US 654861 A
Description (OCR text may contain errors)
No. 654,861. Patented luly 3|, |900.
J. J. TYNAN. Y BORING TOUL.
(Application led Aug. 7, 1899.) (No Modal.) 2 Sheets-Sheet l.
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lo. s54,a6|. Patented my. 3|, |900.
J. J. TYNAN.
(Application led Aug. 7, 1899.) (un Model.) 2 sheets-sheet 2.
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UNirD' STATES PATENT OFFICE.
VJOSEPH J. TYNAN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR, BY MESNE ASSIGNMENTIO THE PNEUMATIO TOOL IMPROVEMENT COMPANY, OF SAME PLAOEAND ACAMD'EN, NEW JERSEY.
srncrrrcarroiv forming part or Lettestratent No. 654,861, dated Jgiy 31, ieo. Application illed August 7, 18.99. Serial Ifo-726,405I (No model.)
To al?, wwnt it may concern:y i i Be it knownl that I,"JOSEPH J. .T'YNAI a citizen of the United States, residing in the city and county of Philadelphia, in the State of Pennsylvania, have invented certain new and useful Improvements in Boring-Tools', of which the following is a specification.
My invention relates to a class of implements employed to cut boltholes and similar apertures, usually of considerable depth, into or through masses of wood, especially such as compose parts of the inner skins, decks, and girders of vessels.
It is the object of my invention to provide a simple and compact yet very efficient iin-A plement of this character capable of doing' better and quicker work than such devices as have heretofore been employed for the pur# of the disk, and the plane of the guide edge,
In the accompanying drawings I show andA herein I describe, a good form of a conven-` ter, the head being diagrammatically indi-Il cated. e
Figure 5 is a central, vertical, sectional,
elevation of the device, section being sup# posed on the line 5 5 of Figure 4,1.
Figure 6 is'a view in perspectiveof myim-4 gustment.`
proved cutter head.
Figure 7 is a view 1n vertical, sectional,i
elevation of the cutter head, the cutter shaft,
a handle, and a supporting and guiding mechanism employed in connection with the cutter shaft. i
Similar letters of reference indicate corre-rl y i one portion andthe other upon the remaining spending parts.
In the drawings, A is thev cutter shaft upon the threaded outer extremity of which is mounted a shank O'of the cutter head B.
headv The head B consists conveniently of a disk like body carried by and conveniently integral with respect to the shank C, said head being provided with a pair of cutter slots b extending respectively from opposing edges of the head t-angentially inward for such distance as may be necessary according to the breadth of the cutters employed.
The upper face of the cutter head is fashioned to provide inclines or bit seats, which respectively extend each from an edge of a cutter slot upward for any desired distance,
. and, preferably as shown in the drawings, to
the edge of the disk like body of the head, the inner edge of each incline being dened by a vertical wall or rib b', the body of which from top to bottoni .is `conveniently of the full normal thickness or vertical dimensions b2, of which is tangentially disposed'with respect to the'shank` C. r
The inclines are, therefore, in plan, semisegmental, so to speak. Y D E are cutters, bits or knives, each approximately of semi-segmental outline corresponding to the plan of the inclines, and each mounted upon an incline with its cutting i edge protruding through the adjacent slot vand below the plane of the lower face of the bodyof the head.
When in this position the inner edges of the cutters abut against the guide edges b2, and the curved edges of said cutters approXimately coincide with the curved outer face of l the cutter head.
F F are screws which pass through suitable slots in the cutters and down into the substance `of the cutter head, and which serve to secure the cutters in different positions of adr The cutter D and the cutter E, in the revolution ofmthe head, togetherl cutor operate upon a circular zone or space equal in breadth to the breadth of one of said cutter`s,"s`aid jcutters being provided with apportioned cutp. ting edges, so that4 one cutter operates upon portion of the circular space or zone to be cut.
t With such object in view the cutting end ofthe cutter E is provided with the two cutting portions e at the respective sideportions IOO of the other cutter.
