Metal deforming – With means to drive tool – Including link-actuated tool support
Patent
1993-02-22
1995-06-20
Jones, David
Metal deforming
With means to drive tool
Including link-actuated tool support
72407, 72455, 100228, B21J 918
Patent
active
054252628
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 etc. The tools and machines could be of stationary or hand-held type. The power source could be of any type, hydraulic, pneumatic, electric etc.
BACKGROUND ART
One type of tool belonging to the category defined above is previously known from the International patent application W089/07020.
According to the principle of the tool described in said patent application a pair of overlaying metal sheet members are joined together by lancing and forming a part of one member through an unblanked part of the other member. Thereafter a staking procedure is carried out on the lanced and formed part of the one member to an adjacent surface of the other member to secure the members together in overlaying relation.
Typically this type of tools or machines provide very high forces during the joining procedure, the opening, or gap, for introducing the workpieces is relatively narrow and the strokes carried out by the active machine elements are short and fast.
On one hand a narrow gap and short stroke could be chosen in order to give the tool a fast operation which of course gives a more efficient tool with more joints per unit time. On the other hand the same parameters are of course limiting the form and dimensions of the workpiece which could be operated on by the tool.
If, on the other hand a wider gap and longer stroke are chosen, without any compromise on the time for making a joint, the tool will require a more powerful drive unit. The implementation of this idea thus implies costs at two levels: investment costs for a larger high-power drive installation and higher energy costs for the operation of the tool.
DISCLOSURE OF THE INVENTION
One object of the present invention is to provide a method and a machine for pressing, riveting, clinching, cutting etc. which is fast and efficient and possible to use on workpieces with different geometries and much larger dimensions than heretofore.
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.
The inventive idea takes into consideration the fact that when making one of the above mentioned operations, pressing, clinching, riveting, inserting, cutting 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 active 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:
FIG. 1 schematically shows an apparatus according to the present invention implemented as a hand-held tool,
FIG. 2 shows the same tool positioned for the active part of the stroke,
FIG. 3 shows an implementation of the invention as a stationary machine,
FIG. 4 shows one of the handles on a hand-held tool with an integrated locking mechanism,
FIG. 5 illustrates in perspective the locking mechanism of the handle according to FIG. 4,
FIG. 6 shows a further implementation of a handle of a hand-held tool and
FIGS. 7 to 10 show further embodiments of the locking mechanism.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows schematically an apparatus according to the present invention implemented as a hand-held tool. The principles of the invention are, however, applicable to stationary equipment as well, as will be described below. The tool-body has two main parts 1 and 2 each provided with a handle 3 and 4 respectively and carrying an active part 6, 7. These handles are, in the shown example, arranged with their axes perpendicular to each other. The two parts 1 and 2
REFERENCES:
patent: 1343872 (1920-06-01), Livering
patent: 1354517 (1920-10-01), Sollazzo
patent: 2765019 (1956-10-01), Evans
patent: 3422750 (1969-01-01), Anderson
patent: 3496967 (1970-02-01), Timmerbeil
patent: 4329867 (1982-05-01), Nelson
patent: 4878374 (1989-11-01), Nelson
Attexor Equipements S.A.
Jones David
Stone Mark P.
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