Class B21J : FORGING; HAMMERING; PRESSING; RIVETING; FORGE FURNACES
Subclass 7/12: Hammers; Forging machines with hammers or die jaws acting by impact (hand hammers B25D; electrical features section H) Special design or construction with both drive and hammer connected to a fulcrumed lever, e.g. tail hammers the lever being a spring, i.e. spring hammers
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 8997544 | Forming device | Mar 04, 11 | Apr 07, 15 | HINTERKOPF GMBH |
| 7788961 | System and method for ballizing and measuring a workpiece bore hole | Jul 15, 09 | Sep 07, 10 | SEAGATE TECHNOLOGY LLC |
| 7757535 | Punching machine with spring-supported work support | Dec 17, 08 | Jul 20, 10 | TRUMPF WERKZEUGMASCHINEN GMBH + CO. KG |
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