US2357773A

US2357773A - Drill holder

Info

Publication number: US2357773A
Application number: US448281A
Authority: US
Inventors: Vincent A Sheskier
Original assignee: FARMINGDALE AIRCRAFTSMEN Manufacturing C
Current assignee: FARMINGDALE AIRCRAFTSMEN Manufacturing C; FARMINGDALE AIRCRAFTSMEN MANUFACTURING Corp
Priority date: 1942-06-24
Filing date: 1942-06-24
Publication date: 1944-09-05
Anticipated expiration: 1961-09-05

Description

DRILL HOLDER Filed June 24, 1942Y z 'lill/[111mm Patented Sept. 5, 1944 U N I TE D L STATES PATE-N Tv'. O'F'Fl C E.

DRILL HOLDER Vincent A. 4Sheskie, Farmingdale, N. vY., assignor.v t-o` Farmingdale'Aircraftsmen Manufactur ing Corporation, Farmingdale, N. Y.

Application June 24, 1.942, SerialNo. 448,281

. 3 Claims;

This invention relates ,to a drill. holder-and it is an object of the invention to providea device i of this kind including a handle member carrying a head rotatably supportingfa collet; and wherein means. `areprovided .for effectively .lubricating .the 5 collet .toassure keeping ,the head1cool at -alltimesl-v Itis alsoan-object of .theinvention to .provi-de l a holder-of thiskind-including a collet adaptedto detachably holda drilliso-thatupon breakage of .thepdrill or for; other reasons, such dri-ll .canil be readilyreplaced.y l

A .still further: object 'tot theinvention `is to provide. a holder of -this kind including a vcolletf* to receive a drill, said'collet Lbeing-provided withk meanswto permitV the drill to Dbe selectivelyad-- justed, whereby the length of the drill protruding from the collet may be adjusted to the exact.r depth-of .the hole to be drilled, thereby avoiding. the,.danger of drilling'through and having th'e'.;

drilllbecome unmanagealole.A

An additional object of the invention'is toipro-e vide a holderofwthis 'kindo a characterlwhiclr permits the drill to be setin a manner .to-cassure;v a trueI running hole, so that the hole .thatis drilled.; maintains a tolerance -ofznot more:than:.-1one-: thousandth of an inch.

A still further object of the invention-.is topro- .v vide.a holder of this-kind which .enables-tha: drilling of holes into small and otherwise inacces sible spots;

The invention has foran `additionalobject to provide a holder of this kind whichlprovides-foi the .vusetof` interchangeableicollets and wherein each of vsuch collets can abe" conveniently applied:

Figure/i is a detailed sectional View taken sub-Vv stantially on the line 4-4 of Figure 1.

Figure 5 is a sectionalfview taken longitudi nally through a second collet havinga bore of a A .diameter different from the bore of the collet shown. in Figures -1 to 4, and l- Figure 6 is a fragmentary elevational view, with a portionbroken away, illustratinga holder constructedin accordance withanother embodiment r of the invention.`

is preferably ofmetal -andihasa majorportion.

or removed without. necessitating displacement'- of- "35 the :drill with respect -ftothe colletif The vinvention lconsists in th'edetailsr` of con-W struction' and .in the combination .and'arrange mentfof the` several parts of my :drill `holder fwhe'rebylfcertain important advantages-are :at' tained, as will be hereinafter more fullyiset forth.`

In"`ordei that my invention-may bei better'une" derstood, I will now proceedltoidescribe thesame j 2 of its periphery knurled.

Forced intoione endportion of the bore 3 'of'- the handle member .I isfan..V elongated stem 4 radiatingffrom abearingphead 5, said stem-.4 and Y ,headY 5 beingpreferably.integral andrmade vof phosphor-bronze., .Y

The. bore 6 of the head-.5 is dispased axially I at right.. angles to v.the `axis ofthe stem A and` said stem 4 has disposed axially therethrough a lubricatingportl, one end of which-opens direct" into the. bore E of .thehead 5 and .the other end beingin open communication with 4the lbore 3 of the handle member .I I

The bore 3 of theihandle member ofV theappliedstemA provides a reservoir fora suitable lubricatinggrease or material, and-therouter end ofthe bore 3 has snugly-.tted therein Y a sleeve 8 into which threads vfrom without a" fitting 9 for .coupling with a suitable -grease gun or thev like .whereby lubricant; maybe forced up.V through thehandlemember. I and through the y port 'I intothebore of thefhead 5 to lubricate y with` vreference to the accompanying drawing,

the shaft Il) .of the appliedfcollet. Y

The shaft lis ota length substantially coextensive in length with the lengthofthe `bore 6 and the head. Il ofthe collet has an inner-'atv face I2 surrounding-the 'shaft Il] for contact with e an endof. thebearinghead 5 toV limit the extent. of insertion of the shaft:|0intothe bore '6 of the f head 5.

The shaft;l I0 and thefhead'l II-of` the'acollet C have disposed axially therethroughfa bore M Yin which is .snuglygand-freely inserted the'rear end* portion of a drill If5ii` This "drilll5'.isjadaiotedto` have its forward' or Workingend-portionprojected z. outwardlyin advance of the head I I ofthe collet C in accordance with the depth of the hole to be drilled and said drill I5 is effectively held or locked in its selected endwise adjusted position by theAllen'nuts I6 threading radially through I outwardly the head II of the collet C for binding contact with the inserted portion of the drill I5.

