US140780A - Improvement in screw-cutting-machines - Google Patents

Description

E. B. .IAYGOX & A. WEBSTER.

Screw-utting Machines.

No, 140,73()l .P atentedluly15,1873..

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GILBERT B: JAYCOX, OF HARTFORD, AND ALLEN WEBSTER, OF FARMING- TON, CONNECTICUT; SAID JAYCOX ASSIGNOR OF ONE-HALF HIS RIGHT TOWM. EDGAR SIMONDS, OF HARTFORD, CONNECTICUT.

IMPROVEMENT IN SCREW-CUTTING-IIIIACHINES.

Specification forming part of Letters Patent No. 140,780, dated July 15, 1873; application filed November 1e, 1872.

DIVISION B.

To all whom it may concern:

Be it known that we, GILBERT B. J Arcox, of Hartford, in the county of Hartford and State of Connecticut, and ALLEN WEBsrEE, of Farmington, in said county and State, have jointly invented certain new and useful Improvements in Machines forCuttingScrew- Threads in Nuts, of which the following is a specification, reference being had to the accompanying drawings, in which- Figure lis a side view or elevation of the machine embodying such improvements. Fig. 2 is a top or plan view of the same, and Fig;

`3 is a detached view of the clutch-movement made use of in the machine.

The machine is an automatic device for cutting screw-threads in nuts; and the particular parts in which the invention consists will be particularly set out and specified in the claims at the end of this specification.

The letter a. indicates the mainframe or base, upon which the other parts 'are set. From it project upward the standards a1 a2, in the tops of which runs the shaft b, which is free to move longitudinally in either direction, so far as its bearings in these standards are concerned. On this shaft are hung the pulleys c and d, driven by belts in opposite directions, indicated by their .respective arrows, to the opposed sides of which are attached the rims c1 and d', inclosing a clutch arrangement, which we will proceed to describe. Referring now to Fig. 3, there is shown the side of the pulley c, with the rim c1 attached. To the shaft b, at this point, are attached the clutch-arms b1 b1. To the side of the pulley c, within the rim c1, are attached pins c2 c2, which do not project to the edge of the rim. Precisely similar pins are similarly attached to the side of the pulley d, within the rim d', the length of the two sets of pins being such as to allow the clutch-arms some little play from one set of pins to the other. It will be readily understood that the motion of the shaft is reversed by causing the 'clutch-arms to disengage from one set'of pins and to engage with the other. In both ends of the shaft b are fixed the screw-taps e c, which are just alike, and their threads running in the same direction. In this case they are righthanded threads. These are the taps which thread the nuts. On the shaft'b is cut a screwthread, b2, (in this case a right-handed thread,) taking into a corresponding female thread in the nut-piece j', the foot of which moves back and forth in ways g. This nut-piece f has a vertical slot, f', into whichruns the pin 1, projecting from the lever t, which is attached at its foot to the shaft 2, to the opposite end of which is attached the ball-lever i3, weighted at the top with the ball i4.

In the drawings the parts are shown in the position occupied by them when the shaft is actuated by the pulley d and the tap e' has commenced to thread a nut. When the nut is fully threaded the nut-piece f will have moved back far enough on the screw b2 to throw the ball-lever 3 past a vertical position, and inclining in an opposite direction from that it occupies in the drawing, when the weight of the ball will come into play, and'it will move the shaft back so that the clutcharms b1 will engage with the clutch-pins of the pulley c, thus reversing the motion of the shaft. At the proper time the motion is again reversed in the same Way, and so on indefinitely.

The nuts to be threaded are fed from a hopper or hoppers into the troughs h h', standing edgewise one upon another in single file therein. There is an orifice at the bottom of the troughs, on the side facing the taps, just large enough to let a nut. escape. The tap strikes into the central hole in the nut and turns away till a thread is cut; then the tap is pulled back, the motion of the tap reversed, the nut is unscrewed off the tap and drops down into a proper receptaclebeneath. While one tap is cutting a thread the other is running ong' it nut, and so on indenitely.

ings o o o o project from the trough, which will allow the bottoms of a nut to play back and forth with the tap,'but will not allow it to turn with the tap. There is a spring, s s', upon each tap, which presses the nut so as to make it engage with the tap when its motion is reversed, if by chance, or purposely, the screw of the tap runs quite through and clears the nut.

It will be observed that the tap, in cutting the nut, bears against it with the force given by the Weight of the ball 4.

We claim as our invention- 1. The combination of the rotary and longitudinally-reciprocating shaft b2, 4provided with the clutch-arms and the nut-piece f, the contrarilyrotating clutch pulleys c d, and the ball-lever i3, actuated from the nut f, the Whole constructed, arranged, and designed for oper-4 Witnesses:

WM. E. SIMONDs, GEORGE G. SILL.

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