Abrading tool

June 12, 1956

2,749,680

Z. O. ST. PALLEY

ABRADING TOOL

Filed June 8, 1954

<img file="US2749680A_D0001.tif" />

<img file="US2749680A_D0002.tif" />

<img file="US2749680A_D0003.tif" />

<img file="US2749680A_D0004.tif" />

<img file="US2749680A_D0005.tif" />

INVENTOR.

0.

United States Patent Office

2,749,680

Patented June 12, 1956

2,749,680

ABRADING TOOL

Zoltan O. St. Palley, Branford, Conn.

Application June 8,1954, Serial No. 435,165

Claims. (Cl. 51—193) ¹⁰

My invention relates to an abrading tool, and is par- 15 ticularly adaptable for grinding, buffing and polishing by means of portable and flexible shaft operated devices^ ? One of the principal objects of my invention is to provide an abrading tool which may be prepared on the field by the operator, employing strips of abrading material 20 easily available in the commerce, the cost of which is considerably lower than the prefabricated abrading tools, greatly reducing thereby the operating expenses of the abrading operations.

Another important object of my invention is to provide 25 an abrading tool in which the abrading strip is satisfactorily secured in position without the use of an adhesive so that the abrading strip may be quickly and easily removed and replaced.

Another important object of my invention is to provide 30 an abrading tool in which, due to the lack of adhesives, the roll of abrading strip has a greater resiliency and a better cushioning effect than the prefabricated abrading tools, resulting in an increased efficiency and higher quality of the abrading. 35

Another important object of my invention is to provide an abrading tool in which the mechanism securing the abrading strip has a self tightening feature, contributing greatly to the safety of the operator.

A further important object of my invention is to pro- 40 vide an abrading tool which can employ abrading strips of all types and grit sizes and, due to the ease of the * replacement of the strip, can offer to the operator a choice , in the type and grit size of the abrasive which, with pre' fabricated abrading tools, can be obtained only at the 45 cost of a large investment.

Other objects and advantages of my invention will be apparent during the course of the following description.

In the accompanying drawing, forming a part of this application, wherein, for the purpose of illustration, are 50 shown a preferred and also alternative forms of my invention,

Figure 1 is a side elevation of the preferred form of my abrading tool,

Figure 2 is a longitudinal sectional view of the same, 55

Figure 3 is a transversal sectional view on the line

3—3 of Figure 1,

Figure 4 is a longitudinal sectional view of a part of an alternative form of my abrading tool,

Figure 5 is a longitudinal sectional view of another βθ alternative form of my abrading tool,

Figure 6 is a longitudinal sectional view of a further alternative form of my abrading tool.

In the accompanying drawing, wherein like numerals are employed to designate like parts throughout the 65 same, the numeral 1 designates the abrading strip, which may consist of an elongated strip of abrading material, or other material, such as cloth used for buffing or polishing in the art.

Referring to Fig. 2, an essential part of my tool is the γθ spindle, designated by the numeral 2, and having a longitudinal slot 3. The spindle is co-axially extended at one end forming the drive-end 8, which serves to connect the spindle with the driving means, such as the chuck of a flexible shaft or of an electric motor. In the preferred form of my invention the drive-end 8 has the same diameter as the spindle 3.

The arrangement of the abrading strip is illustrated in Fig. 3, showing the end of the strip inserted into the slot 3 of the spindle 2, and the remainder of the strip 1 is rolled up or wound tightly around the spindle 2, forming a cylindrical roll. The direction of the winding of the strip 1 is preferably such as will be obtained when holding the free end of the strip 1 and rotating the spindle 2 in the same direction as during the abrading operation, which in case of Fig. 3 is counterclockwise.

Rotatably and axially slidably mounted over the driveend 8 is the socket 4, which has a cylindrical cavity 5, co-axial with the spindle 2. This cavity has a rounded edge and an internal thread, more clearly shown in Fig. 4. The diameter of this cavity 5 is such as to fit tightly over the end of the roll formed by the strip 1, giving a firm engagement between the thread of the cavity and the outer layer of the roll. This thread is helical and the direction of the thread is such as to advance the roll into the socket when the spindle is rotated in the same direction as during the abrading operation.

Fig. 4 shows an alternative form of the spindle 2 in which the slot 3 does not extend to the free end of the spindle 2. The object of this arrangement is to prevent the end of the strip 1, inserted into the slot, from sliding axially out of the slot. This axial anchoring of the roll is needed in some cases when the friction between the rolled up strip 1 and the spindle 2 is not sufficient to hold the roll in place.

Fig. 5 shows a more effective axial anchoring of the roll of the abrading strip 1 by means of a shoulder 6 which limits the sliding of the socket 4 toward the spindle 2. The shoulder is obtained by having the spindle 2 of larger diameter than the drive-end 8.

Fig. 6 offers an effective axial anchoring of the roll of abrading strip 1 in both directions, by means of the collar 7, disposed between the spindle 2 and the drive-end 8, and having a larger outer diameter than either of them.

Regarding the operation of my abrading tool the following characteristics are of importance:

The first one is the self-tightening feature of the clamping device employed to secure the abrading strip 1 to the spindle 2. This means, that if the abrading work is started with a loosely clamped strip, the normal rotation of the spindle will tend to wind the roll of abrading strip more tightly over the spindle, and also will tend to advance the roll into the threaded cavity of the socket 4, with the result that the clamping of the abrading strip will be automatically completed.

The second important feature is that, due to the absence of adhesives between the layers, the worn outer layer of the roll, not covered by the socket 4, can be easily removed exposing a clean new layer of abrading strip ready for work.

It is to be understood that the forms of my invention, herewith shown and described, are to be taken as examples of same, and various changes in the shape, size and in the arrangement of parts may be resorted to, without departing from the spirit of my invention, or the scope of the subjoined claims.