Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1996-12-24
1998-12-22
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
26417111, 26421121, 425114, 425135, 425162, B29C 4702, B29C 4792
Patent
active
058514554
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a process and device for the serial assembly of extrudates with securing elements or the like.
The following procedure was customary until now in order to equip an extrudate with securing elements: After extrusion, the extrudate was drilled or punched in a separate device in order to provide corresponding receiving possibilities for the securing element or the like. Then the securing elements that were to be attached and that were present in a loose fashion were manually (or also by machine) moved into the corresponding position on the extrudate.
The working steps involving drilling or punching as well as the subsequent manual assembly of the extrudate with the securing elements or the like (possibly also with the help of machines) are very time-consuming and cost-intensive.
Therefore, the object of the invention is to develop a process and a device that will permit time-saving and cost-effective procedures for the assembly of extrudates with securing elements or the like.
SUMMARY OF THE INVENTION
This problem is solved according to the invention in that the securing elements or the like are fed during the extrusion process to the extrusion tool. They are then inserted in the latter and anchored in the extrudate by the resulting extrusion.
Thus, expensive drilling or punching to make openings for fitting the securing elements can be eliminated, because according to the invention the securing elements or the like are already incorporated in the material during the process of producing the extrudates. It was furthermore found that the elements incorporated in the extrudate, according to the process involved in the invention, have a comparatively solid seat. Undesirable twisting or shifting of the securing elements can no longer be observed.
The securing elements can be worked into the extrudate either loosely as individual elements or in a manner connected to each other.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1a and 1b are front views of the securing elements in extrudates.
FIG. 2 is a front perspective of the system of the invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIGS. 1a and 1b show different embodiments of the securing elements in extrudates, as discussed below.
The procedure takes place in a corresponding device (FIG. 2) in such a manner that via a conveyor and sorting system (2), the loose elements (7) to be secured are individually fed to the extrusion tool (1) or to the injection head. Prior to the exit of the elements out of this system (positioning), they remain in a set position. The flow path of extrudate (6), which is acquired by a special distance measurement system (5), makes it possible (in case of a corresponding imaging of the flow path), in response to an electrical signal, to have the latter acting as an input signal of a control unit and trigger a feeder unit (3a). The latter clocks the securing element or the like in such a manner that it is supplied out of its set position to the material stream (extrudate) whenever the corresponding interval to the predecessor has been reached. In the process, the securing element (7) or the like establishes a firm connection with the extrudate. Positioning the securing elements or the like in the extrudate during extrusion and specifically in the extrusion tool or the injection head offers the following critical advantages: help of an electrical control unit comprising a distance measurement system and setting unit; fact that the securing element or the like can have extrudate injected around it or over it up to its functional range or it may be immersed;
In hollow chamber extrudates, it is further possible to prevent a functional restriction in that the head of the securing element is arranged inside the extrudate wall (FIGS. 1a and 1b) and that, because of this all-around injection, one needs a comparatively small back-hooking surface on the securing element or the like, as one can see in FIGS. 1a and 1b for a selected securing element.
An exemplary embodiment will
REFERENCES:
patent: 2575138 (1951-11-01), Slaughter
patent: 2599493 (1952-06-01), Slaughter
patent: 2962813 (1960-12-01), Kreidler
patent: 3826285 (1974-07-01), Reynolds
patent: 3981452 (1976-09-01), Eckstein
patent: 5022940 (1991-06-01), Mehoudar
Kotz Stefan
Sehr Ralf
Creighton Wray James
Narasimhan Meera P.
Saar-Gummiwerk GmbH
Vargot Mathieu D.
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