US1968215A

US1968215A - Tool for cleaning commutators and the like

Info

Publication number: US1968215A
Application number: US705686A
Authority: US
Inventors: Norris F Mcnaught; Edward H Peterson
Original assignee: Duro Metal Products Co
Current assignee: Duro Metal Products Co
Priority date: 1934-01-08
Filing date: 1934-01-08
Publication date: 1934-07-31
Anticipated expiration: 1951-07-31

Description

July 31, 1934. N4; F.'l-y/|NAUGHT r-:r AL 1,958,215

TOOL FOR CLEANING COMMUATOR AND THE LIKE Filed Jan. 8, 1934 Patented July 31, 1934 TOOL FOR CLEANING COMlVIUTATOR/S AND THE LIKE Norris F. McNaught and Edward H. Peterson, Chicago, Ill., assignors to Duro Metal Products Company, Chicago, Ill., a corporation of Illinois Application January s, 1934, serial No. 705,686

6 Claims.

Our invention contemplates and provides a handy tool which yis peculiarly suitable for cleaning and/or removing rough spots from the Vcommutators of dynamo-electric machines, but which is nevertheless capable of and intended for use in cleaning and smoothing contact rings,` distributor points, breaker contacts, fe'tcl The tool of our invention, as illustrated in the accompanying drawng, comprises an elongated pointer or cleaner arm, preferably constituted by a metal strap which isconformed at one end portion to provide a handle-eye for receiving, carrying andy dispensinga supply of abrasive strip to lbeV extended along theupper and lower surfaces of the pointer and around the tip thereof; that end portion of the metal strap whichis conformed to provide the handle eye also being conformed V`to provide a clamping arm which overlies the adjacent portion ofthe pointer and cooperates with an appropriate shackle to clamp a tautene'd abrasive strip to the upper, and lower surfacesof that portion of the pointer whichis embraced by the shackle. ,i

. The invention-has for its objects to provide a tool of the class mentioned which is of simple construction, comprises a minimum of parts, and which is economical to manufacture and easy to manipulate. v Y n y 'Other features, objects and advantagesof-our invention will appear from the followingdetailed descriptionv wherein reference is made to the accompanying drawing, in which Fig. l is aitopplan View of a preferred `emu bodiment of our invention;

Fig. 2 is aside elevational view of the tool illustrating how it maybe manipulated toi-effect the cleaning of the segments of avcommutator;

Fig. '3 is' a fragmentary sectional view taken on the line 3 3 of Fig. 1 and looking in the direction indicated by the arrows;

Fig. 4 is a view generally similar to'Fig.l 3,`but illustrating the parts of the tool in the relative positions which they assume when the clamping shackle is moved to its non-wedging position;

Fig. 5 is a view generally similar to Figs. 3 and 4 illustrating how the clamping shackle may be Withdrawn .from its embrace of the pointer vand clamping arm of the tool when there isv no abrasive strip on the pointer; I

Fig. 6 is a perspective illustrating the abrasive roll andclamping shackle disassociated from the other parts of the tool; and

Fig. '7 illustrates a modiedform of clamping shackle which may b e employed if desired'.

Similar charactersof reference refer to similar parts throughout the several views.

We shall rst refer to Figs. l to 6, inclusive.

An initially flat and resilient metal strap is conformed to provide a pointer or cleaner varm 25, 50

a vhandle-eye 26, and a relatively short clamping arm 2'7.` The clamping arm 27 is arranged to lie at an acute angle to the adjacent portion of the pointer 25, even when the said clamping arm is released from the shackle vindicated at 28. Y

In some instances the tip of the pointer 25y is curved slightly away from the plane of the rest of the pointer and is there given a permanent set, as indicated `at 29. The tip of the clamping arm is turned away from the pointer, as indicated at 30, and is there given a permanent 'set to serve as a stop for the clamping shackle 28.

` The clamping shackle 28 conveniently consists of a generally rectangular metal stamping provided with a rectangular opening 3l.y The longer dimension of opening 31 is somewhat greater than the width of the strap from which the pointer 25, handle-eye 26, and clamping arm 27 are formed.

