US2430099A

US2430099A - Abrasive head

Info

Publication number: US2430099A
Application number: US602749A
Authority: US
Inventors: Ernest H Bradley
Original assignee: VONNEGUT MOULDER CORP
Current assignee: VONNEGUT MOULDER Corp
Priority date: 1945-07-02
Filing date: 1945-07-02
Publication date: 1947-11-04
Anticipated expiration: 1964-11-04

Description

Nov, 4, 1947. E. H. BRADLEY 2,430,099

ABRASIVE HEAD Filed July 2, 1945 ABRASIVE HEAD v Filed July 2, 1945 2 Sheets-Sheet 2 INVENTOR. fK/VA-SI' Bmw 11 Patented Nov. 4,1947

- i Ernest 11. Bradley, Indianapolis, Ind., assignor to Vonnegut Moulder Corporation, Indianapolis,

Ind., a corporation Application Ju y 2, 1945, Serial No. 602,749 12 Claims. (01. 51-194) This invention relates to an abrasive head of the type that may be employed in smoothing products of wood and other materials, including mouldings, carvings, die castings and the like,

having irregular surfaces, and particularly a spindle sander of the character disclosed in Letters Patent to Plengemeier No. 2,125,460, granted August 2, 1938. The invention further pertains to that part of the abrasive head comprising the anchorage for the abrasive strips.

In abrasive heads of this character it may be desirable to employ a relatively large number 01' brushes which are closely spaced and between each of which an abrasive strip extends, as com! pared with the sander shown in the above patent.

To develop such an abrasive head, two problems had to be overcome; namely, the brush holders so constructed and related\ as to permit the greatest number of brushes to be removably mounted in the head in as closely spaced relation as possible, and without materially increasing the cost and weight. This is accomplished by a simplified structure herein disclosed wherein the brush holders comprise a series of U-shaped Fig.3 is a front elevation or the head assembled for use with the cover plate removed.

Fig. 4 is a perspective view of the anchor loop structure showing in dotted lines a portion or the abrasive strip as secured thereto.

Fig. 5 is a central vertical section through the head with parts removed.

In the drawings there is illustrated an abrasive or polishing unit having a supporting base l0 upon which there is mounted an electric motor i l driven from any suitable source of current, not illustrated. Extending from the motor there is a bearing housing i2, and such housing may extend from both sides of the motor to provide dual abrasive units. v Driven by the motor and supported by the bearing housing there is a spindle l3 for supporting and rapidly rotating the abrasive head.

.The abrasive head comprises an annular back plate It about the periphery of which there is an annular series of outwardly extending bru h holders I5 slightly spaced from each other and secured perpendicularly to the back plate. Said holders are rigidly and permanently secured to the back plate and are U-shaped in cross section or in the form of channels which may be die cast or preferably stamped from sheet metal. Said brush holders open outwardly and radially with .respect to the spindle l3 upon which the back the confines of the inner spool, and whereby the plurality of wings. each of which accommodates and is secured to an abrasive strip. .Thus, within limits, any number of abrasive strips may be conveniently anchored by one pin.

The full nature of the invention will be 'understood from the accompanying drawings and the following description and claims:

Fig. 1 is a perspective view of the abrasive head mounted in position for the sanding operation.

Fig. 2 is a perspective view of the head with parts removed.

' tend the iullwldth of the head with the fibres or I plate It is locked for rotation therewith. The side walls of the holders are angled slightly toward each other to provide a restricted slot or opening for slidably're'ceiving and retaining the respective brushes [8.

The brushes l6 primarily serve the purpose of flexibly backing up the abrasive strips and exbristles thereof, extending radially outwardly.-

The fibres of the brushes are clamped in the usual manner near the anchor'end of the brush to form a compact base I! which may be encased with a metalstrip, said base ll being of a'form and size to conveniently slide endwise into the respective holders [5 and be anchored therein by the side walls forming the restricted opening or slot. By means of this construction the brushes may be readily assembled'and removed from the head, and due to the holders being formed of a series of U-shaped channels to slidably receive the respective brushes, any desired number and spacing of such holders may be provided to accommodate the desired number of abrasive strips and brushes.

