US2870582A

US2870582A - Inflated grinding wheel

Info

Publication number: US2870582A
Application number: US613574A
Authority: US
Inventors: Raske Arthur
Original assignee: Individual
Current assignee: Individual
Priority date: 1956-10-02
Filing date: 1956-10-02
Publication date: 1959-01-27
Anticipated expiration: 1976-01-27

Description

Jan. 27, 1959 A. RASKE 2,870,582

INFLATED GRINDING WHEEL Filed Oct. 2, 195a INVENTOR.

ARTHUR RASKE /M M*W/ Iu ATTORNEYS United States Patent O INFLATED GRINDING WHEEL Arthur Raske, Willoughby, Ohio Application October 2, 1956, SerialNo. 613,574

4 Claims. (01; 51-192 My inventionrelates too. new anduseful improvement in an inflatedgrinding wheel so constructed and arranged that the supporting body of the wheel on which the abrasive. material is to be mounted may be inflated so as to securely bind the circular band. of abrasive mate= rial which embraces the same.

It is an object of the present'invention to provide a grinding Wheel of this class which will be simple in con struction, economical of manufacture, durable, compact, easily and quickly assembled, and highly efilcient in use.

Another objectof the invention is to provide a grinding wheel. of this class so constructed and arranged that improved concentricity at the periphery of the wheel is accomplished;

Another object of the. invention is the provision of a wheelv of ,this class so-constructed and arranged that an improved. air seal between the inflated body'and 'the rigid core is accomplished soth-at the-internal pressure applied through the air valve will force the inflated embracing member into proper relationship totherigid core without additional processes.

Another object of the invention is the provision of a grindingwheel of thistype so constructed 'that no axial pressures are exerted upon the core member.

Another object of the invention is the provision of a grinding wheel of this type having a rigid core: member provided with inwardly directed threaded passages for reception of the valve stem, thus eliminating thenecessity of a special valve housing,

Another object of the invention is the. provision offja grinding Wheel of this class so constructed and;arrang. ed that it may be economically manufactured due to the fact that the rigid core may remain constant for various diameters of inflated drums or parts.

Another object of the invention is to provision in a grinding Wheel of this class of a drum or inflatable annular member so constructed and arranged that a stable balanced wheel will be provided and the drum or inflatable member will be prevented from flying oil of the rigid core.

Other objects will appear hereinafter.

It is recognized that various modifications and changes may be made in the detail of structure illustrated without departing from the invention and it is intended that the present disclosure shall be considered to be but the preferred embodiment.

Forming a part of this application are drawings in which:

Fig. 1 is an end elevational view of the invention;

Fig. 2 is a sectional view taken on the line 2-2 of Fig. 1; p

Fig. 3 is a fragmentary enlarged sectional View taken on the line 33 of Fig. 2, showing the valve in closed position;

Fig. 4 is a view similar to Fig. 3, but showing the valve in open position.

2,870,582 Patented Jan- 27,1959

ice

As; shown in the drawings, the invention: comprises a rigid coreL7; made fromanysuitable materialand'pref erably of; metaL- I have. found that. it is an advantage to constructthis core from alight metal, such as aluminum. This corez7 has a. threaded bore 8 formed-therethrough extending from end to end. At theopposite ends of the core 7 is an inwardly directed flange-9 to provide acircular groove10t Theop-positeend faces'of thecore-arecounter-bored inwardly as'at 11-; Formed in..one. of the end:- faces of the core- 7, at the inwardly bored portion 11 is a threaded passage 12 in whichv is threaded. a shell or: housing 13, through which slid-ably projects-a valve stem 14 carrying at. its inner'end" the valve head. 15 :which, when.: the valve is in closed position, will. engage against the end of theshell 13 and elfectanair seaL.

Embracing. the stem 14 is a coil spring 16 which bears atone enduagainst the. reduced end of the shell 13 and atits opposite' end against the collar 17' formed onthe valve-stem 14.. Theconstruction of this valve is similar to' that used.on vehicle tires and will sometimes be re ferred to. herein as a tire valve. The shell 13 opens at its inner end into the passage 18 communicating with the lateral passage 19.

An inflatable drum isused with this mechanism and comprises an annular. member'having the periphery forming-member 20 and the side Walls 21 and 2-2 which are inclinedv to. the periphery. 2.0. I Each of these side walls is providedwitha head" 23 embodying a flange 24 whicli is adapted to snugly engage in the groove 10. The in-'' nerifaceofthis head engages firmly against the periphery 26 of the rigid core: 7. It will be noted that'thi's head extends outwardly of the flange 9 so as to' fill the groove 10,. and. also. extends'inwardly from thisflange' adis' tance so that the'heads on the opposite side-

walls

21 and 22 project inwardly toward each other but are. spaced apart. At. the. space separating the opposed ends 05 this .head, the passage 19 is located.

11151156, the inflatable drum is embraced' by an endless band:25- of. suitable abrasiveor grinding =material l may be forced under pressure into the interior of tlie inflatable drum, through. the valve, and through are passages 18-and519', so as to force theperiphery 2W of this inflatabIedrum outwardly into tight engagement with the 'encirclingba'nd .25 of abrasive material.

