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US Patent: 1,297,219
Hot Plate or Platen for Presses
Louis G. Merritt - Lockport, Niagara County, NY

USPTO Classifications:
100/326, 29/890.14

Tool Categories:
woodworking machines : specialty machines : veneer machines
woodworking machines : specialty machines : plywood making machines


Not known to have been produced

none listed

Patent Dates:
Applied: Mar. 18, 1918
Granted: Mar. 11, 1919

Patent Pictures:
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Merritt Machinery
"Vintage Machinery" entry for Merritt Manufacturing Co.
Herbert E. Peck - patent attorney

This invention involves certain improvements in and relating to internally heated platens for presses and the like; and the objects and nature of the invention will be readily understood by those skilled in the art in the light of the following explanation of the accompanying drawings illustrating what I now believe is the preferred mechanical expression or embodiment of the invention from among other forms, constructions and arrangements within the spirit and scope thereof. In the manufacture of so-called plywood and the like, exceedingly powerful presses (often capable of exerting a pressure of five hundred tons) are utilized in applying the necessary heat and pressure to unite sheets of veneer to which glue has been applied. Usually, a series of flat plates or platens internally heated by steam or other suitable medium, is utilized in a single press so that the pressure and heat can be simultaneously applied to a plurality of bundles or piles of veneer sheets at each operative stroke of the press.The press is so constructed that when in normal inoperative position, a plurality of such platens will be supported or upheld in parallelism one above the other and vertically spaced apart to receive piles of veneers in the spaces between the several platens, and so that when the press performs an operative stroke said platens will be forced toward each other to apply the required heat and pressure to the intervening piles of veneers, both flat faces of each platen being thus utilized. Heretofore these hot plates or platens have, in some instances, consisted of solid steel plates having longitudinal and crosswise holes drilled there through to provide for steam circulation between the flat, imperforate side faces of the plates. Such plates were often two inches thick and eight feet long by four feet wide, were not only expensive but required difficult and expensive operations to drill the series of three quarter inch holes eight and four feet long necessary to provide for steam circulation for properly heating the veneer-receiving surfaces of the plates. In other instances, such platens have been built up by riveting together comparatively thin flat facing plates and interposed filling and spacing steel bars and then inserting small steam pipes between said bars. Such a built up platen is composed of two steel face plates each say one half inch thick by four feet wide by eight feet long and these two plates are riveted together over a series of interposed steel bars say three quarters of an inch thick and three inches wide by something less than four feet long and arranged about an inch apart. These bars are necessary to support the thin face plates under the tremendous pressure to which the platens are subjected. Comparatively small steam pipes are then inserted through said spaces between the separator bars to heat said spaces (each of which is approximately four feet long by one inch by three quarters of an inch) and consequently to heat the flat steel face plates. These built up platens are expensive in material and construction, are not of the highest efficiency in utilization of the heat of the heating medium, and involve three separate features, to wit: the face plates, the separator bars, and the steam pipes. It is an object of my invention to produce a fabricated steam or otherwise heated platen for use in such presses as herein before mentioned, that will be exceedingly efficient in utilizing the heat of the steam or other heating medium, that will involves minimum number of features, that can be constructed and assembled at minimum expense, and will be exceedingly strong and durable in construction to withstand the herein before mentioned heavy pressure. A further object of the invention is to provide a platen of this general type wherein the face plate sustaining separator bars are hollow to form the steam pipes and thereby avoid the necessity of employing separator bars and steam pipes as separate and distinct features. A further object of the invention is to provide a platen wherein the steam heating and separator features are embodied in a single element or unitary structure which can be trued up, before being assembled with the face plates, to present accurately parallel opposite flat surfaces of extensive areas for engagement with the inner flat faces of the face plates. A further object of the invention is to pro5 vide platens of the general type mentioned, in the fabrication of which metal face plates and stock metal pipe can be utilized and so combined as to provide extensive areas of heat-conducting direct-contacting surfaces between each pipe and the face plates.

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