US1152070A - Centering-tool. - Google Patents

Description

C. J. BORGESON.

CENTERING TOOL.

APPLICATION FILED AUG.6.1914.

1,152,070. Patented Aug. 31, 1915.

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C. J. BORGESON.

CENTERING TOOL.

APPLICATION FILED Aues. 1914.

1 1 52,070. Patented Aug. 31, 1915.

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UNITED STATES PATENT onnion.

CHARLES J. BORGESON, or SYRACUSE, NEW' YORK.

CENTERING-TOOL.

Specification of Letters Patent.

Application filed August 6, 1914. Serial N 0. 855,490.

To all whom it may concern Be it known that I, CHARLES J BoRsEsoN, a citizen of the United States, resldlng at Syracuse, in the county of Onondaga and State of New York, have invented certain new and useful Improvements in Centering- Tools, of which the following is a specification. A

The purpose of this tool is to rapidly and I the additional stock. If the center is placed with the applicants tool, a. minimum amount of stock is necessary. The advantage of this device is the perfect centering of a shaft or round piece of metal, and saving of material and labor.

One embodiment of the present invention is illustrated in the accompanying drawings, in which z Figure 1 shows an elevation of the center- 'ing tool; Fig. 2, a longitudinal section along line 22 of Fig. 4; Fig. 3, a similar section along line 33 of Fig. 4; Fig. 4:, a transverse section along line H of Fig. 2; Fig. 5, a top plan view of the centering cup; Fig. 6, a top plan view ofa washer; Fig. 7, a top plan view of the cup securing ring; Fig. 8 is a view similar to Fig. 1 showing the drill pushed forward; Fig. 9 is an elevation of a drill press with the centering tool in position; Fig. 10, a section along line 1010 of Fig. 9; Fig. 11 shows a drill positioning gage;.Fig. 12, a longitudinal section of the drill lock. Fig. 13 shows in axial section a modified form of the tool and Fig. 14, an end view of Fig. 13 with the body portion removed.

The tool holder is provided with the usual tapered shank 19, which is securely fastened in the body 18 of the tool holder. An outer, cylindrical casing 20 of about twice the length of the body surrounds the latter with suflicient play to permit the one to slide on the other. Two L-shaped slots 24, situated diametrically opposite each other, are cut through the wall of the casing 20, and serve as guides for corresponding studs 30, tapped into the body 18. lVith the parts in the position shown in Figs. 1, 2 and 3, the studs abut against the upper end of the slots 2 L under the action of springs 36, as described later, thereby locking the parts together after assembling. At the inner end of the short leg of the slots isformed a recess 27 into which the studs 30 drop on the pushing 111p and turning of the casing 20 on the body At the lower end of the casing 20 is revolubly attached the centering cup 22 with a conical bore 41 contracting upward and terminating with a cylindrical opening 36, which I preferably" provide with rifle grooves 37, this for the purpose of preventing chips from the drilling to bind. The centering cup 22 is suspended on a ledge 38 provided at the lower end of the casing 20. 7

An adjusting nut 25 of slightly smaller diameter than that of the casing is threaded on the upper end of the centering cup 22, and between this nut and the ledge 38 is placed a washer 26. A small pin23, driven I into the cup 22, projects upward, in order to engage with'one of a plurality of holes provided in the washer 26, so as to key the washer and cup together. The nut 25 has a'threaded hole for a locking screw 40, which, when screwed in,projects downward slightly less than the thickness ofthe washer 26, and is positioned so as to engage with any one of the holes 39 in the washer 26.

Patented Aug. 31, 1915.

Another washer 21 is placed between the end A of the casing and the flange of the centering cup 22, thus transmitting the axial pressure from the blank or bar 42 to be centered to the casing 20, when the blank 42 has been placed between the centering cup 22 and the table cup 31. Bothwashers are made from some fairly soft material suchas fiber, brass, babbitt or the like.

' The utility of'this arrangement with the double washers will be evident. Ordinarily the nut 25 is not drawn up tight, but only enough to permit the cup 22 to revolve freely on the casing 20. When a blank of hard material is placed between the two cups 22 and 31, the cup will first revolve with the tool casing while light pressure is put on and the casing 20, while greater pressure is put on and the rest of the tool holder revolves. In case where no slip is provided between the casing and the cup, the conical surface of the latter, although hardened, might be abraded by the sharp edge of the blank 42. This is now avoided.

