US1906190A - Surfacing tool - Google Patents

Description

April 25, 192.3.

H. E. TAUTz SURFACING TOOL Filed Nv. 16, 1931 v Patented Apr. 25, 1933- Hamam' a. raurz, or mwauxnn, wrsconsm, wisconsin,

TUBING GOITLN'Y, 0l' MILWAUKEE,

.ABSIGNOB T DELTA. m50- .Av CORPOBATIQN OF fWISOONBm" SUBFACIN 'TOOL I Application tiled November 16.

This invention relates to rotary surfacing tools and has particular application to the construction of abrading tools known as sanding drums.

An object of the invention is the provision Ain a rotary surfacing tooltof a novel mount ing for the work engaging element thereof whereby a uniform bearing and resilient suport is provided or the entire eiective surace of the work engaging element.

Another object is the provision of a surlfacing tool having a support fora work engaging element, which support ossesses inherent resiliency and which is a apted to be forcedl into `holding engagement with the work en aging element.

'A urt er object is the provision of a sanding drum having an inherently resilient supporting b ase for receiving a sanding sleeve and which is provided with means for internally expanding the bas into uniform holding and bearing enga ner face of the sandln sleeve. Other details will be ap arent rom the description.

Itis to be un erstood that the present disclosure shall not constitute a limitation inconsistent with the scope of the invention as claimed. The present disclosure defines a hysical embodiment of the principles of this invention and constitutes a showing of a prefer-red means for reducing the invention to practice. While the disclosed formV has specic reference to a sanding drum it is obvious that the principles can have application t any form of surfacing tool.

In the drawing.: y

Figure 1 is a perspective of a sanding drum constructed in accordance with theinvention.

therethrough.

Figure 3 is a i 3i`3 of Fgure 2.

igure 1s a ou 'ers ective of internal elements off thegdrruriip p In the disclosed embodiment the invention consists of a support in the form of a. spindle 5 provided with a longitudinal keyway 6 and externally threadedl at one end 7 At its op- .5 posite end the spindle is formed with ananement against the in- Figure 2 is a vertical longitudinal section transverse section on the line 1931. Serial No. 575,888..

larged head 8 providedv with a socket bore 9 whereby the spindle may be attached to a driving clement by means of suitable astening elements, here shown as hollow head set screws 10. y y

In making up the tool a metal end plate comprising a disk 11 is slid axially over the s indle from its threaded end to rest against t e head 8, the plate being provided w1th an annular central bore so that a spindle may be inserted therethrough. Following the application of the end plate 11 a substantially resilient core is applied over the spindle in` the same manner. As best shown in Figure 2, this core consists of a series of parallel disks or washers 12 of resilient material 'such as rubber. These washers are provided with central annular bores within which are received metal bushings 13 having a width less than the thickness of the washers. By virtue of the bushings 13 the washers 12 are capable of rotary and axially slidable movemexiit of the spindle in the assembly ofthe. too i The series of members 13 is spaced by means of nonresilient spacer suitable material, preferably bakelite, which are centrally apertured as at 15 to en ageover the spindle, and 4which have chor ial p0rtions 16 adapted to be engaged in the longitudinal keyway 6 of the spindleso that wh1le these spacer disks may be slid axially upon the spindle, rotary movement thereon isl prevented. These spacer disks 14 are of appreciably smaller diameter than the annular resilient members 12. At the outer end of the spindle adjacent the threaded end portion 7 a second metal end plate 17 is disposed over the spindle and is held in place by a securing nut 18 threaded over the spindle end.

Prior to service the assembled spindle and core are arranged so that the resilient members 12 and spacer disks 14 have a relatively loose engagement with respect to their mounting upon the spindle. A work engaging band here shown as a sandin sleeve 19isA then applied over the core by sliding the same axially thereover from one end. The peripheral faces ofthe resilient washers 12 provide a supporting surface for the sanding sleeveA disks 14 of a and as under normal assembly conditions the maximum external diameter `of the members 12 is only slightly less than the internal diameter of the sanding sleeve, the sleeve may be 5. readily positioned over the core and will have relatively loose support thereon.. A

With the .sleeve or work engaging band properly assembled with respect to its resilient supporting core the nut 18 is tightened to clamp against the end plate 17 and force the same axially inward whereupon all of the resilient core members 12 will be compressed between the plates 11 and 17. A continued compression by manipulation of the nut 18 will cause a radial expansion of the members 12 so that their peripheral surfaces will expand uniformly throughout their entire area. This expansion eectively binds the resilient members against the inner face t.. of the sanding sleeve so that the sleeve is firmly anchored with respect to the core and cannot move with respect thereto. At the same time this firm anchorage of the sanding sleeve is accomplished without a loss of re- 2,5. siliency in its support as the material of the members 12 provides an e'ective resilient filler means existing between the supportin spindle and the sanding sleeve.

t is obvious that the bushings 13 will in 3.0i themselves constitute a means acting to limit the compreing movement of the plates l1 and 17 as the spacer disks i4; will ultimately moved into direct engagement with the bushing ends to prevent an undesirahly high 52 degree of compression such as would so expand the core sections as to impart a bursting strain to the sanding sleeve.

I claim:

1. A rotary surfacing tool com rising a spindle, annular core sections of resilient me.. terial axially slidable thereon, non-resilient spacer disks slidable on the spindle and between said eore sections/and means on said spindle for forcing said core sections into radial expansion to hind and hold a. worlr engageable sleeve thereon when applied thereover.

2. A surfacin tool comprising a. spindle, a series of annu ar rubber washers arranged thereon in parallel relation, non-resilient spacers between said washers, end plates on said spindle and bearing upon said washers, a work engageable sleeve slidably applicable over the peripheries of said washers, and means for moving an end late axially inward of the spindle where y to iiorce the f washers into radially expanded holding engagement with said sleeve.

3. In a rotary surfacin tool, a spindle, a core thereon composed 0%' of resilient material and uniform thickness each bein provided with a central bore, nonresilient gearing sleeves'in the section bores 05 and of an axial extent less than the thick ness of the sections, ynon-resilient spacer annular sections members separatn said core sections, and means for compressing the core section axiall of the spindle to cause radial expansion thereof, the ends of said bearing sleeves and the spacer members being engageable under such compression to limit the extent thereof.

4. A rotary surfacing tool comprising a spindle, a series of annular rubber core sections of equal diameter axially movable on said spindle and disposed in parallel relation, rigid spacer discs axially slidable on said spindle and disposed between said core sections, the diameter of said spacer discs being less than the core sections2 end plates on said spindle and bearing a einst the end core sections, a work engagea le sleeve applicable over the peripheries of the core sections, and means for movin an end plate axially inward on the spindle whereby to compress the core sections between said end plates and spacer dises and expand the core sections radially into holding engagement with said sleeve.

In testimony whereof I alx my si attire.

HERBERT E. TA. TZ.

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