US2207225A - Surfacing machine - Google Patents

Description

July 9, 1940.

E. McM. PENNQCK E-r AL 2,207,225

SURFACING MACHINE Filed Oct. 1l, 1935 5 vSheers-Sheex, l

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July 9, l940- E. McM. PENNocK Er AL 2,207,225

SURFACING MACHINE Filed Oct. 1l, 1935 '3 Sheets-Sheet 2 lita/elution?A- fbi/m9044011. P /vNocK @EL ,e/cE

` Avv-ORNE Yr July 9, 1940 E. MCM. PENNocK E-r A1. 2,207,225 Y SURFACING MACHINE F11ed oct. 11, 1935 s sheets-sheet s llllllll- ATTORNEY@ Patented July 9, 1940 UNITED STATES PATENT OFFICE sUnFAoING MACHINE Application October 11, 1935, Serial No. 44,576

6 Claims.

This invention relates to improvements in surfacing machines, and an important object is to provide a surfacing machine having an electric motor-operated rotatable abrading or polishing s means.

An essential object is to provide a detachable hollow abrading or polishing element, with connecting means therefor by which the element can be detachably interlockingly secured to a l=`- spindle, and by which such an attachment can be made, whatever end of the element is first introduced onto the spindle during assembly.

Another object of the invention is to provide a suitable arrangement for detachably securing il. to a spindle an abrading or polishing element of substantially greater length than the spindle, whereby it is possible to use long as well as short elements of this character in a power driven machine without changing the spindle.

n A further object is to provide a securing arrangement for reversibly securing to a power driven spindle an abrading or polishing element of greater length than the spindle, the same being of such character that the element will occupy the same relative position lengthwise of the spindle which ever end of the element is first introduced onto the spindle during assembly.

Another object is to provide a double rod scheme of connection for the hollow abrading or polishing element, which includes one rod which is interlockingly engaged with the spindle, and another rod capable of such interlocking engagement after the shell is removed and reversed end u for end and again placed on the spindle. If said element is a brush, for example, and if the bristles have been bent in one direction to attened and less eective position as a result of use, they can be reversely bent and brought to a more eiective position, by removing the brush, turning it end for end, reconnecting it with the spindle and continuing operation. Such an arrangement is useful particularly where the element is of a length over twice the length of the spindle, and enables the element to .be mounted reversibly in the same position on the spindle.

Features of the invention include all details of construction, along with the broader ideas of means inherent in the disclosure.

Objects. features and advantages of the invention will be set forth in the description of the drawings forming a part of this application, and in said drawings Figure l is a vertical sectional elevation taken u substantially on line I-I of Figure 2;

Figure 2 is a plan view with the major portion of the control bar removed;

' Figure 3 isl a plan section taken approximately on line 3-3 of Figure 1 showing the complete spindle but only a portion of the surface treating member and its surrounding hood;

Figure 4 is a rear elevation;

Figure 5 is a plan of the upper end of the control bar showing the handles and switch box;

Figure 6 is a section showing the locking relation of the brush-securing means to the spindle allowing end to end reversal as employed with a brush substantially twice the length of the spindle;

Figure 7 is a View similar to Figure 6 showing a double rod construction allowing end to end reversal as employed with a brush more than twice the length of the spindle;

Figure 8 is a view illustrating how the bristles ybecome flattened and less effective as a result of rotation in one direction;

Figure 9 shows the brush after end to end reversal;

Figure 10 shows.how the bristles are made more effective during continued abrasive action after reversal.