On the other hand, if a piece of soft material is going to be centered, the cup 22 might be permitted to revolve with the rest of the tool,as the edge of the still-standing blank would not be able to injure the conical surface of the centering cup 22. In such a case, the nut 25 would be drawn up tight on the centering cup 22 and locked thereto by the screw 40 engaging a suitable hole in the washer 26, which, in itself, as already described is locked' to the cup 22. The ledge 38 will then be tightly gripped between the two washers 21,26, thus permitting only a slight slip, between the cup and the casing or none whatever.

The shank 19, has a central bore for receiving the plunger or drill-lock 33, behind which a compression spring 35 is inserted, tending to 'push the plunger downward. This plunger is provided with an inclined groove 43, forming a key way for the bind ing screw 29, whichis threaded and countersunk in the body '18,"so as not to protrude beyond its cylindrical surface when screwed in. The turned-down point of this binding screw 29 runs through the side of the shank 19 in order to be able to enter the groove 43, and hold the plunger from. turning. The inclined bottom of this groove causes-a wedging between the plunger and the binding screw 29 so that the greater'the pressure on the plunger, communicated from the drill 44, the harder will be-the binding of the screw. The lower end of the plunger is formed to engage with the end o-f'a double ended drill 44 and is for thatpurpose'provided with prongs 45,'which are made to engage inthe helical flutes of the drill. Through thecooperation ofscrew 29 and plunger '33, the centering drill 44 is consequently prevented from turning in the tool holder. It will therefore be seen that this plunger acts not only as a drill look, but also as a positive stop, preventing the drill from being pushed up, when pressed against the work.

In the central bore of the body-piece 18, the cylindrical sleeve or drill carrier 32 fits snugly, its upper end having a recess, into which the end of the plunger 33 is made to enter. The inner diameter of the sleeve coincides with that of the'drill 44 in order to give support along the whole length of the drill, and the outer diameter of the drill is the same as the diameter of the cylindrical opening 36 in the cup 22. As the length of the sleeve 32 is such that it will enter this hole 36- in advance of the drill point reaching the blank 42, any wabbling of the drill is prevented, it being perfectly guided throughout its entire length, close down to its working point during operation.

vanylubricant such as oil or soap-water that enters through the openings 48 in the casing 20, will pass through the holes 47 and the conical opening 46 and run down to the drill point, as well as passing on the outside of the sleeve 32 and through grooves 37, collecting in the conical chamber in cup 22. No possibility of clogging does therefore exist.

The sleeve 32 is held in place by means of a holdingscrew 28, which with its narrow end enters 'a corresponding hole in the -sleeve32. This holding screw is threaded and countersunk in the body 18 in the same manner asscrew 29. The end of binding screw 28 is long enough to reach through the wall of thesleeve for the'purpose of clamping the drill 44 in position. This clamping need however, only be very slight,

in order to hold the drill in engagement with the plunger 33, which, as has already been described, locks'the drill against turning in the tool holder.

The two screws 28'and 29 are preferably situated with their center lines in the same axial plane-of the tool holder, and a longitudinal'slot-49 is provided in the casing 20 located so as to register with the screws 28 and 29, when the tool holder is compressed as shown in Fig. 8, and the studs 30 engage the notches 27 The screws may then be reached from the outside and loosened by means of a screw driver, when the drill needs re-setting.

Compression springs 36 are'housed in suitable chambers 50 provided in the body '18. For protecting them against chips and dirt, their lower ends are inclosed in cylindrical tubes 34, which abut with their bottom'ends against the upper surface of the cup retaining nut 25. The outer diameter of the tubes is the same as that of the chamhers-50, into which they project sufliciently to be well guided. The springs 36 are inserted under compression so that they always tend to hold the parts in the position indicated in Figs. 1, 2 and 3.

