US2645064A - Abrading tool - Google Patents

Description

J. PAvLovlc ABRADING TOOL Jul 14, 1953 Filed March 28, 1952 F/Gf Z Patented July 14, 1953 UNITED STATES PATENT- QFFICE V ABRADING TOOL U Joseph Pavlovic, Minneapolis, Minn.

' I Application March 28, 1952, SerialNo. 279,016

This invention relates to abrading tools. More particularly, it relates to abrading tools of the type wherein an abrasive sheet is removably at-.

tached to a supporting surface, of the tool to facilitate the abrading operation.

This invention is an improvement on the abradingtool disclosed and claimed in my prior patent, No. 2,415,367, entitled Abrading Tools, and issued to me February 4, 1947. Although the abrading tool disclosed and claimed in my prior patent has proved highly satisfactory, I have since conceived of a structure which constitutes a still further improvementv in such a tool.

It is a general object of my invention to provide a novel and improved abrading tool.

A more specific object is to provide a novel and improved abrading tool which will function in an improved manner and can nevertheless be manufactured of cheap and simple construction.

A still more specific object is to provide an abrading tool constructed to facilitate the quick and easy attachment and detachment of an abrasive sheet thereto with increased security Without weakening the structure of the sheet itself.

Another object is to provide an abrading tool having means for effectively retaining a stack of abrasive sheets in such a way that they can be easily applied to the tool and can quickly and easily be removed in sections as the outer sheets are worn away by use.

Still another object of the invention. is to provide an extremely simply constructed tool body with means for effectively securing a stack of specia'lly formed sheets. thereto wherein all of the sheets are simultaneously held under tension durf ing, the abrading operation and wherein a clamping action is utilized tojfacilitate the-quick and easy removal of a single'sheet or a plurality of such sheets.

These and other objects and advantages of my invention will more fully appear from the following description made in connection with the accompanying drawings, wherein like reference character's refer to the same or similar parts throughout the several views, and in which:

Fig. 1 is a side elevational view of one embodiment of my invention with portions thereof broken away adjacent the abrasive sheet securing means;

"Fig; 2 isa front elevational view of the'same; and

Fig. 3 is a perspective view of one form of clamp which may be used-in my invention. r One embodiment of my invention may include, as shown in Figs. i=3, an elongated sheet holding 11 Claims. (01. 51-187) body -5' which preferably is tapered toward its upper or outer end 6 and whose outer end edge is rounded as at I as shown in Fig. 1. A handle 8 forms a part of and extends from one end of the body 5. Where the body .5 and the handle 8 join I provide a reduced portion 9 formed by arcuate cut-outs II] to provide finger and thumb receiving seats. 1 I

The body 5 adjacent the point where it joins the handle 8 has a longitudinally extending aperture II therethrough. A rod IZextends longitudinally through thehandle 8. The outer end of the rod I2 is provided with a knurled head I3 and the inner end of this rod is threaded as at [4 and extends through a clamp member indicated generally as I5 having a threaded aperture therein.

This clamp member I5 has a pair of clamping arms I6 extending from opposite sides thereof, first outwardly of the aperture II, and then inwardly beyond opposite sides of the supporting body 5. Each of the arms has a clamping portion I! which abuts against the sides of the body I 5 and each arm is formed of a resilient material such as spring metal so as to constantly urge the clamping portions II inwardly toward each other. Formed in the opposite sides of the body 5 and opposite each other is a pair of transversely extending recesses I8. These recesses I8 are disposed adjacent to the aperture II and between that aperture and the rounded end I of the body 5. The clamping arms I6 are of, suflicient length so that their clamping'portions I'I'may extend into the recesses I8 when the clamp member is moved toward the rounded end I of the body 5.

:In. other words, the length of the clamping arms I6 is at leastequal to the distance between the recesses I8 and the side wall "of the aperture closest to these recesses.

The two clamping arms I6 are connected at their inner end portions I9 by a connecting portion 20 to form the clamp member I5. This connecting portion 20 has an aperture 2| formed therein and the walls of the'conne-cting portion 'Which define the-aperture are internally threaded so as to cooperate with the threads I4 at-the' rod I 2 to cause the clamp member I5 to move toward and'away from the rounded end I of the body 5 when the rod I2 is turned by means of the knob I3.

The clamp member I5 is so formed that the spacing between the clamping portion 11 of the respective arms I6 issubstantially equal to the thickness of the body 5 between the two opposite recesses or grooves I8. l have found that it is preferable to-have the spacing between these clamping portions II slightly greater than the thickness of the body 5 in this area so as to facilitate the ready and quick insertion or removal of a number of abrasive sheets 22 therebetween.

