US444062A

US444062A - Nut-tapping machine

Info

Publication number: US444062A
Authority: US
Publication date: 1891-01-06
Anticipated expiration: 1908-01-06

Description

(No' Model.) heat -sheet 1.

A G. L. CHAPMAN. NUT TAPPING MACHINE N0. 4.4 4,06Z. Patented Jan. 6, 1891.

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(No Model.)

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c. L. CHAPMAN. NUT TAPPING MAGHINB.

N0. 444,062; Patented Jan. 6, 1891.

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No. 444,062. Patented Jan. 6, 1891.

a) K W Y A rromvs rs UNITED STATES PATENT OFFICE.

oLAEENcE L. CHAPMAN, oE ERIE, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO HENRY I. PETRIE, OF LITTLE FALLS, NEw YORK.

N UT-TAPPlN G MACH N E.

SPECIFICATION forming part of Letters Patent No. 444,062, dated January 6, 1891.

Application filed March 11, 1890.

To all whom it Hwy concern.-

Be it known that I, CLARENCE InOHAP MAN, of Erie, in the county of Erie and State of Pennsylvania, have invented a new and Improved Nut-Tapping Machine, of which the following is a full, clear, and exact description.

The object of the invention is to provide a new and improved machine for cutting the thread in punched blanks'for nuts which will be simple and durable in construction, very effectiveand entirely automatic in operation, and will require no manual labor except filling the hopperwith the blanks.

The invention consists in anautomatic device for removing the nut-blanks singlyfrom the hopper and delivering the same regularly in proper position to the tap.

The invention further consists of means for automatically feeding the tap and lifting it; and it also consists of a mechanism for automatically removing the tap from the spindle to dump the threaded nuts.

The invention also consists of certain parts and details and combinations of the same, as will be hereinafter fully described, and then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a plan view of a single machine. Fig. 2. is a sectional side elevation of the same on the line a; a: of Fig. 1. Fig. 3 isa side elevation of the same. Fig. 4 is an elevation of the opposite side of the same with parts broken out. Fig. 5 is a plan view of the clutch mechanism with parts in section. Fig. 6 is a sectional end View of the same on the line 3 y of Fig. 5. Fig. 7 is an enlarged sectional side elevation of the tap-holder. Fig. 8 is a sectional plan view of the same on the line 2 .2 of Fig. 7. Fig. 9 is an enlarged inverted plan view of the clamping device for the tap. Fig. 10 is a face view of the cam-plate for the same. Fig. 11 is an enlarged sectional plan view of the feeding device; and Fig. 12 is an enlarged sectional side elevation of the tap-dumping mechanism.

Serial No. 343,450- (No model.)

The improved nut tapping machine is mounted on a suitably-constructed frame A,

in the upper rear part of which is journaled the transversely extending main drivingshaft B,carrying at one end a pulley B, connected with suitable machinery for imparting 5 5 a rotary motion to the said main driving-shaft B. On the latter is also secured a smaller pulley B over which passes a quarter-turn belt B also passing over a pulley B secured on the vertically-arranged spindle C, mounted to turn in suitable bearings formed in a bracket A, secured on the top of the frame A at its front end.

On the spindle C, above the pulley B is a loose flanged collar 0, against the under side of which presses a spring 0 coiled on the spindle C and restingat its lower end on the web or hub of the pulley B. The latter is held in place on the spindle by a collar 0 secured to the spindle, and on the top of which rests the under side of the hub or web of the pulley B The spring 0 serves to exert pressure against the pulley B and consequently the spindle C, when the latter is raised in an uppermost position,the collar 0 striking 7 against the upper bearing on the bracket A, and a further upward motion of the pulley B then compressing the spring 0 On the lower end of the spindle O is held the tap-holder D, carrying the tap E, having along shank E, on the lower end of which are formed the usual cutting-threads E for tapping the nuts. The shank E is sufficiently less in diameter than the threads E so that the nuts after being tapped can readily slide on the said shank E. The latter is provided on its upper end with a polygonal or square offset E adapted to pass into a correspondingly-shaped opening D formed in the lower part D of the tap-holder D, which lat- 9o ter is made of the two parts D and D of which the part D screws on the part D, and said part D is secured to the lower end of the spindle O, as is plainly shown in Figs. 2 and 7.