Surroundingthe spindle II there is a plurality of pins It for anchoring the abrasive strips.

. n 3 Baid pins are spaced from and about the shaft in parallel relation thereto and to each other. By reason of the anchoring arrangement of the abrasive strips it becomes necessary only to provide one anchoring pin for a group of strips and their backing up brushes l8. Anchored by the pins I8 there is provided an abrasive strip l9 for each opening between the holders l arranged to extend outwardly to lie adjacent their respective brushes. Said strips are wound upon each other to form a roll about the spool comprising the anchor pins l8. Thus, as the abrasive strips are used or worn out, they may be partially unrolled from about the spool so as to bring a new portion into use, the used portion being clipp d off.

After the brushes It have been slipped into place in their respective holders and the abrasive strips ll anchored to the pins I8, as shown in Fig. 3, the cover plate or. cap is locked to the spindle to extend thereover. The cover plateis provided on its inner surface with a seating ring 20a having spaced depressions 28b arranged to engage and interlock with the ends of the anchor pins 18. Also about its inner peripheral surface,

1 iiTiaprovided with means, such as the annular bead 20c having interlocking engagement with notches formed in the adjacent ends of the holders I5. Thus with the cover plate '28 secured on the spindle, the holders l5 and pins l8 are locked in operative position.

In order that a comparatively few pins l8 may accommodate a larger number of abrasive strips and brushes, the anchored ends of the strips are arranged in multiple. Thus, as shown in Fig. 3, for example, there are thirty-two brushes and abrasive strips, whereas there are only eight pins. This is accomplished by providing a fabric anchor loop 2| formed to be slid over the free endsof the respective anchor pins. As herein illustrated, theanchor loop is formed from a plurality of sheets of gummed fabric grouped and folded intermediate their ends so as to be stitched, riveted or otherwise secured as indicated at 22 to provide the looped portion and outwardly flared wing portions 23. Each of the said wing portions is arranged for attachment to one or more abrasive strips, either by adhesive, as herein shown, stitching or clamping in any desired manner. With the anchor loop mounted about one of the anchor pins, any desired multiple of the abrasive strips maybe embodied in the roll to extend through a corresponding number of slots adjacent the brush holders and their respective brushes.

This arrangement permits of complete freedom in respect to the number of brushes and abrasive strips employed without regard to the number of anchoring pins or the limited space in which they are mounted. It also permits of convenient handling and assembling of the abrasive strips with their anchor loops which may be provided in packaged groups ready to be slipped into position on the anchor pins with the individual strips 4 and collar, with the pins I 8, are free to rotate relative to the holders l5.

The

collars

25 and 28 are each provided with a bore 30 to receive a wrench pin. By thus holding collar 25 and the brush holders stationary when the nut 21 is loosened, and rotating collar 29 relative thereto, plate 20 and pins l8 may be turned to reel up the abrasive strips or permit them to be unreeled and drawn outwardly to present new abrasive .suriaces.

The invention claimed is:

1. An abrasive head including a predetermined number of outwardly extending brushes spaced from each other about the periphery thereof, a. plurality of abrasive strips rolled upon each other within said head with the free end ofat least one of said strips extending outwardly between adjacent brushes, a. support for said brushes, an

annular series of anchor members less in number than said brushes and abrasive strips carried by said support inwardly of and concentrically with said brushes to provide a, spool and anchor for the inner ends oi. said strips, and a connecting element secured to a plurality of said strips.

adapted to interlock with each of said anchor members.