In use, a plurality of abrasive sheets are placed in a stack and are bent around the end I to lie along opposite sides of the body 5 as shown in Fig. l. The knob I3 is turned so as to cause the clamp member I5 to move toward the rounded end I until the clamping portions II of the arm I6 slide into the recesses I8. The ends of the sheets 22 are then slid laterally between the portions of the body 5 Which define the recesses I8 and the clamping portions ll of the clamping arms. When the knob I3 is turned so as to draw the clamping member I5 toward the handle 8, the clamping portion I! must necessarily ride outwardly from the recesses I8 and clamp the end portions of the abrasive sheets firmly against the thicker portions of the body 5 adjacent these recesses to secure the sheets in a firm and positive manner. Due to the fact that the tension upon the clamping member is imposed at the connection portion 20, which is the base of the clamping member I5, this pulling action tends to cause the clampingportion II to clamp the abrasive sheets 22 even more tightly than would normally be the case if the clamping member were merely pushed toward the handle by some other means. In other words, an improved clamping action is attained through the use of thethreaded rod I2 at the base of the clampingmember. I have found that this structure secures the abrading sheets in an improved manner and eliminates any possibility of rendering the sheet unsatisfactory for. use as maybe the case when the sheets are apertured and-.drawntoo tightly over the end of .the main body 5.:by providing members extending outwardly therethrough.

:Itshould be. noted that my improved abrading too-l precludes anyweakening of the abrasive sheet structure itselfso that there is no danger whatsoevercf wasting any. ofthe abrading sheets. In addition, I have attained an improved securing action since theclamping action is applied across substantiallylthe entire width of. the abrasive sheet. v..:,

By. employing the two opposite recesses I8 I have greatly facilitated the. mounting of a stack of abrasive sheetsupon such a tool. I find that a stack of sheets .canbe applied more quickly to such a tooland with a minimum of inconvenience. It is notimperative that each sheet in the, stack be truly aligned with the other when my improved 'abradingtooljs. used. Whenthe outer sheet has become worn the knob I3 is merely loosenedand then pushed inwardly toward the handle whereupon the clamping portion II will againslip into the recesses. I8 and the outer-most sheet can be quickly slid therefrom. A few turns of the knob I3 again draw the clamping portions outwardly in clampingposition against the sides of the main body 5.

It should be noted that the clamping member i5 is a relatively simple article to manufacture since it can be stamped from a single piece of material and oamtherefore be manufactured at a reduced cost.'

It will, of course, be understoodthat various changes may be made in the form, details, ar-

rangements an d;.-proportions of the various parts without departingfrom the scope of my invention. V

What is claimed-is:

l 1. In an abrading tool, an elongated body having a. continuous sheet supporting surface extending along the opposite sides and about an end of said body, a pair of abrasive sheet engaging members projecting outwardly from opposite sides of said body and then inwardly toward said end of said body and adapted to engage portions of an abrasive sheet adjacent opposite ends thereof with said inwardly extending portions of said members when the sheet is placed about said end and along oppcsite'sides of the body, and means for moving at least one of said sheet engaging members toward and away from an end of said body.

2. In an abrading tool, an elongated body having a continuous sheet supporting surface extending along opposite sides and about an end of the body, a pair of clamp elements projecting outwardly from opposite sides of said body toward said end of said body and adapted to clamp portions of an abrasive sheet adjacent opposite ends thereof against the sides of said body when the sheet is placed about said end and along opposite sides of said body, and means for moving at least one of said clamp elements toward and away from an end of said body.

3. In an abrading tool, a body having a handle thereon and having an aperture therethrough adjacent the base of said handle, an abrasive sheet clamping member located in said aperture and having portions extending transversely outwardly therefrom at opposite sides of said body toward said end of said bodyand engaging the opposite sides of said body in clamping relation, and means for moving at least one of said outwardly extending portions ofsaid clamp member toward and away from said end of said body.

i. In an abrading tool, a body having a handle thereon and having an aperture therethrough adjacent the base of said handle, a clamp member located in said aperture and having medial portions extending transversely outwardly therefrom at opposite sides of said body and having end portions engaging opposite sides of said body to clamp a portion of an abrasive sheet against said body adjacent said aperture, and a rotary threaded element extending through said handle and threaded into said abrasive sheet clamping memher and adapted to shift said member in said aperture longitudinally of said body.

