|Publication number||US3648418 A|
|Publication date||Mar 14, 1972|
|Filing date||Jul 15, 1970|
|Priority date||Jul 15, 1970|
|Publication number||US 3648418 A, US 3648418A, US-A-3648418, US3648418 A, US3648418A|
|Original Assignee||Churchich Ljudo|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (3), Referenced by (6), Classifications (5), Legal Events (2)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent Churchieh  HAND ABRADING TOOL  Inventor: Ljudo Churchich, 1777 Agate Street, St.
Paul, Minn. 55117  Filed: July 15, 1970 211 Appl. No.: 55,155
 11.8. C1 ..5l/392  Int. Cl ..B24d 15/04  Field of Search ..51/392, 393, 389, 390, 170 TL, 51/170 EB  References Cited UNITED STATES PATENTS Robbins ..5 1 392 4 14 Mar. 14, 1972 Stachelrodt... ..51/392 X Anderson ..51/392 X Primary Examiner-Donald G. Kelly Attorney-Burd, Braddock & Bartz [5 7] ABSTRACT A hand abrading tool comprising a handle and a flat flexible blade over which is stretched a tape or strip of abrasive cloth, paper, etc. Clamping means control the tension of the abrasive strip and of the spring steel blade. The blade may be flexed or bowed longitudinally so as to permit the abrasive strip to conform laterally to small channels and grooves and odd shapes.
9 Claims, 5 Drawing Figures PATENTEDMAR 14 I972 3,648, 11 8 INVENTOR LJUDO CHURCHICH ATTORNEYS HAND ABRADING TOOL This invention relates to a hand abrading unit for use by machinists, mechanics, tool and die men, cabinet makers, hobbyists, etc., for all manner of sanding and abrading tasks. The abrading unit is adapted to the use of flexible strips of abrasive tape for use on either flat or curved surfaces. The unit is characterized by a flexible blade which, depending upon the tension on the abrasive tape, may be bowed to provide a relatively firm but laterally deformable abrading surface capable of conforming to narrow grooves or irregular surfaces. The flexible blade also functions as a backing for the abrasive material in abrading relatively flat surfaces.
The tool according to the present invention provides increased versatility and ease of operation as compared with conventional sanding blocks, files and similar tools. It permits the abrasive surface to conform to virtually any contour to be abraded, whether flat, concave, convex, etc.
The invention is illustrated by the accompanying drawings in which the same numerals identify corresponding parts and in which:
FIG. 1 is a top plan view of the abrading tool;
FIG. 2 is a side elevation of the tool;
FIG. 3 is a similar side elevation shown with the supporting blade flexed;
FIG. 4 is a transverse section on the line 4-4 of FIG. 3 and in the direction of the arrows; and
FIG. 5 is a transverse section generally along the line 5-5 of FIG. 4 but showing the abrasive material flexed laterally.
Referring now to the drawings, the sanding tool according to the present invention, indicated generally at 10, comprises a handle 11 of any size or shape adapted for easy grasping by the hand and a flat elongated flexible blade 12 rigidly secured to the handle by any suitable means such as rivets or the like. Blade 12 may desirably be inset in the generally flat base of the handle. The free flat end of the blade is bowed slightly at 13 to form a lip of small radius over which the abrasive material may be passed without being cut or torn.
Blade 12 is flexible, desirably being formed from 0.015- to 0.025-inch spring steel. The blade is desirably about four to seven inches long for most purposes. For general purpose use it is desirably about three-four inch wide, adapted to be used with l-inch abrasive tape, although for other and more specialized purposes it may be either narrower or wider. In all instances the blade is desirably about one-eighth to three-eighth inch narrower than the abrasive tape with which it is adapted to be used. The blade should desirably also be about five-sixteenth to three-eighth inch narrower than the width of the base of the handle at its point ofattachment.
