US2493226A

US2493226A - Portable power-driven file

Info

Publication number: US2493226A
Application number: US713691A
Authority: US
Inventors: Frank A Cole
Original assignee: Individual
Current assignee: Individual
Priority date: 1946-12-03
Filing date: 1946-12-03
Publication date: 1950-01-03
Anticipated expiration: 1967-01-03

Description

Jan. 3, 1950 F. A. COLE PORTABLE POWER-DRIVER FILE Filed Dec.- 3, 1946 E :m J 6 4 JT a am 90. \5

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Patented Jan. 3, 1950 UNITED STATES PATENT OFFICE Claims.

This invention relates to a metal-surfacing apparatus in the nature of a file or smoother and, in particular, to a portable device having a driving motor associated therewith.

It is frequently desirable in the metal-working arts to smooth the surface of a member after it has been worked on. Hand ling is commonly resorted to for this purpose but it is a slow and costly operation and is characterized by lack of I have invented a portable power-driven tool capable of smoothing metal surfaces uniformly and rapidly, which is practically as simple to operate as an ordinary file but is capable of performing a surfacing operation much more efficiently and satisfactorily. In a preferred embodiment of the invention, an open-bottomed housing is provided with a horizontal cross wall above the bottom thereof sloping downwardly at each end forming gudeways. A yoke is slidable along each guideway. A plurality of toothed blades extend between the yokes, each blade being secured to one yoke and slidable on the other, the toothed edges of the blades being exposed at the open bottom of the housing. A shaft is journaled in the housing and is adapted to be driven by a motor mounted thereon. Barrel cams on the shaft cause reciprocation of the yokes and blades on rotation of the shaft. Lifter plates extend along the blades and are mounted for vertical movement relative to the housing whereby to lift the apparatus on the retraction stroke of the blades, Disc cams on the shaft cause reciprocation of the lifter plates in timed relation to the reciprocation of the toothed blades.

A complete understanding of the invention may be obtained from the following detailed description and explanation referring to the accompanying drawings for the purpose ofillustration. In the drawings,

Figure 1 is a vertical longitudinal section through the apparatus showing parts in elevation;

Figure 2 is a bottom plan view with parts broken away and parts omitted for the sake of clearness; and

Figures 3 and 4 are transverse sections on the planes of lines IlI--III and IV-IV, respectively, of Figure 1 looking in opposite directions.

Referring in detail to the drawings, an openbottomed housing I0 rectangular in plan has side walls II, end walls I2 and top I3. A cross wall I4 extending between the ends and sides is located intermediate the bottom and top of the housing and is secured therein in any convenient manner as by welding. The end portions of the wall are plane and slope downwardly forming guideways I5. Yokes I6 and I'I are slidable along the under surface of the guideways.

A plurality of toothed blades I8 extend between the yokes I6 and I1. Alternate blades are secured to one yoke and slidable on the other. Each blade has holes at one end for bolts I9 inserted through the spaced depending sides of yoke Il and a slot at the other end for sliding on similar bolts on the yoke I6, or vice versa. The teeth on alternate blades are oppositely directed so that a cutting stroke is effected when the blades are pulled toward the ends of the housing A shaft 20 is journaled longitudinally of the housing I0 in bearings 2| in the ends of the housing and bearings 22 on the Wall I4. The shaft is driven by a motor 23 which may conveniently be mounted on the top I3 of the housing. A worm 24 on the motor shaft meshes with a worrnwheel 25 on the shaft 20 between the bearings '22. Frusto-conical barrel cams 2B are secured to the shaft 2E) for reciprocating the yokes I6 and I'I. Each cam has a circumferential slot 21 adapted to accommodate the ball head of an actuator 28 extending upwardly from one of the yokes through a slot 29 in the sloping end portion or guideway of the wall I4. It will be apparent that, by reason of the slope of the guideways, the blades will be forced downwardly as they are moved toward the ends of the housing. The tool, being bodily manipulated by hand, is free to rise, of course, as the blades advance but the reaction of the weight of the tool urges the blades against the work. To facilitate manipulating the tool, the motor 23 may conveniently be mounted in a bracket 30 having a hand grip 3l provided with a trigger switch 32 for controlling the motor.

