In the construction of glassware presses it is desirable that the movement of the platen or presser toward the bed shall begin with a rapid, and terminate with a slow but powerful movement; and it is also desirable that this movement shall be effected by means which will operate with so little friction and side thrust that the press will work sensitively, or so that thfe operator can determine, by feeling, the resistance offered just when the pressing should be discontinued ; if the pressing is continued beyond the proper point the mold is injured and the ware spoiled. The press shown in the accompanying engraving has a peculiar combination of devices by which the moving parts of the machine operate to give the platen or presser a motion which changes from a rapid .one at first to a slow but powerful movsment at last, at the same time leaving the press delicate and sensitive in its indication, through the lever, of the resistance offered to a continued pressing movement. In the engraving the parts are shown in the po sition which they occupy previous to making a stroke. The (k)tted lines show the position they occupy when the presser is bronght to its lowest position in making an impression. To the bed. A, are attached two uprights, B, in the top and bottom ends of which are formed guide ways, in which the ends of the crosshead, C, and crossbar, D, can be mude to reciprocate simultaneously, being connected by the links, E. Toggles, made by links, F and G, on each side of the machine, are operated by the movement of the rocker lever, H, connected to the toggles by tho links, I. Each link, F, of each toggle is pivoted to a fixed pivot in each upright, B; and the lower link, G, of each toggle is connected to th*e crossbar, D. The rocker lever, H, is fixed upon the rocker shaft, J, which carries, at the other end, a rocker lever, K, one of the links, I, being coupled to the rocker lever, H, the other to a rocker lever, K\ said links being connected one to each toggle. On the inner surfaces of the uprights, B, are guide was, L, which guide the presser in its reciprocating motion, the presser being connected to the crosshead, C, by the screw hand wheels M, and screw, N, hy which the platen can be ad j listed toward and from the bed to suit various bights of molds. To counterbalance the gravita tion of the moving parts, and thereby increase the sensitiveness of the press, chains, 0, with a weight at one end, pass over the wheels, P, and are attached to the crosshead, C. It will be obvious that the first part of the movement of the lever toward the operator, will rapidly move the platen by straightening the toggles ; and that the movement of the platen, proportionately to the movement of the lever, will grow less and less, and more and more powerful in effect as the toggles approach a straight line. The toggles thrust directly down upon the crossbar, which pulls through the links, E, in a direct line with the crosshead, C, thus avoiding all side thrust and strains on the crossheads and platen, so that the most delicate ware can be made on this press, as well as the heaviest. The friction, as in weighing apparatus, is reduced to a minimum by the system of pivots and centers. The springs for holding the mold in position, shown at Q, are of good length, four in number, and adjustable by the screw hand wheel, K, This press was patented June 8,1869. The presses are manu-fatured by the inventors and patentees, Messrs. Hawes & Horsey, well-known machinists and press builders, of South Boston, Mass., and arepronounced by those who have seen or used them, to be the best machine of the kind ever produced. For rights to build, or for presses, they can be addressed as above. Harvester Cutter Bar Our inventors are latterly turn ing out a series of unusually practical and valuable improvements. The one we now present to our readers, is a device that will save much time, trouble, and expense to farmers, and the convenience of which must be obvious upon even a cursory inspection. The Cutter bar is made of the patent cold rolled iron of Jones and Laughlins, noticed at length on page 50, Vol. XX, SciE:tfTiPic Ameeicak, and is made so that its cross section is of the form made by the intersection of two equal circles. It has not a rivet hole in its entire length—a fact which will be significant enough to farmers, when they recall the points of fracture in the finger bars they have broken in their practice. Upon this bar are slipped the cutters, made in the form shown in detail at the upper part of the engraving. The terminal knife being fastened by a screw, shoulder, or any other suitable means, and the cutter bar being thrust in and held by the set screw. A, all are held firmly, yet any one can be reached and removed with the utmost facility, when occasion requires. Should a cutter bar break, all the knives can be removed, another bar inserted, and the knives replaced in five minutes. But as the shape of the bar and the absence of rivets give great strength with lightness, it is evident that not only will there be less liability to breakage, but the reciprocation of the bar will absorb less power than the old form of bar. The easy removal of the knives is also a great advantage in grinding, obviating any n'ecessity lor special ap-plances for this object. They can be perfectly and easily ground on the ordinary grindstone The inventor informs us that although his patent bears date June 8, 1869, he has already received orders for twenty thousand of these bars. Communications should be addressed to G. L. Du Laney Mschanicsburg, Pa.
This article was originally published with the title "Improvement in Glassware Presses, Harvester Cutter Bar"