The cutters are of suchform and arrangement that vertical planes coinciding with shank'of the cutter head, with the 4result that as said cutters are swept aroundthe circle they-describe in the operation of the implement, they present an inclined edge, so to speak, tc the masses of wood or material they encounter, so that they effect a drawingY cut upon the wood or material, the operation of the apparatus being thereby rendered proportionately easier.
G isa recessor slot formed in 'the outer edge of the head in the region b', said slot having an undercut wall g, (Figure 3.)
H is a knife haft having a pair of inclined side edges, which haft is seated within said recess with one of its inclined edges extendsvl ing beneath the edge g, said haft terminating at itslower end in a knife h (Figure 2) which projects below the plane of the lower face of the head.
J isa holding block with an inclined edge, y mountedin the recess G, and extending across the remaining space thereof from the edge of' the haft to the edge of the recess, the edge of said block overhanging the'adjacent edge of the haft.
Screws secure said holding block in position, and, through said holding block firmly lock the knife and knife haft against lateral displacement.
K isa screw entered in a suitably tapped opening in the upper face of the cutter head. and so located that the head of said screw presents against the upper end of the knife haft, the arrangement being such that by. the adjustment of said screw in its tapped opening saidknife may be set at any desired position, of vertical adjustment.
In the operation of cutter heads of this general character where the cutter blades operate at an angle of only about forty-five degrees from the horizon, against a surface which is itself approximately horizontal, and particularly when operating upon aA fibrous material such as wood, the tendency is to form a hole the side of which. will, owing to the tearing of the bers, be pitted or uneven.
VAs will be understood, however, by the provisionof the auxiliary knife H, located Vat the outer edge of the' cutter head, and with its cutting edge disposed vertically with respect to the planev of the surface operated upon by the cutters D E, not only -will the liole f v cut by the instrument be rendered smoothbut tation.
Y it, the cu't splinterspassingu p over the upper faces of the cutters; thereis Vno provision ordinarily in the use of cutters ofthis general type for the separation of the masses of wood excavated by the inclined cutters from the block operated upon along a line coinciding with the boundary of the hole formed, so that the material excavated ,by the inclined cuttheir cutting edges aretangential to the ters is merely torn, so'to speak by the outer ends ofi-the cutting'ed'ges from .the body of thematerial acted upon.
The auxiliary knife H, however; cutting throughthe materialoperated upon, upon a line coinciding with the outline of thecutter head, separates the material to be cutinto and excavated by the cuttersD E, from the body of the timber-operated upon, and thereby, by the substitution of the cutting actionof said auxiliary knifek for the tearingaction which must take place in the absence of said knife,
renders more easy theoperation of .the tool and occasions the formation of at smooth hole instead of a ragged one. Y
The vertically disposed knife mounted on the periphery of the cutting head is of special utility in connection with the arrangement.
of cutters hereinbefore described, inasmuch as one of said cutters has a blankY space or recess at t-he outer portionof its cutting edge, and therefore there is a greater tendency on the part of the inclined cutters, (in the'absence IOO of the vertically disposedknife) to fail, by
reason of such recess,.to form a smooth and cleanly cut hole. l
Manifestly the arrangement of inclined cutters disclosed, having .alternatef cutting portions or recesses and blank spaces the cutting portions of one blade acting upon portions passed over by the blank spaces of the. other blade, constitutes an improvement upon cut# ter blades as heretofore formed and arranged.
In cutters of thisgeneral character as heretofore arranged one blade is apt to project below the other and do all the. cutting, the other simplyfollowingin its path and remain- IIO . ing idle, the strain coming therefore on one part of the tool, at one side of its axis of rc- In my improved cutter each'blade takes its own portion of the work, theY strain isfdistributed equally on both sides of the instrument and the device operates more smoothly and uniformly. Y
`In order to provide for the entrance of the tool within the substance and as aguide for its operation, I provide an auger bit L, Figure 5, which I mount in the manner shown or in any preferred manner within themouth of the shank C.
