US2102841A - Wheel truing device - Google Patents

Description

WHEEL TRUING DEVICE Filed Aug. 24, 1935 2 Sheets-Sheet 1 Wifneas I fivenzor Dec.21,1937. Rw FULLER 2,102,841

WHEEL TRUING DEVI CE Filed Aug. 24, 1955 2 Sheets-Shet 2 Patented Dec. 21, 1937 UNITED STATES.

PATEN OFFICE Production Machine Company, Greenfield, Mess? a p erefis Ma achu tt Application August 24,

1.935, Serial No. 37,793

Claims. (01. 125 -1 1) The present invention relates to a' wheel truing device for grinding and polishing wheels and is designed more particularly for use on that type of machine in which the space available for the 5 tr-uing device is restricted. as, for example, in certain types of machines employing a belt feed for rotating and feeding :the Work. 1

it is an object a; the invention to provide a truing device which may be permanently attached to the machine, but which will be completely out of the way of the operator .or the work when not in use.

It is a further object to provide .a construction which permits the device to be positively and rigidly locked in position when the truing opera tion is being performed, thus eliminating any chattering of the tooland thereby .securing a more uniform and exact Wheel surface.

A further object of the invention is to provide a construction which-will inno way interfere with the changing of wheels either to a different size .or to .aJdifierent type or material, and ,inyvhich various typesof tools may be used interchange- {30 .erative position .on the wheel casing, the dotted *lines-representingthe device thrown back on the casing in inoperative position; Fig. 2 is an, end view of the device Fig. 3 is asideelevation, ona reduced scale, of a polishing machine vof wellknown -,ma.nu aetu e. w t he t uinadevice on the wheel casing, showing the mechanism for moving the wheel toward and away from the truing device; Fig. A: is a pe'rspectiye ylew of the tool {holder ,with a tool or stick .of abrasive ma- ,40 teria th isev ra p r s e salie' ie b t pgrated in order to illustrate more clearly their stmeiien an relation; L-Ei 51 1a l i e ano}; s owin a too holder 'fP ho fi ee a knife to tr m n slo poli hin whee 'a $5 a plan View of the knife used .in the holder. of

Fig. 5; Fig. 7 is a side elevation of aftool'iholder i am nd i wp sa 7 The truin g device com prises, generally speakto 3mm to o n ai p ri l wm n e upon the hood or io ther fixed portion of the machine. wh inofl n use t e- 3 n h e -r11 b tapped 1-9. swun P ck u 2 th in use the arm and tool are positi 5 a e tlxed aputm ntasaies rial such as carborundum is tobeiisedf oi tru'ing also has thet im ul boss. r exile fa e n the a m i r gid y c emp dwab}? @2 iust ng an ed dev ces are provided for bringing the tool and wheel surface proper relative position and causing the tool to operate acros th ace o l he'wh e 5 he wins dei' fi .e he d awing qgmpr'ises an arm I l pivotally mounted "on the hood or ca s;- ing 13 f e po i in whee :hymeans of sum s ait I c r ed by l gs 1.9 wh h m y be formed as an integral part of the wheel hood. Thehq s h sn a utment 1; W t a ree??- ed stud 23 projecting from the face thereof. when e t a ns de ce i n Qp r i Pos tion. a conta t fac n th arm bear-. .again abutmen T ar s held r gidly ag a ut en b m an of a in e nally P sleeve tfi'f r e en t lqw end of th pindle 21 which is slidingly and rotatably mounted in the am t A and rip or wheel 29 onf upper end ,oI the pin le afi rqs a niee means for rotating the spindleand sleeve to ;clamp the arm ,fixedly in position. slidingly mounted n the -vetfie.. e a a th front or free end of the arm -,l t e toql 'holdn carriage .33. Thi ismove e p'n th 'fg'uid way'toieed the tool aQlOSS the face of the grinding or polishing wheel bymeans of the feed 34 and hand whee 35- S u n a inc ined t a sverse bor n t carria eb th clamp ng bolts at is the gyl ind rj cal sha k 3; o t-.1 tqol ho er ountin o hos 1-39 w ch in ture i Pro de w a b l l and clamping bolt {H tor thetool holder proper. ,As shown in Figs, {1, 5,7, ands; the holder comprises a cylindrical'men berjm adapted to be ,secured in the bo re' of j the mo ting" or fpo's] 39 landto l holding orifclaznn ps .1 ans o f rm adap ed to t e art ul r pe pi i q'p emplo ed. Thus inthe Ordinary type 'of wooden wheel with abrasive coating'where a v stick of 'abras amatethe wheel, 'thelholdefwillbe as showniin' 'Fig. 4 wherein the cylih'dricahmember 33- is provided with an abutment piece'45 having" the shoulder 4! to engage the face ofthe' abrasive stick 149, a cap piece'or clampingmemberjl lbeing tightly clamped against the other two faces of ;the1stick by the clamping bolt 53 which passes throu h slot 55 in the cap piece and entersithethreaded hole-5.1 in the abutment memhe f f eucap pi 5,0 is formed with the clamping faces 59, and shgnld rs .61, .for engagemen wit he st A? Lan contact .wi e ;fa ce of the ,abu me t s ihatwlle pant ar tl ni edteeeigeaa p55 firmer contact and more even distribution of pressure will result and there will be less liability of fracture of the stick.

The bodily movement of the wheel l5 within the hood l3 to bring the wheel into proper enagement with the truing tool is obtained by mounting the wheel shaft 65 in bearings in the upper end of lever 61 pivoted at 69 and having the downwardly and forwardly inclined extension or arm II. By means of the hand wheel 13 and the screw shaft 15 suitably connected to the end of the extension, the lever 61 may be adjusted about its pivot 69 to the desired position for' the proper operation of the truing tools or devices.

