Title:
CLAMPING DEVICE FOR HYDRAULIC-MECHANICAL TYPE TOOL OR WORK
Document Type and Number:
Japanese Patent JPS62208841
Kind Code:
A
Abstract:
The invention relates to a hydromechanical tool or workpiece clamping apparatus comprising at least one spring clamping cylinder connected to a release conduit and adapted to be hydraulically operated against a spring force to a release position, a pump connected to said release conduit and operable for a release operation, and a discharge conduit extending from said release conduit to a fluid reservoir and including a discharge control element for discharging the pressurized fluid from said spring clamping cylinder to said reservoir after deenergization of said pump. A known clamping apparatus of this type has a solenoid poppet valve disposed in said discharge conduit and operable to close said discharge conduit for the release operation and to be actuated to a flow-through position and maintained therein for the clamping operation. The solenoid valve is expensive and requires separate control means. In contrast thereto, the invention provides the use of a discharge control element in the form of a simple bypass shutter the flow resistance of which at a constant output flow rate of the pump is greater than the pressure required for overcoming the spring force in a release operation.
Inventors:
RUDORUFU BURUNAA
Application Number:
JP3814687A
Publication Date:
September 14, 1987
Filing Date:
February 23, 1987
Export Citation:
Assignee:
HEILMEIER & WEINLEIN
International Classes:
B23B31/30; B23Q3/08; B23Q3/06; B25B1/18; B25B11/00; (IPC1-7): B23Q3/06; B25B1/18
Attorney, Agent or Firm:
Hideto Asamura