5. In an abrading tool, a body having a continuous sheet supporting surface extending along opposite sides and about an end of the body, and having ,a transversely extending recess formed in one of its'sides, means for securing one end portion of'an abrasive sheet against one side of said body, a clamp element movable longitudinally of said body and extending outwardly from the other side of said body and adapted to clamp an end portion of such sheet against the opposite side of said'body adjacent its recess when such sheet is placed about said'end and along opposite sides of said body and across said recess, said clam element extending outwardly on the same side of said body as said recess and having an end portion resiliently engaging said same side of said body to accomplish said clamping action, and means for moving said clamp element toward and away from said recess.

6. In an abrading tool, a body having a c 3111110135 Sheet pp t g surface extending along opposite sides and about anend of the body, said y having a spaced pair of opposite transverse recesses formed in the' opposite sides of said b y. a pair. of clarnp elements projecting outwardly from opposite sides of said body and toward said recesses and having end portions resiliently bearing against opposite sides of said body adjacent said recesses to positively engage an abrasive sheet adjacent opposite ends thereof when the sheet is placed about said end and along opposite sides of the body and across said recesses, and means for moving said clamp elements into and out of said recesses and toward and away an end of said body.

7. In an abrading tool, a body having a continuous sheet supporting surface extending along opposite sides and about an end of the body, a pair of resilient clamp elements projecting outwardly from opposite sides of said body and having portions resiliently bearing against said opposite sides of said body to clamp portions of an abrasive sheet adjacent opposite ends thereof against the sides of said body when the sheet is placed about said end and along opposite sides of said body, said clamp elements being con-, nected together by their inner end portions, and means for threadedly mounting said clamp elements by their connecting portions upon said body for movement longitudinally of said body toward and away from an end of said body.

8. In an abrading tool, a body having a continuous sheet supporting surface extending along opposite sides and about an end of the body, and having a spaced pair of opposite transversely extending recesses formed in the opposite sides thereof, a pair of abrasive sheet clamping arms projecting outwardly and then inwardly from opposite sides of said body and having free end portions resiliently engaging opposite sides of said body to clampingly engage portions of such a sheet adjacent opposite ends thereof when the sheet is placed about said end and along opposite sides of said body and across said recesses, the spacing between the outer ends of said arms being no greater than the thickness of said body between said recesses, and means for moving said end portions of said arms toward said end of said body into said recesses and away from said end of said body out of said recesses.

9. In an abrading tool, a body having a continuous sheet supporting surface extending along opposite sides and about an end of the body, a clamp member mounted on said body for longitudinal movement thereof, said clamp member including a pair of clamp elements projecting outwardly from opposite sides of said body and having free end portions resiliently engaging opposite sides of said body at all times to clamp portions of an abrasive sheet adjacent opposite ends thereof against the opposite sides of said body when the sheet is placed about said end and along the opposite sides of said body, and mechanism for moving said clamp member toward and away from an end of said body.

10. In an abrading tool, a'body having a handle thereon and having an aperture therethrough adjacent the base of said handle, said body having a continuous sheet supporting surface extending along opposite sides and about an end of the body and having a pair of opposite transverse recesses formed in the opposite'sides thereof adjacent said aperture, a clamp member located in said aperture and having a pair of clamp elements extending transversely outwardly therefrom at opposite sides of said body and toward said recesses, the length of said clamp elements being greater than the distance between said aperture and said recesses, and means for moving said clamp member longitudinally of said body into and out of said recesses.

11. In an a'brading tool, a body having a continuous sheet supporting surface extending along opposite sides and about an end of the body, and having a spaced pair of opposite transverse recesses formed in the opposite sides of said sheet supporting surface and being separated from each other by a portion of said body, an abrasive.

sheet clamping member movably mounted on said body adjacent said recesses and having a pair of resilient clamp elements projecting outwardly from opposite sides of said body toward said recesses and then inwardly again to clamp an abrasive sheet adjacent opposite ends thereof against opposite sides of said body when such sheet is placed about said end and along opposite sides of said body and across said recess, the spacing between the clamping portions of said resilient clamp elements under non-clamping conditions being substantially the same as the thickness of said body between said recesses, and means for moving said clamp member longitudinally of said body into and out of said recesses. JOSEPH PAVLOVIC.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,893,679 Quinn u Jan. 10, 1933 2,076,973 Wilson Apr. 13, 1937 2,189,307 Bierma Feb. 6, 1940 2,324,918 Engle July 20, 1943 2,415,367 Pavlovic Feb. 4, 1947 2,464,668 Booth Mar. 15, 1949 2,481,399 Gunnarson Sept. 6, 1949

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