Numeral I indicates the rear plate-like section of a two-section machine base. Referring to Figures 1 and 2: Numeral 2 generally indicates the front section having, see Figure 3, a forwardly or longitudinally extending upright wall 3, and a transversely extending upright wall 4, at right angles to the wall 3, and integrally connected therewith. The upper periphery 'I of the wall 3 (see Figure 1) is semi-circular. The wall 4 curves upwardly and forwardly as at 6, see Figures 1 and 2, and mergesinto the portion I of the wall 3. The wall 4 is provided with transversely spaced horizontal sockets 8, each slidably receiving a rearwardly extending bar 9. Each bar slidably passes through a pair of longitudinally spaced sockets respectively indicated I2 and I3. 'Ihe bars 9 are fixed in the sockets I2 and I3, and set screws I5 are provided one for each socket 8 to adjustably secure the rods to allow for belt tightening adjustments lengthwise of the machine as hereinafter more fully described.

vThe .plate I at the rear has transversely spaced and axially aligned supporting rollers 2l) acting as fulcra, the rollers being suitably journaled in depending legs 2| of plate or section I. The upright wall 3 is provided with a transverse bearing 23 which extends at opposite sides of the plate, as shown. This bearing has an outerk 55 bushing 24 in which are placed bushings 25. In bushings 25 is journaled a shaft 21 having a pulley 28 connected by belt 29 to pulley 30 of shaft 3l of an electric motor 32 suitably, preferably adjustably, mounted on` the section I. This motor may be of any preferred form but includes the usual. starting winding or windings, and means is provided for signaling the operator for the purpose of indicating that this starting Winding is in danger as a result of slowing down of the motor, by too great a pressure on the abrading roll.

The machine is provided at the opposite or rear lside of the roller-fulcra with a control extension 35 by which the degree of frictional contact pressure between the abrading means, later to be described, and the surface to be abraded is controlled. The circuit connections for operating the motor include therein a signal,in this instance an electric bulb 3&6, having a suitable cover 31, all attached to a casing 38 connected by elements 39 to the motor 32.

Referring to Figure 3, the control extension 35 is hollow and through it pass wires 46 leading from the casing 38 to a switch box 4I at the upper end of the extension 35, to which box are suitably attached handles 42', see Figure 5. The switch handle is indicated at 43 and the service cable is indicated at 44 and is provided with the usual plug 45. Neither the details of the switch nor of the wiring are shown, since they are well known and are not claimed per se herein.

The element 35 is adjustably lpivotally attached, as best shown in Figure 3, by means of a conical extension 46 rotatably tting a corresponding transversely extending opening in lug 41 of rear section I. This pivoting is at the rear of the frame and at that side-of the fulcra wheels 20 opposite the side on which the motor and the front section with its abrading means are arranged. The extension 46 has passing therethrough a bolt 48 which is threaded to receive nut 49 controlled by lever 50, in turn controlling a friction and expansion ring 5I interposed as shown and slidably connected with slots 52 of the conical extension 46. By rotation of the lever 5D in direction of the arrow, Figure 1, the extension 46 is non-rotatably fixed in its adjusted position.

Referring again to Figure 3: The shaft 21 has suitably keyed thereto what is referred to `herein as an outboard spindle 60, so arranged as to permit easy introduction and removal of a hollow-cored abrasive device described below. This spindle is attached by a hub 6I which is part of a division plate 62 located intermediately of the ends of the spindle.

The hollow cored abrasive means to be supported on the spindle for rotation thereby may comprise steel wool 1I as in Figures 1 and 3 or brush bristles 10 as in Figures 6 and '7. Securing means for detachably locking the abrasive means to the spindle is employed which is of such character that the abrasive means will be located in predetermined position lengthwise of the spindle, and which is so designed that different length abrasive means can be used on the same spindle.

As shown in Figures 1, 3 and 6 the abrading means includes a cylindrical tubular base member 65 which telescopically fits over the cylindrical spindle 60. The detachable securing means which serves to lock the abrasive means on the spindle includes diametrically relating bayonet slots 63 leading inwardly from the outer periphery of the spindle and located at the end thereof removed from the upright wall 3, see Figures -1 and 3. The cylindrical shell or drum which constitutes the base member 65 of the abrasive means/comprises elements detachably interlocking with the spindle slots. In Figures 1, 3 and 6 such means includes a single rod 66 extending diametrically of the base member 65. In Figure 6 the rod 66BL is placed at the midpoint lengthwise or axially of the shell or drum 65 at substantially equal distances from the opposite ends of such member. Through this arrangement, and because the bayonet slots are located at one end of the spindle 60 the base member 65 will be supported on the spindle with one end projecting therebeyond. Where as shown in Figure 6 the base member is substantially twice the length of the spindle, approximately one-half the length of the base member willy telescopically engage the spindle.

