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Description: |
| Most of the patents prior to 1836 were lost in the Dec. 1836 fire. Only about 2,000 of the almost 10,000 documents were recovered. Little is known about this patent. There are no patent drawings available. This patent is in the database for reference only.
“Specification of a patent for a new mode of combining the power of the Lever and the Pulley, in the Standing Press. Granted to GEORGE W. GRATER, of Boston, Massachusetts, October 1, 1830, and assigned by him to LEMUEL BLAKE, of the same place.
To all whom it may concern, be it known, that I, George W. Grater, of Boston, in the state of Massachusetts, have invented a new mode of combining the powers of the lever and the pulley, in the standing press, for pressing articles of various kinds; which press is intended to be used as a substitute for the ordinary lever, screw, and hydrostatic presses; and that the following is a full and exact description of the same.
I make a strong frame, which may consist of cheeks, properly united by cross pieces, with mortises and bolts, in the manner common in screw presses; or, instead of cheeks, I use four strong corner posts, mortised into sills, and having such cap and cross pieces, or ties, framed into them, as may be deemed necessary. This latter mode I prefer, and it is the one which is represented in the drawing deposited in the patent office. The bed of the press I usually place near the upper part of the frame, or cheeks, bolting, and otherwise securing it firmly thereto; the follower being suspended below, by the tackle, in the manner to be presently described.
Across the top of the frame, or cheeks, and extending from side to side, I affix a strong iron axle, turning upon gudgeons, in suitable boxes; upon this axle, and usually near its middle, I place an iron toothed wheel, and on each side of this wheel, cylindrical pieces of wood, or other material, around which the rope to be used is to wind in the operation of the press. A second axle is placed parallel to the former, having upon it a pinion or small toothed wheel, which takes into the former; there is also fixed upon this axle, a round block, or hub, with mortise holes, to receive the end of the lever, or hand spike, which is to operate upon this compound windlass. Ratchets and palls are employed in the usual manner. At each end of the bed, and of the follower, and attached thereto, I place two, three, or more sheeves, or pulleys; the ends being notched out to receive them, and a bolt upon which they are to turn, passing through, or on one side of the bed and follower. For the purpose of obtaining the greatest strength, it will be best to secure these bolts, by staples, on the upper side of the bed, and on the lower side of the follower, instead of passing them through their substance.
The press, as before described, is now ready for the reeving of the rope, which is thus effected. A single rope is taken and passed under the follower towards the back part thereof, the two ends being brought up through openings left in the ends of the follower for that purpose; they are then passed over the two back pulleys of the bed, and under the two of the follower, and successively around the remaining pulleys, until they pass up from the last pulley on the front of the follower; the two ends are now secured, one on each of te cylindrical pieces of the first named axis, when the press is ready for use. In order to preserve an equal tension in the rope, that part of it which passes under the bed is sustained by friction rollers.
The operation of the press is now manifest, as it is similar in principle to that of an ordinary tackle, operated upon by a windlass. In order to sustain any part of the articles in press at any required height, holes are bored through the cheeks, or uprights, into which rods, or pins, may be inserted, so that any part may be taken out and renewed without taking out the whole.
If it be thought best to have the bed below, and the follower above, this may be effected by reversing the whole arrangement; but in this case the weight of the follower and of its appendages, must be counterpoised, by extending a rope from each end of it, passing over a pulley above, and so loaded as to sustain it in its place.
Presses operated on by means of a windlass and tackle, have been heretofore made, but they have been inconvenient in use, in consequence of the arrangement of the parts. I do not, therefore, claim a lever and tackle press, generally, but what I claim as constituting my invention, is the manner in which the rope is reeved over the pulleys attached to the bed and follower, as described in the foregoing specification.
It will be obvious that where continued pressure is required, a weight may be allowed to remain suspended upon the end of the lever, which added to the elasticity of the ropes, will produce a powerful continued effect. It may likewise be observed that chains may, in certain cases, be substituted for the rope.”
Journal of the Franklin Institute, Dec., 1830, pg.377
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