US1444314A - Grinding or polishing roller - Google Patents

Description

Feb. 6, 1923. LMLM.' A I A 0. G. HERDER.

GRINDING 0R POLISHING ROLLER. FILED ocr. 2o, 1921.

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Patented Feb. t5, i923.

UNTED STATES CHARLES G. HERDER, OF LOUSVILLE, KENTUCKY.

GRNDING OR POLISHING ROLLER.

Application iiled October 20, 1921.

i o all whom it may concern.'

Be it known that l, CHARLES G. Hannan, a citizen of the United States. residingat Louisville, in the county of Jefferson and State of Kentucky, have invented certain new and useful Improvements in Grinding or Polishing Rollers; and l do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in grinding and polishing rollers and more particularly to those in which the sheet of abrasive or polishing material is backed up by a pneumatic cushion instead of the usual padding.

ln carrying` out my invention, I provide ra pair of axially alined heads around which the ends of an inflated tube are secured and one object of my invention is to mount said heads so that they may move outwardly a predetermined distance when the tube is inflated. By having the heads normally rather close together, the tube may be secured thereto much more easily than could otherwise be accomplished, and furthermore, it is advantageous to have the heads move outwardly when the tube is filled with air, so as to draw the sheet of polishing or grinding` material to the desired degree of tightness.

A further object of the invention is to provide means for holding the two heads against any other relative movement after they have moved outwardly under air pressure to a pre-determined extent.

A still further object is to make novel provision for renewing the grinding or polishing sheet without disturbing the air cushion.

lVith the foregoing in view, the invention resides in the novel subject matter hereinafter described and claimed, the descriptive matter being supplemented by the accompanying drawings:

Figure 1 is a longitudinal sectional view, partly in elevation, showing my invention before the sheet of abrasive or polishing material isattached and the device inflated.

Figure 2 is a view similar to Fig. 1 but illustrating the tube inflated, the heads separated and the abrasiveor polishing sheet secured and stretched in place.

Figures 3, 4 and 5 are transverse sectional views as indicated by the lines 3-3, 4 4 and 5-5 of Fig. 2.

Serial No. 599,161.

In the drawings above briefly described, the numerals 1 and 1a designate a pair of circular heads which are positioned in axial alinement, and as here shown, are provided with inner and outer shaft sections 2 and 2"* respectively, said shaft sections being splined or keyed together as indicated at 2:5, that while they may relatively slide to permit inward or outward movement of the heads 1 and 1a, no relative rotation of said heads and shaft sections is permitted. rlhe outer ends of the heads 1 and 1L are provided with stubs e; and 11a, one of which is provided with a smooth extension 5 for connection in any suitable manner with the arbor of a grinding or polishing machine. yllhe stub ein may well be provided with an extension 5 to travel in a supplemental bearing to prevent possible whipping of the device. lll/lith the heads 1 and 1a moved inwardly to the positions shown in Fig. 1, a rubber air tube G is applied thereto as shown in Fig. 1, the ends of the tube being` positioned around the heads and turned inwardly at 7 upon the outer sides thereof, said inwardly turned ends being secured in place by means of clamping collars 8 which are secured to the heads by screws or the like 9. The heads 1 and 1a are preferably tapered to some eX- tent as shown and provided with external ribs 1() at their larger ends, and the clamping collars are preferably formed with ila-red flanges 11 surrounding the tapered portions of the heads and engaging the end portions of the tube. rl'his construction serves to more readily clamp the tube ends against the heads in a fluid tight manner.

lll/hilo any desired means may be provided for inflating the tube 6, I prefer to form a port 12 through the head 1a, its stub d and extension 5, the outer end of said port being equipped with an appropriate check valve 13 to which a pump or air line may be connected. llVhen the tube is inflated, the air pressure forces the heads 1 and 1a to move outwardly away from each other as will be seen by comparing Figs. 1 and 2, and to lock the shaft sections 2 and 2a of said heads together, when this outward movement has taken place, I provide a. spring-carried locking pin 14k on the outer shaft section receivable in a socket 15 in the inner section. The outward movement of the heads 1 and 1a is advantageous to draw the sheet of grinding or polishing material 16 taut and furthermore, it is much easier llO to insert the heads l and 1"' in the ends o' the tube 6 and secure said ends to said heads, before any stretchingv ol the tube is produced, since otherwise the ends of said tube would tend to withdraw from the heads l efore they could be tightly clamped in place.

The grinding or polishing sheet lll is formed into a tube whose ends are slit and turned inwardly upon the outer iaces ol" the collars or rings S, said ends being; clamped in position by clamping rings l? "threaded on the stubs land da. rlhese r are preterably provided with sockets le 'to permit the use of a Spanner l'or tinninY them. By

preference, the rings li" are not tig to the maximum entent until aft-Gr the tube 6 is inflated and the heads and l have moved outwardly, substantia y to the end of their travel. The rings l? are then tightly threaded in place to hold the ends of the sheet 1G against slippage, so that the complete inllation or the tube (5 and n aximum outward movement olf the heads l and lZL will tightly stretch the sheet lll, so as to produce the most advantageous results. lVhile this sheet preferably extends straight between the heads as seen in Fig'. 2, it will be understood that by inl'lating the tube G to a greater extent, said tube and sheet may be outwardly bowed if this is desirable lor any particular class oit work. ln all cases, the grinding or polishing sheet is backed up by an air cushion which gives much better results than the usual padding.

Since excellent results may be obtained with the construction and arrangement herein shown and described, this is taken as the preferred embodiment of the invention. However, l wish it to be understood that minor changes coming` within the scope of the invention as claimed may be resorted to if desired.

l claim:

l. A device of the class described coinprising a pair of axially alined heads relatively movable away from each other .iu the direction oi their axis, an elastic tube hav ing its ends secured around said heads in Latas 1a an air tight manner, means for securing a sheet of grinding or polishing` material to said heads around said tube, and means whereby said tube may be inflated and said heads thereby forced outwardly away from each other'.

2. A device ol' the dass described comprising a pair of axially alined heads relatively movable away trom each other in the direction of their axis, an elastic tube having its ends secured around said heads in an air tight manner, means for securing' a sheet ol grinding' or polishing' material to said heads around said tube, means whereby said tube may be inflated and said heads `thereby forced outwardly away from each other, and means :tor holdinkcV said heads in the relative positions to which they are forced.

3. A device of the class described comprisino' pair of heads axially alined with each other and provided with telescoping shaft sections, an inflatable tube having' its ends secured around said heads, inflation of said tube serving' to force said heads outwardly away from each other, and co-aeting latch means on said shaft sections for holding them against relative lmovement when said heads have moved outwardly to a predetermined extent.

4. A device oi the class described comprising a pair of circular heads mounted in axial alinement and having' central outwardly extending stubs, an inflatable tube having its ends positioned around said heads and turned inwardly upon the outer sides thereoi, clamping' rings surrounding' said stubs and secured to said heads to clamp the tube in place, a sheet of abrasive or polishing' material around said tube ha y'in c; its ends turned inwardly against the outer sides of said clamping rings, and other clamping rings threaded on said stubs to clamp the ends of said sheet against said lirst named rings. Y

ln testimony whereof l have hereunto set my hand.

CHARLES G. l'llllllll.

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