US2010536A - Abrasive applying machine - Google Patents

Description

Aug- 1935- 0. DOUTT ABRASIVE APPLYING MACHINE Filed Feb. 24, 1951 3 Sheets-Sheet l ['CJF Owen B05555.

Aug. 6, 1935. o. DOUTT 2,010,536

' ABRASIVE APPLYING MACHINE Filed Feb.' 24, 1951 s Sheets-Sheet 2 Aug. 6, 1935. o DQUTT 2,010,536

ABRASIVE APPLYING MACHINE Filed Feb. 24, 1931 3 Sheets-Sheet 3 Patented Aug. 6, 1935 T F C ABR A SIVE APPLYINGMACHINE Owen Dolitt, Detroit, Mich.,aSSignor to General Spring Bumper Corporation, Detroit, Mich, a corporation of Michigan l Application-February, 1931, Serial No. 517,666

T This invention has to do withmachines employed in applying abrasive to the peripheries of grinding wheels.

a In preparing a grinding wheel for use in grind l ing bumper bars and other articles, the periphery of the wheel is first coated with glue or other suitable adhesive and then pounded by hand into. a receptacle containing abrasive material such as powdered emery. Either one or several coats of abrasive may be applied. After being coated, the

wheel is employed in grinding operations until the adhesive is worn off, after which the process is. repeated.

While this process'results in much more satisfactory performance of the wheel, from many standpoints, not least among which is economy," longer life and a more uniform job, than istrue of a wheel prepared for grinding by applying abrasive by brushing or spraying or dipping the wheel in a paste, yet there are certain disadvantages. First, the pounding; being done by hand, necessarily results in an uneven distribution of theabrasive on the wheel. Moreover,due to the substantial weight of the wheel, the task is a very arduous one, so that the efiiciency of the worker declines as the day progresses. In addition, formity of pounding force" cannot be depended upon so that certain parts of the abrasive adheres to the wheel with less tenacity than the other parts. Also, the process consumes considerable time. F

. It is an object of the invention to provide means for pounding a grinding wheel into a' mass of abrasive, wherein the grinding wheel is resiliently supported. i F

A further object of the invention is to provide a machine for applying abrasive to a grinding wheel, embodying a belt drive directly from a motor to a rocker carrying the wheel.

-A further object of the invention resides in'the provision, in a machine of the character men ticned, of means for loosely holding grinding wheels so the latter may turn freely with respect thereto, said means embodying a bearing adapted to receive arbors of various sizes.

. Another object consists in the provision of; guardmeans to protect the operating mechanism against entry of abrasive material.

. In carrying out the invention," power from a motor is transmitted through a set of pulleys direct toa pair ofi oscillating lever arms. These lever arms are provided with snap catches to re ceive the mounting bar or arbor on which' the" wheel to be coated is placed. An easybar adjust?- ment' is provided .at the front of the machine.

to changethe distance between the mounting bar and the pan of emery to take care of various wheel diameters. Slight alterations can be made in the emery pan and support tray to accommodate wheels of increased dimensions if desired. The emerypan support tray is provided with steam or .hot' water I inlet and outlet openings whereby heat'canabe provided to keep the emery at the best possible temperature for proper ad-' hesion to the glue .on the wheel.

With amotor speed of 1200 R. P. M. the wheel to be prepared is pounded with considerable force into the emery pan about 120'times per minute with a. motion that keeps it rotating a. small amount at each stroke. This is continueduntil the entire circumference of the wheel is properly prepared to polish, at which time it is removed to. make. way for a freshly glued. wheel. A foot pedal is provided, pressure on-whioh raises the, wheel high enough, -if,necessary, to clear the pan for removal and for-easy insertion of the next wheel; 1 l

' A suitable switch is provided in front to stop and start the machine while thechange is being The lever armsor rockers are pivotally carried intermediate'their ends on cushioned supporting means. The forward ends of these arms receive thearbor on which thewheel is mounted when the wheel isto be coated with abrasive, the receiving portions including substantially 'V-shaped bearing'slots for accommodating arbors of varioussizes. Moreover, guard means serve to protect bearings of the operating mechanism against entry of abrasive which may be cast off the wheel during the process.

xFurther objects and advantages of this invention will appear as the description progresses.

:On the. drawings: :...'Figure 1- is a side elevation of a machine embodying my invention, partly broken away to show the relationship of the grinding wheels and the emery. j

' Figure 2 is a fragmentary front elevation of the same. i Figure 3 is a plan view of the same; Referring now more particularly to the drawings, wherein the same parts are indicated by the same reference characters, the machine embodying my invention'comprises a frame I having a table 2 and a superstructure 3. A motor 4 is mounted at the top of the superstructure 3, and the latter is provided intermediate its length with bearings Sin which. a crank shaft 6 is received. A portion ofthe crank shaft 6 extends laterally beyond the confines of the frame and superstructure as shown at l and carries a pulley 8 which is connected for rotation with the motor pulley 9 by virtue of a belt Ill.