The end portion of the bore I4 of the collet C remote from the head is enlarged, as at I1, and threading into such enlarged portion II is an axial extension I8 carried by the inner face 20 of a tail-piece I9. This inner face 20 of the tail-piece is substantially flat and surrounds the extension I8 and has close contact with the adjacent or free end of the shaft I of the collet C. This tail-piece I9 is fixed to an end portionof a flexible shaft 2| for rotation therewith. This flexible shaft ZI is adapted to be suitably coupled to the chuck of a drill motor of any preferred type and which in itself forms no part of the present invention.

The extension I8 has disposed axially therethrough a bore 22 which is continued for a considerable distance within'the tail-piece I9 and, as is particularly illustrated in Figure 3 of the drawing, this bore 22 is of a material diameter so that the inserted end portions of drills of different sizes may be readily received therein in order to allow for the desired endwise adjustment of the drill I5.

In practice, it is the purpose to furnish with each of the handle members I a series of collets each of which has a bore therethrough in accordance with a particular size of drill. In Figure of the drawing is illustrated a collet C constructed substantially the same as the collet C except that the bore 23 thereof is of a diameter less than the diameter of thev bore I4 of the collet C. Also, in this form, the Allen screws are set in the shaft portion Iand will therefore be housed in head 5.

It is intended that witheach handle member I a set of at least five collets be supplied for use in connection with drills of different sizes and it is believed to be obvious that the diameter of the bore 22 of the tail-piece I9 is large enough to receive the inserted end portions of any one of such different drills, thus making it necessary only to use a single tail-piece I 9.

In the embodiment of the invention as illustrated in Figure 6, the general construction is the same as comprised in the rst embodiment except that the stem 24 of the bearing head 25 is angularly related with respect to the axis of the head 5 to permit the use of the holder in places which would not otherwiseY be accessible by the tool as comprised in the first embodiment.

In View of the foregoing it is believed to be obvious that the holder is of a type employing the use of interchangeable collets C and that in connection with each of such collets C the exl tended length of the applied drill I5 can be easily adjusted by proper manipulation of the Allen screws I6, such adjustment bein-g facilitated by the bore I8 in the tail-piece I9.

The head II of the collet C and the tail-piece I9 are provided with milled flats 26 so that the assembly of the collet and tail-piece one with respect to the other and with respect to the bearing head 5 may be facilitated by the use of wrenches. Such flats are also shown in the collet C', at 26. It is to be further and particularly pointed out that the major radius of the head I I of the collet C and of the tail-piece I9 is less than the mean radius of the bearing head 5, so

that the periphery of the head II and of the tail-piece I9 during a working operation will not touch the work and thus eliminate the damage which would otherwise occur.

It will also be noted that the Allen screws I'B do not protrude into the bore I4 of the collet C but merely touch the applied drill I5 and hold it from slipping in or out. This assures trueness in the hole that isA being drilled.

It is also to be emphasized that the bore I4 ofthe collet C is of the exact diameter as the end portion of the drill inserted therethrough. This further insures trueness in the hole that is being drilled on account of the elimination of any over-size in the bore I4 with respect to the drill I5.

From the foregoing description it is thought to be obvious that a drill holder constructed in accordance with my invention is particularly well adapted for use by reason of the convenience and facility with which it may be assembled and operated.

What lI claim is:

1 A drill holder comprising a tubularl handle member, a bearing head having a stem fitting within an end portion of the tubular handle, said bearing head having a cylindrical opening therethrough, the stem of the bearing head having an axially disposed port affording communication between the interior of the tubular handle and with the bore of the bearing head, said tubular handle constituting a reservoir for lubricant, a collet having a shaft tting between the bore of the bearing head, means for holding a drill to the collet, and means coupled to the outer end portion of the shaft of the collet for rotating the collet.

2. A drill holder comprising a bearing head having a cylindrical bore, a collet including a head and shaft, the shaft rotatably extending within the bore of the bearing head, said head and shaftl of the collet having a bore extending entirely and axially therethrough to freely receive an end portion of a drill, and a tail-piece engaged with the end portion of the shaft of the collet remote from the head of the collet, said tail-piece having a bore with which the bore of the collet communicates, said bore ofthe tail-piece being also adapted to receive the inserted end portion of the drill, said tail-piece providing means for coupling the shaft of the collet to a source of power for rotating the collet.

3. A drill holder, comprising a tubular handle member, a bearing head having a stem fitting within an end of the tubular handle, a collet having a reduced shaft forming an annular bearing shoulder, said shaft being rotatably fitted insaid bearing head and having the shoulder rotatably engaging the head, the shaft at its free end having an interiorly threaded socket, a tail-piece having a threaded stem adapted for engagement in said socket and having a shoulder at the inner end of this stem for turning engagement against the side of the bearing head opposite the first shoulder, means coupled with said tail piece facilitating the application of rotary power thereto and to the collet, and said collet having an axial bore for the reception of a drill.

VINCENT A. SHESKIER