US2206355A - Abrading wheel - Google Patents

Description

y 1940. E. B. HUB-HARD 2,206,355

ABRADING WHEEL Filed March 25, 1940 ISmacntor ELSE/2TB. Hues/m0 attorneys Patented July 2,-194Q UNITED STA-T 32,206,255 v c ABRADING a Elbert B. Hubbard, Sumter, ispoaassignor, to

Williams Furniture Company, Sumter, S. corporation of South Carolina ApplicationlVIar 4 Q 5 4 4 Claims." (01. 51-1 .1...

This invention relates to a rotary sanding Wheel which is used in connection with the manufacture and finishing of furniture and the like.

More specifically-the invention relatesv toha sanding wheel having a sanding strip secured to the periphery thereof, said securing means being unique in construction and very effective so as to permit easy insertion or removal of the sanding strip on the wheel.

It is an object of this invention to provide a sanding wheel upon which a sanding strip is adapted to be mounted and cantilevered members for holding the sanding strip in position on the wheel. The sanding wheel shown in the-accompanying drawing comprises a body. portion having a resilient rim with radial peripheral grooves therein upon which the sanding strip is mounted. Suitable L-shaped members are cantilevered along one side of the sanding strip at a point slightly removed from the axis of rotation. In order to secure the cantilevered members in the radial grooves, a suitable disk is employed which applies pressure to the heel of the L- shaped members thereby causing the cantilevered 5 or free ends to press the sanding strip firmly into the radially disposed grooves in the resilient rim. Some of the objects of the invention having been stated, other objects will appear-as the description proceeds, when taken in connection with the accompanying drawing, in which-' ;I

Figure 1 is a side elevation showing my improved sanding wheel mountedon a spindle ;L.'

Figure 2 is an elevation looking at the-left hand end of Figure l; i: 3

Figure 3 is a vertical sectional view taken along the line 33 in Figure 2; Figure 4 is a sectional view taken along the line 4-4 in Figure l. .s

Referring more particularly to thedrawing, the numeral it) denotes a spindle or shaft which has integral with one end thereof a restricted extension i I. Mounted upon this extension is a circular body portion i2, which portion has a peripheral flange if: in which a plurality of radially disposed grooves it are out, said grooves running longitudinally of the axis of rotation. The flange i3 is integral with one side of the periphery of the body portion of the wheel. That portion of the periphery upon which there is no flange is of a smaller diameter and is designated by the reference character l5. Upon the periphery I5 is adapted to be mounted an annular resilient ring member 15, which member is, preferably, slightly wider than the width of the peripheral surface iii. In other words, when this resilient member I6 is inserted upon the peripheral. surface I 5, one face thereof abuts the face. i! of the peripheral flange I3, and the'opposed face of the annularresilient member It extends slightly beyond the adjacent face of the body member l2.

. The resilient ring member l6 has a plurality of 1 radially disposedgrooves I9 therein which are adapted to coincide with grooves M in the peripheral flange I,3.;The grooves 19 are also adapted to receive a strip of abrasive material 28, said legof the L-shaped members 25 is pivoted upon a ring 26 whichring is removed a substantial distance, from the bottom of the grooves l9 in the resilient member 16, toward the axis of rotation. The purpose of removing the pivot point of the L-shaped member in this manner has an advantage in jlockingythemembers in position. This advantage will be later described. Of course it is very essentialfor the pivot points of all of the LE-shaped-members 25 to be concentric with the restricted shaft l I and also to be concentric with a circle passing through-the bottom of the grooves l9 and M. The ring 26 is normally confined in a disk 2? by any suitable means such as screws 28,-said .di'sk being mounted upon restricted portion H. -Also,.suitable radially disposed grooves 24 are provided in the. periphery of disk 2'! to accommodate the intermediate portion of L,- shaped members 25. v

. 1 It will be'noted by referring to Figure 3 that the disk-.21 has a bulged portion 29 integral with its right hand face which fits into a cavity 30 in the body portion 12. The body portion l2 has extending therefrom a pin 32 and this pin extends into a hole 33 which penetrates the disk 21. The purpose, of course, of this pin is to serve as an alining means by which the L-shaped members 25 will be properly alined with the slots 14 and [9 in the members I2 and [5 respectively, before the disk can be properly inserted on extension l I. It is therefore seen that the members 25 pivot about wires 26 thereby causing the free ends to be capable of moving into or out of the slots [4 and I9, so as to make it possible to secure or remove the sanding strip 20 on the periphery of the resilient ring l6.

