Metal deforming – With means to drive tool – Including pneumatic- or fluid-actuated tool support
Patent
1998-09-25
2000-05-23
Jones, David
Metal deforming
With means to drive tool
Including pneumatic- or fluid-actuated tool support
30180, 29751, B26B 1700
Patent
active
060653264
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND
The invention relates to a manual hydraulic apparatus with a traction/pressure installation, for example, a hole punch apparatus, with a hydraulic piston which can e moved with respect to a cylindrical housing, and with a holding-up part and a fastening installation, for example, for a piercing punch.
Different variants of such manual hydraulic apparatuses are already known. One such manual apparatus cannot only be used as a transportable perforation apparatus, for example, for the punching of holes in metal sheets, it can also, in another variant, be used as a blind riveting apparatus. With regard to the latter possibility, reference is made, for example, to the state of the prior art according to EP B1 62 206.
In the known manual hydraulic apparatuses, the design of the traction/pressure installation is not yet considered to be satisfactory.
The hydraulic piston of the known manual hydraulic apparatus retracts, when pressure is applied, pulling the piercing punch to the apparatus, while the holding-up part remains fixed. Accordingly, the admission of the hydraulic piston must be from the front. Because, in addition, the hydraulic piston is still connected to the fastening installation, only a ring surface of the piston is available for the admission pressure. This surface must have the appropriate area, or a correspondingly high hydraulic pressure must be applied.
SUMMARY
Starting from the state of the art described above, the invention concerns the technical problem of improving and simplifying, to the extent possible, the known manual hydraulic apparatus, particularly with regard to its construction.
This technical problem may be solved by one aspect of the present invention, where it is assumed that the fastening installation is rigidly connected to the cylindrical housing and that the holding-up part can be moved by the hydraulic piston with respect to the fastening installation.
In this context, a rigid connection with the fastening installation of the housing itself is crucial. In any case, the fastening installation is here also directly connected to the fixed cylindrical housing. According to the invention, an exchange is made between the movable and fixed part of the drive installation. It was recognized that, in contrast to the principle used so far in such an apparatus, the holding-up part can be actively moved, that is the manual hydraulic apparatus, when used, can be braced against one of the surfaces of the holding-up part, whereas the fastening installation remains fixed. This exchange between the movable and the fixed part makes it possible to use a considerably simpler construction design. The hydraulic piston, when actuated, can receive the admission pressure from the floor. The entire piston surface can be available for this purpose. Since admission pressure need not be applied to the top of the hydraulic pistons, that is the side pointing in the direction of the holding-up part, the design of the apparatus can, as a result, be much more compact. In an additional advantageous variant, the invention provides for a design of the holding-up part which is essentially in the shape of a circular ring. The fastening installation can, to the extent compatible with the known variant, be in a position which is central with respect to the holding-up part. For this purpose it is particularly preferred that the holding-up part passes through the fastening installation. Thus it is possible, in a simple manner, to apply the admission pressure onto the holding-up part by means of the hydraulic piston in spite of the central arrangement of the fastening installation. In greater detail, the hydraulic piston can, for this purpose, pass through the fastening installation by means of pressure rods, which act on the holding-up part. To hold the holding-up part together with a hydraulic piston, other separate screw connections are listed below. Moreover, it is also possible for the pressure rods, if they are properly designed, to take over the task of fastening the parts to each other. In addi
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Gustav Klauke GmbH
Jones David
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