In order to raise the tool and the toothed edges of the blades I8 from the surface being worked on as the blades are retracted, i. e., pushed toward the center of the housing, I provide a plurality of lifter plates 33 extending alongside the toothed blades and between adjacent blades. The plates 33 are secured at their upper edges to a horizontal plate 34. The lower edges of the plates 33 are adapted to bear on the surface of the work. Guide pins 35 extend upwardly from the plate 34 through bearings 3B in the wall I4. The pins 35 are urged against disc cams 31 on the shaft 20 by compression springs 38 surrounding the bearings for the guide pins and engaging flanges 39 thereon. The springs 38 urge the non-creeping.

plates 33 and 34 upwardly at all times. The cams 31 are so shaped and positioned on the shaft 20 as to move the plates 33 and 34 downwardly while the yokes I6 and I1 are being moved inwardly to retract the blades to a position for starting a cutting stroke. When the blades have reached this position, the cam permits the springs 38 to raise the plates 33 and 34, thereby lowering the housing so that the toothed edges of the blades engage the work. It will thus be apparent that the housing l vibrates vertically during the operation of the device.

Certain of the blades I8, specifically those designated |8a, extend beyond the ends of the other blades and outwardly through a slot 40 in one end of the housing. The projecting portions of these blades may be used in the manner of a saw for rough cutting or ripping operations.

It will be apparent that the invention lprovides a portable power-driven machine for smoothing .metal surf aces which is characterizedy by numerous advantages. In the `:first place, the apparatus 3 is relatively simple and inexpensive to manufacture. .Its .'use,v furthermoregdoes not require any special skill. The actionof the cutting blades is quickand accurate. All moving parts'are enclosed except the toothed edges of the blades.

Sinceialternate'z blades are reciprocated in opposite'directions'and vthus'have their teeth facing in opposite directions, thexdevice as a whole'is The dust vand chips resulting from the smoothing operation are fed out freely because. the cutting'blades are lifted clear o-f the .workfon the retraction stroke. On the cutting stroke, the weight of the tool, as explained above, serves'fto apply the necessary working pressure to the blades.

Although I have illustrated-.and described only a preferred embodimentof the invention, it will be recognizedthat changesin the construction disclosed may be'made'without departing .from

`the spiritiof the 'invention or the scope of the appended claims. Instead of using individual -cutting blades vassembled in two cooperating groups, the individual blades of which are interleaved, the blades of eachgroup may be formed Yby slotting a block; the `block being secured .to one of the yokes. Instead ofmounting the driving motoren the housing, furthermore, I may drive the shaftil throughr a flexible shaft' from :alternate ones of said blades' having. their respective teeth directed in opposite directions, all

f of said-blades having their respective teeth directed in one direction comprising one group and all of the remaining of `said blades comprising another group, a yoke attached tov each -of said groups of said blades having their teeth respecf tively directed in the same direction, means for ymoving said yokes apart substantially parallel Ito the length of said blades to effect a simultanemous lineal' cutting stroke in opposite directions, Y whereby said portable powerdriven' fileV is sub- -fstantially non-creeping during' operation.

2. In a portable power-driven lile for smoothing metal surfaces or the like, in combination, a plurality of toothed blades in parallel arrangement adapted to form a substantially planar toothed filing surface, alternate ones of said blades having their teeth oppositely and respectively directed axially thereof, a yoke attached to each group of said blades having their teeth directed in the same direction, means for moving said yokes `apart substantially parallel to said toothed surface and to the longitudinal axes of said blades to effect a simultaneous cutting stroke .n opposite directions, said means for moving `be ing further adapted to move said yokes toward each other to effect a simultaneous linear retraction stroke of said blades, an independent lifting Vsurface-for said yokes, and means for extending said lifting surface while said yokes are vbeing so moved toward each other, whereby all of said blades are maintained in relatively sharp condition by being'kept out of contact with said metal surfacesorthe like'duringsaid retraction stroke.

