US1935328A - Grinder - Google Patents

Description

Nov. 14, 1933. H. O. MUNN 1,935,328

GRINDER Filed Dec. 16, 1929 3 Sheets-Sheet l INVENTOH Henry G. Mz/nn.

ATTORNEYS.

GRINDER is, 1929 3 Sheets-Sheet 2 I v WM Nov. 14; 1933..

v k n A INVENTOF? Henry Q.v Mz/nn TTORNEY5.

Nov. 14, 1933. Q U 1,935,328

GRINDER Filed Dec. 16, 1929 3 Sheets-Sheet 3 INVENTOR Henry Q. M7/7777.

BY k1 gm flaw w AT RNEYS.

UNITED STATES PATENT OFFICE.

GRINDER Henry Q. Mann, Walkerville, Ontario, Canada, assignor to Du-More Tap and Tool Company, a corporation of Michigan Application December 16, 1929 Serial No. 414,267

4' Claims. (01. 125-11) This invention relates to wheel dressing or a grinding machine having a supporting frame trimming devices for grinding machines. 6, a work supporting table 7, a grinding wheel The main objects of this invention are to pro- 8 journaled on a vertically movable grinding head vide an improved wheel dressing device which, 9 is shown, provided with my improved wheel when once set in proper co-operative relationdressing device mounted above the grinding head. 60

ship with respect to a grinding wheel, will at each The wheel dressing device is mounted on a frame and any relatively small arbitrary advancement 10 vertically movable on guides 11 and 12 of the of the wheel relative to the work, followed by grinding wheel frame 6, and securable in adthe operation of dressing the wheel, maintain the justed positions by studs 13 and nuts 14 threaded 10 dressed form of the wheel at that point where thereon. 65 it contacts with the work at a fixed predeter- The frame 10 has an integrally formed outmined distance relative to the work support; to wardly projecting wing 15, one face of which is provide a grinding wheel dressing device which provided with vertically disposed guideways 16 will be automatically moved relative to the cenand 17 rigidly mounted in spaced parallel relater of the wheel an amount proportional to the tion. The inner faces of the guides 16 and 1'! 70 relative bodily movement of the wheel relative are grooved to receive spherical ball bearings 18 to the work support; and to provide an improved and 19, which are interposed between said guides, mounting and actuating mechanism for the and a similar pair of guides 20 and 21 respectivegrinding wheel dressing elements. 1y, which are rigidly mounted on a back plate 22.

20 An illustrative embodiment ofthis invention is The back plate and guides thereon, together 75 shown in the accompanying drawings, in which: with the hereinafter described mechanism Fig..1 is a view in perspective of a grinding 'mounted thereon, forms a vertically reciprocable machine equipped withmyimproved wheel dresscarriage which is bodily movable toward and ing device. away from the grinding wheel 8. The plate 22,

Fig. 2 is an enlarged horizontal sectional view at its inner vertical marginal edge, has a pair of go of the grinding machine taken just above the sleeve members 23 and 24 secured thereto which wheel dressing device, and showing the dressing surround a vertically disposed rod 25. The device in top plan view. sleeves are split lengthwise and have suitable Fig. 3 is an enlarged view in front elevation of bosses integrally formed thereon, which are suitthe improved wheel dressing device. ably drilled and tapped to receive screws 26 and Fig. 4 is a view in end elevation of the same. 27 respectively, for clamping the sleeves to the Fig. 5 is afragmentary bottom plan view showrod 25 when tightened up. The plate 22 caring the lever which moves the wheel dressing ries on the front face thereof a pair of superdevice. posed guide frame plates 28 and 29 which are 35 Fig. 6 is a sectional view taken on line 6-6 pivoted on a pin 30 which passes through the of Fig. 3 looking in the direction indicated by plates 28 and 29, and has its inner end mounted the arrows. in the back plate 22. A series of headed studs i 7 is a top D1811 w Of t o p i g 31, 32, 33 and 34 pass through holes in the plates guide bars showing the anti-friction elements in- 28 and 29 and thread into the back plate 22 for 40 terposed therebetween. securing the frame plates to the back plate. The

