The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 01, 2026
Filed:
Jun. 07, 2021
Ab Sandvik Coromant, Sandviken, SE;
Gunnar Matlik, Sandviken, SE;
AB Sandvik Coromant, Sandviken, SE;
Abstract
A clamping device for releasably holding a tool holder shank includes a spindle rotatably mounted inside a housing, a drawbar axially moveable in a bore in the housing, engagement members moveable under the effect of the drawbar into locking engagement with the tool holder shank, an actuating member slidably mounted to the spindle, a motion transferring mechanism for transferring an axial movement of the actuating member into a movement of the drawbar, and a hydraulic actuator with a piston unit for moving the actuating member. A valve assembly with two parallel and oppositely directed check valves provides a residual hydraulic pressure in a hydraulic chamber of the hydraulic actuator that will affect an automatic return movement of the piston unit after a movement of the drawbar to a retracted locking position.