Patent ID: 9216501
Filing Date: 2015-12-22
Classification: B25B,B25F,H01R

Abstract:
1. An electro-hydraulic pressing and crimping device for making a tube or crimp connection by moving oppositely disposed press jaws reciprocally toward and away from each other, the pressing and crimping device comprising: a pressure piston comprising a head element and a valve chamber, wherein the head element provides a piston interior and a sealing seat; a piston chamber, wherein the pressure piston is disposed in the piston chamber, and wherein the pressure piston divides the piston chamber into a pressure chamber and a return chamber; a hydraulic fluid reservoir; a hydraulic pump disposed in communication with the hydraulic fluid reservoir, wherein the hydraulic pump conveys hydraulic fluid from the hydraulic fluid reservoir into the pressure chamber, wherein the hydraulic fluid entering the pressure chamber moves the pressure piston toward the press jaws, and wherein the movement of the pressure piston toward the press jaws moves the press jaws reciprocally towards each other to effect pressing and crimping of the tube or crimp connection; a return spring disposed in the return chamber, wherein the return spring reverses movement of the pressure piston after a switch-off pressure indicating completion of the pressing and crimping operation has been reached; a connection channel that provides fluid communication between the piston interior and the valve chamber; an overpressure valve disposed in the valve chamber, wherein the overpressure valve comprises a needle that is moveably disposed in relation to the connection channel, wherein the needle closes the connection channel during the pressing and crimping operation and opens the connection channel when the switch-off pressure has been reached; a connection opening disposed in fluid communication between the pressure chamber and the piston interior; a return flow channel disposed in fluid communication between the pressure chamber and the rear chamber; and a balance piston having a front side proximal the connection opening and a rear side distal the connection opening, wherein the front side closes the connection opening and the return flow channel until the switch-off pressure has been reached.