The intermediate eccentric portion H of the crank shaft 6 is embraced at its ends by bearings [3 formed at the rearmost ends M of the rockers l5, and is connected to the shaft proper by arms !2. A substantially U-shaped guard l6 has its arms I? connected to the intermediate portions of the respective rockers l5. secured, by spot-welding or other suitable means, springs |8 extending forwardly and having their free ends so spaced as to yieldably engage the sides of a wheel H! to be prepared for grinding. The forward ends 26 of the rockers |5 are provided with V-shaped bearing slots 2| extending longitudinally and rearwardly of the rockers l5. Keepers or snap catches 22, carried by springs 23 mounted on the rockers l5, are adapted to partially close the slots 2| to thereby retain the ends of the arbor 24, about which the grinding wheel |9 is adapted to be disposed, during the operation of the machine, that is, while the wheel is being set up. It will be seen that the V-shape of the slots permits the slots to accommodate various sizes of arbors, and the beveled end 25 of each keeper 22 makes it possible to slip the arbor 24 by the keeper 22 by a cam action both in attaching and removing the arbor.

A pair of bars 26 are pivoted at one end at 21 to the rear of the frame I, the forward ends 28 of the bars 26 resting freely on the transverse rod 29, the latter fitting in cooperating recesses 30 disposed forwardly on opposite sides of the frame I. The recesses 30 are provided in series on each side so that the rod 29 may be disposed in any cooperating set of recesses to thereby support the free ends 28 of the bars 26 in various positions of elevation. Supporting rods 3| are carried by thebars 26 and are provided with collars 32, between which collars and the bars 2tv springs 33 are disposed, so that the rods 3| are resiliently mounted on the bars 26. The rods 3| pass through the bars 26, the openings being such as to permit a certain amount of pivotal movement of the rods 3| about the bars 26, in a substantially vertical plane. The uppermost ends of the rods 3| are pivotally connected at 34 to the rockers Hi, and it will be appreciated that by means of adjustment of the rod 29, the rockers l5 may be maintained in various positions of ele-' vation, to thereby accommodate various sizes of wheels |9 to be set up or prepared for grinding.

A foot iever 35 projecting forwardly of the frame I is pivoted within the frame at 36, intermediate the ends of the lever 35, and the rearmost end of the lever 35 is pivoted at 31 to a link 38, the upper portion of which is pivoted at 39 to an intermediate portion of the bar 26. It will now be appreciated that downward pressure on the lever 35 will result in actuation of the link 38 to raise the bar 26 about the pivot 21, thereby raising the rod 35 and rockers I5, whereupon the forward ends 2|] of the rockers l5 are brought to any desired position clear of the abrasive containingpan 48 so that the wheel |9 may be applied to and removed from the rocker IS without interference by any other portion of the machine.

The table 2 of the frame I supports the pan 40, containing preferably powdered emery 4|. The table is also provided with suitable instrumentalities 42 containing a source of heat for maintaining the emery 4| at the desired temperature in order that the emery 4| will adhere to To the arms I"! are the glue of the wheel IS with the desired degree of tenacity. Guard means 43 extends upwardly adjacent the rearmost portion of the pan All and serves to prevent access of emery to the hearings on the crank shaft.

In operation, the pulley 8 is driven preferably in the direction indicated by the arrow A from the motor 4 directly throughthe medium of the belt I0, and the ends M of the rockers if: have imparted to them a rotary motion by the eccentric portion H of the crank shaft 6. The pivots 34 between the rods 3| and the rockers l5 are thereupon given a substantially arcuate movement by reasonof the lower ends of the rods 3| being pivotally supported by the bars 25. The path of movement of the arbor 24 of the wheel to be set up is accordingly approximately circular, and the various positions of the bottom of the wheel I9 are substantially shown by the dotted line B. Of course, it will be understood that the wheel meets considerable resistance as it engages the emery 4|, which is maintained at a sufiicient level, taking its angle of repose into consideration, so that a substantial area at the bottom of the Wheel engages the emery.

The wheel having been previously coated along its periphery with glue or other suitable adhesive, it will be appreciated that, due to the rotary or sweeping motion of the wheel as it is pounded into the emery, and due further tothe fact that the arbor 24 upon which the wheel is mounted is loosely disposed in the slots 2| in the rockers E5 the wheel rolls along the emery during its contact therewith. Thus, when the wheel is next poundedinto the emery, a different portion of the glued surface of the wheel is brought into contact with the emery. In this fashion, upon successive strokes of the wheel, the entire periphery of the wheel will be pounded into the emery with uniform pressure and with an intensity of pressure which could not be accomplished by hand, so that in a matter of a few minutes, the wheel is completely set-up and may be employed for grinding purposes. With a machine of this character, it will be seen that while the wheel is being set-up, another wheel, unprepared, may be receiving its coating of glue, so that the only time lost is that required in snapping the arbor into and removing it from its bearings in the slots 2|.

From the direction of rotation of the pulley 8, it will be seen that the bottom of the wheel I9 will move in a direction indicated by the arrow in the dotted line B, so that the movement of the wheel as it is pounded into the emery is such as to maintain the arbor 24 in the innermost portions of the slots 2|. Thus, during the operation of the machine, the likelihood of accidental separation of the arbor 24 from the slots 2| is eliminated. Moreover, any emery that may be thrown off in the direction of the eccentric M will be caught by the guard 43.

