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US 4,992,010 AGranted
Device for forming an undercut in a drilled hole
Assigneefischerwerke Artur Fischer GmbH & Co. KG
InventorArtur Fischer
Life of this patent
Estimating the term…
Abstract
A device for forming an undercut in a drilled hole comprises a stem having a pivotal reaming element at a lower end thereof, and a guide tube in which the stem is longitudinally displaceable with the reaming element pivoting radially outwards from the guide tube in a lower end position of the stem.
Claims7
A device for forming an undercut in a drilled hole in masonry, comprising a stem having an upper portion to be clamped in a drilling machine and a lower portion and having upper and lower end positions;
- a reaming element arranged at said lower end portion of said stem and having a cutting edge;
- a guide tube in which said stem is displaceable between the upper and lower positions thereof, said reaming element pivoting radially outwards out of said guide tube with said cutting edge projecting laterally from said guide tube upon displacement of said stem to the lower end position thereof;
- and a compression spring surrounding said guide tube and biasing said stem into the upper end position thereof, said guide tube having slot means at an upper end thereof and a ring spaced from said slot means, said stem being provided with a transverse pin extending through said slot means, said compression spring extending between said transverse pin and said ring.
Dependencies are inferred from the claim text.