US294092A - speeey - Google Patents

Description

(No Model.)

E. A. SPERRY.

MACHINE FOR CUTTING SCREW THREADS. No. 294,092. Patented Feb. 26, 1884.

Wnesses: Jnveniar:

UNTTED STATES PATENT @rrrce.

ELMER'A. SPERRY, OF CORTLAND, NEW YORK, ASSIGNOR TO JESSE- VAN DENBURGH, OF SAMfE PLACE.

MACHINE FOR CUTTING SCREW-THREADS.

SPECIFICATION forming part of Letters Patent No. 294,092, dated February 26, 1884.

Application filed September 30, 1882. (No model.) v

To all whom, it may concern:

Be it known that I, ELMER A. SPERRY, a citizen of the United States, residing at Cortland, in the county of Cortland and State of New York, have invented certain new and useful Improvements in Screw-Thread-Gutting Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters or figures of reference marked thereon,

which form a part of this specification.

dies are brought into engagement with the blank without being at any time disconnected from the power.

In the drawings, Figure 1 represents a longitudinal section of the machine. Fig. 2 represents a top elevation of a portion of the ma chine, showing the lever controlling the cam- 7 plates. Fig. 3 represents a front view of the die.

It will be seen from the drawings'that A represents a hollow spindle of a bolt-machine,

provided at its extremity with a face-flange,

. nal E, as shown.

a, to which are pivoted the die-carriers B B, each of which is provided at its extremity, opposite the pivot, with a radially -projecting pin, 1), adapted to operate in the slots provided in the cam-plates O 0. These plates project from the shifting-sleeve D, which is loose on the shaft, and is grooved to receive the ring (1, for attachment of the shifting-lever E,which is pivoted, suitably, to a projection of the jour- The flange a is provided on its periphery with slots or depressions, in which are fitted the cam-plates O O, which slide therein longitudinally, but are rigidly insured thereby against transverse strain. The dies B B are adjustably or otherwise attached to their carriers B B, and are brought in and out of engagement with the work by a swinging movement of said carriers about their pivots b b. The dies are shown in their extreme open positions in Fig. 3 by dotted lines. The pulley G is attached rigidly to theshaft, and no portion of the system, whether in or out of operation, is at any time disengaged from the power.

For supplying constant lubricant to the dies I have devised a pump, now to be described.

The base H of the machine forms a-reservoir for the lubricant, and is provided at the back in its floor with a depression or well, (7, the aperture of which is screw-threaded, and provided with the cylindrical portion of a curved casting, I. The bore of said cylindrical portion forms the pump-barrel, .and is provi'ded'with a loose plunger, 0, driven from the eccentric f, secured to shaft A, as shown. The perforation in' the outward end of the casting I is threaded, to receive the piping 9, leading to the nozzle 9. The inserted end of said pipe 9 serves to retain the ball 71. in a suitable counterbore below, this forming the only valve of the pump. The pump-barrel is pierced at 'i a little below the plunger when in its uppermost position, but in such proximity thereto that it is entirely coveredthereby before said plunger has completed its downward stroke. An annulus, j, of wire-cloth or other suitable screen, is provided over the well, to prevent egress of foreign substances. The operation of the devices detailed above is as follows: The blank or work is secured in a chuck of usual form. The machine receives a constant rotation in one direction from the pulley G. The dies being closed, the blank is fed to them, and when the operation has proceeded sufliciently they are disengaged from said blank, while still in constant rotation, by manipulating the lever E and sliding the col lar D and cam-plates O C to such a position that the pins 1) b, by engagement in the camslots, rock the die-carriers B B to their outermost position. (Shown in dotted lines in Fig. 3.) The threaded blank is then withdrawn and a new one provided, and the operation repeated.

The pump operates as follows: At each upward stroke of the plunger, when its lower extremity has passed and opened passage i, the lubricant, by gravity, fills the barrel, and

in that portion of the stroke below said opening said plunger forces it out to the tube 9, past the valve 71, which retains it during the upward stroke of the plunger, as can readily be understood. A detachable pan with a perforated bottom is provided under the dies, for the retention and ready removal of chips.

The pump, per 80, is not sought to be covered in this application, as that device in its relation as shown is designed to make subjectmatter for a separate application.

Many slight alterations may be made in the detailed construction without departing from the spirit of the invention. For instance, gearing may be used, instead of the pulley G, in

the largermachines, and a hand wheel or crank in hand-machines.

By my construction I do away with the necessity of a clutch such as is usually employed in similar machines.

I am aware that the dies in open-die machines have been operated by means of cam plates and slots; but the movement of parts,

:BED EJDSPLB effecting the change simultaneously, brought sliding canrplates O C, the eccentrics f and pulley G, the whole being adapted to throw the dies in and out of action without disconnecting the power, as and for the purposes set forth.

I11 testimony whereof I afiix my signature in presence of two witnesses.

ELMER A. SPERR-Y.

\Vitnesses:

'M. M. WATERs, J. MCLERNAN.

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