Ordinarily the sleeve 32 acts as a gage for determining the depth of the hole to be drilled, as the end of the sleeve will abut against the face of the bar or blank to be centered and prevent the drill from penetrating deeper into it, even if the drill continues to rotate.

for the tool holder, consisting of a plunger 53 which has a groove 52 tapered similarly to the groove 43 in the drill lock 33. A set screw 51, threaded in the tool body 18 so as to be below the cylindrical surface of the tool body, engages in the groove 52, and by means of this screw, the axial position of the plunger might be changed. Both the plunger 53 and its spring 54, which tends to push the plunger down, are housed in a bore 55 provided to one side of the shank 19 in the body 18. By letting the end of plunger 7 53 project beyond the lower end surface of the tool body, the plunger will abut against centering cup 22 sooner than the sleeve 32 abuts against the work piece, thus shortening the stroke of the tool sleeve and lessening the depth of the hole to be drilled.

Whenever it is desired to go back to the regular depth of the hole, all that needs to be done is to push up and turn the casing20 on the body 18 until the stud 30 entersthe recesses 27 then loosening the set screw 51 with a screw driver, which can enter through a corresponding opening in the casing, then to push back plunger 53 and re-set with the set screw 51. Y I Fig. 11 shows a drill-setting gage 55 with a recessed portion 56 corresponding in shape to the drill point. The use of this gage will be easily understood. After push-, ing'the casing 20 up on the body '18 and turning it until locked by studs 30 in the notches 27, as already described, the hold,- ing screws 28 and 29, which now register with the slot 49, are loosened with consequence that spring 35 partially pushes out the drill lock 33 and the drill 44. If now the gage is held over the drill point and pushed up until its head strikes the end of the sleeve 32, and the holding screws are retightened, the drill point will protrude to exactly correspond with the recess in the gage and uniform holes may thereupon be drilled in a number of blanks, care being taken that the drilling is continued until the sleeve 32 abuts against-the work piece.

In Fig. 9 the tool holder is shown in position on a drill press. A brake for the centering cup in the form of a fork 57 is here provided. The prongs 58 of the fork are shaped so as to embrace and tightly hold the centering cup 22 when it enters between them, thus preventing the rotation of the cup while engaging with the work piece or blank 42, although the rest of the tool holder rotates. I

The modified form of the centering tool illustrated in Figs. 13 and 14 is intended to be used in connection with a chuck which 'is obvious that all the holds the work piece firmly. In that case the centering cup is not necessary. The lock 33 for the drill 44 and its spring 35 are all the same as described above, the drill lock having an inclined key way 43 engaging with a holding screw 29 which may be, as before, tapped in the body 60 of the tool,

but preferably as here shown is tapped in the drill sleeve 61. The sleeve in this case, is areceptacle both for the lock with its spring and the drill 44. It dilfers further by being split longitudinally to form three grippers for the drill, no holding screw like 28 being required. It 'is also provided with a swell 66 near its outer end. This swell is conical and engages with a corresponding recess in the tool body 60, so that the sleeve will firmly grip the drill 44, on being drawn into the tool body 60, which is accomplished bymeans of the interengaging threads at 62 of the sleeve and the tool shank 63. The shank, which is revolubly mounted in the tool body 60, isiretained therein by means ofa washer 63 and screws 64. By turning the shank until the cone shaped swell 66 abutsa'gainst its recess'in the tool body, it parts will be firmly locked together. Similarly to the first embodiment of the invention, the sleeve 61 constitutes a depth gage, the end of the sleeve forming a positive stop when abutting against the work piece, thus governing the v depth of the hole to be drilled. The end is also cup shaped as at 64 with the transverse holes '47 communicating with the conical recess forthe purpose of flushing. The sleeve 61 and the tool body 60are non-revolubly connected by means of groove and pin 61. I

I claim 1'. A centering tool having a central member holding the drill, a casing slidably mountedrelative to said member, a centering cup revolubly mounted on said casing at the drill end of the tool, said cup having a conical recess for receiving the workpiece, and a central opening, the wall of which constitutes a support for the 'drill during operation and washers between said cup and said casing, for increasing the friction, and means for taking up wear'on the washers.