On the upper end of the square ofiset E o the tap E is formed a semicircular annular recess E adapted to be engaged by pins D held to slide radially in the lower part I) of the tap-holder, the outer ends of the said pins being secured to springs I), secured on the said part I) of the tap-holder. The springs have the tendency to hold the pins D in an innermost positionthat is, in contact with the annular recess E"so as to hold the tap E in place in the holder 1).

The extreme upper part of the tap-shank I1 is formed with a rounded-off head E as is plainly shown in Fig. 7. The under side of the lower part D of the tap-holder D is provided with a cone-shaped recess 1), which permits the head E of the shank E to be readily guided into the opening E when the tap is reinserted in the tap-holder, as hereinafter more fully described.

On the spindle 0, below the driving-pulley 15', is secured a bar F, forming part of the lifting mechanism F for raising the spindle C to raise the tap E after one nut is tapped and has slipped onto the shank E of the said tap, the tap being then ready to again engage the next following nut in order to tap it. On the outer ends of this bar F of the lifting device F are secured trunnions, to which are pivotally connected links F piv otally connected with levers F which are in turn pivoted at F to the main frame A.

On the levers F are held friction-rollers F traveling on a cam G, secured on a transversely-extending shaft G, mounted to turn in suitable bearings in the frame A. On the shaft G is secured a worm-wheel G meshing into a worm G, secured on an inclined shaft G, mounted to turn in suitable bearings in the main frame A, and provided at its upper end with a bevel gearwheel G meshing into a bevel-pinion G, secured on the main driving-shaft B. IVhen the latter is rotated,.a rotary motion of the same speed is transmitted to the spindle C by the belt 13 and the pulleys B and B. At the same time a rotary motion is transmitted to the shaft G by the bevel gear-wheels G and G, the shaft G and the worm G and worm-wheel and G but in such a manner that when the shaft B has made thirty-two revolutions the shaft G has made one revolution. Every time the shaft G makes one revolution its cams G, engaging the friction-wheels F of the lovers F", cause the latter to swing upward so as to raise the spindle C, thereby lifting the tap E after one nut is tapped and for the purpose of placing a new nut in place to be tapped when the spindle 0 again descends, as hereinafter more fully described.

On one outer end of the shaft G is secured an arm G carrying an adjustable linger G adapted to engage one of the teeth ll of a toothed wheel H, which carries on its face a pin 1-1 adapted to engage an arm H secured on a transverse]y-extending shaft I, arranged below the shaft G and mounted to turn in suitable hearings in the main frame A. On the hub ll of this arm H is mounted to turn loosely the toothed wheel II, previously mentioned, the said wheel ll being turned the distance between two teeth at every revolution of the shaft G by the linger i, hold on the arm G secured to the said shaft G. The shaft I governs the dumping device J of the tap E and also the mechanisn K for disconnecting the tap from its holder D.

On the shaft I is secured a cam-wheel I, on the periphery of which is held one arm of a bell-crank lever 1 extending horizontally and fulcrumed on the main frame A. The other arm of the said bell-crank lever I is formed like a shifting fork, and engages a clutch I, mounted to turn with and to slide on the shaft I and adapted to engage a correspondingly-shaped clutch 1 formed on one face of a gear-wheel I, held to rotate loosely on the shaft I. The gear-wheel I is in mesh with a large gear-wheel I", secured on the shaft G, the said gear-wheel I being about four times as large as the gear-wheel I. A spring I is coiled on the shaft I between the hub of the cam I and the smooth end of the clutch I the said spring 1 serving to quickly force the clutch I in mesh with the clutch I", when the bell-crank lever l is free to shiftthat is, when its arm passes suddenly over the back of the cam I.

On the rear outer end of the shaft I is secured a cam-wheel L for operating the dump iug device J, and the mechanism K, for disengaging the tap from the holderD. For the first purpose this cam L is provided on its outer face with a pin L, adapted to engage an arm J, extending from a lever J fulcru med at J on the outside of the main frame A. From this lever J projects forward a segmental gear-wheel J", meshing into a gearwheel J, secured on one end of a transverselyextending shaft J", mounted to turn in suitable bearings arranged on the outside of the lubricating-box N, secu red to the under side of the bed-plate of the main frame A, as is plainly shown in Figs. 1 and t.

