US93097A - Improvement in screw-presses - Google Patents

Description

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FREDERICK H. -LAEOEGE AND GEORGE E. soMEEs, vor AWATERannir, AAssIeNons To TEEMsELvEs AND N. A. BALDWIN, -OE MILEOED, CONNECTICUT.

Laim 'Patent No. 93,097, dated Jut, 27,1869.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it 'may concern Be it known that we, FREDERICK H. LAFORGE and GEORGE E. SOME'RS, of Waterbury, in the county of New Haven,and State of Connecticut, have invented a new Improvement in Screw-Press; and we do hereby declare the following, when taken in connection with the 'accompanying drawings, and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, in

Figurel, a front view, and in v Figure 2, a top view.

fl"his invention relatesl to an improvement in stamping-presses, such as employ a screw to raise and lower the die, and are commonly operated by long arms extending out, by which the operator turns the screw. A number Qf revolutions being required to force down the die, and a corresponding number to raise it, the power is vgiveu,to a great extent, by the momentum ofthe levers, which are made very heavy. This construct-ion makes theI process of stamping' comparatively slow, and -the Object of our invention is to apply. power to drive the screw both down andup. To this end,

Our invention consists-iu applying', to the screw, a wheel, and causing the screw to revolve by the application of a revolving frictional surface to the said wheel, the said revolving surface adjustable, so as to arrest and reverse the operation of the screw, at pleasnre.v

' To enable others skilled in the art to construct and use our improvement, we will fully describe the same as illustrated in the accompanying drawings.

A represents the frame of a press, which may be of any known or convenient construction.

B, 4the cross-bar, through which .the threaded screw C works, running down therethrough when turned in one direction, and up when turnedin the opposite direction,the said screw, or a shaft to which it is attached, extending' up,so as to have a bearing at D.-

On the said screw, we fix a wheel, E, which we preferto make of suiiicient weight to give to the screw, when revolving, the necessary momentum but, if preferred, the wheel may be lighter, and the extra weight .applied at someother point on the shaft of the screw.

. E is a cross-bar, arranged so asto slide freely up and down in the frame with the screw as it traverses up and down, aud'which also hasalateral motion given to it by means of a lever, G, (see iig. 2,) which will throw' the saidl cross-bar to the' right or left, as the case may be..

To the said cross-bar, at each side of -tlie wheel E,

is fixed a shaft, carrying a pulley, H, and a frictionwheeLI, upon one side, and a pulley, J, and frictioni wheel K, on the other side.-

To each ofthe said pulleys H and J, power is applied, to drive them in opposite directions; and to them a rapid revolution should be given.

' When the bar F stands in a central position, as denoted in black, lig. 2, then neither of the friction-wheels I or K will bear against the surface of the wheel E;

but when the lever G is pressed to the left, as denoted in blue, then the friction-wheel K is brought'to bear hard against thev surface ofthe wheel E, which causes the wheel E to revolve, and force the screw up or down,

as .the case may be, (for convenience of illustration,4

say down and whenfn. sufficient velocity has been given to-the wheel E, that the momentum will carry the screw down with sufficient force, then the wheel E may be relieved from the action of the wheel K;

and immediately before, or as soon as the die-carried by the screw strikes the corresponding die, the other lor opposite revolving wheel- I should be pressed against the wheel E, by turning the lever G to the opposite side, as denoted in red, lig. 2. This will prevent any .inj ury or strain uponthe machine by the instantaneous stopping-of the screw, and .will immediately thereafter reverse the movement of the wheel E, so as to raise the screw; and as the screw approaches its highest point, the wheel K is againapplied, to arrest the movement of the revolvingwheel E, and reverse its operation, as required; Aand so on, the press may be operated with great rapidity.-

The bar F traverses up and down with the screw, and, as this and the mechanismattachedlo it and the screw are of no inconsiderable weight, it is desirable to counterhalance this, that is, to relieve' the screw from carrying such a load. lo this end,-.we apply couuterweights L L, by cords or chains f, running over

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