Claims
- 1. An apparatus for spalling a surface from a concrete object comprising:
- an elongated tubular-shaped body having a wall, a longitudinal axial passageway through the body forming an inner face and two ends, a relatively short section at one end having a solid wall to form a handle end for gripping the body, and a circular wedge-shaped spalling edge at the opposite end, extending outward from the wall to form a spalling end, the spalling edge being perpendicular to the longitudinal axis of the body, at least three longitudinal slots in the wall, evenly spaced around the circumference of the wall extending from the spalling end to the handle, to form at least three longitudinal wall segments extending from the handle, each segment having a short relatively thin-walled portion where it extends from the handle whereby the segments are bendable resiliently outward at the handle to form an expandable section, a short outward taper in the inner surface of each wall segment at the spalling end; and
- a tapered mandrel extending from the spalling end of the body, the mandrel having a large end outside the body and a small end in the axial passageway and a long shaft slidably located in the axial passageway having one end attached axially to the small end of the mandrel and a free end extending from the handle end of the body for imparting longitudinal movement to the mandrel, the taper of the mandrel matching the short outward taper on the inner surface of the spalling end, so that pulling the shaft longitudinally through the body will force the mandrel against the short outward taper bending the wall segments outward, thereby expanding the expandable section whereby inserting the spalling end of the apparatus into a hole in the surface layer of concrete and expanding the expandable section will force the wedge-shaped spalling edge outward into contact with the wall of the hole, continued expansion forcing the spalling edge into the wall to break the layer from the object, spalling the surface layer from the object.
CONTRACTUAL ORIGIN OF THE INVENTION
The invention described herein was made in the course of, or under, a contract with the U.S. DEPT. OF ENERGY.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
345696 |
Hudson et al. |
Jul 1886 |
|
900003 |
Veitch |
Sep 1908 |
|
3565488 |
Walsh |
Feb 1971 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
2630091 |
Jan 1977 |
DEX |