US3045992A

US3045992A - Abrading machine and drive therefor

Info

Publication number: US3045992A
Application number: US756324A
Authority: US
Inventors: Charles T Asbury
Original assignee: Individual
Current assignee: Individual
Priority date: 1958-08-21
Filing date: 1958-08-21
Publication date: 1962-07-24
Anticipated expiration: 1979-07-24

Description

July 24, 1962 c. 'r. ASBURY ABRADING MACHINE AND DRIVE THEREFOR 2 Sheets-Sheet 1 Filed Aug. 21, 1958 'INVENTOR. Z 4550?! 'ATTOPA/[FJ July 24, 1962 c. T. ASBURY ABRADING MACHINE AND DRIVE THEREFOR 2 Sheets-Sheet 2 Filed Aug. 21, 1958 RV. mw 2 WNW r m J M m M (w United States Patent 3,645,992 ABRADING MACHINE AND DRIVE THEREFOR Charles T. Asbury, 717 Isle of Palms, Fort Lauderdale, Fla. Filed Aug. 21, 1958, Ser. No. 756,324 3 Ciaims. ((31. 262-20) This invention relates to cutting and abrading devices including the cutting elements associated with the devices and the mechanism by which the cutting elements are supported and driven to carry out a cutting or abrading operation.

In my issued Patents Nos. 2,740,980 issued April 10, 1956, for: Apparatus for Cutting and Abrading; 2,756,659 issued August 7, 1956, for: Device for Cutting Stone and Concrete; and 2,763,257 issued Septem ber 18, 1956, for Apparatus for Cutting Stone and my pending patent applications Serial Nos. 537,922 filed October 3, 1955, now Patent No. 2,85 1,028, issued September 9, 1958, for Loop Tension Cutter; 584,673 filed May 14, 1956, now abandoned for Method and Apparatus for Treating Surfaces; 625,791, filed December 3, 1956, now Patent No. 2,850,862, issued September 9, 1958, for Cutting Devices; 682,682, filed September 9, 1957, now abandoned, for Cutter Elements; and 721,- 741 filed March 17, 1958, for: Cutting Tool, there are disclosed various types of cutting elements and holders for the cutting elements and mechanisms for supporting and rotating the holders so that the cutting elements will carry out a cutting or abrading operation.

The present invention represents a further advance and improvement in this art over what is shown in the patents and applications referred to above.

In particular the present invention represents an advance with respect to the mounting of the cutting elements on the holder, in the construction of the holder, and in the construction of the frame on which the holder is mounted and the drive to the holder.

It is a particular object of this invention to provide a holder of inexpensive but extremely strong construction and one in connection with which the cutting elements are supported so as to carry out a cutting or abrading operation with the highest degree of efficiency.

Another object of this invention is the provision of a novel reversing drive arrangement for the holder so that the cutting elements can be caused to traverse a surface being operated in either direction whereby greater emciency of operation is had because a sharp cutting edge can always be presented to the work.

These and other objects and advantages will become more apparent upon reference to the drawings in which:

FIGURE 1 is a more or less diagrammatic perspective view showing a cutting or abrading apparatus according to the present invention;

FIGURE 2 is a vertical transverse section taken along the cutter holder shaft and is indicated by line 22 on FIGURE 1;

FIGURE 3 is a fragmentary vertical section indicated by line 3-3 on FIGURE 1 and showing the back end of the platform of the mechanism and the connection there to of the platform tilting screw;

FIGURE 4 is a fragmentary vertical section indicated by line 4--4 on FIGURE 1 showing a pivotal connection between the wheel supporting frame of the apparatus and the tilta'ble cutter holder supporting platform;

FIGURE 5 is a fragmentary vertical sectional view indicated by line 5-5 on FIGURE 2 showing the cutting holder in cross-section;

FIGURE 6 is a fragmentary vertical section indicated by line 6-6 on FIGURE 2 showing the cutter held in end elevation;

3,645,992 Patented July 24, 1962 FIGURE 7 is a plan view of the apparatus showing the arrangement of the parts thereof;

FIGURE 8 is a sectional view through a modified form of cutter holder; and

FIGURE 9 is a fragmentary sectional view showing a cutter holder according to FIGURE 8 mounted in the abrading apparatus.

Referring to the drawings somewhat more in detail, in FIGURE 1 there is shown the complete apparatus which includes a frame generally indicated. at It to which is attached supporting wheels 12. Carrie-d in the frame is a platform 14 and toward the front of the apparatus frame 14 comprises the spaced forwardly extending angles 16 on which angles are supported bearings 18 and in which bearings there is journalled holder 20 that carries a plurality of cutting elements 22 which are distributed axially of the holder and circumferential.

