US2515091A - Dressing holder for grinding wheels - Google Patents

Description

July 11, 1950 H. H. MAY 2,515,091

DRESSING HOLDER FOR GRINDING WHEELS Filed Sept. 27, 1946 2 Sheets-Sheet 1 Fg-JE.

INVENTOR H UBERT H. MAY

ATTORNEY July 11, 1950 H. H. MAY 2,515,091

DRESSING HOLDER FOR GRINDING WHEELS Filed Sept. 27, 1946 2 Sheets-Sheet 2 INVENTOR HuBERT H. MAY

BY W I @499 ATTCRNEY Patented July 11, 1950 DRES SING HOLD FOR GRINDING HEELS Hubert H. May, Hartford, Conn.

Application September 27, 1946, Serial No. 699,616

3 Claims.

This invention relates to an improved dressing and dressing holder for grinding wheels. While not limited thereto, it has particular application to a new and improved device for dressing grinding wheels at relatively short intervals so as to allow efiicient use of the wheels for prolonged periods of time.

The new and improved device is particularly useful where a handy dressing device is desired as a readily available part of the grinding wheel installation. The device is therefore easy to install and readily operable and permits manipulationat maximum speed.

In accordance with one preferred form of the invention an abrasive dressing is adjustably held in position by means of a simple and eificient holder hugging the abrasive bar and preventing undue vibration due to the dressing action yet permitting ready adjustment when the dressing surface is worn down.

In accordance with another phase of this invention, a new pointed metal dressing device is attached to the same dressing holder permittihg ready use in adjusting the dressing of the grinding wheel, and in roughing it up during, after and before the grinding operation.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawings, and to the appended claims in which the various novel features of the invention are more particularly set forth.

In the accompanying drawings forming a material part of this disclosure:

Fig. l is a perspective side view showing a grinding wheel with one preferred dressing device made in accordance with the instant invention in position as during the dressing operation.

Fig. 2 is a lengthwise central cross section of the dressing device illustrated in Fig. 1.

Fig. 3 is a perspective view of another embodiment of the instant invention showing a new and novel star shaped metal grinding tool in position.

Fig. 4 is a partial vertical section of the deviceof Fig. 3 taken on the line 4-4.

Fig. 5 is a perspective view of a further modification of the present invention.

Fig. 6 is a partial vertical sectional view taken on the line 6-6 of Fig. 5.

Fig. '7 is a perspective view of another preferred form of the invention using the abrasive dressing bar and the dressing tool in its disengaged position.

Fig. 8 is a vertical section through the holding 2 and the position-locking means taken on the line 88 of Fig. 7.

Fig. 9 is a vertical section through line 9 -9 of Fig. 8.

Fig. 10 is a vertical section through line lik of Fig. 8.

Fig. 11 is a perspective side view of the device of Figs. 7-10 taken from the side opposite to the one in Fig. 7 and showing the device in position for simultaneous operation of dressing stoneand wheels.

Fig. 12 is a perspective view of the protectiv cover shown in Figs. 5 and 6.

In the preferred embodiment of the invention, an abrasive dressing stone II is supported on a base I6 by a holder I2 hugging the stone. and covering its lower side as well as the major part of two of the side portions. The base Ill may be secured in a clamp (not shown) fixed relative to the grinding wheel. The dressing stone II is securely held by the abovementioned holder I2 and a clamping device I3 which may be tightened or adjusted by means of clamping screw l4 resting on washer I5 in turn resting on the clamping device I3 which in turn engages a. longitudinal slot IS in the wall of said holder I2. The tip of the dressing stone I I engages abrasive grinding wheel.

It will be readily seen from Figs. 1-2 and from the above description that in operation the clamping screw I4 is first loosened and the clamping device I3 pushed in loose position toward the rear of the slot I6 permitting dressing stone II to be inserted between the sidewalls of the holder I2 and between the bottom wall of said holder I2 and the clamping device I 3. Clamp I3" is now advanced pushing the dressing stone II toward the grinding wheel I'I. When operative contact is made between grinding wheel I1 and dressing stone I I, the clamping device I3 is adjusted by means of clamping screw I4 so as to permit tight positioning of dressing stone II within its confines.

In accordance with another phase ofthe instant invention illustrated in Figs. 3 and 4 a metallic disc dressing tool I8 consisting of teethed' star-shaped dressing discs I9 and round dressing discs 20 in alternating positions is held in secure operating condition on an axle 2| lockedby means of locking nut 22 in holding device I2. This holding device I2 is formed with a base l0 so that it may be supported in the aforementioned clamp, and a curved front portion II) which acts as a safety shield over the star-shaped dressing discs I9. I f I In the modification of the invention shown in Figs. 5 and 6 an adjustable non-breakable plastic protector 24 is secured to the top of holding device l2 when using it in this or similar connections so as to prevent accidents.

In the embodiment of the invention shown in Figs. 7-11 the device shown in Figs. 1-2 is held in position on holder I2 above sheet metal arms 25 which may be welded to the bottom of holder I2, extending at an angle from said holder l2 and carrying axle 2! locked in position by means of lock nut 22 while securing the abrading dressing discs 18.