On the shaft J is secured a segmental arm 0, adapted to pass over the slightly outwardly-curved end of the front of the lubricatingbox N. ()n the outer end of this segmental arm 0 is secured a horizontally-extending part 0, on the top of which is held the nutholder 0 provided with an opening 0, covered by a transverse bar 0", and through which passes the nut to be tapped by the tap E. The nut-holder O is arranged to contain two nuts at a time, one being under the bar 0' and the other one alongside of it at the in ner end of the holder and directly under the tap E. The holder O is made removable from the segmental arm 0, so as to change it according to the size of the nuts to be tapped.

\Vhen the segmental arm 0 is in the position shown in Fig. 9, the inner nut abuts against the end of the nut-holderand also on the sides of the same, so that its punched aperture will be in line with the tap E. Directly under this nut to be tapped are arranged openings in the bottom of the nut-holder O and also in the part 0', for the free passage of the threaded end E of the tap E.

On the under side of the plate 0 is arranged a clamping device P, adapted to engage the threaded end E of the tap E whenever the latter is to be disengaged at its upper end from the holder D, and as is plainly illustrated in Fig. 12. This clamping device P is provided with a bolt P, on which are pivoted two jaws P and P having. segmental openings arranged opposite each other to conform to the diameter of the blade end E of the tap E, as is plainly shown in Fig. 9. The two jaws P and P are pressed toward each other by springs P secured to the under side of the plate O, and the said two jaws P and P are held apart as long as the segmental arm 0 is in the position shown in Fig. 2 by their inner ends P engaging the inclined edge of arms N formed on a fixed plate N secured to the inside of the front of the lubricating-box N. The downward motion of the tap E is limited by the fixed plate N extendinghorizontally inthe lubricating-box N, as illustrated in Fig. 2. The two jaws P and P are spread apart at their segmental openings, but their rear ends P engage the beveled arms N of the fixed plate N that is, when the segmental arm 0 is in the position shown in Fig. 2 and the tap is ready to tap the nuts.

\Vhen the segmental arm 0 swings to remove the plate 0 from the lubricating-box N,

plate N so that the springs P pressing on the said jaws, close the same, so that they engage the blade end E of the tap E and hold the same in position. The outer end of the opening 0 of the nut-holder is adapted to register, when the segmental arm 0 is in the position shown in Fig. 2, with a channel 0 arranged on the top of the lubricating-box N, the outer end of this channel being connected with the inclined chute Q of the nut-feeding device Q.

Under the channel 0, and secured to the under side of the top of the lubricatingbox N, is arranged a spring 0 forming at its free end an upwardly-extending lug O engaged by the under side of the plate 0' when the segmental arm 0 is in the position shown in Fig. 2, so that the spring 0 is bent downward. The moment the segmental arm 0 swings upward and carries the plate 0' with it then the compressed spring 0 springs upward and its lug 0 passes in front of the channel 0, so as to prevent the nuts from passing out of the said channel into the lubrieating-box N. hen the plate 0 swings back again,it again presses out the lug O of the spring 0 to disengage the same from the opening of the channel 0", so that the nuts can again pass from the channel to the nutholder 0 The gear-wheel J is not secured rigidly on the shaft J but is held loosely thereon, and is connected with one end of a coiled spring J connected at its other end to a collar J secured on one outer end of the shaft J so that in case of accident the gear-wheel J 5 can be rotated by the segment J 4 without turning the shaft J", but compressing the spring J it being understood that this would only take place in case the segmental arm 0 is locked in place by the tap E, as shown in Fig. 2. A

spring 9 is coiled on the said shaft J and serves to insure the return movement of the shaft J after the nuts are dumped from the shank E of the tap E, as hereinafter more fully described.