At one end of the holder the supporting shaft therefor, 24, extends through its pertaining bearing 18 and supports a pulley 26 over which the V-belts 28 pass. V-belts 28 extend backwardly and pass around the output pulley of a reversible transmission 30 that has at its other end an input pulley 32 driven by V-belts 34 which in turn pass around and are driven by pulleys 36 on the output shaft of an internal combustion motor 38.

Transmission 30 is characterized in being reversible and this is accomplished by operation of shift lever 40. Because of the reversibility of transmission 30, the cutter holder can be driven in either direction and in this manner when the cutting elements become slightly dull on one side the transmission can be operated to reverse the direction of rotation of the holder thus bringing the sharp edges of the cutting elements into engagement with the work.

The platform 14 is carried on frame 10 on a transverse shaft 42 which is shown in FIGURE 4 so that the platform is tiltable in the frame thereby to adjust the elevation of the holder from the work so that the cutting elements can be precisely positioned and so that wear of the cutting elements can be compensated for.

The tilting of the platform is accomplished by a screw 44 shown in FIGURES 1 and 3 which has its lower end journalled in a trunnion 46 pivoted between the upstanding ears 48 at the back edge of platform 14 and with the upper end of the screw being threaded through the trunnion mounted nut 50 carried between ears .52 that extend forwardly from top bar 53 of a handle structure that includes the side members 56 that are mounted in sockets 58 attached to the side rails of frame member 10.

Hand wheel 54 on the upper end of screw 44 provides means whereby the operator can readily adjust the platform position.

One work operation for which the device of the present invention is particularly well adapted is that of abrading paint lines from highway surfaces.

In FIGURE 1 the highway surface 57 has a paint line 58 thereon and by adjusting the apparatus properly the paint line can rapidly be abraded from the highway without in any Way damaging the highway surface and without cutting a groove in the highway surface.

The cutting elements 22 are more fully disclosed and described in my copending application Serial No. 721,741 referred to above and each consists of a length of twisted wire, for example, two Wires twisted together, with each wire being, say to 4;". These twisted wires are bent to a U-shape and there is a metal bearing member clamped to the U-shaped twisted wire cutting element at the closed end thereof thus holding the legs of the cutting element in supporting relation relative to each other and providing an accurate bearing for supporting the cutting elements.

The holder of the present invention comprises spaced end plates 60 mounted on shaft 24 and these plates if aoaaaea desired may be welded to the shaft. The plates are provided with transversely aligned circumferentially spaced apertures and into these apertures extend the cutter element supporting rods 62. The end plates 60 have mounted thereon the rings 64 which cover the aforementioned apertures and hold the rods 62 in assembled relation with the end plates and at least one of the rings 64 is detachably mounted on its pertaining end plate as by cap screws 66 so that the ring can be removed thus permitting the rods to be slipped out of the end plates endwise and the cutter elements replaced when necessary.

The entire holder structure may be reinforced and supported by a sleeve 68 extending between end plates 60, this sleeve preferably being welded to the end plates and being located close to the inner ends of the cutting elements whereby to support the cutting elements against inwardly movement greater than a predetermined amount should the rods 62. or the bearing apertures in the cutting elements become worn. Sleeve 68 thus strengthens and reinforces the holder and at the same time provides inner stop means preventing inward radial movement of the cutter elements and whereby the accuracy of the abrading or cutting operation is maintained.

A feature of the present invention is illustrated in FIG- URE wherein it will be noted that the cutting elements 22 are closely adjacent one another due to the close spacing between the cutter element support rods 62. This close spacing of the cutting elements tends to limit their swinging movement when deflected under load thus reducing the Wear on the cutting element bearings and providing for the application of greater working pressure to the work than is possible when the cutter elements are widely spaced apart and are thus more free to swing through a wide arc.

In addition, the close spacing of the cutting elements as shown in FIGURE 5 provides for more abrasions of the work per revolution of the cutter and this increases the speed of the cutting or abrading action.

Also, the close arrangement of the cutting elements tends to make the load on the holder and drive train and drive motor more uniform so that there is less likelihood of the apparatus jamming under load or being noisy in operation.

It is also contemplated within the scope of the present invention to form the cutter holder without sleeve 68 but to obtain the advantage of the enlarged central memher by making the holder as illustrated in FIGURES 8 and 9. In these views supporting shaft 70 of the holder has an enlarged center part 72 and attached to its opposite ends of enlarged parts 72 as by welding are the annular end plates 74 corresponding to end plates 60 of the first modification.

