US1929274A - Abrasive element - Google Patents

Description

Oct. 3, 1933.

ABRAS I VE ELEMENT Filed July 18, 1929 INVENTOR. cffZ/r'am $63726 A TTORNEYS w. J. ELLIS 1,929,274-

Patented Oct. 3, 1933 a ABRASIVE ELEMENT William J. Ellis, Cleveland, Ohio Application: July 18, 1920. i Serial No. 379,240

3 Claims.

to an abrasive element, is particularly directed to a tubular, abrasive element or so-called sleeve and to a new improved and more economical 5 method of manufacturing the same. The principal object of the invention is the provision of a simple and inexpensive sleeve and the method of making same which shall be very much moresimple and shall at the same time produce a very much stronger sleeve than those now. in

general use.

To the accomplishment of the foregoing and related ends, said invention, then, consists of the means and steps hereinafter fully described 1 and particularly pointed out in the claims; the annexed drawing and the following description setting forth in detail certain means and one mode of carrying out the invention, such disclosed means and mode illustrating, however, but one of various ways in which the principle of the invention may be used.

In said annexed drawing:-

Pig. lis a view in perspective of my improved 1 abrasive element; Fig. 2 is a plan'viewof a sleeve of abrasive coated fabric for use in making the sleeve of Fig. 1; Fig. 3 is a section on the line 33. Fig. 2; Fig. 4 is a side elevation of a formed 7 sleeve; and Fig. 5 is a view in perspective of a' modification of my improved sleeve. 3 An abrasive sleeve consists of a hollow tubular element formed of a layer of suitable support-. ing material, such for example as fabric or some kind of paper stock, the outer surface of which is coated with an adhesive and a layer of abrasive. These sleeves are putto numerous uses,

being formed in various sizes and being. employed insurfacing convex portionsof metal and woodpanels. castings and the like, while smaller sleeves re used for. many other purposes, such for exi0 ample as the grinding down of very small castings of precious and semi-precious metals and for the finishing of small objects of porcelain or similar materials.

My improved sleeve consists, briefly stated. of

415 a spirally wrapped sheet of abrasively coated maas applied over a portion of surfacecnly, ex-

adjacentedgosorsidesof' The present invention, relating, as indicated,

tending from the edge 5 to a line 6 parallel with the edges 5 and 7 of the strip. It is immaterial as to whether the uncoated portion 8 of the strip 1 is first coated with abrasive and the abrasive then removed or is in some way left uncoated during the coating operation applied to the ini-- tial sheet.

I'he strip 1 I then wrap spirally upon itself, this operation being performed either manually v or by suitable machines in such a way as to cause W the coated portion of the sheetto overlap and engage against the portion of the sheet 8. The process is substantially that' of twisting a paper strip about itself to form a spiral tube. except that the coated abra'sivestrip is here so wrapped that itengages'only over the uncoated portion of the sheet, thus providing a substantially smooth unbroken surface of abrasive on the outer surface of the resulting tube.

In Fig 4 I have shown the abrasive strip 1 so wrapped upon itself as to produce a spirally extending Joint 10 between the adjacent abrasive layers 11 and 12. The portion 12 engages upon the uncoated portion 15.0! the next convolution of material, and by spreading a suitable layer of. adhesive upon this uncoated portion of the strip before the latter is, thus wound, it is possible to produce a integral spirally wound tube 'which may be cut into cylindrical sleeves 18, i7, 1;, etc., of any desired In Fig. 5 I have a modification of the sleeve previously described, this modification consisting in the use of a hollow tubular supporting mandrei-m-within the sleeveproper. The use of this mandrel, while not necessary, is sometimes an advantage, both manufacture of the sleeve and also in its use.- In manufacturing the sleeveitis'ofcoursenecessarytousesome sort of a removable mandrel on which to roll up the 06- abrasive strip, and if the permanent mandrel 20 is employed it can be used in long lengths, about which the strip can then be coiled and can be conveniently cut of! at time as the strip.

The mandrel may be formed of paper, cardboard loo or similar inexpensive material. A further advantage in the manufacture of the sleeve with the use of the mandrel is that the uncoated edge portion 8 of the strip 1 may then be omitted, the

abrasive strip being coiled spirally about the man:- 106 sleeveisusedonanexpandingmandrejlofthello" usual type the ends of the sleeve are expanded more than the central portion, producing a convex surface from end to end of the sleeve instead of a perfectly straight cylindrical surface as desired. With a pasteboard mandrel within the sleeve the expanding pressure is applied against the mandrel instead of against the sleeve proper and no'unequal expansion can occur.

The present sleeve has the advantage over those now manufactured of having a very much stronger joint between the adjoining portions than it is possible to secure in the tongue and grooved joints which are now commonly used. This joint is extremely strong and offers no. objection in use since there is no extending projection or seam at the joint between adjoining convolutions. In manufacture, the present method presents several advantages, the most important of which is that sleeves may now be formed continuously in long lengths of stock and by automatic machinery, after which the resulting long lengths may be cut into any desired lengths for various uses.

Other forms may be employed embodying the features of my invention instead of theone here explained, change being made in the form or construction, provided the elements stated by any of the following claims or the equivalent of such atafted elements be employed, whether produced by my preferred method pr by others embodying steps equivalent to those stated in the following claims. v

I therefore particularly point out and distinctly claim as my invention:---

1. In a method of making a tubular abrasive element, the steps which consist in wrapping spirally upon a hollow mandrel an abrasive coated strip with the edges of adjacent convolutions in contact'with each other, and securing said strip to said mandrel by interposing a layer of adhesive,

2. In a method of making a tubular abrasive element, the steps which consist in wrapping spirally upon a hollowymandrel an abrasive coated strip with the edges of adjacent convolutions in contact with each other, securing said strip to said mandrel by interposing a layer of adhesive, and then cutting cylindrical blanks from said wrapped mandrel.

3. An abrasive element comprising a hollow cylindrical mandrel and a spirally wrapped abrasive coated sheet adhesively secured to said mandrel and completely covering the outer surface thereof, the convolutions of said sheet having adjacent edges in contact without overflowing.

- WILLIAM'J. ELLIS.

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