By positioning the rod 66a at about the midpoint axially of the base member 65, it will be evident that the abrasive means will be supported in corresponding position lengthwise of the spindle which ever end of the base member is applied over the spindle. This provides for reversibility of the abrasive means. on the spindle, and accordingly the abrasive means may be caused to rotate in either direction in relation to its operating' surface interchangeably taking any given direction of rotation of the power driven spindle. This feature is particularly useful where the abrasive means comprises a bristle brush as in Figures 6 and 7. Thus where the brush has been rotated for a period in one direction so that the bristles have been bent over to a flattened or less eiective position as illustrated in Figure 8, the brush may be quickly removed and reversed end to end on the spindle so that the bristles incline in the direction of rotation as shown in Figure 9, and through further operation can be brought back to effective position as shown in Figure 10. The effective life of the brush can be prolonged in this manner.

Where as in Figure 7 the base member 65a of the abrasive means is somewhat longer than twice the length of the spindle, it is important to prevent the innermost end ofthe abrasive means from coming in contact with parts of the casing of the machine and to maintain such end in the same relative position to the inner end 60 of the spindle, as in the'construction of Figure 6. To this end diametrically extending rod 68 will be slightly offset from the lengthwise midpoint of base member 65B. To provide for reversal, a second rod 69 is provided equally offset in the opposite direction from the midpoint of the base member which will interlock with the bayonet slots 63 at the end of the spindle when the other end of the member is applied over the spindle. By locating the rods 68 and 69 at equal distances from the respective ends of the spindle in only slightly spaced relation to each other and adjacent the midpoint, it will be evident that base member 65 may be reversibly supported on the Yspindle in the same relative position lengthwise thereof.

Referring to Figures 1, 3 and 6: It is noted that the use of the bayonet slot connection for the rod 66e, for example, in Figure 3, requires such a direction of rotation of the outboard spindle as will cause the ends walls 63a of the slots to remain engaged with the rod. As shown in Figure .1, the direction of this rotation is counterclockwise. It is an object herein not only to so rotate the outboard spindle as to cause this connection to be maintained, but also to rotate it so that steel wool Il which has been spirally wound about the drum 65 as in Figures 1 and 3 will not be unwound but will, 11

' action.

anything, be tightened as a result of abrasive This arrangement has relation, of course, to the direction of the winding of the steel wool material to produce the abrasive roll, and, in Figure 1, the dotted line and arrows thereon represent the direction of travel of the web as it is being wound on the roll, and it will be noted that in this gure, the direction of rotation in winding and in use, is counterclockwise as indicated by the arrow A. This dualpurpose uni-directional rotation is a feature of the invention, and of course is related to the character of the detachable locking means by which the drums or shells or 65 are attached to the outboard spindle 60. If the direction of the slots is reversed and the relation of the direction of winding to the direction of spindle rotation is maintained, as above described, the rotation of the spindle may be such as to assist in moving the machine forwardly, and it is intended to so operate. As shown inFigure 1, the direction of rotation of the abrading roll at point of contact with the oor or surface is opposite to that of the direction of travel of the machine.

A dust hood or cover for the spindle and steel wool roll or brush is provided, this cover being generally indicated at 'l5 and being, of course, open at the bottom. 'The cover, see Figure 3, only a portion of which is shown, is provided with a circumferential shoulder 16 which ts corre sponding shoulder 'I1 of the elements 6 and 'l and the cover 15, see Figure 1, is provided with a bolt 18 passing through an opening 19 of the plate element 4. A wing nut 80 is threaded on the bolt as shown. It will be understood that long covers are provided when long brushes or abrasive elements are used as best shown in Figures 6 and 7. A plate 82, see Figures 3 and 1, is held by screws 83, as shown in Figure 3, and this plate is cut out as at 84 to partly surround the inner end of the spindle as shown.

