US2242377A

US2242377A - Sanding drum

Info

Publication number: US2242377A
Application number: US289413A
Authority: US
Inventors: William H Van Zomeren
Original assignee: Individual
Current assignee: Individual
Priority date: 1939-08-10
Filing date: 1939-08-10
Publication date: 1941-05-20
Anticipated expiration: 1958-05-20

Description

y 20, 1941- w. H. VAN ZQMEREN 2,242,377

SANDING DRUM Filed Aug. 10, 1939 2 Sheets-Sheet 1 INVENTOR.

Patented May 20,1941

' STAT This invention relates to improvements in sanding drums.

The main objects of my invention are:

First, to provide an improved sanding drum to which thesanding or polishing web may be .5'

applied without removing the drum from the arbor.

Second, to provide a sanding drum having this advantage in which the web is efiectively held, the structure is strong and durable and at the same time light in weight and very economical in its parts.

Further objects relating to details and economies of my invention will definitely appear from the description to follow. The invention is de- 1 fined in the claims.

A structure embodying the features of my invention is illustrated in the accompanying drawings, wherein:

Fig. 1 is a perspective view illustrating the 529 drum of my invention removed from the arbor of a sanding machine or device and with a sanding or polishing weboperatively secured thereon.

Fig. 2 is a fragmentary view in section on a line corresponding to line 2.2 of Fig. 3, illus- .1 1 trating details of the construction.

Fig. 3 is a view in front elevation illustrating the manner of manipulating the drum of my invention to renew or replace the abrasive web thereon.

Fig. 4 is a view in front elevation illustrating a modified embodiment of my invention, the manner of manipulating the same being illustrated in dotted lines.

Fig. 5 is a fragmentary detail View in section on line 55 of Fig. 4.

Fig. 6 is a view in section similar to Fig. 2, illustrating modified means for holding the coacting drum elements together in operative posi-, tion.

Fig. 7 is a fragmentary view illustrating the manner of manipulating the means of Fig. 6 in removing the drum from the arbor or for replacing the abrasive web thereof.

Fig. 8 is a view similar to Fig. 3, still further illustrating the manner of manipulating the modified embodiment of Figs. 6 and '7 to replace the abrasive web.

Fig. 9 is a view similar to Fig. 6, illustrating a still further modified form of securing means for the coacting drum elements.

Fig. 10 is a fragmentary perspective view of an elongated drum of which the drum assemblies of my invention may form a part, being partially broken away to illustrate the interior of the drum 55 and the manner in which it is made up from a plurality of drum assemblies.

In the drawings, the reference numeral l generally indicates the drum assembly of my inven-'- tion, which consists of a central hub member 2 adapted to be removably secured on the-arbor 3-of a sanding or polishing machine or device, as illustrated in Fig. 2, a washer sand nut 5 threadedly received by the arbor being employed 'for this purpose. The hub member 2 preferably has an integral, annular, radially extending web or flange 6 adapted to receive an internal annular channel 1 carried by the drum 8 of the assembly.

This drum, in the preferred embodiment, is

made up of pairs of'sheet' metal stampings in the form of centrally aperturedsemi-circular disks 9 having parallel oppositely disposed axial flanges 1-0. The radially extending webs ll of the semi-circular disks 9 are'each offset axially in the direction of its corresponding flange so that when the two thereof are united as by spot welding I2 with the respective flanges extending in opposite directions,- a semi-circular drum element IZI is formed, having the inwardly opening semi-circular channel 1.

A pair of the drum elements l2! made up as described above are hingedly connected by a hinge which is generally designated l3 and one of these hingedly connected semi-circular drum elements is mounted'on the web 6 of the hub member 2 with the channel 1 receiving the latter web or flange and rigidly secured thereto as by rivets I l. The other of the welded disk elements has its webs H apertured and struck out in an axial direction at the channel 1 to provide axially alined holes'or apertures l5, 86 to receive a conicalheaded screw ll, which screw is threadedly received in hole l5. The material adjacent aperture I6 is flared outward to provide a conical seat 16] to receive the screw and the web or flange 6 of the hub member is'provided with a chordlike slot l8 terminating in a conically counterbored aperture IE! to likewise receive the conical head of the screw ll, so that when the semicircular drum elements .lZl are brought together and the-screw ll istightened, the said disk elements are held in operative position by the engagement of the head of the screw in'this counterbored aperture. The shank of the screw'is receivable in the slot I8 in manipulating the parts and upon tightening the head thereof is engageable with the counterbored opening to lock the parts against outward separation. The

