https://www.datamp.org/ Recently added patents en-us https://www.datamp.org/patents/displayPatent.php?id=85312&pn=2,029,753 Tool for lapping valve seats Patentee: Herbert A. Berkman - Chicago IL Granted:1936-02-04
Manufactured by ZIM Mfg. Co. - Chicago IL
Assigned to ZIM Mfg. Co. - Chicago IL

ZIM was marketing valve seat reamers and lappers prior to this patent; this patent is for a replaceable "face" for the tool to compensate for wear on the tool. Correspondents provided information about the inclusion of this feature in ZIM valve grinders.
This is one of 85,376 patents currently in the database at datamp.org

]]> https://www.datamp.org/patents/displayPatent.php?id=86089&pn=1,508,033 Wrench Patentee: Thomas B. Tiefenbacher - New York NY Granted:1924-09-09

A friction spring wrapped around the adjusting nut tends to lessen accidental alteration of the adjustment. The drawings show this applied to both "screw adjust" nut and pipe wrenches.
This is one of 85,376 patents currently in the database at datamp.org

]]> https://www.datamp.org/patents/displayPatent.php?id=86088&pn=1,507,494 Pick-head fastener Patentee: William D. Lewis - Plymouth PA Granted:1924-09-02
Manufactured by Howells Mining Drill Co. - Plynouth PA

The patent describes details of a stirrup and wedge holder to attach pick heads and handles. A 1927 trade journal announcement shows the pick produced by Howells Mining Drill Co., Plymouth, PA.
This is one of 85,376 patents currently in the database at datamp.org

]]> https://www.datamp.org/patents/displayPatent.php?id=30546&pn=712,552 Wrench Patentee: Charles M. Lambert - Darke County OH Granted:1902-11-04
Manufactured by Edward C. Tritt - Union City IN
Assigned to Charles M. Lambert - Darke County OH

The wrench portion is a rack and pawl quick adjust nut and pipe combination wrench. The swinging auxiliary handle advances a screwdriver blade, operates the wire cutter, and tightens the grip of the movable wrench jaws. The fixed head has a nail claw and hammer head. Produced as TRITT'S LAMBERT PATENT in black and nickel finishes. Known examples appear with no visible markings. The adjustment mechanism in the movable jaw is slightly different than the one shown in the patent drawing.
This is one of 85,376 patents currently in the database at datamp.org

]]> https://www.datamp.org/patents/displayPatent.php?id=42138&pn=694 Brick Machine Patentees: Stephen Waterman - Charleston, Charleston County SC , Charles Learned - Charleston, Charleston County SC Granted:1838-04-14

Claim: The application of inclined planes to the forcing down the piston for pressing brick in the manner described. We do not claim the mixing, or press boxes, or the oblique knives; these and other parts having been previously known and used; all that we claim as our invention being the inclined planes for forcing down the pistons, and slides, the particular combination and arrangement of the two vertical slides, with their connecting parts, for lifting the piston and causing the molds to traverse upon the ways.
This is one of 85,376 patents currently in the database at datamp.org

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