Metal deforming – With means to drive tool – Including pneumatic- or fluid-actuated tool support
Patent
1996-12-03
1998-09-15
Jones, David
Metal deforming
With means to drive tool
Including pneumatic- or fluid-actuated tool support
72444, 7245303, 724528, B21J 918, B21J 1520
Patent
active
058063625
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to apparatuses for carrying out operations on a mechanical workpiece e.g. tools or machines for pressing, riveting, clinching, cutting, welding, spot-welding etc. The tools and machines could be of stationary or hand-held type. The power source could be of any type, hydraulic, pneumatic, electric, of manual type etc.
BACKGROUND ART
One type of tool belonging to the category defined above is previously known from the International patent application W092/18264. This published application is herewith incorporated by reference.
The machine according to the above makes one or several "strokes" towards the workpiece in order to achieve the expected effect. At the end of the active stroke very high forces are typically applied. The opening between the active machine elements, for introducing the workpieces can be decreased in a first part of the stroke before the second active part takes place.
DISCLOSURE OF THE INVENTION
One object of the present invention is to provide a method and a machine for pressing, riveting, clinching, cutting, welding, spot-welding etc. which is fast and efficient and possible to use on work-pieces with different geometries and large dimensions.
Another object of the invention is to provide a tool which meets the requirements according to the above still being so light and compact that it could be used as a versatile hand-held tool.
Another object of the invention is to provide a machine with a very high safety level. It is practically impossible to injure e.g. a hand or finger of the operator or a collaborator during the operation.
The inventive idea takes into consideration the fact that when making one of the above mentioned operations, pressing, clinching, riveting, inserting, cutting, welding etc. the total active force is only needed for a short part of the stroke of the tool. The rest of the stroke is needed for approaching the parts of the tool to the point of operation.
The present invention, which provides a solution to the said technical problems, is characterised according to the appended claims.
BRIEF DESCRIPTION OF THE FIGURES
Other objects, uses and advantages of this invention will be apparent from the reading of this description which proceeds with reference to the accompanying drawings forming part thereof and wherein:
FIGS. 1 to 4 show different phases of the operation of an embodiment of the machine according to the present invention, implemented as a hand-held tool,
FIG. 5 shows more in detail the same machines in the FIGS. 1-4.
FIG. 6 shows a perspective view of a hand held machine according to the invention.
FIG. 7 shows a machine with one activation element and a force transferring element of another type.
FIG. 8 shows another embodiment of the machine according to the invention.
FIG. 9 shows another embodiment of the machine according to the invention.
FIG. 10 shows an embodiment having two activation elements and two force transferring elements.
FIG. 11 shows an embodiment in which two rods forming a knee are used as force transferring elements.
FIGS. 12 and 13 show a side view of the tool according to FIG. 6 in open and closed positions.
FIG. 14 shows an integrated activation and force transferring element.
DETAILED DESCRIPTION OF THE INVENTION
FIGS. 1-4 show schematically an apparatus according to the present invention implemented as a hand-held tool. FIG. 1 shows the starting position by which the mechanical workpieces, not shown, are positioned between the two tool carrying members 1 and 2. FIG. 2 shows the approaching stroke for the two tool carrying members achieved by means of pushing a roller 8, in this case by handforce, into position between the tool carrying member 1 and the active element 11, in the form of a cylinder-piston assembly. The device which is pushed in between the tool carrying member and the active element can have other forms than a cylindrical roller. It can e.g. have the form of a sphere or a cam with only part of the external surface being spherical or cylindrical. As will be desc
REFERENCES:
patent: 5316277 (1994-05-01), Banks
patent: 5425262 (1995-06-01), Dubugnon
Jones David
Stone Mark P.
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