It will be seen from the foregoing that wheels prepared with the present set-up machine are capable of a better grinding job .than those here tofore done by hand, because the machine can pound the Wheel into the emery harder and more evenly than is possible with hand pounding. Wheels produced near the close of working hours are as good as those produced at the start. Moreover, the emery clings to the glue longer, and the emery is more evenly distributed so that an all around better polishing or grinding job is possible. In addition, this machine will prepare a greater number of wheels than has heretofore been done by hand because the machine can be kept in constant operation pounding in the emery except for the time required to change the wheels. Moreover, during the operation of the machine, the operator may be kept busy gluing other wheels and changing them as fast as each wheel is completed. In addition, with the labor of pounding by hand eliminated, work can be scheduled so as to produce maximum results. 7

It will further be understood from the foregoing that the resilient support brought about by the employment of the spring 33v serves to absorb pressure incident to the oscillatory movement of the wheel l9 during the abrasive applying operation, so that a major portion of the stress due to the pounding action of the wheel in the emery is withstood entirely by the frame I.

The complete absence of gearing results in a reduction in the number of moving parts, with a corresponding decrease in vibration, cost and repairs. Suitable switch means for starting and stopping the machine are, of course, provided.

I am aware that many changes may be made and numerous details of construction may be varied through a wide range without departing from the principles of this invention, and I therefore, do not purpose limiting the patent granted hereon otherwise than is necessitated by the prior art;

I claim as my invention:

1. In a machine for pounding a glue coated wheel into a mass of abrasive, an oscillatory support for the wheel, means for detachably securing the wheel to the support, said means in-- cluding substantially V-shaped slots to receive the ends of wheel arbors of various sizes, and means for resiliently urging the arbor carried by the support inwardly of the slots.

2. An abrasive applying machine comprising means for supporting a mass of abrasive. means for carrying a wheel to which a coat of the abrasive is to be applied, instrumentalities for imparting an oscillatory movement to the second means, whereby to pound the wheel into the mass of abrasive, and a resilient support for said second means.

3. A wheel set-up machine comprising means for carrying a mass of abrasive, means for carrying a wheel to which a coat of the abrasive is to be applied, and instrumentalities for pounding the wheel thus carried downwardly away from said instrumentalities and into the abrasive so ,that the stress incident to the pounding action action will be at least partly taken up by said instrumentalities, said first means including slots .open forwardly to receive an arbor on which the wheel is mounted, and extending rearwardly toward said instrumentalities, whereby the abrasive encountered in the downward movement of the wheel will urge the arbor inwardly of the slots, and means resiliently retaining said arbor in said slots, and being disposed forwardly of the slots, whereby the last named means is unaffected by the pounding action.

5. In a machine for applying abrasive to a glue coated grinding wheel, a frame, a shaft mounted on said frame, said shaft carrying a crank, a pair of rocker arms pivoted to said crank, means for yieldably constraining downward motion of each of said arms with respect to said frame, and means carried by said arms for receiving an arbor of a grinding wheel.

6. In a machine for applying abrasive to a glue coated grinding wheel, a frame, a shaft mounted on said frame, said shaft carrying a crank, a pair of rocker arms pivoted to said crank, means for yieldably constraining downward motion of each of said arms with respect to said frame, means carried by said arms for receiving an arbor of a grinding wheel, and means rigidly connecting said arms in spaced relation.

7. In a machine for applying an abrasive to a glue coated grinding wheel, a. rocker, means for actuating said rocker, means providing a resilient support for said rocker, said rocker having means for loosely holding a grinding wheel, and means for supporting a mass of abrasive material in juxtaposition to the wheel thus held, whereby upon actuation of said rocker, the wheel will be pounded into said material with a rolling action.

8. In a machine for applying an abrasive to a glue coated grinding element, a rocker, means for actuating said rocker, said rocker having means for holding a grinding element, andmeans for supporting a mass of abrasive material in juxtaposition to the element thus held, whereby upon actuation of said rocker, the element will be pounded into the mass of abrasive material,

a movable support for said rocker, means for yieldably supporting said movable support, and instrumentalities for adjusting said element holding means relative to the abrasive material to accommodate different sizes of grinding elements to which said material is to be applied.

9. In a machine for applying an abrasive to a glue coated grinding element, a rocker, belt means for actuating said rocker, a yieldable support for said rocker, said rocker having means for holding a grinding element, and means for supporting a mass of abrasive material in juxtaposition to the element thus held, whereby upon actuation of said rocker, the element will be pounded into the mass of abrasive material.

CERTIFICATE 0F CORRECTIQN.

Patent No. 2,910,536. August 6, 1935.

OWEN DUUTT.

it is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 3, first column, iine 46, claim 2, eiizer "means" and before the comma insert the words to absorb shocks and reduce vibration due to such pounding; and that the said Letters Patent should be read with this correction herein that the same may conform to the record of the ease in the Patent @iiiee.

Signed and sealed this 24th day of September, A. D. 1935'.

Leslie Frazer (See!) Acting Commissioner of Patents.

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