A threadedbores may bemade-a. proper; 'sizestor recei virig a power spindle which will serve to rotate the grinding wheel when in use.

It will be noted that as the air is forced into the inflatable drum, the air pressure will move the various parts into assembled relation to the rigid core 7. Due to the large supporting area at the heads 23, the concentricity of the periphery 20 is improved.

Experience has shown that the core member is possessed of a greater life because there are no pressure exerting members directing the pressure axially of the core, as is common in inflatable grinding Wheels.

Experience has also shown that this type of grinding wheel structure is more readily and cheaply manufactured in special sizes than other inflated wheels presently on the market because of the lack of special tooling and molds required for any part except the drum. It is, of course, obvious that for a core 7 of a certain size, the dimensions of the drum can be varied only diametrically as the heads 23 and the flanges 24 would remain the same.

What I claim is:

1. In an inflated grinding Wheel of the class described comprising: a rigid solid core having a threaded opening formed centrally therethrough and provided on its periphery, at opposite ends, with parallel flat faces, and

provided on its periphery, at each opposite end, with an inwardly directed flange to provide oppositely disposed peripheral grooves, the inner surface of each of said flanges being in alignment and parallel to the axis of said core; an inflatable, flexible drum comprisingtan annular trough-shaped band having sides inclined inwardly toward each other embracingsaid core;.a head on the end of each of said sides, each of said heads having an outwardly projecting flange for engaging between said core and the inwardly directed flange on said core, said flanges on said head having on their inner and outer surfaces :1 surface parallel to the axis of said drum.

2. In an inflated grinding wheel of the class described comprising: a rigid solid core having a threaded opening formed centrally therethrough and provided on its periphery, at oppoiste ends, with parallel flat faces, and provided on its periphery, at each opposite end, with an inwardly directed flange to provide oppositely disposed peripheral grooves, the inner surface of each of said flanges being in alignment and parallel to the axis of said core; an inflatable, flexible drum comprising an annular trough-shaped band having sides inclined inwardly toward each other embracing said core; a head on the end each of said sides, each of said heads having an outwardly projecting flange for engaging between said core and the inwardly directed flange on said core, said flanges on said head having on their inner and outer surfaces at surface parallel to the axis of said drum; said heads lying in snug engagement with the periphery of said core and the outer surfaces of the flanges on said heads lying snugly in engagement with the inner surfaces of said core; said heads terminating in spaced relation at adjacent sides to provide a passage therebetween.

.3. In an inflated grinding wheel of the class described comprising: a rigid solid core having a threaded opening formed centrally therethrough and provided on its periphery, at opposite ends, with parallel flat faces, and provided on its periphery, at each opposite end, with an inwardly directed flange to provide oppositely disposed peripheral grooves, the inner surface of each of ,said flanges being in alignment and parallel tothe axis of said1 cdre; an inflatable, flexible drum comprising an annular trough-shaped band having sidesinclined inwardly toward each other embracing said core; a head on the end ,of each of said sides, each of said heads having an outwardly projecting flange for engaging between said core and the inwardly directed flange on said core, said" flanges on said head having on their inner and outer surfaces 8. surface parallel to the axis of said drum;

said heads lying in snug engagement with the periphery i an inwardly directed flange to provide oppositely dis of said core and the outer surfaces of the flanges on said heads lying snugly in engagement with the inner surfaces of said core; said heads terminating in spaced relation at adjacent sides to provide a passage therebetween; said core having projecting inwardly from one of its side faces an axially directed passage communicating a radially directed passage with the interior of said drum through the space between the opposed faces of said heads. a

4. In an inflated grindingwheel of. the class described comprising: a rigid solid core having a threaded opening formed centrally therethrough and provided on its periphery, at opposite ends, with parallel flat faces, and provided on its periphery, at each opposite end, with posed peripheral grooves, the inner surface of each of said flanges being in alignment and parallel to the axis of said core; an inflatable, flexible drum comprising an annular trough-shaped b-and having sides inclined inwardly. toward each other embracing said core; a head on the end of each of said sides, each of said heads having an outwardly projecting flange for engaging between said 1 said heads lying in snug engagement with the periphery" core and the inwardly directed flange on said core, said flanges on said head, having on their inner and outer surfaces a surface parallel to the axis of said drum;

of said core and the outer surfaces of the flanges on said heads lying snugly in engagement with the inner surfaces of said core; said heads terminating in spaced relation at adjacent sides to provide a passage therebe 3 tween; said core having projecting inwardly from one of its side faces an axially directed passage communicating a radially directed passage with the interior of said drum through the space between the opposed faces of said heads; and an air valve mounted in said axially directed passage in said core at the outer end of said passage for permitting the flow of air under pressure therethrough into the interior of said drum and preventing the flow of air under pressure outwardly thereof.

References Cited in the file of this patent UNITED STATES PATENTS