US 1871674 A
Description (OCR text may contain errors)
ug- 16, 1932 c. D. ELLITHORPE m METAL REFINISHER Filed Sept. 50, 1930 2 Sheetsheet l Aug. 156, w32@ c. D. ELLWHQRPE METAL REFINISHER Sheets-Sheet 2 Filed sept. so, 1930 MMIII n Patented Aug.Y 16, 1932 ldarsi ENCE ' CLARENCE D. ELLITHCEPE, or srEINGErELE GARDENS, LONG ISLAND, NEW YORK, As-
sIGNoE To DUPLEX ELECTRIC COMPANY, or NEW YORK, N. Y., AV CoEPoEA'rroN OF DELAWARE METAL EEEINrsHEE j This invention relates to a 'portable' electric machine and particularly one which is adapted to be manipulated by the hand and A used for polishing and grinding and similar I uses.
One of the principal objects of this invention is to provide a portable electric machine vwhich is light and durably constructed and which may be readily carried in one hand.
Another object of this invention is to provide a portable electric machine which is pro- 20 the motor may be moved along the fiat surface without contacting the polishingy or grinding parts and may be tipped on the bevelled edge into contact with the work to be surfaced so that the surfacing may be more closely governed.
Another object of this inventon is to provide a portable surfacing machine which is provided with convenient operating finger tipped control which may be operated by either hand, permitting the other hand to steady or hold the work. Y
Another object of this invention is to provide a portable electric motor which is easily handled by one hand and which may be provided with a pistol grip so that it can be operated as a drill or similar device. Another object of this invention is to provide a portable motor having a low speed operating-shaft driven by a high speed small motor which may be adapted to receive a flexible shaft or may be operated by the pistol grip as a drill or may be used as a polishing and grinding device on its bevelled base which facilitates accurate control. Further objects land advantages of this invention will appearY from the following description thereof taken in connection with the attached drawings which illustrate preferred forms of embodiment to which my invention i5@ is susceptible and in which Application filed September 30, 1930. Serial No. A485,376.V
Figure 1 is a side elevation of the portable machine showing the manner by which it is handled. l
Figure 2 is a side elevation of the machine shown in Figure l showing the machine tipped on the bevelled nose.
Figure 3 is a front elevation of the machine shown in Figure 1.
Figure 4: is a vertical section substantially on the lines .t-lof Figure 3.
Figure 5 is a horizontal section substantially on the line 5-5 of Figure 1.
Figure 6 is a rear elevation with parts broken away to show t-he internal construction. Y
Figure 7 is a detail view of a modified form of driving mechanism.
rlhe portable machine shown in Figure 1 comprises the motor casing 10 having the general shape of a flat iron having the base 12 on which the motor 14e shown in Figure l is mounted. A countershaft 16 extends from the front of the casing and is adapted to receive a rotatable tool 18 which will be rapidly rotated by the action of the motor `14. A strap 20 extends above the casing 10 and is secured to the casing 10 by means of projecting buttons 22 which cooperate with adjustable holes 24am the strap. The strap is adapted to pass over the wrist of the operator and the iingerof the operator will grasp projecting ridges or finger grips 26 along the sides of the casing and better shown in Figure 3. As the strap -is supported by the rearmost part of the casing V1() and as the finger grips 26 extend along the forward part of the casing it will be found that the machine can' vbe veryy easily carried and manipulated by one hand of the operator and can be carried in either hand with equal facility. 'f
The base 12 is provided with an upturned orbevelled nose 12a which in the normal position spacesthe tool 18 above the surface of the work.V When pressure of the tool on the work is desired a slight movement of the operators wrist will raise the strap and Vthus the rear end of the casing to depress the shaftend as will be seen in Figure 2. In this position considerable working effect is had Ymay be readily varied.
and the pressure of the tool 18 on the Work The angle is relatively small and the bevel is adjacent the front end of the base. As the remainder of the base is flat the machine is easily moved along an extensive vfiat surface Without :fatigue andWitha uniform result. of Work. a buffer or other tool is used, however, it
will be understood that themachine will be -19 :is-mounted on suitable rubber strips or cushions 21 s o tliatthemotor maybe held in ,e zvibrationless :but secure position. The inside of theniotor base 1 2-is shown in Eig.- .5 ,and there are .upstanding .projections 2`to1Whchthe easing loissecuredfby means of screws or bolts 25. A toggle switch 27-is mountedfon themose fol'rtop offthefront of the polisher casing in position-tome .operated by .the forefnger offeiiherhand ott-he op- 4erator .to control the motor which ris electri- 1 .eallyeneigi-Zed through the Wires28, and
switoh lWires v (not Shown).
The oountershaft 16 .is `preferably tapped at 1.6.4z t leoeivea bolt 29 Whiehsecures the .work wheel 18 to the oountersha-ft 16. yIt
Willbeunderstood thatthebolt`29is provided 4with threads reversed-to the inatural rotational Yn1@vement of theeountershafft so fthat the wheel wllnotcorne off..
