Abstract:
A press device to be modified such that profile rods can also be removed by a shearing movement. The tool is configured so that a cutting plate can be fixed to each pivoting arm and is displaceably mounted in the opposite pivoting arm. The clamping arms of the pivoting arms have a fork-shaped slit and the cutting plates are maintained in the clamping arms with fixing bolts.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   This invention relates to a pressing apparatus which is suitable for pressing coupling elements, and having a fork-like receiver. 
   2. Description of Prior Art 
   A known pressing apparatus has a fork-like receiver in which an exchangeably held tool is held by a connection bolt. A tool may be inserted into the fork-like receiver, and the tool has two pivot arms which may be moved towards one another and which between two carrier plates may be individually pivoted towards one another about a bearing bolt. The bearing plates which mostly have a roughly T-shaped design, apart from the bores in which the bearing bolts engage, each have a third bore through which the connection bolt engages when the tool is inserted into the fork-like receiver. The pressing apparatus has electromotorically or hydraulically actuated pressing rollers which bear on the two flanks of the two pivot arms, the flanks being directed towards one another, and thus in this region press the two pivot arms apart, wherein the regions in front of the two bearing bolts move towards one another. 
   The known pressing apparatus has been brought onto the market with much success. They are preferably for pressing the coupling elements together and thus for connecting two parts to one another. Known, mostly cylindrical coupling elements, for example press sleeves, press fittings or tube muffs are also tube sections which are inserted directly into one another. Accordingly, these pressing apparatuses are quite widespread in housing installations. Such apparatuses are particularly applied when installing heating installations, plumbing (sanitary) installations and gas conduit installations. The fitters who operate with these apparatus in each case exchange the tool held, depending on the nature of the connections to be created and the dimensions of the connections to be created. 
   The two European Patent References EP-A-0 712 696 and EP-A-0 941 813 are referred to for the design of the apparatus being considered. Tools which may be actuated with such pressing apparatus are described by German Patent Reference DE-U-29703053 and by European Patent Reference EP-A-1 114 698. The corresponding patent literature for the pressing apparatus as well as the tools is thorough. 
   The fitters who work with these apparatus not only need to create connections but must also assemble the corresponding conduits to the walls or in installations, to suitable frameworks of the installation. For this purpose widespread materials are used which remain the same in the individual fields. Thus the fitters for plumbing installations use a U-shaped profile on which the conduits may be attached and positioned differently in a horizontal or vertical manner. Furthermore, for assembly, another rod-like material is used, for example metal rods or threaded rods. Finally, smaller auxiliary materials often need to be used which need suitable elongated holes. Thus it becomes quite awkward if one requires additional machines for all these auxiliary tasks, which need to be supplied via conduits and leads and which despite this often accomplish the desired activities with little precision or with considerably much more effort. 
   SUMMARY OF THE INVENTION 
   It is one object of this invention to provide fitters and mechanics active at different locations with an apparatus which may be equipped with suitable tools with which one may carry out the most varied of tasks. 
   A pressing apparatus with the features set forth in this specification and in the claims achieves the above object. The shear plates may either have a design with the shape of guides of a profile to be cut off, as in one embodiment, or the two shear plates may also have several traversing round holes in order to be cut to length rod material with various diameters. It is also possible to design the two shear plates as a female and male die, so that the same press apparatus may be used for punch work as, for example, is suitable for forming elongated holes. 
   Other embodiments can be deduced from the claims and the specification and their significance and functioning are explained in the subsequent description with reference to the drawings. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The drawings show different embodiments, wherein: 
       FIG. 1  shows a perspective view of a known pressing tool and a pressing clamping pincer capable of being applied therein; 
       FIG. 2  shows a front view of the known press clamping pincer; 
       FIG. 3  shows a front view of a tool according to this invention which can be applied into the known apparatus, in an opened condition with applied shear plates; 
       FIG. 4  shows a front view of the same tool, but in the actuated condition, as in  FIG. 3 ; 
       FIG. 5  shows a side view of the tool according to  FIGS. 3 and 4 ; 
       FIGS. 6 and 7  show front views of the two shear plates on their own; 
       FIG. 8  shows a front view of a tool with applied shear plates, in an open position; 
       FIG. 9  shows a front view of the tool shown in  FIG. 8 , but in an actuated condition; 
       FIG. 10  shows a side view of the tool shown in  FIG. 8 ; 
       FIGS. 11 and 12  show front views of the two shear plates running towards one another; 
       FIG. 13  shows a front view of an open tool with an inserted punch unit, having a female die and a male die; 
       FIG. 14  shows a front view of the tool as shown  FIG. 13 , but in a closed condition; 
       FIG. 15  shows a side view of the tool shown in  FIG. 13 ; 
       FIG. 16  shows the male die in a plan view; 
       FIG. 17  shows a side view with a view of the punch; 
       FIG. 18  shows a plan view of the female die fitting with the male die, according to  FIG. 16 ; and 
       FIG. 19  shows a side view of the female die in a lateral view, with a view of the punch receiver. 
