Pair of pressing jaws for hydraulic or electric pressing tools

Abstract

The invention relates to a pair of pressing jaws for hydraulic or electric pressing tools for pressing fittings onto pipes or for the press connection of electric cables, two pressing jaws connected to one another in an articulated manner forming a pair of pressing jaws, the pressing jaws being biased into their open position by a tension spring which spans a free space between the two pressing jaws, and in each case one end of the tension spring being accommodated in an accommodating opening which opens out into a narrow peripheral side of the pressing jaw, this narrow peripheral side being directed toward the free space, and, in order to secure the tension spring, a tension-spring end engaging around a pin-like securing part, which securing part is disposed at that end of the accommodating opening which is directed away from the free space. In order to secure the tension spring in a functionally advantageous manner, it is provided that the securing part is formed as an integral crosspiece of the pressing jaw.

Description

[0001] This application is a continuation-in-part of pending U.S. Ser. No. 11 / 534,737, herein incorporated by reference, filed on Sep. 25, 2006, which is a divisional application of U.S. Ser. No. 10 / 884,752 filed on Jul. 2, 2004, herein incorporated by reference, now U.S. Pat. No. 7,216,523. This application claims priority from German Patent Application No. DE 202006013693.2, filed Sep. 7, 2006, herein incorporated by reference. FIELD OF THE INVENTION [0002] The invention relates, to a pair of pressing jaws for hydraulic or electric pressing tools for pressing fittings onto pipes or for the press connection of electric cables, the two pressing jaws being disposed for rotation about a common axis of rotation and each pressing jaw forming a bearing eye for this purpose. BACKGROUND OF THE INVENTION [0003] Pairs of pressing jaws of the type in question are known and are used, inter alia, for pressing fittings onto pipes, particularly in the sanitary sector. Such pairs of pressing jaws ...

AI Technical Summary

Benefits of technology

[0007] With respect to the insulating covering, in order to simplify the handling of such an insulating covering, in particular when it is disposed on a pressing jaw and removed therefrom, it is proposed that the insulating covering, with a substantially C-shaped cross-sectional configuration, has an articulation portion. As a result of this configuration, an insulating covering for a pressing jaw is provided, which has improved handling. The formation of the articulation portion significantly facilitates the operations both of disposing the insulating covering on the pressing jaw and of removing it therefrom. The insulating covering can be adapted more easily over its longitudinal extent, by means of the formation of the articulation portion, to the rounded outer contour of the pressing jaw, in order finally to be secured. The insulating covering has a push-on portion and a clip-on portion, the push-on portion being formed such that it is directed toward that end of the insulating covering which is to be associated with the pressing mouth. The clip-on portion, in contrast, is associated with the back of the pressing jaws. In relation to the longitudinal extent of the insulating covering, the clip-on portion has a length which corresponds approximately to twice to five times, preferably three times, the length of the push-on portion. Those regions of the insulating covering which are adjacent to the articulation portion preferably have a substantially U-shaped cross-sectional configuration, the articulation portion being accompanied by a reduction in cross-section of the U-legs. The length of the U-legs in the articulation portion tends toward zero, so that, in the region of a geometrical articulation axis, the articulation portion is preferably formed just by the U-crosspiece. A widening of the U-crosspiece is further preferably formed in the region of the articulation portion. The widening is provided on both sides, the widened portion of the U-crosspiece, running over the longitudinal extent of the insulating covering, forming an outwardly oriented crosspiece in the region of the adjacent U-legs. The articulation portion is formed eccentrically in relation to the longitudinal extent of the insulating covering, that is to say preferably between the push-on portion and the clip-on portion. In addition to the insulating action, the insulating covering may also possibly serve as rapture protection in the pressing-mouth region. The proposed articulation portion also proves to be advantageous here.

[0010] An integrated securing part gives the advantage of it being possible for the tension spring to be connected to the pressing jaw of a pair of pressing jaws directly and without any further fastening means being used. As an integral constituent part of the pressing jaw, the securing part cannot get lost and, during assembly, fewer individual parts have to be assembled. In order to secure the tension spring, a preferably hook-like end of the tension spring engages around the crosspiece, which runs transversely to the accommodating opening. The crosspiece may run, for example, parallel to the longitudinal extent, or also in the direction of the thickness, of the pressing jaw. The crosspiece preferably has both ends connected to the pressing jaw. It is also possible for the crosspiece only to have one end fixedly connected to the pressing jaw. The securing part can be produced by casting, in conjunction with the production of the pressing jaw (for example in the lost-wax process). It is also conceivable, however, for the securing part to be produced, for example, by a metal removal operation.

Problems solved by technology

These stops preferably interact with the pressing-tool accommodating neck, which is fixed in relation to the pressing jaws, both the open position and the closed position of the pressing mouth, furthermore, being stop-limited as a result of this configuration.

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