Features of the invention include the abrasive drum locking means and the connection of the abrading drum and rotation of the spindle in such direction as to prevent unlocking detachment of the drum-securing means from the spindle and such as to cause the wool to be wound more tightly on the drum while abrasive action Vof the wool on the surface to be abraded is taking place; the

provision of a connection for the abrading roll by which it can be reversed, particularly for use with a brush, for prolonging the life of the brush; and all details of construction, along with the broader ideas of means inherent in the disclosure.

We claim as our invention:

1. In combination with a rotatable supporting drum having diametrically related slots adjacent one end thereof leading inwardly from the outer periphery, a cylindrical shell as the base of a brush having bristles, said shell tting over said drum and projecting beyond the slotted end oi the drum a diametrically related rod detachably interlocking with said slots and secured to the shell at a point substantially midway between the shell ends so as to be capable of such interlocking and adapted to support the shell in substantially the same location on the drum whatever end of the shell is tted over the drum during assembly, whereby the shell can be removed and reversed end for end and again operably attached to the drum so that upon rotation of the drum in' the same direction bristles which have been bent in one direction to flattened and less eiective position are reversely bent and brought to a more eil'ective position during continued abrasive action, thereby prolonging the lite of the brush.

.2. In combination with a rotary cylindrical supporting member having diametrically related bayonet slots extending inwardly from one end, a rotary surface treating member having a tubular base removably fitting over the supporting member and being reversibly mountable thereon with either end of the base overlying the supporting member, a pair of diametrically extending locking rods each adapted to interlock with said slots of the supporting member, said rods being secured to the base in axially spaced relation at substantially equal distances on opposite sides oi' the mid point of the base member so that the base member is mountable on the supporting member reversibly, with either end of the base member overlying the supporting member, in substantially the same operative position lengthwise of the supporting member.

3. In combination with a cylindrical supporting member, a rotary polishing brush having a cylindrical tubular base removably tted over the supporting member, means respectively carried by said supporting member and base cooperating to detachably secure the latter to the former, said securing means on the base being located about midway of its axial length and the axial length of the base being about twice that of the axial length of the supporting member, said securing means on the supporting member being located adjacent one end thereof so that the base will be supported with one base end adjacent the opposite end of the supporting member from that carrying said securing means and with the other base end projecting beyond the supporting member end which carries said securing means.

4. In combination with a hollow drum having at one edge a pair of diametrically related oppositely directed bayonet slots, a rotary polishing brush having a tubular base removably tted over said drum and having a diametrically related rod disposed about midway of its axial length and detachably engaged with said slots in such manner that rotation in one direction tends to maintain the connection, the overall length of the base being substantially twice that of the overall length of the drum, and one end of the brush projecting beyond that end of the drum at which the connecting means is located.

5. A drum rotatably mounted, and having at one end thereof a pair of diametrically related inwardly extending slots, a surfacing member having a base which removably iits the drum and which has an axial length substantially twice that of the drum, said base having a diametrically related bar located about midway of its ends and adapted to enter said slots and hold the base against rotation on the drum with one end of the base adjacent one end of the drum and the othmer end of the base projecting beyond the other end of the drum.

6. A device for reversibly securing to a rotary support having a cylindrical surface a rotary surface treating member of greater length than the support, comprising a cylindrical tubular base for the surface treating member of greater length than the support telescopically tting `the cylindrical surface of the support and having opposite ends each capable of being applied over the supover the support and being adapted to similarly secure the surface member in substantially the same lengthwise position when the surfacing member is reversed and the other end of the tubular base is applied over the support.

EDWARD MCM. PENNOK. EARL E. PRICE.-

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