame 18 pivotally connected with the base. The pivotal connection is established by spindle 20 attached to frame 18, for instance by bolts 22 (FIGURE 2) and sleeve bearing 24 which is formed by a transverse bore in base 16. The spindle is capable of being locked in selected pivotal positions (FIGURE 2) by tightening screws 26 at opposite ends of spindle 20 thereby spreading the ends of the spindle to bear tightly against the surface of sleeve bearing 24-. As seen in FIGURE 6, slots 28 are cut in ends of spindle 20, and there are tapered internally threaded openings 30 accommodating the tapered screws 26.

Base 16 is essentially L-shaped when viewed from the side (FIGURE 5) having an upstanding part 32 and an elongate lower part 34. The upstanding part 32 has sleeve bearing 24 formed therein, and the upper face 36 of part 34 constitutes a seat for bar 38 and also a seat for a gauge block 49 which is shown in dotted lines in FIGURE 2. Bar 38 is fixed, for instance by bolts 42 to the forward part of frame 18, fitting within a notch atent ire 44 formed therein. When it is desired to use a gauge block, the frame 18 is elevated, and bar 38 bears against the top surface as shown in dotted lines in FIGURE 2. Of course, the gauge block may be of any height depending on the angularity at which the grinding wheel 12 is to be dressed. i

Frame 18 has an upwardly opening channel 50 (FIG- URE 4) therein, and a cover plate 52 is bolted or screwed as at 54 to the top surface of the main body of frame 18. The cover plate extends over the upwardly opening channel 50, and it is preferred that the cover plate '52 he recessed so that the main body of frame 18 is accepted in the recess.

Elongate slot 56 is formed longitudinally in cover plate 52 to provide a passageway for the diamond cutter sup port 60. The support 60 may assume a number of configurations, one of which is simply a post mounted in the travelling nut 62 by fitting in an aperture 64 therein. The set screw 66 can be used for separably fastening the support 60 in place within the opening 64 in the travelling nut.

Travelling nut 62 has an internally threaded passageway 70 which receives screw 72. The screw has a spindle 74 at one end mounted for rotation in a bearing opening 76'formed in end plate 78. The end plate is secured in any suitable way, to the rear end of frame 18 and closes the rear end of channel 59. The front end wall 80 is also suitably secured to the main body of frame 18 and has an aperture 82 therein mounting .the forward spindle part 84 of screw 72 for rotation. Handle 85 is secured to part 84 of the screw 72. Upon rotation of the handle it is now quite evident that the travelling nut 62 will traverse slot 56. v

When used as. a vise, the dresser 10 has 'a special jaw connected with travelling nut 62. The jaw 90 is special in the sense that it has spindle 92 (FIGURE 5) depending therefrom and occupying opening 64 in place of support 6%. In both cases i.e. support 60 and spindle 72 it is preferred that they be angulated rearwardly to suit the angul'arity of opening 64. The second jaw 94 of the vise is formed by a block having an overhanging flange 95 at the rear thereof and in which there is an opening.

Screws

96 and 97 attach jaw 94 to plate 52 and wall 78 respectively. Upon rotation of handle 85 the jaw 90 travels toward or away from jaw 94 thereby causing the dresser to function as a vise.

Cover 103 is fitted over the top of the dresser, when used as such, and it is held attached at its edge by engagement of head 105 in groove 107 at the edge of plate 52. The cover is flexible, for instance made of rubber, and full so that it may flex as it is moved. Passage 109 formed as the bore of a sleeve 111 or simply as an opening in the cover allows the support 60 to extend through the cover. The purpose of the cover is to exclude dust and other foreign substance from the interior of the dresser.

In operation as a dresser, the desired angularity for the dressing of a grinding wheel 12 is selected. This may be done in three ways. The first is to simply use the screws 26 as the means for holding frame 18 in a selected angular position with respect to base 16. The second is to use only a gauge block 40 to serve this purpose. Finally, both the gauge block 40 and the screws 26 may be used. A machinist or instrument maker, as in connection with most tools, finds his own methods of use most suitable to him and to his particular jaw, and uses them.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed. What is claimed as new is as follows:

' 1. In a precision grinding wheel dresser, the combination of an essentially .L-shaped base having an elongated portion and an upstanding portion, a frame, a spindle, said upstanding portion having a bore constituting a bearing in which said spindle is mounted for rotation, selectively operable means expanding said spindle into frictional locking engagement with said bore for infinitely adjustable positioning of said spindle in'said bore, said frame having an elongate channel therein, a nutin said channel, a screw extending through said nut and mounted for rotation in the ends of said'channel, means by which to turn said screw and thereby move said travelling nut "in said channel, means provided in said nut for accommodating an object to be moved with said travelling nut and wherein the object has an elongate part, said frame having an elongate slot registered 'with said channel through which said part is extended and protective flexible shield means anchored to the frame and said elongated part for enclosing all surfaces of the travelling nut and channel. 1

2. The combination of claim 1 wherein said base elongate portion has an upper surface, and means carried by said frame and contacting said upper surface to establish a lowered position of said frame.

3. A precision angle grinding Wheel dresser comprising base means, frame means, pivot means mounted at one end of the frame means and received by said base means for angularly positioning the frame means relative to the base means about a pivot axis, contact means mounted on said frame means at an end opposite said one end for optional contact with the base means, lock means mounted in thebase means operable to engage the pivot means with the frame means for locking the frame means in an infinitely adjustable angular position, tool mounting means, guide means mounted on the frame means for guiding movement of the tool mounting means along a path perpendicular to the pivot axis, mechanical means drivingly connected to the dresser mounting means for movement thereof relative to the guide means, a tool ad- V justably secured to the tool mounting means and projecting through said guide means and flexible protective shield means anchored to the frame means and to the toolto 4. The combination of claim 3 wherein said lock means comprises tapered slots formed in portions of the pivot means received in the base means and expansion means operatively mounted in the tapered slots and operative to expand said portions of the pivot means into fric tion locking engagement with the base means in any 'angu 5 lar position of the pivot means. I

5. The combination of claim 3 wherein said'dresser mounting means comprises a travelling nut block having a bore angularly disposed with respect to the path of movement of the block for receiving an angled portion 9 of said tool. 1

References Cited in the file of this patent V 1 UNITED STATES PATENTS Berg Aug. 20, 1929 Starn June 5, 1945 Ravosi Aug. 12, 1947 Chandler May 19, 1953 Failla Dec. 13, 1955 Barrett ..\Feb. 7, 1956 Williamson May 26, 1959 Cole June 9, 1 959 FOREIGN PATENTS p 1958 (inside back cover).

Eller May 17, 1955 Wildhaber Aug, 4, 1 959 7 1 Habit,-from Industrial Diamond 'Review, for June