for

In order to provide a suitable means whereby the free ends of the L-shaped members 25 may be held in fixed position within the radial grooves I4 and 19, a suitable flanged nut 35 has been threadably secured upon the end of restricted extension II. This disk is knurled or serrated as at 36 on its periphery which will facilitate the grip of the operator when attempting to remove or insert the flanged nut upon :the shaft. Also this disk is sufficiently large to contact heel portion 25a of the L-shaped members 25 in the manner shown in Figures 1 and 3 thereby causing the L-shaped members to be normally rotated to cause their free ends to move towards shaft IQ. Due to the fact that the heel 25a projeets slight ly farther to the left (Figure 3) than the other downstanding portions of the pivoted leg it is seen that as the nut 35 is tightened, the pressure exerted by the free ends of the members 2,5 u pon the bases of the radial grooves l9 will be increased. As a result, the sanding strip 20 upon the resilient member I6 will be held more firmly. The disk 21 has a bore 31 in the left-hand face thereof (Figure 3) which concentric wit-h the restricted shaft portion II. The purpose of this bore is to eliminate weight and also eliminate any surrounding contact surface upon the threaded end of the shaft, except such surfaces as are threadably secured thereto. When the flanged nut 35 is tightened upon extension II, the disk 21 is also forced against the face of resilient ring 16 and toward body member l3. A nut can be placed on extension II in cavity 31 to confine the disk 2'! against member l2 if desired.

It is therefore seen that I have provided an abrasive tool comprising a rotatable wheel having a wearing strip removably mounted thereon, said fixing means comprising a plurality of cantilevered bars which penetrate grooves in the periphery of the wheel and press the wearing strip in contact therewith at spaced intervals; The apparatus is very simple and easy to operate due to the fact that it is only necessaryto manipulate the nut 35 in order to remove the strip and replace it with a newone.

In the drawing and specification, there has been set forth a preferred embodimentofthe-invention, and although specific terms have been employed, they are used in a generic and descriptive sense only and not for purposes-of limitation, the scope of the invention being set forth in the appended claims.

I claim:

1. In a sanding wheel, a body portion, an annular flange extending from one edge of the periphery of the body portion, said flange .having transverse grooves therein, a disklikeuretainmeans for engaging one leg of said L-shaped members to hold the free end thereof in said groove.

2. A sanding head including a body portion having a peripheral flange, a radially grooved resilient rim held in the angle between the periphery and flange of the body portion, retaining disknormally disposed adjacent one face of said body portion and also one face of the resilient rim to hold it in position against the flange, a

Wearing strip mounted on the periphery of said a resilient rim and means for pressing said wearing strip in close contact with said resilient rim at spaced intervals, said means including a plurality of radially disposed L shaped members pivoted in said retaining disk at a substantial distance inwardly toward the center of the disk from the point of engagement by the L-shaped member with the wearing strip and means for engaging the pivoted ends of all of said L-shaped members to hold the free ends thereof contact with the strip and resilient rim.

3. A sanding head including a body portion having a peripheral flange, a radially grooved resilientrim held in the angle between the periphery and flange of the body portion, an abrasive Wearing strip mounted on the periphery of the resilient rim and extending into the radial grooves, a retaining disk adapted to engage one face of the body portion the resilient rim to hold said rim portion in position against the peripheral flange, radially disposed cantilevered members pivoted to said retaining disk at a point located a substantial distance inwardly toward .the center of the disk from the base of said radial ,grooves and means adjacent the pivot points of said cantilevered members for holding the free ends thereof in engagement with said wearing strip and within said grooves.

4; A' sanding head including a body portion having a peripheral flange, a radially grooved resilientrim held inthe angle between the periphery .and the flange of the body portion, a notched disk, L-shaped members pivoted in said notches at a point substantially removed from E k BERT B. HUBBARD.

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