thus associated flanges l0 coact to provide the 'edly receive a locking ring supporting surface of the drum upon which is mounted a resilient backing pad 26. Each of the semi-circular drum elements carries a pin or penetrating point 2| engageable with an end of the abrasive web 22 to anchor the same in position on the pad. In use, the semi-circular disk elements are separated as illustrated in Fig. 3, and to replace a worn abrasive web, the ends of the new web are secured on the points 2|, the drum elements l2 being then brought'together and locked by tightening screw l1 to thereby tension the web.

To protect the ends of the resilient cushion 20, I provide the segments with angled guard members 34 which overlie the ends of the cushionand sustain the pull of the band at this point. The purpose of these guardsis to prevent the of Figs. 1, 2, and 3, to maintain the thus locked up assembly on the arbor.

As illustrated in Figs. '7 and 8, when it is desired to replace the sanding web 22, this may be accomplished without removing the assembly band from distorting the cushions at this point, which would result in an objectionable depression in the surface of the wheel or drum. These guard elements also have the further advantage of counterbalancingthe hinge l3.

In Figs. 4 and 5, I illustrate a modified embodiment of my invention, wherein the semicircular disk or drum elements 23 are die cast and are provided with the flanged coacting semi-"circular drum surfaces 24 and radial stiffening flanges 25. One. of these die cast elements includes an integral hub portion 26 receivable on the arbor 3" and the other thereof has a complementary portion 21 coactingwith the hub portion 26 which is cut away to receive it and provide an equal distribution of the weight of the device. The hub carrying element is also provided with a slotted tongue 28 projecting from its side, this tongue being 'ofi'set slightly axially at 29 toaccommodate the web of the other disk element. The slot in'tongue 23 terminates in a conicallycounterbored opening 30' therein to receive the conical headed screw 3| which is threaded in the elementwhich overlaps the tongue in a manner similar to that discussed in the embodiment of Figs. 1 to 3. In the embodiment of Figs. 4 and 5, the bosses 32 drum elements are formed in the casting operation and drilled to receive a hinge pin 33. Y

for the hinge pivots pivotally connecting the from the arbor by'merely backing off the locking ring 36, as illustrated in Fig. 7, this ring telescoping over the smaller securing nut 5. With the parts in this position, the drum elements or semi-circular disks 9 may be swung apart to position illustrated in Fig. 8 for replacement of the abrasive web. Of course, if it is desired toremove the assembly from the arbor, all that is necessary is to back off the securing nut 5.

In Fig.- 9, I illustrate a still further modification of the aforesaid axial securing means for the assembly in the form of a special locking nut 38 internally threaded to threadedly engage directly on the arbor and provided with an axial recess 39 receiving hub 2, which recess has a tapered or conical annular side wall wedgingly engageable with the annular lips 34 in the manner of the locking ring 36 in Fig. 6. This embodiment eliminates one of the parts required in'that of Fig. 6. The operations of releasing the drum elements for replacement of the abrasive web and for removing the drum from the arbor are obvious and similar to those described in connection with Figs. 7 and 8.

In the embodiment of Fig. 1, the rivets [4 are employed to secure the fixed semi-circular drum element or disk 9 to the hub web 6, while in Fig. 6 this is accomplished by a welding operation at the point 4|. Within the scope of my invention, these expedients are equivalents and. furthermore, the connection of the sheet metal channel II to the hub may be made by remov- The manner of using the assembly of Figs. 4

