US Patent: 5,486X
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| Art of sawing boards and construction of saw mills
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Patentee:
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| Israel Johnson, Jr. (exact or similar names) - Moriah, NY |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
May 07, 1829 |
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Jeff Joslin
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Description: |
| Most of the patents prior to 1836 were lost in the December 1836 fire. Only about 2000 of the almost 10000 documents were recovered. For this patent, only the drawing is available.From the Journal of the Franklin Institute Vol. 5, Aug. 1829 pg. 125:"For improvements in the art of Sawing Boards and other kinds of Lumber, and in the construction of saw mills, crank wheels, and gearing; Israel Johnson, jun., Moriah, Essex county, New York, May 7."1st. The saw frame is to be made lighter than usual, say of 3 by 4 scantling; it is to be framed together by four cross pieces instead of two, the pair at top, and at bottom, to be each about two feet apart, with braces of wood or iron to stiffen them."2nd. The pitman is also to be made light, with a brace from each side extending up to the bottom rail of the saw frame; this rail consequently working on three joints, or noddle pins."3d. The crank wheel is to be balanced, that is, a weight is to be put upon the shaft upon the side opposite to the crank. A very great advantage is anticipated from so doing; as the patentee supposes that much power is lost by having to lift the weight of the crank on one side."4th. Spring poles are to be made to operate upon the pitman. These are greatly to relieve the crank, not only in its labour of passing the dead points, but to co-operate with the power, both in raising and depressing the saw gate, or frame."5th. A veneer saw wedge is to be fixed upon a thin saw plate. This wedge is a strip of iron the length of the saw, and is to be fixed upon that side of it next to the veneer, It is made wedge-shaped, its edge being placed towards the teeth, and its thick part towards the back of the saw. This is to give stiffness to a thin saw, and cause it to run as truly as a thick one. The wedge turns off the veneer, or other thin stuff which is being sawed."6th. A horizontal circular saw running upon a vertical axis is proposed to be used. The description of this is not very clear; but it seems to be intended to cut veneers, &c. from the upper surface of a log placed upon a carriage, or from two logs at once, it being placed between them. A circular veneer saw wedge may be used to give it stiffness."7th. Instead of cog wheels, friction wheels, or rather faced wheels, without teeth, turning each other by their friction, are proposed to be used for saw mills, and other heavy gearing."The claim is to all these, and we fear, therefore, that it is too broad. Cranks have been balanced a thousand and one times; faced wheels to work by their friction are acknowledged not to be new, but are claimed as applied to heavy machinery. Query, at what increase of size does an old contrivance become a new invention? The veneer saw wedge for a straight saw, appears to us to be the best of these arrangements, but if not found in good company, its influence will not be sufficiently redeeming even to save itself from legal condemnation, whatever may be the goodness of its physical properties."k |
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