Method of operating a hydraulic pressing unit, and hydraulic pressing unit

• US 20030126905A1
• Filed: 12/12/2002
• Published: 07/10/2003
• Est. Priority Date: 12/13/2001
• Status: Active Grant

• Current Assignee: Gustav Klauke GmbH (Emerson Electric Company)
• Original Assignee: Gustav Klauke GmbH (Emerson Electric Company)
• Inventors: Frenken, Egbert
• Granted Patent: US 6,769,356 B2
• Time in Patent Office: Days
• US Class Current: 72/453.16
• CPC Class Codes: B21J 15/20 operated by hydraulic or liquid pressure
• CPC Class Codes: B25B 27/10 inserting fittings into hoses
• CPC Class Codes: F15B 11/028 for controlling the actuating force F15B11/024 takes precedence
• CPC Class Codes: F15B 15/204 Control means for piston speed or actuating force without external control, e.g. control valve inside the piston F15B11/02, F15B15/22 take precedence
• CPC Class Codes: F15B 2211/30505 Non-return valves, i.e. check valves
• CPC Class Codes: F15B 2211/40515 with variable throttles or orifices
• CPC Class Codes: F15B 2211/411 the positions being discrete
• CPC Class Codes: F15B 2211/423 manually, e.g. by using a lever or pedal
• CPC Class Codes: F15B 2211/426 electrically or electronically
• CPC Class Codes: F15B 2211/473 without restriction in the reverse direction
• CPC Class Codes: F15B 2211/50536 using unloading valves controlling the supply pressure by diverting fluid to the return line
• CPC Class Codes: F15B 2211/55 for limiting a pressure up to a maximum pressure, e.g. by using a pressure relief valve
• CPC Class Codes: F15B 2211/7052 Single-acting output members
• CPC Class Codes: F15B 2211/76 Control of force or torque of the output member
• CPC Class Codes: F15B 2211/7716 with automatic return

Abstract

The invention relates to a method of operating a hydraulic pressing unit, in particular manual pressing unit, and a pressing unit of this type, it being the case that the pressing unit has a hydraulic pump, a moving part, a stationary part and a non-return valve, that, furthermore, the moving part is displaced into a pressing position by the build-up of a hydraulic pressure and the non-return valve moves automatically into an open position only in the presence of a predetermined hydraulic pressure corresponding to a pressing pressure, and that, furthermore, the moving part is configured for moving back automatically from the pressing position into an end position under the action of a restoring spring and the non-return valve is configured only to close once the moving part has reached the end position. In order to allow the moving part to be stopped optionally in position, the invention proposes, as far as the method is concerned, that the non-return valve is subjected to the action of a closure force, which is necessary for achieving the optional stopping in position of the moving part [lacuna] as the moving part moves back, when a pre-selected return position or a predetermined return position of the moving part is reached. It is advantageous here if it is possible to stop the return of the moving part before it reaches the end position by a triggering device, acting on the non-return valve. The open position of the non-return valve may also be arrested until a predetermined return position of the moving part has been reached.

Claims

1. A method of operating a hydraulic pressing unit, in particular manual pressing unit, it being the case that the pressing unit has a hydraulic pump, a moving part, a stationary part and a non-return valve, that, furthermore, the moving part is displaced into a pressing position by the build-up of a hydraulic pressure and the non-return valve moves automatically into an open position only in the presence of a predetermined hydraulic pressure corresponding to a pressing pressure, and that, furthermore, the moving part is configured for moving back automatically from the pressing position into an end position under the action of a restoring spring and the non-return valve is configured only to close once the moving part has reached the end position, wherein the non-return valve is subjected to the action of a closure force, which is necessary for achieving the optional stopping in position of the moving part [lacuna] as the moving part moves back, when a pre-selected return position or a predetermined return position of the moving part is reached.

2. The method as claimed in claim 1 or in particular as claimed therein, wherein the non-return valve is arrested mechanically in the open position.