and 5 is similar in all respects to that of Figs. 1 to 32nd in each of the embodiments the coacting 'disk or drum elements are firmly held in operative relation by the coaction of the conical or large headed screw with the conically 'formed or counterbored screw receiving recess. The sanding web or moved without removing the drum from the arbor. In some types of sanding machines, this is a very great advantage. A further advantage of the structure is that theweb or band is readily applied so that it is held in tightly embracing B0} relation with the drum. Y r In Figs. 6, 7, and 8, I illustrate furthermodified means for securing .the drum elements together in operative position, these drum ele- 'ments being generally similar to and constructed in the same manner as those illustrated in Figs. 1, 2, and 3, save for the fact that theradially extending sheet metal webs II are pro- 'vided at their inner periphery adjacent the hub member Zwith annular out-turned lips 34 adapted", to engage the vhub 2 in operative position. The hub-is provided with an integral externally threaded axial extension 35 adapted to thread- 36 having a tapered opening 31 engageable over the annular lips band may be quickly re- 5) able means such as screws ii desired in order to enable a given channel to be associated with hubs having arbor receiving openings of different size. e

In any of the embodiments illustrated in Figs. 1 to 3 and 6 to 9, the use of a hub member 2 having a radial web 6 receivable in the similarly-formed semi-circular channels I of the drum elements provides a structurewhich is easy to a semble. which efiectively maintains the axial alinement of'the two pivoted sheet metal drum elements and which. moreover. enables these elements to be quickly applied to the arbor of the sanding machine with a minimum of difficulty.

In-some instances, it may be desirable to furnish a sanding drum of greater axial dimension than those illustrated in Figs. 1 to 9 of the present application. In such case. it is possible to produce a unitof greater axial length by connecting a pair of axially alined drum assemblies in' accordance with my invention by means of an elongated metal bridging the periphery of the assemblies and secured thereto by spot welding at 43. The sheet '42 is secured to the assemblies l in a manner to 34 ments of the assembly in a manner which will be strip 42 wrapped around and,

apparent and when operatively secured or locked on the machine arbor by the means described above constitutes the outermost peripheral web of a relatively elongated drum and supports the elongated resilient backing blanket 44 receiving 'the abrasive web 45. This unit has ample resistance to deflection for ordinary sanding and is built up from assemblies in accordance with my invention at small additional cost.

I have illustrated and described my improve ments in embodiments which are very practical. I have not attempted to illustrate or describe other embodiments or adaptations as it is believed this disclosure will enable those skilled in the art to embody or adapt my improvements as may be desired.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A sanding drum comprising a pair of semicircular drum elements pivotally connected at one side thereof and adapted when brought together to constitute a circular drum for receiving an abrasive web, comprising a hub member having a radially extending annular flange, said elements each having an inwardly opening semiannular channel receiving and engaging said flange, means for rigidly securing one of said elements to the hub member with the channel thereof receiving said hub flange, said flange having a chord-like slot therein terminating in a counterbored axially extending hole, the other of said elements having an axially extending hole adapted to be alined with said first named hole when the channel thereof is in operative receiving relation to said flange, and a headed screw carried by the last named element and movable in said slot, the shank of said screw extending through said holes in the operative position of the elements and the head of the screw engaging the counterbore of said flange hole to secure said screw carrying element from separating movement relative to the flange.

2. A sanding drum comprising a pair of segmental pivotally connected drum elements adapted when brought together to constitute a circular drum for receiving an abrasive web, comprising a hub member having a radially extending annular flange, said elements each having an inwardly opening channel receiving and engaging said flange, means for rigidly securing one of said elements to the hub member with the channel thereof receiving said hub flange, said flange having a chord-like slot therein terminating in a counterbored axially extending hole, the other of said elements having an axially extending hole adapted to be alined with said first named hole when the channel thereof is in operative receiving relation to said flange, and a headed screw carried by the last named element and movable in said slot, the shank of said screw extending through said holes in the operative position of the elements and the head of the screw engaging the counterbore of said flange hole to secure said screw carrying element from separating movement relative to the flange.

3. A sanding drum comprising a pair of segmental pivotally connected drum elements adapted when brought together to constitutea circular drum for receiving an abrasive web, comprising a hub member having a radially extending annular flange, means for rigidly securing one of said elements to the hub member, said flange having a chord-like slot therein terminating in a counterbored axially extending hole, the other of said elements having an axially extending hole adapted to be alined with said first named hole when in operative relation to said flange, and a headed screw carried by the last named element and movable in said slot, the shank of said screw extending through said holes in the operative position of the elements and the head of the screw engaging the counterbore of said flange hole to secure said screw carrying element from separating movement relative to the flange.

