USRE656E - Improved machine for threading bolts - Google Patents

Description

lllll rus nomas Paran ca., WASH-maren, n. cA

' ping nuts.

UNITTin STATES PATENT OTTTGE.;

`WILLIAM SELLERS,'OF PHILADELPHIA, PENNSYLVANIA.

IMPROVED MACHINE FOR THREADING BOLTS.

Specification forming part of Letters Patent N o. 18,775, dated December 1, 1857; Reissue No. 656, dat-edA February B, 1859.

To all whom it may concern:

Be it known that I, WILLIAM SELLERS, of l'hiladelphia, in-the county of Philadelphia andState of Pennsylvania, have invented a 'new and useful Improvement in the Method of Holding and Operating the Dies and Holding the Tap in Bolt-Machines; `and I do hereby declare that the following is afull and exact description -of the construction `and operation of the same, reference being had to 'the annexed` drawing, making a part of this specification, in which- Figure 1 is an end view. Fig. 2 is a vertical section through the center of the spindle. Fi g. 3 is a plan of the whole machine. Fig. 4 is a plan Iof the" die-holder and cam-box with the cover removed. Fig. 5 is a vertical section of the cani-box. Fig. 6 is asection through the center of the tap-holder. Fig; `7 is an end view of the tap-holder. Fig. 8 is an edge view of key for -tap-holder,and Fig. 9 is a side view ofsanie.` n

The object of` my invention is to avoid the necessity of reversing the motionof the cuttin g-dies', or of stopping the machine vto change the bolts,'and-to so arrange the-die and tap holder as to admit of greater facility in changing from one size thread to another lor to tap- To this end I place the dies A A A in a cylindrical piece of metal, B, which I call the die-box, and which is provided with radial grooves of' such size .as to receive the dies and to allow them to slide freely in a radial direction. The die-box B is securely attached to the face-plate C of the hollow spindle D, which carries the spur-wheel F, that receives vmotion from thepulley-shaft E by means of the pinion Gr. Surrounding and sustaining the spindle D I place another hollow spindle, H, having a face-plateor flange, I, at one end. The spindle His bolted to and is supported bythe 'tubular piece J of the fram e. On the .faceplate I there arev three eccentric or scroll cams, MMM, of equaleccentricity. They are securely bolted to the faceplate, leaving spaces N Nv N between them of suiiicient width to admit the dies A A A to pass freely. On the outer surface of the cams M M M, I bolt a covering-plate, 0, having. on its inner surface three cams, P P P, parallel-x with the 'cams M M M, and three springs, 'Q

Q Q, which springs are so placed as to form one side ofthe openings NN N through which the dies are inserted, and having also projections B It R, which form a continuation of the cams P P P. These springs are for the purpose ofkeeping the dies-from sliding out of the openings N N N whenever the dies are opened for the purpose of removing the bolt, and also to govern the position of the dies when first entered, so as to guide them upon the cams P P P. The face-plate I, cams M M M, and cover O, with its camsP P l?, I call the cam-lucir.7 O11 the wheel F, and movingv freely a suitable distance. around the hub thereof, I provide an adjustable stop, S, which may be securely att-ached to the wheel F by means of the bolt T, and having near its center a projection, U, which is of such length` as to come in contact with a similar projection on the wheel K, thereby conveying motionto the wheel KV and spindle H from; the pulley-shaft E.

To put the machine in operation, itis necessary, rst, to move the die-box B into such a position that the grooves to receive the dies shall correspond with the openings N N N between the cams M-M4 M. Into 'these openings the dies are then inserted and pushed forward until the projection R on the spring Q falls into an opening in the edge of the die, which is made to receive one of the camsV P, which cams are for the purpose of withdrawing the die from the center.y The dies now being in the die-holder, the next operation will be to adjust them to the size of the bolt to be cut. This is accomplished by slacking the set-bolt T on thel adjustable stop S, and then moving the die-boxB by means of the pulley-shaft E, pinion G, and wheel F, the wheels K with the cams M M M being held stationary. As this is done the dies A A A will be gradually forced by the cams M `M' M toward their common center and closed upon any finishedbolt or other object to which it may be desired to set them. While the wheels are in this position the adir stable stop S is moved so as to bring the p1 action U near its center in contact with a similar projection onthe wheel K, when lthe set-bolt T may be secured. If, now, tile wheel F be turned in the same direction as before, it will carry with it the wheel K ami threads from the point of entrance.

cams M M M, and as the dies A A A and cams M M M will be then moving in the same direction and at the same velocity there will be no farther movement of the dies in a radial direction.

y lo open the dies for the purposeof withdrawing the bolt, the pulley-shaft E being in motion, the pinion L must be moved by means of the loose collar a and handle V, so as to tighten the friction-clutch G L, which will. give an equal velocity to the two pinions G and L; but, as the pinion L is larger than the pinion G, the wheel K, `which is driven by L, will move faster4 than' the wheel F, which is driven by G, thereby causing the cam-box to move around the dies in the opposite direction to that irst described, and thel camsP PVP i will force the dies from the center.

To close the dies preparatory to or during the operation of cutting the bolt, the pulley-shaft E being in motion, the pinion Lis forced bymeans of the loose collar a. and handle Y against the leg l', which is covered here by a piece of leather, so as to create friction. This will canse the pinion to stop, together with the wheel K and cams M -M M.` The motion of the wheel F and die-box B will however, continue, thus causing the dies AA to revolve as rst described, thereby closin g the dies until the projection on the stop S cornes in contact with the simi-5 lar projection kon-thc wheel K, compelling it to move at the same velocity, when no farther movement of the dies in a radial direction will take place.

'The cutting-edge of the dies may be formed so as to cut a full thread by once passing over the bolt.` This is accomplished by iirst cutting a thread in the dies perfectly straight and cylindrical and of such size as to t the bolt where it has the threadcut upon it. The tops of the threads inthe dies are then dressed off, commencing at the base of the thread, where the bolt is entered, and terminating at the top ofthe thread aboutfour They are at the same time to bedressed back from the cutting-edge, so as to give a clearance. Each thread of the dies will thusiform a cuttingedge, and the thread upon the bolt will be formed by a series of cuts, each one deeper than its predecessor, until the perfect thread is developed'.

To lit the machine for tapping nuts, I provide. a cylindrical piece .of metal, W, which is turned to iit accurately in the hollow spindle D and die-box B, having a square hole through its center to receive the shank of the tap. In its outer surface I cnt a square recess, X, of the same width as the grooves in the die-box B, which receives the dies A A A. Having removed the dies, I insert in the place of one of them a piece of metal, Y, of the samev shape and size as the die, having the end nearest the center of the die-box `made square, so

as to it` in the recess X of the cylindrical piece W, and which serves as a key to prevent the piece W from turningin its place, the piece Y being forced into the recess X by the 'operation of the cam M, as described in the process for cutting bolts. The square shank of the tap is slipped into the hole of the same shape in the piece W, and the nntto be operated upon by the tap maybe held by any of the numerous devices now in use for that'purpose.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. Theuseof rotating dies, in combination with cams or their equivalent, when both are -so arranged as to be capable of revolving about a common center at different velocities,

for the purpose of opening and closing the dies, substantially as described. 2. The arrangement of cams with open spaces between them, in combination with the diebox and dies, substantially as described, to facilitate the changing of the dies.

3. The mode of attaching the tap-holder lto the revolving die-box, substantially as described. .A WM. snLLERs.

Witnesses:

COLEMAN SELLERS,

THEoDo-RE BERGNER. t

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