2. A centering tool having a central member holding the drill, a casing slidably mounted relatively to said member, a centering cup revolubly mounted on said casing at the drill end of the tool, said cup having ing at the drill end of the tool, said cup having a conical recess for receiving the work-piece, and a central opening, the wall of which constitutes a support for the drill during operation; and means for increasing friction between the cup and the casing, said means comprising washers and adjusting means therefor.

.4. A centering tool having a central member holding the drill, a casing slidably mounted relative to said member, a centering cup revolubly mounted on said casing at the drill end of the tool, said cup having a conical recess for receiving the work-piece, and a central opening, the wall of which constitutes a support for the drill during operation; and means .for increasing friction between the cup and the casing; said means comprising a ledge on said casing, a friction washer on either side of the ledge, one of said washers being loose and the other keyed to the cup.

5. A centering tool having a. central member holding the drill, a casing slidably mounted relative to said member, a centering cup revolublymounted on said casing at the drill end of the tool, said 'cuphaving a conical recess for receiving the work-piece, and a central opening, the wall of which constitutes a support for the drill during operation; and means for causing friction between the cup and the casing; said means comprising a ledge on said casing, a loose friction washer between said cup and the outer face of said ledge, a second friction washer keyed to said cup and engaging with the inner face of said ledge; said second washer being provided with a plurality of key holes, a nut threaded on said .cup and engaging with said second washer, a locking member in said nut constructed'to engage with any one of saidkey holes, wherebysaid nut may be adjusted either to permit free turning of the cup relative, to said casing, or to lock cup and casing together by tightening said nut so as to set up considerable friction between said ledgevand said washers.

6. A centering tool having a bodymember with an axial bore, a spring-actuated plunger in the bore tending to push the drill forward, and provided with a wedgershaped key-way, deepening rearwardly, a binding screw threaded in said body member and adapted to engage in said key-way, whereby said plunger will be locked the firmer, the greater the pressure becomes on its forward end. I

7. A centering tool having a body member with an axial bore, a spring-actuated plunger in the bore tending to push the drill forward, a binding screw threaded in said body member adapted to lock said plunger in said body member, the forward end of said plunger being constructed to firmly grip the end of thedrill, whereby said plunger in cooperation with said holding screw, will prevent the turning of the drill relative to said member.

8. A centering tool having a body member with an axial bore, a spring-actuated plunger in the bore tending to push the drill forward, a binding screw threaded in said body member adapted to lock said plunger in said body member, the forward end of said plunger being constructed to firmly gripthe end of the drill, whereby said plunger in cooperation with said holding screw, will prevent the turning of the drill relative to said member, and means for holdplunger in cooperation with said holding screw, will prevent the turning of the drill relative to said member, and means for holding the drill in engagement with said plunger; said means comprising a second binding screw threaded in said body member.

10. A centering tool having a body member with an axial bore, a spring-actuated plunger in the bore tending to push the drill forward, and provided with a wedgeshaped key way deepening rearwardly, a binding screw threaded in said body member and adapted to engage in said key way, whereby said plunger will be locked the firmer, the greater the pressure becomes .on its forward end, the forward end of said plungerhaving prongs for engaging in flutes of the drill.

l1. Acentering tool having a body mem ber with an axial bore, a spring-actuated plunger in the bore tending to push the drill forward, and provided with a wedgeshaped key way deepening rearwardly, a binding screw threaded in said body member and adapted to engage in said key way, whereby said plunger will be locked the firmer, the greater the pressure becomes on its forward end, the forward end of said plunger having prongs for engaging in flutes of the drill, and means for holding the drill in engagement with said plunger; said means comprising a second holding screw threaded in said body member.

12. A centering tool having a body member with an axial bore, a spring-actuated plunger in the bore tending to push the drill forward, a binding screw threaded in said body member adapted to lock said plunger in said body member, a sleeve in said bore forming a carrier for the drill, a

second binding screw threaded in said body member and adapted to hold said sleeve and the drill-in position; and means for keying the drill to said plunger so as to turn with it;

' 13. A centering tool having a body member ,with an axial bore, a spring-actuated plunger'in the bore tending to push the drill forward, a binding screw threaded in said body member adapted tolock said plunger in said body member, a sleeve in said bore forming a carrier for the drill, a second binding screw threaded in said body member and adapted to hold said sleeve and the drill inposition; and means for keying the drill to said plunger so'as to turn with it; the nose of said sleeve having a tapered recess around the drill pointand communicating therewith for flushing, and transverse openings for removing drill chips.