The main driving pulley 11 being co-axial with the pivot of the wheel carrying lever, the tension of the driving belt 19 is unaffected by such adjusting movement of lever and wheel. A belt tightener comprising the idler pulley 8| mounted on arm 83 also pivoted at 69 with slot 85 and bolt 81 affords means for adjusting the driving belt tension.

For trimming cloth wheels, the holder illustrated in Fig. 5 is used with a round nose knife 89, as shown in Fig. 6, which is retained in the slot 9| by set screws 93.

After a cloth wheel has been used for some time, it becomes matted down. To rake out the wheel so that it may be made serviceable for further use, it is customary to use a wooden stick with protruding nails, held in the hand of the operator. The holder and tool of Figs. '7 and 8 are adapted to rake out cloth wheels, eliminating the danger present when a hand-held rake is used. U-shaped teeth 95 are inserted in holes in the extension 91 on the holder, and held securely by set screws 99. Y

The operation of the truing device when applied to a machine of the type shown in the drawings, is as follows:

In normal operation of the machine, i. e., when it is grinding or polishing the work presented to it, the truing device will be swung or tipped backwardly into the position shown in dotted outline in Fig. 1, where it can in no way interfere with the view or manipulations of the operator or the grinding operation of the machine.

When it is desired to true the grinding or polishing wheel, the truing device will be tipped forwardly, until its contact face engages the abutment 2|, and the threaded socket 25 on the spindle 21 registers with the fixed threaded stud 23 projecting from the abutment 2| on wheel hood, the spindle being raised at this time in its bearing in the arm II. On rotation of the hand wheel 29, the threaded socket 25 will be screwed down on the stud 23 until the arm ll carrying bring the abrasive stick into proper position, the

parts being secured by the tightening of the clamping bolts 36 and 4|.

In order to bring the polishing wheel and truing tool into proper relative position, the wheel will be adjusted forwardly or backwardly, as the case may be, by means of the screw shaft 15 and hand wheel 13, thereby swinging the wheel support lever 6'! about its pivot 69 to bring the hand wheel 13 of the screw shaft 15.

- After the truing of the Wheel has been completed, the truing" device will be released by reversing the rotation of the threaded sleeve and spindle 25 and 21, and the whole device turned backwardly into its original dotted line position in Fig. '1.

Wher the knife or rake is used in place of the abrasive stick the manipulations and operations will be exactly the same except as to the character of the truing action of the tool, the uneven surface of thecloth or felt wheel being cut away by the round nose knife 89 and the matted or hardened surface of the cloth wheel being loosened up by the rake teeth 95.

While it is not essential that the particular form of tool holder illustrated in Fig. 4 be used, this has been found most satisfactory in actual use, the arrangement of the clamping faces, shoulders and abutments not only resulting in the tool or abrasive stick being held firmly in fixed position, but the liability of fracture of the abrasive stick, present in other types of holder, is avoided.

Nor is the truing device as a Whole limited to the details of construction herein shown and described, as the form and arrangement of the various parts may be modified and varied without departing from the invention as set forth in the appended claims.

' 'Having thus described the invention, what is claimed is: a

1. A truing device for polishing wheels and the'like' comprising a guideway, a carriage on said guideway, means for moving the carriage on the guideway, and a tool holder on the carriage, the holder comprising an abutment member and a co-operating clamping member for supporting therebetween the truing tool, the abutment and clamping members each having tool engagingfaces at right angles to one another, the faces on one member being opposite the faces on the other member whereby the tool is clamped between opposite pairs of clamping faces.

2. A tool holder for polishing machines and the like, comprising an-abutment member having a plurality of clamping faces and a threaded opening, aclamping member having a plurality of clamping faces and a stop for engaging the abutment member, and a bolt passing through the clamping member between the clamping faces on one side and the stop'on the other and entering the threaded opening for clamping atool in position between the abutment and the clamping members, the stop on the clamping member preventing tilting of said member.

3. A tool holder for polishing machines and the like, comprising an abutment member, a clamping member having a plurality of spaced clamping faces, means laterally disposed with respect to the clamping faces for forcing the j members toward one another to clamp a tool therebetweengone of said members having provision for maintaining the members in proper angular relation.

7 4. In a. polishing machine or the like, the combination with a rotating wheel, a casing enclosing the wheel and provided with a clamping abutment and lug at the top and an opening for the presentation of the work in the front thereof, a truing device comprising an arm pivoted on the lug on an axis parallel to the axis of the wheel and having a clamping face for engagement with the abutment when the truing device is swung forwardly on its pivotal support, and a truing tool mounted on the arm, the tool being projected through the opening to engage the face of the wheel when the device is swung forwardly, the device being adapted to be swung rearwardly to rest upon the casing in inoperative position distant from said opening, and means for clamping the face on the arm in engagement with the abutment on the casing to hold the truing device in fixed operative position.

5. In a polishing machine or the like, the combination with a rotating wheel, of a circular casing enclosing the wheel and provided with a peripheral opening for the presentation of the work to the wheel, a truing device comprising an arm pivotally mounted at one end on the casing on an axis parallel to the axis of rotation of the wheel and a truing tool mounted at the other end of the arm, the pivot of the arm being positioned on the periphery of the casing to permit movement of the arm in the plane of rotation of the wheel to cause the tool to extend through the opening in the casing to engage the face of the wheel when the arm is swung forwardly into operative position, and to rest upon the periphery of the casing in the rear of the pivot when the arm is swung rearwardly the arm is swung forwardly, and means for rotating the sleeve while in engagement with the screw to draw the arm into operative position and said abutments into clamping engagement, thereby to position and fixedly secure the arm with relation to the wheel.

RUFUS W. FULLER.

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