In the periphery of the cam L is formed a recess L and on the said periphery is held to travel a friction-roller K, journaled in one end of a short arm K secured on one end of a transversely-extending shaft K mounted to turn in suitable bearings in the main frame A. On the shaft K is secured a forwardlyextending lever K provided at its outerend with a ring K concentric with the spindle C.

b On this ring K is held to travel a frictionroller K journaled on one end of a lever K fulcrumed on the upper part D of the tapholder D and projecting with its inner end through a recess in the said part D, the inner end being provided with an offset K adapted to engage a slot D formed in a plunger D held to slide verticallyin the part D of the holder D. From this plunger D extends downward a pin D adapted to pass onto the head E of the tap E, and serving to disengage the latter from the pins D and to press it out of the holder D as hereinafter more fully described, preparatory to dumping the nuts which have accumulated on the shaft E of the tap E.

The chute Q previously mentioned is provided on its upper end with a twist Q and is supported at its upper end on a lever Q fulcrulned loosely on a shaft S, mounted to turn in suitable bearings in the main frame Aand arranged transversely below the main driving-shaft B. On this shaft S is secured a pulley S, over which passes a belt S also passing over a pulley SZsecured on the shaft G, which, as previously described, is rotated from the main shaft B.

The rotary motion of the shaft G is transmitted by the pulley S, the belt S and the pulley S to the shaft- S. On the latter is secured a wheel T, having a shoulder T cut in its periphery, the said shoulder serving to take up one of the nutsfrom an inclined hopper U, in the lower narrow end of which fits part of the said wheel '1, so that at every revolution of the wheel '1 its shoulder T takes up one of the nuts in the hopper and carries and dumps it onto an inclined flange Q, formed on a narrow chute Q7, inclined, as shown in Fig. 2, and secured to the lever Q and opening at its lower into the upper end Q of the chute Q. The lever Q is provided on its outer end with a curved projection Q adapted ICC to be engaged by a toothed wheel Q secured on the shaft G and turning with the latter. The toothed wheel in passing over the projection Q imparts a swinging motion to the lever Q so that the chute Q is vibrated and a similar motion is imparted to the chute Q, resting at its lower end on the top of the lubricating-box N at the end of the channel as previously described. A nut taken up by the shoulder T" falls fiat onto the flange Q, and from the latter, by the vibratory motion of the chute Q into the narrow channel of the latter in an upright position, as shown in Fig. 2. The nuts are successively delivered into the upper end Q of the chute Q, which upper end, on account of its twist,turns the nut until it lies flat and slides down the said chute Q into the channel 0 and from the latter into the holder 0 when the said holder registers with the said channel as previously described.