14. A centering tool having a body member with an axial bore, a spring-actuated plunger in the bore tending to push the drill forward, a binding screw threaded in said body member adapted to look said plunger in said body member, a sleeve in said bore forming a carrier for the drill, a second binding screw member and adapted'to hold said sleeve and the drill in position; and means for keying the drill to said plunger so as to turn with it, a centering cup slidably mounted on said body member, said cup having a central opening corresponding in diameter to the outside diameter of said sleeve and constructed to register with and guide said sleeve in advance of the-drill point reaching the work-piece. 7

1,5. A centering tool having a body member with an axial bore, a spring-actuated plunger in the bore tending to push the drill forward, a binding screw threaded in said body member adapted to lock saidlplunger in said body member, a sleeve in said bore forming a carrier for the drill, a second binding screw threaded in said body member and adapted to hold said sleeve andthe drill in position; and means for keying the drill to said plunger so as to turn with it, a centering cup slidably mounted on saidbody, member, said cup having a central opening corresponding in diameter to the outside diameter of said sleeve and constructed to register with and guide said sleeve in advance of the drill point reaching the workpiece; said opening being provided with rifle grooves for admitting a lubricant for the flushing and removing of drill chips.

16; A centering tool having a body member with an axial bore, a spring-actuated plunger in the bore tending to push the drill forward, a binding screw threaded in said body member adapted to lock said plunger in said body member, a sleevein saidbore forming carrier for the drill, a. second threaded in said body binding screw threadedin said body member and adapted to hold said sleeve and the drill in position; and means for keying the drill to said plunger so as to turn with it; a casing provided with a guideway and slidably mounted around said body member, a centering cup on said casing at its forward end, a stop in said body member engaging in said guideway in the casing and permitting limited axial movement between them. i I

17 A centering tool having a body member with an axial bore, a spring-actuated plunger in thebo retending to push the drill forward, a binding screw threaded in said body member adapted to lock said plunger in said body member, a sleeve in said bore forming a carrier for the drill, a second binding screw threaded in said body member and adapted to hold said sleeve and the drill in position; and means for keying the drill to said plunger so as to turn with it;

a casing provided with a guideway and slidably mounted around saidbody member, a centering cup on said casing at its forward end, a stop in said body member engaging in said guideway in the casing and permitting limited axial movement between them, a spring tending to push said body member and casing apart, and a closed housing for, the spring, preventing grit from reaching it. g

18. A centering tool having a body member with an axial bore, a spring-actuated plunger inthe bore tending to push the drill forward, a binding screw threaded in said body member adapted to lock said plunger in said body member, asleeve in said bore form: ing a carrier for the drill, a second binding screw threaded in said body member and adapted to hold said sleeve and the drill in position; and means for keying the drill to said plunger so as to turn with it; a cas ing provided with a guideway and slidably mounted around said body member, a centeringoup on said casing at its forward end, a stop in said body member engaging in said guideway in the casing and permitting limited axial movement between them; a plurality of coiled springs; said body member providing seats for the springs, a closed housing for each spring, being guided at one end bysaid'seat and at the other end abutting against said cup.

19; A centering tool having a body mem ber with an axial bore, a spring-aotuated plunger in the bore tending to push the drill forward, a binding screw threaded in said body member adapted to lock said plunger in said body'member, a sleeve in said bore forming a carrier for the drill, a second binding screw threaded in said body member and adapted to hold said sleeve and the drill in "position;'and'meansfOr keying the drill to said plunger so as to turn with it;

body member providing seats for the springs, a closed housing for each spring, being guided at one end by said seat and at the other end abutting against said clip; said guideway being L-shaped with its transverse leg forward andprovided with a notch for said stop, in order to lock the tool in its compressed position and uncover said binding screws, after the-"turning of the casing on the body member.