2. An abrasive head including a predetermined number or closely spaced brush supporting holders, an annular back plate for supporting said holders about the outer edge thereof to extend perpendicularly thereto, each of said holders being generally U-shaped in cross section to provide a.

channel with a restricted opening for slidably receiving the base of an outwardly extending brush, the base of each brush being pinched to slide longitudinally of said holder and interlock with the walls thereof against outward displacement, a plurality of abrasive strips rolled upon each other within said head with the free end of at least one of said strips extending outwardly between adjacent holders, an annular series of anchor members less in number than said holdders and abrasive strips rotatably carried by said base plate inwardly of and concentrically with said holders to provide a spool and anchor for the inner ends of said strips, and a connecting element secured to a plurality of said strips adapted to interlock with each of said anchor members.

3. An abrasive head including a predetermined from each other about the periphery thereof, a, plurality of abrasive strips rolled upon each other within said head with the free end of at least one of said strips extending outwardly between adjacent brushes, a support for said brushes, an annular series of anchor pins less in number than said brushes and abrasive strips rotatably carried by said support inwardly of and concentrically with said brushes to provide a spool and anchor for the inner ends of said strips, and means for anchoring a, plurality of said strips to each of said anchor pins comprising a looped sheet adapted to be slidably mounted over each of said anchor pins formed with wing for connection with the inner ends of the respective abrasive strips.

4. An abrasive head including a predetermined number of closely spaced brush supporting holders, an annular back plate for supporting said holders about the outer edge thereof to extend perpendicular thereto, each of said holders being generally U-shaped in cross section to provide a channel with a restricted opening for slidably receiving the base of an outwardly extending brush. the base portion of each brush for the inner ends of said strips, and a looped fabric adapted to be, slidably mounted over each of said anchor pins formed with wings for connection with the inner ends of a plurality of abrasive strips, whereby a plurality of said strips may be anchored to one of said pins. 7

5. An article of manufacture comprising a sheet of flexible material looped intermediate its ends to receive an anchor pin therein, and means for securing the looped portion of said sheet to provide a plurality of freely extending wing portions for attachment to the anchored ends of a plurality of abrasive strips.

6. An article of manufacture comprising a'sheet of flexible material looped intermediate-its ends to receive an anchor pin therein, means for securing the looped portion of said sheet to provide a plurality of freely extending wing portions, and means on each of said wing portions for attaching the end of an abrasive strip thereto.

7. In an article of manufacture, a plurality of abrasive strips, an anchor therefor comprising a fabric sheet looped intermediate its ends to re ceive an anchor pin therein, means for securing the looped portions of said sheet to provide a plurality of freely extending wing portions, and means for attaching an abrasive strip to each of said wing portions.

8. In an abrasive head having an annular series or brushes spaced from each other and a lesser number of anchor pins mounted inwardly thereof for anchoring a greater number of abrasive strips, at least one strip for each brush, an anchor for said strips comprising a sheet of flexible material looped intermediate its ends to receive an anchor pin therein, means for securing the looped portion of said sheet to provide a plurality of freely extending wing portions, and means for sive strips than anchor pins, at least one strip for each brush, an anchor for said strips comprising a sheet of material looped to receive one of said anchor pins therein and having a plurality of free wing portions extending outwardly therefrom, and means for securing the end of an abrasive strip to each of said wing portions.

10. An article of manufacture comprising a sheet of flexible material looped intermediate its ends to receive an anchoring element therein, and means for securing the looped portion of said sheet to provide an outwardly extending wing portion for attachment to the anchored ends of a plurality of abrasive strips.

11. An article of manufacture comprising a sheet of flexible material looped intermediate its ends to receive an anchoring element therein, means for securing the looped portion of said sheet to provide an outwardly extending wing portion, and a plurality of abrasive strips each having its anchored end secured to said wing portion. /g g 12. An article of manufacture comprising a sheet of fiexlblmafterial folded over upon itself to form an anchor receiving loop, the folds of said sheet being secured together adjacent the loop to provide an outwardly extending wing portion, and a plurality of abrasive strips each having its anchored end secured to said wing portion. ERNEST H. BRADLEY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 564,587 Black July 28, 1896 2,194,577 Yonnegut Mar, 26, 1940 1,978,681 MacGregor Oct. 30, 1934 2,125,460 Plengemeier Aug. 2, 1938