Fig. 8 is a view in side elevation of the same holes through the frame plates 28 and 29 are with a portion thereof broken away to more slightly larger than the shanks of the studs 31 to clearly show the interior construction. 34 inclusive, so that the frame plates may be Fig. 9 is an enlarged sectional view taken on shifted slightly relatively to each other, and to 5 the line 9-9 of Fig. 3 looking in the direction the back plate. indicated by the arrows. Means are provided for accurately measuring Fi 10 is an la d s t onal view taken the relative positions of the plates to deteron the line 10-10 f Fi 3 l king in the direcmine their angularity with respect to each other tion indicated by the arrows. and to the back plate, and comprise a stud 35 50 Fig. 11 is a diagrammatic sketch illustrating mounted in the back plate 22 in vertical alignthe application of the invention where the trimment with the pivot pin 30, and outwardly proming device moves in a direction relative to the jecting studs 36 and 37 mounted on the frame wheel different from that shown in the previous plates 28 and 29 respectively. figures. The adjacent faces of the frame plates 28 and 55 In the construction shown in the drawings. 29 are provided with grooves 38 and 39 respeco tivelypwhich form guideways for a pair of bars 40 and 41 respectively, which are axially slidable therein, and which serve as supporting members for a pair of diamond-point wheel dressing elements 42 and 43 respectively.

The guideways 38 and 39 extend transversely with respect to each other, and converge in a downward direction, and are offset in vertical plane so that the bars 40 and 41 cross each other at their lower ends. Thus when the bars are moved downwardly in their guideways the wheel dressing elements 42 and 43 travel in diverging paths.

The frame plates 28 and 29 adjacent the guideways therein are provided with apertures within which are housed friction elements, which bear against the bars 40 and 41 to frictionally retain them in set position. These frictional elements each comprise a helical spring 44, one end of which bears against a threaded plug screwed into the outer end of the aperture and the other end of which bears against and urges a friction disc 45 against its bar.

Means are provided for moving the bars 40 and' 41 simultaneously in their guideways and comprise a pair of links 46 and 4'7, each of which has one end pivotally attached to their respective bars, and the other end pivoted to a fan-shaped arm 48. The arm 48 is secured to a shaft 49 rotatably mounted in an outstanding boss 50 integrally formed on the outer face of the plate 29. A handle 51 is secured by means of a set screw 52 to the shaft 49, so that said shaft may be manually rotated by movement of the handle.

Means are provided for adjusting the back plate 22, and the assembly carried thereon, relatively to the shaft 25 and. comprise a-knurled knob 53 secured by set screw 54 to a sleeve 55. The sleeve 55 is interiorly threaded so as to screw on the upper end of the rod 25, said rod being threaded to receive the same. The upper end of the sleeve 23 is exteriorly threaded to receive an interiorly threaded sleeve 56, the upper end of which is provided with an inwardly extending annular flange 57. The flange 57 engages and retains a bearing washer 58 interposed between said ilange and the top end of the sleeve 23.

Means are provided for moving the back plate 22, and assembly carried thereon, vertically on the guideways 16 and 17 in proportion to the movement of the grinding head 9 relatively to its work, and comprise a lever 59 which has one end pivotally mounted in a block 75 slidable horizontally between the opposed faces 76 of the bracket 60 secured to the grinding machine frame 6, and the other end pivotally and slidably secured to the shaft 25. The middle point of the lever 59 is provided with an aperture to receive a pivot pin 61, which is mounted through the ends of a yoke 63, the shank of which is threaded into the grinding head 9, and adjustably secured by a lock nut 64.

The connection between the lever 59 and shaft 25 comprises a sliding block 65 pivotally mounted on a pin 66, which passes through the ends of a yoke 67 provided at that end of the lever 59. The yoke 67 embraces opposite ends of the block 65 and the block 65, in turn, has its upper and lower sides embraced between the bifurcated ends of a bracket 68, which is rigidly secured on the reduced lower end of shaft 25 by a nut 69. The nut 69 clamps the bracket 68 against the shoulder formed by the reduction of size of the lower end of the shaft 25.

