US4106A - Improvement in machinery for cutting wood-screws - Google Patents

Description

4 SheetsSheet L C. WHIPPLE. Machine for Making Wood Screws.

Patented July 10, 1845.

4 Sheets-Sheet 2.

C-. WH|PPLE.

Machine for Making Wood Screws.

I Patented July 10,1845.

4 Sheets Sheet 3 3.

C. WHIPPLE.

u Machine for Making Wood Screws. No. 4,196. Patented July 10, 1845.

N. PErERs, Phololiuwgraphcr. Washington. D, Q

Q A 4 Sheets-Sheet 4. C. WHIPPLE.

Machine for Making Wood Screws;

v Patented July 10, 1845.

No. 4.10s.

1 Z e ,2 v 2 M Q a ,a 7 .0 g a m PETERS. PhMo-Lvthographen Washingicm D. C

v UNITED STATES PATENT OFFICE.

OULLEN WVHIPPLF), 0F PROVIDENCE, RHODE ISLAND.

IMPROVEMENT IN MACHINERY FOR CUTTING WOOD-SCREWS.

Specification forming part of Letters Patent No. 4,106, dated July 10, 1845.

To all whom it may concern.-

Be it known that I, OULLEN WHIPPLE, of the city of Providence, in the county of Providence and State of Rhode Island, have invented a new and useful Machine for Cutting the Threads upon Wood-Screws, which machine Iden ominate the Self-Adj usting Screw- Finisher, and I do hereby declare that the following is a fulland exact description thereof.

The'cutter or chaser by means of which the threads'are to be cut is the same in all respects with that described and claimed by me in the specification of Letters Patent for a machine for cutting the threads upon woodscrews, granted tome under date of the 18th of August, in the year 1842; but the combination and arrangement of the other parts of the machinery, which I am now about to describe, differ essentially from that which was the subject of the patent above referred to. V In the accompanying drawings, Figure 1 is a perspective view of the whole machine drawn to a scale of one-half the medium size-- say for screws of three-quarters of an inch in length. Fig. 2 is a front elevation of such a machine of the fullsize. Fig. 3 is a view of the. right-hand end thereof. Fig. 4: is a top view with the omission of certain parts shown fully in the next figure. Fig. 5 is a top view of the apparatus into which the blanks that are to be out are to be fed and by which they are successively presented to the action of the tool for cutting the thread. Most of the operating parts shown in this figure are omitted in each of the others. The other figures represent parts in detail which could not be otherwise fully shown. In each of these figures where the same parts are shown they are designated by the sameletters of reference.

A A is the frame-work of the machine, which may be of cast-iron. The part A is a circular horizontal table, upon which is sustained a movable zone or ring I I and the apparatus by which it is governed in its motion, these parts being distinctly shown in Fig. 5. The zone or ring I I rests loosely upon the horizontal table A, and is kept in place by means of a projectingcircular rim N, Fig. 5, attached to or in one piece with the circular table A. The outer portion I of the ring has on its periphery a series of tubes a a, into which the blanks are to be fed.

These tubes are countersunk at the upper ends, so as to adapt them to the heads of the blanks, and below the countersunk part a portion of each tube is cut away, as shown at a, a, to admit the end of the cutter or chaser. The blank which is being cut is made to revolve within its tube by means of .a revolving screw-driver, which takes into the nick on its head and is operated in a manner to be presently described.

J J is a horizontal shaft, which may be conneoted with the first mover for the purpose of driving the machine. On this. shaft there is a bevel-wheel b, which gears into the bevel wheel I) (see Fig. l) on the vertical shaft 0. On this latter shaft there is an endless screw or worm c, that meshes into a worm-wheel D D on the main horizontal shaft B B, to which it consequently gives motion. This shaft runs in boxes a" a", attached to the frame; The shaft 0 passes up through the'table A, in which it has its upper bearing. Its continuation is seen at C, and to its upper end is affixed the spur-wheel e, which, gearing into the wheel g on a shaft R, (which is that which carries the screw-driver,) gives motion thereto.

