Clamping device, especially for rock or concrete drills
AssigneeHydrostress AG
InventorHans Bieri
Life of this patent
Estimating the term…
Abstract
The present clamping device is intended for releasably connecting a driving member, such as a shaft driving a drill bit, in a force transmitting manner to a tubular driven member, such as the boring pipe or tube. A clamping body fits into the free end of the tubular member in a centering manner. The drill shaft may be secured to the centering, clamping body, for example, by a threading. The centering body has a ring groove which receives a clamping ring having a wedging slot extending axially through the clamping ring. A wedge may be forced into the wedging slot by means of a screw, whereby the clamping ring is expanded radially outwardly to connect the centering clamping body to the tubular member.
Claims9
A clamping device for releasably connecting a drive member in a force transmitting manner to a tubular drive member, comprising a centering means concentrically fitting into said tubular drive member, means securing said drive member to said centering means, a ring space in said centering means, clamping ring means located in said ring space, axially extending slot means in said clamping ring means, wedging means axially shiftable in said slot means, clamping screw means cooperating with said wedging means to shift the latter in said slot means whereby said clamping ring means is forced to expand radially outwardly against the inner surface of said tubular driven member when said clamping screw means is tightened.
Dependencies are inferred from the claim text.