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| Number | Title | Issue Date |
| 7377471 | Method and system for opening and securing a railroad frog A method and system are provided for opening and securing a railroad frog. The system is provided with a body member and a plurality of attachment members, which are selectively securable with the body member. The attachment members are structurally configured to se... | 05/27/2008 |
| 7365586 | Hysteresis-type input circuit Hysteresis circuit 10 is composed of three inverters 40, 42, 44. Node NB in hysteresis circuit 10 is connected to the input terminal of transition-detecting part 14 of transmission control part 12. Transition-detecting p... | 04/29/2008 |
| 7121513 | Cross frog for a set of track points, provided with an end of position-retaining device A rail switch frog (1) includes a movable frog point (5) slidingly guided within a base frame (2), which frog point is movable into abutment on the wing rails (6, 7) and laterally supported in its abutment positions by supporting elements... | 10/17/2006 |
| 6286791 | Railroad spring wing frog with hold-open and shock dampening elements An improved railroad trackwork spring wing frog assembly having a selectively releasable hold-open subassembly for the spring wing rail is provided with a combined compressible shock absorber and compression spring that are functionally connected to the a... | 09/11/2001 |
| 6276642 | Railroad spring wing frog assembly A railroad trackwork frog assembly is provided with a base plate, a spring wing rail supported by and movable laterally relative to the base plate, and a hold-down subassembly attached to the spring wing rail and to the base plate, the hold-down subassemb... | 08/21/2001 |
| 6164602 | Railroad frog assembly with multi-position holdback A railroad frog assembly is provided with a spring wing rail multi-position holdback subassembly that continuously retains the spring wing rail in each spring wing rail open position when activated by the wheels of a railcar traversing the frog assembly, ... | 12/26/2000 |
| 6158697 | Railroad frog assembly with latch holdback A railroad frog assembly is provided with a spring wing rail latch holdback subassembly that continuously retains the spring wing rail in a spring wing rail fully open position when activated by the wheels of a railcar traversing the frog assembly, and th... | 12/12/2000 |
| 6138958 | Spring rail frog A spring rail frog includes a movable wing rail, a fixed wing rail and a nose rail. The movable wing rail is provided with a bendable portion and a non-bendable portion. The bendable portion can include any or all of a reduced width base portion, a reduce... | 10/31/2000 |
| 5810298 | Railroad spring frog assembly An improved railroad trackwork spring wing frog assembly is provided with multiple rail-closer subassemblies, preferably of the nested and counter-wound compression spring-type, that co-operate with the assembly spring wing rail, and that are laterally sp... | 09/22/1998 |
| 5806810 | Spring rail frog having switchable magnet for holding wing rail open A railroad frog assembly is provided with a switched magnet that immediately retains a frog flexible wing rail in its open position in response to a railcar wheel passing through the frog assembly, and that delayably releases the frog flexible wing rail f... | 09/15/1998 |
| 5782437 | Spring rail frog having bendable rail with modified cross-section A spring rail frog is disclosed that includes a movable wing rail, a fixed wing rail and a nose rail. The movable wing rail is provided with a bendable portion and a non-bendable portion. The bendable portion can include any or all of a reduced width base... | 07/21/1998 |
| 5595361 | Wing rail hold-down A railroad trackwork spring frog installation having a conventional wing rail with attached wing rail horn fitting is provided with an improved co-operating hold-down comprising a weld block element component, a separate, readily replaceable, riser compon... | 01/21/1997 |
| 5544848 | Railroad spring frog An improved railroad trackwork frog is provided with a relatively fixed rigid wing rail, a relatively movable spring wing rail, a base plate, and at least one roller outrigger and ramp plate assembly which is attached to the spring wing rail and to the ba... | 08/13/1996 |
| 4624428 | Spring rail frog A railroad spring frog assembly for trackwork installations includes a rigid rail and a flexible spring wing rail. The flexible spring wing rail is rigidly affixed between one end which engages a wing point rail and the other end which connects to a closu... | 11/25/1986 |
