Home| FAQ Search:Advanced|Person|Company| Type|Class Login
Quick search:
Patent number:
Patent Date:
first    back  next  last
US Patent: 27,021
Joseph H. Jenkins - Smithville, MO

USPTO Classifications:
83/701, 83/776

Tool Categories:
woodworking machines : reciprocating saws : reciprocating sawmills
woodworking machines : sawmills : reciprocating sawmills

Elijah W. Jenkins - Smithville, MO

Not known to have been produced


Patent Dates:
Granted: Jan. 31, 1860

Patent Pictures: [ 1 | 2 ]
USPTO pdf tiff
Google Patents
Report data errors or omissions
From Scientific American: "'I claim the employment of the armed rockshaft, I, pitman, H, eccentric, G, and hinged swinging frame, L, in combination with a reciprocating saw sash, in the manner and for the purpose described.' This invention consists in the arrangement specified in the above claim, whereby the saw, although it is thrown off from the log and made to assume an inclined position as it ascends, is brought against the log and made to retain a perpendicular position while it is descending. Heretofore, in sawmills, this end has not been attained, because the eccentrics which are used to pitch the saw from and toward the log have not been combined with a controlling and compensating frame such as Mr. Jenkins employs, and, consequently, they have been allowed to incline the saw just as much in its descending movement as they are allowed to incline in its ascending movement. It is desirable to have the saw inclined as it rises in order to clear the log; but it is not desirable to have it inclined as it descends, because, if it is inclined at this stage of the operation, the saw will not come in contact with the log until considerable of its lower portion has passed down below the log, and thus the action of said portion of the saw on the log lost. This appears to be a very clever arrangement."

Copyright © 2002-2020 - DATAMP