The operation is as follows: hen the main driving-shaft B is rotated, the several mech anisms are set in motion in the manner presently to be described. \Vhen the machine starts, the cams G on the shaft G, acting on the friction-rollers F raise the levers E" which, by being connected with the spindle C, raise the latter, so that the tap E moves upward with the spindle and its lower threaded end E is above the holder which latter is then free to receive two nuts pressed into the holder from the series of nuts contained in chute Q. The innermost nut is then in the proper position to be acted on by the threaded end E of the tap, and as soon as the cams G have disengaged the friction-rollers F the previously-compressed spring 0 presses the spindle (J downward and forces the lower threaded end E of the tap E into the punched aperture of the respective nut, so that as the spindle C has a constant rotary motion the threaded end taps the nut in the usual manner and the nut, afterhaving passed the threaded end, remains on the shank E of the tap. When this takes place, the cams G again engage the friction-rollers F to raise the spindle C, which latter and its tap E are moved upward, carrying the threaded end along. When the spindle is in its uppermost position, a new nut is shovedinto place on the holder 0 and when the spindle again descends the second nutis threaded in the manner above described. This motion is continued until fifteen nuts have accumulated on the shank E of the tap E. New at every revolution of the shaft G the finger G moves the toothed wheel II the distance between two teeth, and as the wheel II is provided with fifteen teeth its pin H engages the arm 11 and carries the latter'with it, so as to turn the shaft I. At the end of the fifteenthrevolution of the shaft G the shaft I has made one revolution, and at the same time the bellerauk lever I drops off of the back of the cam I, (see Figs. 6 and 5,) so that the spring 1 pressing on the clutch I throws the latter into mesh with the clutch I, and as said clutch I is constantly rotated from the large gear-wheel1 and the gear-wheel I a rapid rotary motion is imparted to the shaft- I by the said gear-wheels I and I". At the time when the cams G lift the spindle O the sixteen th time, as previously described, the cam L on the shaft I is in such a position that the friction-wheel K travels up the incline L of the said wheel L, whereby the lever K by its ring K acting on the lever K swings the outer end of the same upward and the inner end K downward, so as to press or hold the plunger D in position while the spindle C, with its holder D, slides upward vertically. The'pin D now presses on the head of the tap E, so as to force the pins D outward, which thus disengage the annular recess E, whereby the shank E is unlocked from the lower part D of the holder D, and the square end E of the shank slides out of the opening D as the spindle 0 moves into its uppermost position. At this time the wheel L moves its pin L into contact with the lever .1, so that the latter is turned until the pin L slips over the segmental arm J. As the said lever J 2 oscillates from the pivot J which is located a suitable distance below the shaft I, carrying the wheel L, the oscillation carries the lever out of the circular travel of the pin L. The movement of the leverJ forces its segmental arm J upward, so that the gear-wheel J 5 is turned, and by the connection of the latter with the spring J the collar J and the shaft J 6 the latter is given a half-turn, whereby the segmental arm 0 swings outward, carrying with it the tap E, which is freed at its upper end from the holder D, as previously described. As soon as the arm 0 commences to swing outward, the jaws P and P close by the action of the springs P, and on account of being disengaged from the beveled lugs N of the fixed plate N the jaws P and P in closing clamp the threaded end E of the tap E, so as to hold the latter in place on the plate 0, attached to the segmental arm 0. hen the shaft J turns into the position shown in Fig. 12, the shank E of the tap E extends downward, so that the nuts which had been held above the thread E of the shank E now slide off the latter onto the ground or a suitable receptacle located below the machine under the shaft J. As soon as this has taken place the spring J causes a return movement of the shaft J at the time when the pin L has left the arm J of the lever J so that the shaft J with the said lever J returns to its former position, the tap E being free from all the tapped nuts. As soon as the tap again moves into its vertical position, as shown in Fig. 2, the jaws I and P again engage the shoulders N of the fixed plate N and are thereby opened to release the tap E, and at the same time the upper end of the shank E of the said tap is engaged by the downwardly- IIO ' the sliding holder D, the conical end D of which guides the head E into the opening D the head finally passing over the spring-pressed pins D which latter again snap onto the annular recess E so as to lock the tap again to the holder D, as previously described. The next upward movement of the spindle 0 carries the tap along, a nut is again pushed into the holder 0 which now again registers with the channel 0 in the manner above described, and the previously-described operation is repeated. WVhen the shaft I is given one quick revolution by the gear-wheel I at the time the clutches I and I are in mesh and the revolution is almost completed, then the bell-crank lever 1 by traveling up the steep inclined part of the cam I, (see Fig. 6,) com- 'mences to move the clutch I out of contact with the clutch I; but the movement of the lever I will barely disengage the clutch-teeth without leaving any clearance between the teeth. The additional movement for the shaft I is, however, furnished by the weight of the arm K and the lever K, which press at this time the friction-roller K onto one side of the .recess L in the cam L, thus turning the shaft sufficiently to move the bell-crank lever to the highest point of its cam I, and thereby completely separating the two clutches I and I and giving plenty of clearance for the same while not in mesh. The friction-roller K always stands in the lowest point of the recess L of the cam L when the latter is not turned by the shaft I. lVhen the frictionroller K stands in its lowermost position, the lever K also hangs downward and its ring K does not affect the lever K" and the plunger D when the spindle rises and falls, as above described, to tap the respective number of nuts for which the machine is constructed at every full revolution of the toothed wheel H. When the roller K stands in the lowest point of the recess L of the cam L, then the pin L stands in its lowermost position, and when the cam L turns with the shaft I the said roller, in traveling up the steep side of the recess L actuates the device for disengaging the tap from the holder D before pin L acts on the lever J to turn the shaft J so that the tap is'free from the holder D before the segmental arm 0 swings the tap to dump the tapped nuts, as above mentioned. It will be seen that should a blank nut with an opening too small for the size of the tap E used,'or a nut not punched at all, come into the nut-holder 0 under the tap, then the spindle O, carrying the tap, when it meets such an error, will simply be held in a raised position, with the lower end of the tap turning on top of the faulty nut. The other parts of the machine keep up their functions, however; but when the shaft J is to be turned by the segmental gear-wheel J turning the gear-wheel J the latter makes its half-revolution, but only compresses the spring J 7 without turning the shaft J The faulty nut can be easily removed at any time by the operator in charge of the machine.