   

   DESCRIPTION OF PREFERRED EMBODIMENTS 
   The pressing apparatus indicated at  1  is shown in a perspective representation in  FIG. 1 . Such pressing apparatuses are most operated electrically either from a main voltage or by a battery. For this, a suitable electric motor is present in the drive housing  2 , which either mechanically by way of a spindle or hydraulically by way of a pump and a piston-cylinder unit may push forwards or pull back suitable pressing rollers. With a suitable battery-operated apparatus the battery is often accommodated in the handle  3 . A receiver  4  is connected to the drive housing  2 . A connection bolt  5  passes through the fork-like receiver  4 . The fitter or assembler working with the pressing tool selectively applies a tool  10  into the receiver, for which the fitter or assembler removes the secured connection bolt, inserts the tool  10  and subsequently again inserts and secures the connection bolt  5 . 
   The tool  10  shown alone in  FIG. 2  comprises two pivot arms  11  which are mounted in a pivotally moveable manner between two mostly T-shaped designed carrier plates  12  in each case by way of a bearing bolt  13 . Accordingly, the two carrier plates  12  which are positioned exactly over one another each comprise a connection bolt hole  14  through which the connection bolt  5  of the receiver  4  is pushed. In the inserted position the pressing rollers  6  of the pressing apparatus  1  come to bear on the running surfaces  15  of the two pivot arms  11  and at the same time drive these outwards in a pivoted manner about the two bearing bolts  13 , wherein simultaneously the front ends of the pivot arms  11  which are shown as clamping arms  16  are moved towards one another. Consequently, the position represented in  FIG. 2  corresponds to the closed position. Usually the fittings to be pressed are larger than the receiver of the clamping pincer arms  16  so that at the beginning of the clamping activity the two pivot arms  11  near which the pressing rollers  6  become active, lie closer to one another than shown in  FIG. 2  and thus need to be pressed apart. 
   Proceeding from these known premises, it is one object of this invention to make available additional tools which may be actuated with the known pressing apparatus and which correspond to these tools with regard to their basic conception. 
   A first embodiment of a tool is shown in the  FIGS. 3-7  which is suitable for cutting to length rod material with an essentially round cross section. The tool which is indicated in its entirety at  10  comprises pivot arms  11  which are pivotally mounted between two T-shaped carrier plates  12  about bearing bolts  13 . Here via the connection bolt hole  14 , the tool  10  may be connected to the receiver  4  by way of the connection bolt  5 . The schematically represented pressing rollers  6  in  FIG. 3  are shown in the initial position, and in  FIG. 4  in the actuated end position. Here two cutting plates  20  and  21  are held between the two front ends of the pivot arms  11 , the so-called clamp arms  16 . Six traversing round holes  22  are formed in each cutting plate  20  or  21 . With this, in each case two similarly large round holes are formed in an overlapping manner. The two diametrically opposed cutting plates  20  and  21  in each case on the one side comprise a carrier hole  23  corresponding to a fastening bolt and on the other side an elongated hole  24  corresponding to the same diameter. 