3. In a portablepower-.driven ille for'smoothing metal surfaces and the llike,.in combination, a plurality of toothed'bladesfset on edge in parallel arrangement and adapted to form asubstantially planarv toothed: ling surface, adjoining blades of said plurality having their teeth oppositely directed along the longitudinal axes of said respective blades, a yoke attached toeachgroup of said blades .having their. teethidirected in the same direction, each said yoke having sliding engagement with the group of said blades having f 'their teeth directed in the opposite direction, said toward each other at the same rate substantially parallel to said toothed surface and to said longitudinal axesrofsaid blades to effect a simultaneous linear retraction stroke of said blades, whereby simultaneous respective cutting and retraction movement of all blades occurs in linear opposed equal force fashion to prevent creeping forces during operation, each of said blades being supportably engaged by said yokes at spaced 1 points along the length thereof.

4. In a portable power-driven le for smooth- :ing metal surfaces or the like, in combination, a plurality of toothed bladesset on edge in parallel arrangement and adapted to. form Va substantially planar toothed vfiling surface, vadjoining blades of said plurality having their teeth oppositely directed. along .the longitudinal axes of said respective blades, a yoke attached to each group of said blades having their teeth directed in the same direction, each said yoke-having sliding engagement with thegrOllP 0f Said-blades having their teeth directed in the-opposite direction, means for simultaneously moving said-yokes apart at the same rate substantially parallel lto said toothed. surface and to said longitudinal axes of said blades to effect a simultaneous linear cutting stroke in oppositefdirectionsagainst said :metal surfaces or the like, means for simultaneously moving said yokes toward each other at i the same rate substantially parallel I'to 'i said toothed surface and-toV said longitudinal axes of said blades to effect a simultaneous linear retraction stroke of said blades, lifting plates positioned on edge between said blades and adapted to be reciprocated vertically, means for moving said lifting plates against said metal surfaces or the like during said linear retraction stroke of said blades to lift said blades off of said metal surfaces or the like during retraction, whereby said portable power-driven iile is substantially non-creeping during operation and said yokes maintain said blades in planar relation to said metal surfaces or the like.

5. In a portable power-driven le for smoothing metal surfaces or the like, in combination, a plurality of toothed blades set on edge in parallel arrangement and adapted to form a substantially planar toothed filing surface, adjoining blades of said plurality having their teeth oppositely directed along the longitudinal axes of said respective blades, a yoke attached to each group of said blades having their teeth directed in the same direction, each said yoke having slotted engagement with the group of said blades having their teeth directed in the opposite direction, said slotted engagement being spaced from the point of attachment between said group and its respective yoke, cams for simultaneously moving said yokes apart at the same rate substantially parallel to said toothed surface and to said longitudinal axes of said blades to effect a simultaneous linear cutting stroke in opposite directions against said metal surfaces or the like, downwardly and outwardly sloping guideways for said yokes adapted to move said blades toward said metal surfaces or the like during said cutting stroke, said cams being further adapted to simultaneously move said yokes toward each other at the same rate substantially parallel to said toothed surface and to said longitudinal axes of said blades to eifect a simultaneous linear retraction stroke of said blades in opposite directions, lifting plates positioned on edge between said blades and adapted to be reciprocated vertically, cam means for moving said lifting plates against said metal surfaces and the like during said linear retraction stroke of said blades to lift said blades away from said metal surfaces and the like during retraction, whereby said portable power-driven le is substantially non-creeping during operation and said blades are maintained in relatively sharp condition by being lifted during said retraction stroke.

FRANK A. COLE.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,025,754 Little May 7, 1912 1,437,190 Oxley Nov. 28, 1922 1,856,887 Scheppy May 3, 1932 1,871,020 Wyzenbeek Aug. 9, 1932 1,993,797 Peterson Mar. 12, 1935 2,103,444 Bauch Dec. 28, 1937 2,123,426 Kehle July l2, 1938 FOREIGN PATENTS Number Country Date 560,035 France June 28, 1923