In case an unpunched nut is in the holder under the tap E then the nut-feed wheel '1 still delivers at each of its revolutions a nut to the chute Q but as the chute Q is filled with nuts, the additional nuts passing down the chute Q fall over the upper end of the chute Q to the ground. This also takes place when the wheel T feeds the nuts faster as they are taken and threaded in the manner above described.

It is understood that a series of machines may be placed one alongside the other on the same frame, to be driven from the main driving-shaft B, it then not being necessary to provide a separate shaft I and clutch mechanism for each machine, as one will be sufficient to impart the necessary movement to a shaft J, which will be common for the dumping mechanism of each machine. The several spindles O are then also connected with each other by a continuous bar instead of the trunnioned bar F, the said bar being connected at its ends with the links F of the single lifting mechanism, as shown and described. The shaft K will then carry a lever K for each spindle to disengage the tap from the respective spindle. The several movements of the series of machines will then be simultaneous. For different-sized nuts correspondingly-sized taps and feeding-chutes must necessarily be employed.

For nuts of a size largerthennine-sixteenths of an inch the spindle O is driven by gear- Wheels instead of the belt 13 and pulley-connections, as such nuts require more power for threading.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent 1. In a nut-tapping machine, the combination, with an inclined chute U, having the space between its side walls at its inner open end contracted, of a rotary wheel T, the inner portion of which enters said contracted space and provided with a toothless periphery having a notch forming a single radial shoulder T, to pick up one nut ata time and carry it outside of the hopper, substantially as set forth.

2. In a nut-tapping machine, a nut-feeding device comprising a wheel having a shoulder adapted to pick up and carry a nut, and a vibrating inclined chute having flanges onto which discharges the shoulder of the said wheel, substantially as shown and described.

3. In a nut-tapping machine, a nut-feeding device comprising a wheel having a shoulder adapted to pick up and carry a nut, a vibrating inclined chute having flanges onto which discharges the shoulder of the said wheel, and a second chute having a twisted upperend and into which discharges the said chute, substantially as shown and described.

. 4. In aunt-tapping machine, a spindle having a. tap-holder adapted to support the tap and a plunger within said holder to engage the upper end of the tap and push it out oi. the holder, substantially as shown and described.

5. Ina nut-tapping machine, a spindle having a tap-holder adapted to support the tap, the spindle being held to slide vertically, in combination with a plunger for automatically disconnecting the tap when the said spindle moves upward, substantially as shown and described.

6. In a nuttapping machine, a tap-holder having a polygonal recess for the reception of the polygonal end of the tap, and springpressed pins held to slide in the said holder and adapted to lock the tap in place in the said holder, substantially as shown and de- .seribed.

7. In a nut-tapping machine, the combination, with a tap having a polygonal end formed with an annular semicircular recess, of a tapholder having a polygonal recess for the reception of the polygonal end ot. the tap, spring-pressed pins held to slide in the said holder and adapted to lock the tap in place in the said holder, and a plunger having longitudinal movement in the holder to engage the upper end of the tap and push its recessed end past the pins, substantially as shown and described.

8. In a nut-tapping machine, the combination, with a taphaving a polygonal end formed with an annular recess, of a tap-holder having a polygonal recess for the reception of the polygonal end of the tap, spring-pressed pins held to slide in the said holder and adapted to lock the tap in place in the said holder, and a plunger held to slide in the said tap-holder to disconnect the saidtap and holder, substantially as showii and described.

9. In a nut-tapping machine, the combination, with a swinging arm, of a nut-holder and a clamp to grasp the tap when the arm and attached holder and clamp are swung outward, substantially as set forth.

