DE10200258B4 - Press lever, for power-driven press tools - Google Patents

Abstract

Press levers for power-driven press tools, in which the press levers (1, 15) are arranged in pairs and have two arms and have pivot axes (A), on one side of which a work surface (8) for the pressing process and on the other side of which a control surface (7 ) are arranged for moving the work surfaces (8) against one another, characterized in that the press levers (1, 15) are provided with plastically and / or elastically deformable inserts (14) and / or supports (16}.

Description

The invention relates to press levers for power driven dies, in which the press levers are arranged in pairs and have two arms are and have pivot axes, on one side of each a work surface for the pressing and on the other side a control surface for each other Moving the work surfaces are arranged.

A replaceable press head with such two-armed press levers is through DE 44 46 504 C1 known. It is used for the radial and permanently tight pressing of pipe connections and press fittings, e.g. B. in the sanitary and heating sector. Such press levers are exposed to pressing forces in the barrel area and generally consist of drop-forged, hardened and tempered steel alloys. The known solution was to compensate for excessively large pressing forces and surface pressures in that, using the lever laws, pincer jaws of small diameter are arranged at a greater distance from the pivot axes and - conversely - pincer jaws of large diameter at a smaller distance from the pivot axes. This counteracts to a certain extent a risk of breakage; but it is not completely excluded.

Now in exceptional cases it can Incorrect operation and / or when replacing the replaceable press head on inadmissible engines high driving forces occur that the press lever due to excessively high leverage due to overload break. As already after partial grouting of the pipe connections and press fittings due to partially elastic deformation with restoring forces in these connections significant energies are stored in the event of a break the press lever is released suddenly there is a risk a flying around of the sharp-edged fragments and an injury to the Operator or in the vicinity of people or also "only" damage to property.

The invention is therefore the object the basis, press lever of the type described above to improve that im In the event of a break in the press lever, no fragments in the Flying around.

The solution to the task takes place according to the invention in the press levers specified at the outset by that the Press lever with plastically and / or elastically deformable inserts and / or Conditions are provided.

Through this measure (s), the task at hand Solved in full: In the event of a break in the press lever, no fragments of the Fly press levers around; rather, they are reliable through the plastically and / or elastically deformable inlays and / or overlays held on the press head and on the engine. The one or Requirements absorb at least part of the energy released.

The subject of the invention is not to a certain type of drive and to a certain embodiment of line connectors and press fittings limited, Rather, it can be used universally, especially for repairs of press heads and / or for retrofitting.

• – sich die Einlagen und/oder Auflagen über beide Seiten der Schwenkachsen erstrecken,
• – sich die plastisch und/oder elastisch verformbaren Einlagen und/oder Auflagen zusätzlich über die Arbeitsflächen erstrecken,
• – die Arbeitsflächen zweier Pressenhebel ein Zangenmaul für das radiale Verpessen von Rohrverbindungen bilden,
• – die Einlage aus einem Stahlseil besteht, das in oberflächennahen Bohrungen des jeweiligen Pressenhebels festgelegt ist,
• – die Einlage in der Mittenebene des Pressenhebels angeordnet ist,
• – die Auflage aus einem elastisch verformbaren Streifen eines elastomeren Werkstoffs besteht, der auf der Außenseite eines jeden Pressenhebels festgelegt ist,
• – die Auflage aus einem plastisch und/oder elastisch verformbaren Streifen eines metallischen Werkstoffs besteht, der auf der Außenseite eines jeden Pressenhebels festgelegt ist,
• – die Festlegung der Einlage und/oder der Auflage durch Verkleben durchgeführt ist, und/oder, wenn
• – die Festlegung der Einlage und/oder der Auflage durch Stifte durchgeführt ist.

In the course of further refinements of the invention, it is particularly advantageous if either individually or in combination:

• The deposits and / or supports extend over both sides of the swivel axes,
• The plastically and / or elastically deformable inlays and / or overlays additionally extend over the work surfaces,
• - the working surfaces of two press levers form a jaw for the radial pressing of pipe connections,
• - the insert consists of a steel cable which is fixed in the holes near the surface of the respective press lever,
• The insert is arranged in the center plane of the press lever,
• The support consists of an elastically deformable strip of an elastomeric material which is fixed on the outside of each press lever,
• The support consists of a plastically and / or elastically deformable strip of a metallic material which is fixed on the outside of each press lever,
• - The definition of the insert and / or the edition is carried out by gluing, and / or if
• - The definition of the insert and / or the support is carried out by pins.

Two exemplary embodiments of the subject matter of the invention and their modes of operation are described below with the aid of 1 and 2 explained in more detail.

Show it:

1 a partially sectioned side view of a first embodiment of a press lever and

2 a partially sectioned side view of a second embodiment of a press lever.

