Hydraulically actuatable crimping device, method for carrying out a crimping operation, method for producing an electroconductive compression joint, electroconductively crimped compression sleeve, method for clamping a workpiece and hydraulic device

Patent metadata

Field	Value
Publication number	US-10468847-B2
Application number	US-201414759765-A
Country	US
Kind code	B2
Filing date	Jan 6, 2014
Priority date	Jan 9, 2013
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

A handheld hydraulically actuatable crimping device includes a hydraulic piston that can be displaced in a cylinder against the force of a spring. The piston is connected to a crimping part by a piston rod in order to carry out a crimping operation. The piston includes first and second partial pistons with first and second partial application faces which can be acted upon with hydraulic medium that has the same hydraulic pressure. Both partial pistons are respectively connected to a first and a second crimping part. The second crimping part can at a greater traveling distance only be acted upon with the second partial piston. The second crimping part can be acted upon with both partial pistons over a first partial traveling distance that is defined by the displacement of the first partial piston from its initial position up to the point, at which it reaches a stop. The first crimping part is axially covered in its entirety by the second crimping part.

First claim

The invention claimed is:

1. A handheld hydraulically actuatable crimping device comprising:
a hydraulic cylinder defining a longitudinal cylinder axis;
a pull-back spring mounted within the hydraulic cylinder;
a hydraulic medium within the hydraulic cylinder;
a hydraulic piston displaceable within the hydraulic cylinder between a starting position and an end position and coaxial to the longitudinal cylinder axis against the force of the pull-back spring,
the hydraulic piston including
a first partial piston having a first partial application face configured to generate a compressive force due to the action of the hydraulic medium under hydraulic pressure acting upon the first partial application face,
a first crimping part connected to the first partial piston,
a second partial piston having a second partial application face configured to generate a compressive force due to the action of the hydraulic medium under hydraulic pressure acting upon the second partial application face,
the first and second partial application faces being acted upon with the hydraulic medium with the same hydraulic pressure from the starting position to the end position, and
a second crimping part connected to the second partial piston; and

a stop provided in the hydraulic cylinder,
wherein the second crimping part can be acted upon with both partial pistons over a first traveling distance that is defined by a displacement of the first and second partial pistons from the starting position to a point where the first partial piston contacts the stop, and
wherein the second crimping part can further travel at a second traveling distance after completion of the first traveling distance when the second crimping part is further acted upon by the second partial piston without further moving the first partial piston.

2. The crimping device according to claim 1 , wherein the first and second partial pistons telescope relative to each other.

3. The crimping device according to claim 1 , wherein the first partial piston forms a second hydraulic cylinder for the second partial piston.

4. The crimping device according to claim 1 , wherein the first partial application face defines a first size, and the second partial application face defines a second size, wherein the first size is smaller than the second size.

5. The crimping device according to claim 1 , wherein the pull-back spring comprises a first pull-back spring and a second pull-back spring, wherein the first partial piston is acted upon by the first pull-back spring and the second partial piston is acted upon by the second pull-back spring.

6. The crimping device according to claim 1 , wherein the first and second crimping parts comprise a crimping die.

7. The crimping device according to claim 1 , wherein the first crimping part defines an outermost radial extent and the second crimping part defines an outermost radial extent which is radially outwardly of the outermost radial extent of the first crimping part.

8. A method configured to produce an electroconductive compression joint comprising:
providing a compression sleeve, the compression sleeve having a constant inside diameter over its length;
providing a crimping device, the crimping device comprising a hydraulic cylinder defining a longitudinal cylinder axis, a hydraulic medium within the hydraulic cylinder, a first partial piston having a first partial application face configured to generate a compressive force due to the action of the hydraulic medium under hydraulic pressure acting upon the first partial application face, the first partial application face defining a first size, a first crimping part connected to the first partial piston, a second partial piston having a second partial application face configured to generate a compressive force due to the action of the hydraulic medium under hydraulic pressure acting upon the second partial application face, the second partial application face defining a second size, and a second crimping part connected to the second partial piston, the first size being smaller than the second size, the hydraulic cylinder having a stop;
providing a first cable and a second cable, each cable having a diameter, wherein the first cable has a smaller diameter than the diameter of the second cable;
crimping an end region of the first cable with a first compressive force to a first location of the compression sleeve using the crimping device by moving the second crimping part over a first traveling distance that is defined by a displacement of the first and second partial pistons from an initial position to a point where the first partial piston contacts the stop, wherein the first and second partial pistons are acted upon by the hydraulic medium having the same hydraulic pressure;
crimping an end region of the second cable to a second location of the compression sleeve using the crimping device by moving the second crimping part over the first traveling distance and further by moving the second crimping part over a second traveling distance by only moving the second partial piston without moving the first partial piston, the second location being adjacent to the first location over the length of the compression sleeve;
wherein the first compressive force is lower than the second compressive force; and
wherein the first and second cables are crimped to the sleeve at locations that lie adjacent to one another over the length of the compression sleeve.

9. A method configured to clamp a workpiece comprising:
providing a hydraulic crimping device comprising a hydraulic cylinder, hydraulic medium within the hydraulic cylinder, a first clamping part in the hydraulic cylinder, a second clamping part in the hydraulic cylinder, a first partial piston in the hydraulic cylinder and connected to the first clamping part, a second partial piston in the hydraulic cylinder and connected to the second clamping part, a first pull-back spring in the hydraulic cylinder and configured to act on the first partial piston, a second pull-back spring in the hydraulic cylinder and configured to act on the second partial piston, the first and second partial pistons configured to be displaced relative to one another in a telescoping fashion in the hydraulic cylinder against the force of the pull-back springs to move the first and second clamping parts;
simultaneously moving the first and second partial pistons and the first and second clamping parts by acting on the partial pistons with hydraulic medium wherein the second clamping part is moved telescopically ahead of the first clamping part to a clamping position to clamp the workpiece, and wherein only the second clamping part contacts the workpiece in the clamping position; and
stopping the partial pistons in the clamping position;
wherein the second clamping part and the second partial piston elastically yield or elastically follow the workpiece during a movement of the workpiece due to the connection of the second clamping part to the first and second partial pistons and as a result of a pressure compensation which takes place via the hydraulic medium because the first partial piston springs back under action of its pull-back spring.

Assignees

• Klauke Gmbh Gustav

Inventors

• Frenken Egbert

Classifications

• H01R4/20 Primary

  using a crimping sleeve {(H01R4/01 takes precedence)} · CPC title

• H01R43/048

  Crimping apparatus or processes (H01R43/042 takes precedence) · CPC title

• H01R43/0427 Primary

  fluid actuated hand crimping tools · CPC title

• Y10T29/49185

  of terminal · CPC title

• Y10T29/53226

  Fastening by deformation · CPC title