20. A vcentering tool having a body' member with an axial bore,- a spring-aetuated plunger in the bore tending to push the drill forward, a binding screw threaded in said body member adapted to locksaid plunger in said body member, a sleeve in said bore forming a carrier for the drill, a second binding screw threaded in said body member and adapted to hold said sleeveand the drill in position; and means for keying the drill to said plunger so as to turn with it; a casing provided with a guideway and slidably mounted around said body member,- a centering cup on said casing at its forward end, a stop in said body member engaging in said guideway in the casing and permitting limited H axial movement between them; a plurality of coiled springs; said body member providing .seats for the springs, a closed housing for each spring, being guided at one end by said seat and at the other end abutting against said cup; said guideway being L-shaped with itstransverse leg forward and provided with a notch for said stop, in order to lock the tool in its compressed position, after the turning of the casing on the body member, said casing having a window for said binding screws, registering with them when the tool is in its compressed position.

21. A centering tool having a body member with an axial bore, a spring-actuated plunger in the bore tending to push the drill forward, a binding screw threaded in said body member adapted to lock said plunger in said body member, a sleeve in said bore forming a carrier for the drill, a second binding screw threaded in said body,

7 member and adapted to hold said sleeve and jeo the drill in position; and means for keying the drill to saidplunger'so as to turn with it; a casing provided with a guideway and slidably mounted around said body member, a centering cup on said casing at its forward end, a stop insaid body member e'n-' gaging in said guideway' in the casing and permitting limited axial movement between them; a' positive stop overning the amount of axial displacement between said cup and the drill.

22. A centering tool having a body member with an axial bore, aspring-actuated plunger in the bore tending to push the drill forward, a bindingcscrew threaded in said body member adapted tolock said plun slidably mounted around said body mem-' bet, a centering cup on said casing at its forward end, a stop in said body member engaging in said guideway in the casing and permitting limited axial movement be-' tween them, a positive stop governing the amount of axial displacement between said cup and the drill, said stop comprising a spring actuated piston carried in a suitable chamber provided in said body member, and a set screw in said body member for adjusting the projecting length of said piston beyond the forward surface of said body member and' in the direction of said cup.

'23. A centering tool having a body memher with axial bore, a spring-actuated plunger in the bore tending to push the drill forward, a binding screw threaded in said body member adapted tolock said plun 'er in said body member, a sleeve in said bore orming a carrier for the drill, a second binding screw threaded insaid body member and adapted to hold said sleeve and the drill in position; and means for keying the drill to said plunger so as to turn with it;va' casing provided with a guideway and slidably mounted around said body member, a centering cup on said casing at its forward end, a stop in said bodymember engaging in said guideway in the casing and permitting limited axial movement between them, a positive stop governing the amount of axial'displacement between said cup and the drill, said'stop comprising a spring actuated piston carried in a suitable chamber provided in said body member, and a set screw in said body member for adjusting the pro-' jecting length of said piston beyond the forward surfaceof said body member and in the direction ofsaid cup; said guideway being L-shaped. with its transverse leg forward provided with a notch for said first stop,;in order to lock the tool in its compressed position for resetting the drill after theturning of the sleeve on the body member; said casing having a window for said set' screw situated to register therewith when the tool is in compressed locked position; I M 1 24. A centeringv tool having a central member-holding the drill, a casing slidably mounted relative to said member, a centering cup revolubly mounted on said casing at the drill end of the tool, said cup having a conical recess for receiving the Work piece; a brake for said cup mounted independently of and in fixed position relative to said cup.

25. A centering tool having a central member holding the drill, a casing slidably mounted relative to said member, a centering cup revolubly mounted on said casing at the drill end of the tool, said cup having a conical recess for receiving the work piece; a brake for said cup mounted independently of and in fixed position relative to said cup, said brake comprising a fork having vprongs constructed to embrace 26. A centering tool having a central.-

member holding the drill, a casing slidably mounted relative to said member, a centering cup revolubly mounted on said casing at the drill end of the tool, friction increasing means between said cup and said casing, said cup having a conical recess for receiving the Work piece; said recess forming a receptacle for drill chips.

The foregoing specification signed at Syracuse, N. Y. this 16th day of J uly, 1914.

CHARLES J. BORGESON. In presence of C. GRAon KENTNER, ALEX. PALMER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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