https://www.datamp.org/ Recently added patents en-us https://www.datamp.org/patents/displayPatent.php?id=85868&pn=1,510,593 Screw driver Patentee: Harvey J. Harrold - Columbiana OH Granted:1924-10-07
Manufactured by Harrold Tool Co. - Columbiana OH

Combination of "sinuous" handle core and "stiff electrically resistant" material for the handle; trade journal listings and "SHOK-PRUF" trademark registration are evidence Harrold put this design into production.
This is one of 85,159 patents currently in the database at datamp.org

]]> https://www.datamp.org/patents/displayPatent.php?id=85867&pn=588 Screw Propeller Patentee: John Ericsson - Lowell, Middlesex County England Granted:1838-02-01

Abstract: This invention which I name as above consists in two thin broad metallic hoops or short cylinders- supported by spiral arms or spokes and made to revolve in contrary directions but at different velocities from each other around a common center, such hoops or cylinders being also placed entirely under the water at the stern of a boat and furnished each with a series of short spiral planes or plates; the plates of each series standing at an_ angle, the exact converse of the angle given to those of the other series and kept revolving by the power of a steam engine whereby a steam boat may be propelled effectually notwithstanding any variation in the draft of water. Claim: The metallic hoops or cylinders and the spiral arms or spokes hereinbefore described together with the entire immersion of the propeller by which means I am enabled to employ the whole surface of all the spiral plates at one time and whereby the beneficial result of a great propelling force will be obtained by a propeller of much less dimensions than heretofore.
This is one of 85,159 patents currently in the database at datamp.org

]]> https://www.datamp.org/patents/displayPatent.php?id=85866&pn=6,844 Steam Engine Patentee: John Ericsson - New York NY Granted:1849-11-06
Manufactured by Massachusetts Caloric Engine Co. - Boston, Suffolk County MA

Abstract: It is a well known fact in the application of steam as a motive power, that the more the principle of expansion is introduced the more economical will be the effect produced, provided some element or elements be not Introduced in the mechanism to counteract it. To give the full effect to this expansive principle of steam either it should be applied to a resistance which decreases in the exact. ratio of the decreasing pressure of the steam by reason of its expansion or dilatation, or what amounts to the same thing the leverage of the connections with the body impelled by this force should increase in the inverse ratio of the decreasing pressure. The ordinary crank engine in general use presents in nearly every particular the reverse of the requirements of this problem, and it would be difficult ,to conceive a mechanism theoretically so ill adapted to the application of this principle, but still from its practical advantages in other particulars it continues in use because of the practical objections to all other plans which have been suggested for overcoming its theoretical defects. Claim: Placing the axis of the crank shaft of single acting beam engines in which the steam is applied expansively nearer to a line parallel to the axis of the cylinder and passing through the axis of vibration of the beam on the principle herein specified, and for the purpose of obtaining a more regular mechanical action on the crank by the application of the expansion principle of steam.
This is one of 85,159 patents currently in the database at datamp.org

]]> https://www.datamp.org/patents/displayPatent.php?id=40530&pn=4,644,831 Adaptor Sleeve Patentee: Miriam Yang - Ta Li Hsiang Taichung Hsien Taiwan Granted:1987-02-24
Manufactured by Klenk Tools - Canton OH

Holder socket, with an internal "U" shaped spring retaining clip. One known example appears on a 1/4" hex-drive flexible shaft extension for screwdriver or nut driver bits. It is marked U.S.A. PAT 4644831 ROC PAT 27181. The patent numbers also appear on the bit holder of KLENK ratcheting bit holders, etc. Subsequent discussion identified some manufacturing and distribution history for KLENK "SELECT-A-BIT": " ... although we have been unable to pin down the exact little shop in Taiwan who was cranking these out, I think it's accurate and reasonable to say they were made IN Taiwan FOR (take your pick) Klenk, Innovative Tools Line (which became part of Klenk) and then later Everhard (after their acquisition of Klenk). Prior pat. nos. 717,199, 853,930, 1,056,848, 2,158,728, 2,677,294, 3,665,791, and 3,935,762 cited as references.
This is one of 85,159 patents currently in the database at datamp.org

]]> https://www.datamp.org/patents/displayPatent.php?id=85865&pn=2,575,630 Plier type tile piercing tool Patentee: Karl J. Klenk - Wilmington DE Granted:1951-11-20

Claims: "A tool for piercing roofing tile and like purposes comprising a pair of hand levers pivotally connected together at their front ends, a pair of leverage members in front of said hand levers, a pivot stud pivotally connecting said members at a point In front of the pivotal connection between the hand levers, said members having leverage extensions projecting rearwardly to the hand levers and pivotally connected with the respective hand levers in back of the pivotal connection between the hand levers, companion piercing jaws in front of the hand levers, one of said piercing jaws being pivotally supported on said pivot stud and having a rearwardly extending portion, a second pivot stud pivotally connecting said rearwardly extending portion with the leverage extension of the adjoining member at a point between the first-mentioned pivot stud and the pivotal connection of the leverage extension of that member with the adjoining hand lever, the other piercing jaw being pivotally fulcrumed on said second pivot stud connecting the first jaw with the leverage extension and a link pivotally connected with said second-mentioned Jaw and pivotally connected with the other hand lever, whereby to effect the closing and opening of said Jaws upon closing and opening movements of said hand levers."
This is one of 85,159 patents currently in the database at datamp.org

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