G'G (shown in detail in Fig. 11) is a bar which I will call the vertical cutter-slide. This may be rectangular, and it passes through mortises in the bed A" and in the upper part A, Figs. 1 and 3, of the frame. In'these it slides up and down freely as the thread is chased by the cutter. The cutter is .not at tached directly to the bar Gr, but to the upper end of a lever 0 0, which works on a fulcrum: pin m, by which it is connected to said bar. The lever 0 allows the cutter to move laterally to and from the blank to be cut- The head 0 of this lever is widened out for the purpose of sustaining the cutter, which is shown in place at w 00, Figs. 4 and 11. This is held in place by the cap P, which has a curved groove on its underside to receive it, the screw q passing through said cap and into the head 0 of the lever. r is a steel spring that bears against the inner side of the lever 0, serving to force it back when not pressed up by .the apparatus by which the cutter is made to operate on the blank, which I will now describe.

E (shown most distinctly in Figs. 2 and 3) is a cam-wheel made fast on the main horizontal shaft B. The periphery of this wheel is divided into fourteen equal parts, and is cut so as to have on it thirteen tooth-like projections d d d, Fig. 3, the part d occupying two of the fourteen divisions, leaving twelve d (1 equal in size. Each of these projections operates as a cam in causing the cutter to operate on a blank. The number of equal projections determines the number of times that each blank shall be acted. on by the cutter, and this number may be varied; but that which I have given is found sufficient for screws of ordinary size. To the cutter-slide G is attached a hardened-steel bearing-piece a, the upper end of which is in the form represented, and is kept in contact with the projections d d of the cam-wheel. This wheel, therefore, by its revolution will depress the slide and carry the cutter down. The camteeth and the bearing-piece n'are made very true and smooth; The faces of the projections d, which act on the piece 41., are finished to an irregular curve, which is such as to cause the direct downward motionof the slide to be equal in equal periods of time, the motion of the wheel being uniform. The slide G is raised in the following manner after each descent: H is a steel spring (shown most plainly in Fig. 2) which presses on a liftingpiece V, that works on a joint-pin U and bears against a pin on the back side of the slide G. At the time when this lifting is effected the cutter is drawn off from the blank by the action of the gage-wheel F and its appendages.

F, Figs. 2 and 3, isv what I call the gagewheel, which is affixed to the horizontal shaft B. This wheel has a projecting rim z z' on its a number of parts corresponding with those of the projections on the cam-wheel, there being thirteen recesses or notches j j, twelve of which are. of one. size, while the other j corresponds with the projection d! on the cam-wheel. The gage-wheel F is intended to regulate the feed of the cutter in its successive actions on the blank. Under the. arrangement described the cutter will, as before remarked, operate twelve times in forming the thread of each screw, the operation on each being completed by one revolution of the shaft B. The cutter is forced up against the blank in the following manner: is is a lever which works on a fulcrum-pin Z, and the.

end k of which bears upon the face of the projecting rim is of the gage-wheel during thetime that the cutter is operating upon the blank. WVhen the point It. is by the revoluof the recesses j, the lever 0, with its cutter, is pressed back by the action of the spring 0",

and at the same instant the piece n falls into one of the notches on the cam-wheel, the slide G rising, consequently, to its original elevation. The lever 70 advances the cutter against a blank by bearing against a sliding piece t, which bearing is regulated by means of a thumb-screw .9. Every successive cut of the tool must of course be to a greater depth than at the part h. perfectly true and smooth, and there. bears that which preceded it, and this is effected in the following manner: The face of the projecting rim 7; '1; of the wheel F is not in a vertical plane; but each projecting portion rises by a regular inclination beyond that which preceded it, whichrise amounts in machines intended for cutting ordinary three-quarterinch screws, to about one-twelfth of an inch in its whole circumference. By this manner of forming the gage-wheel is also obtained the right taper on the screw. T is a conductor down which the chips pass from the cutter.