10. In a nut-tapping machine, the combination, with a swinging arm, of a nut-holder thereon, a normally-open tap-grasping clamp adjacent thereto and closing on the tap when the arm is swung outward, and a clamp opener or releaser in the path of the clamp when the arm with its attached holder and clamp are swung inward, substantially as set forth.

11. In a nut-tapping machine, the combination, with a lubricant tank or receiver, of a swinging arm mounted to swing into and out of the tank or receiver and provided with a nut-holder on its end within the tank, substantially as set forth.

12. The combination, with a rock-shaft provided with a loosely-mounted operating-gear and a spring connecting the gear and shaft, of a nut-holder mounted onv said arm, substantially as set forth.

13. In anut-tappingmachine, the combination, with a nut-holder mounted to swing and having an end opening, of a fixed chute adapted to register with the said end opening, and an inclined vibratingchute discharging into the said fixed chute, substantially as shown and described.

l-t. In a uut-tap 'iing machine, the combination, with a nut-holder mounted to swing and having an end opening, of a fixed chute adapted to register with the said end opening, and a fixed spring adapted to be engaged by the said nut-holder and serving to close the end opening of the said chute, substantially as shown and described.

15. In a nut-tapping machine, the combination, with a nut-holder, of a plate supporting the said nut-holder, spring-pressed jaws pivoted on the said plate, and a fixed plate having beveled arms adapted to be engaged by the said jaws to open the latter, substantially as shown and described.

16. In a nut-tapping machine, the combination, with a spindle mounted to rotate and to slide vertically, of a tap-holder held on the said spindle and adapted to support the tap, a rocking lever for imparting an upward sliding motion to the said spindle, and a plunger for disconnecting the tap and its holder when the spindleis on one of its upward movements, suhstantiall as described.

17. In aunt-tapping machine, the combination, with a lever mounted to swing and provided with a ring,of atap-holder passing centrally through the said ring and adapted to support the tap, and a second lever fulcrumed on the said tap-holder and adapted to travel with one end on the said ring, and a plunger held to slide in the said holder and operated by the said second lever to remove the tap from the holder, substantially as shown and described.

18. In a nut-tapping machine, the combination, with a lever mounted to swing and provided with aring, of a tap-holderpassingcentrally through the said ring and adapted to support the tap, a second lever fulcrumed on the said tap-holder and adapted to travel with one end on the said ring, a plunger held to slide in the said holder and operated by the said second lever to remove the tap from the holder, and cams for actuating the said leverand the said holder to move both simultaneously upward, substantially as shown and described.

19. In a nut-tapping machine, the combination, with a lever mounted to swing and provided with a ring, of a tap-holder passing centrally through the said ring and adapted to support; the tap, a second lever fulcrumed on the said tap-holder and adapted to travel with one end on the said 1'ing,a pluugerheld to slide in the said holder and operated by the said second lever to remove the tap from the holder, cams for actuating the said lever and the said holder to move both simultaneously upward, and a spindle having a rotary and a sliding motion and carrying the said holder,substantially as shown and described.

20. In a nut-tapping machine, the combination, with a spindle mounted to turn and to slide,of a lever connected with the said spindle to raise the same, and a cam operating on the said leverto raise the same,substantially as shown and described.

21. In a nut-tapping machine, the combination, with a spindle mounted to turn and to slide, of a lever connected with the said spindle to raise the same, a cam operating on the said lever to raise the same, and a spring pressing on the said spindle to move the same downward, substantially as shown and described.

22. In a nut-tappin g machine, the combina tion, with a spindle mounted to turn and to slide, of a lever connected with the said spindle to raise the same, a cam operating on the said lever to raise the same, a finger held in the said cam, a toothed wheel actuated by the said finger and carrying a pin, and a shaft carrying an arm adapted to be engaged by the said pin to turn the said shaft, substantially as shown and described.

23. In a nut-tapping machine, the combination, with a spindle mounted to turn and to slide, of a lever connected with the said spindle to raise the same, a cam operating on the said lever to raise the same, a finger held in the said cam, a toothed wheel actuated by the said finger and carrying a pin, a shaft carrying an arm adapted to be engaged by the said pin to turn the said shaft, a cam held on the said shaft, and a lever actuated by the said cam for detaching the tap from the said spindle,substantially as shown and described.

