US2378838A - Burnishing tool - Google Patents

Description

June 19, 1945. *I A. E. COMISTOCKl BURNISHING TOOL Filed Oct. 5, 1942 I N VE N TOR ghz/IQ 1528. c ,g

Y ATTORNEYS.

Patented June 19, 1945 y UNITED STATES l'nN PATENTMIOFFNICE n'. l n A2.a:7as3s n f l,

n `BURNI'SHING 'rooL Aifrea'E. Comstock, Detroit, Mich.; assigner to The Murray Corporation ofAmerica, Detroit,

Mich., a corporation of Delaware Application October5, 1942, Serial No; 460,883

` n 7 claims. r(Giza-90) This invention relates to burnishing tools, and particularly to altool for1 burnishing the scratch marks `which may be present in a surface of a sheet of material. I

In the copending applications of R. D. I

applicationsemploy a segmental spherical tipv driven in rotation and moved along the scratch marks to iron the niietal atlthe sides of the mark into the` bases of e mark and into abutted relation to close and seal the mark. The Haberstump application includes friction wheels which prevent any oscillating movement from being transmitted from the burnishing tip to the tool proper and which guides the tool along the scratch mark. A lubricating roller is employed adjacent to the tip for lubricatingthe metal of the scratch mark and also the tip to prevent the wearing of the tip and the over-Working and tearing of the metal. The tearing of the metal also occurs when too great a pressure is applied to the tool for forcing the tool into contact with the metal to be burnished.

The present invention pertains to the use of a spring-pressed burnishing tip by which the amount of pressure applied between the` tip and the surface of the sheet is regulated Stops are provided on the wheel bracket which prevents the spring from becoming solid. A predetermined spring pressure is always applied between the tip and the metal to be burnished `and theoverworking of the metal through the application of too much pressure is thereby overcome. The invention also pertains to the use of an oil wick directly adjacent to the burnishing tip for con-- nished; to mount the stem of a burnishing tip` in a sleeve having a slot in which a pin in the stem projects for securing the stem within the sleeve while permitting limited movement against p a spring provided in the sleeve; to provide a lubricating wick directly adjacent to the burnishing tip for lubricating the area of engagement i between the tip and neral being burnished.; and

in general, to provide a burnishing tool. which is positive in operation andweconomical of manu-` facture. I M. i

Other objects and features of novelty ofthe invention `will be either specically pointed out or will become 'apparent when referring,` for a better understanding. ofthe invention, to Vthe following description taken fin `conjunction with the accompanying` drawing, wherein: .I i

Figure l is a View in elevation of a burnishing tool, illustrating features of` this inventionwith` i Fig. 3 is a broken Iview of structure similar to and,

Fig. 4 is an enlarged sectional View 0f the struc-` Fig. 2, taken on the line 2`2 4thereof..`

ture illustrated in The burnishing tool of the Vpresent invention is employed primarily for burnishing scratch marks which are present on the `surfacel of the Alclad sheets. i 'I'Ihese aresheetsnmade of aluminum alloy having a.` layer .of4 `pure aluminum thereon. The aluminum prevents `deterioration and Oxidation of the core portion and. when scratches .are made on the face of the sheet the core metal is exposed. Y The tip of thepresent tool is mounted Vinert-center relation to the driving shank for the purpose `of working the metal ateach side of the mark into the base .ofthe mark and into sealed relationwith eachother.

The tool embodies the motor portion I Il, the

driven chuck or collet II in which thetool I2 is secured. A bracket I3 is securedto the `housing of the motor portion by a cap I4 and bolts I5. `A wheel supporting bracket is secured by a shaft Il to the bracket I3 and is provided with tabs I8 `which abut against the bracket I3 to limit the `ure 1.

Between the arms 26 of the bracket I9 a tubuwhich it is securedk by a nut 3l.

from' being: directlyk applied to the?, tip 36';

y39 urges the stem outwardly of the sleeve. and

provides a predetermined pressure on the.. tip. to

regulate the force of contact with thesurfacefbeing burnished.