   The two pivot arms  11  which in the front region are indicated as clamp arms  16  in the preferred embodiment shown here have a fork-like receiver which is formed by a suitable centric milled recess  27 . The width of the milled recess  27  corresponds at least to the thickness of the two shear plates  20  and  21 . A fastening bolt  26  with a suitable head  28  passes through the fork  25  and the two shear plates  20  and  21 . The fastening bolt  26  may be designed as a resilient expansion bolt and thus may be held in the prong of the fork with a positive fit and in the other with a non-positive fit. The fastening bolt  26  in the one plate in each case engages through the carrier hole  23  and in the opposite shear plate through the guiding elongate hole  24 . On actuation of the pressing apparatus  1 , the pressing rollers  6  are pushed forwards, the pivot arms  11  are driven apart and accordingly the clamping arms  16  are moved towards one another, wherein the shear plates  20  and  21  are moved oppositely relative to one another towards one another, wherein the traversing round holes  22  are displaced from their flush position into a position in which the traversing round holes are completely displaced to one another. Accordingly, the rods passing through the traversing round holes which are initially flush are severed in a clean manner. In the embodiment represented here the two shear plates  20  and  21  are simple flat plates. A minimal pivot movement with respect to the fastening bolts  26  at the same time is thus possible. It is however also possible to design the two shear plates  20  and  21  considerably thicker and instead fastening them in a fork-like receiver to fasten them at one side on two pivot arms. With this however for guiding the two cutting plates these have a tongue and groove so that a secure parallel guiding of the two shear plates is achieved. With the preferred embodiment shown here, the two shear plates may be designed thinner and significantly more economically without additional guiding measures being required. 
   The two guiding elongate holes, as shown here, do not need to be open towards the side but may also be holes which are closed per se. Open elongated holes help make the assembly of the exchangeable shear plates  20  and  21  quicker and simpler. 
   In a completely analogous manner, the  FIGS. 8-12  show an embodiment by way of which a particularly common profile may be cut to length. For explaining the manner of acting only the pressing rollers  6  shown previously are omitted. The further elements of the tool, with the exception of the actual shear plates  20  and  21  are identical. Again the tool has suitable pivot arms  11  which are held between two T-shaped carrier plates  12  and are pivotable about bearing bolts  13 . The clamping arms  16  are designed as a fork  25  and the shear plates  20  and  21  in the milled recess  27  are held or guided by fastening bolts  26 . In contrast to the embodiment according to the  FIGS. 3-7  however, the two shear plates  20  and  21  shown in the  FIGS. 11 and 12  have guide-like openings  29  which are suitably formed in the shape of a profile cross section extremely commonplace with plumbing installations. The guide-like openings  29  should at the same time be arranged in the two shear plates so that no wall region of the cross section runs parallel to the actuation direction of the two shear plates. In the example shown here this is also not the case. Accordingly, the travel path with the corresponding shear movement only needs to be relatively small. The two shear plates  20  and  21  have suitable carrier holes  23  and guiding elongated holes  24 . The guiding elongated holes  24  are designed shorter than in the previously shown example, corresponding to the smaller required travel. As one may easily recognize from the examples described here, there is no requirement for different tools  10  for the applications shown here, but only different shear plates. 
   That which has been cited previously in a practically analogous manner also applies to the last embodiment form according to the  FIGS. 13-19 . The basic construction of the tools  10  is identical. These again comprise the pivot arms  11  which in the front region are designed as clamping arms  16  and which again are arranged between two T-shaped carrier plates  12 . The pivot arms  11  are mounted in the two mentioned carrier plates  12  by way of bearing bolts  13 . The shear plates here are designed as a male die  30  and a female die  31 . For guiding the male die  30  and the female die  31 , one would provide suitable guide bolts  32  in one part and in the other part suitable guide bores  33 . As is known from die technology, the male die  30  comprises a punch  34  and the female die  31  a punch receiver  35 . An ejection opening  36  is in the female die  31  behind the punch receiver or punch guide  35 , through which the punched out material may be laterally remove. In the example shown, the female die  31  and the male die  30  are designed so that elongated holes may be punched out. At the same time the female die is designed with a receiver opening  37  so that a profile may be inserted therein which corresponds to that profile which may be introduced by way of the tool, as is shown in  FIGS. 8-12 . 
   The male die and the female die may be designed of one or two parts. Here, shown symbolically is the possibility of a two-part male and female die, wherein basically a female die holder  28  and a male die holder  39  are present which are designed in the two clamping arms in a manner corresponding to the receiver, and wherein the actual female die and male die parts may be fastened in these holder parts  38  and  39 . The described and shown embodiments are not conclusive but only indicate the enormous array of possibilities of differently designed shear plates. With regard to the concept however, the tools  10  would always be standardized so that these always fit the corresponding pressing apparatus  1  and on the other hand one would preferably also design the shear plates  20  and  21  with respect to their receivers in the pivot arms  11  of the tool  10 . Only in this manner may the supplier offer a multitude of application possibilities with relatively little expense.