While insertion of the dressing devices H and "I8 is as simple with the new device as with the above described embodiment of the invention, the new device may readily be swivelled around cen- 'tral axle 26 so as to alternatively bring into op-- erating position either abrasive dressing stone H as shown in, Fig. 7 or abrasive dressing discs l8.

Various holding devices may be utilized. to adjustably hold the device of Figs. 7-13, butI prefer the one illustrated in these views which utilizes tooth 28 fitting securely into spaced grooves 21 of positioning and holding arms 26 which may. be attached to holding means for the wheel or be supported separately. One of the two cooperating holding arms v2'6 harbors a compression spring 30 resting upon vertical inside wall 33 and urging a hollow head 29 towards the side wall of support l2.

When adjusting the position the holding device I 2 is pressed so as to compress spring 30, tooth 28 is placed in front of any desired cooperating groove 2T and the device is then released securely lockingit in place.

The head 29 carries a trunnion 2% which engages a complementary socket member it on the sidewall of the holder or trough E2. The opposite side wall of the holder or trough l2 has a trunnion' I2'b which extends into complementary socket 26 formed in the respective axle 26, see Fig. 8.

A device has thus been created combining. easy operation with improved dressingproperties and permitting satisfactory adjustment of grinding stone in their operation.

While I have illustrated and described the preferred embodiments of. my invention, it is to be understood that I do not limit myself to the precise constructions herein disclosed andthe right is, reserved to all changes and modifications corning within the scope of the invention as defined in they appended claims. I

Having thus. described my invention, what I claim, as new, and. desire to secure by United States Letters Patent is:

1. A grinding wheel. dresser comprising a trough having a fiat bottom and shallow sides at right angles thereto, said trough being open at its front end,. a grinding stone havin abeveled front edge slidably mounted in said trough, said troughbottomhaving a longitudinal centerslot, a clip having aright angle. flange for engagingthe top and rear edge of. said stone, a portion extending, rearwardly from, said clip parallel to and spaced from. said bottom, a. rear vertical flange at right angles to said portionand engaging. said trough bottom, said portion having a hole in line with said slot, a bolt passing. through said slot and said hole whereby said clip and. stone can be adjusted longitudinally offsaid. trough to extend the beveled edge of. said stone. for engaging. a grinding'wheel, forwardly inclined depending legs attached at their upper ends to the side edges of either said grinding stone or said abrading wheel engages the grinding wheel.

2. A grinding wheel dresser comprising a trough having a fiat bottom and shallow sides at right angles thereto, said trough being open at its front end, a grinding stone having a beveled front edge. slidably mounted in said trough, said trough bottom having a longitudinal center slot, a clip having a right angle flange for engaging the top and rear edge of said stone, a portion extending rearwardly from said clip parallel to and spaced from said bottom, a rear vertical flange at right angles to said portion and engaging said trough bottom, said portion having a hole in line with said slot, a bolt passing through said slot and said hole whereby said clip and stone can be adjusted longitudinally of said trough to extend the beveled edge of said stone for engaging a grinding wheel, forwardly inclined depending legs attached at their upper ends to the side edges of said trough bottom and extending to the front edge of said. trough at a distance therebelow, a cross. shaft journalledin-the bottoms of said legs, an abrading wheel on said shaft including a row of alternate toothed and smooth discs for abrading the grinding'wheeL. and a pivotal mount engaging the shallow sides of said trough whereby either said; grinding stone or said abrading wheel maybe brought into, operative position with relation tothe grindingv wheel.

3. A grinding wheel dresser comprising a trough having a fiat bottom and shallow sides at right angles thereto, said trough being open at its front end, a grinding stone having a beveled front edge slidably mounted in said trough; said trough bottom having a longitudinal center slot, a clip having a right angle flange for engaging the top and rear edge of said stone, a, portion extending rearward-1y from said clip parallel'to and spaced from said bottom, a, rear vertical flange at right angles to said portion and engaging said trough bottom, said portion having a hole in line with said.slot,.a bolt passing through said. slot and said hole whereby said clip and stone can be adjusted longitudinally of said trough to extendthe beveled edge of said stone for engaging a grinding wheel, forwardly inclinedv depending legs attached at their: upper ends to the side edges of said trough bottom and extending to the front edge of said trough" at a distance therebelow, a cross shaft journalled in the bottoms of said legs, an abrading" wheel on said shaft including a row of alternate toothed and smooth discs-for abrading the grinding wheel, and'a pivotal mount for said trough whereby either said grinding stone or said. abrading' wheel may be brought into operati-ve position with relation to the grinding wheel, said mount including two transversely spaced posts, each having a toplug extending laterally toward said trough,- one of said lugs having acircular socket and said trough sidewall adjacent thereto having a trunnion insaid socket,

the other of said lugs havinga circular chamber opening through the free end of said lug by means 5 other side wall of said trough in line with said trough trunnion, and a spring in said chamber urging said cylinder toward said trough.

HUBERT H. MAY.

REFERENCES CITED The following references are of record in the file of this patent:

Number 6 UNITED STATES PATENTS,

Name Date Van Orman Mar. 14, 1916 McConnell June 28, 1932 Conner July 23, 1935 Ferragno Apr. 21, 1942 Canning Dec. 21, 1943

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