When a scratchmark in a: sheet-.41 isy to be burnished, the wheels 24 are disposed equi-dis-e tant on'each side of the mark and the motor portion;` Ifilis moved; downwardly to; havefthei tip:

36 contact' theamarlr.y Thefstop` tabs Ij8'I contact the bracketv I3, asfiillustrated'ini Figure 3f, and limit the downward movement of the driving portion I I." of the tool tof prevent'.1thet pressure The maximum'. pressure on' the tip. will bef* that exerted by: the spring: 39T.` which will? be sufficient tov produce theT bumishing'operation without unduly working the-metal being' burnished. The wick 32? will?, be disposed" directly adjacent tothe tip wiien=the1 tip contacts. the surface,` as'iillustrated in Figure 3*, and will? lubricatet the! metah and tip as the burnishing operation progresses.l

The flow of:v air'througli.I the conductor 42i oiy the motor portion I of the too'risontrolled'by the pivoted' armst 43" which actuates a plunger v'of/acontrol valve, (notfshown). Aistheeccentric' tip 3'6 is rapidly" rotated onthe center line of the scratch mark the wheels '24 stabilize the devicefandi guide thex tipV as the device is moved? backward and* f ofrwardly along: they mark; The wheels limit the downward movement ofthe tip-tof preventthe direct; applicationiof pressure thereto.

What* is claimed is: y

1. burnishing toolf` including a tip havingM a segmental spherical endf portion and a shank portion; the axis off the end portion being oii'set from that diA the` shank portion whichl passes through theend portion,` a sleeve supportingsaid shank` portion', andi a spring urging said shank portion outwardly* of" the sleeve, and means for driving said shank in rotation.

2-. 1`n azdevice for'burni'shi-ng the surfacev of'a materialfin'cluding, irr combination, a drivenelement,` aA burnislu'ng' toolsupported by said' element; s aid'.' tool embodying; a burnishingf tip-4 havinglimited outwardS movement, a spring for urging" saidtip downwardly; aI bracket, a wheel supporting arm on said bracket, a wheel on said arm, and stop means for limiting the movement of the wheel supporting arm on said bracket for 3. In a burnishing tool, a drivingl portion, a

portion driven in rotationotherebyl, a burnishing toolsupported by said driveni portionvhaving a shank and a burnishng tip axially offset from the shank which is of less diameterthan said tip,.a spring-pressed Wheel disposed adjacent to saidl burnishing tip, and a tubular element containing a lubricant and a wick supported adjacentto said wheel;4

, 4;,111. a` burnishing device, a driving portion, a driven portion, a burnishing tool rotated by said' driven portion, said burnishing tool having a burnishing tip, the axis of which is oiiset from the axis of rotation of said driven portion, a bracket anA arm; pivotedv on; said bracket-a1 wheel supported onsaid; bracket son as to be; disposed below-r the tip of said burnishing to o1,. andr a tubular element supported by said arm; containing a; lubricant; and a: wicky alignedv with said; tip andl disposed adjacent;A thereto'. when the; tip, is movedidownwardly relative'topzsaid?wheels to be in :contact with-the surface to be burnished.-

5; Inra burnishingd'evice; a driving portion, adriveni portion; a: tool supported by said driven portion comprising a: tubular element in which theishankof: a burnishing tipzisl secured for limite'd movement when, urged; outwardly of the sleeve. by' a spring,` a bracket supported onzsaid device; avspring-pressed wheel disposed adjacent tov saidti'p, a spring for: urging saidwheel belowssaidn tip, anda stop element'forlimiting the upward movement of said Wheel' relative tosaid tip'.A to preventv the application of the applied pressure directlyrto said? tip.

6. a burnishing tool', adriven portion, a portion for'driving said-1 driven portion in rotation, a spring-pressed" tiprotated" by said driven portion with theI axis of' the tip in off-center relation tou the axisA off thedriven portion which latter axis fall'sjwithin the tip; and means `for limiting the downward movement of said tip when'.` contacting the-surface of a sheet of metal to be burnished;

'7; In an burnishing tool, a driven portion, a portion for driving said driven portion in rotation, aspring-pressed tiprotated by-said driven portion with the aX-is ofthe tip in off-center relation `to theaxisA of the driven portion, means forlimiting--the downwardmovement of said tip when contacting the surface of a sheet of metal to beburnished, and' awick containing-a lubricant disposed adjacent to said tip when contacting said'surface.

ALFRED COMSTOCK.

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