When the cutting of the screw is to be commenced, the screw-driver must be forced down so as to enter the nick on the blank, and when it has been completed it mustbe raised therefrom, and the zone or ring I I must be moved so far round as to bring another blank into the proper situation for the action of the cutter. I

The apparatus for depressing and raising the screw-driver is as follows: On one side of the cam-wheel E there is attached a broad rim or hoop U U,Figs. 1 and 2, and the situation of which is indicated also by the dotted lines U U, Fig. 3. This hoop is continuous for about ten-elevenths of a circle,

about one-eleventh of it being removed, as The on ter surface of it is made 011 it one end of a crooked lever Q, which is shown separately in Fig. 10. Its end Q is i that which bears on the hoop U U. It has a fulcrum-pin at Q". f the upper end of this lever, which pinenters face,.like a crown-wheel, which is divided into.

3 attached the vertical sliding rod P, that makes a part of the sliding frame PP, Figs. 1 and 3, which frame sustains the shaft of the screwdriver. When by the revolution of the cam- 70" is-a pin attached to a notch or opening in a piece 70'', to which is wheel the end Q of the lever Q is brought opposite to the opening h in the hoop U U, it falls E into it, and the sliding frame P, with the screwdriver attached to it, is raised. The. lever Q- L is kept in contact with the hoopU U by the action of a spring I, that bears against it. and is I attached to the circular table A. The passing I of the end of the lever Q into the recess in the hoop U occurs at the moment thata screw has been finished. R, Figs. 2and 3, is theshaft of v the screw-driver. 2 and revolves within the two. arms 0 0, Fig. 3, making a part of the stationary screw-driver j frame. By means of a feather the shaft R slides freely up and down through thewheel tion of the wheel F brought opposite to one 1 This shaft passes through 9, which is driven by the wheel e. 0-, Fig.5,

is the bottom plate or basis of the frame 0 O, which is fastened ontothe top. of the circular table A by screws, as at f f". The upper end of the shaft R is connected to thesliding {frame P by the springs or. n, Fig. 3. The lowermost of these springs serves to lift it, 3 and the upper one, by means of the thumbscrew 0", serves to adjust it tothe different thicknesses of the heads of the blanks. The

shaft R is depressed and the screw-driver r the rod 10 is depressed; but when it kept in contact with the blank by the bearing of the lever Q on the hoop U U.

The removing of the finished screw from the tubes or is eifected by the aid of the same hoop U that is concerned in the depressing and raising of the screw-driver. S, Figs. 2 and 3, is a stationary tubular rod placed vertically, which receives within it a small sliding rod 19. There is a slot along the rod S, and a small arm 0, attached to the sliding rod p passes through this slot and bears upon the periphery of the hoop U until it arrives at the opening h. While it bears on the hoop enters the opening it the spiral spring 4" forces the rod 10 up, which, passing into the tube containing the last but one finished screw, removes it and it falls into a receiver.

The apparatus used for causing the zone or ringl I to revolve and carry a blank to the distance necessary to its being operated on by the cutter is shown in Figs. 2, 5, 6, 7, 8, and 9. One side of the worm-wheel D D is widened out, so as to have a guide-groove f f f formed upon it. This groove passes uniformly round the wheel, excepting at the point f, Fig. 2, where it forms an angle, as represented. This groove receives the pin which constitutes the end of a short arm 9''. (Seen separately in Fig. 9.) From this arm a shaft M rises vertically and passes through the circular table A, and is firmly attached to an arm or lever K, which rests on the top of the table, as seen in Fig. 5. The

piece K is shown separately in Fig. 8, and the part of it to which the shaft M is attached is represented by dotted lines in Fig. 5. While the pin 9 remains in the direct part of the groove ff the piece K remains stationary; but when it enters the angular part f the shaft M is made to revolve partially back and forth and carries with it the piece K. The arm 9" is situated below the table A. The