In 1 is a two-armed press lever 1 shown, which is pivotally mounted about a pivot axis A in a holder, not shown here. The storage is done by one. likewise not shown hinge pin through a hole 2 is inserted, which defines the pivot axis A. Two such press levers form a press head together with the holder, which is placed on an engine with an electrical or electrohydraulic drive by means of the holder. This machine has a stamp with two spreading rollers 3 , of which only one is shown here. The direction of advance of the spreading rollers 3 is through the arrow 4 indicated. The press levers 1 are hardened drop forgings.

The press lever has on both sides of the swivel axis A 1 a first lever arm on the machine side 5 and a second lever arm remote from the machine 6 , The inside of the first lever arm 5 has a control surface 7 for unrolling the spreading roller 3 , and the inside of the second lever arm 6 forms a work surface 8th , which is adapted to the final shape of a pipe joint to be pressed or a so-called press fitting. Two such work surfaces 8th form a pliers mouth 9 , Inside the first lever arm 5 is also a hole 10 arranged, which receives one end of an expansion spring, not shown. The arrangement on both sides of a plane of symmetry E can be imagined as mirror-symmetrical. Such a press head is in the aforementioned DE 44 46 504 C1 shown and described.

A weak point of such press levers 1 is for example a virtual area through the holes 2 and 10 runs and from the hole 2 to the closest position on the outside 11 of the press lever 1 , Another vulnerability is a virtual surface that is off the work surface 8th goes out and between the far end of the second lever arm 6 and the outside 11 runs.

To now if the press lever breaks 1 To prevent fragments from flying around are near the outside 11 in the center plane two holes at an obtuse angle to each other 12 and 13 arranged in which a deposit 14 in the form of a section of a steel cable, for example made of stainless steel.

This deposit 14 extends - as shown - over all suspected vulnerabilities. The insert is useful 14 with the walls of the holes 12 and 13 bonded.

The 2 shows a press lever 15 with a different type of break protection. Otherwise the previous reference numbers are used. The outside is for the same purpose 11 of the press lever 15 with one edition 16 in the form of a strip of spring steel, soft iron or plastic, which - as shown - stretches across all suspected weak points and that with pins 17 with the press lever 15 Alternatively or additionally, the edition can be connected 16 with the press lever 15 be glued.

Through the deposits 14 or requirements 16 all parts of the press levers 1 and 15 reliably held together even in the event of a break.

1

Press lever

2

drilling

3

spreader

4

arrow

5

first lever arm

6

second lever arm

7

control surface

8th

working surface

9

beaks

10

drilling

11

outside

12

drilling

13

drilling

14

inlay

15

Press lever

16

edition

17

pencils

A

swivel axis

e

plane of symmetry

Claims (10)

Press levers for power-driven press tools, in which the press levers ( 1 . 15 ) are arranged in pairs and have two arms and have swivel axes (A), on each side of which a work surface 8th ) for the pressing process and on the other side a control surface ( 7 ) for moving the work surfaces against each other ( 8th ) are arranged, characterized in that the press lever ( 1 . 15 ) with plastically and / or elastically deformable inserts ( 14 ) and / or requirements ( 16 } are provided. Press lever according to claim 1, characterized in that the inserts ( 14 ) and / or requirements ( 16 ) extend over both sides of the swivel axes (A). Press lever according to claim 2, characterized in that the plastically and / or elastically deformable inserts ( 14 ) and / or requirements ( 16 ) additionally over the work surfaces ( 8th ) extend. Press lever according to claim 1, characterized in that the working surfaces ( 8th ) two press levers ( 1 . 15 ) a pliers mouth ( 9 ) for the radial pressing of pipe connections. Press lever according to claim 1, characterized in that the insert ( 14 ) consists of a steel cable which is drilled in near-surface holes ( 12 . 13 ) of the respective press lever ( 1 ) is set. Press lever according to claim 5, characterized in that the insert ( 14 ) in the center plane of the press lever ( 1 ) is arranged. Press lever according to claim 1, characterized in that the support ( 16 ) consists of an elastically deformable strip of an elastomeric material, which is on the outside ( 11 ) of each press lever ( 15 ) is set. Press lever according to claim 1, characterized in that the support ( 16 ) consists of a plastically and / or elastically deformable strip of a metallic material, which is on the outside ( 11 ) of each press lever ( 1 ) is set. Press lever according to at least one of claims 1 to 8, characterized in that the fixing of the insert ( 14 ) and / or the edition ( 16 ) is done by gluing. Press lever according to at least one of claims 1 to 8, characterized in that the fixing of the insert ( 14 ) and / or the edition ( 16 ) with pins ( 17 ) is carried out.