US82139A - Geoege matthewman - Google Patents

Description

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GEORGE MATTHEWMAN, OE BROOKLYN, NEW YORK..

Lettere .Patent No. 82,139, dated September 1 5, 1868.

IMPROVEMENT IN PRESSES.

TO ALL'WHOM Ir MAY OONOERN:

Be it known that I, GEORGE MATTHEWMA'N, of' Brooklyn, in the county of Kings, and State of New York,

have invented certain new and useful Improvements in Presses; and I do hereby declare the following is a full and exact description thereof.

My invention relates to provisions forv communicating a peculiar motion from the operating part or handlever to the pressing part or platen, and consists in the employment of two toggles, arranged to operate, the one upon the other, so as to effectthe motion in the manner set forth below. i

I will describe what I consider the best means of carrying out my invention.

The accompanying drawings `form a part of this specication.

Figure 1 is a vertical section through my press, with the platen raised.

Figure 2 is a corresponding' section, with the platen depressed.

Similar letters of reference indicate like parts in all the figures.

Tints are employed merely to aid in distinguishing the parte, and do not imply diTerences of material. The Aniatt'erial of the whole may be iron and steel.

A is the bed and framework ofthe press,'adapted to stand upon the ground or floor, and firmly supportingY the several parts. l The upright frames a supportvcross-piveces, al a2, which serve as,guides for the rod 6, which may carry a platen, B, at its lower end, and is threaded through the cross-head so that, as the rod b is turned by a wrench applied at the top, the platen may be operated at diiferent leveis. This modeof adjusting the level at which the press, rod, and platen work, is well known.

D is a bent link, connected at its upper end to the cross-head C by the pin c.

lE F is about lever, fixed on the stout rocking-shaft Gr, mounted in bearings in the framework A, in the l position represented.

The lower end of the stout link D, running down behind the press-frame, is pivoted to the arm E by the pin d, as represented. Turning the arm E downward, into a perpendicular position, draws the cross-head C and its connections do'wn to their lowest position, and the'moveznent increases in leverage or purchase as the movement proceeds.

The means whereby the turning-motion is communicated to the lever E are shown very plainly in gs. 1 and 2. These gnres being sectionsthrough the machine, near its centre, show the parte on one side'only cf the press, it being understood that the parts E D should be duplicated. l

H is a link, connecting the end of the arm F with the arm I, which latter is turned by the hand-lever J, the position being such as to allow a. convenient application of the muscular force to the end of the lever J, and to bring the arm I and the link H nearly lin a straight line at the time when the press is exerting its greatest force,'as indicated in red outline in fig. 2.

By examining iig. 1, it will be seen that when the platen is in its highest position, the link H is not at right angles to the arm I, but that it is considerably inclined in the opposite direction, and it will be seen that when the hand-lever .I is operated to depress the platen, the platen moves rapidly and almost `uniformly during all the earlier portions of the movement, and that it moves slowly and with a greatly-increasing slowness, and consequently increased purchase, during the latter portion of the movement.A

The term toggle is one frequent-ly employed by mechanics to designate a device for increasing mechanical eifect by oblique action, whether the motion be compressive or tensile. With this general definition of the term ltogglc, we may say that my press contains two toggles, peculiarly arranged, and acting the one upon the other.

The rapidity of the motion of the platen during the earlier movement of the hand-lever .I is due to the fact that neither of thc toggles is then at or near its straightened position. The approximately uniform movement of the press-rod for a long period, is due to the fact that the link H is not at right angles to the arm I at the commencement, that it comes into right angles thereto after a portion of themovement, and that there is a period, not at commencement of the movement, but after the hand-lever J has performed about half of its traverse, when the arms are in their best position for transmitting motion rapidly from the arm I through the link H; This peculiar relation, .due to the Obliquity of the linka H, when the platen is fullyraised, may be modified at will changing the position ofthe central-K, where the arm I and `hand-lever J turn. By moving this centre'K nearer to therooking-shaft Gr, the press-rod b will be made to moveirelatively slower at the commencement of its stroke, and faster at the middle of its stroke. By moving the centre K farther away from the rocking-shaft Gr, the press-rod b will be made to move relatively faster at the commencement of the motion of the hand-lever J. The very great slowness ofthe movement of the press-rod during-all ythe last part of the movementof thehand-lever J, is due to the factthat there arein the press two toggles, both nearly'straight, Working one upon theother. This con-dition is indicated in iig.

The arm E, being nearly perpendicular, 'acte in the manner of a toggle 'to draw down the cross-head with great purchase, while the arm I :in d the link H, being in nearly straight line, each with the other, act on the armF, being nearly at right angles with it, to turn it audits connections; with a very great'purehase.

My machine is capable of being m'odied in many of its details, without sacrificing all the advantages of the invention. It is important,` simply, that the parts be so relatedl that while there is a double-toggle power, or tha-t of one toggle'acting upon another so as 'to mnltiplythe' elfeet of one into that of the' other, at the point or period when the press is exerting its` greatest iforoe, there' shall be 'such a relation of the levers and connections, during the early portion of the movement, that the inactionshall not be extremelyquick at the commencement, andrapidly dying away, but shallbe nearly uniform during the main portion of the movement.

v With the proportions which I have tried, andk have endeavored torepresent in the iigures, the first four inches of the travel of lthe hand-lever J give a motion tothe press-rod of one inch. The several succeeding increments, (of four inches'each lof motion of the hand-leven) give motions vto the press-rod b, as follows: One inch, one inch,one'and one-'half inch, one and three-eighths inch, 'one inch, one-half inch, one-eighth inch; the total travel of 'the press-rod being seven and one-half inches, and the whole distance the'hendle travels being thirty-two inches. A

Having now fully described my invention, what I claim as new, and desire to secure by Letters Patent, is as follows `Operating. the press through the instrumentality of two toggles arranged as represented, that is to say, the arm I'operati-ng the arm F' through the link-H, presenting the several `zingt-liar relations at the different periods, as specified, and the motion thus transmitted being lconveyed to 'the press-rod b, and its connectionsthrough' the medium of the arms'E and links D, forming a second toggle, all substantially asland for the purposes herein set forth. f

GEORGE MATTHEWMAN. Witnesses:

THOMAS D. SrETsoN, s C. G. LrvlNes.

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