This is my preferred expedient.. If. I so desire I may resort to` a substitute `for this expedient, such las is shown in Figure 7,
namelya x'ed guide S in the center of a previously formed hole of diameter equal to the shank C, which guide extendsV up within the hollow interior of the cutter shaft.
I prefer however in some cases to employ the auger bit L shown in Figure 5 for the reason that in its use no previously formed hole is necessary.
The cutter shaft A is shown, as provided with a sleeve M mounted for rotation within one arm of a frame elbow N, said sleeve being secured to the shaft by a set screw m which passes through it into a key seat in the cutter shaft and also through a collar M mounted upon the lower end of said sleeve. The upper end of said sleeve is provided with a bevel gear M.
The bevel gear and collar confine the sleeve in place within the bore of the frame elbow.
O is a driving shaft in communication, through any desired means, with a source of power, which shaft extends through the other arm of the frame elbow and is equipped as to its inner end with a bevel O in mesh with the bevel gear rst mentioned.
P is a collar, mounted and secured on said shaft O, which with the gear O maintains said shaft against longitudinal movement with respect to the frame elbow.
By the arrangement described the frame elbow, carrying the cutter shaft and head, may be rotated with respect to the shaft O,
and said cutter head carried to different positions in a plane perpendicular to said shaft O, or, said frame elbow, carrying the shaft O, fnay be rotated upon the sleeve M to carry the outer end of the shaft O to whatever position within its range of move-ment, may be most convenient to connect it with a source of power. The apparatus may, therefore, be veryconveniently employed in corners and places difficult of access with boring implements of ordinary construction.
To advance the cutter shaft and head, I provide the shaft with a handle Q connected to its outer endby a swivel consisting of a screw q the outer unthreaded portion of which passes through an unthreaded opening in the handle and the inner threaded portion of which engages in a tapped opening in the end of the shaft.
The portion of the handle which presents toward the shaft is shown as formed as a fiat operating face Q and the outer end of the shaft as recessed to form a ballrace R within which are a series of balls R' which ease the friction between the handle and the shaft in the rapid revolution of the latter.
Having thus described my invention, I
claim and desire to. secure by Letters Pat= ent- 1. A cutter for boring cylindrical holes, consisting of a disk head having approximately radial slots, symmetrical bit seats formed by inclines leading to said slots, each at its lower portion of the width of the circumferential path or area operated upon by the bits, cutters orbits mounted on the inclines and presenting through said slots and conforming to the seats in dimensions, each bit being as to its front edge provided with ,a blank space and a cutting edge, the cutting edge of one bit arranged to operate upon the regionpassed over by the blank space of the other, and the cutting edges of said bits being straight, substantially as set forth.
t 2. A cutter for boring cylindrical holes, con
ters or bits mounted on the inclines and pre senting through said slots and conforming to the seats in dimensions, each bit being as to its front edge provided with a blank space and a cutting edge, the cutting edge of one bit arranged to operate upon the region passed over by the blank space of the other, the cutting edges of said bits being straight, and a vertically disposed cutting knife mounted upon the periphery ofthe disk head and proj ecting below the lower face of the same, substantially as set forth.
3. A cutter for boring cylindrical holes, consisting of a disk head having approximately radial slots, symmetrical bit seats formed by inclines leading to said slots, each at its lower portion of the width of the circumferential path or area operated upon by the bits, cutters or bits mounted on the inclines and pre senting through said slots and conforming to the seats in dimensions, each bit being as to its front edge provided with a blank space and a cutting edge, the cuttingy edge of one bit arranged to operate upon the region passed over by the blank space of the other, the cutting edges of said bits being straight, and a` vertically disposed cutting knife adj ustably mounted upon the periphery of the disk head and projecting below the lower face of the same, substantially asset forth.
In testimony that I claim the foregoing as