3. The method as claimed in one or more of the preceding claims or in particular as claimed therein, wherein magnetic arresting is carried out.

4. The method as claimed in one or more of the preceding claims or in particular as claimed therein, wherein electromechanical arresting is carried out.

5. A hydraulic pressing unit, in particular a manual pressing unit, it being the case that the pressing unit has a hydraulic pump, a moving part (4), a stationary part and a non-return valve (1), that the moving part (4) can be displaced into a pressing position by the build-up of a hydraulic pressure and the non-return valve (1) moves automatically into its open position only in the presence of a predetermined hydraulic pressure corresponding to a pressing pressure, and that the moving part (4) is configured for moving back automatically from the pressing position into an end position under the action of a restoring spring and the non-return valve (1) is configured only to close once the moving part (4) has reached the end position, wherein it is possible to stop the return of the moving part (4) before it reaches the end position by a triggering device, acting on the non-return valve (1).

6. The pressing unit as claimed in claim 5 or in particular as claimed therein, wherein the triggering device comprises a pulling or pushing part connected to the non-return valve (1).

7. The pressing unit as claimed in one or more of claims 5 and 6 or in particular as claimed therein, wherein an electromagnet acts on the non-return valve (1).

8. The pressing unit as claimed in one or more of the preceding claims 5 to 7 or in particular as claimed therein, wherein the non-return valve is subjected to the action of a prestressing force which is sufficient for displacement into the closed position at any point in time at which the moving part is moving back.

9. The pressing unit as claimed in one of the preceding claims 5 to 8 or in particular as claimed therein, wherein the open position of the non-return valve is arrested until a predetermined return position of the moving part has been reached.

10. The pressing unit as claimed in one of the preceding claims 5 to 9 or in particular as claimed therein, wherein the open position of the non-return valve (1) is arrested mechanically.

11. The pressing unit as claimed in one of the preceding claims 5 to 10 or in particular as claimed therein, wherein provided for the purpose of disengaging the arresting protrusion is a separate disengaging part, which moves the arresting protrusion out of the latching socket.

12. A hydraulic pressing unit having a hydraulic pump, a moving part (4) and a stationary part (9) and a non-return valve (6), it being the case that the moving part (4) moves from a starting position into a pressing position, the non-return valve (6) moves automatically into an open position in dependence on a hydraulic pressure corresponding to the pressing pressure, and the moving part (4) moves back under the action of a restoring spring (5), wherein the open position of the non-return valve (6) is arrested until a predetermined return position of the moving part (4) has been reached.

13. The pressing unit as claimed in claim 12 or in particular as claimed therein, wherein the non-return valve (6) has a latching socket (26) in which an arresting protrusion (8) engages for the arresting operation.

14. The pressing unit as claimed in one or more of the preceding claims 12 and 13 or in particular as claimed therein, wherein the arresting protrusion (8) is forced into the arresting position under spring prestressing.

15. The pressing unit as claimed in one or more of the preceding claims 12 to 14 or in particular as claimed therein, wherein a separate disengaging part (11) is provided and moves the arresting protrusion (8) out of the latching socket (26).

16. The pressing unit as claimed in one or more of the preceding claims 12 to 15 or in particular as claimed therein, wherein the disengaging part (11) interacts with a ramp of the arresting protrusion (8).

17. The pressing unit as claimed in one or more of the preceding claims 12 to 16 or in particular as claimed therein, wherein the moving part (4) can act on the disengaging part (11).

18. The pressing unit as claimed in one or more of the preceding claims 12 to 17 or in particular as claimed therein, wherein the moving part (4) is a piston, and wherein the disengaging part (11) projects into the displacement path of the piston.

19. The pressing unit as claimed in one or more of the preceding claims 12 to 18 or in particular as claimed therein, wherein the disengaging part (37) is forced into its disengagement position under spring prestressing, and wherein the spring prestressing is exceeded by the hydraulic pressure which prevails during pressing and return of the moving part (4).