The'shorter dimension of the opening 31 is such S0 that when the shackle'is embracing the pointer 25 and clamping arm 27, the upper margin of said opening will'barely clear the tip of the clamping arm offset 30, providing there lis no abrasive strip carried bythe pointer, and provided further that 35 the clamping arm is pressed tightly against the adjacent portion of the pointer, as illustrated in Fig. 5,. There is no occasion for removing shackle clamp 28 from its embrace of the pointer 25 and clampingrarm 27 after the original assemblyof 90 the tool parts has been made. v

Indicated at 32 is a roll of a suitable flexible abrading strip. The abrading strip may be formed of cloth, paper or other suitable flexible material, and is preferably provided on but one of its faces with any suitable abrasive such as sand, emery, carborundum, ground glass, or the like. The abrading strip preferably has the same width as the metal lstrap from which the pointer 25, handle-eye 26 and clamping arm 27 are 100 formed, and is preferably coiled with its abrading face turned inwardly. The abrading strip coil being coreless, it, uncoils itself as the strip is progressed outwardly with the result that the outer convolution of the coil exerts a radial force against ther inner wall of the eye 26 and thereby maintains a certain frictional engagement between the outer convolution and the eye, which tends to hold the coil against axial displacement from the open faced eye. The strip is pulled out 4embrace of the clamping 65 when the clamping arm 27 is in its released position of Fig. 4, and for that position the coil will have uncoiled itself sufficiently to exert a pressure against the inner wall of the eye. When the strip is clamped in place by sliding the ring 28 to the position of Fig. 3, the eye is somewhat contracted after the manner of a. band brake about the coil. This clamping action further holds the coil against lateral displacement.

With the clamping shackle 28 moved to the non-wedging position illustrated in Fig, 4, the roll 32 is placed in the handle-eye 26, and the free end of the abrading strip is led from the roll between the pointer 25 andclainping arm 27, and is passed through the clamping shackle 28. The strip is then drawn 4over the upper surface of the pointer, around its tip, and thence along the lower surface of the pointer toward the handle-eye 28, being again passed through the clamping shackle 23, as illustrated in Figs. ll to 4.

The shackle clamp 28 is then moved from the position shown in Fig, 4. to or toward the position `shown in the preceding gures. When this movement of the shackle clamp occurs, the Lipper margin of the shacklecl'amp opening 31 cooperates with thev upper surface of the clamping arm 27 to move the clamping arm toward the adjacent portion of the pointer 25 securelyto clampthe abrasive strip where it passes between the point and the upturned extremityl of the clampingY arm. At the same time, the lower margin of the shackley clamp aperture 3 1 `firmly engages the lower run ofthe .abrasive kstrip .and draws such strip tightlyover the upper and lower faces of the pointer, and clamps itin such taut condition. .The tool isnow readyor use. Y

By grasping the handle-eye 26, the user .may

manipulate the abrasive carrying ,pointer to clean and/or smooth the. segments ofthe oommutator 33 1of.a. dynamo-electric machine which is vmore `or less diagrammatically illustrated at 34.v During this cleaningand/ oiismoothing operation, the remainder "of the Adynamo-electric machine, including the commutator, is rotated eithermanu- ,allyor under vpower, as preferred. The tool ,of

the'present invention similarly may be, utilized to -clean and/or smooth distributor contacts, inter- .the p.ointer,. and the shackle. clampfis then V,re-

turned to the wedging positionzindicatedin Figs. luto 3. The replaced or wornportion of the `abrasive .strip .is then removed, -conveniently by tearingit along and against the lower margin of the shackle clamp opening 31.

M While we prefer Vto form .the .shackle clamp of stamped metal, as illustrated. inFigs, L to.,6

inclusive, this. shackle clamp may be formedfr'om asinglepiece I,ofstif wire having the conformation shownlin Fig. 7.