24. In a nut-tapping machine, the combination, with a spindle mounted to turn and to slide, of alever connected with the said spindle to raise the same, a cam operating on the said lever to raise the same, a finger held in the said cam, atoothed wheel actuated by the said finger and carrying a pin, a shaft carrying an arm adapted to be engaged by the said pin to turn the said shaft, a cam held on the said shaft, a lever actuated by the said cam for detaching the tap from the said spindle, and a detaching device connected with the holder of the said spindle and actuated from the said lever, substantially as shown and described.

25. In a nut-tapping machine, the combination, with a shaft having a slow-tn rning move ment, of a cam held on the said shaft, a shifting lever actuated by the said cam, a clutch held to slide on and to turn with the said shaft and connected with the said shifting lever, and a gear wheel having a constant rotary motion, mounted loosely on the said shaft and provided with a clutch adapted to be engaged by the said first-named clutch, substantially as shown and described.

26. In a nut-tapping machine, the combination, with a shafthaving a slow-turning movement, of a cam held on the said shaft, a shift-.

ing lever actuated by the said cam, a clutch held to slide on and to turn with the said shaft and connected with the said shifting lever, a gear-wheel having a constant rotary motion, mounted loosely on the said shaft and provided with a clutch adapted to be engaged by the said first-named clutch, and a spring pressing on the said first-named clutch to force the latter suddenly in contact with the gear-wheel clutch,substantially as shown and described.

27. In a nut-tapping machine, the combination, wit-h a shaft having an intermittent fast and slow rotary motion, of a cam-wheel secured on the said shaft and provided with a pin and a recess in its periphery, a lever adapted to be engaged by the said pin and provided with a segmental gear-wheel, a gearwheel in mesh with the said segmental gearwheel, a second shaft on which is mounted loosely the said gear-wheel, and a spring coiled on the said shaft and secured at one end to the said gear-wheel and at its other end connected with the said shaft, as set forth.

28. In a nut-tapping machine, the combination, with a shaft having an intermittent fast and slow rotary motion, of a cam-wheel secured on the said shaft and provided With a pin and a recess in its periphery, a lever adapt-ed to be engaged by the said pin and provided with a segmental gear-wheel, a gearwheel in mesh with the said segmental gear- Wheel, a second shaft on which is mounted loosely the said gear-wheel, a spring coiled on the said shaft and secured at one end to the said gear-wheel and at its other end connected with the said shaft, and a segmental arm secured 011 the said shaft and carrying the nut-holder, substantially as shown and described.

29. In a nut-tapping machine, the combination, with a shaft having an intermittent fast and slow rotary motion, of a cam-wheel secured on the said shaft and provided with a pin and a recess in its periphery, a lever adapted to be engaged by the saidpin and provided with a segmental gear-wheel, a gearwheel in mesh with the said segmental gearwheel, a second shaft on which is mounted loosely the said gear-wheel, a spring coiled on the said shaft and secured at one end to the said gear-wheel and at its other end connected with the said shaft, a segmental arm secured on the said shaft and carrying the nut-holder, and a tap-clamping device held on the said segmental arm and adapted to support the tap, substantially as shown and described.

30. In a nut-tapping machine, the combination, with a sh aft having an intermittent fast and slow rotary motion, of a cam-wheel secured on the said shaft and provided with a pin and a recess in its periphery, a lever adapted to be engaged by the said pin and IIO provided with a segmental gear-wheel,a gear- I Wheel, aseeond shaft 011 which is mounted the tap, and u fixed plate for openingt hesaid loosely the said gear-Wheel, a spring coiled clamping device, substantially as shown and 10 on the said shaft and secured at one end to described. the said gear-wheel and at its other end con- 5 nected with the said shaft, a segmental arm secured on the said shaft and carrying the \Vitnesses: nut-holder, a tap-clamping device held on the JOHN R. GOTT, said segmental arm and adapted to support I FRANK XV. SMITH.

CLARENCE L. CHAPMAN.