In the operation and use of this device, the sleeves 23 and 24 are loosened on the shaft 25 by unscrewing the clamping members 26 and 2'1, and the plate 22 vertically adjusted relatively to the grinding wheel 8 by rotating the knurled knob 53 in the proper direction. Graduations may be provided on this knob for aiding in the proper adjustment thereof. The clamping members 26 and 27 are then tightened, thus securing the sleeves rigidly to the shaft 25.

As the grinding head 9 is moved relatively to the work supported on the table 7, the plate 22, and assembly carried thereon, is moved vertically on guideways 16 and 17 through the medium of the lever 59 and yoke 63; the arrangement being such that the wheel dressing assembly device will be moved twice the distance travelled by the grinding head due to the multiplication secured through the lever 59.

The face of the grinding wheel 8 is dressed by the diamond-point elements 42 and 43 by movement of the handle 51, which, through the link connections 46 and 4'7, slide the bars 40 and 41 axially in their guideways. The angle of the bars 40 and 41, with respect to each other and with respect to the face of the grinding wheel 8, may be adjusted within certain limits by loosening the studs 31 to 34, inclusive, and shifting the frame plates pivotally about the pin 30. By measuring the distance from the stud 35 to the studs 36 and 37, carried by the plates 28 and 29 respectively, the exact positioning of the wheel dressing elements may be accurately determined.

Due to the lower ends of the bars 40 and 41 being crossed over each other, it will be apparent that downward movement of the bars will cause their lower ends to travel in diverging pathways and thus dress the face of the wheel from its outer sharp edge downwardly toward the body of the wheel, as otherwise a reverse movement of the wheel dressing elements would chip ofi and injure the fine edge of the wheel. v

The dressing device may, of course, be designed to move in a plane at any angle from 0 to 90 or more degrees relative to the line of movement of the wheel simply by modifying the shape of the arm or lever 59. Such a change in the relative direction of movement of the trimming device might be necessary in case of an auxiliary dressing or trimming device, or for any other reason. It may be thus understood that the particular case shown is but one particular embodiment of the broad invention.

The above may be illustrated by reference to the diagram in Fig. 11 in which the line A-B represents the line of movement of the wheel C which corresponds with the wheel 8. The lever D, corresponding to the lever 59, is pivoted at E, corresponding to the pivot point 61-of the lever 59, and which is fixed relative to the center of the wheel C. The end F of the lever D is engaged by the surfaces G, corresponding to the bracket 60, which are fixed relative to the frame of the machine, and the other end of the lever D is pivotally connected at H, corresponding to the pin 66, to the movable fixture J which carries the dressing elements for the wheel C, and which ismovable, relative to the wheel along the line K-L. The angle lVI between the lines A--B and K-L must, of course, equal the angle of deflection N of the lever D from a straight line. In all cases the distance which the dresser moves in relation to the wheel must equal the actual movement of the wheel.

Although but one specific embodiment of this invention has been herein shown and described, it

will be understood that numerous details of the construction shown may be altered or omitted without departing from the spirit of this invention as defined by the following claims.

What I claim is:

1. In a grinding machine, in combination, a bodily movable grinding wheel, a bodily movable trimming device, both of which are independently supported on a member, and a bar pivotally supported on one end, pivotally connected to said device on the other end and linked to said wheel support medially of said pivotsfor eflecting Proportionate but unequal simultaneous bodily movements when the wheel is bodily moved.

2. In a grinding machine, in combination, a bodily movable grinding wheel, a bodily movable trimming device, both of which are independently supported on a member, and a lever system operatively connecting said wheel and device for moving said device relative to said wheel in proportion to and a greater amount than the movement of said grinding wheel relative to the work.

3. In a grinding machine, the combination with ,a support, a grinding wheel supported on and movable relative to said support, a dressing fixture supported on and movable independent of said wheel, means for moving said wheel, a link system interconnecting the wheel and dresser and so constructed that a movement of the former causes the latter to move twice the distance thereof.

4. In a grinding machine, in combination, a. bodily movable grinding wheel, a bodily movable trimming device, both 01 which are independently supported, and a link system interconnecting said wheel and trimming device and so constructed that movement of the former causes the latter to move twice the distance thereof.

- HENRY Q. MUNN.

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