Hearth cleaning apparatus
US3990836A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 5, 1975 |
| Grant date | Nov 9, 1976 |
| Priority date | — |
| Expiry date | May 5, 1995 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF27B9/30
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A hearth cleaning apparatus includes a wheeled car movable along a floor at the side wall of a reheat furnace wherein metallic workpieces are heated while they are advanced along the furnace hearth. The car is latched to the side wall of the furnace at any one of the normally-closed openings therein. An inverted U-shaped spacer slab is passed through the furnace between two workpieces for access to the hearth. An elongated digging bar which may be cooled by the internal flow of water is supported by the car and advanced through an opening in the side wall of the furnace to engage and loosen slag or other materials adhered to the soaking hearth while exposed by the spacer slab. The car includes a vernier elevation adjustment for the digging bar at the point of support adjacent the furnace and a course elevation adjustment for the digging bar at the opposite end of the car. The digging bar is propelled along the furnace hearth by a pair of pinch rolls. An eccentrically-pointed end on the digging bar is rotated by skewing one of the pinch rolls. A pneumatic hammer is releasably coupled by a gripper arm at any desired location along the digging bar. A position control piston and cylind…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.