US2300431A

US2300431A - Wheel dressing

Info

Publication number: US2300431A
Application number: US413453A
Authority: US
Inventors: John P Murray
Original assignee: Individual
Current assignee: Individual
Priority date: 1941-10-03
Filing date: 1941-10-03
Publication date: 1942-11-03
Anticipated expiration: 1959-11-03

Description

Nov. '3, 1942. J. P. MURRAY 7 2,300,431

WHEEL DRESSING Filed Oct. 3, 1941 Murray Patented Nov. 3, 1942 I U N iT-E D STAT (Granted under the act of March a, 1883, as 2 amended Apriliii), 1928; 370 '0. G. 757) j The invention described herein may be manufactured and used by or for the Governmentfor governmental purposes, without the payment to me of any royalty thereon.

. This invention relatives to abrasive wheels and more particularly to the dressing or resurfacing thereof. s

. Conventional wheel dressing operations involve certain undesirable hazards to men and machineryin the vicinity. One of the most serious of these hazards concerns the large amount of abrasive dust thrown into the air in the dressing of dry wheels. Due to the high velocity of the wheel being dressed small abrasive particles are Widely scattered in the surrounding area to be breathed by the workmen in the vicinity and liable to leave a destructively abrasive deposit on the Working surfaces of nearby machines and equipment.

Another serious hazard in ordinary wheel dressing operations is due to the fact that at least a part of the operators body is directly in line with the wheel being dressed. In the event of the bursting of a defective wheel, fragments of the wheel may escape the standing guards and occasionally are thrown violently in the direction of the operator with attendant physical injury.

It is the object of this invention to produce a Wheel dressing device which avoids the discharge of abrasive dusts into the surrounding air.

It is a further object of this invention to increase the safety and accuracy with which a wheel may be dressed.

It is also an object of this invention to greatly prolong the useful life of wheel dressing devices.

The exact nature of the invention as well as other objects and advantages thereof will clearly appear from the description of a preferred embodiment as shown in the accompanying drawing in which:

Figure l is a perspective View of a conventional wheel dresser modified in accordance with my invention.

Figure 2 is a similar view of a wheel dresser embodying another form of my invention.

Figure 3 is a side elevation showing a modified form of coolant supply.

Figure 4 is a side elevation, partly in section, showing the wheel dresser and guide plate in operative position on a tool rest.

It has been observed that in the dressing of wet wheels the water in contact with the tool at the point of dresser action obviates the discharge of abrasive dust. My invention consists in the provision of means for dispersing water or other coolant through. the medium of the wheel dressing device to avoid dust discharge and to prolong the life of the wheel dressing discs or wheels. I p

Referring to the drawing by characters of reference there is shown in Fig. 1 a fragment of an emery wheel 1 and a tool res-t2 therefor. Seated on thetool restZ is a guide plate 3 to provide a plane surface for the support of the wheel dresser i. Thewheel dresser comprises a plurality of dresser wheels 5 rotatably supported in a bonnet 6; The bonnet is provided with guide lugs no engage the tool rest or guide plate and with a handle 8' permitting the dresser wheels to be held against the abrasive wheel. and moved across the face thereof. An aperture 9 is formed in the dresser bonnet t in which a tube H] is secured. -The tube Ill leads to a coolant bulb H preferably supported on the handle adjacent the grip thereof. This bulb may be either of the type shown or of the type employing builtin inlet and outlet valves and adapted to' act as a pump from an external supply of fluid.

As is well known a wheel may be dressed by engaging the guide lugs with the guide plate or tool rest in which position raising of the extremity of the handle will tend to rotate the dresser about the point of engagement of the guide lugs with the guide plate, bringing the dresser wheels into operating relation with the abrasive wheel. The dresser may then be moved laterally across the working face of the abrasive wheel. Prior to this operation the bulb is filled with water or other cooling fluid and as the dresser wheels operate in resurfacing the wheel a steady pressure on the bulb supplies a continuous flow of cooling fluid to prevent fine dust from being thrown into the air and to cool the dresser wheels, thus increasing the life thereof.

In the modification of my invention shown in.

Figure 2 means have been provided making it possible for the operator to avoid getting any part of his body into the zone in which fragments would be thrown in case of the bursting of a defective wheel. show a wheel la, a tool rest 2a, guide plate 3a and wheel dresser 4a. The wheel dresser com prises rotating dresser wheels 5a and a bonnet 6a supporting and guarding the same. Guide lugs la are provided on the bonnet to engage the tool rest. A handle I2 is provided on the bonnet in parallel relation to the axes of the dresser wheels and of the wheel being resurfaced;

In this figure there is.

A grip [3 at right angles to the handle proper is provided to which pressure may be applied tending to rotate the device about the guide lugs Ia into contact with the wheel while the tool is reciprocated across the face of the wheel being dressed. A coolant tube [a leads to a bulb Ila supported on the handle adjacent the grip and cooling fluid is supplied as in Fig. 1.

Figure 3 shows an optional means of supplying water or other coolant to the tool. A coolant tube lflb is led through a bore in the grip to a valve l4 mounted thereon. A tube [5 leads from the valve to a suitable liquid supply source such as a tank or pipe line.

One of the important factors necessary to the proper and efficient dressing of grinding wheels is a true support for the wheel dressing equipment. Obviously a smooth top face and straight edge are required for best results. Normal usage of grinders usually results in wear and distortion of the tool rest provided as a part of the grinder proper and the face of the tool rest thus becomes unsatisfactory for use as a guide for resurfacing the wheel. In order to remedy this situation holes l6 are provided in the top face of the standing tool rest 2 as shown most clearly in Figure 4. A guide plate 3 having pins ll adapted to engage the holes I6 is seated on the rest 2. As the guide plate is removable and a part of the wheel dressing equipment it will not receive the wear of ordinary grinding operations and as the wear actually attendant upon the dressing operation is very slight the plate should have a long life. Should it become worn, resurfacing can be readily accomplished. Such a removable guide plate will always present a true surface to receive the guide lugs I on the wheel dresser.

Obviously the usefulness of the invention is not limited to dressing devices employing rotary dressing wheels, as it will be equally satisfactory with dressers employing relatively fixed devices such as diamonds or other cutters.

I claim:

1. In a grinding wheel dresser having a handle and means for supporting a dressing tool, a coolant tube secured at one end to said supporting means in position to discharge fluid adjacent the point of contact of the dressing tool with the grinding wheel, and a coolant bulb supported adjacent said handle and having its interior in communication with the other end of said tube whereby coolant fluid may be discharged from said bulb through said tube.

2. In a grinding wheel dresser having a handle and means for supporting a dressing tool, a coolant tube secured at one end to said supporting means in position to discharge fluid adjacent the point of contact of the dressing tool with the grinding wheel, the other end of said tube being in communication with a supply of coolant fluid.

3. In a grinding wheel dresser having a handle and means for supporting a dressing tool, a coolant tube secured at one end to said supporting means in position to discharge fluid on said dressing tool, a valve on said handle in operative relation with the other end of said tube; and a supply tube leading from said valve to a source