Electric heating – Metal heating – For bonding with pressure
Patent
1999-05-19
2000-07-11
Ryan, Patrick
Electric heating
Metal heating
For bonding with pressure
219 8621, B23K 932, B23K 306
Patent
active
060876115
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to the field of assembly lines, particularly for automotive vehicles. In such lines, there are used numerous manually controlled tools supplied with electricity and/or fluid. An example of such a tool is a welding tong station which comprises, in addition to the welding tong itself, various other components such as a programmable welding control, a welding transformer, a static contactor with thyristors, etc.
BACKGROUND OF THE INVENTION
Until now, to permit movement of a welding tong necessary for the production process, it was usual to suspend said welding tong and its accessories from rolling rails, which are fixed to the framework of the assembly plants by removable sub-frames. Such an installation requires connection to the ground of the welding tong, by means of a connection foot, and an associated detection system.
The assembly of the sub-frame bearing the rolling rails must be constructed as a function of the assembly line in question, such that dismantling is necessary for installing a new line with its specific rail system. These operations are long and costly, the structure constituted by the subframe and the rolling rails being itself difficult to design, produce and assemble.
A modification of the assembly line is extremely difficult and costly.
Another drawback of the known system which has been described resides in the great difficulty of reusing in a new line the material thus installed, because of the specific definition of the suspended working station.
Repairs and exchanges of components are also difficult because of the suspension of a working unit which must accordingly be as integrated as possible.
There are also known several devices for suspension of manually controlled tools.
Thus, from JP-A-59037006, there is known a work station for a piercing tool in which said tool is carried by a suspended mast with a bracket along which said mast is displaceable. This bracket is moreover connected to one end of a support resting on the ground and about which it is movably driveable.
Such a device requires in the first instance a counterweight on the mast itself so as to counterbalance the weight of the piercing tool and then requires perfect securement of the central support carrying the bracket. Thus, when said mast is brought to the end of the bracket, this can generate a twisting force on the central support which has to be countered by good securement. Once the piercing tool has been brought adjacent the object to be pierced, as recognized by an electromagnetic magnet, this piercing tool is correctly positioned. This positioning takes place manually by manipulation of handles suitable to displace said tool forwardly and rearwardly, up and down and from left to right.
The tool in question being a piercing tool, it is necessary to obtain precise positioning of said tool. However, in the case of the welding tong, it is on the contrary important to provide complete freedom of manipulation in movement of said tool by the user and such a device therefore cannot be used in a welding station.
There is also known, from U.S. Pat. No. 4,969,625, a device for manually controlled tools, in particularly a fastening device in which there is provided a drive means for moving said tool back and forth, laterally, forwardly and rearwardly and vertically, as well as for driving it in rotation. These means are provided on a longitudinal axle whose one end is secured on a vertical mast having a positioning plate and whose other end carries the tool. The device also comprises torsion reaction means and means for securing the mast in a working plane. However, this device has a particularly complicated and rigid structure which also does not give complete freedom of manipulation and movement for the user.
The device described in U.S. Pat. No. 3,608,578 also relates to a device for manual tools in which a mast is mounted on a workbench and comprises a support. This support comprises a transport mechanism which moves along the latter and which carries a balancing device having a cabl
REFERENCES:
patent: 4349718 (1982-09-01), Carota et al.
patent: 4663510 (1987-05-01), Ritter
patent: 4771160 (1988-09-01), Pitsch et al.
patent: 5739499 (1998-04-01), Suzio et al.
Beffrieu Michel
De Bruyn Gerard
Beffrieu Michel
Dawidowicz Armand
Dey Anjan
Menage Christine
Ryan Patrick
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