, Having thus illustrated and described f our 1invention in. a preferredembodiment thereof, what we claim as new .and desire to secure by Letters Patent of the United States, isp..

l, Ina tool of the. c lassdescribed a. ,metal straphaving 'gi'je'ater` width .than thickness, said strap being conformed to provide an elongated poi nter,.,az handle-eye and av clamping f arm, said clamping arm being angularly z disposed with relation to the pointer4 at ,a point adjacent the handle end of the latter, a shackle clamp embracing said pointer and clamping arm to hold upon the pointer a flexible abrasive strip which has been extended from said handle-eye alongside and around the tip of the pointer, the tip of said clamping arm being turned away from the pointer to serve as a stop .for s aid shackle clamp substantially as described.

2. An abrasive tool comprising a holder including a, supporting arm, an open faced eye, a

'clamping arm overlying the supporting arm ad jacent the eye, the clamping arm being supported by the eye, and means for locking the clamping arm against the supporting arm, and a strip of abrasive material arranged as a coreless coil within the eye andexpanded against the inner surface of the eye, the strip extending outwardly fromthe Vcoil and passing between the clamping arm and the supporting arm and along and about the opposite end of the supporting arm.

3. An abrasive tool comprising a single length of resilient metal strap bent in a, plane perpendicular to its width to form a long 4 iivork-, ei'rigagirig arm, a short clamping arm overlying theinner endof the working arm `a t a slight longitudinal inclination thereto and a Q- shaped portionforming an open faced eye, the ends o f theo-shaped portion continuing into the innerfends of -the respective arms, a corelessisupply rolll'offabrasive strip storedwithin the'eye tending toexp'and against, and thereby fri ctionallyY retaining the roll against axial .displacement within the eye, the outer convolution ofthe roll extending outwardly from the eye between the eye 'ari-ris and in, clampable relation therebetween -and continuingalong the one side of the long arm; around ,the end thereof, and back along theotli'er side thereof to va position beneathsthe shortar'in'and 'a ciampinsring embracing the t'w'p arms anja the superposed reaches of the strip 'and `working against theinclination of the s'hor't'armto'clainp the two'reaches ofthe'strip against'tlie long 4. An abrasive tool lcori'prisiga holder 'including a supporting arm, an Aopen faced eye, a

Eriti clamping 'arnji overlying `the 'supporting Varm adjacent the eye, thewclanipirg arm 'being silp- 1ported by the eye, and Vnie'a'ri's yfor Al'ocki'rfg'the clamping arm against 'the supportiiigfarmQanda strip of abrasive material arranged'a'sa 'crele's's coil within lthe eye v'and expanded "against -the inner surface of the eye, the 'strip extending "outwardly from the coilmand passing between 'the clamping arm and the supp'ortih'garm andalon'g and about the opposite 'end of 'the' supporting arm, said clamping means 'being -applied 'to the clamping arm'betweenfthe region of contact of the clamping arm withthe abrasive strip andthe connection between the Y('l'arnpiri'g 'ar-rn and the eye, whereby 'the "application vof said clamping 4means to operate the clamping'arin also slightly contracts the eye upon thecih..

v5. An "abrasive strip holder comprising; a. rneta1 .strap bent in aplane perpendicular to Eitswidth into ashape formingan .eyey the ends ,of t he eye extending, in the samezdirection in Aspaced relation into an integral supporting a r1`r1 .and Ac lampingarm respectively, the eye adapted to receive a coilv of abrasive strip, the.outerf,cbnvo lution of vwhich'extendsoutwardly'betwe'en the Vposed arms, and ano'fsetf in .the outer end of the Clamping arm turnedjaway 1-0m the;"sup DOIhg arm and of such dimension "as'to'per'mit "iso embracing the superposed arms for clamping them together, the eye being adapted to receive a coil of abrasive' strip, the outer convolution of which extends outwardly between the superposed arms in clampable relation thereto and along the respective sides of the supporting arm and. about the outer end. thereof, the clamping arm, when released by the shackle, being supported. and positioned in relation to the supporting arm solely by the eye through the arcuate length thereof.

NORRIS F. MCNAUGHT. EDWARD H. PETERSON.