Metal deforming – With use of control means energized in response to activator... – Sensing tool or tool-linked part
Reexamination Certificate
2000-10-02
2002-10-01
Crane, Daniel C (Department: 3725)
Metal deforming
With use of control means energized in response to activator...
Sensing tool or tool-linked part
C072S030100, C072S409190, C072S416000, C029S708000, C029S720000
Reexamination Certificate
active
06457338
ABSTRACT:
RELATED/PRIORITY APPLICATION(S)
This application claims priority from German Application No. 199 49 703.6, filed on Oct. 15, 1999, and German Application No. 100 10 601.3, filed on Mar. 3, 2000.
The invention relates first of all to a pressing tool with pressing levers which are connected to one another by a connecting link plate such that they can be rotated in a tong-like manner and each of which provides an upper free mouth end, there being provided a monitoring device which only allows an open position of the pressing levers which is suitable for the release of a blank to be achieved if a full pressing action, with a minimum closing position of the pressing levers being achieved in the process, has been carried out beforehand, a mechanical, electronic or electrical sensor being disposed on one of the pressing levers for the purpose of checking the relative positioning of the pressing levers in relation to one another.
Pressing tools of this type are known, radial pressing of blanks, for example sanitary fittings, that is to say the reduction in the tube or sleeve diameter, usually taking place by means of pressing tools with pressing levers and/or pressing jaws which are moved towards one another via cam tracks, located at the end located opposite a pressing jaws, and associated rollers of a conventional pressing machine. The operation of monitoring whether pressing has taken place in full proves problematic in the case of the radial pressing. In order to achieve the desired profile depth, full closure of the pressing jaws is necessary. An incomplete pressing action may have its basis, for example, in the power of the drive being too low. Furthermore, deformations or rupturing of the pressing jaws and/or pressing levers or damage to the pressing tool may result in incomplete closure of the pressing jaws. In this respect, different solutions for monitoring the pressing action which aim for interaction between drive machine and pressing jaws are known. It is thus known, for example, to provide a pressing jaw with a gap sensor which senses the closing position of the pressing jaw on the inner side remote from the mouth end and transmits a corresponding signal to the machine, which reacts suitably. Further solutions operate with a coding of the pressing jaws for example by magnets. In this case, monitoring of the position of the pressing jaw and of the associated end positions of the machine rollers is carried out by the machine, for which purpose it is necessary to have a displacement-measuring mechanism and evaluating logic system in the machine.
In relation to the prior art described above, a technical problem of the invention is seen as the provision of a pressing tool with pressing levers of the type in question which is improved as far as monitoring a full pressing action is concerned.
This problem is solved at least and in essence in the case of the subject matter of claim 1, this being based on the fact that the sensor is disposed in the upper free mouth end of the one pressing lever. As a result of this configuration, the closing position of the pressing lever and/or jaws in the region of the upper, free mouth ends, which are to be moved towards one another, is monitored. The pressing jaws are thus reliably monitored to the effect that they are fully closed towards the end of a pressing action. The sensor provided monitors here the spacing between the two mouth ends and only when a preferably fully closed position of the pressing jaws is achieved, that is to say when the mutually facing surfaces of the upper, free mouth ends, which are substantially the furthest away from the centre of rotation, butt against one another, does it allow an open position of the pressing jaws which is suitable for the release of a blank.
Since the sensor, for sensing the pressing-jaw position, is disposed in the region of the upper, free mouth end of a pressing lever, it is ensured, in contrast to the known solutions, that any rupturing of the pressing levers or pressing jaws in the front region is sensed since, in this case, there is no contact between the front ends, that is to say the upper, free mouth ends. It is preferred that, during a pressing operation, once a predetermined closing angle of the pressing levers in relation to one another has been achieved, opening of said levers for the release of the blank can only take place following full pressing action, that is to say following full closure of the pressing jaws. Accordingly, as from the predetermined closing-angle position, a full pressing action of the blank is absolutely necessary in order for the pressing tool to be removed thereafter. Such a principle is known in manual pressing tools, for example crimping tongs. These can only be opened again once the closed position has been achieved. The blocking mechanism used in these tongs preferably reacts to the angle position of the tool/tong handles. Since use is mostly made of a toggle-lever mechanism, a relatively precise check of the closed tongs is achieved, in this construction, even in the case of a relatively imprecise blocking catch. Since, in the case of the pressing levers which form the basis here, there is no such force enhancement, that is to say a lever advantage by virtue of toggle levers, the blocking mechanism has to be designed very precisely. This is achieved according to the invention by a division of the latching and blocking functions.
The invention also relates to a pressing tool with pressing levers which are connected to one another by a connecting link plate such that they can be rotated in a tong-like manner, with the interposition of a rolling body, and which define a mouth end, there being provided a monitoring device which only allows an open position of the pressing levers which is suitable for the release of a blank to be achieved if a full pressing action, with a minimum closing position of the pressing levers being achieved in the process, has been carried out beforehand, a mechanical release pin being disposed in one of the pressing levers for the purpose of checking the relative positioning of the pressing levers in relation to one another. In order to specify here a pressing tool with pressing levers of the type in question which is formed in improved manner as far as the monitoring of a full pressing action is concerned, it is proposed that the release pin interacts with a blocking slide which has a blocking pin, which blocking pin, if the pressing action is incomplete, prevents an opening movement of the pressing levers about the rolling body. As a result of this configuration, there is a mechanical locking if the minimum closing position of the pressing levers is not achieved. The sensor, which is disposed in the upper, free mouth of the one pressing lever, causes displacement of the blocking pin into the blocking position and securing of the blocking pin in this blocking position. The latter can be achieved, for example, in that the blocking pin engages in a recess of a tool which is secured in relation to the pressing lever or moves against the rolling body in the course of an attempted opening pivoting movement of the pressing lever.
The invention also relates to a pressing tool with pressing levers which are connected to one another by a connecting link plate such that they can be rotated in a tong-like manner and which define a -mouth end, there being provided a monitoring device which only allows an open position of the pressing levers which is suitable for the release of a blank to be achieved if a full pressing action, with a minimum closing position of the pressing levers being achieved in the process, has been carried out beforehand, a mechanical sensor being disposed in one of the pressing levers for the purpose of checking the relative position of the pressing levers in relation to one another, the mechanical sensor, in the case of incorrect closure of the pressing levers, triggering a mechanical locking mechanism in the region of the connecting link plate. In order to provide here a pressing tool with pressing levers of the ty
Crane Daniel C
Gustav Klauke GmbH
Trexler, Bushnell Giangiorgi, Blackstone & Marr, Ltd.
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