US116301A - Improvement in spindles for screw-machines - Google Patents

Description

"UNITED STATES Barniv'r OFFICE.

DEARBORN P. GLINES, OF MANCHESTER, HAMPSHIRE, ASSIGNOR TO DANIEL Y M. ROBERTSON, OF BOSTON, MASSACHUSETTS.

' IMPROVEMENT msPlNDLEs FOR scREw-MAcH|Ni-:s.

Speciiication forming part of Letters Patent No. 116,301, dated June 27, 1871.

To'all 'whom fit may concern:

Be it known that I, DEARBORN P. GLINEs, of Manchester, in the county of Hillsborough and State of New Hampshire, have inventeda new and useful Improved Spindle for Screw-Machinery; and I do hereby declare the following to be a full and correct description of the same, reference beinghad to the accompanying drawing, in whichof devices forming part of the spindle of a screwmachine, which afford the means of readily ladjusting the griping-jaws which receive and hold the screw-blank while being threaded, and of compensating for their wear, all as hereinafter more particularly described.

In the accompanying drawing the details of construction of the devices constituting the feed motion by which the blanks are delivered to the griping-jaws are not represented, inasmuch as said feed-motion is not of my invention, and a detailed description of it is not necessary to an explanation of my improvements in spindles.

A in the drawing marks the frame of the machine by which the working parts are supported. K is a pulley attached to the spindle, which receives motion from a band driven by any suitable prime mover. A pulley, H, at the end of the spindle, by means of a cord or band, communicates motion to the pulley B on the end of the cam-shaft O, to which is attached the cam D. This cam operates the upright lever E, which has its fulcrum at f. The upper end of lever E is in the form ofl Y, each arm of which has at its end an inwardly-projecting pin, b, which enters a groove, c, in a cylindrical collar, F, which slides longitudinally on the spindle and also revolves with it. G marks the walls of the hollow rear portion of the spindle 5 J, the more solid portion, and L, the hollow in its forward end. In the rear end of the portion G of the spindle is inserted the screw-head M, throughwhich passes the rod P, on the threaded end of which plays the nut N. The head M is threaded and works in a female screw at the rear end of Gr. Its outer portion is squared to admit of its being turned by a wrench whenit is desired to adjust its position in the spindle. The rod or bolt P has a large dat head, R, against which reacts a spiral spring, t', compressed between said head and the screw-head M, as seen in Fig. 2. To the head R of the rod P are pivoted, at m, theA arms Sl S', which, with the arms'T T', pivoted to them at m m', form a compound lever operating on the principle of the lazy-tongs, to which the sliding rod Uis pivoted at m. The arms S S have prolongations S S, which pass out through slots g gin cylinder Gr and enter slots c c in the sliding collar F. The ends of the projections S S work over the rounded surfaces of the dogs e c. As the collar F moves forward the arms S S are forced toward each other; as it moves backward they are thrown apart. The rod U passes forward through aperforation in the more solid portion J of the spindle. To its forward end are pivoted, at s, the toggle-arms V V, and these are again pivoted at t t to the griping-jaws W WV, which have their fulcrums at u u. As the rod U is pushed forward the arms V V are brought more nearly into line with each other and the griping-jaws are driven together.

adjusted by the screw-head M and nut N. The iirst or approximate adjustment of the system which operates the jaws W W is made by the screw-head M. The final adjustment is made by the nut N, which, in conjunction with the spring i, regulates the position of the rod P relatively to the head M.

The operation is'as follows: The screw-blank to be threaded is presented to the griping-jaws by the feeding device of the machine. The opening and closing of the griping-jaws are effected at the proper moment by the reciprocating movement of the sliding collar F, which operates the projecting ends S S of the arms S S. The collar E is operated by lever E, driven by camD on shaft G. It rotates with the spindle on which it slides, the spindle being driven by a band applied to pulley K. The approximation of the gripin gjaws IV W is controlled by the throw of the toggle-arms V V, and this is regulated by the position of head M and rod P, as before stated. The jaws can be adjusted to compensate for wear or to gripe blanks of different sizes withmore or less When the rod U is drawn back the jaws are separated. The play of the rod U is regulated by the position of the rod P, which is force. ns required. The thread is out in the usual arms V V, and jaws W W', in the manner and Way, which forms no partof my invention, for the purpose specified.

Havingthusfnilydesoribedmyinvention,what f5.l In combination with the rotating mandrel l elziiin, und desire to secure by Letters Patent, and system of toggies, levers, and jaws, as set is forth, the dogs e und sliding-collar F, in the mau 1. The combination of the head M, rod P, nut ner described.

N, :1nd spring,y z'. with the toggle-levers S and T, The above specification of my said invention :ind lneehmiisin oreonneetingthe same with the signed and witnessed at Manchester this 28th gripingizuvs, in the manner and for the purpose I day of March, A. D. 1871.

described; /Vitnesses: DEARBORN P. GLINES.

2. The combination, with the adjustable and C. N. STANLEY,

yiOnnOg rOd P, Of the arms s' s' 'r fr', ma U l GEORGE W. MORRISON.

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