4. A sanding drum comprising a pair of segmental pivotally connected drum elements adapted when brought together to constitute a circular drum for receiving an abrasive web, a hub member, means for rigidly securing one of said elements to the hub member, said hub member having a chord-like slot therein terminating in a counterbored axially extending hole, the other of said elements having an axially extending hole adapted to be alined with said first named hole when in operative relation to said flange, and a headed screw carriedby the last named element and movable in said slot, the shank of said screw extending through said holes in the operative position of the elements and the head of the screw engaging the counterbore of said flange hole to secure said screw carrying element from separating movement relative to the flange.

5. A sanding drumlassembly comprising means adapted to be attached to the arbor of a sanding machine and including a segmentalv drum element, and a further segmental drum element pivotally connected to said first element, said elements when brought together constituting a circular drum for receiving an abrasive web, one of said elements being secured in angularly fixed relation to said arbor and provided with a meme her having a slot terminating in a counterbored axially extending hole, the other of said elements having an axially extending hole adapted to be alined with said first named hole when in operative position, and a headed screw carried by the last named element and movable in said slot, the shank of said screw extending through said holes in the operative position of the elements and the head of the screw engaging said counterbore to secure said screw carrying elements from separating movement.

6. A sanding drum assembly comprising means adapted to be attached to the arbor of a sanding machine and including a segmental drum element, and a further segmental drum element pivotally connected to said first element, said elements when brought together constituting a circular drum for receiving an abrasive web, one of said elements being provided with a member having a counterbored axially extending hole, the other of said elements having an axially extending hole adapted to be alined with said first named hole when in operative position, and a headed screw adapted. to coact with said holes, the shank of said screw extending through said holes in the operative position of the elements and the head of the screw engaging said counterbore to secure said screw carrying elements from separating movement, one of said elements being in angularly fixed relation to said arbor.

'7. An assembly of the type described comprising a pair of segmental disk elements having means for pivotally connecting the same at one side thereof, means fixedly securing one of said elements to the arbor of a sanding machine, and means for securing said elements in operative relation to constitute a drum for receiving a surface finish strip, comprising a member in fixed relation to one of saidelements having a chord-like slot opening to the exterior thereof and terminating at its inner end in a counterbored recess, the other of said elements having a screw threaded therein and extending therethrough, substantially parallel to the axis of the drum, said'screw being shiftable in said slot in a direction parallel to the length of said axis and provided with an enlarged conical head engaging in said counterbore when the screw is tightened with the elements inoperative relation to thereby prevent subsequent separating movement of the elements.

8. An assembly of the type described comprising a pair of segmental die cast disk elements having means for pivotally connecting the same at one side thereof, hub means cast integral with one of said elements for mounting the assembly on the arbor of the sanding machine, and means for securing said elements in operative relation to constitute a drum for receiving a surface finish strip, comprising a projecting member in fixed relation to said one of said elements hav a chord-like slot opening to the exterior thereof and terminating at its inner end in a counterbored recess, the other of said elements having a screw threaded therein and extending therethrough substantially parallel to the axis of the drum, said screw being shiftable in said slot in a direction parallel to the length of said axis and provided with an enlarged conical head engaging in said counterbore when the screw istightened with the elements in operative relation to thereby prevent subsequent separating movement of theelements.

9. A drum comprising a flanged hub having a slot extending from the periphery thereof terminating in acountersunk recess, a pair of segmental complementary drum elements each formed of a pair of flanged sheet metal members disposed back to back to provide a rim portion and having oppositely struck-out web portions receiving the flange of said hub, the web portions of one member being fixedly secured to the flange of the hub, the other member being swingably secured to the fixed member and adapted to telescopingly engage said hub flange, a clamping element carried by the swingable member adapted to enter said slot and having an inwardly tapered head engageable with said recess for clamping the swingable element in its closed position, a web supporting cushion secured tothe rim of said drum, said rim being provided with angled guard members overlying the ends of the cushion, and web engaging pins carried by said drum elements adjacent said guards and with which a web drawn over said guards may be engaged.