shaft M, to which it is attached, has its stepin the stud d. To cause the pin g to pass readily back into the straight part of the groove f, a spring .9, the lower end of which is seen in Fig. 2, is made to bear against said pin, as shown in Fig. 0. The finger Von the piece K draws back the bolt y, Fig. 5, (seen separately in Fig. 6,) so as to relieve it from one of a series of notches on the interior edge of the ring I I. These notches at :0, &c., correspond in number and position with the tubes for the blanks, and it will be manifest that the bolty when inserted in one of these notches will keep the ring stationary. The bolt y is forced into the notches by means of a spiral spring 2 acting against the plate 0. To the piece K is also connected the feedhand L by a joint-pin a'. This feed-hand carries the ring I 1' round to the requisite distance. The steel spring 12", which has a bearing on the pin 0', serves to throw the feed-arm forward to the proper position to bear against the angle of one of the notches, as seen at 00. l

In describing the various parts of this ma chine I have also shown the manner in which they are intended to operate; but I will now give a general view of the action of the whole. The tubes at a in the horizontal ring I I are to be kept supplied with blanks, which. are to be fed in by hand. Immediately preceding the first operation of the cutter on a blank the lever Q will have occupied the recessh in the hoop U on the cam-wheel, and the lever is the recess ,9" in the gage-wheel, and the machine being in motion the cutter-slide G G will be raised by the action of the spring H on the joint-piece to. At the commencement of the ascent of the cutter-slide the cutter will be thrown back by the action of the spring on the lever 0. During this period of time the revolving of the hoop U on the cam-wheel will bring the end of the lever Q which had occupied the recess h in contact with said hoop, on the periphery of which it will rise, thereby lowering the screw-driver shaft, when the screw-driver will enter the nick on the blank, which it will cause to revolve rapidly. The lever k also at the proper instant will leave the recess on the gage-wheel and bear on a projecting part of its rim, bringing the cutter into contact with the blank. That one of the tooth-like projections on the cam-wheel which is next to the double one will at the same time be in contact with the steel bearing piece n, and the cutter will be thereby caused being succeeded to make its first out, which, by the action of the remaining cam-teeth, completes the screw. At the time of the completion of the screw last out the revolution of the cam-wheel will have brought the hoop U into the position in which the end of the lever Q will enter the recess h, and the screw-driver will be lifted. At this time the cutter will have been withdrawn from the screw, and the point 9 of the arm g traversing in the gnide groove f f of the worm-wheel, will have attained its greatest variation from its direct course in the angular part of the said groove f, in passing and returning along which it will have given the revolving motion to the shaft M necessary to the operation of the parts concerned in the shifting of the ring II one notch in the manner above described, which will bring a fresh blank into a situation to be operated on by the cutter, and will also bring the cut screw directly over the rod p. This screw will be removed by the passing of the small arm 0"" into the recess h by the revolution of the hoop U, which will leave the rod 10' free to rise by the action of the spiral spring 1'.

Having thus fully described the manner in which I construct, combine, and arrange the respective parts of my self-adjusting screwfinisher, what I claim therein as new, and desire to secure by Letters Patent, is

1. The manner in which I arrange the horizontal ring of zone I I tubes for receiving the blanks, in combination with the apparatus by which said ring or zone and its surrounding is made to revolve to'the requisite distance to bring a fresh blank opposite to the cutter after a screw has been finished.

2.'The manner in which I have combined the cam-wheel, the vertical cutter-slide, and the lever thereon which sustains the cutter, so that the respective parts shall co-o'perate, substantially as set forth.

3. The gage-wheel, with the inclination of its projecting rim and the recesses thereon, in combination with the spring-lever upon which said rim operates, by which the cutter is brought into contact with and removed fromtheblankwhichis being-cut, as described.

4. The manner in which I have combined the stationary and the sliding frames of the Witnesses:

WM. I-I. SWEET, ABRAHAM PAYNE.

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