A strip of flexible abrasive material, indicated generally at 14, extends from the handle in a top course 15 along the top of blade 12 in engagement therewith, around bowed tip 13 of the blade and back in a lower course 16 spaced from blade 12 to the handle 11. The abrasive strip 15 is held in place by a clamping mechanism comprising a tubular sleeve 17 of generally rectangular cross section secured, as by means of pins 18, to the base of handle 11. The inside dimensions of tubular sleeve 17 are such that side walls thereof closely engage the sides ofthe base of handle 11 and the top and bottom walls are spaced from the base of the handle a sufficient distance, such as about one-thirtysecond to one-sixteenth inch, to permit the easy insertion of a strip of abrasive material in the slotlike passages between the inside of the sleeve and the base of the handle.
A pair of knurled knob screws 19 and 20 engage threaded apertures centrally disposed in the top and bottom surfaces, respectively, of the sleeve 17. The abrasive strip is held securely by means of these screws. For maximum gripping to maintain the flexible blade in flexed or bowed condition (as seen in FIG. 3) the base of the handle 11 is countersunk slightly at 21 underlying the end of screw 20. The inside dimensions of sleeve 17 are such as to provide easy clearance for the edges of the abrasive strip material. Desirably this is at least l-3/32 inch forl-inch abrasive tape.
The abrasive strip material may be commercial abrasive tape, abrasive cloth cut into strips, strips, abrasive paper cut into strips, abrasive mesh and screening, etc., so-called sandpaper, emery cloth, and the like. A strip of the abrasive material of suitable length is cut and its ends are passed through the spaces on opposite sides of the handle between sleeve 17 and the base of the handle, pulled taut, and secured by tightening screws 19 and 20. For flat work and large radius concave and convex surfaces, the blade may be lefi in its flat unflexed condition as seen in FIGS. 1 and 2.
Because the blade 12 is of lesser width than the abrasive material 14, the edges of the abrasive material overlap the blade, as best seen in FIG. 5. This prevents accidental scraping of the work by the edges of the blade. It also permits abrading of fine grooves and channels and the like by using the blade edge with the edge of the abrasive tape folded around it as the working portion of the tool.
When it is desired to abrade a surface, such as groove 22 in work piece 23 as seen in FIG. 5, then the blade 12 is flexed as seen in FIG. 3 by loosening screw 20, pulling the lower course 16 of abrasive tape through the clamping mechanism until blade 12 is bowed as desired, and then clamping in place by retightening screw 20. As seen in FIG. 5, this permits lateral flexing of the lower course 16 of the abrasive tape so as to conform to a surface such as groove 22. In the same manner, the abrasive tape may be flexed in the opposite direction to conform to a convex or The flexible abrasive tool is useful for deburring and sanding in hard-to-reach areas and on diffiicultto-handle pieces. It may be used to abrade small flat areas or nonplanar surfaces. The tension of the abrasive tape may be adjusted as desired. The tool is of simple rugged construction designed to insure a long and useful life. The abrasive tape may be easily inserted, replaced and exchanged for other abrasive tapes of different fineness or coarseness.
It is apparent that many modifications and variations of this invention as hereinbefore set forth maybe made without departing from the spirit and scope thereof. The specific embodiments described are given by way of example only and the invention is limited only by the terms of the appended claims.
The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
1. A hand abrading tool comprising:
A. a handle,
B. a flat-ended flexible elongated blade fixedly secured to said handle,
C. a strip of flat flexible abrasive material having two ends extending from one side of said handle around the end of said blade back to the opposite side of the handle, said abrasive material engaging said blade in surface contact therewith on no more than one side thereof, and
D. independent fastening means for securing one end of the abrasive material to one side of said handle and independently securing the other end of the abrasive material under tension to the opposite side of said handle, whereby said flexible blade may be bowed and retained in bowed position.
2. A hand abrading tool according to claim I further characterized in that the base of said handle is relatively flat and said blade is secured to one flat surface thereof in longitudinal alignment therewith.