The annular plates 70 are smaller in diameter than plates 60 and carry the cutter elements support rods 76 in the same manner as the rods 60 are supported in plates 60.

Cutter elements 78 are mounted on the rods and .this provides for a complete cutting and abrading mechanism. The rods 76 can be spaced close together as are the rods 62 in FIGURE 5 but since the holder of FIG- URES 8 and 9 is smaller in diameter than the first described modification, the rods are fewer in number. No particular size limitations are intended however and the modification of FIGURES 8 and 9 could be made to the same sizes as the first described modification although being better adapted for the smaller size on account of the solid center shafting.

Inasmuch as the apparatus of my invention is adapted for use on highways, it is proposed to maintain a flashing light 80 supported on the handle and which flashing light 80 is supplied by a battery 82 maintained charged by a generator 84 driven by one of the V-belts. This is an important safety feature that adds to the utility of the mechanism.

It will be understood that this invention is susceptible to modification in order to adapt it to different usages and conditions; and, accordingly, it is desired to comprehend such modifications within this invention as may fall within the scope of the appended claims.

I claim: 1. In an holder for abrading apparatus of the nature described, a swingably supporting cutting elements and comprising a central shaft, means for reversibly driving said shaft, U-shaped cutting elements having apertures formed in their closed ends, a pair of spaced end plates on the shaft, circumferentially spaced transversely aligned apertures in said end plates, rods extending from one end plate to the other and having their ends in said apertures for swingably supporting said cutting elements by engaging the said apertures therein, ring means attached to said end plates on the outside thereof overlapping the apertures therein to prevent the rods from becoming disassembled from the holder and at least one ring being detachable, and cylindrical means coaxial with said shaft extending from one end plate to the other radially inwardly of said rods supporting the end plates relative to each other and providing stop means preventing inward movement of the cutting elements mounted on the rods, said cylindrical means comprising a rigid sleeve concentric with the shaft and extending between and attached to said end plates, said rods being closely spaced so that the cutter elements on each rod are limited in swinging movement by abutment with the cutter elements on adjacent rods to a total swinging movement of less than 2. In an abrading apparatus of the nature described, U-shaped cutting elements having holes in their closed ends, a holder for swingably supporting said cutting elements and comprising a central shaft, means for reversibly driving said shaft, a pair of spaced end plates on the shaft, circumferentially spaced transversely aligned apertures in said end plates, rods extending from one end plate to the other and having their ends in said apertures extending through the holes in the cutting elements swingably supporting said cutting elements, ring means attached to said end plates on the outside thereof overlapping the apertures to prevent the rods from becoming disassembled from the holder and at least one ring being detachable, and cylindrical means coaxial with said shaft extending from one end plate to the other radially inwardly of said rods supporting the end plates relative to each other and providing stop means preventing inward movement of the cutting elements mounted on the rods, said cylindrical means comprising an enlarged rigid portion on the shaft extending from one end plate to the other, said rods being closely spaced so that the cutter elements on each rod are limited in swinging movement by abutment with the cutter elements on adjacent rods to a total swinging movement of not more than 90.

3. In an abrading apparatus of the nature described, U-shaped cutting elements having holes in their closed ends, a holder for swingably supporting said cutting elements and comprising a central shaft, means for reversibly driving said shaft, a pair of spaced end plates on the shaft, circumferentially spaced transversely aligned apertures in said end plates, rods extending from one end plate to the other and having their ends in said apertures extending through the holes in the cutting elements and swingably supporting said cutting elements, ring means attached to said end plates on the outside thereof overlapping the apertures to prevent the rods from becoming disassembled from the holder and at least one ring being detachable, and rigid cylindrical means coaxial with said shaft extending from one end plate to the other radially inwardly of said rods supporting the end plates relative to each other and providing stop means preventing inward movement of the cutting elements mounted on the rods, and the spacing between said rods being such that each row of cutting elements forms stop means limiting the deflecting movement of the adjacent row of cutting elements to a total swinging angle of about 20.

(References on following page) UNITED STATES PATENTS Brunelle Sept. 18, 1883 Warner Dec. 27, 1910 Radlein Aug. 18, 19 14 5 Devoorde Sept. 14, 915 Peterson Apr. 28, 1925 Price Jan. 18, 1927 6 Mudge Dec. 4, 1928 Emrnons May 5, 1931 Wittick Sept. 6, 1932 Gerharot Aug. 14, 1934 Luksch et a1 Dec. 29, 1953 FOREIGN PATENTS France Apr. 20, 1914 Germany Nov. 13, 1931