10. A drum'comprising a flanged hub having a. slot extending from the periphery thereof terminating in a countersunk recess, a pair of segmental complementary drum elements each formed of a pair of flanged sheet metal members disposed back to back to provide a rim portion and having oppositely struck-out web portions receiving the flange of said hub, the web portions of one member being fixedly secured to the flange of the hub, the other member being swingably' secured to the fixed member and adapted to telescopingly engage said hub flange, a clamping element carried by the swingable member adapted to enter said slot and having an inwardly tapered head engageable with said recess for clamping the swingable element in its closed position, and a web supportingcushion secured to the rim of said drum.

11. A drum comprising a flanged hub, a pair of segmental complementary drum elements each formed of a pair of flanged sheet metal members disposed back to'back to provide a rim portion and having oppositely struck-out web portions receiving the flange of said hub, the web portions of one member being fixedly secured to the flange of the hub, the other member being swingably' secured to the fixed member and adapted to telescopingly engage said hub flange, means for detachably securing said swingable member to said hub flange, a web supporting cushion secured to the rim of said drum, said rim being provided with guard elements overlying the ends of the cushion, and web engaging pins carried by said drum elements adjacent said guards and with which a web drawn over said guards may be engaged.

12. A drum assembly of the type described adapted for ready positioning and securing on the arbor of an actuating machine and for ready removal and replacement of a surface finishing web thereon, comprising a hub member adapted to be positioned on said arbor and to abut a shoulder on the latter, a pair of coacting drum elements pivotally connected togethensaid drum elements each being made up of a pair of flanged sheet metal members disposed back to back and secured together to provide a rim portion and having oppositely struck-out web portions providing aninternal semi-circular annular channel, said hub member having a radially extending annular flange receivable in the channels of said elements, means for fixedly securing said flange 'in one of said channels, and means for locking the elements in operative coacting relation with the other channel receiving said hub flange, comprising a locking ring threadedly engaging said hub and having an inner tapered binding surface, said elements having out-turned lips at the inner edges of the channels receivable in said locking ring and engageable by said binding portion to restrain the elements from separation.

13. A drum assembly of the type described adapted for ready positioning and securing on the arbor of an actuating machine and for ready removal and replacement of a surface finishing web thereon, comprising a hub member adapted to be positioned on said arbor and to abut a shoulder on the latter, a pair of coacting drum elements pivotally connected together and each of which has an internal semi-circular annular channel, said hub member having a radially extending annular flange receivable in the channels of said elements, means for fixedly securing said flange in one of said channels, and means for locking the elements in operative coacting relation with the other channel receiving said hub flange, comprising a locking ring threadedly engaging said hub and having an inner tapered binding surface, said elements having out-turned lipsat the inner edges of the channels receivable in said locking ring and engageable by said binding portion to restrain the elements from separation. 4

14. A drum assembly of the type described adapted for ready positioning and securing on the arbor of an actuating machine and for ready removal and replacement of a surface finishing web thereon, comprising a hub member adapted to be positioned on said arbor and to abut a shoulder on the latter, a pair of coacting drum elements pivotally connected together, said drum elements each being made up of a pair of flanged sheet metal members disposed back to back and secured together to provide a rim portion and having oppositely struck-out Web portions providing an internal semi-circular annular channel, said hub member having a radially extending annular flange receivable in the channels of said elements, means for fixedly securing, said flange in one of said channels, and means for locking the elements in operative coacting relation with the other channel receiving said hub flange.

15. A sanding drum assembly adapted for ready positioning and securing on the arbor of a sanding machine and for ready removal and replacement of an abrasive Web thereon, comprising a hub member adapted to be positioned on said arbor, a pair of coacting drum elements pivotally connected together and each of which has an internal semi-circular annular channel provided with out-turned lips, said hub member having a radially extending annular flange receivable in the channels of said elements, means for fixedly securing said flange in one of said channels, and means for locking the elements in operative coacting relation with the other channel of said movable element receiving said hub flange, comprising a locking ring adapted to be mounted on the arbor and having an inner tapered binding surface engageable with said lips, and means for axially unging said. ring for binding engagement of said surface With said lips. WILLIAM H VAN ZOMEREN.