Thefmotor easing l0 is .also prordedfwith @plurality ofholes Onfthefrear faceefthe .Casing and -With e'plurality lof other holes ,Eil in the frontof y.the easing for the fpurpose of ventilation. Affen 32 isemounted inside o f the motorcasing and @Hille LHQQI AShaftlhe fanA 32 thus revolvesiat high Speedl drawing air Atheme11 the rear `Qrinlet lholes 30 in the Casing 11.0 thencethroughthemotor oase and thenceout through :the outlet holes 3f1. i'llhe .fan advantageously cools thezmotol and high speed Without overheating.
ln operation, .the operator will slip his hand under the strap and grasp thecasing adjacent the -nger 1g-'rips thus having a -irm andsecure hold on the polsherfcasing. In the ycommon usage .of this 'polished particularlyion vault walls, a very largefflat sur, yitee .can fbe Ypolished 'With lease and conveni- `ence `and-1in many .instances ,Where from -the nature lo f -theworlnaspecial :equipment would otherwise be required such as with ay special graining or striping of common vault Walls Which have been grained, the motor may be tipped on the bevel edge and the spots on the Wall and which must be removed can be `effectivelygroundout;and the surface refnished. W'ith the 'present polisher and .,refinisher, it is possible for theoperator to .slide .the .motor `valong Athe surface of the vault Wall and'byirstus'ing asutalolegrnding compound and appropriate 'brushes he canremove the spots and then with a change of worlrtool and the use of a suitable polishingandibuiing Wheel, it is possible to restore the surface to its normal condition. Nornia-ily the ylorush 4.or toolris of insuiiicientdiame-ter :to kcon-tact .directly -with the .Work while :the ipolisher,isY being fslid along :the surface and thus accidental-cutting is :avoided. The tipping of the motor brings about the results'desired. f
.Theiingergrip ledges permitzthetmachine to beheld by `one ihandrthus making it possible to. use -thetotherzhandxto steadyxthe rivoik.
The motor :may be controlled 4 by a limited fao movement of the index finger and fthe toggle switch is placed in a.,convenient.and readily accessible position which .iis appropriate :to the `fingers ongeither hand.
As shown-in Figures land 2, alpis-tol grip handle 35 havingcorrugations 3610 engage the fiingers :maybe mountedona studz .on theextremeend ofthe casing 10. Asuita'ble nut 38 zisadapted :to tighten the pistol grip 3'5 and valso permits .relative rotation .of the pistol grip aboutthe-.studi-BT. The'pi'stol grip isfsometimes desirablewherefthe-fmotorrisused in an inaccessible -positionand'wheniit is .inL convenient to s upportrthe ymotor by thel strap 20. It may also be used when additional -force l-is :requiredito -force fthe .Work tool into VContact with Athe Work to be cleaned. The handlemayfbe removed or rotated about l.the stud 37 as desired. 1
As .shown .in A'Iligure 77, the `motor :may'be used as a source of power for arflexibleshaft 4Q `and handoperated tool .46. The `flexible Vshaft 40 -is :providedfwith'a securing bracket 42 Nvhichfismounted `on I'the 'front end fof the housing 10'by means of the screw L44. yThe power shaftis provided iwith a-sorewrthread ed i end 45 which engages and-screws into the tapped end -lwof-thesha-ft 16. A man'- ually controlled Ahandle 46 Amay be provided Vforthe worlrfendof the shaft y40 and the Work tool 118 -maybe secured to' the end of the `flexible shaft in any Well yknown manner.
Withsuch a construction it isalso possible and convenient to 'han`dle they Apolisher Aand casing in one hand "with the (finger adjacent the .;controlling''toggle switch 27 and leave 'the other ihandfr'ee to manipulatefthehandle 46 adjacent :the worlratool. Thisftool'fmay be va buffer,l grinder, brush .or idrillfor .other device and due to the lgearing, sufiioienttorque is available to operate such devices. A1- though the device is particularly desirable for purposes of cleaning and restoring the original grained finish of vault doors leaving the door with the original bright appearance, it is also equally as Well adapted for buf'ting or polishing flat or round surfaces and with the extension shaft is adapted to reach otherwise inaccessible places with the same convenience as when carried in the hand.
The polisher is light, compact, and sturdy and easily carried on the wrist for long periods without fatigue. The strap on the rear of the casing gives good leverage to enable the motor to be raised onto the bevel thus forcing the work tool into contact with the surface to be relinished. Various tools may be used as the nature of the work requires and for inaccessible places or drilling, the exible shaft is highly eiicient.
While I have shown a preferred form of embodiment of my device, I am aware that other modifi-cations may be made thereto and I therefore desire a broad interpretation of this invention within the scope and spirit of the description thereof and the claim appended hereinafter.
A portable tool of the class described comprising a flat iron shaped casing having a forwardly bevelled base, a motor in said casing, a motor shaft projecting from the front endof said casing, gripping ledges along each side of said casing, a supporting member mounted on the rear of the casing, means to ventilate said motor comprising a fan on the motor shaft and Ventilating openings in said casing, and a toggle switch adjacent the front of said casing adapted to be manipulated by the operators finger, said supporting member extending over the operators hand whereby said tool may be tipped on said beveled base and a pistol grip to facilitate such movement. Y
In testimony whereof I have aifixed my signature to this specication.
CLARENCE D. ELLITHORPE.