3. A hand abrading tool according to claim 2 further characterized in that said means for securing the abrasive material to said handle comprises:
A. a relatively flat slot on each of the opposite sides of the handle base for receiving the respective ends of said strip of flexible abrasive material,
B. said slots being in longitudinal alignment with said flexible blade,
C. clamping means for securing said abrasive material in said slots.
4. A hand abrading tool comprising:
A. a handle,
B. a flat-ended flexible elongated blade secured to said handle, the base of said handle being relatively flat and said blade being secured to one flat surface thereof in longitudinal alignment therewith,
C. a strip of flexible abrasive material extending from one 5 side of said handle around the end of said blade back to the opposite side of the handle, and
D. means for securing the abrasive material to said handle,
said means comprising:
1. a hollow tubular sleeve of generally rectangular cross section disposed around and secured to the base of said handle,
2. said sleeve being in engagement with the edges of said handle base and secured thereto and spaced from the opposite flat surfaces of the handle base to form flat slots therebetween for receiving the respective ends of said strip of flexible abrasive material,
3. said slots being in longitudinal alignment with said flexible blade, and
4. screw means centrally disposed in opposite sides of said O tubular sleeve overlying said slots for clamping said abrasive material in the slots.
5. A hand abrading tool according to claim 4 further characterized in that the surface of said handle base opposite from the flat surface to which said flexible blade is secured is countersunk underlying said screw means.
6. A hand abrading tool according to claim 4 further characterized in that said blade is about one-eighth to threeeighth inch narrower than said strip of flexible adhesive material.
7. A hand abrading tool according to claim 4 further characterized in that the free flat end of said flexible blade is provided with a small radius arcuate lip.
8. A hand abrading tool according to claim 4 further characterized in that said flexible blade is composed of about 0.015- to 0.025-inch spring steel.
9. A hand abrading tool according to claim 4 further characterized in that said abrasive material is abrasive coated cloth tape.
zg g g UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION patent 3 ,648 ,418 D d March 14 1972 Inventor) Ljudo Churchich It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shownvbelo'w:
Column 2, line 27, after "or", --other nonplanar surface-- should be inserted.
Signed and sealed this 15th day of August 1972.'
EDWARD N. FLETCHER,J'R. ROBERT GOTTSCHALK Attesting Officer Commissioner of Patents
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US1169061 *||Apr 3, 1912||Jan 18, 1916||Ernst G K Anderson||Abrading device.|
|US2189302 *||Jun 8, 1939||Feb 6, 1940||Western Electric Co||Abrading tool|
|US2547837 *||Aug 27, 1949||Apr 3, 1951||Elmer Robbins||Abrading tool|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US3699729 *||May 14, 1971||Oct 24, 1972||Carrier Craft Corp||Sanding hand tool|
|US4361990 *||Nov 28, 1980||Dec 7, 1982||Linkspiel, Inc.||Sandpaper holder|
|US5993306 *||Mar 4, 1998||Nov 30, 1999||Pro-Line, Inc.||Sanding and cleaning device for drywall bullnose cornerbeads|
|US6439983||Nov 17, 2000||Aug 27, 2002||Pro-Line, Inc.||Sanding and cleaning device for drywall bullnose cornerbeads|
|US6729949||Jun 7, 2002||May 4, 2004||Pro-Line, Inc.||Sanding and cleaning device for drywall bullnose cornerbeads|
|US8182317||Oct 24, 2008||May 22, 2012||Harold Ano||Handheld sanding implement|
|International Classification||B24D15/00, B24D15/02|
|Feb 28, 1983||AS02||Assignment of assignor's interest|
Owner name: CHRUCHICH, LJUDO TRUSTEE IN THE VOLUNTARY DISSOLUT
Owner name: CHURCHICH, LJUDO, INDIVIDUALLY
Effective date: 19830222
|Feb 28, 1983||AS||Assignment|
Owner name: CHURCHICH, LJUDO, INDIVIDUALLY
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CHRUCHICH, LJUDO TRUSTEE IN THE VOLUNTARY DISSOLUTION OFNICOL TOOLS, INC.;REEL/FRAME:004101/0298
Effective date: 19830222